Single battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a single battery and a battery pack. In the single battery, a mounting groove is formed in a part, close to a first side, of a top cover sheet of a top cover assembly. The first insulating part is arranged on the first side, and the first insulating part is arranged between the top cover plate and the pole, so that the top cover plate and the pole are insulated from each other. A first sealing piece is arranged in the mounting groove, and the first insulating piece and the top cover piece are configured to cooperatively extrude the first sealing piece in the first direction to form sealing. The first sealing piece can effectively prevent electrolyte from flowing into the pole from the space between the first insulating piece and the top cover piece, so that the risk of short circuit of the single battery can be reduced.

Description

TECHNICAL FIELD

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

[0002] At present, in the process of single battery manufacturing and the process of single battery use, there is a problem that the single battery short-circuits due to the top cover sealing problem of the single battery, which may affect the performance of the single battery. Specifically, during the liquid injection and formation of the single battery, the problem of electrolyte spouting from the liquid injection hole may occur, and the electrolyte flows along the top cover and flows into the pole from the surface between the upper plastic and the aluminum plate, which easily leads to short circuit and other problems. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a single battery, which can reduce the risk of short circuit of the single battery.

[0004] The present application provides a single battery. The single battery comprises a shell; the single battery further comprises a top cover assembly, which is arranged on the shell; the single battery further comprises a battery cell, which is arranged in a cavity surrounded by the shell and the top cover assembly. The top cover assembly has a first direction, and the top cover assembly comprises a top cover sheet, the top cover sheet is provided with a mounting hole penetrating in the first direction, the two sides of the top cover sheet in the first direction are a first side and a second side respectively, and a mounting groove is arranged on the part of the top cover sheet close to the first side. The top cover assembly further comprises a pole, the pole is arranged in the mounting hole, and the part of the pole on the second side is used for electrically connecting with the battery cell. The top cover assembly further comprises a first insulating piece, the first insulating piece is arranged on the first side, and the first insulating piece is arranged between the top cover sheet and the pole, so that the top cover sheet and the pole are insulated from each other. The top cover assembly further comprises a first sealing piece, the first sealing piece is arranged in the mounting groove, and the first sealing piece abuts against the first insulating piece and the top cover sheet in the first direction.

[0005] In an embodiment of the present application, the top cover assembly further has a second direction perpendicular to the first direction; the mounting groove comprises a first groove part and a second groove part in communication, and the second groove part is located on one side of the first groove part in the second direction; the first sealing piece is arranged in the first groove part, and the first sealing piece fills the second groove part.

[0006] In an embodiment of the present application, the size of the first groove part in the second direction is L1 mm, and the width of the first sealing piece in the natural state is L2 mm, which satisfies: L2+0.06≤L1≤L2+0.1.

[0007] In an embodiment of the present application, the second groove part comprises a first sub-groove part and a second sub-groove part, the first sub-groove part and the second sub-groove part are located on the two sides of the first groove part in the second direction respectively, and the first sealing piece fills the first sub-groove part and the second sub-groove part respectively.

[0008] In an embodiment of the application, the first sub-groove portion has a dimension in the second direction of L3 mm, and the second sub-groove portion has a dimension in the second direction of L4 mm, satisfying: 0.7L4≤L3≤1.3L4.

[0009] In an embodiment of the application, the first groove portion has a dimension in the first direction of H1 mm, and the second groove portion has a dimension in the first direction of H3 mm, satisfying: H1≥H3.

[0010] In an embodiment of the application, the top cover assembly further comprises: a second insulating member arranged on the second side and arranged between the top cover sheet and the pole, so that the top cover sheet and the pole are insulated from each other; and a second sealing member arranged around the outer periphery of the pole and clamped between the top cover sheet and the pole to form a seal; wherein one of the second insulating member and the second sealing member is provided with a sealing protrusion, and the other is provided with a sealing groove, and the sealing protrusion is embedded in the sealing groove to form a seal.

[0011] In an embodiment of the application, the sealing protrusion comprises a first sealing protrusion and a second sealing protrusion, and the sealing groove comprises a first sealing groove and a second sealing groove, the first sealing protrusion and the first sealing groove are arranged on the second insulating member, the second sealing protrusion and the second sealing groove are arranged on the second sealing member, the first sealing protrusion is embedded in the second sealing groove, and the second sealing protrusion is embedded in the first sealing groove.

[0012] In an embodiment of the application, the top cover assembly further has a second direction perpendicular to the first direction; the first sealing protrusion has a dimension in the second direction of L5 mm, the first sealing groove has a dimension in the second direction of L6 mm, and the second sealing groove has a dimension in the second direction of L7 mm, and at least one of the following conditions is satisfied:

[0013] 0.5≤L5≤1;

[0014] 0.5≤L6≤1;

[0015] L5 -0.1≤L7≤L5 -0.06.

[0016] In an embodiment of the application, the second sealing member comprises a sealing main portion and an extended sealing portion, the sealing main portion is arranged around the outer periphery of the pole, the extended sealing portion is connected to the outer periphery of the end portion of the sealing main portion close to the second side, at least part of the extended sealing portion is clamped between the second insulating member and the pole in the first direction, and the second sealing protrusion and the second sealing groove are arranged on the extended sealing portion.

[0017] The application also provides a battery pack comprising the single battery as described above.

[0018] The beneficial effects of the present application are: different from the prior art, the present application provides a single battery. In the single battery, the top cover sheet of the top cover assembly is provided with a mounting groove near the first side. The first insulating piece is arranged at the first side, and the first insulating piece is arranged between the top cover sheet and the pole, so that the top cover sheet and the pole are insulated from each other. The first sealing piece is arranged in the mounting groove, and the first insulating piece and the top cover sheet are configured to press the first sealing piece in the first direction to form a seal. The first sealing piece of the present application can effectively prevent the electrolyte from flowing into the pole between the first insulating piece and the top cover sheet, thereby reducing the risk of short circuit of the single battery. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is a structural schematic diagram of a top cover assembly according to an embodiment of the present application;

[0021] Figure 2 is Figure 1 is an exploded structural schematic diagram of the top cover assembly shown in

[0022] Figure 3 is Figure 1 is a cross-sectional structural schematic diagram of the top cover assembly A-A direction shown in

[0023] Figure 4 is Figure 3 is a structural schematic diagram of the B region of the top cover assembly shown in

[0024] Figure 5 is a structural schematic diagram of a top cover sheet according to an embodiment of the present application;

[0025] Figure 6 is Figure 5 is a structural schematic diagram of the C region of the top cover sheet shown in

[0026] Figure 7 is a structural schematic diagram of a first sealing piece according to an embodiment of the present application;

[0027] Figure 8 is a structural schematic diagram of a second insulating piece according to an embodiment of the present application;

[0028] Figure 9 is Figure 8 is a structural schematic diagram of the D region of the second insulating piece shown in

[0029] Figure 10is a structural schematic view of an embodiment of the second sealing member of the application;

[0030] Figure 11 is Figure 10 is a structural schematic view of the second sealing member E area.

[0031] Explanation of reference signs:

[0032] 10 top cover assembly; 11 top cover sheet; 11a first side; 11b second side; 111 mounting hole; 112 mounting groove; 1121 first groove portion; 1122 second groove portion; 1123 first sub-groove portion; 1124 second sub-groove portion; 12 pole column; 13 first insulating member; 14 first sealing member; 15 second insulating member; 16 second sealing member; 161 sealing main body portion; 162 outer extension sealing portion; 17 sealing protrusion; 171 first sealing protrusion; 172 second sealing protrusion; 18 sealing groove; 181 first sealing groove; 182 second sealing groove. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the application, and are not used to limit the application. In the application, unless otherwise specified and limited, the terms such as "connected", "connected", "stacked" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrated; can be directly connected, or indirectly connected through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0034] In the application, unless otherwise specified and limited, the terms "connected", "connected", "stacked" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrated; can be directly connected, or indirectly connected through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0035] The application provides a single battery, which will be described in detail below. It should be noted that the description order of the following embodiments is not limited as the preferred order of the embodiments of the application. In the following embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0036] To solve the technical problem that the single battery is prone to short circuit caused by electrolyte in the prior art, an embodiment of the present application provides a single battery. The single battery comprises a shell; the single battery further comprises a top cover assembly, the top cover assembly is arranged on the shell; the single battery further comprises a battery cell, the battery cell is arranged in a cavity surrounded by the shell and the top cover assembly. Wherein, the top cover assembly has a first direction, the top cover assembly comprises a top cover sheet, the top cover sheet is provided with a mounting hole penetrating in the first direction, two sides of the top cover sheet in the first direction are a first side and a second side respectively, and a mounting groove is arranged on the part of the top cover sheet close to the first side. The top cover assembly further comprises a pole, the pole is arranged in the mounting hole, and the part of the pole at the second side is used for electrically connecting with the battery cell. The top cover assembly further comprises a first insulating piece, the first insulating piece is arranged on the first side, and the first insulating piece is arranged between the top cover sheet and the pole, so that the top cover sheet and the pole are insulated from each other. The top cover assembly further comprises a first sealing piece, the first sealing piece is arranged in the mounting groove, and the first insulating piece and the top cover sheet are configured to press the first sealing piece in the first direction to form a seal. Details are described below.

[0037] In an embodiment, the battery pack comprises a box body and a plurality of single batteries, the plurality of single batteries are accommodated in the box body. The single battery includes but is not limited to a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery or a magnesium ion battery, etc., and the present application does not limit this. The battery pack is a power supply for a power consuming device. The power consuming device can be a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric vehicle, a ship, a spacecraft, an electric toy and an electric tool, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric plane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, such as a power drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. The single battery comprises a shell and a top cover assembly, the top cover assembly is arranged on the shell, and the top cover assembly and the shell cooperate to form a cavity for accommodating a battery cell.

[0038] The top cover assembly of the embodiment of the present application is described below.

[0039] Please refer to Figures 1 to 6 , Figure 1 is a structural schematic diagram of the top cover assembly of the embodiment of the present application, Figure 2 is Figure 1 is an exploded structural schematic diagram of the top cover assembly shown in Figure 3 is Figure 1 is a sectional structural schematic diagram of the top cover assembly in A-A direction shown in Figure 4 is Figure 3 is a structural schematic diagram of the B area of the top cover assembly shown inFigure 5 is a structural schematic diagram of an embodiment of a top cover sheet, Figure 6 is Figure 5 is a structural schematic diagram of a region of the top cover sheet C shown.

[0040] In an embodiment, the top cover assembly 10 has a first direction Z. The top cover assembly 10 includes a top cover sheet 11 provided with a mounting hole 111 extending through in the first direction Z. The top cover sheet 11 has a first side 11a and a second side 11b on two sides of the top cover sheet 11 in the first direction Z, and a mounting groove 112 is formed in a portion of the top cover sheet 11 close to the first side 11a. The top cover assembly 10 further includes a pole 12 arranged in the mounting hole 111, and a portion of the pole 12 at the second side 11b is configured to electrically connect with a battery cell. The top cover assembly 10 further includes a first insulating member 13 arranged at the first side 11a and between the top cover sheet 11 and the pole 12, so that the top cover sheet 11 and the pole 12 are insulated from each other.

[0041] The top cover assembly 10 further includes a first sealing member 14 arranged in the mounting groove 112 and abutting against the first insulating member 13 and the top cover sheet 11 in the first direction Z. The first insulating member 13 and the top cover sheet 11 are configured to press the first sealing member 14 to form a seal in the first direction Z. In this way, the first sealing member 14 can effectively prevent the electrolyte from flowing from between the first insulating member 13 and the top cover sheet 11 into the pole 12, thereby reducing the risk of short circuit of the single battery. In particular, when the single battery is being injected with electrolyte and formed, the electrolyte may

[0042] It should be noted that the first insulating member 13 can be made of plastic or the like. The first insulating member 13 can surround the outer periphery of the pole 12, so that the top cover sheet 11 and the pole 12 are insulated from each other and a seal is formed between the top cover sheet 11 and the pole 12. The first sealing member 14 surrounds the outer periphery of the pole 12 to minimize the risk of the electrolyte flowing from between the first insulating member 13 and the top cover sheet 11 into the pole 12, thereby reducing the risk of short circuit of the single battery. The mounting groove 112 surrounds the outer periphery of the mounting hole 111, the first sealing member 14 is annular, and the first sealing member 14 is embedded in the mounting groove 112.

[0043] In an embodiment, the top cover assembly 10 further has a second direction X perpendicular to the first direction Z. The mounting groove 112 includes a first groove portion 1121 and a second groove portion 1122 in communication, and the second groove portion 1122 is located on one side of the first groove portion 1121 in the second direction X. The first sealing member 14 is arranged in the first groove portion 1121, and the first sealing member 14 is configured to fill the second groove portion 1122 under the cooperation and extrusion of the first insulation member 13 and the top cover sheet 11.

[0044] In the above manner, the mounting groove 112 of the embodiment is provided with the second groove portion 1122 to avoid the deformed first sealing member 14 after extrusion, specifically, the first sealing member 14 fills the second groove portion 1122 under the cooperation and extrusion of the first insulation member 13 and the top cover sheet 11. The first sealing member 14 is provided with a reasonable extrusion amount to balance the sealing effect and structural stability of the first sealing member 14. The volume of the second groove portion 1122 matches the extrusion amount of the first sealing member 14, which further helps to ensure the sealing effect of the first sealing member 14. If the volume of the second groove portion 1122 is too small, the first sealing member 14 is easy to protrude from the mounting groove 112, causing the contact surface between the first insulation member 13 and the top cover sheet 11 to be uneven, which weakens the sealing effect between the first insulation member 13 and the top cover sheet 11. If the volume of the second groove portion 1122 is too large, the first sealing member 14 cannot fill the second groove portion 1122, resulting in poor sealing effect between the first insulation member 13 and the top cover sheet 11.

[0045] Please refer to Figure 7 , Figure 7 is a structural schematic diagram of an embodiment of the first sealing member of the present application.

[0046] In an embodiment, the first slot portion 1121 has a dimension in the second direction X of L1 mm, and the first seal 14 has a width in a natural state of L2 mm, satisfying: L2+0.06≤L1≤L2+0.1. The natural state of the first seal 14 is understood as a state in which the first seal 14 is not extruded. The width of the first seal 14 in the natural state is the dimension of the first seal 14 in the second direction X in the natural state. This embodiment further facilitates ensuring the sealing effect between the first insulating member 13 and the top cover sheet 11 by reasonably setting the dimension of the first slot portion 1121 in the second direction X. If the dimension of the first slot portion 1121 in the second direction X is too small, the assembly effect of the first seal 14 will be poor, and the first seal 14 is likely to protrude from the mounting slot 112, causing the first insulating member 13 to protrude, resulting in an increased gap between the first insulating member 13 and the top cover sheet 11, meaning an increased risk of external electrolyte flowing into the pole 12 from between the first insulating member 13 and the top cover sheet 11. If the dimension of the first slot portion 1121 in the second direction X is too large, the gap between the first seal 14 and the edges on both sides of the first slot portion 1121 is likely to be different, causing the sealing effect of the first seal 14 on one side to be poor, and thus increasing the risk of external electrolyte flowing into the pole 12 from between the first insulating member 13 and the top cover sheet 11.

[0047] Optionally, L2 also satisfies: 0.5≤L2≤2, for example, L2 can be any value in 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0. This embodiment reasonably sets the width of the first seal 14 in the natural state to balance the sealing effect, size, and cost of the first seal 14. If the width of the first seal 14 in the natural state is too small, the sealing path of the first seal 14 is insufficient, affecting the sealing effect of the first seal 14. If the width of the first seal 14 in the natural state is too large, the size of the first seal 14 is too large, and the cost is too high.

[0048] In an embodiment, the second groove portion 1122 comprises a first sub-groove portion 1123 and a second sub-groove portion 1124, the first sub-groove portion 1123 and the second sub-groove portion 1124 are respectively located on both sides of the first groove portion 1121 in the second direction X, and the first sealing member 14 is configured to fill the first sub-groove portion 1123 and the second sub-groove portion 1124 respectively under the cooperation and extrusion of the first insulating member 13 and the top cover sheet 11. The first sub-groove portion 1123 is located on the outer side of the first groove portion 1121 in the second direction X, and the second sub-groove portion 1124 is located on the inner side of the first groove portion 1121 in the second direction X. In this embodiment, under the cooperation and extrusion of the first insulating member 13 and the top cover sheet 11, the first sealing member 14 fills the first sub-groove portion 1123 and the second sub-groove portion 1124 respectively, so that the first sealing member 14 has a relatively consistent sealing effect on both sides in the second direction X, which further helps to ensure the sealing effect between the first insulating member 13 and the top cover sheet 11, and reduces the risk of electrolyte flowing from between the first insulating member 13 and the top cover sheet 11 into the pole piece 12.

[0049] Specifically, the size of the first sub-groove portion 1123 in the second direction X is L3 mm, the size of the second sub-groove portion 1124 in the second direction X is L4 mm, and 0.7L4≤L3≤1.3L4 is satisfied. In this way, the sizes of the first sub-groove portion 1123 and the second sub-groove portion 1124 in the second direction X are relatively consistent, so that the first sealing member 14 has a relatively consistent sealing effect on both sides in the second direction X, which further helps to ensure the sealing effect between the first insulating member 13 and the top cover sheet 11, and reduces the risk of electrolyte flowing from between the first insulating member 13 and the top cover sheet 11 into the pole piece 12.

[0050] In an embodiment, the size of the first groove portion 1121 in the first direction Z is H1 mm, and 0.5≤H1≤1 is satisfied, for example, H1 can be any value in 0.5, 0.6, 0.7, 0.8, 0.9, 1.0. The height of the first sealing member 14 in a natural state is H2 mm, and 0.6≤H2≤1.3 is satisfied, for example, H2 can be any value in 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3. In this embodiment, the size of the first groove portion 1121 in the first direction Z is reasonably set, so that the size of the first groove portion 1121 in the first direction Z matches the extrusion amount of the first sealing member 14, and the first sealing member 14 has a reasonable extrusion amount. If the extrusion amount of the first sealing member 14 is too small, the first sealing member 14 cannot provide sufficient sealing effect; if the extrusion amount of the first sealing member 14 is too large, it is not conducive to ensuring the structural stability of the first sealing member 14.

[0051] In an embodiment, the second groove portion 1122 has a dimension H3 in the first direction Z, and H1≥H3 is satisfied. In this way, by reasonably setting the dimension of the second groove portion 1122 in the first direction Z, the first sealing member 14 has a reasonable extrusion amount, which is further conducive to ensuring the sealing effect between the first insulating member 13 and the top cover sheet 11, and reducing the risk of electrolyte flowing from between the first insulating member 13 and the top cover sheet 11 into the pole piece 12. If the dimension of the second groove portion 1122 in the first direction Z is greater than the dimension of the first groove portion 1121 in the first direction Z, the extrusion amount of the first sealing member 14 will be too small, the sealing effect of the first sealing member 14 will be poor, and the risk of external electrolyte flowing from between the first insulating member 13 and the top cover sheet 11 into the pole piece 12 will increase.

[0052] Please refer to Figures 8 to 11 , Figure 8 is a structural schematic view of an embodiment of a second insulating member of the application, Figure 9 is a structural schematic view of a D region of the second insulating member shown in Figure 8 , Figure 10 is a structural schematic view of an embodiment of a second sealing member of the application, Figure 11 is a structural schematic view of an E region of the second sealing member shown in Figure 10 ,

[0053] In an embodiment, the top cover assembly 10 further comprises a second insulating member 15. The second insulating member 15 is arranged on the second side 11b of the top cover sheet 11, and the second insulating member 15 is arranged between the top cover sheet 11 and the pole piece 12, so that the top cover sheet 11 and the pole piece 12 are insulated from each other. Optionally, the material of the second insulating member 15 can be plastic or the like. The top cover assembly 10 further comprises a second sealing member 16. The second sealing member 16 surrounds the outer periphery of the pole piece 12, and the second sealing member 16 is clamped between the top cover sheet 11 and the pole piece 12 to form a seal.

[0054] One of the second insulating member 15 and the second sealing member 16 is provided with a sealing protrusion 17, and the other is provided with a sealing groove 18, and the sealing protrusion 17 is embedded in the sealing groove 18 to form a seal. In this embodiment, the second insulating member 15 and the second sealing member 16 form a seal through the concave-convex cooperation of the sealing protrusion 17 and the sealing groove 18. The cooperation of the sealing protrusion 17 and the sealing groove 18 forms a winding sealing path between the second insulating member 15 and the second sealing member 16, which prolongs the path length of the electrolyte flowing from between the second insulating member 15 and the second sealing member 16 into the pole piece 12, effectively hinders the electrolyte from flowing into the pole piece 12 to conduct the pole piece 12 and the top cover sheet 11, and further reduces the risk of corrosion and other problems caused by internal short circuit of the single battery.

[0055] Specifically, the sealing protrusion 17 includes a first sealing protrusion 171 and a second sealing protrusion 172, and the sealing groove 18 includes a first sealing groove 181 and a second sealing groove 182. The first sealing protrusion 171 and the first sealing groove 181 are arranged on the second insulating piece 15, the second sealing protrusion 172 and the second sealing groove 182 are arranged on the second sealing piece 16, the first sealing protrusion 171 is embedded in the second sealing groove 182, and the second sealing protrusion 172 is embedded in the first sealing groove 181.

[0056] In an embodiment, the size of the first sealing protrusion 171 in the second direction X is L5 mm, satisfying: 0.5≤L5≤1, for example, L5 can be any value in 0.5, 0.6, 0.7, 0.8, 0.9, 1.0. In this way, the embodiment reasonably sets the size of the first sealing protrusion 171 in the second direction X, so that the first sealing protrusion 171 and the second sealing groove 182 can cooperate to prolong the path length of the electrolyte flowing from between the second insulating piece 15 and the second sealing piece 16 into the pole piece 12, improve the sealing effect between the second insulating piece 15 and the second sealing piece 16, and effectively prevent the electrolyte from flowing into the pole piece 12 to conduct the pole piece 12 and the top cover sheet 11.

[0057] In an embodiment, the size of the first sealing groove 181 in the second direction X is L6 mm, satisfying: 0.5≤L6≤1, for example, L6 can be any value in 0.5, 0.6, 0.7, 0.8, 0.9, 1.0. In this way, the embodiment reasonably sets the size of the first sealing groove 181 in the second direction X to ensure the assembly feasibility between the first sealing groove 181 and the second sealing protrusion 172, that is, the second sealing protrusion 172 can be embedded in the first sealing groove 181, and the first sealing groove 181 and the second sealing protrusion 172 can cooperate to prolong the path length of the electrolyte flowing from between the second insulating piece 15 and the second sealing piece 16 into the pole piece 12, improve the sealing effect between the second insulating piece 15 and the second sealing piece 16, and effectively prevent the electrolyte from flowing into the pole piece 12 to conduct the pole piece 12 and the top cover sheet 11.

[0058] In an embodiment, the second sealing groove 182 has a size L7 mm in the second direction X, satisfying: L5 - 0.1≤L7≤L5 - 0.06. This embodiment sets the size of the second sealing groove 182 in the second direction X reasonably, so that the first sealing protrusion 171 can be embedded in the second sealing groove 182, and the first sealing protrusion 171 and the second sealing groove 182 can cooperate to prolong the path length of the electrolyte flowing from between the second insulating part 15 and the second sealing part 16 into the pole post 12, improve the sealing effect between the second insulating part 15 and the second sealing part 16, and effectively hinder the electrolyte from flowing into the pole post 12 to conduct the pole post 12 and the top cover sheet 11.

[0059] In an embodiment, the second insulating part 15 at the position of the first sealing protrusion 171 has a size H4 mm in the first direction Z, satisfying: 0.3≤H4≤0.6, for example, H4 can be any value in 0.3, 0.4, 0.5, 0.6. In this way, this embodiment sets the height of the second insulating part 15 at the position of the first sealing protrusion 171 reasonably, so that the first sealing protrusion 171 has a reasonable extrusion amount, ensures the sealing effect between the second insulating part 15 and the second sealing part 16, and reduces the risk of the electrolyte flowing into the pole post 12 to conduct the pole post 12 and the top cover sheet 11.

[0060] In an embodiment, the second insulating part 15 at the position of the first sealing groove 181 has a size H5 mm in the first direction Z, satisfying: 0.2≤H5≤0.4, for example, H5 can be any value in 0.2, 0.3, 0.4. In this way, this embodiment sets the height of the second insulating part 15 at the position of the first sealing groove 181 reasonably, so that the second sealing protrusion 172 has a reasonable extrusion amount, ensures the sealing effect between the second insulating part 15 and the second sealing part 16, and reduces the risk of the electrolyte flowing into the pole post 12 to conduct the pole post 12 and the top cover sheet 11.

[0061] In an embodiment, the second sealing groove 182 has a size H6 mm in the first direction Z, satisfying: 0.2≤H6≤0.4, for example, H6 can be any value in 0.2, 0.3, 0.4. In this way, this embodiment sets the depth of the second sealing groove 182 reasonably, which is conducive to ensuring the assembly feasibility between the first sealing protrusion 171 and the second sealing groove 182, and conducive to making the first sealing protrusion 171 have a reasonable extrusion amount, ensuring the sealing effect between the second insulating part 15 and the second sealing part 16, and reducing the risk of the electrolyte flowing into the pole post 12 to conduct the pole post 12 and the top cover sheet 11.

[0062] In an embodiment, the second sealing member 16 comprises a sealing body portion 161 and an extended sealing portion 162. The sealing body portion 161 is arranged around the outer periphery of the pole column 12, and the extended sealing portion 162 is connected to the outer periphery of the end portion of the sealing body portion 161 close to the second side 11b, i.e., the extended sealing portion 162 is a stepped structure protruding from the outer periphery of the sealing body portion 161. At least part of the extended sealing portion 162 is clamped between the second insulating member 15 and the pole column 12 in the first direction Z, and the second sealing protrusion 172 and the second sealing groove 182 are arranged on the extended sealing portion 162.

[0063] In an embodiment, the extended sealing portion 162 has a dimension H7 mm in the first direction Z, and satisfies: 0.6≤H7≤0.9, for example, H7 can be any value in 0.6, 0.7, 0.8, 0.9. In this way, the embodiment rationally sets the height of the extended sealing portion 162, which is conducive to improving the utilization rate of the internal space of the single battery and ensuring the structural strength of the extended sealing portion 162. If the height of the extended sealing portion 162 is too large, it will lead to a decrease in the utilization rate of the internal space of the single battery, and also easily lead to excessive extrusion of the extended sealing portion 162, which affects the structural stability of the extended sealing portion 162, and even leads to sealing failure of the extended sealing portion 162; if the height of the extended sealing portion 162 is too small, it will lead to too low structural strength of the extended sealing portion 162, which is easily torn when extruded, leading to structural damage, and thus leading to sealing failure of the extended sealing portion 162.

[0064] In an embodiment, the extended sealing portion 162 has a dimension L8 mm in the second direction X, and satisfies: 1.4≤L8≤2.5, for example, L8 can be any value in 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5. In this way, the embodiment rationally sets the width of the extended sealing portion 162, so that the second insulating member 15 and the second sealing member 16 form a long enough sealing path through the concave-convex cooperation of the sealing protrusion 17 and the sealing groove 18, effectively preventing the electrolyte from flowing into the pole column 12 to conduct the pole column 12 and the top cover sheet 11, and thus reducing the risk of corrosion and other problems caused by internal short circuit of the single battery.

[0065] The performance of the technical solutions provided by the embodiments of the present application is evaluated in combination with specific embodiments.

[0066] Examples 1-17 are provided. Examples 1-4 and 7-17 satisfy L2+0.06≤L1≤L2+0.1, Examples 5 and 6 do not satisfy L2+0.06≤L1≤L2+0.1. Examples 1-6 and 9-17 satisfy 0.5≤L2≤2, Examples 7 and 8 do not satisfy 0.5≤L2≤2. Examples 1-8 and 10-17 satisfy 0.7L4≤L3≤1.3L4, Example 9 does not satisfy 0.7L4≤L3≤1.3L4. Examples 1-9 and 12-17 satisfy 0.5≤L5≤1, Examples 10 and 11 do not satisfy 0.5≤L5≤1. Examples 1-11 and 14-17 satisfy 0.5≤L6≤1, Examples 12 and 13 do not satisfy 0.5≤L6≤1. Examples 1-13 and 16-17 satisfy L5 -0.1≤L7≤L5 -0.06, Examples 14 and 15 do not satisfy L5 -0.1≤L7≤L5 -0.06. Examples 1-15 satisfy 1.4≤L8≤2.5, Examples 16 and 17 do not satisfy 1.4≤L8≤2.5. The specific parameters and test results are shown in Table 1.

[0067] Table 1

[0068]

[0069]

[0070] Examples 18-34 are provided. Examples 18-21 and 24-34 satisfy 0.5≤H1≤1, Examples 22 and 23 do not satisfy 0.5≤H1≤1. Examples 18-23 and 26-34 satisfy 0.6≤H2≤1.3, Examples 24 and 25 do not satisfy 0.6≤H2≤1.3. Examples 18-25 and 27-34 satisfy H1≥H3, Example 26 does not satisfy H1≥H3. Examples 18-26 and 29-34 satisfy 0.3≤H4≤0.6, Examples 27 and 28 do not satisfy 0.3≤H4≤0.6. Examples 18-28 and 31-34 satisfy 0.2≤H5≤0.4, Examples 29 and 30 do not satisfy 0.2≤H5≤0.4. Examples 18-30 and 33-34 satisfy 0.2≤H6≤0.4, Examples 31 and 32 do not satisfy 0.2≤H6≤0.4. Examples 18-32 satisfy 0.6≤H7≤0.9, Examples 33 and 34 do not satisfy 0.6≤H7≤0.9. The specific parameters and test results are shown in Table 2.

[0071] Table 2

[0072]

[0073]

[0074] It should be noted that the electrolyte penetration rate is defined as the proportion of the top cover assembly 10 penetrated by the electrolyte in a batch of top cover assemblies 10. The sealing test method between the first insulating part 13 and the top cover sheet 11 is as follows: taking 100 top cover assemblies 10 as an example, for each top cover assembly 10, the top cover assembly 10 is placed upright, 5ml of electrolyte is dropped along the edge of the first insulating part 13, and is left to stand for 2h, vacuum drying for 5h, disassembly for component analysis, analysis of the composition of the top cover sheet 11 in the inner ring area of the first sealing part 14, to determine whether there is P element in this area, if there is P element, it is determined that the top cover assembly 10 is penetrated by the electrolyte. The sealing test method between the second insulating part 15 and the second sealing part 16 is as follows: taking 100 top cover assemblies 10 as an example, for each top cover assembly 10, the top cover assembly 10 is inverted, 5ml of electrolyte is dropped along the edge of the bottom plate of the pole 12, and is left to stand for 2h, vacuum drying for 5h, disassembly for component analysis, element analysis of the inner non-compression area of the outer extension sealing part 162 of the second sealing part 16, to determine whether there is P element in this area, if there is P element, it is determined that the top cover assembly 10 is penetrated by the electrolyte.

[0075] As can be seen, the top cover assemblies 10 in the above embodiments 1 to 34 all have a low electrolyte penetration rate, indicating that the risk of short circuit and corrosion of the single battery of the application is low. Especially, the top cover assemblies 10 in embodiments 1 to 4 and embodiments 18 to 21 have a lower electrolyte penetration rate, which also indicates that the risk of short circuit and corrosion of the single battery of the application is lower.

[0076] The application also provides a battery pack, which comprises the single battery as described above.

[0077] The single battery provided by the application is described in detail above, and specific examples are applied in this paper to describe the principles and implementation modes of the application. The above description of the embodiments is only used to help understand the method of the application and its core idea; at the same time, for those skilled in the art, according to the idea of the application, the specific implementation mode and application range will be changed, and the above description should not be understood as a limitation of the application.

Claims

1. A single battery, characterized in that: include: case; A top cover assembly, the top cover assembly being disposed on the housing; as well as The battery cell is disposed in a cavity enclosed by the shell and the top cover assembly; The top cover assembly has a first direction, and the top cover assembly includes: A top cover plate is provided with a mounting hole extending through the first direction, the top cover plate has a first side and a second side on both sides in the first direction, and a mounting groove is provided on a portion of the top cover plate close to the first side; A pole, disposed in the mounting hole, wherein a portion of the pole located on the second side is used for being electrically connected to the battery cell; a first insulating member disposed on the first side, and the first insulating member is disposed between the top cover sheet and the pole, so that the top cover sheet and the pole are insulated from each other; and A first sealing member is disposed in the mounting groove, and the first sealing member abuts against the first insulating member and the top cover piece along the first direction.

2. The single cell according to claim 1, characterized in that: The top cover assembly also has a second direction perpendicular to the first direction; the mounting slot includes a first slot portion and a second slot portion that are connected, and the second slot portion is located on at least one side of the first slot portion in the second direction; The first sealing member is disposed in the first groove portion, and the first sealing member fills the second groove portion.

3. The single cell according to claim 2, characterized in that: The dimension of the first groove in the second direction is L1 mm, and the width of the first sealing member in a natural state is L2 mm, satisfying the following: L2+0.06≤L1≤L2+0.

1.

4. The single cell according to claim 2, characterized in that: The second groove portion includes a first sub-groove portion and a second sub-groove portion, the first sub-groove portion and the second sub-groove portion are respectively located on both sides of the first groove portion in the second direction, and the first sealing member fills the first sub-groove portion and the second sub-groove portion respectively.

5. The single cell according to claim 4, characterized in that: The dimension of the first sub-groove in the second direction is L3 mm, and the dimension of the second sub-groove in the second direction is L4 mm, satisfying the following: 0.7L4≤L3≤1.3L4.

6. The single cell according to claim 2, characterized in that: The dimension of the first groove portion in the first direction is H1 mm, and the dimension of the second groove portion in the first direction is H3 mm, satisfying: H1 ≥ H3.

7. The single cell according to claim 1, characterized in that: The top cover assembly further comprises: a second insulating member disposed on the second side, and disposed between the top cover sheet and the pole, so that the top cover sheet and the pole are insulated from each other; A second sealing member is disposed around the outer periphery of the pole, and the second sealing member is sandwiched between the top cover sheet and the pole to form a seal; Wherein, one of the second insulating member and the second sealing member is provided with a sealing protrusion, and the other is provided with a sealing groove, and the sealing protrusion is embedded in the sealing groove to form a seal.

8. The single cell according to claim 7, characterized in that: The sealing protrusion includes a first sealing protrusion and a second sealing protrusion, and the sealing groove includes a first sealing groove and a second sealing groove. The first sealing protrusion and the first sealing groove are arranged on the second insulating member, and the second sealing protrusion and the second sealing groove are arranged on the second sealing member. The first sealing protrusion is embedded in the second sealing groove, and the second sealing protrusion is embedded in the first sealing groove.

9. The single cell according to claim 8, characterized in that: The top cover assembly also has a second direction perpendicular to the first direction; The size of the first sealing protrusion in the second direction is L5 mm, the size of the first sealing groove in the second direction is L6 mm, and the size of the second sealing groove in the second direction is L7 mm, and at least one of the following conditions is met: 0.5≤L5≤1； 0.5≤L6≤1； L5-0.1≤L7≤L5-0.

06.

10. The single cell according to claim 8, characterized in that: The second sealing member includes a sealing body and an extended sealing member. The sealing body is arranged around the outer periphery of the pole. The extended sealing member is connected to the outer periphery of the end of the sealing body close to the second side. At least a portion of the extended sealing member is clamped between the second insulating member and the pole in the first direction. The second sealing protrusion and the second sealing groove are arranged on the extended sealing member.

11. A battery pack, characterized in that: The invention comprises a single cell according to any one of claims 1 to 10.

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