Battery monomer and electric equipment

Abstract

The utility model relates to a single battery and electric equipment, the single battery comprises a shell, a battery cell, a first insulating part, a pole, a first sealing ring and a first water absorption expansion ring, and the end wall is provided with a first through hole; the first insulating part is arranged between the end wall and the battery cell, the first insulating part is provided with a second through hole, the pole is provided with a pole section and a first connecting section, and the pole section of the pole penetrates through the second through hole and the first through hole; the first connecting section of the pole is in contact with the inner circumferential side of the second through hole, the pole section of the pole is sleeved with the first sealing ring and the first water absorption expansion ring, the first water absorption expansion ring is clamped between the first connecting section and the first sealing ring, and at least part of the first sealing ring is clamped between the first water absorption expansion ring and the end wall. According to the single battery, on one hand, water vapor outside the battery can be prevented from entering the battery, and on the other hand, corrosion of liquid in the battery to the sealing ring is greatly reduced, so that the service life of the sealing ring is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially is related to a battery cell and electric equipment of battery. BACKGROUND

[0002] With the rapid development of lithium battery technology, people pay more and more attention to the service life and safety of battery products. In the long-term use process of lithium battery, the sealing ring in the top cover structure will age, which leads to the entry of external moisture into the battery and the leakage of internal liquid, and may trigger the safety failure of the battery under extreme conditions. At present, the conventional sealing method is to use single fluorine rubber for compression sealing. In the long-term use process, the sealing property of fluorine rubber is weakened, which leads to sealing failure, battery performance degradation and reduced battery safety. SUMMARY

[0003] Therefore, the utility model provides a battery cell and electric equipment for reducing the water permeability of the sealing ring.

[0004] To solve the above technical problems, the utility model provides a battery cell, which comprises:

[0005] A shell comprising an end wall, wherein the end wall is provided with a first through hole;

[0006] An electric core arranged in the shell;

[0007] A first insulating part arranged between the end wall and the electric core, wherein the first insulating part is provided with a second through hole;

[0008] A pole having a pole segment and a first connecting segment, wherein the pole segment of the pole passes through the second through hole and the first through hole; one end of the pole segment of the pole close to the electric core is connected with the first connecting segment; and a connecting seam is formed between the first connecting segment of the pole and the second through hole;

[0009] A first sealing ring and a first water-absorbing expansion ring are sleeved on the pole segment of the pole;

[0010] The first water-absorbing expansion ring is clamped between the first connecting segment and the first sealing ring, and at least part of the first sealing ring is clamped between the first water-absorbing expansion ring and the end wall.

[0011] Further, the orthographic projection of the connecting seam on a projection plane is located within the orthographic projection of the first water-absorbing expansion ring on the projection plane, the projection plane and a first direction are perpendicular to each other, and the first direction is the height of the electric core.

[0012] Further, the first through hole comprises a first hole section and a second hole section, the first hole section is arranged on the side of the end wall close to the battery cell; the inner circumferential wall of the first hole section and the inner circumferential wall of the second hole section are connected by a first step surface; at least part of the first sealing ring is clamped between the first water-absorbing and expanding ring and the first step surface.

[0013] Further, the column section comprises a first column section and a second column section connected in sequence, the first column section is connected with the first connecting section, and the first sealing ring comprises a first sealing section and a second sealing section; the first sealing section and the first water-absorbing and expanding ring are both sleeved on the first column section, and the first sealing section and the first water-absorbing and expanding ring are clamped between the second column section and the first connecting section; the second sealing section is accommodated in the second hole section, and the second sealing section is sleeved on the second column section.

[0014] Further, the first insulating member has a third surface arranged towards the end wall along a first direction, the third surface of the first insulating member is convexly provided with a second annular protrusion; part of the second through hole is formed in the second annular protrusion; the second annular protrusion is embedded in the first through hole; wherein the second through hole comprises a fourth hole section, a fifth hole section and a sixth hole section connected in sequence along the first direction, the first sealing section of the first sealing ring is accommodated in the fourth hole section; the first water-absorbing and expanding ring is accommodated in the fifth hole section, and the first connecting section of the pole and the inner circumferential side of the sixth hole section are in contact.

[0015] Further, a second insulating member is further included, the second insulating member is arranged on the side of the end wall away from the battery cell; the second insulating member is provided with a third through hole; the column section of the pole passes through the third through hole and is connected with the terminal.

[0016] Further, a second water-absorbing and expanding ring is further included, the second water-absorbing and expanding ring is sleeved on the column section of the pole, the second water-absorbing and expanding ring seals an annular gap between the outer circumferential side of the pole and the inner circumferential side of the third through hole, and the second water-absorbing and expanding ring is clamped between the terminal of the pole and the first sealing ring.

[0017] And / or, a third water-absorbing and expanding ring is further included, the third water-absorbing and expanding ring is sleeved on the column section of the pole, and the third water-absorbing and expanding ring is clamped between the second insulating member and the end wall.

[0018] Further, the second insulating member has a first surface arranged towards the end wall, the first surface of the second insulating member is convexly provided with an abutting portion; part of the third through hole is formed in the abutting portion; the abutting portion is embedded in the first through hole, the abutting portion and the first sealing ring are in contact, and the surface of the abutting portion arranged towards the first sealing ring is provided as a concave-convex matching surface.

[0019] Further, a third water-absorbing expansion ring is further included, the first through hole further includes a third hole section, the third hole section is arranged at the second side of the end wall, and an inner peripheral wall of the third hole section and an inner peripheral wall of the second hole section are connected through a second step surface; the third water-absorbing expansion ring is sleeved on the abutting portion of the second insulating member, and the third water-absorbing expansion ring is clamped between the second insulating member and the second step surface.

[0020] The application further provides a battery cell.

[0021] Compared with the prior art, the above technical scheme of the utility model has the following advantages:

[0022] 1) The battery cell and the electric device, the first water-absorbing expansion ring is arranged between the first sealing ring and the first connecting section of the pole, on the one hand, the first water-absorbing expansion ring can absorb water to be exuded from the battery, and the first water-absorbing expansion ring can also be used to press the first sealing ring to ensure the sealing property of the first sealing ring; on the other hand, the first water-absorbing expansion ring can make the first sealing ring farther away from the liquid in the battery, thereby relieving the erosion of the first sealing ring and prolonging the service life of the first sealing ring. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to make the content of the utility model more easily understood clearly, the utility model is further described in detail below according to the specific embodiments of the utility model and in combination with the drawings.

[0024] Figure 1 It is a structural schematic view of the battery cell of the battery in the utility model;

[0025] Figure 2 It is a structural schematic view of the end wall in the utility model;

[0026] Figure 3 It is a partial schematic view of the end wall in the utility model;

[0027] Figure 4 It is a structural schematic view of the pole in the utility model;

[0028] Figure 5 It is a structural schematic view of the first insulating member in the utility model;

[0029] Figure 6 It is a partial schematic view of the first insulating member in the utility model;

[0030] Figure 7 It is a structural schematic view of the second insulating member in the utility model.

[0031] The description reference signs are as follows: 1, end wall; 11, first through hole; 111, first hole section; 112, second hole section; 113, third hole section; 2, pole column; 21, first connecting section; 22, first column section; 23, second column section; 24, terminal; 3, first sealing ring; 31, first sealing section; 32, second sealing section; 4, first insulation piece; 41, second through hole; 411, fourth hole section; 412, fifth hole section; 413, sixth hole section; 5, second insulation piece; 51, abutting portion; 52, third through hole; 53, first annular protrusion; 54, first positioning groove; 6, first water absorption expansion ring; 7, second water absorption expansion ring; 8, third water absorption expansion ring. DETAILED DESCRIPTION

[0032] The utility model will be further explained in connection with the drawings and specific embodiments, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model.

[0033] Reference Figures 1 to 7 An embodiment of the battery monomer provided by the utility model is shown.

[0034] The above-mentioned battery monomer comprises:

[0035] The shell comprises an end wall 1, and the end wall 1 is provided with a first through hole 11;

[0036] The electric core (not shown in the drawing) is arranged in the shell;

[0037] The first insulation piece 4 is arranged between the end wall 1 and the electric core, and the first insulation piece 4 is provided with a second through hole 41;

[0038] The pole column 2 has a column section and a first connecting section 21, the column section of the pole column 2 passes through the second through hole 41 and the first through hole 11; one end of the column section of the pole column 2 close to the electric core is connected with the first connecting section 21; a connecting gap is formed between the first connecting section 21 of the pole column 2 and the second through hole 41;

[0039] The first sealing ring 3 and the first water absorption expansion ring 6 are sleeved on the column section of the pole column 2;

[0040] The first water absorption expansion ring 6 is clamped between the first connecting section 21 and the first sealing ring 3, and at least part of the first sealing ring 3 is clamped between the first water absorption expansion ring 6 and the end wall 1.

[0041] The shell surrounds a cavity, and the end wall 1 is located at the top or side of the cavity.

[0042] The above-mentioned electric core is the core component of the battery monomer, which is composed of four parts of positive electrode, negative electrode, diaphragm and electrolyte. The main function of the positive electrode is to accept electrons and release positive ions to perform oxidation reaction. The main function of the negative electrode is to release electrons and absorb positive ions to perform reduction reaction. The main function of the diaphragm is to isolate the positive and negative electrodes to prevent short circuit and overcharge and overdischarge and other safety problems. The main function of the electrolyte is to separate the positive and negative electrodes and help the transportation of positive and negative ions between the positive and negative electrodes.

[0043] The above-mentioned first insulation piece 4 is used to separate the electric core from the end wall 1, so that the electric core and the end wall cannot conduct electricity. The above-mentioned first insulation piece 4 is made of insulating material, such as plastic material. The above-mentioned first insulation piece is generally connected and fixed with the end wall.

[0044] The above-mentioned pole 2 connects the tab of the electric core and the external circuit. The above-mentioned pole 2 is made of conductive material, such as metal material. The above-mentioned pole 2 is generally insulated and sealed with the end wall 1.

[0045] The above-mentioned first sealing ring 3 is used to seal the gap between the pole 2 and the end wall 1. The above-mentioned first sealing ring 3 is made of elastic material, such as fluorine rubber material.

[0046] The above-mentioned first water absorption expansion ring 6 has the function of absorbing water, which is used to absorb the moisture inside the battery. The above-mentioned first water absorption expansion ring 6 is made of polyvinyl alcohol and other high molecular materials.

[0047] The above-mentioned first sealing ring 3 separates the inside and outside of the battery to prevent the water vapor outside the battery from entering the inside of the battery, causing the performance of the battery to decay. The first water absorption expansion ring 6 can absorb the trace amount of water formed by the reaction inside the battery and swell to a certain volume, greatly reducing the influence of the water content inside the battery on the service life and safety performance of the electric core.

[0048] In this embodiment, the first water absorption expansion ring 6 is arranged between the first sealing ring 3 and the first connecting section 21 of the pole 2. On the one hand, the first water absorption expansion ring 6 can absorb the water to be exuded from the inside of the battery, and the first water absorption expansion ring 6 can also be used to press the first sealing ring 3 by absorbing water and swelling, so as to ensure the sealing property of the first sealing ring. On the other hand, the first water absorption expansion ring 6 can make the first sealing ring 3 farther away from the liquid inside the battery, so as to relieve the erosion of the first sealing ring 3 and improve the service life of the first sealing ring 3.

[0049] Further, the orthographic projection of the connecting seam on the projection plane is located in the orthographic projection of the first water absorption expansion ring 6 on the projection plane. The projection plane and the first direction are perpendicular to each other, and the first direction is the height of the electric core.

[0050] The connection seam is formed between the first connecting section 21 of the pole 2 and the second through hole 41 of the first insulating member 4, and liquid in the battery can seep out from the connection seam. Over time, the first sealing ring 3 can be eroded and fail. Therefore, in addition to keeping the first sealing ring 3 away from the liquid in the battery, the design of the connection seam is such that the orthographic projection of the connection seam on the projection plane is located within the orthographic projection of the first water-absorbing expansion ring 6 on the projection plane. The first water-absorbing expansion ring 6 blocks the small amount of liquid in the battery that seeps out from the connection seam, thereby ensuring that the moisture in the battery can be absorbed while preventing the liquid in the battery from eroding the first sealing ring, thereby prolonging the service life of the first sealing ring.

[0051] In the embodiment, the first through hole 11 includes a first hole section 111 and a second hole section 112. The first hole section 111 is arranged on the side of the end wall 1 close to the battery cell. The inner peripheral wall of the first hole section 111 and the inner peripheral wall of the second hole section 112 are connected by a first step surface. At least part of the first sealing ring 3 is clamped between the first water-absorbing expansion ring 6 and the first step surface.

[0052] The first through hole 11 of the end wall 1 is a stepped hole. The hole diameter of the first hole section 111 is larger than the hole diameter of the second hole section 112, thereby forming a first step surface between the two. The first step surface faces the direction in which the first insulating member 4 is located. The first sealing ring 3 and the first water-absorbing expansion ring 6 are clamped between the first step surface and the first connecting section 21 of the pole 2, thereby achieving planar sealing.

[0053] Further, the pole section includes a first pole section 22 and a second pole section 23 connected in sequence. The first pole section 22 is connected to the first connecting section 21. The first sealing ring 3 includes a first sealing section 31 and a second sealing section 32. The first sealing section 31 and the first water-absorbing expansion ring 6 are both sleeved on the first pole section 22. The first sealing section 31 and the first water-absorbing expansion ring 6 are clamped between the second pole section 23 and the first connecting section 21. The second sealing section 32 is accommodated in the second hole section 112, and the second sealing section 32 is sleeved on the second pole section 23.

[0054] The outer diameters of the second pole section 23 of the pole 2 and the first connecting section 21 of the pole 2 are both larger than the outer diameter of the first pole section 22 of the pole 2. Therefore, an annular groove is formed between the second pole section 23 and the first connecting section 21 of the pole 2. After the first sealing ring 3 is compressed in place, the inner ring portion of the first sealing section 31 is embedded in the annular groove, and the second sealing section 32 of the first sealing ring 3 is embedded between the second pole section 23 and the second hole section 112, thereby achieving better sealing effect. For the first water-absorbing expansion ring 6, the inner ring of the first water-absorbing expansion ring 6 is positioned and installed by the first pole section 22.

[0055] In the embodiment, the first insulation member 4 has a third surface arranged towards the end wall 1 along the first direction, and the third surface of the first insulation member 4 is provided with a second annular protrusion 42; the second through hole 41 is formed in the second annular protrusion 42; the second annular protrusion 42 is embedded in the first through hole 11; specifically, the second annular protrusion 42 is embedded in the first hole section 111 and abuts against the first step surface, thereby achieving quick installation of the first insulation member 4 and the end wall 1.

[0056] The second through hole 41 includes a fourth hole section 411, a fifth hole section 412 and a sixth hole section 413 connected in sequence along the first direction, and the first sealing section 31 of the first sealing ring 3 is accommodated in the fourth hole section 411; the first water-absorbing expansion ring 6 is accommodated in the fifth hole section 412, and the first connecting section 21 of the pole 2 contacts the inner peripheral side of the sixth hole section 413.

[0057] The hole diameters of the fifth hole section 412 and the sixth hole section 413 are both greater than that of the fourth hole section 411, a third step surface is formed between the fourth hole section 411 and the fifth hole section 412, a fourth step surface is formed between the sixth hole section 413 and the fifth hole section 412, the inner ring main part of the first water-absorbing expansion ring 6 is clamped between the first sealing ring 3 and the first connecting section 21, and the outer ring edge part of the first water-absorbing expansion ring 6 is clamped between the third step surface and the fourth step surface. The first sealing ring 3 and the first water-absorbing expansion ring 6 contact the end wall 1, the first insulation member 4 and the pole 2, and the gap therebetween can be well sealed. In addition, the design that the first connecting section 21 of the pole 2 contacts the inner peripheral side of the sixth hole section 413 can reduce the leakage of liquid in the battery from between the first connecting section 21 of the pole 2 and the second through hole 41, thereby protecting the first sealing ring 3.

[0058] In the embodiment, the second insulation member 5 is further included, the second insulation member 5 is arranged on the side of the end wall 1 away from the battery cell, the second insulation member 5 is provided with a third through hole 52, and the pole 2 passes through the third through hole 52 and is connected with the terminal 24.

[0059] Since the positive pole and the negative pole are generally mounted on the end wall 1, in general, one of the positive pole and the negative pole directly contacts the end wall 1, and the other needs to be arranged in insulation from the end wall 1, otherwise a short circuit of the battery will be caused. The second insulation member 5 separates the pole 2 from the end wall 1, thereby achieving electrical isolation of the pole 2 from the end wall 1 and preventing a short circuit of the battery.

[0060] In the embodiment, a second water-absorbing expansion ring 7 is further included, which is sleeved on the column segment of the pole 2, seals the annular gap between the outer circumferential side of the pole 2 and the inner circumferential side of the third through hole 52, and is clamped between the terminal 24 of the pole 2 and the first sealing ring 3.

[0061] The terminal 24 of the pole 2 is connected with the second column segment 23, and the outer diameter of the terminal 24 is greater than the outer diameter of the second column segment 23. The second water-absorbing expansion ring 7 has a water-absorbing function for absorbing water from outside of the battery, and is made of a high polymer material such as polyvinyl alcohol. The second water-absorbing expansion ring 7 can absorb water from outside of the battery, prevent the water from outside from entering the battery, and prevent water vapor from entering from the gap between the second insulating member 5 and the pole 2.

[0062] In the embodiment, the first surface of the second insulating member 5 is provided towards the end wall 1, and the first surface of the second insulating member 5 is provided with an abutting portion 51. The third through hole 52 is formed in the abutting portion 51. The abutting portion 51 is inserted into the first through hole 11, and the abutting portion 51 is in contact with the first sealing ring 3. The surface of the abutting portion 51 towards the first sealing ring 3 is provided as a concave-convex matching surface.

[0063] The main part of the first surface of the second insulating member 5 is in abutment with the end wall 1, and the abutting portion 51 is inserted into the first through hole. The concave-convex matching surface is provided, and when the matching surface is pressed against the first sealing ring 3, a tortuous gap is formed between the matching surface and the first sealing ring 3, which makes it more difficult for water vapor to pass through the tortuous gap. The abutting portion 51 of the second insulating member 5 is positioned with the end wall 1 to prevent misalignment between the two. The concave-convex matching surface of the abutting portion 51 is in contact with the first sealing ring 3, and the sealing connection between the first sealing ring 3 and the abutting portion 51 is better.

[0064] In the embodiment, a third water-absorbing expansion ring 8 is further included, and the first through hole 11 further includes a third hole segment 113. The third hole segment 113 is provided on the second side of the end wall 1, and the inner circumferential wall of the third hole segment 113 and the inner circumferential wall of the second hole segment 112 are connected by a second step surface. The third water-absorbing expansion ring 8 is sleeved on the abutting portion 51 of the second insulating member 5, and the third water-absorbing expansion ring 8 is clamped between the second insulating member 5 and the second step surface.

[0065] The third hole section 113, the second hole section 112 and the first hole section 111 are connected in sequence, the hole diameter of the third hole section 113 is larger than the hole diameter of the second hole section 112, thus forming a second step surface. The third water absorption expansion ring 8 has a water absorption function, for absorbing moisture from outside the battery, the third water absorption expansion ring 8 is made of a high polymer material such as polyvinyl alcohol. The third water absorption expansion ring 8 can prevent water vapor from outside the battery from entering the gap between the second insulating part 5 and the end wall 1, and the second step surface of the end wall 1 can position the third water absorption expansion ring 8 to prevent mispositioning of the third water absorption expansion ring 8.

[0066] The application further provides a power utilization device, characterized in that the power utilization device comprises the battery cell. The power utilization device can be a car, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. The car can be a fuel car, a gas car, or a new energy car, and the new energy car can be a pure electric car, a hybrid car, or a range extended car, or the like. The spacecraft includes an airplane, a rocket, a space shuttle, a spacecraft, or the like. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric airplane toy, or the like. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, an electric planer, or the like. The embodiments of the application do not specially limit the power utilization device.

[0067] Obviously, the above embodiments are merely exemplary and are not intended to limit the application. Based on the above description, those skilled in the art can make other variations and changes to the application. Here, it is not necessary or possible to enumerate all the embodiments. The obvious variations and changes derived therefrom are still within the protection scope of the application.

Claims

1. A battery cell, characterized by, The application relates to a battery cell, which comprises the following parts: a shell comprising an end wall (1) provided with a first through hole (11); an electric core arranged in the shell; a first insulating part (4) arranged between the end wall (1) and the electric core, the first insulating part (4) being provided with a second through hole (41); a pole column (2) having a column section and a first connecting section (21), the column section of the pole column (2) penetrating the second through hole (41) and the first through hole (11); one end of the column section of the pole column (2) close to the electric core is connected with the first connecting section (21); a connecting gap is formed between the first connecting section (21) of the pole column (2) and the second through hole (41); a first sealing ring (3) and a first water-absorbing expansion ring (6) sleeved on the column section of the pole column (2); wherein the first water-absorbing expansion ring (6) is clamped between the first connecting section (21) and the first sealing ring (3), and at least part of the first sealing ring (3) is clamped between the first water-absorbing expansion ring (6) and the end wall (1).

2. The battery cell of claim 1, wherein, The orthographic projection of the connecting gap on a projection plane is located in the orthographic projection of the first water-absorbing expansion ring (6) on the projection plane, the projection plane and a first direction are perpendicular to each other, and the first direction is the height of the electric core.

3. The battery cell according to claim 1 or 2, characterized in that, The first through hole (11) comprises a first hole section (111) and a second hole section (112), the first hole section (111) is arranged on the side of the end wall (1) close to the electric core; the inner peripheral wall of the first hole section (111) and the inner peripheral wall of the second hole section (112) are connected through a first step surface; and at least part of the first sealing ring (3) is clamped between the first water-absorbing expansion ring (6) and the first step surface.

4. The battery cell of claim 3, wherein, The column section comprises a first column section (22) and a second column section (23) connected in sequence, the first column section (22) is connected with the first connecting section (21), and the first sealing ring (3) comprises a first sealing section (31) and a second sealing section (32); wherein the first sealing section (31) and the first water-absorbing expansion ring (6) are both sleeved on the first column section (22), and the first sealing section (31) and the first water-absorbing expansion ring (6) are clamped between the second column section (23) and the first connecting section (21); the second sealing section (32) is accommodated in the second hole section (112), and the second sealing section (32) is sleeved on the second column section (23).

5. The battery cell of claim 3, wherein, The first insulating piece (4) has a third surface arranged towards the end wall (1) in the first direction, and the third surface of the first insulating piece (4) is convexly provided with a second annular protrusion (42); part of the second through hole (41) is formed in the second annular protrusion (42); the second annular protrusion (42) is embedded in the first through hole (11); wherein the second through hole (41) comprises a fourth hole section (411), a fifth hole section (412) and a sixth hole section (413) which are sequentially communicated in the first direction, and the first sealing section (31) of the first sealing ring (3) is accommodated in the fourth hole section (411); the first water-absorbing expansion ring (6) is accommodated in the fifth hole section (412), and the first connecting section (21) of the pole (2) and the inner peripheral side of the sixth hole section (413) are in contact.

6. The battery cell of claim 3, wherein, Further comprising a second insulating piece (5) arranged on the side of the end wall (1) away from the battery cell; the second insulating piece (5) is provided with a third through hole (52); the pole section of the pole (2) passes through the third through hole (52) and is connected with the terminal (24).

7. The battery cell of claim 6, wherein, Further comprising a second water-absorbing expansion ring (7) sleeved on the pole section of the pole (2), the second water-absorbing expansion ring (7) seals the annular gap between the outer peripheral side of the pole (2) and the inner peripheral side of the third through hole (52), and the second water-absorbing expansion ring (7) is clamped between the terminal (24) of the pole (2) and the first sealing ring (3); And / or further comprising a third water-absorbing expansion ring (8) sleeved on the pole section of the pole (2), and the third water-absorbing expansion ring (8) is clamped between the second insulating piece (5) and the end wall (1).

8. The battery cell of claim 6, wherein, The second insulating piece (5) has a first surface arranged towards the end wall (1), and the first surface of the second insulating piece (5) is convexly provided with an abutting portion (51); part of the third through hole (52) is formed in the abutting portion (51); the abutting portion (51) is embedded in the first through hole (11), the abutting portion (51) and the first sealing ring (3) are in contact, and the surface of the abutting portion (51) arranged towards the first sealing ring (3) is provided as a concave-convex matching surface.

9. The battery cell of claim 8, wherein, Further comprising a third water-absorbing expansion ring (8), and the first through hole (11) further comprises a third hole section (113) arranged on the second side of the end wall (1), and the inner peripheral wall of the third hole section (113) and the inner peripheral wall of the second hole section (112) are connected by a second step surface; the third water-absorbing expansion ring (8) is sleeved on the abutting portion (51) of the second insulating piece (5), and the third water-absorbing expansion ring (8) is clamped between the second insulating piece (5) and the second step surface.

10. An electric device, characterized by The battery cell of claim 9 is included.

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