WO2024098421A1 - 储能装置及用电设备 - Google Patents

储能装置及用电设备 Download PDF

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Publication number
WO2024098421A1
WO2024098421A1 PCT/CN2022/131543 CN2022131543W WO2024098421A1 WO 2024098421 A1 WO2024098421 A1 WO 2024098421A1 CN 2022131543 W CN2022131543 W CN 2022131543W WO 2024098421 A1 WO2024098421 A1 WO 2024098421A1
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WIPO (PCT)
Prior art keywords
arc segment
notch
segment
lower plastic
arc
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PCT/CN2022/131543
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English (en)
French (fr)
Inventor
周文扬
熊永锋
阳明
Original Assignee
深圳海润新能源科技有限公司
厦门海辰储能科技股份有限公司
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Application filed by 深圳海润新能源科技有限公司, 厦门海辰储能科技股份有限公司 filed Critical 深圳海润新能源科技有限公司
Priority to PCT/CN2022/131543 priority Critical patent/WO2024098421A1/zh
Publication of WO2024098421A1 publication Critical patent/WO2024098421A1/zh

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  • the present application relates to the field of energy storage technology, and in particular to an energy storage device and electrical equipment.
  • Secondary batteries such as lithium-ion batteries are commonly used energy storage devices. They have the advantages of high energy density, high power density, many cycles and long storage time. In recent years, they have been widely used in electric vehicles such as electric vehicles and electric bicycles, and large and medium-sized electric equipment such as energy storage facilities.
  • the cells in secondary batteries usually need to be filled with electrolyte.
  • the purpose of the present application is to provide an energy storage device and electrical equipment, wherein the flow uniformity of the electrolyte during filling is better.
  • an energy storage device comprising:
  • the electrode assembly being accommodated in the housing
  • a top cover covers the opening and has a liquid injection hole
  • a lower plastic wherein the lower plastic has a through hole, the lower plastic is arranged on a side of the top cover close to the electrode assembly, the lower plastic comprises a plurality of bosses arranged at intervals along the length direction of the lower plastic, the plurality of bosses at least comprises a first boss and a second boss, the first boss and the second boss are respectively located at two ends of the length direction of the lower plastic, the plurality of bosses are located on a side of the lower plastic facing the electrode assembly, and the through hole is communicated with the injection hole;
  • a connecting sheet the connecting sheet being arranged on a side of the lower plastic facing the electrode assembly, and having a gap between at least part of the connecting sheet and the lower plastic in a thickness direction of the connecting sheet;
  • An insulating patch which is attached to a side of the connecting sheet facing the electrode assembly and covers the connecting sheet and the through hole;
  • the first boss and the second boss are respectively provided with notches on one side close to the connecting sheet, and the insulating patch, the connecting sheet and the notches are surrounded to form a first flow channel for the electrolyte, and the electrolyte enters the injection hole and can flow to the electrode assembly through the first flow channel.
  • the notch includes a first arc segment, a second arc segment, a third arc segment, and a fourth arc segment arranged in sequence along the width direction of the lower plastic, the first arc segment is connected to the second arc segment, the third arc segment is connected to the fourth arc segment, the second arc segment is connected to the third arc segment, the first arc segment is closer to the through hole relative to the second arc segment, the fourth arc segment is closer to the through hole relative to the third arc segment, and the first arc segment, the second arc segment, the third arc segment and the fourth arc segment constitute the groove edge of the notch.
  • reinforcing ribs extending toward one side of the electrode assembly are formed on both sides of the lower plastic in the width direction, the connecting sheet and the reinforcing rib have a gap in the width direction of the lower plastic, and the insulating patch at least partially located on the connecting sheet and the reinforcing rib have a gap in the width direction of the lower plastic; the insulating patch, the connecting sheet and the reinforcing rib together form a second flow channel for the electrolyte, and the electrolyte enters the injection hole and can flow to the electrode assembly through the second flow channel.
  • the connecting piece includes a pole connecting portion, a transition portion and two pole lug connecting portions, and the pole connecting portion is connected to the two pole lug connecting portions through the transition portion; the two pole lug connecting portions are located on the side of the transition portion away from the notch, and the two pole lug connecting portions are spaced apart in the width direction of the connecting piece, the through hole is located between the two pole lug connecting portions, and the insulating patch completely covers the area between the two pole lug connecting portions.
  • the connecting piece further includes a protrusion, the protrusion is located on a side of the transition portion facing the notch, and at least a portion of the protrusion is located in the notch.
  • the transition portion in the length direction of the lower plastic, there is a gap between the transition portion and the boss, and the insulating patch covers the gap.
  • the insulating patch in the length direction of the lower plastic, covers the protrusion and at least a portion of the notch.
  • At least a portion of the insulating patch covers a side of the boss facing the electrode assembly.
  • the electrode assembly includes a bare cell and a tab connected to the bare cell, the tab is connected to the connecting sheet, and the insulating patch also completely covers the tab and at least a portion of the bare cell.
  • the insulating patch includes a plurality of sub-insulating patches, and adjacent sub-insulating patches have overlapping areas.
  • the notch also includes: at least one of a first straight line segment, a second straight line segment and a third straight line segment, the first straight line segment is connected between the first arc segment and the second arc segment, the second straight line segment is connected between the third arc segment and the fourth arc segment, and the third straight line segment is connected between the second arc segment and the third arc segment.
  • the radian of the first arc segment is ⁇ /3 to ⁇ /2
  • the radian of the fourth arc segment is ⁇ /3 to ⁇ /2
  • the arc radius of the first arc segment is 1 mm to 3 mm, and/or the arc radius of the fourth arc segment is 1 mm to 3 mm.
  • the radian of the second arc segment is ⁇ /3 to ⁇ /2, and/or the radian of the third arc segment is ⁇ /3 to ⁇ /2.
  • the arc radius of the second arc segment is 1 mm to 3 mm, and/or the arc radius of the third arc segment is 1 mm to 3 mm.
  • the width of the notch is 40% to 60% of the width of the boss.
  • the width of the notch is 25 mm to 30 mm.
  • the depth of the notch is 20% to 30% of the length of the boss.
  • the depth of the notch is 3 mm to 6 mm.
  • the notch further includes: a first straight line segment, a second straight line segment and a third straight line segment, the first straight line segment is connected between the first arc segment and the second arc segment, the second straight line segment is connected between the third arc segment and the fourth arc segment, and the third straight line segment is connected between the second arc segment and the third arc segment;
  • the raised portion includes a top surface facing the notch and a first side surface and a second side surface located on both sides of the top surface in the width direction of the connecting piece, the top surface is arranged opposite to the third straight line segment and has a first preset gap, the first side surface is arranged opposite to the first straight line segment and has a second preset gap, and the second side surface is arranged opposite to the second straight line segment and has a third preset gap; the first preset gap is 2mm to 5mm, the second preset gap is 3mm to 10mm, and the third preset gap is 3mm to 10mm.
  • an electrical device which includes the above-mentioned energy storage device.
  • FIG1 is a schematic diagram of an energy storage device provided in one embodiment of the present application.
  • FIG2 is an exploded view of an energy storage device provided in one embodiment of the present application.
  • FIG3 is a schematic diagram of the connection between an electrode assembly and a connecting sheet provided in one embodiment of the present application.
  • FIG4 is a schematic diagram of a top cover provided in one embodiment of the present application.
  • FIG5 is a schematic diagram of a lower plastic and a connecting sheet provided in one embodiment of the present application.
  • FIG6 is a schematic diagram of an insulating patch and a connecting sheet provided in one embodiment of the present application.
  • FIG7 is a schematic diagram of a lower plastic provided by an embodiment of the present application.
  • FIG8 is a schematic diagram of a first connecting sheet provided in one embodiment of the present application.
  • FIG9 is a schematic diagram of a second connecting sheet provided in one embodiment of the present application.
  • FIG. 10 is a schematic diagram of a vehicle provided in accordance with an embodiment of the present application.
  • top cover 112, lower plastic; 1120, boss; 1121, first boss; 1122, second boss; 113, notch; 1131, first notch; 1132, second notch; 1141, first arc segment; 1142, second arc segment; 1143, third arc segment; 1144, fourth arc segment; 1145, first straight line segment; 1146, second straight line segment; 1147, third straight line segment; 115, pole; 1151, first pole; 1152, second pole; 1160, explosion-proof valve; 1170, injection hole; 1180, through hole; 1190, reinforcing rib;
  • connecting piece 120, connecting piece; 121, first connecting piece; 1211, first transition portion; 1212, first pole ear connecting portion; 1213, first protrusion; 1214, first pole column connecting portion; 122, second connecting piece; 1221, second transition portion; 1222, second pole ear connecting portion; 1223, second protrusion; 1224, second pole column connecting portion;
  • electrode assembly 1310, first bare cell; 1311, first pole ear of first bare cell; 1312, second pole ear of first bare cell; 1320, second bare cell; 1321, first pole ear of second bare cell; 1322, second pole ear of second bare cell;
  • the energy storage device 10 includes: a shell 140, an electrode assembly 130, a top cover 111, a lower plastic 112, a connecting sheet 120 and an insulating patch 150, the shell 140 has an opening to accommodate electrolyte, and the electrode assembly 130 is accommodated in the shell 140; the top cover 111 covers the opening of the shell 140, and the top cover 111 has a liquid injection hole 1170; the lower plastic 112 has a through hole 1180, and the lower plastic 112 is arranged on a side of the top cover 111 close to the electrode assembly 130, and the lower plastic 112 has a plurality of bosses 1120 arranged at intervals along the length direction X of the lower plastic 112, and the plurality of bosses 1120 includes at least a first boss 1121 and a second boss 1122, wherein the first boss 1121 and the second boss 1122 are respectively located at the two ends of the length direction X of the lower plastic 112, and multiple bosses
  • a notch 113 is provided on one side of the first boss 1121 and the second boss 1122 close to the connecting sheet 120.
  • the insulating patch 150, the connecting sheet 120 and the notch 113 form a first flow channel for the electrolyte.
  • the electrolyte enters the injection hole 1170 and can flow to the electrode assembly 130 through the first flow channel.
  • the energy storage device provided in the present application has a gap between the connecting piece 120 and the lower plastic 112, a notch 113 is provided on the side of the boss 1120 close to the connecting piece 120, and the insulating patch 150 covers the connecting piece 120 and the through hole 1180, so that the insulating patch 150, the connecting piece 120 and the groove edge enclose a first flow channel for the electrolyte; when the electrolyte is added to the shell 140 through the injection hole 1170, since the insulating patch 150 covers the connecting piece 120 and the through hole 1180, the electrolyte flows along the gap between the insulating patch 150 and the connecting piece 120 and the lower plastic 112, and then the electrolyte can flow out through the notch 113 of the boss 1120, and then flow to the electrode assembly 130, thereby realizing the diversion of the electrolyte, so that the electrolyte can fully flow to various parts of the electrode assembly 130, thereby improving the wetting uniformity of the electrode assembly 130.
  • the notch 113 includes a first arc segment 1141, a second arc segment 1142, a third arc segment 1143, and a fourth arc segment 1144 arranged in sequence along the width direction of the lower plastic 112, the first arc segment 1141 is connected to the second arc segment 1142, the third arc segment 1143 is connected to the fourth arc segment 1144, the second arc segment 1142 is connected to the third arc segment 1143, the first arc segment 1141 is closer to the through hole 1180 than the second arc segment 1142, the fourth arc segment 1144 is closer to the through hole 1180 than the third arc segment 1143, the first arc segment 1141, the second arc segment 1142, the third arc segment 1143 and the fourth arc segment 1144 constitute the groove edge of the notch 113.
  • the first arc segment 1141, the second arc segment 1142, the third arc segment 1143 and the fourth arc segment 1144 form the groove edge of the notch 113, so that the corner of the notch 113 of the boss 1120 is rounded.
  • the flow rate of the electrolyte at the corner of the notch 113 is faster, so that the electrolyte can flow into the electrode assembly 130 faster and more smoothly; at the same time, setting the corner of the notch 113 to a rounded corner can prevent the corner of the notch 113 from scratching the pole ear, thereby improving the reliability of the energy storage device.
  • the electrode assembly 130 includes a bare cell, a first pole ear, and a second pole ear, one of which is a positive pole ear, and the other is a negative pole ear.
  • the bare cell is a wound bare cell
  • the electrode assembly 130 includes a first bare cell 1310 and a second bare cell 1320, which are stacked in the thickness direction Z and placed in the shell 140.
  • the first bare cell 1310 is connected to the first bare cell first pole ear 1311 and the first bare cell second pole ear 1312;
  • the second bare cell 1320 is connected to the second bare cell first pole ear 1321 and the second bare cell second pole ear 1322.
  • the electrode assembly 130 can also be a single bare cell, or be formed by a combination of three, four or more single bare cells, and this application does not limit this.
  • two bosses 1120 are formed at both ends of the length direction X of the lower plastic 112, namely, a first boss 1121 and a second boss 1122.
  • a first notch 1131 is provided on the first boss 1121
  • a second notch 1132 is provided on the second boss 1122, and the openings of the first notch 1131 and the second notch 1132 are arranged facing each other.
  • the top cover 111 can be quickly positioned and installed on the shell 140, thereby improving the installation efficiency of the top cover 111 and the shell 140; at the same time, the boss 1120 abuts against the bare battery cell in the shell 140 to fix the bare battery cell.
  • the energy storage device 10 includes two connecting pieces 120, namely, a first connecting piece 121 and a second connecting piece 122, wherein the first connecting piece 121 is located on a side close to the first boss 1121, and the second connecting piece 122 is located on a side close to the second boss 1122.
  • the specific structure of the lower plastic 112 and the connecting piece 120 in the present application is exemplified by the specific matching structure of the first connecting piece 121 and the lower plastic 112, and the specific matching structure of the second connecting piece 122 and the lower plastic 112.
  • a first notch 1131 is provided on one side of the first boss 1121 close to the first connecting piece 121.
  • the first notch 1131 is arranged along the width direction Y of the lower plastic 112 in sequence with a first arc segment 1141, a second arc segment 1142, a third arc segment 1143, and a fourth arc segment 1144.
  • the first arc segment 1141 is connected to the second arc segment 1142
  • the third arc segment 1143 is connected to the fourth arc segment 1144
  • the second arc segment 1141 is connected to the second arc segment 1142.
  • the first arc segment 1141 is closer to the through hole 1180 than the second arc segment 1142
  • the fourth arc segment 1144 is closer to the through hole 1180 than the third arc segment 1143
  • the first arc segment 1141, the second arc segment 1142, the third arc segment 1143 and the fourth arc segment 1144 constitute the groove edge of the first notch 1131; the first insulating patch 151, the first connecting piece 121 and the first groove edge enclose a first flow channel for the electrolyte.
  • a first notch 1131 is provided on one side of the first boss 1121 close to the first connecting sheet 121, and the first insulating patch 151 covers the first connecting sheet 121 and the through hole 1180, so that the first insulating patch 151, the first connecting sheet 121 and the first groove edge enclose a first flow channel for the electrolyte;
  • the electrolyte is added into the shell 140 through the injection hole 1170, since the first insulating patch 151 covers the first connecting sheet 121 and the through hole 1180, the electrolyte flows along the gap between the first insulating patch 151 and the first connecting sheet 121 and the lower plastic 112, and then the electrolyte can flow out through the first notch 1131 of the first boss 1121, and then flow to the electrode assembly 130, thereby achieving the diversion of the electrolyte, so that the electrolyte can fully flow to various parts of the electrode assembly 130.
  • reinforcing ribs 1190 extending toward one side of the electrode assembly 130 are formed on both sides of the lower plastic 112 in the width direction Y, and the first connecting piece 121 and the reinforcing rib 1190 have a gap in the width direction of the lower plastic 112, and the first insulating patch 151 at least partially located on the first transition portion 1211 has a gap in the width direction Y of the lower plastic 112; the first insulating patch 151, the first connecting piece 121 and the reinforcing rib 1190 enclose a second flow channel for the electrolyte, and the electrolyte enters the injection hole 1170 and can flow to the electrode assembly 130 through the second flow channel.
  • the first insulating patch 151, the first connecting piece 121 and the reinforcing rib 1190 form a second flow channel for the electrolyte.
  • the electrolyte is added into the shell 140 through the injection hole 1170, since the first insulating patch 151 covers the first connecting piece 121 and the through hole 1180, the electrolyte flows along the gap between the first insulating patch 151 and the first connecting piece 121 and the lower plastic 112, and then the electrolyte can flow out through the gap between the first connecting piece 121 and the reinforcing rib 1190, and then flow to the electrode assembly 130, thereby guiding the electrolyte.
  • the second flow channel cooperates with the first flow channel, so that the electrolyte can fully flow to various parts of the electrode assembly 130.
  • the first connecting piece 121 includes a first pole column connection portion 1214, a first transition portion 1211 and two first pole ear connection portions 1212, and the first pole column connection portion 1214 is connected to the two first pole ear connection portions 1212 through the first transition portion 1211; the two first pole ear connection portions 1212 are located on the side of the first transition portion 1211 away from the first notch 1131, and the two first pole ear connection portions 1212 are spaced apart in the width direction of the first connecting piece 121, the through hole 1180 is located between the two first pole ear connection portions 1212, and the first insulating patch 151 completely covers the area between the two first pole ear connection portions 1212.
  • the first insulating patch 151 completely covers the area between the two first pole ear connecting portions 1212, so that the electrolyte flowing in through the through hole 1180 flows toward the gap between the first connecting sheet 121 and the lower plastic 112 under the guidance of the first insulating patch 151, and then flows into the electrode assembly 130 through the first flow channel and the second flow channel.
  • the first connecting piece 121 further includes a first protrusion 1213 , which is located on a side of the first transition portion 1211 facing the first notch 1131 , and at least a portion of the first protrusion 1213 is located in the first notch 1131 .
  • the first protruding portion 1213 when the first connecting piece 121 is laser welded to the first pole 1151 through the first pole connecting portion 1214, the first protruding portion 1213 facilitates the welding nozzle (copper nozzle) for laser welding to press against the side of the first connecting piece 121 on which the first protruding portion 1213 is provided, and the first notch 1131 provides an escape space for the welding nozzle to press against the first protruding portion 1213, thereby improving the stability of the laser welding between the first connecting piece 121 and the first pole 1151, and improving the efficiency and yield of the laser welding between the first connecting piece 121 and the first pole 1151; after the first connecting piece 121 and the first pole 1151 are connected and energized, the first protruding portion 1213 can provide an additional current flow path when the current is too large, thereby improving the current carrying capacity of the first connecting piece 121, thereby improving the stability and safety of the energy storage device.
  • the first transition portion 1211 and the first boss 1121 there is a gap between the first transition portion 1211 and the first boss 1121, and the first insulating patch 151 covers the gap.
  • the electrolyte in the first flow channel flows into the electrode assembly 130 through the first notch 1131; in addition, when the first insulating patch 151 covers the gap, at least part of the first insulating patch 151 covers the edge of the first boss 1121, which can prevent the edge of the first boss 1121 from scratching the tab.
  • the first insulating patch 151 covers the first protrusion 1213 and at least part of the first notch 1131.
  • the first insulating patch 151 covers the first protrusion, and the first insulating patch 151 completely covers the first connecting piece 121, thereby forming an insulating effect of the first connecting piece 121, and preventing the first connecting piece 121 from contacting with the electrode in the bare battery cell to cause a short circuit; at the same time, by making the first insulating patch 151 cover at least part of the first notch 1131, the electrolyte needs to flow out of the first notch 1131 through the first arc segment 1141 and the fourth arc segment 1144, and the flow rate of the electrolyte is relatively increased through the first arc segment 1141 and the fourth arc segment 1144.
  • the first insulating patch 151 covers the side of the first boss 1121 facing the electrode assembly 130.
  • the adhesion of the first insulating patch 151 is improved to prevent the first insulating patch 151 from falling off.
  • the first insulating patch 151 also covers the first bare cell first pole lug 1311 and at least part of the first bare cell 1310 connected to the first pole lug connection portion 1212, as well as the second bare cell first pole lug 1321 and at least part of the second bare cell 1320.
  • the first insulating patch 151 By making the first insulating patch 151 also cover the first bare cell first pole lug 1311 and at least part of the first bare cell 1310 connected to the first pole lug connection portion 1212, as well as the second bare cell first pole lug 1321 and at least part of the second bare cell 1320, the first insulating patch 151 completely covers the first connecting piece 121 and the first bare cell first pole lug 1311 and the second bare cell first pole lug 1321, thereby preventing welding slag from falling into the bare cell and causing a short circuit, and at the same time improving the stability of the first pole lug connection portion 1212 and the first bare cell first pole lug 1311 and the second bare cell first pole lug 1321 after welding.
  • the first insulating patch 151 is formed by connecting multiple sub-insulating patches, and the multiple sub-insulating patches respectively cover different areas of the first connecting piece 121, the first bare battery cell 1310, the first bare battery cell first pole ear 1311, the second bare battery cell 1320 and the second bare battery cell first pole ear 1321, and there is an overlapping area between adjacent sub-insulating patches, which reduces the process difficulty when bonding the first insulating patch 151, improves the bonding strength of the first insulating patch 151 in different areas, and also reduces the manufacturing difficulty and cost of the first insulating patch 151.
  • the first notch 1131 further includes: at least one of a first straight line segment 1145, a second straight line segment 1146 and a third straight line segment 1147, wherein the first straight line segment 1145 is connected between the first arc segment 1141 and the second arc segment 1142, the second straight line segment 1146 is connected between the third arc segment 1143 and the fourth arc segment 1144, and the third straight line segment 1147 is connected between the second arc segment 1142 and the third arc segment 1143.
  • the corner of the first notch 1131 is rounded, thereby increasing the flow rate of the electrolyte flowing through.
  • the angle between the first straight line segment 1145 and the third straight line segment 1147 is an obtuse angle.
  • the opening of the first notch 1131 becomes relatively larger, thereby further facilitating the electrolyte to flow into the gap between the first protrusion 1213 and the first notch 1131, and increasing the angle arc between the first straight line segment 1145 and the third straight line segment 1147, so that the flow rate of the electrolyte at the first straight line segment 1145 and the third straight line segment 1147 can be further increased, so that the electrolyte can flow into the electrode assembly 130 faster.
  • the angle between the first straight line segment 1145 and the third straight line segment 1147 can also be a right angle.
  • the angle between the second straight line segment 1146 and the third straight line segment 1147 is an obtuse angle.
  • the opening of the first notch 1131 becomes relatively larger, thereby further facilitating the electrolyte to flow into the gap between the first protrusion 1213 and the first notch 1131, and increasing the angle arc between the second straight line segment 1146 and the third straight line segment 1147, so that the flow rate of the electrolyte at the second straight line segment 1146 and the third straight line segment 1147 can be further increased, so that the electrolyte can flow into the electrode assembly 130 faster.
  • the angle between the second straight line segment 1146 and the third straight line segment 1147 can also be a right angle.
  • the first arc segment 1141 has an arc angle of ⁇ /3 to ⁇ /2, such as ⁇ /3, 5 ⁇ /12, ⁇ /2, etc.
  • ⁇ /3 ⁇ /3
  • 5 ⁇ /12 ⁇ /2
  • ⁇ /2 ⁇ /2
  • the arc angle of the first arc segment 1141 may also be less than ⁇ /3 or greater than ⁇ /2, and the present application does not limit this.
  • the curvature of the fourth arc segment 1144 is ⁇ /3 to ⁇ /2, such as ⁇ /3, 5 ⁇ /12, ⁇ /2, etc.
  • ⁇ /3 to ⁇ /2 By making the curvature of the first arc segment 1141 ⁇ /3 to ⁇ /2, it is beneficial to provide the flow of electrolyte at the fourth arc segment 1144, which is convenient for the formation of the first notch 1131.
  • the curvature of the fourth arc segment 1144 can also be less than ⁇ /3 or greater than ⁇ /2, and this application does not limit this.
  • the curvature of the first arc segment 1141 and the curvature of the fourth arc segment 1144 can be the same or different.
  • the arc radius of the first arc segment 1141 is 1 mm to 3 mm, such as 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, etc., which are not listed here in this application; by making the arc radius of the first arc segment 1141 1 mm to 3 mm, it is ensured that the first arc segment 1141 can meet the need of increasing the flow rate of the electrolyte.
  • the arc radius of the first arc segment 1141 can also be less than 1 mm or greater than 3 mm.
  • the arc radius of the fourth arc segment 1144 is 1 mm to 3 mm, such as 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, etc., which are not listed here in this application; by making the arc radius of the fourth arc segment 1144 1 mm to 3 mm, it is ensured that the first arc segment 1141 can meet the need to increase the flow rate of the electrolyte.
  • the arc radius of the fourth arc segment 1144 can also be less than 1 mm or greater than 3 mm.
  • the arc radius of the first arc segment 1141 and the arc radius of the fourth arc segment 1144 can be the same or different.
  • the curvature of the second arc segment 1142 is ⁇ /3 to ⁇ /2, such as ⁇ /3, 5 ⁇ /12, ⁇ /2, etc.
  • ⁇ /3 to ⁇ /2 By making the curvature of the second arc segment 1142 ⁇ /3 to ⁇ /2, it is beneficial to provide the flow of the electrolyte at the second arc segment 1142, and it is convenient to form the first notch 1131.
  • the curvature of the second arc segment 1142 can also be less than ⁇ /3 or greater than ⁇ /2, and the present application does not limit this.
  • the curvature of the third arc segment 1143 is ⁇ /3 to ⁇ /2, such as ⁇ /3, 5 ⁇ /12, ⁇ /2, etc.
  • the curvature of the second arc segment 1142 can also be less than ⁇ /3 or greater than ⁇ /2, and this application does not limit this.
  • the curvature of the second arc segment 1142 can be the same as or different from the curvature of the first arc segment 1141, the third arc segment 1143, and the fourth arc segment 1144.
  • the arc radius of the second arc segment 1142 is 1 mm to 3 mm, such as 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, etc., which are not listed here in this application; by making the arc radius of the second arc segment 1142 1 mm to 3 mm, it is ensured that the second arc segment 1142 can meet the need of increasing the flow rate of the electrolyte.
  • the arc radius of the second arc segment 1142 can also be less than 1 mm or greater than 3 mm.
  • the arc radius of the third arc segment 1143 is 1mm to 3mm, such as 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, etc., which are not listed here one by one in this application; by making the arc radius of the third arc segment 1143 1mm to 3mm, it is ensured that the second arc segment 1142 can meet the need of increasing the flow rate of the electrolyte.
  • the arc radius of the third arc segment 1143 can also be less than 1mm or greater than 3mm.
  • the arc radius of the second arc segment 1142 can be the same as or different from the arc radius of the first arc segment 1141, the third arc segment 1143 and the fourth arc segment 1144.
  • the width of the first notch 1131 is 40% to 60% of the width of the first boss 1121, such as 40%, 45%, 50%, 55%, 60%, etc., which are not listed here in this application. It is ensured that there is enough gap between the first notch 1131 and the first protrusion 1213 to facilitate the flow of electrolyte and facilitate the contact of the welding nozzle on the first connecting piece 121 to form enough avoidance space.
  • the width of the first notch 1131 can also be less than 40% of the width of the first boss 1121 or greater than 60% of the width of the first boss 1121, and this application does not limit this.
  • the length of the lower plastic 112 can be 250mm ⁇ 280mm, for example, 250mm, 260.88mm, 270mm, 280mm, etc.; the width of the lower plastic 112 can be 50mm ⁇ 60mm, for example, 50mm, 52mm, 53mm, 58.08mm, 60mm, etc.; the maximum width of the first boss 1121 is the same as the width of the lower plastic 112, and the thickness of the first boss 1121 can be 2mm ⁇ 3mm, for example, 2.0mm, 2.2mm, 2.58mm, 2.8mm, 3.0mm, etc.; the length of the first boss 1121 can be 15mm ⁇ 25mm, for example, 15mm, 18mm, 20mm, 22mm, 25mm, etc., which is the maximum length of the first boss 1121.
  • the width of the first notch 1131 is 25mm to 30mm, for example, 25mm, 26mm, 27mm, 28.13mm, 29mm, 30mm, which are not listed here one by one in this application.
  • the above width is the maximum width of the first notch 1131. It is ensured that there is enough gap between the first notch 1131 and the first protrusion 1213 to facilitate the flow of electrolyte and facilitate the contact of the welding nozzle on the first connecting piece 121 to form enough avoidance space.
  • the width of the first notch 1131 can also be less than 25mm or greater than 30mm, and this application does not limit this.
  • the depth of the first notch 1131 is 20% to 30% of the length of the first boss 1121, such as 20%, 22%, 25%, 28%, 30%, etc., which are not listed here in this application. It is ensured that there is enough gap between the first notch 1131 and the first protrusion 1213 to facilitate the flow of electrolyte and facilitate the contact of the welding nozzle on the first connecting piece 121 to form enough avoidance space.
  • the depth of the first notch 1131 can also be less than 20% of the length of the first boss 1121 or greater than 30% of the length of the first boss 1121, and this application does not limit this.
  • the depth of the first notch 1131 is 3 mm to 6 mm, for example, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, and 6.0 mm, which are not listed here. It is ensured that there is enough clearance between the first notch 1131 and the first protrusion 1213 to facilitate the flow of electrolyte and facilitate the contact of the welding nozzle on the first connecting piece 121 to form enough avoidance space.
  • the depth of the first notch 1131 can also be less than 3 mm or greater than 6 mm, and this application does not limit this.
  • the first boss 1121 is symmetrical about the central axis of the length direction X of the lower plastic 112.
  • the first boss 1121 is a symmetrical structure
  • the first notch 1131 is a symmetrical structure
  • the first arc segment 1141 is symmetrical with the fourth arc segment 1144
  • the second arc segment 1142 is symmetrical with the third arc segment 1143, so that the electrolyte flows evenly from both sides in the width direction Y of the lower plastic 112 into the gap between the first protrusion 1213 and the first notch 1131, thereby further enabling the electrolyte to flow evenly into the bare battery cell.
  • the first protrusion 1213 includes a top surface facing the first notch 1131 and a first side surface and a second side surface located on both sides of the top surface in the width direction of the first connecting piece 121.
  • the top surface, the first side surface and the second side surface are planes.
  • the top surface is perpendicular to the length direction X of the lower plastic 112.
  • the angle between the first side surface and the second side surface and the top surface is a right angle or an obtuse angle.
  • the orthographic projection of the first protrusion 1213 on the lower plastic 112 is a rectangle; when the angle between the side surface and the top surface of the first protrusion 1213 is an obtuse angle, the orthographic projection of the first protrusion 1213 on the lower plastic 112 is a trapezoid; of course, the angle between the side surface and the top surface of the first protrusion 1213 can also be an acute angle, and the first side surface and the second side surface of the first protrusion 1213 can also be a curved surface or a concave-convex surface, which is not limited in this application.
  • the top surface of the first protrusion 1213 is arranged opposite to the third straight line segment 1147 and has a first preset gap, the first preset gap is 2mm to 5mm, such as 2mm, 3mm, 4mm, 5mm, etc., which are not listed one by one in this application;
  • the first side surface of the first protrusion 1213 is arranged opposite to the first straight line segment 1145 and has a second preset gap, the second preset gap is 3mm to 10mm, such as 3mm, 5mm, 8mm, 10mm, etc., which are not listed one by one in this application;
  • the second side surface of the first protrusion 1213 is arranged opposite to the second straight line segment 1146 and has a third preset gap, the third preset gap is 3mm to 10mm, such as 3mm, 5mm, 8mm, 10mm, etc., which are not listed one by one in this application.
  • the outlet of the first flow channel is formed between the first protrusion 1213 and the first notch 1131, so as to achieve the purpose of the electrolyte flowing into the bare battery cell through the first flow channel.
  • the width of the first protrusion 1213 is 20% to 50% of the width of the first transition portion 1211, for example, 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc., which are not listed here in the present application.
  • the specific width of the first protrusion 1213 can be set according to the specific size of the first connecting piece 121.
  • the first protrusion 1213 By making the width of the first protrusion 1213 20% to 50% of the width of the first transition portion 1211, the first protrusion 1213 can have a sufficient width to facilitate the contact of the welding nozzle, so that the first protrusion 1213 can provide an additional current flow path; at the same time, it can avoid the first notch 1131 being too wide, resulting in the first boss 1121 being too small in area.
  • the width of the first protrusion 1213 may be less than 20% of the width of the first transition portion 1211 , or the width of the first protrusion 1213 may be greater than 50% of the width of the first transition portion 1211 , and this application does not impose any limitation on this.
  • the length of the first protrusion 1213 is 10% to 30% of the length of the first transition part 1211, for example, 10%, 15%, 20%, 25%, 30%, etc., which are not listed one by one in this application.
  • the specific length of the first protrusion 1213 can be set according to the specific size of the first connecting piece 121.
  • the first protrusion 1213 By making the length of the first protrusion 1213 10% to 30% of the length of the first transition part 1211, the first protrusion 1213 can have a sufficient length, so that the contact of the welding nozzle is not affected by the welding position of the first pole connecting part 1214, so that the first protrusion 1213 can provide an additional current flow path; at the same time, it can prevent the first notch 1131 from being too deep in the length direction X of the top cover 111.
  • the first protrusion 1213 is symmetrical about the central axis of the length direction X of the first connecting piece 121, that is, in the width direction Y of the first connecting piece 121, the first protrusion 1213 is located in the middle of the first connecting piece 121.
  • the first pole connecting portion 1214 is located in the middle area of the first transition portion 1211, and the first protrusion 1213 is arranged in the middle of the first connecting piece 121, so that the welding nozzle can abut against the first connecting piece 121.
  • the shape of the first protrusion 1213 matches the shape of the first notch 1131.
  • the orthographic projections of the first protrusion 1213 and the first notch 1131 on the lower plastic 112 are both rectangular, or the orthographic projections of the first protrusion 1213 and the first notch 1131 on the lower plastic 112 are both trapezoidal, etc.
  • the shape of the first protrusion 1213 may not match the shape of the first notch 1131, for example, the first protrusion 1213 is rectangular and the first notch 1131 is semicircular, and the present application does not limit this.
  • a second notch 1132 is provided on one side of the second boss 1122 close to the second connecting piece 122, and the second notch 1132 is arranged in sequence along the width direction Y of the lower plastic 112 along the first arc segment 1141, the second arc segment 1142, the third arc segment 1143, and the fourth arc segment 1144, the first arc segment 1141 is connected to the second arc segment 1142, the third arc segment 1143 is connected to the fourth arc segment 1144, and the second arc segment 1141 is connected to the second arc segment 1142.
  • the first arc segment 1141 is closer to the through hole 1180 than the second arc segment 1142
  • the fourth arc segment 1144 is closer to the injection hole 1170 than the third arc segment 1143
  • the first arc segment 1141, the second arc segment 1142, the third arc segment 1143 and the fourth arc segment 1144 constitute the second groove edge of the second notch 1132;
  • the second insulating patch 152, the second connecting piece 122 and the second groove edge enclose a first flow channel for the electrolyte.
  • a second notch 1132 is provided on one side of the second boss 1122 close to the second connecting sheet 122, and the second insulating patch 152 covers the second connecting sheet 122, so that the second insulating patch 152, the second connecting sheet 122 and the second groove are surrounded to form a first flow channel for the electrolyte; when the electrolyte is added into the shell 140 through the injection hole 1170, part of the electrolyte can flow along the gap between the second insulating patch 152, the second connecting sheet 122 and the lower plastic 112, and then the electrolyte can flow out through the second notch 1132 of the second boss 1122, and then flow to the electrode assembly 130, thereby achieving the diversion of the electrolyte, so that the electrolyte can fully flow to various parts of the electrode assembly 130.
  • reinforcing ribs 1190 extending toward one side of the electrode assembly 130 are formed on both sides of the lower plastic 112 in the width direction Y, and the second connecting piece 122 and the reinforcing rib 1190 have a gap in the width direction Y of the lower plastic 112, and the second insulating patch 152 at least partially located on the second transition portion 1221 has a gap in the width direction Y of the lower plastic 112; the second insulating patch 152, the second connecting piece 122 and the reinforcing rib 1190 enclose a second flow channel for the electrolyte, and the electrolyte enters the injection hole 1170 and can flow to the electrode assembly 130 through the second flow channel.
  • the second insulating patch 152, the second connecting sheet 122 and the reinforcing rib 1190 form a second flow channel for the electrolyte.
  • the second flow channel cooperates with the first flow channel, so that the electrolyte can fully flow to various parts of the electrode assembly 130.
  • the second connecting piece 122 includes a second pole connecting portion 1224, a second transition portion 1221 and two second pole lug connecting portions 1222, and the second pole connecting portion 1224 is connected to the two second pole lug connecting portions 1222 through the second transition portion 1221; the second pole lug connecting portion 1222 is located on the side of the second transition portion 1221 away from the second notch 1132, and the two second pole lug connecting portions 1222 are spaced apart in the width direction Y of the second connecting piece 122, and the second insulating patch 152 completely covers the area between the two second pole lug connecting portions 1222.
  • the second insulating patch 152 completely covers the area between the two second pole lug connecting portions 1222, so that part of the electrolyte flowing in through the through hole 1180 flows toward the gap between the second connecting piece 122 and the lower plastic 112 under the guiding effect of the second insulating patch 152, and then flows into the electrode assembly 130 through the first flow channel and the second flow channel.
  • the second connecting piece 122 further includes a second protrusion 1223 , which is located on a side of the second transition portion 1221 facing the second notch 1132 , and at least a portion of the second protrusion 1223 is located in the second notch 1132 .
  • the second protruding portion 1223 when the second connecting piece 122 is laser welded to the second pole 1152 through the second pole connecting portion 1224, the second protruding portion 1223 facilitates the laser welding nozzle to press against the side of the second connecting piece 122 on which the second protruding portion 1223 is provided, and the second notch 1132 provides an escape space for the welding nozzle to press against the second protruding portion 1223, thereby improving the stability of the laser welding between the second connecting piece 122 and the second pole 1152, and improving the efficiency and yield of the laser welding between the second connecting piece 122 and the second pole 1152; after the second connecting piece 122 and the second pole 1152 are connected and energized, the second protruding portion 1223 can provide an additional current flow path when the current is too large, thereby improving the current carrying capacity of the second connecting piece 122, thereby improving the stability and safety of the energy storage device.
  • the second transition portion 1221 and the second boss 1122 there is a gap between the second transition portion 1221 and the second boss 1122, and the second insulating patch 152 covers the gap.
  • the electrolyte in the first flow channel flows into the electrode assembly 130 through the second notch 1132; in addition, when the second insulating patch 152 covers the gap, at least part of the second insulating patch 152 covers the edge of the second boss 1122, which can prevent the edge of the second boss 1122 from scratching the second pole ear.
  • the second insulating patch 152 covers the second protruding portion 1223 and at least part of the second notch 1132 .
  • the second insulating patch 152 covers the second protruding portion 1223 and completely covers the second connecting piece 122 , thereby forming an insulating effect of the second connecting piece 122 , and preventing the second connecting piece 122 from contacting the electrode in the bare battery cell and causing a short circuit; at the same time, by making the second insulating patch 152 cover at least part of the second notch 1132 , the electrolyte needs to flow out of the second notch 1132 through the first arc segment 1141 and the fourth arc segment 1144 , and the flow rate of the electrolyte is relatively increased through the first arc segment 1141 and the fourth arc segment 1144 .
  • the second insulating patch 152 covers the side of the second boss 1122 facing the electrode assembly 130.
  • the adhesion of the second insulating patch 152 is improved to prevent the second insulating patch 152 from falling off.
  • the second insulating patch 152 also covers the first bare cell second pole lug 1312 connected to the second pole lug connecting portion 1222 and at least a portion of the first bare cell 1310, as well as the second bare cell second pole lug 1322 and at least a portion of the second bare cell 1320.
  • the second insulating patch 152 By making the second insulating patch 152 also cover the first bare cell second pole lug 1312 connected to the second pole lug connecting portion 1222 and at least a portion of the first bare cell 1310, as well as the second bare cell second pole lug 1322 and at least a portion of the second bare cell 1320, the second insulating patch 152 completely covers the second connecting piece 122 and the first bare cell second pole lug 1312 and the second bare cell second pole lug 1322, thereby preventing welding slag from falling into the bare cell and causing a short circuit, and at the same time improving the stability of the first pole lug connecting portion 1212 and the first bare cell second pole lug 1312 and the second bare cell second pole lug 1322 after welding.
  • the second insulating patch 152 is formed by connecting multiple sub-insulating patches, and the multiple sub-insulating patches respectively cover different areas of the second connecting piece 122, the first bare battery cell 1310, the first bare battery cell second pole ear 1312, the second bare battery cell 1320 and the second bare battery cell second pole ear 1322.
  • There is an overlapping area between adjacent sub-insulating patches which reduces the process difficulty when bonding the second insulating patch 152, improves the bonding strength of the second insulating patch 152 in different areas, and also reduces the manufacturing difficulty and cost of the second insulating patch 152.
  • the second notch 1132 further includes: at least one of a first straight line segment 1145, a second straight line segment 1146 and a third straight line segment 1147, wherein the first straight line segment 1145 is connected between the first arc segment 1141 and the second arc segment 1142, the second straight line segment 1146 is connected between the third arc segment 1143 and the fourth arc segment 1144, and the third straight line segment 1147 is connected between the second arc segment 1142 and the third arc segment 1143.
  • the corner of the second notch 1132 is rounded, thereby increasing the flow rate of the electrolyte flowing through.
  • the angle between the first straight line segment 1145 and the third straight line segment 1147 is an obtuse angle.
  • the opening of the second notch 1132 becomes relatively larger, thereby further facilitating the electrolyte to flow into the gap between the second protrusion 1223 and the second notch 1132, and increasing the angle arc between the first straight line segment 1145 and the third straight line segment 1147, so that the flow rate of the electrolyte at the first straight line segment 1145 and the third straight line segment 1147 can be further increased, so that the electrolyte can flow into the electrode assembly 130 faster.
  • the angle between the first straight line segment 1145 and the third straight line segment 1147 can also be a right angle.
  • the angle between the second straight line segment 1146 and the third straight line segment 1147 is an obtuse angle.
  • the opening of the second notch 1132 becomes relatively larger, thereby further facilitating the electrolyte to flow into the gap between the second protrusion 1223 and the second notch 1132, and increasing the angle arc between the second straight line segment 1146 and the third straight line segment 1147, so that the flow rate of the electrolyte at the second straight line segment 1146 and the third straight line segment 1147 can be further increased, so that the electrolyte can flow into the electrode assembly 130 faster.
  • the angle between the second straight line segment 1146 and the third straight line segment 1147 can also be a right angle.
  • the first arc segment 1141 has an arc angle of ⁇ /3 to ⁇ /2, such as ⁇ /3, 5 ⁇ /12, ⁇ /2, etc.
  • ⁇ /3 ⁇ /3
  • 5 ⁇ /12 ⁇ /2
  • ⁇ /2 ⁇ /2
  • the arc angle of the first arc segment 1141 can also be less than ⁇ /3 or greater than ⁇ /2, and the present application does not limit this.
  • the curvature of the fourth arc segment 1144 is ⁇ /3 to ⁇ /2, such as ⁇ /3, 5 ⁇ /12, ⁇ /2, etc.
  • ⁇ /3 to ⁇ /2 By making the curvature of the first arc segment 1141 ⁇ /3 to ⁇ /2, it is beneficial to provide the flow of electrolyte at the fourth arc segment 1144, which is convenient for the formation of the second notch 1132.
  • the curvature of the fourth arc segment 1144 can also be less than ⁇ /3 or greater than ⁇ /2, and this application does not limit this.
  • the curvature of the first arc segment 1141 and the curvature of the fourth arc segment 1144 can be the same or different.
  • the arc radius of the first arc segment 1141 is 1 mm to 3 mm, such as 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, etc., which are not listed here in this application; by making the arc radius of the first arc segment 1141 1 mm to 3 mm, it is ensured that the first arc segment 1141 can meet the need of increasing the flow rate of the electrolyte.
  • the arc radius of the first arc segment 1141 can also be less than 1 mm or greater than 3 mm.
  • the arc radius of the fourth arc segment 1144 is 1 mm to 3 mm, such as 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, etc., which are not listed here in this application; by making the arc radius of the fourth arc segment 1144 1 mm to 3 mm, it is ensured that the first arc segment 1141 can meet the need to increase the flow rate of the electrolyte.
  • the arc radius of the fourth arc segment 1144 can also be less than 1 mm or greater than 3 mm.
  • the arc radius of the first arc segment 1141 and the arc radius of the fourth arc segment 1144 can be the same or different.
  • the curvature of the second arc segment 1142 is ⁇ /3 to ⁇ /2, such as ⁇ /3, 5 ⁇ /12, ⁇ /2, etc. By making the curvature of the second arc segment 1142 ⁇ /3 to ⁇ /2, it is beneficial to provide the flow of the electrolyte at the second arc segment 1142, and to facilitate the formation of the second notch 1132.
  • the curvature of the second arc segment 1142 can also be less than ⁇ /3 or greater than ⁇ /2, and the present application does not limit this.
  • the curvature of the third arc segment 1143 is ⁇ /3 to ⁇ /2, such as ⁇ /3, 5 ⁇ /12, ⁇ /2, etc.
  • the curvature of the second arc segment 1142 can also be less than ⁇ /3 or greater than ⁇ /2, and this application does not limit this.
  • the curvature of the second arc segment 1142 can be the same as or different from the curvature of the first arc segment 1141, the third arc segment 1143, and the fourth arc segment 1144.
  • the arc radius of the second arc segment 1142 is 1 mm to 3 mm, such as 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, etc., which are not listed here in this application; by making the arc radius of the second arc segment 1142 1 mm to 3 mm, it is ensured that the second arc segment 1142 can meet the need of increasing the flow rate of the electrolyte.
  • the arc radius of the second arc segment 1142 can also be less than 1 mm or greater than 3 mm.
  • the arc radius of the third arc segment 1143 is 1mm to 3mm, such as 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, etc., which are not listed here one by one in this application; by making the arc radius of the third arc segment 1143 1mm to 3mm, it is ensured that the second arc segment 1142 can meet the need to increase the flow rate of the electrolyte.
  • the arc radius of the third arc segment 1143 can also be less than 1mm or greater than 3mm.
  • the arc radius of the second arc segment 1142 can be the same as or different from the arc radius of the first arc segment 1141, the third arc segment 1143 and the fourth arc segment 1144.
  • the width of the second notch 1132 is 40% to 60% of the width of the second boss 1122, such as 40%, 45%, 50%, 55%, 60%, etc., which are not listed here in this application. It is ensured that there is enough gap between the second notch 1132 and the second protrusion 1223 to facilitate the flow of electrolyte and facilitate the contact of the welding nozzle on the second connecting piece 122 to form enough avoidance space.
  • the width of the second notch 1132 can also be less than 40% of the width of the second boss 1122 or greater than 60% of the width of the second boss 1122, and this application does not limit this.
  • the length of the lower plastic 112 can be 250mm ⁇ 280mm, for example, 250mm, 260.88mm, 270mm, 280mm, etc.; the width of the lower plastic 112 can be 50mm ⁇ 60mm, for example, 50mm, 52mm, 53mm, 58.08mm, 60mm, etc.; the maximum width of the second boss 1122 is the same as the width of the lower plastic 112, and the thickness of the second boss 1122 can be 2mm ⁇ 3mm, for example, 2.0mm, 2.2mm, 2.58mm, 2.8mm, 3.0mm, etc.; the length of the second boss 1122 can be 15mm ⁇ 25mm, for example, 15mm, 18mm, 20mm, 22mm, 25mm, etc., which is the maximum length of the second boss 1122.
  • the width of the second notch 1132 is 25mm to 30mm, such as 25mm, 26mm, 27mm, 28.13mm, 29mm, 30mm, which are not listed here one by one in this application.
  • the above width is the maximum width of the second notch 1132. It is ensured that there is enough gap between the second notch 1132 and the second protrusion 1223 to facilitate the flow of electrolyte and facilitate the contact of the welding nozzle on the second connecting piece 122 to form enough avoidance space.
  • the width of the second notch 1132 can also be less than 25mm or greater than 30mm, and this application does not limit this.
  • the depth of the second notch 1132 is 20% to 30% of the length of the second boss 1122, such as 20%, 22%, 25%, 28%, 30%, etc., which are not listed here in this application. It is ensured that there is enough gap between the second notch 1132 and the second protrusion 1223 to facilitate the flow of electrolyte and facilitate the contact of the welding nozzle on the second connecting piece 122 to form enough avoidance space.
  • the depth of the second notch 1132 can also be less than 20% of the length of the second boss 1122 or greater than 30% of the length of the second boss 1122, and this application does not limit this.
  • the depth of the second notch 1132 is 3 mm to 6 mm, for example, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, and 6.0 mm, which are not listed here. It is ensured that there is enough clearance between the second notch 1132 and the second protrusion 1223 to facilitate the flow of electrolyte and facilitate the contact of the welding nozzle on the second connecting piece 122 to form enough avoidance space.
  • the depth of the second notch 1132 can also be less than 3 mm or greater than 6 mm, and this application does not limit this.
  • the second boss 1122 is symmetrical about the central axis of the length direction X of the lower plastic 112.
  • the second boss 1122 is a symmetrical structure
  • the second notch 1132 is a symmetrical structure
  • the first arc segment 1141 is symmetrical with the fourth arc segment 1144
  • the second arc segment 1142 is symmetrical with the third arc segment 1143, so that the electrolyte flows evenly from both sides in the width direction Y of the lower plastic 112 into the gap between the second protrusion 1223 and the second notch 1132, thereby further enabling the electrolyte to flow evenly into the bare cell.
  • the second protrusion 1223 includes a top surface facing the second notch 1132 and a first side surface and a second side surface located on both sides of the top surface in the width direction of the second connecting piece 122.
  • the top surface, the first side surface and the second side surface are planes.
  • the top surface is perpendicular to the length direction X of the lower plastic 112.
  • the angle between the first side surface and the second side surface and the top surface is a right angle or an obtuse angle.
  • the orthographic projection of the second protrusion 1223 on the lower plastic 112 is a rectangle; when the angle between the side surface and the top surface of the second protrusion 1223 is an obtuse angle, the orthographic projection of the second protrusion 1223 on the lower plastic 112 is a trapezoid; of course, the angle between the side surface and the top surface of the second protrusion 1223 can also be an acute angle, and the first side surface and the second side surface of the second protrusion 1223 can also be a curved surface or a concave-convex surface, which is not limited in this application.
  • the top surface of the second protrusion 1223 is arranged opposite to the third straight line segment 1147 and has a first preset gap, the first preset gap is 2mm to 5mm, such as 2mm, 3mm, 4mm, 5mm, etc., which are not listed here in this application;
  • the first side surface of the second protrusion 1223 is arranged opposite to the first straight line segment 1145 and has a second preset gap, the second preset gap is 3mm to 10mm, such as 3mm, 5mm, 8mm, 10mm, etc., which are not listed here in this application;
  • the second side surface of the second protrusion 1223 is arranged opposite to the second straight line segment 1146 and has a third preset gap, the third preset gap is 3mm to 10mm, such as 3mm, 5mm, 8mm, 10mm, etc., which are not listed here in this application.
  • the outlet of the first flow channel is formed between the second protrusion 1223 and the second notch 1132, so as to achieve the purpose of the electrolyte flowing into the bare battery cell through the first flow channel.
  • the width of the second protrusion 1223 is 20% to 50% of the width of the second transition portion 1221, for example, 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc., which are not listed here in the present application.
  • the specific width of the second protrusion 1223 can be set according to the specific size of the second connecting piece 122.
  • the second protrusion 1223 By making the width of the second protrusion 1223 20% to 50% of the width of the second transition portion 1221, the second protrusion 1223 can have a sufficient width to facilitate the abutment of the welding nozzle, so that the second protrusion 1223 can provide an additional current flow path; at the same time, it can avoid the second notch 1132 being too wide, resulting in the second boss 1122 being too small in area.
  • the width of the second protrusion 1223 may be less than 20% of the width of the second transition portion 1221 , or the width of the second protrusion 1223 may be greater than 50% of the width of the second transition portion 1221 , and this application does not impose any limitation on this.
  • the length of the second protrusion 1223 is 10% to 30% of the length of the second transition portion 1221, such as 10%, 15%, 20%, 25%, 30%, etc., which are not listed here in the present application.
  • the specific length of the second protrusion 1223 can be set according to the specific size of the second connecting piece 122.
  • the second protrusion 1223 can have a sufficient length, so that the contact of the welding tip is not affected by the welding position of the second pole connecting portion 1224, so that the second protrusion 1223 can provide an additional current flow path; at the same time, it can prevent the second notch 1132 from being too deep in the length direction X of the top cover 111.
  • the second protrusion 1223 is symmetrical about the central axis of the length direction X of the second connecting piece 122, that is, in the width direction Y of the second connecting piece 122, the second protrusion 1223 is located in the middle of the second connecting piece 122.
  • the second pole connecting portion 1224 is located in the middle area of the second transition portion 1221, and the second protrusion 1223 is arranged in the middle of the second connecting piece 122, so that the welding nozzle can abut against the second connecting piece 122.
  • the shape of the second protrusion 1223 matches the shape of the second notch 1132.
  • the orthographic projections of the second protrusion 1223 and the second notch 1132 on the lower plastic 112 are both rectangular, or the orthographic projections of the second protrusion 1223 and the second notch 1132 on the lower plastic 112 are both trapezoidal, etc.
  • the shape of the second protrusion 1223 may not match the shape of the second notch 1132, for example, the second protrusion 1223 is rectangular and the second notch 1132 is semicircular, and the present application does not limit this.
  • first boss 1121 and the second boss 1122 are symmetrically arranged on the top cover 111 , and the shapes and sizes of the first boss 1121 and the second boss 1122 may be completely the same.
  • the first connecting piece 121 is a positive connecting piece, the first pole ear of the bare cell is a positive pole ear, and the first pole column 1151 is a positive pole column; the second connecting piece 122 is a negative connecting piece, the second pole ear of the bare cell is a negative pole ear, and the second pole column 1152 is a negative pole column.
  • the first connecting piece 121 is a negative connecting piece, the first pole ear of the bare cell is a negative pole ear, and the first pole column 1151 is a negative pole column;
  • the second connecting piece 122 is a positive connecting piece, the second pole ear of the bare cell is a positive pole ear, and the second pole column 1152 is a positive pole column.
  • the positive electrode connecting piece may be formed of aluminum material, and the negative electrode connecting piece may be formed of copper material.
  • the first connecting piece 121 and the second connecting piece 122 may be symmetrically arranged on the top cover 111, and the shapes and sizes of the first connecting piece 121 and the second connecting piece 122 may be completely symmetrical.
  • the structure of the first connecting piece 121 may be different from that of the second connecting piece 122, or only the structure of the second protrusion 1223 on the first connecting piece 121 and the structure of the second protrusion 1223 on the second connecting piece 122 may be completely the same.
  • positioning holes or positioning grooves can be respectively set on the first connecting piece 121 and the second connecting piece 122, and a positioning protrusion is set on the lower plastic 112.
  • the first connecting piece 121 and the second connecting piece 122 can be quickly positioned on the lower plastic 112, and at the same time, the position deviation of the first connecting piece 121 and the second connecting piece 122 on the lower plastic 112 can be avoided.
  • the insulating patch 150 is, for example, an insulating tape; of course, the insulating patch 150 may also be other functional films having bonding and insulating functions, and the present application does not impose any limitation on this.
  • an explosion-proof valve 1160 is further provided on the top cover 111 , and the high-temperature and high-pressure gas generated in the shell 140 can be discharged in time through the explosion-proof valve 1160 .
  • the energy storage device provided in the present application may be, for example, a single cell, or a battery module including a plurality of single cells.
  • the embodiment of the present application also provides an electric device, which includes the above-mentioned energy storage device.
  • the electric device can be, for example, a vehicle 20 shown in FIG. 10.
  • a notch is provided on one side of the boss close to the connecting piece, and the insulating patch covers the connecting piece.
  • the tabs and the through holes enable the insulating patch, the connecting sheet and the groove edge to enclose and form a first flow channel for the electrolyte; when the electrolyte is added to the shell through the injection hole, since the insulating patch covers the connecting sheet and the through hole, the electrolyte flows along the gap between the insulating patch and the connecting sheet and the lower plastic, and then the electrolyte can flow out through the notch of the boss and then flow to the electrode assembly, thereby guiding the electrolyte so that the electrolyte can fully flow to various parts of the electrode assembly; the groove edge of the notch is formed by the first arc segment, the second arc segment, the third arc segment and the fourth arc segment, so that the corner of the boss notch is rounded, and when the electrolyte flows through the notch, the flow rate of the electrolyte at the corner of the notch is faster, so that the electrolyte can flow into the electrode assembly faster and more smoothly; at the same time, setting the corner of the
  • connection refers to two or more than two, unless otherwise clearly defined.
  • connection and other terms should be understood in a broad sense.
  • connection can be a fixed connection, a detachable connection, or an integral connection.
  • connection can be a fixed connection, a detachable connection, or an integral connection.
  • an embodiment means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application embodiment.
  • the schematic representation of the above terms does not necessarily refer to the same embodiment or example.
  • the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

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Abstract

一种储能装置及用电设备，储能装置（10）包括：壳体（140）、电极组件（130）、顶盖（111）、下塑胶（112）、连接片（120）和绝缘贴片（150），壳体（140）具有开口，容纳电解液；电极组件（130）容纳于壳体（140）；顶盖（111）盖合于开口，顶盖（111）具有注液孔（1170）；下塑胶（112）设置在顶盖（111）靠近电极组件（130）的一侧，下塑胶（112）上具有通孔（1180），下塑胶（112）包括多个凸台（1120），多个凸台（1120）位于下塑胶（112）朝向电极组件（130）的一侧，通孔（1180）与注液孔（1170）连通；连接片（120）设置在下塑胶（112）朝向电极组件（130）的一侧，在连接片（120）的厚度方向上，至少部分连接片（120）与下塑胶（112）之间具有间隙；绝缘贴片（150）贴设在连接片（120）朝向电极组件（130）的一侧，且覆盖连接片（120）与通孔（1180）；凸台（1120）靠近连接片（120）的一侧设有缺口（113），绝缘贴片（150）、连接片（120）与缺口（113）围合形成电解液的第一流道，电解液进入注液孔（1170）通过第一流道能够流向电极组件（130）。

Description

储能装置及用电设备 技术领域
本申请涉及储能技术领域，具体而言，涉及一种储能装置及用电设备。
背景技术
二次电池(例如锂离子电池)作为常用的储能装置，其具有能量密度高、功率密度高、循环使用次数多、存储时间长等优点，近些年在电动汽车、电动自行车等电动交通工具及储能设施等大中型电动设备方面已被广泛应用。
目前，二次电池中的电芯通常需要加注电解液。
需要说明的是，在上述背景技术部分公开的信息仅用于加强对本申请的背景的理解，因此可以包括不构成对本领域普通技术人员已知的现有技术的信息。
发明内容
本申请的目的在于提供一种储能装置及用电设备，电解液加注时的流动均匀性较好。
根据本申请的第一个方面，提供了一种储能装置，该储能装置包括：
壳体，所述壳体具有开口，容纳电解液；
电极组件，所述电极组件容纳于所述壳体；
顶盖，所述顶盖盖合于所述开口，所述顶盖具有注液孔；
下塑胶，所述下塑胶具有通孔，所述下塑胶设置在所述顶盖靠近所述电极组件的一侧，所述下塑胶包括沿所述下塑胶长度方向上间隔设置的多个凸台，多个凸台至少包括第一凸台和第二凸台，所述第一凸台和所述第二凸台分别位于所述下塑胶长度方向的两端，所述多个凸台位于所述下塑胶朝向所述电极组件的一侧，所述通孔与所述注液孔连通；
连接片，所述连接片设置在所述下塑胶朝向所述电极组件的一侧，在所述连接片的厚度方向上，至少部分所述连接片与所述下塑胶之间具有间隙；
绝缘贴片，所述绝缘贴片贴设在所述连接片朝向所述电极组件的一侧，且覆盖所述连接片与所述通孔；
其中，所述第一凸台和所述第二凸台靠近所述连接片的一侧分别设有缺口，所述绝缘贴片、所述连接片与所述缺口围合形成所述电解液的第一流道，所述电解液进入所述注液孔通过所述第一流道能够流向所述电极组件。
根据本申请的一实施方式，所述缺口包括沿着所述下塑胶宽度方向上依次布置的第一弧线段、第二弧线段、第三弧线段、第四弧线段，所述第一弧线段与所述第二弧线段连接，所述第三弧线段与所述第四弧线段连接，所述第二弧线段与所述第三弧线段连接，所述第一弧线段相对于所述第二弧线段更靠近于所述通孔，第四弧线段相对于所述第三弧线段更靠近于所述通孔，所述第一弧线段、所述第二弧线段、所述第三弧线段与所述第四弧线段构成所述缺口的槽沿。
根据本申请的一实施方式，所述下塑胶在宽度方向的两侧形成有朝向所述电极组件一侧延伸的加强筋，所述连接片与所述加强筋在所述下塑胶的宽度方向上具有间隙，至少部分位于所述连接片上的所述绝缘贴片与所述加强筋在所述下塑胶的宽 度方向上具有间隙；所述绝缘贴片、所述连接片与所述加强筋围合形成所述电解液的第二流道，所述电解液进入所述注液孔通过所述第二流道能够流向所述电极组件。
根据本申请的一实施方式，所述连接片包括极柱连接部、过渡部与两个极耳连接部，所述极柱连接部通过所述过渡部与所述两个极耳连接部连接；所述两个极耳连接部位于所述过渡部背离所述缺口的一侧，且所述两个极耳连接部在所述连接片的宽度方向上间隔分布，所述通孔位于所述两个极耳连接部之间，所述绝缘贴片完全覆盖所述两个极耳连接部之间区域。
根据本申请的一实施方式，所述连接片还包括凸起部，所述凸起部位于所述过渡部朝向所述缺口的一侧，且至少部分所述凸起部位于所述缺口中。
根据本申请的一实施方式，在所述下塑胶的长度方向上，所述过渡部与所述凸台之间具有间隙，所述绝缘贴片覆盖所述间隙。
根据本申请的一实施方式，在所述下塑胶的长度方向上，所述绝缘贴片覆盖所述凸起部与至少部分所述缺口。
根据本申请的一实施方式，至少部分所述绝缘贴片覆盖在所述凸台朝向所述电极组件的一侧上。
根据本申请的一实施方式，所述电极组件包括裸电芯和连接于所述裸电芯上的极耳，所述极耳与所述连接片连接，所述绝缘贴片还完全覆盖所述极耳以及至少部分所述裸电芯。
根据本申请的一实施方式，所述绝缘贴片包括多个子绝缘贴片，相邻的所述子绝缘贴片之间具有重叠区域。
根据本申请的一实施方式，所述缺口还包括：第一直线段、第二直线段和第三直线段中的至少一个，所述第一直线段连接于所述第一弧线段和所述第二弧线段之间，所述第二直线段连接于所述第三弧线段和所述第四弧线段之间，所述第三直线段连接于所述第二弧线段和所述第三弧线段之间。
根据本申请的一实施方式，所述第一弧线段的弧度为π/3～π/2，和/或所述第四弧线段的弧度为π/3～π/2。
根据本申请的一实施方式，所述第一弧线段的圆弧半径为1mm～3mm，和/或所述第四弧线段的圆弧半径为1mm～3mm。
根据本申请的一实施方式，所述第二弧线段的弧度为π/3～π/2，和/或所述第三弧线段的弧度为π/3～π/2。
根据本申请的一实施方式，所述第二弧线段的圆弧半径为1mm～3mm，和/或所述第三弧线段的圆弧半径为1mm～3mm。
根据本申请的一实施方式，在所述下塑胶的宽度方向上，所述缺口的宽度为所述凸台的宽度的40％～60％。
根据本申请的一实施方式，在所述下塑胶的宽度方向上，所述缺口的宽度为25mm～30mm。
根据本申请的一实施方式，在所述下塑胶的长度方向上，所述缺口的深度为所述凸台的长度的20％～30％。
根据本申请的一实施方式，在所述下塑胶的长度方向上，所述缺口的深度为3mm～6mm。
根据本申请的一实施方式，所述缺口还包括：第一直线段、第二直线段和第三直线段，所述第一直线段连接于所述第一弧线段和所述第二弧线段之间，所述第二直线段连接于所述第三弧线段和所述第四弧线段之间，所述第三直线段连接于所述第二弧线段和所述第三弧线段之间；
所述凸起部包括朝向所述缺口的顶面以及在所述连接片的宽度方向上位于所述顶面两侧的第一侧面和第二侧面，所述顶面与所述第三直线段相向设置且具有第一预设间隙，所述第一侧面与所述第一直线段相向设置且具有第二预设间隙，所述第二侧面与所述第二直线段相向设置且具有第三预设间隙；所述第一预设间隙为2mm～5mm，所述第二预设间隙为3mm～10mm，所述第三预设间隙为3mm～10mm。
根据本申请的第二个方面，提供了一种用电设备，该用电设备包括上述的储能装置。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本申请。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本申请的实施例，并与说明书一起用于解释本申请的原理。显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请的一种实施方式提供的储能装置的示意图；
图2为本申请的一种实施方式提供的储能装置的爆炸图；
图3为本申请的一种实施方式提供的电极组件与连接片的连接示意图；
图4为本申请的一种实施方式提供的顶盖的示意图；
图5为本申请的一种实施方式提供的下塑胶与连接片的示意图；
图6为本申请的一种实施方式提供的绝缘贴片与连接片的示意图；
图7为本申请的一种实施方式提供的下塑胶的示意图；
图8为本申请的一种实施方式提供的第一连接片的示意图；
图9为本申请的一种实施方式提供的第二连接片的示意图；
图10为本申请的一种实施方式提供的车辆的示意图。
附图标记说明：
10、储能装置；
111、顶盖；112、下塑胶；1120、凸台；1121、第一凸台；1122、第二凸台；113、缺口；1131、第一缺口；1132、第二缺口；1141、第一弧线段；1142、第二弧线段；1143、第三弧线段；1144、第四弧线段；1145、第一直线段；1146、第二直线段；1147、第三直线段；115、极柱；1151、第一极柱；1152、第二极柱；1160、防爆阀；1170、注液孔；1180、通孔；1190、加强筋；
120、连接片；121、第一连接片；1211、第一过渡部；1212、第一极耳连接部；1213、第一凸起部；1214、第一极柱连接部；122、第二连接片；1221、第二过渡部；1222、第二极耳连接部；1223、第二凸起部；1224、第二极柱连接部；
130、电极组件；1310、第一裸电芯；1311、第一裸电芯第一极耳；1312、第 一裸电芯第二极耳；1320、第二裸电芯；1321、第二裸电芯第一极耳；1322、第二裸电芯第二极耳；
140、壳体；
150、绝缘贴片；151、第一绝缘贴片；152、第二绝缘贴片；
20、车辆。
具体实施方式
现在将参考附图更全面地描述示例实施方式。然而，示例实施方式能够以多种形式实施，且不应被理解为限于在此阐述的实施方式；相反，提供这些实施方式使得本申请将全面和完整，并将示例实施方式的构思全面地传达给本领域的技术人员。图中相同的附图标记表示相同或类似的结构，因而将省略它们的详细描述。
本申请的实施例首先提供了一种储能装置，如图1-图7所示，储能装置10包括：壳体140、电极组件130、顶盖111、下塑胶112、连接片120和绝缘贴片150，壳体140具有开口，容纳电解液，电极组件130容纳于壳体140；顶盖111盖合于壳体140的开口上，顶盖111具有注液孔1170；下塑胶112具有通孔1180，下塑胶112设置在顶盖111靠近电极组件130的一侧，下塑胶112沿下塑胶112长度方向X上间隔设置的多个凸台1120，多个凸台1120至少包括第一凸台1121和第二凸台1122，所述第一凸台1121和第二凸台1122分别位于下塑胶112长度方向X的两端，多个凸台1120位于下塑胶112朝向电极组件130的一侧，通孔1180与注液孔1170连通；连接片120设置在下塑胶112朝向电极组件130的一侧，在连接片120的厚度方向上，至少部分下连接片120与下塑胶112之间具有间隙；绝缘贴片150贴设在连接片120朝向电极组件130的一侧，且覆盖连接片120与通孔1180。
其中，第一凸台1121和第二凸台1122靠近连接片120的一侧设有缺口113，绝缘贴片150、连接片120与缺口113围合形成电解液的第一流道，电解液进入注液孔1170通过第一流道能够流向电极组件130。
本申请提供的储能装置，通过使连接片120与下塑胶112之间具有间隙，凸台1120靠近连接片120的一侧设有缺口113，绝缘贴片150覆盖连接片120与通孔1180，使得绝缘贴片150、连接片120与槽沿围合形成了电解液的第一流道；在通过注液孔1170向壳体140内加注电解液时，由于绝缘贴片150覆盖连接片120与通孔1180，使得电解液沿着绝缘贴片150和连接片120与下塑胶112之间的间隙进行流动，接着电解液可通过凸台1120的缺口113流出，进而流向电极组件130，实现对电解液的导流，使得电解液能够充分的流向电极组件130的各个部分，提升了电极组件130的浸润均匀性。
在本申请的一种实施例中，如图7所示，缺口113包括沿着下塑胶112宽度方向上依次布置的第一弧线段1141、第二弧线段1142、第三弧线段1143、第四弧线段1144，第一弧线段1141与第二弧线段1142连接，第三弧线段1143与第四弧线段1144连接，第二弧线段1142与第三弧线段1143连接，第一弧线段1141相对于第二弧线段1142更靠近于通孔1180，第四弧线段1144相对于第三弧线段1143更 靠近于通孔1180，第一弧线段1141、第二弧线段1142、第三弧线段1143与第四弧线段1144构成缺口113的槽沿。通过第一弧线段1141、第二弧线段1142、第三弧线段1143与第四弧线段1144构成缺口113的槽沿，使得凸台1120缺口113转角为圆角，电解液在流经缺口113时，电解液在缺口113的转角处的流速较快，使得电解液能更快、更顺畅地流入电极组件130；同时，将缺口113的转角设置为圆角，能够避免缺口113的转角划伤极耳，提高了储能装置的可靠性。
具体地，如图2和图3所示，电极组件130包括裸电芯、第一极耳和第二极耳，第一极耳与第二极耳中的一者为正极极耳，另一个者为负极极耳。其中，裸电芯为卷绕式裸电芯，电极组件130包括第一裸电芯1310和第二裸电芯1320，第一裸电芯1310和第二裸电芯1320在厚度方向Z上叠设放置于壳体140中。第一裸电芯1310上连接有第一裸电芯第一极耳1311和第一裸电芯第二极耳1312；第二裸电芯1320上连接有第二裸电芯第一极耳1321和第二裸电芯第二极耳1322。当然，电极组件130也可为一个单体裸电芯，或由三个、四个或更多个单体裸电芯组合形成，本申请对此不做限制。
具体地，如图5-图7所示，在下塑胶112长度方向X的两端，形成有两个凸台1120，即第一凸台1121和第二凸台1122。第一凸台1121上设有第一缺口1131，第二凸台1122上设有第二缺口1132，第一缺口1131与第二缺口1132的开口相向设置。在顶盖111封堵壳体140的开口时，通过第一凸台1121与第二凸台1122伸入开口中，与壳体140开口的侧壁抵接，形成对顶盖111在壳体140的开口上安装的导向和限位，顶盖111可在壳体140上快速定位安装，提高顶盖111与壳体140安装效率；同时通过凸台1120与壳体140内裸电芯抵接，形成对裸电芯的固定。
具体地，如图2-图5所示，顶盖111上设有两个极柱115，即第一极柱1151和第二极柱1152。储能装置10包括两个连接片120，即第一连接片121和第二连接片122，第一连接片121位于靠近第一凸台1121的一侧，第二连接片122位于靠近第二凸台1122的一侧。
下面，本申请中下塑胶112和连接片120的具体结构，分别以第一连接片121与下塑胶112的具体配合结构，及第二连接片122与下塑胶112的具体配合结构进行示例性说明。
在本申请的一种实施例中，如图5-图8所示，第一凸台1121靠近第一连接片121的一侧设有第一缺口1131，第一缺口1131沿着下塑胶112宽度方向Y上依次布置的第一弧线段1141、第二弧线段1142、第三弧线段1143、第四弧线段1144，第一弧线段1141与第二弧线段1142连接，第三弧线段1143与第四弧线段1144连接，第二弧线段1142与第三弧线段1143连接，第一弧线段1141相对于第二弧线段1142更靠近于通孔1180，第四弧线段1144相对于第三弧线段1143更靠近于通孔1180，第一弧线段1141、第二弧线段1142、第三弧线段1143与第四弧线段1144构成第一缺口1131的槽沿；第一绝缘贴片151、第一连接片121与第一槽沿围合形成电解液的第一流道。通过使第一连接片121与下塑胶112之间具有间隙，第一凸台1121靠近第一连接片121的一侧设有第一缺口1131，第一绝缘贴片151覆盖第一连接片121与通孔1180，使得第一绝缘贴片151、第一连接片121与第一槽沿围合形成了电解液的第一流道；在通过注液孔1170向壳体140内加注电解液时， 由于第一绝缘贴片151覆盖第一连接片121与通孔1180，使得电解液沿着第一绝缘贴片151和第一连接片121与下塑胶112之间的间隙进行流动，接着电解液可通过第一凸台1121的第一缺口1131流出，进而流向电极组件130，实现对电解液的导流，使得电解液能够充分的流向电极组件130的各个部分。
其中，下塑胶112在宽度方向Y的两侧形成有朝向电极组件130一侧延伸的加强筋1190，第一连接片121与加强筋1190在下塑胶112的宽度方向上具有间隙，至少部分位于第一过渡部1211上的第一绝缘贴片151与加强筋1190在下塑胶112的宽度方向Y上具有间隙；第一绝缘贴片151、第一连接片121与加强筋1190围合形成电解液的第二流道，电解液进入注液孔1170通过第二流道能够流向电极组件130。通过第一绝缘贴片151、第一连接片121与加强筋1190围合形成电解液的第二流道，在通过注液孔1170向壳体140内加注电解液时，由于第一绝缘贴片151覆盖第一连接片121与通孔1180，使得电解液沿着第一绝缘贴片151和第一连接片121与下塑胶112之间的间隙进行流动，接着电解液可通过第一连接片121与加强筋1190的间隙流出，进而流向电极组件130，实现对电解液的导流，第二流道与第一流道配合，使得电解液能够充分的流向电极组件130的各个部分。
其中，如图5-图8所示，第一连接片121包括第一极柱连接部1214、第一过渡部1211与两个第一极耳连接部1212，第一极柱连接部1214通过第一过渡部1211与两个第一极耳连接部1212连接；两个第一极耳连接部1212位于第一过渡部1211背离第一缺口1131的一侧，且两个第一极耳连接部1212在第一连接片121的宽度方向上间隔分布，通孔1180位于两个第一极耳连接部1212之间，第一绝缘贴片151完全覆盖两个第一极耳连接部1212之间区域。通过使通孔1180位于两个第一极耳连接部1212之间，第一绝缘贴片151完全覆盖两个第一极耳连接部1212之间区域，使得经通孔1180流入的电解液在第一绝缘贴片151的导流作用下，朝向第一连接片121与下塑胶112之间的间隙流动，进而实现通过第一流道和第二流道流入电极组件130中。
进一步地，如图5和图8所示，第一连接片121还包括第一凸起部1213，第一凸起部1213位于第一过渡部1211朝向第一缺口1131的一侧，且至少部分第一凸起部1213位于第一缺口1131中。通过设置第一凸起部1213，在第一连接片121通过第一极柱连接部1214与第一极柱1151激光焊接时，通过第一凸起部1213便于激光焊接的焊嘴(铜嘴)抵住第一连接片121上设有第一凸起部1213一侧的侧边，通过第一缺口1131给焊嘴抵住第一凸起部1213提供了避让空间，提升了第一连接片121与第一极柱1151激光焊接的稳定性，提高了第一连接片121与第一极柱1151激光焊接的效率和良率；在第一连接片121与第一极柱1151连接通电后，第一凸起部1213可以在电流过大时提供额外的电流流通路径，提高了第一连接片121的载流能力，从而提高了储能装置的稳定性和安全性。
其中，如图5和图6所示，在下塑胶112的长度方向X上，第一过渡部1211与第一凸台1121之间具有间隙，第一绝缘贴片151覆盖间隙。通过在第一过渡部1211与第一凸台1121之间具有间隙，并使第一绝缘贴片151覆盖间隙，使得第一流道的电解液均通过第一缺口1131流入电极组件130中；此外，第一绝缘贴片151覆盖间隙时至少部分第一绝缘贴片151覆盖在第一凸台1121的边沿上，能够避免 第一凸台1121的边沿对极耳造成划伤。
其中，如图6所示，在下塑胶112的长度方向X上，第一绝缘贴片151覆盖第一凸起部1213与至少部分第一缺口1131。通过第一绝缘贴片151覆盖第一凸起，第一绝缘贴片151完全覆盖第一连接片121，从而形成第一连接片121的绝缘作用，避免第一连接片121与裸电芯中的极片接触导致出现短路；同时，通过使第一绝缘贴片151膜覆至少部分第一缺口1131，使得电解液需经过第一弧线段1141与第四弧线段1144从第一缺口1131流出，通过第一弧线段1141与第四弧线段1144相对提高了电解液的流速。
其中，如图6所示，至少部分第一绝缘贴片151覆盖在第一凸台1121朝向电极组件130的一侧上。通过使至少部分第一绝缘贴片151覆盖在第一凸台1121朝向电极组件130的一侧上，使得第一绝缘贴片151在覆盖第一过渡部1211与第一凸台1121之间具有间隙以及部分第一缺口1131时，提高了第一绝缘贴片151的粘接力，避免第一绝缘贴片151脱落。
其中，第一绝缘贴片151还覆盖与第一极耳连接部1212连接的第一裸电芯第一极耳1311和至少部分第一裸电芯1310，以及第二裸电芯第一极耳1321和至少部分第二裸电芯1320。通过使第一绝缘贴片151还覆盖与第一极耳连接部1212连接的第一裸电芯第一极耳1311和至少部分第一裸电芯1310，以及第二裸电芯第一极耳1321和至少部分第二裸电芯1320，使得第一绝缘贴片151完全覆盖第一连接片121与第一裸电芯第一极耳1311及第二裸电芯第一极耳1321，避免焊渣掉入裸电芯中造成短路，同时还提高了第一极耳连接部1212与第一裸电芯第一极耳1311及第二裸电芯第一极耳1321焊接后的稳定性。
其中，第一绝缘贴片151由多个子绝缘贴片连接形成，多个子绝缘贴片分别覆盖第一连接片121、第一裸电芯1310、第一裸电芯第一极耳1311、第二裸电芯1320及第二裸电芯第一极耳1321的不同区域，相邻的子绝缘贴片之间具有重叠区域，降低了第一绝缘贴片151粘接时的工艺难度，提高了第一绝缘贴片151在不同区域的粘接强度，同时还降低了第一绝缘贴片151的制造难度与成本。
其中，第一缺口1131还包括：第一直线段1145、第二直线段1146和第三直线段1147中的至少一个，第一直线段1145连接于第一弧线段1141和第二弧线段1142之间，第二直线段1146连接于第三弧线段1143和第四弧线段1144之间，第三直线段1147连接于第二弧线段1142和第三弧线段1143之间。通过第一直线段1145连接于第一弧线段1141和第二弧线段1142之间，第二直线段1146连接于第三弧线段1143和第四弧线段1144之间，第三直线段1147连接于第二弧线段1142和第三弧线段1143之间，使得第一缺口1131的转角为圆角，从而提高电解液流经的流速。
其中，第一直线段1145与第三直线段1147之间的夹角为钝角。通过使第一直线段1145与第三直线段1147之间的夹角为钝角，即使得第一缺口1131的开口相对变大，从而进一步便于电解液流入第一凸起部1213与第一缺口1131之间的间隙，且使得第一直线段1145与第三直线段1147的转角弧度能够增大，能够使电解液在第一直线段1145与第三直线段1147处的流速进一步提高，使得电解液能更快地流入电极组件130。当然，第一直线段1145与第三直线段1147之间的夹角也可为直 角。
其中，第二直线段1146与第三直线段1147之间的夹角为钝角。通过使第二直线段1146与第三直线段1147之间的夹角为钝角，即使得第一缺口1131的开口相对变大，从而进一步便于电解液流入第一凸起部1213与第一缺口1131之间的间隙，且使得第二直线段1146与第三直线段1147的转角弧度能够增大，能够使电解液在第二直线段1146与第三直线段1147处的流速进一步提高，使得电解液能更快地流入电极组件130。当然，第二直线段1146与第三直线段1147之间的夹角也可为直角。
其中，第一弧线段1141的弧度为π/3～π/2，例如π/3、5π/12、π/2等。通过使第一弧线段1141的弧度为π/3～π/2，有利于提供电解液在第一弧线段1141处的流动，便于第一缺口1131的形成。当然，第一弧线段1141的弧度也可小于π/3或大于π/2，本申请对此不做限制。
其中，第四弧线段1144的弧度为π/3～π/2，例如π/3、5π/12、π/2等。通过使第一弧线段1141的弧度为π/3～π/2，有利于提供电解液在第四弧线段1144处的流动，便于第一缺口1131的形成。当然，第四弧线段1144的弧度也可小于π/3或大于π/2，本申请对此不做限制。其中，第一弧线段1141的弧度与第四弧线段1144的弧度可相同或不同。
其中，第一弧线段1141的圆弧半径为1mm～3mm，例如1.0mm、1.5mm、2.0mm、2.5mm、3.0mm等，本申请在此不一一列举；通过使第一弧线段1141的圆弧半径为1mm～3mm，保证第一弧线段1141能够满足提高电解液流速的需要。当然，第一弧线段1141的圆弧半径也可小于1mm或大于3mm。
其中，第四弧线段1144的圆弧半径为1mm～3mm，例如1.0mm、1.5mm、2.0mm、2.5mm、3.0mm等，本申请在此不一一列举；通过使第四弧线段1144的圆弧半径为1mm～3mm，保证第一弧线段1141能够满足提高电解液流速的需要。当然，第四弧线段1144的圆弧半径也可小于1mm或大于3mm。其中，第一弧线段1141的圆弧半径与第四弧线段1144的圆弧半径可相同或不同。
其中，第二弧线段1142的弧度为π/3～π/2，例如π/3、5π/12、π/2等。通过使第二弧线段1142的弧度为π/3～π/2，有利于提供电解液在第二弧线段1142处的流动，便于第一缺口1131的形成。当然，第二弧线段1142的弧度也可小于π/3或大于π/2，本申请对此不做限制。
其中，第三弧线段1143的弧度为π/3～π/2，例如π/3、5π/12、π/2等。通过使第二弧线段1142的弧度为π/3～π/2，有利于提供电解液在第三弧线段1143处的流动，便于第一缺口1131的形成。当然，第三弧线段1143的弧度也可小于π/3或大于π/2，本申请对此不做限制。其中，第二弧线段1142的弧度与第一弧线段1141、第三弧线段1143和第四弧线段1144的弧度可相同或不同。
其中，第二弧线段1142的圆弧半径为1mm～3mm，例如1.0mm、1.5mm、2.0mm、2.5mm、3.0mm等，本申请在此不一一列举；通过使第二弧线段1142的圆弧半径为1mm～3mm，保证第二弧线段1142能够满足提高电解液流速的需要。当然，第二弧线段1142的圆弧半径也可小于1mm或大于3mm。
其中，第三弧线段1143的圆弧半径为1mm～3mm，例如1.0mm、1.5mm、 2.0mm、2.5mm、3.0mm等，本申请在此不一一列举；通过使第三弧线段1143的圆弧半径为1mm～3mm，保证第二弧线段1142能够满足提高电解液流速的需要。当然，第三弧线段1143的圆弧半径也可小于1mm或大于3mm。其中，第二弧线段1142的圆弧半径与第一弧线段1141、第三弧线段1143和第四弧线段1144的圆弧半径可相同或不同。
其中，在下塑胶112的宽度方向上，第一缺口1131的宽度为第一凸台1121的宽度的40％～60％，例如40％、45％、50％、55％、60％等，本申请在此不一一列举。保证第一缺口1131与第一凸起部1213之间具有足够的间隙，便于电解液的流动，同时便于焊嘴在第一连接片121上的抵接，形成足够的避让空间。当然，第一缺口1131的宽度也可小于第一凸台1121的宽度的40％或大于第一凸台1121的宽度的60％，本申请对此不做限制。
其中，下塑胶112的长度可为250mm～280mm，例如250mm、260.88mm、270mm、280mm等；下塑胶112的宽度可为50mm～60mm，例如50mm、52mm、53mm、58.08mm、60mm等；第一凸台1121的最大宽度与下塑胶112的宽度相同，第一凸台1121的厚度可为2mm～3mm，例如2.0mm、2.2mm、2.58mm、2.8mm、3.0mm等；第一凸台1121的长度可为15mm～25mm，例如15mm、18mm、20mm、22mm、25mm等，该长度为第一凸台1121的最大长度。
其中，第一缺口1131的宽度为25mm～30mm，例如25mm、26mm、27mm、28.13mm、29mm、30mm，本申请在此不一一列举，当第一缺口1131在深度方向上为非等宽结构时，上述宽度为第一缺口1131的最大宽度。保证第一缺口1131与第一凸起部1213之间具有足够的间隙，便于电解液的流动，同时便于焊嘴在第一连接片121上的抵接，形成足够的避让空间。当然，第一缺口1131的宽度也可小于25mm或大于30mm，本申请对此不做限制。
其中，在下塑胶112的长度方向X上，第一缺口1131的深度为第一凸台1121的长度的20％～30％，例如20％、22％、25％、28％、30％等，本申请在此不一一列举。保证第一缺口1131与第一凸起部1213之间具有足够的间隙，便于电解液的流动，同时便于焊嘴在第一连接片121上的抵接，形成足够的避让空间。当然，第一缺口1131的深度也可小于第一凸台1121的长度的20％或大于第一凸台1121长度的30％，本申请对此不做限制。
其中，第一缺口1131的深度为3mm～6mm，例如3.0mm、3.5mm、4.0mm、4.5mm、5.0mm、5.5mm、6.0mm，本申请在此不一一列举。保证第一缺口1131与第一凸起部1213之间具有足够的间隙，便于电解液的流动，同时便于焊嘴在第一连接片121上的抵接，形成足够的避让空间。当然，第一缺口1131的深度也可小于3mm或大于6mm，本申请对此不做限制。
示例的，第一凸台1121关于下塑胶112的长度方向X的中轴线对称。通过使第一凸台1121关于顶盖111的长度方向X的中轴线对称，则第一凸台1121为对称结构，第一缺口1131为对称结构，第一弧线段1141与第四弧线段1144对称，第二弧线段1142与第三弧线段1143对称，使得电解液从下塑胶112宽度方向Y上的两侧均匀地流入到第一凸起部1213与第一缺口1131之间的间隙中，从而进一步使得电解液能够均匀地流入裸电芯。
其中，第一凸起部1213包括朝向第一缺口1131的顶面以及在第一连接片121的宽度方向上位于顶面两侧的第一侧面和第二侧面，顶面、第一侧面和第二侧面为平面，顶面与下塑胶112的长度方向X垂直，第一侧面和第二侧面与顶面之间的夹角为直角或钝角。当第一凸起部1213的侧面与顶面之间的夹角为直角，第一凸起部1213在下塑胶112上的正投影均呈矩形；当第一凸起部1213的侧面与顶面之间的夹角为钝角，第一凸起部1213在下塑胶112上的正投影均呈梯形；当然，第一凸起部1213的侧面与顶面之间的夹角也可为锐角，第一凸起部1213的第一侧面和第二侧面为也可为弧面或凹凸面，本申请对此不做限制。
其中，第一凸起部1213的顶面与第三直线段1147相向设置且具有第一预设间隙，第一预设间隙为2mm～5mm，例如2mm、3mm、4mm、5mm等，本申请在此不一一列举；第一凸起部1213的第一侧面与第一直线段1145相向设置且具有第二预设间隙，第二预设间隙为3mm～10mm，例如3mm、5mm、8mm、10mm等，本申请在此不一一列举；第一凸起部1213的第二侧面与第二直线段1146相向设置且具有第三预设间隙，第三预设间隙为3mm～10mm，例如3mm、5mm、8mm、10mm等，本申请在此不一一列举。通过使第一凸起部1213与第一缺口1131相向的侧壁之间具有预设间隙，在第一凸起部1213与第一缺口1131之间形成第一流道的出口，实现电解液通过第一流道流入裸电芯的目的。
其中，在第一连接片121的宽度方向Y上，第一凸起部1213的宽度为第一过渡部1211宽度的20％～50％，例如20％、25％、30％、35％、40％、45％、50％等，本申请在此不一一列举，第一凸起部1213的具体宽度可根据第一连接片121的具体大小进行设定。通过使第一凸起部1213的宽度为第一过渡部1211宽度的20％～50％，能够使第一凸起部1213具有足够的宽度，便于焊嘴的抵接，使得第一凸起部1213能够提供额外的电流流通路径；同时能够避免第一缺口1131的过宽，导致第一凸台1121的面积过小。当然，第一凸起部1213的宽度也可小于第一过渡部1211宽度的20％，或第一凸起部1213的宽度大于第一过渡部1211宽度的50％，本申请对此不做限制。
其中，在第一连接片121的长度方向X上，第一凸起部1213的长度为第一过渡部1211长度的10％～30％，例如10％、15％、20％、25％、30％等，本申请在此不一一列举，第一凸起部1213的具体长度可根据第一连接片121的具体大小进行设定。通过使第一凸起部1213的长度为第一过渡部1211长度的10％～30％，能够使第一凸起部1213具有足够的长度，便于焊嘴的抵接不受第一极柱连接部1214焊接位置的影响，使得第一凸起部1213能够提供额外的电流流通路径；同时能够避免第一缺口1131在顶盖111的长度方向X上过深。
其中，第一凸起部1213关于第一连接片121的长度方向X的中轴线对称，即在第一连接片121的宽度方向Y上，第一凸起部1213位于第一连接片121的中间位置。第一极柱连接部1214位于第一过渡部1211的中间区域，将第一凸起部1213设于第一连接片121的中间位置，便于焊嘴抵接在第一连接片121上。
其中，第一凸起部1213的形状与第一缺口1131的形状匹配。例如，第一凸起部1213与第一缺口1131在下塑胶112上的正投影均呈矩形，或第一凸起部1213与第一缺口1131在下塑胶112上的正投影均呈梯形等。当然，第一凸起部1213的 形状与第一缺口1131的形状也可不匹配，例如第一凸起部1213呈矩形，第一缺口1131呈半圆形，本申请对此不做限制。
在本申请的一种实施例中，如图5-图7、图9所示，第二凸台1122靠近第二连接片122的一侧设有第二缺口1132，第二缺口1132沿着下塑胶112宽度方向Y上依次布置的第一弧线段1141、第二弧线段1142、第三弧线段1143、第四弧线段1144，第一弧线段1141与第二弧线段1142连接，第三弧线段1143与第四弧线段1144连接，第二弧线段1142与第三弧线段1143连接，第一弧线段1141相对于第二弧线段1142更靠近于通孔1180，第四弧线段1144相对于第三弧线段1143更靠近于注液孔1170，第一弧线段1141、第二弧线段1142、第三弧线段1143与第四弧线段1144构成第二缺口1132的第二槽沿；第二绝缘贴片152、第二连接片122与第二槽沿围合形成电解液的第一流道。通过使第二连接片122与下塑胶112之间具有间隙，第二凸台1122靠近第二连接片122的一侧设有第二缺口1132，第二绝缘贴片152覆盖第二连接片122，使得第二绝缘贴片152、第二连接片122与第二槽沿围合形成了电解液的第一流道；在通过注液孔1170向壳体140内加注电解液时，部分电解液可沿着第二绝缘贴片152和第二连接片122与下塑胶112之间的间隙进行流动，接着电解液可通过第二凸台1122的第二缺口1132流出，进而流向电极组件130，实现对电解液的导流，使得电解液能够充分的流向电极组件130的各个部分。
其中，下塑胶112在宽度方向Y的两侧形成有朝向电极组件130一侧延伸的加强筋1190，第二连接片122与加强筋1190在下塑胶112的宽度方向Y上具有间隙，至少部分位于第二过渡部1221上的第二绝缘贴片152与加强筋1190在下塑胶112的宽度方向Y上具有间隙；第二绝缘贴片152、第二连接片122与加强筋1190围合形成电解液的第二流道，电解液进入注液孔1170通过第二流道能够流向电极组件130。通过第二绝缘贴片152、第二连接片122与加强筋1190围合形成电解液的第二流道，在通过注液孔1170向壳体140内加注电解液时，由于第二绝缘贴片152覆盖第二连接片122，使得部分电解液沿着第二绝缘贴片152和第二连接片122与下塑胶112之间的间隙进行流动，接着电解液可通过第二连接片122与加强筋1190的间隙流出，进而流向电极组件130，实现对电解液的导流，第二流道与第一流道配合，使得电解液能够充分的流向电极组件130的各个部分。
其中，如图5和图9所示，第二连接片122包括第二极柱连接部1224、第二过渡部1221与两个第二极耳连接部1222，第二极柱连接部1224通过第二过渡部1221与两个第二极耳连接部1222连接；第二极耳连接部1222位于第二过渡部1221背离第二缺口1132的一侧，且两个第二极耳连接部1222在第二连接片122的宽度方向Y上间隔分布，第二绝缘贴片152完全覆盖两个第二极耳连接部1222之间区域。通过第二绝缘贴片152完全覆盖两个第二极耳连接部1222之间区域，使得经通孔1180流入的部分电解液在第二绝缘贴片152的导流作用下，朝向第二连接片122与下塑胶112之间的间隙流动，进而实现通过第一流道和第二流道流入电极组件130中。
进一步地，如图5和9所示，第二连接片122还包括第二凸起部1223，第二凸起部1223位于第二过渡部1221朝向第二缺口1132的一侧，且至少部分第二凸 起部1223位于第二缺口1132中。通过设置第二凸起部1223，在第二连接片122通过第二极柱连接部1224与第二极柱1152激光焊接时，通过第二凸起部1223便于激光焊接的焊嘴抵住第二连接片122上设有第二凸起部1223一侧的侧边，通过第二缺口1132给焊嘴抵住第二凸起部1223提供了避让空间，提升了第二连接片122与第二极柱1152激光焊接的稳定性，提高了第二连接片122与第二极柱1152激光焊接的效率和良率；在第二连接片122与第二极柱1152连接通电后，第二凸起部1223可以在电流过大时提供额外的电流流通路径，提高了第二连接片122的载流能力，从而提高了储能装置的稳定性和安全性。
其中，如图5和图6所示，在下塑胶112的长度方向X上，第二过渡部1221与第二凸台1122之间具有间隙，第二绝缘贴片152覆盖间隙。通过在第二过渡部1221与第二凸台1122之间具有间隙，并使第二绝缘贴片152覆盖间隙，使得第一流道的电解液均通过第二缺口1132流入电极组件130中；此外，第二绝缘贴片152覆盖间隙时至少部分第二绝缘贴片152覆盖在第二凸台1122的边沿上，能够避免第二凸台1122的边沿对第二极耳造成划伤。
其中，如图6所示，在下塑胶112的长度方向X上，第二绝缘贴片152覆盖第二凸起部1223与至少部分第二缺口1132。通过第二绝缘贴片152覆盖第二凸起部1223，第二绝缘贴片152完全覆盖第二连接片122，从而形成第二连接片122的绝缘作用，避免第二连接片122与裸电芯中的极片接触导致出现短路；同时，通过使第二绝缘贴片152膜覆至少部分第二缺口1132，使得电解液需经过第一弧线段1141与第四弧线段1144从第二缺口1132流出，通过第一弧线段1141与第四弧线段1144相对提高了电解液的流速。
其中，如图6所示，至少部分第二绝缘贴片152覆盖在第二凸台1122朝向电极组件130的一侧上。通过使至少部分第二绝缘贴片152覆盖在第二凸台1122朝向电极组件130的一侧上，使得第二绝缘贴片152在覆盖第二过渡部1221与第二凸台1122之间具有间隙以及部分第二缺口1132时，提高了第二绝缘贴片152的粘接力，避免第二绝缘贴片152脱落。
其中，第二绝缘贴片152还覆盖与第二极耳连接部1222连接的第一裸电芯第二极耳1312和至少部分第一裸电芯1310，以及第二裸电芯第二极耳1322和至少部分第二裸电芯1320。通过使第二绝缘贴片152还覆盖与第二极耳连接部1222连接的第一裸电芯第二极耳1312和至少部分第一裸电芯1310，以及第二裸电芯第二极耳1322和至少部分第二裸电芯1320，使得第二绝缘贴片152完全覆盖第二连接片122与第一裸电芯第二极耳1312及第二裸电芯第二极耳1322，避免焊渣掉入裸电芯中造成短路，同时还提高了第一极耳连接部1212与第一裸电芯第二极耳1312及第二裸电芯第二极耳1322焊接后的稳定性。
其中，第二绝缘贴片152由多个子绝缘贴片连接形成，多个子绝缘贴片分别覆盖第二连接片122、第一裸电芯1310、第一裸电芯第二极耳1312、第二裸电芯1320及第二裸电芯第二极耳1322的不同区域，相邻的子绝缘贴片之间具有重叠区域，降低了第二绝缘贴片152粘接时的工艺难度，提高了第二绝缘贴片152在不同区域的粘接强度，同时还降低了第二绝缘贴片152的制造难度与成本。
其中，第二缺口1132还包括：第一直线段1145、第二直线段1146和第三直线 段1147中的至少一个，第一直线段1145连接于第一弧线段1141和第二弧线段1142之间，第二直线段1146连接于第三弧线段1143和第四弧线段1144之间，第三直线段1147连接于第二弧线段1142和第三弧线段1143之间。通过第一直线段1145连接于第一弧线段1141和第二弧线段1142之间，第二直线段1146连接于第三弧线段1143和第四弧线段1144之间，第三直线段1147连接于第二弧线段1142和第三弧线段1143之间，使得第二缺口1132的转角为圆角，从而提高电解液流经的流速。
其中，第一直线段1145与第三直线段1147之间的夹角为钝角。通过使第一直线段1145与第三直线段1147之间的夹角为钝角，即使得第二缺口1132的开口相对变大，从而进一步便于电解液流入第二凸起部1223与第二缺口1132之间的间隙，且使得第一直线段1145与第三直线段1147的转角弧度能够增大，能够使电解液在第一直线段1145与第三直线段1147处的流速进一步提高，使得电解液能更快地流入电极组件130。当然，第一直线段1145与第三直线段1147之间的夹角也可为直角。
其中，第二直线段1146与第三直线段1147之间的夹角为钝角。通过使第二直线段1146与第三直线段1147之间的夹角为钝角，即使得第二缺口1132的开口相对变大，从而进一步便于电解液流入第二凸起部1223与第二缺口1132之间的间隙，且使得第二直线段1146与第三直线段1147的转角弧度能够增大，能够使电解液在第二直线段1146与第三直线段1147处的流速进一步提高，使得电解液能更快地流入电极组件130。当然，第二直线段1146与第三直线段1147之间的夹角也可为直角。
其中，第一弧线段1141的弧度为π/3～π/2，例如π/3、5π/12、π/2等。通过使第一弧线段1141的弧度为π/3～π/2，有利于提供电解液在第一弧线段1141处的流动，便于第二缺口1132的形成。当然，第一弧线段1141的弧度也可小于π/3或大于π/2，本申请对此不做限制。
其中，第四弧线段1144的弧度为π/3～π/2，例如π/3、5π/12、π/2等。通过使第一弧线段1141的弧度为π/3～π/2，有利于提供电解液在第四弧线段1144处的流动，便于第二缺口1132的形成。当然，第四弧线段1144的弧度也可小于π/3或大于π/2，本申请对此不做限制。其中，第一弧线段1141的弧度与第四弧线段1144的弧度可相同或不同。
其中，第一弧线段1141的圆弧半径为1mm～3mm，例如1.0mm、1.5mm、2.0mm、2.5mm、3.0mm等，本申请在此不一一列举；通过使第一弧线段1141的圆弧半径为1mm～3mm，保证第一弧线段1141能够满足提高电解液流速的需要。当然，第一弧线段1141的圆弧半径也可小于1mm或大于3mm。
其中，第四弧线段1144的圆弧半径为1mm～3mm，例如1.0mm、1.5mm、2.0mm、2.5mm、3.0mm等，本申请在此不一一列举；通过使第四弧线段1144的圆弧半径为1mm～3mm，保证第一弧线段1141能够满足提高电解液流速的需要。当然，第四弧线段1144的圆弧半径也可小于1mm或大于3mm。其中，第一弧线段1141的圆弧半径与第四弧线段1144的圆弧半径可相同或不同。
其中，第二弧线段1142的弧度为π/3～π/2，例如π/3、5π/12、π/2等。通 过使第二弧线段1142的弧度为π/3～π/2，有利于提供电解液在第二弧线段1142处的流动，便于第二缺口1132的形成。当然，第二弧线段1142的弧度也可小于π/3或大于π/2，本申请对此不做限制。
其中，第三弧线段1143的弧度为π/3～π/2，例如π/3、5π/12、π/2等。通过使第二弧线段1142的弧度为π/3～π/2，有利于提供电解液在第三弧线段1143处的流动，便于第二缺口1132的形成。当然，第三弧线段1143的弧度也可小于π/3或大于π/2，本申请对此不做限制。其中，第二弧线段1142的弧度与第一弧线段1141、第三弧线段1143和第四弧线段1144的弧度可相同或不同。
其中，第二弧线段1142的圆弧半径为1mm～3mm，例如1.0mm、1.5mm、2.0mm、2.5mm、3.0mm等，本申请在此不一一列举；通过使第二弧线段1142的圆弧半径为1mm～3mm，保证第二弧线段1142能够满足提高电解液流速的需要。当然，第二弧线段1142的圆弧半径也可小于1mm或大于3mm。
其中，第三弧线段1143的圆弧半径为1mm～3mm，例如1.0mm、1.5mm、2.0mm、2.5mm、3.0mm等，本申请在此不一一列举；通过使第三弧线段1143的圆弧半径为1mm～3mm，保证第二弧线段1142能够满足提高电解液流速的需要。当然，第三弧线段1143的圆弧半径也可小于1mm或大于3mm。其中，第二弧线段1142的圆弧半径与第一弧线段1141、第三弧线段1143和第四弧线段1144的圆弧半径可相同或不同。
其中，在下塑胶112的宽度方向上，第二缺口1132的宽度为第二凸台1122的宽度的40％～60％，例如40％、45％、50％、55％、60％等，本申请在此不一一列举。保证第二缺口1132与第二凸起部1223之间具有足够的间隙，便于电解液的流动，同时便于焊嘴在第二连接片122上的抵接，形成足够的避让空间。当然，第二缺口1132的宽度也可小于第二凸台1122的宽度的40％或大于第二凸台1122的宽度的60％，本申请对此不做限制。
其中，下塑胶112的长度可为250mm～280mm，例如250mm、260.88mm、270mm、280mm等；下塑胶112的宽度可为50mm～60mm，例如50mm、52mm、53mm、58.08mm、60mm等；第二凸台1122的最大宽度与下塑胶112的宽度相同，第二凸台1122的厚度可为2mm～3mm，例如2.0mm、2.2mm、2.58mm、2.8mm、3.0mm等；第二凸台1122的长度可为15mm～25mm，例如15mm、18mm、20mm、22mm、25mm等，该长度为第二凸台1122的最大长度。
其中，第二缺口1132的宽度为25mm～30mm，例如25mm、26mm、27mm、28.13mm、29mm、30mm，本申请在此不一一列举，当第二缺口1132在深度方向上为非等宽结构时，上述宽度为第二缺口1132的最大宽度。保证第二缺口1132与第二凸起部1223之间具有足够的间隙，便于电解液的流动，同时便于焊嘴在第二连接片122上的抵接，形成足够的避让空间。当然，第二缺口1132的宽度也可小于25mm或大于30mm，本申请对此不做限制。
其中，在下塑胶112的长度方向X上，第二缺口1132的深度为第二凸台1122的长度的20％～30％，例如20％、22％、25％、28％、30％等，本申请在此不一一列举。保证第二缺口1132与第二凸起部1223之间具有足够的间隙，便于电解液的流动，同时便于焊嘴在第二连接片122上的抵接，形成足够的避让空间。当然，第 二缺口1132的深度也可小于第二凸台1122的长度的20％或大于第二凸台1122长度的30％，本申请对此不做限制。
其中，第二缺口1132的深度为3mm～6mm，例如3.0mm、3.5mm、4.0mm、4.5mm、5.0mm、5.5mm、6.0mm，本申请在此不一一列举。保证第二缺口1132与第二凸起部1223之间具有足够的间隙，便于电解液的流动，同时便于焊嘴在第二连接片122上的抵接，形成足够的避让空间。当然，第二缺口1132的深度也可小于3mm或大于6mm，本申请对此不做限制。
其中，第二凸台1122关于下塑胶112的长度方向X的中轴线对称。通过使第二凸台1122关于顶盖111的长度方向X的中轴线对称，则第二凸台1122为对称结构，第二缺口1132为对称结构，第一弧线段1141与第四弧线段1144对称，第二弧线段1142与第三弧线段1143对称，使得电解液从下塑胶112宽度方向Y上的两侧均匀地流入到第二凸起部1223与第二缺口1132之间的间隙中，从而进一步使得电解液能够均匀地流入裸电芯。
其中，第二凸起部1223包括朝向第二缺口1132的顶面以及在第二连接片122的宽度方向上位于顶面两侧的第一侧面和第二侧面，顶面、第一侧面和第二侧面为平面，顶面与下塑胶112的长度方向X垂直，第一侧面和第二侧面与顶面之间的夹角为直角或钝角。当第二凸起部1223的侧面与顶面之间的夹角为直角，第二凸起部1223在下塑胶112上的正投影均呈矩形；当第二凸起部1223的侧面与顶面之间的夹角为钝角，第二凸起部1223在下塑胶112上的正投影均呈梯形；当然，第二凸起部1223的侧面与顶面之间的夹角也可为锐角，第二凸起部1223的第一侧面和第二侧面为也可为弧面或凹凸面，本申请对此不做限制。
其中，第二凸起部1223的顶面与第三直线段1147相向设置且具有第一预设间隙，第一预设间隙为2mm～5mm，例如2mm、3mm、4mm、5mm等，本申请在此不一一列举；第二凸起部1223的第一侧面与第一直线段1145相向设置且具有第二预设间隙，第二预设间隙为3mm～10mm，例如3mm、5mm、8mm、10mm等，本申请在此不一一列举；第二凸起部1223的第二侧面与第二直线段1146相向设置且具有第三预设间隙，第三预设间隙为3mm～10mm，例如3mm、5mm、8mm、10mm等，本申请在此不一一列举。通过使第二凸起部1223与第二缺口1132相向的侧壁之间具有预设间隙，在第二凸起部1223与第二缺口1132之间形成第一流道的出口，实现电解液通过第一流道流入裸电芯的目的。
其中，在第二连接片122的宽度方向Y上，第二凸起部1223的宽度为第二过渡部1221宽度的20％～50％，例如20％、25％、30％、35％、40％、45％、50％等，本申请在此不一一列举，第二凸起部1223的具体宽度可根据第二连接片122的具体大小进行设定。通过使第二凸起部1223的宽度为第二过渡部1221宽度的20％～50％，能够使第二凸起部1223具有足够的宽度，便于焊嘴的抵接，使得第二凸起部1223能够提供额外的电流流通路径；同时能够避免第二缺口1132的过宽，导致第二凸台1122的面积过小。当然，第二凸起部1223的宽度也可小于第二过渡部1221宽度的20％，或第二凸起部1223的宽度大于第二过渡部1221宽度的50％，本申请对此不做限制。
其中，在第二连接片122的长度方向X上，第二凸起部1223的长度为第二过 渡部1221长度的10％～30％，例如10％、15％、20％、25％、30％等，本申请在此不一一列举，第二凸起部1223的具体长度可根据第二连接片122的具体大小进行设定。通过使第二凸起部1223的长度为第二过渡部1221长度的10％～30％，能够使第二凸起部1223具有足够的长度，便于焊嘴的抵接不受第二极柱连接部1224焊接位置的影响，使得第二凸起部1223能够提供额外的电流流通路径；同时能够避免第二缺口1132在顶盖111的长度方向X上过深。
其中，第二凸起部1223关于第二连接片122的长度方向X的中轴线对称，即在第二连接片122的宽度方向Y上，第二凸起部1223位于第二连接片122的中间位置。第二极柱连接部1224位于第二过渡部1221的中间区域，将第二凸起部1223设于第二连接片122的中间位置，便于焊嘴抵接在第二连接片122上。
其中，第二凸起部1223的形状与第二缺口1132的形状匹配。例如，第二凸起部1223与第二缺口1132在下塑胶112上的正投影均呈矩形，或第二凸起部1223与第二缺口1132在下塑胶112上的正投影均呈梯形等。当然，第二凸起部1223的形状与第二缺口1132的形状也可不匹配，例如第二凸起部1223呈矩形，第二缺口1132呈半圆形，本申请对此不做限制。
其中，如图5所示，第一凸台1121与第二凸台1122在顶盖111上对称设置，及第一凸台1121与第二凸台1122的形状和大小可完全相同。
具体地，第一连接片121为正极连接片，裸电芯的第一极耳为正极极耳，第一极柱1151为正极极柱；第二连接片122为负极连接片，裸电芯的第二极耳为负极极耳，第二极柱1152为负极极柱。或者，第一连接片121为负极连接片，裸电芯的第一极耳为负极极耳，第一极柱1151为负极极柱；第二连接片122为正极连接片，裸电芯的第二极耳为正极极耳，第二极柱1152为正极极柱。
其中，正极连接片可用铝制材料形成，负极连接片可由铜制材料形成。
其中，如图5所示，第一连接片121与第二连接片122在顶盖111上可对称设置，及第一连接片121与第二连接片122的形状和大小可完全对称。当然，第一连接片121的结构与第二连接片122的结构可不同，或仅第一连接片121上的第二凸起部1223与第二连接片122上的第二凸起部1223的结构完全相同。
其中，第一连接片121与第二连接片122上可分别设置定位孔或定位槽，下塑胶112上设置定位凸起，通过定位凸起与定位孔或定位槽配合，第一连接片121与第二连接片122在下塑胶112上的快速定位，同时避免第一连接片121与第二连接片122在下塑胶112上位置出现偏差。
其中，绝缘贴片150例如为绝缘胶带；当然，绝缘贴片150还可为其他具有粘接和绝缘功能的功能膜，本申请对此不做限制。
具体地，如图4所述，顶盖111上还设有防爆阀1160，通过防爆阀1160能够及时将壳体140内产生的高温高压气体排出。
本申请提供的储能装置例如可为单体电池，或为包括多个单体电池的电池模组。
本申请的实施例还提供了一种用电设备，该用电设备包括上述的储能装置，用电设备例如可为图10所示的车辆20。本申请提供的用电设备，储能装置中的连接片与下塑胶之间具有间隙，凸台靠近连接片的一侧设有缺口，绝缘贴片覆盖连 接片与通孔，使得绝缘贴片、连接片与槽沿围合形成了电解液的第一流道；在通过注液孔向壳体内加注电解液时，由于绝缘贴片覆盖连接片与通孔，使得电解液沿着绝缘贴片和连接片与下塑胶之间的间隙进行流动，接着电解液可通过凸台的缺口流出，进而流向电极组件，实现对电解液的导流，使得电解液能够充分的流向电极组件的各个部分；通过第一弧线段、第二弧线段、第三弧线段与第四弧线段构成缺口的槽沿，使得凸台缺口转角为圆角，电解液在流经缺口时，电解液在缺口的转角处的流速较快，使得电解液能更快、更顺畅地流入电极组件；同时，将缺口的转角设置为圆角，能够避免缺口的转角划伤极耳，提高了储能装置的可靠性，进而提高了用电设备的可靠性。
在申请实施例中，术语“多个”则指两个或两个以上，除非另有明确的限定。术语“连接”等术语均应做广义理解，例如，“连接”可以是固定连接，也可以是可拆卸连接，或一体地连接。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在申请实施例中的具体含义。
申请实施例的描述中，需要理解的是，术语“上”、“下”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述申请实施例和简化描述，而不是指示或暗示所指的装置或单元必须具有特定的方向、以特定的方位构造和操作，因此，不能理解为对申请实施例的限制。
在本说明书的描述中，术语“一个实施例”的描述意指结合该实施例或示例描述的具体特征、结构、材料或特点包含于申请实施例的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或实例。而且，描述的具体特征、结构、材料或特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
以上仅为申请实施例的优选实施例而已，并不用于限制申请实施例，对于本领域的技术人员来说，申请实施例可以有各种更改和变化。凡在申请实施例的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在申请实施例的保护范围之内。

Claims (21)

  1. 一种储能装置，包括：
    壳体，所述壳体具有开口，容纳电解液；
    电极组件，所述电极组件容纳于所述壳体；
    顶盖，所述顶盖盖合于所述开口，所述顶盖具有注液孔；
    下塑胶，所述下塑胶具有通孔，所述下塑胶设置在所述顶盖靠近所述电极组件的一侧，所述下塑胶包括沿所述下塑胶长度方向上间隔设置的多个凸台，多个凸台至少包括第一凸台和第二凸台，所述第一凸台和所述第二凸台分别位于所述下塑胶长度方向的两端，所述多个凸台位于所述下塑胶朝向所述电极组件的一侧，所述通孔与所述注液孔连通；
    连接片，所述连接片设置在所述下塑胶朝向所述电极组件的一侧，在所述连接片的厚度方向上，至少部分所述连接片与所述下塑胶之间具有间隙；
    绝缘贴片，所述绝缘贴片贴设在所述连接片朝向所述电极组件的一侧，且覆盖所述连接片与所述通孔；
    其中，所述第一凸台和所述第二凸台靠近所述连接片的一侧分别设有缺口，所述绝缘贴片、所述连接片与所述缺口围合形成所述电解液的第一流道，所述电解液进入所述注液孔通过所述第一流道能够流向所述电极组件。
  2. 根据权利要求1所述的储能装置，其中，所述缺口包括沿着所述下塑胶宽度方向上依次布置的第一弧线段、第二弧线段、第三弧线段、第四弧线段，所述第一弧线段与所述第二弧线段连接，所述第三弧线段与所述第四弧线段连接，所述第二弧线段与所述第三弧线段连接，所述第一弧线段相对于所述第二弧线段更靠近于所述通孔，第四弧线段相对于所述第三弧线段更靠近于所述通孔，所述第一弧线段、所述第二弧线段、所述第三弧线段与所述第四弧线段构成所述缺口的槽沿。
  3. 根据权利要求1或2所述的储能装置，其中，所述下塑胶在宽度方向的两侧形成有朝向所述电极组件一侧延伸的加强筋，所述连接片与所述加强筋在所述下塑胶的宽度方向上具有间隙，至少部分位于所述连接片上的所述绝缘贴片与所述加强筋在所述下塑胶的宽度方向上具有间隙；所述绝缘贴片、所述连接片与所述加强筋围合形成所述电解液的第二流道，所述电解液进入所述注液孔通过所述第二流道能够流向所述电极组件。
  4. 根据权利要求1～3任一项所述的储能装置，其中，所述连接片包括极柱连接部、过渡部与两个极耳连接部，所述极柱连接部通过所述过渡部与所述两个极耳连接部连接；所述两个极耳连接部位于所述过渡部背离所述缺口的一侧，且所述两个极耳连接部在所述连接片的宽度方向上间隔分布，所述通孔位于所述两个极耳连接部之间，所述绝缘贴片完全覆盖所述两个极耳连接部之间区域。
  5. 根据权利要求4所述的储能装置，其中，所述连接片还包括凸起部，所述凸起部位于所述过渡部朝向所述缺口的一侧，且至少部分所述凸起部位于所述缺口中。
  6. 根据权利要求5所述的储能装置，其中，在所述下塑胶的长度方向上，所述过渡部与所述凸台之间具有间隙，所述绝缘贴片覆盖所述间隙。
  7. 根据权利要求6所述的储能装置，其中，在所述下塑胶的长度方向上，所述 绝缘贴片覆盖所述凸起部与至少部分所述缺口。
  8. 根据权利要求7所述的储能装置，其中，至少部分所述绝缘贴片覆盖在所述凸台朝向所述电极组件的一侧上。
  9. 根据权利要求1～8任一项所述的储能装置，其中，所述电极组件包括裸电芯和连接于所述裸电芯上的极耳，所述极耳与所述连接片连接，所述绝缘贴片还完全覆盖所述极耳以及至少部分所述裸电芯。
  10. 根据权利要求1～9任一项所述的储能装置，其中，所述绝缘贴片包括多个子绝缘贴片，相邻的所述子绝缘贴片之间具有重叠区域。
  11. 根据权利要求2所述的储能装置，其中，所述缺口还包括：第一直线段、第二直线段和第三直线段中的至少一个，所述第一直线段连接于所述第一弧线段和所述第二弧线段之间，所述第二直线段连接于所述第三弧线段和所述第四弧线段之间，所述第三直线段连接于所述第二弧线段和所述第三弧线段之间。
  12. 根据权利要求2或11所述的储能装置，其中，所述第一弧线段的弧度为π/3～π/2，和/或所述第四弧线段的弧度为π/3～π/2。
  13. 根据权利要求2、11、12任一项所述的储能装置，其中，所述第一弧线段的圆弧半径为1mm～3mm，和/或所述第四弧线段的圆弧半径为1mm～3mm。
  14. 根据权利要求2、11～13任一项所述的储能装置，其中，所述第二弧线段的弧度为π/3～π/2，和/或所述第三弧线段的弧度为π/3～π/2。
  15. 根据权利要求2、11～14任一项所述的储能装置，其中，所述第二弧线段的圆弧半径为1mm～3mm，和/或所述第三弧线段的圆弧半径为1mm～3mm。
  16. 根据权利要求1～15任一项所述的储能装置，其中，在所述下塑胶的宽度方向上，所述缺口的宽度为所述凸台的宽度的40％～60％。
  17. 根据权利要求1～16任一项所述的储能装置，其中，在所述下塑胶的宽度方向上，所述缺口的宽度为25mm～30mm。
  18. 根据权利要求1～17任一项所述的储能装置，其中，在所述下塑胶的长度方向上，所述缺口的深度为所述凸台的长度的20％～30％。
  19. 根据权利要求1～18任一项所述的储能装置，其中，在所述下塑胶的长度方向上，所述缺口的深度为3mm～6mm。
  20. 根据权利要求5～8任一项所述的储能装置，其中，所述缺口还包括：第一直线段、第二直线段和第三直线段，所述第一直线段连接于所述第一弧线段和所述第二弧线段之间，所述第二直线段连接于所述第三弧线段和所述第四弧线段之间，所述第三直线段连接于所述第二弧线段和所述第三弧线段之间；
    所述凸起部包括朝向所述缺口的顶面以及在所述连接片的宽度方向上位于所述顶面两侧的第一侧面和第二侧面，所述顶面与所述第三直线段相向设置且具有第一预设间隙，所述第一侧面与所述第一直线段相向设置且具有第二预设间隙，所述第二侧面与所述第二直线段相向设置且具有第三预设间隙；所述第一预设间隙为2mm～5mm，所述第二预设间隙为3mm～10mm，所述第三预设间隙为3mm～10mm。
  21. 一种用电设备，包括权利要求1～20任一项所述的储能装置。
PCT/CN2022/131543 2022-11-11 2022-11-11 储能装置及用电设备 WO2024098421A1 (zh)

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