Cover plate assembly and single battery comprising same

Abstract

The utility model provides a cover plate assembly and a single battery comprising the same. The cover plate assembly comprises a cover plate body, wherein a through liquid injection hole is formed in the thickness direction of the cover plate body; the insulating part comprises an insulating main body and a convex part which is arranged on one side, facing the cover plate body, of the insulating main body, a through liquid guide through hole is formed in the convex part in the thickness direction, and the liquid guide through hole corresponds to the liquid injection hole so as to form a first channel communicated with the liquid injection hole; a second channel communicated with the first channel is further formed in the insulating part, a first end opening of the second channel is formed in the side face of the protruding part, and a second end opening of the second channel is formed in the insulating body. By arranging the second channel communicated with the first channel, the electrolyte can flow into the single battery through the liquid outlets of different channels, so that the liquid injection process is accelerated.

Description

Technical Field

[0001] The utility model relates to a cover plate assembly and a single battery comprising the cover plate assembly. Background Art

[0002] The existing battery cover assembly includes a cover body and an insulating member covering the side of the cover body facing the electrode assembly (battery cell) located inside the battery. The insulating member generally abuts against the electrode assembly, causing the electrolyte injection process to be slow when the battery cell is injected, and the time it takes to flow to the large surface of the electrode assembly is prolonged. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defect of slow liquid injection process inside the battery core in the prior art, and to provide a cover plate assembly and a single battery containing the same.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] A cover plate assembly, characterized in that it comprises:

[0006] A cover plate body, with a penetrating liquid injection hole opened along the thickness direction of the cover plate body;

[0007] An insulating member, comprising an insulating body and a convex portion arranged on a side of the insulating body facing the cover body, the convex portion having a liquid conducting through hole extending therethrough along the thickness direction, the liquid conducting through hole being arranged corresponding to the liquid injection hole to form a first channel communicating with the liquid injection hole;

[0008] The insulating member is further formed with a second channel communicating with the first channel, a first end opening of the second channel is opened on a side surface of the convex portion, and a second end opening of the second channel is opened on the insulating body.

[0009] In the present technical solution, a second channel connected to the first channel is provided, and a first end opening of the second channel is opened on the side of the convex portion, and a second end opening of the second channel is opened on the insulating body, so that the electrolyte can flow into the interior of the single cell through the liquid outlet openings of different channels, thereby speeding up the liquid injection process.

[0010] Preferably, the insulating body comprises a bottom wall and a side wall, one end of the side wall is connected to the bottom wall, and the other end extends toward the cover body;

[0011] The convex portion is arranged on a side of the bottom wall facing the cover plate body, and the bottom wall and the side wall are arranged to form a flow cavity, and the flow cavity is used to connect the first end opening and the second end opening.

[0012] In the technical solution, by setting the specific structure of the insulating body, a flow cavity is formed on one side of the insulating body facing the cover body, thereby forming a channel connecting the first end opening and the second end opening.

[0013] Preferably, the second end opening is provided on the side wall and / or the bottom wall.

[0014] In the technical solution, the above arrangement provides a specific location for the second end opening. Compared with the second end opening being arranged on the bottom wall, the second end opening being arranged on the side wall can avoid the contact surface between the bottom wall and the electrode assembly being an uneven surface of the opening, and can avoid the opening having adverse effects on the electrode assembly.

[0015] Preferably, the side wall comprises: a first side wall and a second side wall respectively arranged on both sides of the bottom wall along the width direction of the cover plate assembly;

[0016] The second end opening includes at least one of a first opening and a second opening, wherein the first opening is an opening opened on the first side wall, and the second opening is an opening opened on the second side wall.

[0017] In the present technical solution, by limiting the second end opening to be opened on the first side wall or the second side wall on both sides of the bottom wall along the width direction of the cover plate assembly, it is possible to ensure that the contact surface between the bottom wall and the electrode assembly is flat, and the opening can be prevented from having adverse effects on the electrode assembly; further, by limiting the second end opening to be opened on the first side wall and the second side wall at the same time, the position for the electrolyte to flow into the interior of the single cell can be increased in multiple directions.

[0018] Preferably, the first opening comprises a plurality of first opening portions arranged at intervals; and / or,

[0019] The second opening includes a plurality of second opening portions that are spaced apart from each other.

[0020] In the technical solution, the above arrangement provides more openings for the electrolyte to flow into the interior of the single battery.

[0021] Preferably, the plurality of first openings are symmetrically arranged with respect to the plurality of second openings along the width direction.

[0022] In the present technical solution, by arranging the multiple first openings symmetrically with the multiple second openings along the width direction, it is possible to ensure that the amount of electrolyte flowing from the first side wall and the second side wall into the interior of the single cell is uniform, so that the electrolyte is more evenly distributed inside the single cell; and it is possible to ensure that the electrolyte flows from the first side wall and the second side wall into the interior of the single cell at the same flow rate, thereby improving the liquid inlet efficiency.

[0023] Preferably, the cover plate assembly further comprises:

[0024] An electrode lead-out member is sequentially provided through the first electrode lead-out hole on the insulating body and the second electrode lead-out hole on the cover body;

[0025] An explosion-proof component, an exhaust hole provided on the cover body, and an exhaust area provided on the insulating body at a position opposite to the exhaust hole along the thickness direction;

[0026] Wherein, the insulating body is provided with a liquid injection area between the first electrode lead-out hole and the exhaust area, and the projection of the liquid injection hole along the thickness direction is located in the liquid injection area;

[0027] The first opening of the second channel is located in the liquid injection area, and / or the second opening of the second channel is located in the liquid injection area.

[0028] In the technical solution, by arranging the first opening in the injection area, the first opening is closer to the injection hole, thereby shortening the flow path between the first end opening and the second end opening. By arranging the second opening in the injection area, the second opening is closer to the injection hole, thereby shortening the flow path between the first end opening and the second end opening.

[0029] Preferably, a side of the exhaust area away from the cover plate is a first plane, a side of the injection area away from the cover plate body is a second plane, and the first plane and the second plane are located in the same plane.

[0030] In the present technical solution, by setting the first plane and the second plane in the same plane, it is possible to ensure that the contact surface between the insulating body and the electrode assembly is a flat surface, thereby preventing the protrusions on the insulating body from piercing the electrode assembly and causing adverse effects such as short circuits.

[0031] Preferably, the exhaust area and the liquid injection area are integrally formed.

[0032] In the technical solution, the exhaust area and the liquid injection area are integrally formed to improve the overall strength of the insulation body.

[0033] Preferably, the insulating body further comprises an electrode area where the first electrode lead-out hole is arranged, and a recessed portion for accommodating the electrode lead-out member is formed on a side of the electrode area away from the cover body;

[0034] Along the thickness direction, a height difference between an end surface of the electrode lead-out member and the second plane is less than or equal to 0.5 mm, wherein the end surface of the electrode lead-out member is an end surface of the electrode lead-out member away from the cover plate body.

[0035] In the present technical solution, by setting a range of values ​​for the height difference between the end face of the electrode lead-out piece and the second plane, it is possible to ensure that the contact surface between the insulating body and the electrode assembly is basically a flat surface, thereby preventing the transition steps on different surfaces from piercing the electrode assembly and causing a short circuit, thereby producing adverse effects.

[0036] Preferably, the end surface of the electrode lead-out member and the second plane are located in the same plane.

[0037] In the present technical solution, by arranging the end face of the electrode lead-out piece and the second plane to be located in the same plane, it is possible to ensure that the contact surface between the insulating body and the electrode assembly is a flat surface, thereby avoiding the opening from having a negative impact on the electrode assembly.

[0038] Preferably, the exhaust area is further provided with a reinforcing rib, and the reinforcing rib is arranged on the bottom wall, and the height of the reinforcing rib is less than or equal to the height of the higher side wall between the first side wall and the second side wall.

[0039] In the present technical solution, by arranging reinforcing ribs in the exhaust area, the overall structural strength of the exhaust area of ​​the insulating body can be strengthened; further, by arranging the height of the reinforcing ribs to be less than or equal to the height of the higher side wall between the first side wall and the second side wall, it is possible to avoid the reinforcing ribs interfering with the assembly between the insulating body and the cover plate body.

[0040] Preferably, the reinforcing rib is connected between the first side wall and the second side wall;

[0041] The first side wall and the second side wall are respectively in contact with the cover body;

[0042] There is a gap between the reinforcing rib and the cover plate body.

[0043] In the technical solution, a specific arrangement method of the reinforcing ribs is provided through the above arrangement.

[0044] Preferably, the area of ​​the first opening is 10%-90% of the area of ​​the first side wall located in the liquid injection area; and / or the area of ​​the second opening is 10%-90% of the area of ​​the second side wall located in the liquid injection area.

[0045] In the technical solution, by limiting the value range of the area of ​​the first opening, more electrolyte can flow into the interior of the single cell while ensuring the support strength of the first side wall of the insulating member to the maximum extent, thereby completing the injection process more quickly. By limiting the value range of the area of ​​the second opening, more electrolyte can flow into the interior of the single cell while ensuring the support strength of the second side wall of the insulating member to the maximum extent, thereby completing the injection process more quickly.

[0046] Preferably, a hot-melt zone for connecting to the covering insulating member is provided on the outer surface of the side wall, and the second end opening of the second channel is spaced apart from the hot-melt zone.

[0047] In the technical solution, by arranging the second end opening of the second channel apart from the hot melting zone, it is possible to avoid the second end opening interfering with the connection of the sheathed insulating member.

[0048] Preferably, the number of the first end openings of the second channel is plural, and the openings are arranged on the convex portion at intervals along the circumferential direction of the liquid-conducting through hole.

[0049] In the present technical solution, by providing multiple first end openings, more openings for electrolyte to flow into the second channel can be provided; further, multiple first end openings are arranged on the convex portion at intervals along the circumference of the liquid guiding through hole, which can enable the electrolyte to enter the second channel more evenly.

[0050] Preferably, the first end opening of the second channel is a groove or a through hole; and / or, the second end opening of the second channel is a groove or a through hole.

[0051] In the technical solution, through the above-mentioned configuration, a specific configuration method of the first end opening and the second end opening is provided.

[0052] Preferably, the projection of the liquid injection hole along the thickness direction is located within the outer periphery of the liquid guiding through hole.

[0053] In the present technical solution, the projection of the injection hole in the thickness direction is arranged to be located within the outer periphery of the liquid guiding through hole, so that the electrolyte flowing in through the injection hole can all enter the liquid guiding through hole and flow into the interior of the single cell according to the preset channel, that is, the electrolyte can flow into the interior of the single cell through the liquid outlet openings located at different positions of different preset channels, thereby speeding up the injection process and reducing the risk of the loose diaphragm blocking the injection hole in reverse.

[0054] Preferably, the insulating body includes a first part and a second part connected along the length direction, the first part and the second part each include a main body and a connecting portion, the main body of the first part and the main body of the second part are respectively provided with a first electrode lead-out hole, and the electrode lead-out piece is passed through the first electrode lead-out hole; the connecting portion of the first part and the connecting portion of the second part are connected and overlapped along the thickness direction.

[0055] In the present technical solution, by providing an insulating body including a first part and a second part connected along a length direction, as well as a specific structure and a connection method of the first part and the second part, the assembly and disassembly of the insulating body can be facilitated.

[0056] Preferably, a side of the main body of the first part away from the cover body is the first side, a side of the main body of the second part away from the cover body is the second side, the first side and the second side are both flat surfaces and are located in the same plane; a side of the connecting portion of the first part away from the cover body is the third side, a side of the connecting portion of the second part away from the cover body is the fourth side, and the third side and the fourth side are both recessed in the plane where the first side and the second side are located in a direction close to the cover body.

[0057] In the present technical solution, by setting the first side and the second side to be a flat surface and located in the same plane, it is possible to ensure that the contact surface between the insulating body and the electrode assembly is a flat surface, and the opening can be prevented from having an adverse effect on the electrode assembly; further, by setting the third side and the fourth side to be recessed in the plane where the first side and the second side are located in the direction close to the cover body, it is possible to prevent the third side and the fourth side from affecting the contact surface between the insulating body and the electrode assembly to be a flat surface.

[0058] Preferably, the insulating member also includes a snap-on assembly, which includes a first snap-on member and a second snap-on member that snap-fit ​​together, wherein the first snap-on member is arranged on the connecting portion of the first part, and the second snap-on member is arranged on the connecting portion of the second part corresponding to the first snap-on member, and a side of the snap-on assembly away from the cover body is recessed in a plane where the first side and the second side are located in a direction close to the cover body.

[0059] In the present technical solution, by setting up a snap assembly, a specific connection method between the first part and the second part is provided, which facilitates the manufacture and assembly of the first part and the second part; by setting the side of the snap assembly away from the cover body to be recessed in the plane where the first side and the second side are located in the direction close to the cover body, it can be avoided that the snap pierces the electrode assembly, thereby causing adverse effects such as short circuit.

[0060] A single cell battery, characterized in that it comprises:

[0061] case;

[0062] The cover plate assembly as described above, the cover plate assembly is disposed on the shell, and defines a receiving cavity together with the shell;

[0063] The electrode assembly is accommodated in the accommodation cavity.

[0064] The positive and progressive effects of the utility model are:

[0065] The utility model sets a specific structure of the insulating member, sets a second channel connected to the first channel, and the first end opening of the second channel is opened on the side of the convex portion, and the second end opening of the second channel is opened on the insulating body, so that the electrolyte can flow into the interior of the single battery through the liquid outlet openings located at different positions of different channels, thereby accelerating the liquid injection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 The figure is a schematic diagram of a three-dimensional exploded structure of a single cell according to a preferred embodiment of the utility model.

[0067] Figure 2 The figure is a three-dimensional structural schematic diagram of a cover plate assembly and an electrode assembly according to a preferred embodiment of the utility model.

[0068] Figure 3 The figure is a three-dimensional structural schematic diagram of a cover plate assembly according to a preferred embodiment of the utility model.

[0069] Figure 4 for Figure 3 A partial enlarged structural diagram of part A.

[0070] Figure 5 It is a three-dimensional structural schematic diagram of a cover plate assembly from another angle of a preferred embodiment of the utility model.

[0071] Figure 6 The present invention is a three-dimensional structural schematic diagram of an insulating body and an electrode lead-out member of a cover assembly according to a preferred embodiment of the present invention.

[0072] Figure 7 The figure is a schematic cross-sectional structural diagram of a cover plate assembly according to a preferred embodiment of the utility model.

[0073] Figure 8 for Figure 7 A partial enlarged structural diagram of part B.

[0074] Fig. 9 for Figure 7 A partial enlarged structural diagram of part C in the middle.

[0075] Fig.10 It is a partial three-dimensional structural schematic diagram of the insulating body of a cover assembly according to a preferred embodiment of the utility model.

[0076] Fig.11 for Fig.12 A partial enlarged structural diagram of part D in the middle.

[0077] Fig.12 It is a partial three-dimensional structural schematic diagram of the insulating body of the cover assembly of a preferred embodiment of the utility model from another angle.

[0078] Fig.13 It is a partial front structural schematic diagram of the insulating body of a cover assembly of a preferred embodiment of the utility model.

[0079] Fig.14 It is a schematic diagram of the three-dimensional structure of the insulating body of the cover assembly of another implementation manner of a preferred embodiment of the utility model.

[0080] Description of Reference Numerals

[0081] Single battery 1

[0082] Cover assembly 2

[0083] Cover body 10

[0084] Injection hole 11

[0085] Insulation 20

[0086] Insulation body 21

[0087] Flow chamber 210

[0088] Bottom wall 211

[0089] Side wall 212

[0090] First side wall 2121

[0091] Second side wall 2122

[0092] First electrode lead-out hole 213

[0093] Exhaust area 214

[0094] First plane 2141

[0095] Reinforcement 2142

[0096] Injection area 215

[0097] Second Plane 2151

[0098] Electrode area 216

[0099] Depression 2161

[0100] Part 1217

[0101] The main body of the first part 2171

[0102] First side 21711

[0103] The first part of the connection 2172

[0104] Third side 21721

[0105] Part 2218

[0106] The main body of the second part 2181

[0107] Second side 21811

[0108] The second part of the connection 2182

[0109] Fourth side 21821

[0110] Projection 22

[0111] Liquid conducting hole 221

[0112] First channel 23

[0113] Second channel 24

[0114] First end opening 241

[0115] The second end opening 242

[0116] First opening 2421

[0117] Second opening 2422

[0118] Buckle assembly 25

[0119] First buckle 251

[0120] Second buckle 252

[0121] Electrode lead 30

[0122] Electrode lead end face 31

[0123] Explosion-proof components 40

[0124] Shell 3

[0125] Electrode assembly 4 DETAILED DESCRIPTION

[0126] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0127] like Figure 1 As shown, this embodiment provides a cap plate assembly 2 and a single cell 1 including the same. The single cell 1 includes: a housing 3, a cap plate assembly 2 and an electrode assembly 4.

[0128] The cover plate assembly 2 is disposed on the housing 3 and defines a receiving cavity together with the housing 3. The electrode assembly 4 is received in the receiving cavity.

[0129] like Figures 2 to 14 As shown, the cover assembly 2 includes a cover body 10 and an insulating member 20 .

[0130] The cover body 10 is provided with a liquid injection hole 11 penetrating along the thickness direction T of the cover body 10 .

[0131] The insulating member 20 includes an insulating body 21 and a protrusion 22 arranged on the side of the insulating body 21 facing the cover body 10. The protrusion 22 is provided with a liquid conducting through hole 221 along the thickness direction T. The liquid conducting through hole 221 is arranged corresponding to the liquid injection hole 11 to form a first channel 23 connected to the liquid injection hole 11.

[0132] The insulating member 20 further forms a second channel 24 communicating with the first channel 23 . A first end opening 241 of the second channel 24 is opened on a side surface of the protrusion 22 , and a second end opening 242 of the second channel 24 is opened on the insulating body 21 .

[0133] In this way, by providing a second channel 24 connected to the first channel 23, and the first end opening 241 of the second channel 24 is opened on the side of the protrusion 22, and the second end opening 242 of the second channel 24 is opened on the insulating body 21, the electrolyte can flow into the interior (accommodation cavity) of the single battery 1 through different channel outlet openings, thereby speeding up the injection process.

[0134] In addition, the prior art also has a negative pressure pumping process inside the battery during the liquid injection process. Because the diaphragm after hot pressing is loose, there is a risk that the loose diaphragm will reversely block the liquid injection hole during the negative pressure pumping process, causing the battery to fail to pump negative pressure and fail to meet the requirements of the battery production process. In this embodiment, since the second end opening 242 is provided to open the second channel 24 located on the insulating body 21, the risk of the loose diaphragm reversely blocking the liquid injection hole 11 is also reduced.

[0135] Specifically, the insulating body 21 includes a bottom wall 211 and a side wall 212. One end of the side wall 212 is connected to the bottom wall 211, and the other end extends toward the cover body 10. The protrusion 22 is arranged on the side of the bottom wall 211 facing the cover body 10. The bottom wall 211 and the side wall 212 are arranged to form a flow cavity 210. The flow cavity 210 is used to connect the first end opening 241 and the second end opening 242. In this way, by setting the specific structure of the insulating body 21, the flow cavity 210 is formed on the side of the insulating body 21 facing the cover body 10, thereby forming a channel connecting the first end opening 241 and the second end opening 242. It should be noted that in Fig.11 The electrolyte flows into the interior of the single battery 1 along the second channel 24 (in the direction of the hollow arrow), that is, the electrolyte flows into the interior of the single battery 1 through the first end opening 241 , the flow cavity 210 and the second end opening 242 in sequence.

[0136] In this embodiment, the second end opening 242 is provided on the side wall 212. However, it is not limited thereto. In other embodiments, the second end opening 242 may also be provided on the bottom wall 211, or the second end opening 242 may be provided on the side wall 212 and the bottom wall 211. Compared with the second end opening 242 being provided on the bottom wall 211, the second end opening 242 being provided on the side wall 212 can avoid the contact surface between the bottom wall 211 and the electrode assembly 4 being an uneven surface of the opening, and can avoid the opening from having a negative effect on the electrode assembly 4.

[0137] Further, the side wall 212 includes: a first side wall 2121 and a second side wall 2122 respectively arranged on both sides of the bottom wall 211 along the width direction W of the cover plate assembly 2. The second end opening 242 includes a first opening 2421 and a second opening 2422, the first opening 2421 is an opening opened on the first side wall 2121, and the second opening 2422 is an opening opened on the second side wall 2122. However, it is not limited thereto, in other embodiments, the second end opening 242 may include only the first opening 2421, or only the second opening 2422.

[0138] In this way, by limiting the second end opening 242 to be opened on the first side wall 2121 or the second side wall 2122 on both sides of the bottom wall 211 along the width direction W of the cover plate assembly 2, it can be ensured that the contact surface between the bottom wall 211 and the electrode assembly 4 is flat, and the opening can be prevented from having an adverse effect on the electrode assembly; further, by limiting the second end opening 242 to be opened on both the first side wall 2121 and the second side wall 2122 at the same time, the position for the electrolyte to flow into the interior of the single battery can be increased in multiple directions.

[0139] The first opening 2421 includes a plurality of first openings disposed at intervals; the second opening 2422 includes a plurality of second openings disposed at intervals. In this embodiment, specifically, the first opening 2421 includes two first openings disposed at intervals; the second opening 2422 includes three second openings disposed at intervals. In other embodiments, the number of first openings may also be three, four, or other values; similarly, the number of second openings may also be two, four, or other values. In this way, by providing a plurality of first openings disposed at intervals and a plurality of second openings disposed at intervals, more openings are provided for the electrolyte to flow into the interior of the single cell 1.

[0140] In this embodiment, the two first openings on the first side wall 2121 are staggered with the three first openings on the second side wall 2122 along the width direction W. However, it is not limited thereto. In other embodiments, the plurality of first openings may be symmetrically arranged with the plurality of second openings along the width direction W. In this way, by symmetrically arranging the plurality of first openings with the plurality of second openings along the width direction W, it is possible to ensure that the amount of electrolyte flowing from the first side wall 2121 and the second side wall 2122 into the interior of the single cell 1 is uniform, so that the electrolyte is more evenly distributed inside the single cell 1; and it is possible to ensure that the electrolyte flows from the first side wall 2121 and the second side wall 2122 into the interior of the single cell 1 at the same flow rate, thereby improving the liquid inlet efficiency.

[0141] The cover plate assembly 2 further includes: an electrode lead-out member 30 and an explosion-proof assembly 40. The electrode lead-out member 30 is sequentially inserted through the first electrode lead-out hole 213 on the insulating body 21 and the second electrode lead-out hole on the cover plate body 10. The explosion-proof assembly 40 is arranged at the exhaust hole on the cover plate body 10, and the insulating body 21 is provided with an exhaust area 214 at a position opposite to the exhaust hole along the thickness direction T. Among them, the insulating body 21 is provided with a liquid injection area 215 between the first electrode lead-out hole 213 and the exhaust area 214, and the projection of the liquid injection hole 11 along the thickness direction T is located in the liquid injection area 215.

[0142] In this embodiment, the first opening 2421 and the second opening 2422 of the second channel 24 are both located in the liquid injection area 215, so that the first opening 2421 and the second opening 2422 are closer to the liquid injection hole 11, thereby shortening the flow path between the first end opening 241 and the second end opening 242. However, it is not limited thereto, in other embodiments, the first opening 2421 of the second channel 24 may be located in the liquid injection area 215, and the second opening 2422 may be located in other areas, such as the exhaust area 214; or the second opening 2422 of the second channel 24 may be located in the liquid injection area 215, and the first opening 2421 may be located in other areas.

[0143] In this embodiment, the side of the exhaust area 214 away from the cover plate is a first plane 2141, the side of the injection area 215 away from the cover plate body 10 is a second plane 2151, and the first plane 2141 and the second plane 2151 are located in the same plane. In this way, by setting the first plane 2141 and the second plane 2151 in the same plane, it is possible to ensure that the contact surface between the insulating body 21 and the electrode assembly 4 is a flat surface, which can prevent the protrusion on the insulating body 21 from piercing the electrode assembly 4, thereby causing adverse effects such as short circuits.

[0144] Preferably, the exhaust area 214 and the liquid injection area 215 are integrally formed to improve the overall strength of the insulation body 21 .

[0145] The insulating body 21 also includes an electrode area 216 in which a first electrode lead-out hole 213 is provided. A recessed portion 2161 for accommodating the electrode lead-out member 30 is provided on one side of the electrode area 216 away from the cover body 10. Along the thickness direction T, the height difference between the end face 31 of the electrode lead-out member and the second plane 2151 is less than or equal to 0.5 mm, for example, it can be 0.5 mm, 0.4 mm, 0.3 mm, 0.2 mm, 0.1 mm, 0.6 mm, 0.8 mm, 0.9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 210 mm, 220 mm, 230 mm, 240 mm, 250 mm, 260 mm, 270 mm, 280 mm, 290 mm, 310 mm, 320 mm, 330 mm, 340 mm, 350 mm, 360 mm, 370 mm, 380 mm, 390 mm, 400 mm, 410 mm, 420 mm, 430 mm, 440 mm, 450 mm, 460 mm, 470 mm, 480 mm, 490 mm, 500 mm, 510 mm, 520 mm, 530 mm, 540 mm, 550 mm, 560 mm, 570 mm, 580 mm, 590 mm, 61 It should be noted that the height difference between the electrode lead-out member end surface 31 and the second plane 2151 refers to the size difference between the electrode lead-out member end surface 31 and the second plane 2151 along the thickness direction T.

[0146] Please refer to Figure 5 In this embodiment, the electrode lead-out member end surface 31 and the second plane 2151 are located in the same plane. Thus, by arranging the electrode lead-out member end surface 31 and the second plane 2151 to be located in the same plane, it is possible to ensure that the contact surface between the insulating body 21 and the electrode assembly 4 is a flat surface, and it is possible to avoid the opening from having a negative impact on the electrode assembly 4.

[0147] The exhaust area 214 is further provided with a reinforcing rib 2142, which is provided on the bottom wall 211, and the height of the reinforcing rib 2142 is less than or equal to the height of the higher side wall of the first side wall 2121 and the second side wall 2122. In this way, by providing the reinforcing rib 2142 in the exhaust area 214, the overall structural strength of the exhaust area 214 of the insulating body 21 can be enhanced; further, by providing the height of the reinforcing rib 2142 less than or equal to the height of the higher side wall of the first side wall 2121 and the second side wall 2122, the reinforcing rib 2142 can be prevented from interfering with the assembly between the insulating body 21 and the cover body 10.

[0148] Preferably, the reinforcing rib 2142 is connected between the first side wall 2121 and the second side wall 2122, which can improve the structural strength of the insulating body 21 in the width direction W. The first side wall 2121 and the second side wall 2122 are respectively in contact with the cover body 10; there is a gap between the reinforcing rib 2142 and the cover body 10, so as not to affect the assembly between the insulating body 21 and the cover body 10.

[0149] Preferably, the area of ​​the first opening 2421 is 10%-90% of the area of ​​the first side wall 2121 located in the injection area 215, for example, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%; and / or, the area of ​​the second opening 2422 is 10%-90% of the area of ​​the second side wall 2122 located in the injection area 215, for example, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%. In this way, by limiting the value range of the area of ​​the first opening 2421, more electrolyte can flow into the interior of the single battery 1 while maximally ensuring the supporting strength of the first side wall 2121 of the insulating member 20, so as to complete the injection process faster. By limiting the value range of the area of ​​the second opening 2422 , more electrolyte can flow into the single battery 1 at the same time while ensuring the supporting strength of the second side wall 2122 of the insulating member 20 to the maximum extent, thereby completing the injection process more quickly.

[0150] The outer surface of the side wall 212 is provided with a hot melt area for connecting the sheathing insulating member, and the second end opening 242 of the second channel 24 is spaced apart from the hot melt area. In this way, by spacing the second end opening 242 of the second channel 24 apart from the hot melt area, it is possible to avoid the second end opening 242 from interfering with the connection of the sheathing insulating member.

[0151] The number of the first end openings 241 of the second channel 24 is multiple, and they are arranged on the convex portion 22 at intervals along the circumference of the liquid-conducting through hole 221. In this embodiment, the number of the first end openings 241 of the second channel 24 is six, but it is not limited thereto. In other embodiments, the number of the first openings may also be two, three, four, or other values. In this way, by providing multiple first end openings 241, more openings for the electrolyte to flow into the second channel 24 can be provided; further, multiple first end openings 241 are arranged on the convex portion 22 at intervals along the circumference of the liquid-conducting through hole 221, so that the electrolyte can enter the second channel 24 more evenly.

[0152] In this embodiment, the first end opening 241 of the second channel 24 is a groove; similarly, the second end opening 242 of the second channel 24 is a groove. However, it is not limited thereto, in other embodiments, the first end opening 241 of the second channel 24 can also be a through hole, and the second end opening 242 of the second channel 24 can also be a through hole.

[0153] Preferably, the projection of the injection hole 11 along the thickness direction T is located within the outer periphery of the liquid guiding through hole 221. In this way, by setting the projection of the injection hole 11 along the thickness direction T to be located within the outer periphery of the liquid guiding through hole 221, the electrolyte flowing in from the injection hole 11 can all enter the liquid guiding through hole 221 and flow into the interior of the single battery 1 according to the preset channel, that is, the electrolyte can flow into the interior of the single battery 1 through the liquid outlet openings located at different positions of the preset different channels, thereby speeding up the injection process and reducing the risk of the loose diaphragm blocking the injection hole 11 in reverse.

[0154] Please refer to Figure 5 and Fig. 9 The insulating body 21 includes a first part 217 and a second part 218 connected along the length direction L, and the first part 217 and the second part 218 both include a body and a connection part. The first electrode lead-out hole 213 is respectively opened on the body 2171 of the first part and the body 2181 of the second part, and the electrode lead-out member is inserted into the first electrode lead-out hole 213; the connection part 2172 of the first part is connected to the connection part 2182 of the second part, and they are stacked along the thickness direction T. In this way, by setting the insulating body 21 to include the first part 217 and the second part 218 connected along the length direction L, and the specific structure and connection method of the first part 217 and the second part 218, the assembly and disassembly of the insulating body 21 can be facilitated.

[0155] Furthermore, the side of the main body 2171 of the first part away from the cover body 10 is the first side 21711, and the side of the main body 2181 of the second part away from the cover body 10 is the second side 21811. The first side 21711 and the second side 21811 are both flat surfaces and are located in the same plane; the side of the connecting portion 2172 of the first part away from the cover body 10 is the third side 21721, and the side of the connecting portion 2182 of the second part away from the cover body 10 is the fourth side 21821. The third side 21721 and the fourth side 21821 are both recessed in the plane where the first side 21711 and the second side 21811 are located in the direction close to the cover body 10. In this way, by setting the first side 21711 and the second side 21811 to be a flat surface and located in the same plane, it can be ensured that the contact surface between the insulating body 21 and the electrode assembly 4 is a flat surface, and the opening can be prevented from having an adverse effect on the electrode assembly 4; further, by setting the third side 21721 and the fourth side 21821 to be recessed in the plane where the first side 21711 and the second side 21811 are located in the direction close to the cover body 10, it can be prevented that the third side 21721 and the fourth side 21821 affect the contact surface between the insulating body 21 and the electrode assembly 4 to be a flat surface.

[0156] In this embodiment, the insulating member 20 further includes a snap assembly 25, which includes a first snap assembly 251 and a second snap assembly 252 that snap fit together, the first snap assembly 251 being arranged on the connection portion 2172 of the first part, the second snap assembly 252 being arranged on the connection portion 2182 of the second part corresponding to the first snap assembly 251, and the side of the snap assembly 25 away from the cover body 10 being recessed in the plane where the first side 21711 and the second side 21811 are located in the direction close to the cover body 10. In this way, by providing the snap assembly 25, a specific connection method of the first part 217 and the second part 218 is provided, which facilitates the manufacture and assembly of the first part 217 and the second part 218; by providing the side of the snap assembly 25 away from the cover body 10 being recessed in the plane where the first side 21711 and the second side 21811 are located in the direction close to the cover body 10, it is possible to prevent the snap assembly 25 from piercing the electrode assembly 4, thereby causing adverse effects such as short circuit.

[0157] Please refer to Fig.14 , the figure is a three-dimensional structural schematic diagram of another embodiment of the insulating member 20 of this embodiment. In this embodiment, the first part 217 and the second part 218 of the insulating body are integrally formed. It should be noted that, Fig.14 The dotted line in the figure does not exist in the actual structure, and is only used to divide the first part 217 and the second part 218 on the integral structure of the insulating body for illustration.

[0158] In this embodiment, by setting the specific structure of the insulating member 20, by setting the second channel 24 connected to the first channel 23, and the first end opening 241 of the second channel 24 is opened on the side of the protrusion 22, and the second end opening 242 of the second channel 24 is opened on the insulating body 21, so that the electrolyte can flow into the interior of the single battery 1 through the liquid outlet openings located at different positions of different channels, thereby speeding up the injection process and reducing the risk of the loose diaphragm blocking the injection hole 11 in reverse.

[0159] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A cover plate assembly, characterized in that: It includes: A cover plate body, with a penetrating liquid injection hole opened along the thickness direction of the cover plate body; An insulating member, comprising an insulating body and a convex portion arranged on a side of the insulating body facing the cover body, the convex portion having a liquid conducting through hole extending therethrough along the thickness direction, the liquid conducting through hole being arranged corresponding to the liquid injection hole to form a first channel communicating with the liquid injection hole; The insulating member is further formed with a second channel communicating with the first channel, a first end opening of the second channel is opened on a side surface of the convex portion, and a second end opening of the second channel is opened on the insulating body.

2. The cover plate assembly according to claim 1, characterized in that: The insulating body comprises a bottom wall and a side wall, one end of the side wall is connected to the bottom wall, and the other end extends toward the cover body; The convex portion is arranged on a side of the bottom wall facing the cover plate body, and the bottom wall and the side wall are arranged to form a flow cavity, and the flow cavity is used to connect the first end opening and the second end opening.

3. The cover plate assembly according to claim 2, characterized in that: The second end opening is disposed on the side wall and / or the bottom wall.

4. The cover plate assembly according to claim 2, characterized in that: The side wall comprises: a first side wall and a second side wall respectively arranged on both sides of the bottom wall along the width direction of the cover plate assembly; The second end opening includes at least one of a first opening and a second opening, wherein the first opening is an opening opened on the first side wall, and the second opening is an opening opened on the second side wall.

5. The cover plate assembly according to claim 4, characterized in that: The first opening includes a plurality of first opening portions arranged at intervals; and / or, The second opening includes a plurality of second opening portions that are spaced apart from each other.

6. The cover plate assembly according to claim 5, characterized in that: The plurality of first openings are symmetrically arranged with respect to the plurality of second openings along the width direction.

7. The cover plate assembly according to claim 4, characterized in that: The cover plate assembly also includes: An electrode lead-out member is sequentially provided through the first electrode lead-out hole on the insulating body and the second electrode lead-out hole on the cover body; An explosion-proof component, an exhaust hole provided on the cover body, and an exhaust area provided on the insulating body at a position opposite to the exhaust hole along the thickness direction; Wherein, the insulating body is provided with a liquid injection area between the first electrode lead-out hole and the exhaust area, and the projection of the liquid injection hole along the thickness direction is located in the liquid injection area; The first opening of the second channel is located in the liquid injection area, and / or the second opening of the second channel is located in the liquid injection area.

8. The cover plate assembly according to claim 7, characterized in that: A side of the exhaust area away from the cover plate is a first plane, a side of the injection area away from the cover plate body is a second plane, and the first plane and the second plane are located in the same plane.

9. The cover plate assembly according to claim 8, characterized in that: The exhaust area and the liquid injection area are integrally formed.

10. The cover plate assembly according to claim 8, wherein: The insulating body further comprises an electrode area where the first electrode lead-out hole is arranged, and a recessed portion for accommodating the electrode lead-out member is formed on a side of the electrode area away from the cover body; Along the thickness direction, a height difference between an end surface of the electrode lead-out member and the second plane is less than or equal to 0.5 mm, wherein the end surface of the electrode lead-out member is an end surface of the electrode lead-out member away from the cover plate body.

11. The cover plate assembly according to claim 10, characterized in that: The end surface of the electrode lead-out member and the second plane are located in the same plane.

12. The cover plate assembly according to claim 7, wherein: The exhaust area is further provided with a reinforcing rib, which is arranged on the bottom wall, and the height of the reinforcing rib is less than or equal to the height of the higher side wall between the first side wall and the second side wall.

13. The cover plate assembly according to claim 12, wherein: The reinforcing rib is connected between the first side wall and the second side wall; The first side wall and the second side wall are respectively in contact with the cover body; There is a gap between the reinforcing rib and the cover plate body.

14. The cover plate assembly according to claim 7, wherein: The area of ​​the first opening is 10%-90% of the area of ​​the first side wall located in the liquid injection area; and / or the area of ​​the second opening is 10%-90% of the area of ​​the second side wall located in the liquid injection area.

15. The cover plate assembly according to claim 3, wherein: The outer surface of the side wall is provided with a hot-melt zone for connecting with the covering insulating member, and the second end opening of the second channel is spaced apart from the hot-melt zone.

16. The cover plate assembly according to claim 1, wherein: The number of the first end openings of the second channel is plural, and the openings are arranged on the convex portion at intervals along the circumferential direction of the liquid-conducting through hole.

17. The cover plate assembly according to claim 1, wherein: The first end opening of the second channel is a groove or a through hole; and / or the second end opening of the second channel is a groove or a through hole.

18. The cover plate assembly according to claim 1, wherein: The projection of the liquid injection hole along the thickness direction is located within the outer periphery of the liquid guiding through hole.

19. The cover plate assembly according to any one of claims 1 to 18, characterized in that: The insulating body includes a first part and a second part connected along the length direction, the first part and the second part each include a main body and a connecting portion, the main body of the first part and the main body of the second part are respectively provided with a first electrode lead-out hole, and the electrode lead-out piece is passed through the first electrode lead-out hole; the connecting portion of the first part and the connecting portion of the second part are connected and overlapped along the thickness direction.

20. The cover plate assembly according to claim 19, wherein: The side of the main body of the first part away from the cover body is the first side, and the side of the main body of the second part away from the cover body is the second side. The first side and the second side are both flat surfaces and are located in the same plane. The side of the connecting portion of the first part away from the cover body is the third side, and the side of the connecting portion of the second part away from the cover body is the fourth side. The third side and the fourth side are both recessed in the plane where the first side and the second side are located in a direction close to the cover body.

21. The cover plate assembly according to claim 20, wherein: The insulating member also includes a snap-on assembly, which includes a first snap-on member and a second snap-on member that snap-fit ​​together, wherein the first snap-on member is arranged on the connecting portion of the first part, and the second snap-on member is arranged on the connecting portion of the second part corresponding to the first snap-on member, and a side of the snap-on assembly away from the cover body is recessed in a plane where the first side and the second side are located along a direction approaching the cover body.

22. A single cell battery, characterized in that: It includes: case; The cover plate assembly according to any one of claims 1 to 21, wherein the cover plate assembly is disposed on the shell and defines a receiving cavity together with the shell; The electrode assembly is accommodated in the accommodation cavity.

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