CN212625796U

CN212625796U - Electronic device

Info

Publication number: CN212625796U
Application number: CN202021654218.6U
Authority: CN
Inventors: 刘亮亮; 祝媛; 刘建华; 刘金成
Original assignee: Huizhou Yiwei Energy Battery Co ltd; Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2020-08-10
Filing date: 2020-08-10
Publication date: 2021-02-26
Anticipated expiration: 2030-08-10

Abstract

The utility model discloses an electronic device, including shell and the electric core of setting in the shell, the shell includes drain pan and apron, the drain pan includes the bottom plate and encloses the leg of establishing in bottom plate one side, the one end of bottom plate is kept away from to the leg welding, in order to seal up electric core in the drain pan, set up the mounting hole on the apron, the medial surface of the pore wall perpendicular to apron of mounting hole, insulating connection has the electrode connecting piece of shutoff mounting hole in the mounting hole, the electrode connecting piece includes the limiting plate, one side of limiting plate is fixed with conical spliced pole, the spliced pole has the first end of being connected with the limiting plate and holds with the second relative of first end, the cross sectional dimension of first end is less than the cross sectional dimension that the second held, the limiting plate is located the lateral surface of apron, the spliced pole is pegged graft with the. The utility model discloses an electron device sealing reliability is high, and the processing degree of difficulty is low, and electron device is capacious, and the security is high.

Description

Electronic device

Technical Field

The utility model relates to an electronic equipment technical field especially relates to an electronic device.

Background

At present, the battery of crust structure adopts the extrusion mode to seal usually, and this battery includes drain pan, block and electric core, and drain pan and block are one end and seal one end open-ended shell structure, and the drain pan includes that bottom plate and ring establish the first leg in bottom plate one side, and the block includes that roof and ring establish the second leg in roof one side, and during drain pan and cap equipment, outside first leg was located to the second leg cover, was provided with the sealing washer between two legs. During the equipment, put electric core in the drain pan, sheathe the sealing washer on the first leg of drain pan, annotate the back and assemble block and drain pan again to by outer to interior extrusion second leg and first leg, make two legs support tight sealing washer and realize sealedly. The prior art has the following defects: 1. the side edge extrusion sealing mode enables the internal space of the battery to be occupied by the extruded and deformed structure, and the battery capacity is reduced; 2. the sealing reliability of the extrusion sealing mode is poor; 3. the side extrusion sealing mode reduces the safety of the battery, and the extrusion sealing battery is not easy to open and has no explosion-proof effect.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an aim at: provided is an electronic device having high sealing reliability, low processing difficulty, large electronic device capacity, and high safety.

To achieve the purpose, the embodiment of the present invention adopts the following technical solutions:

the utility model provides an electronic device, including shell and the electric core of setting in the shell, the shell includes drain pan and apron, the drain pan includes the bottom plate and encloses the leg of establishing in bottom plate one side, the cover plate welding is in the one end that the bottom plate was kept away from to the leg, in order to seal up the electric core in the drain pan, set up the mounting hole on the apron, the pore wall of mounting hole is perpendicular to the medial surface of apron, insulating connection has the electrode connecting piece of shutoff the mounting hole in the mounting hole, the electrode connecting piece includes the limiting plate, one side of limiting plate is fixed with conical spliced pole, the spliced pole has the first end of being connected with the limiting plate and the second end relative with the first end, the cross sectional dimension of first end is less than the cross sectional dimension of second end, the limiting plate is located the lateral surface of apron, the spliced pole with the mounting hole grafting, one lug of the battery cell is connected with the bottom shell, and the other lug of the battery cell is connected with the connecting column.

As a preferable aspect of the electronic device, the thickness of the stopper plate is smaller than the thickness of the housing.

As an electron device's an preferred scheme, the electrode connecting piece through insulating sealing washer with the apron is connected, the sealing washer is established including the cover the sealed body of the periphery of spliced pole, the lateral wall of sealed body supports tightly the pore wall of mounting hole, sealed body is close to the one end orientation of limiting plate is kept away from one side at sealed body center is extended and is formed with first sealing, first sealing presss from both sides and locates the limiting plate with between the apron.

As a preferable scheme of the electronic device, a convex ring is formed by extending a hole wall of the mounting hole towards the inside of the bottom case, a second sealing portion is formed by extending one end of the sealing body, which is far away from the first sealing portion, towards one side, which is far away from the center of the sealing body, and the second sealing portion abuts against an end surface of the convex ring.

As a preferred scheme of the electronic device, the battery cell is a winding battery cell, a through hole is formed in the middle of the winding battery cell in a penetrating manner, the mounting hole is opposite to the through hole, and the second end of the connecting column is located in the through hole.

As a preferable scheme of the electronic device, the cover plate includes a plate body, a first abutting portion extends from the periphery of the plate body to a side away from the battery core, and the first abutting portion abuts against the inner side wall of the enclosure wall and is welded to the enclosure wall.

As a preferable scheme of the electronic device, a second abutting portion extends from one end of the first abutting portion, which is far away from the board body, toward one side, which is far away from the center of the board body, and the second abutting portion abuts against an end face of one end, which is far away from the bottom board, of the surrounding wall.

As an optimal scheme of the electronic device, the battery cell is a winding battery cell, a through hole is formed in the middle of the winding battery cell in a penetrating mode, a liquid injection hole is formed in the bottom plate corresponding to the through hole, and the liquid injection hole is blocked through a blocking piece.

As an optimized scheme of the electronic device, the plugging piece comprises a plugging body, one side of the plugging body, which is close to the bottom plate, is convexly provided with a convex part which is in plug-in fit with the liquid injection hole, and the plugging body is welded on one side surface, which is far away from the surrounding wall, of the bottom plate.

As a preferred scheme of the electronic device, at least two circles of welding seams surrounding the liquid injection hole are arranged on the plugging body and in the overlapped area of the plugging body and the bottom plate, the two circles of welding seams are arranged at intervals along the radial direction of the liquid injection hole, and at least one circle of welding seams are continuous welding seams.

As a preferred scheme of the electronic device, two circles of welding seams are arranged on the plugging body and respectively comprise an outer circle welding seam and an inner circle welding seam, the inner circle welding seam is formed by welding intermittently along the central ring of the liquid injection hole, and the outer circle welding seam is formed by welding continuously along the central ring of the liquid injection hole.

As a preferable scheme of the electronic device, a groove is concavely arranged at a position of the plugging body, which is far away from one side surface of the convex part and corresponds to the convex part, the groove extends into the convex part, and an explosion-proof notch is arranged in the groove.

The utility model discloses beneficial effect does: the bottom shell and the cover plate are welded, so that the integral sealing effect of the electronic device is greatly improved, extrusion sealing is not needed, the space in the battery shell is not occupied, and the capacity of the battery is effectively improved; through setting up the electrode connecting piece into limiting plate and conical spliced pole integrated configuration, the first end of the great size of electrode connecting piece can play certain limiting displacement to the electrode connecting piece, can cooperate insulating material to fix in the mounting hole steadily, and when the inside pressure of battery was too big, because the pore wall perpendicular to apron's of mounting hole medial surface, therefore inside great atmospheric pressure can also promote this electrode connecting piece and break away from the apron, but electron device's safety in utilization promotes.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Fig. 1 is a schematic cross-sectional view of an electronic device according to an embodiment of the present invention.

Fig. 2 is a schematic sectional view of the cover plate, the electrode connecting member and the sealing ring according to the embodiment of the present invention after assembly.

Fig. 3 is a schematic cross-sectional view of a cover plate according to an embodiment of the present invention.

Fig. 4 is a schematic cross-sectional view of a bottom case according to an embodiment of the present invention.

Fig. 5 is a cross-sectional view of the cover plate, the electrode connecting member, the sealing ring, and the battery cell of the embodiment of the present invention after assembly.

Fig. 6 is a schematic cross-sectional view of an electronic device according to an embodiment of the present invention (the block piece is not shown).

In the figure:

1. an electric core; 11. a through hole; 12. a positive tab; 13. a negative tab; 2. a bottom case; 21. a base plate; 22. a surrounding wall; 23. a liquid injection hole; 3. a cover plate; 31. mounting holes; 32. a convex ring; 33. a plate body; 34. a first abutting portion; 35. a second abutting part; 4. an electrode connecting member; 41. a limiting plate; 42. connecting columns; 421. a second end; 5. a seal ring; 51. a seal body; 52. a first seal portion; 53. a second seal portion; 6. a blocking member; 61. plugging the body; 62. a convex portion; 63. an outer ring weld; 64. inner ring welding seams; 65. a groove; 66. explosion-proof nicking; 7. an adapter; 71. a first plate; 72. a second plate.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1 to 6, an electronic device according to an embodiment of the present invention includes a housing and an electric core 1 disposed in the housing, the housing includes a bottom case 2 and a cover plate 3, the bottom case 2 includes a bottom plate 21 and a surrounding wall 22 surrounding one side of the bottom plate 21, the cover plate 3 is welded to one end of the surrounding wall 22 away from the bottom plate 21, so as to seal the electric core 1 in the bottom case 2, a mounting hole 31 is formed in the cover plate 3, a hole wall of the mounting hole 31 is perpendicular to an inner side surface of the cover plate 3, an electrode connecting member 4 blocking the mounting hole 31 is connected in the mounting hole 31 in an insulating manner, the electrode connecting member 4 includes a limiting plate 41, a tapered connecting column 42 is fixed to one side of the limiting plate 41, the connecting column 42 has a first end connected to the limiting plate 41 and a second end 421 opposite to the first end, a cross-sectional dimension of the first end is smaller than a cross-sectional dimension of the, the limiting plate 41 is located on the outer side surface of the cover plate 3, the connecting column 42 is inserted into the mounting hole 31, one tab of the battery cell 1 is connected with the bottom case 2, and the other tab is connected with the connecting column 42. The bottom shell 2 and the cover plate 3 are welded, so that the overall sealing effect of the electronic device is greatly improved, extrusion sealing is not needed, the space in the battery shell is not occupied, and the capacity of the battery is effectively improved; through setting up electrode connecting piece 4 to limiting plate 41 and conical spliced pole 42 integrated configuration, the great big size second end 421 of electrode connecting piece 4 can play certain limiting displacement to electrode connecting piece 4, can cooperate insulating material to fix steadily in mounting hole 31, and when the inside pressure of battery was too big, because the pore wall perpendicular to apron 3's of mounting hole 31 medial surface, therefore inside great atmospheric pressure can also promote this electrode connecting piece 4 and break away from apron 3, promotes electron device's safety in utilization.

The electronic device may be a rechargeable battery (e.g., a lithium ion battery), a non-rechargeable battery (e.g., a lithium battery), a capacitor, or the like.

In the present embodiment, the battery cell 1 of the electronic device has a positive tab 12 and a negative tab 13, wherein the positive tab 12 is welded to the end surface of the second end 421, and the negative tab 13 is welded to the inner side wall of the bottom case 2 or the cover plate 3 or the bottom plate 21. Of course, the positions of connection of positive tab 12 and negative tab 13 may also be interchanged, that is, positive tab 12 is welded to the inner side wall of bottom case 2 (the inner side wall of bottom plate 21 or the inner side wall of peripheral wall 22 of bottom case 2) or cover plate 3, and negative tab 13 is welded to the end face of second end 421.

In the present embodiment, the thickness of the restriction plate 41 is smaller than that of the housing. This design can guarantee that limiting plate 41 preferentially deforms to relieve pressure when there is pressure inside the electronic device. Preferably, the thickness of the restriction plate 41 is smaller than that of the cover plate 3.

In one embodiment, the electrode connector 4 is connected to the cover plate 3 by an insulating sealing ring 5. The sealing ring 5 is connected with the electrode connecting piece 4, so that the fixing difficulty of the electrode connecting piece 4 can be reduced, the sealing effect and the insulating effect are ensured, the sealing ring 5 can be manufactured and molded independently, the manufacturing cost is reduced, and the integral manufacturing and assembling efficiency of an electronic device is improved.

In this embodiment, the sealing ring 5 includes a sealing body 51 sleeved on the periphery of the connecting column 42, an outer side wall of the sealing body 51 abuts against a hole wall of the mounting hole 31, one end of the sealing body 51 close to the limiting plate 41 extends towards one side far away from the center of the sealing body 51 to form a first sealing portion 52, and the first sealing portion 52 is clamped between the limiting plate 41 and the cover plate 3. The limiting plate 41 can limit the installation position of the electrode connector 4, and the whole electrode connector 4 is conductive because the electricity of the battery cell 1 needs to be conducted out, so the first sealing part 52 can achieve good electrical insulation between the limiting plate 41 and the cover plate 3.

The hole wall of the mounting hole 31 extends towards the inside of the bottom case 2 to form a convex ring 32, one end of the sealing body 51 far away from the first sealing part 52 extends towards one side far away from the center of the sealing body 51 to form a second sealing part 53, and the second sealing part 53 abuts against the end surface of the convex ring 32. By arranging the convex ring 32, the matching length of the mounting hole 31 and the connecting column 42 can be increased, meanwhile, the wall thickness of the cover plate 3 cannot be increased, the sealing stability is improved, and the manufacturing cost is reduced; through setting up second sealing 53, can utilize second sealing 53 to carry on spacingly to sealing washer 5, further prevent that sealing washer 5 from breaking away from apron 3, also can further prevent that electrode connecting piece 4 from breaking away from mounting hole 31 at will simultaneously.

In other embodiments, the electrode connecting member 4 is not limited to be installed by providing the sealing ring 5, but the electrode connecting member 4 may be directly fitted into the installation hole 31 of the cap plate 3, and then the electrode connecting member 4 is insulated and connected to the cap plate 3 by filling the sealing compound.

In an embodiment, the cover plate 3 includes a plate body 33, a first abutting portion 34 extends from the periphery of the plate body 33 to a side away from the battery cell 1, and the first abutting portion 34 abuts against the inner side wall of the surrounding wall 22 and is welded to the surrounding wall 22. The arrangement of the first abutting portion 34 can increase the welding area between the cover plate 3 and the surrounding wall 22, improve the sealing effect, and reduce the manufacturing cost without increasing the thickness of the cover plate 3.

In this embodiment, a second abutting portion 35 extends from one end of the first abutting portion 34 away from the plate body 33 to a side away from the center of the plate body 33, and the second abutting portion 35 abuts against an end surface of one end of the surrounding wall 22 away from the bottom plate 21. The second supports the setting of tight portion 35 and can prescribe a limit to the mounted position of apron 3, when apron 3 pegs graft in the leg 22 of drain pan 2, if the second supports the end face that tight portion 35 supported leg 22, explains that apron 3 installs to target in place and can weld, has reduced the installation degree of difficulty of apron 3 effectively.

In an embodiment, the battery cell 1 is a winding battery cell 1, a through hole 11 is formed through the middle of the winding battery cell 1, the mounting hole 31 faces the through hole 11, and the second end 421 of the connection post 42 is located in the through hole 11. Through inserting spliced pole 42's second end 421 into coiling formula electricity core 1's through-hole 11 in, can make coiling formula electricity core 1's up end be as close as possible to the medial surface in apron 3 for shell inner space utilization is high, effectively promotes electronic device's capacity.

In other embodiments, the battery cell 1 is not limited to a winding battery cell 1, and may also be a laminated battery cell 1.

The bottom plate 21 is provided with a liquid injection hole 23 corresponding to the through hole 11, and the liquid injection hole 23 is blocked by a blocking piece 6. Through will annotating liquid hole 23 and set up in the position that bottom plate 21 corresponds through-hole 11, can utilize through-hole 11 to hold electrolyte during notes liquid, shorten and annotate the liquid time, in addition, through-hole 11 can also hold shutoff piece 6, prevents that shutoff piece 6 from occupying the space of other positions, and the area of rational utilization through-hole 11 has promoted electron device's inner space utilization.

The plugging piece 6 comprises a plugging body 61, one side of the plugging body 61 close to the bottom plate 21 is convexly provided with a convex part 62 which is in plug-in fit with the liquid injection hole 23, and the plugging body 61 is welded on one side of the bottom plate 21 far away from the surrounding wall 22. This design ensures both the sealing of the pour hole 23 and the stable fixing of the block piece 6 to the bottom plate 21.

In this embodiment, at least two circles of welding seams surrounding the liquid injection hole 23 are arranged on the plugging body 61 and in the overlapped area of the plugging body 61 and the bottom plate 21, the two circles of welding seams are arranged at intervals along the radial direction of the liquid injection hole 23, and at least one circle of welding seams are continuous welding seams. The continuous welding formed by continuous welding, namely the continuous welding seam, can improve the sealing and fixing effects.

Preferably, two circles of welding seams, namely an outer circle welding seam 63 and an inner circle welding seam 64, are arranged on the plugging body 61, the inner circle welding seam 64 is formed by welding discontinuously along the central ring shape of the liquid injection hole 23, and the outer circle welding seam 63 is formed by welding continuously along the central ring shape of the liquid injection hole 23. Through setting up inner circle welding seam 64 to discontinuous welding seam form for shutoff piece 6 both can regard as the structure of shutoff notes liquid hole 23, can regard as explosion-proof valve structure again, promotes electron device's safety in utilization. In the actual use process of the electronic device, the explosion prevention can be realized on one side where the electronic device cover plate 3 is positioned, the explosion prevention can be realized on one side where the bottom plate 21 is positioned, and the safety of the electronic device is greatly improved. In addition, the inner ring welding seam 64 is discontinuously welded, the outer ring welding seam 63 is continuously welded, so that the strength of the position of the inner ring welding seam 64 is lower than that of the outer ring welding seam 63, and multistage explosion prevention can be realized by punching the welding seams at different positions under different pressures according to electronic devices, for example, when the pressure is in a first-stage state, the inner ring welding seam 64 is firstly punched, part of the sealing body 61 and the bottom plate 21 are separated, the internal pressure of the electronic devices is reduced, and when the pressure is in a second-stage state, the outer ring welding seam 63 is punched, so that comprehensive pressure relief of the electronic devices is realized.

Furthermore, a groove 65 is concavely arranged on one side surface of the blocking body 61 away from the convex part 62 and corresponding to the convex part 62, the groove 65 extends into the convex part 62, and an anti-explosion notch 66 is arranged in the groove 65.

In the present embodiment, the blocking body 61 is integrally formed with the protrusion 62 by stamping, and the explosion-proof score 66 is provided at the weak position of the protrusion 62, for example, the corner position of the protrusion 62.

Specifically, the utility model discloses electronic device's assembly process as follows:

step S100, assembling the cover plate 3, the electrode connecting piece 4 and the sealing ring 5 into a component;

step S200, assembling the winding type battery cell 1 and the assembly into a whole, that is: welding one tab (positive tab 12/negative tab 13) of the winding type battery cell 1 with the end surface of the second end 421 of the connecting column 42 of the electrode connecting piece 4;

step S300, welding the other tab (positive tab 12/negative tab 13) of the winding type battery cell 1 with the cover plate 3, assembling the winding type battery cell 1 and the assembly in the bottom case 2 together, and welding the cover plate 3 with the surrounding wall 22 of the bottom case 2;

or the other tab (the positive tab 12/the negative tab 13) is folded and attached to the outer side wall of the winding type battery cell 1, then the winding type battery cell 1 and the assembly are assembled in the bottom case 2 together, the cover plate 3 is welded with the leg 22 of the bottom case 2, and the negative tab 13 is welded with the leg 22 of the bottom case 2;

of course, another tab of the winding-type battery cell 1 may also be welded to the bottom plate 21 of the bottom case 2, and then the cover plate 3 may be welded to the leg 22 of the bottom case 2;

step S400, injecting liquid from the liquid injection hole 23, forming, then sealing the liquid injection hole 23 through the sealing piece 6, and finally welding the sealing piece 6 on the bottom plate 21 of the bottom shell 2 to realize fixing.

Preferably, in step S300, one tab (for example, the negative tab 13) is welded to the cover plate 3 through the adaptor 7, the adaptor 7 includes a first plate 71 and a second plate 72 that are vertically connected, where one side surface of the first plate 71 abuts against an outer side wall of the winding type cell 1 and is welded to the negative tab 13, the other side surface abuts against an inner side wall of the surrounding wall 22 of the bottom case 2, and the second plate 72 is welded to one side surface of the cover plate 3 that is close to the winding type cell 1. Through setting up adaptor 7, can be connected negative pole ear 13 with negative pole ear 13 and apron 3 fixedly before assembling to drain pan 2 with negative pole ear 13, and after coiling formula electricity core 1 assembles in drain pan 2, first board 71 of adaptor 7 combines leg 22 of drain pan 2 and the lateral wall of coiling formula electricity core 1 to press from both sides negative pole ear 13 tight, prevents that negative pole ear 13 and first board 71 welded position from being dragged and become flexible.

In the description herein, it is to be understood that the terms "upper" and the like are used in a descriptive sense and based on the orientation or positional relationship shown in the drawings for convenience in description and simplicity of operation, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, configuration and operation in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description herein, references to the description of "an embodiment" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims

1. An electronic device comprises a shell and an electric core arranged in the shell, and is characterized in that the shell comprises a bottom shell and a cover plate, the bottom shell comprises a bottom plate and a surrounding wall arranged on one side of the bottom plate, the cover plate is welded at one end, far away from the bottom plate, of the surrounding wall so as to seal the electric core in the bottom shell, a mounting hole is formed in the cover plate, the hole wall of the mounting hole is perpendicular to the inner side surface of the cover plate, an electrode connecting piece for plugging the mounting hole is connected in the mounting hole in an insulating mode, the electrode connecting piece comprises a limiting plate, a conical connecting column is fixed on one side of the limiting plate, the connecting column is provided with a first end connected with the limiting plate and a second end opposite to the first end, the cross-sectional dimension of the first end is smaller than that of the second end, and the limiting plate is, the connecting column is inserted into the mounting hole, one lug of the battery cell is connected with the bottom shell, and the other lug of the battery cell is connected with the connecting column.

2. The electronic device of claim 1, wherein a thickness of the stopper plate is less than a thickness of the housing.

3. The electronic device according to claim 1, wherein the electrode connecting member is connected to the cover plate through an insulating sealing ring, the sealing ring includes a sealing body sleeved on the periphery of the connecting post, an outer side wall of the sealing body abuts against a hole wall of the mounting hole, one end of the sealing body close to the limiting plate extends towards one side away from the center of the sealing body to form a first sealing portion, and the first sealing portion is clamped between the limiting plate and the cover plate.

4. The electronic device according to claim 3, wherein a convex ring is formed by extending a hole wall of the mounting hole towards the inside of the bottom case, and a second sealing portion is formed by extending an end of the sealing body away from the first sealing portion towards a side away from the center of the sealing body, and the second sealing portion abuts against an end surface of the convex ring.

5. The electronic device according to claim 1, wherein the electric core is a winding electric core, a through hole is formed through a middle portion of the winding electric core, the mounting hole faces the through hole, and the second end of the connecting column is located in the through hole.

6. The electronic device according to claim 1, wherein the cover plate includes a plate body, a first abutting portion extends from an outer periphery of the plate body toward a side away from the battery cell, and the first abutting portion abuts against an inner side wall of the surrounding wall and is welded to the surrounding wall.

7. The electronic device according to claim 6, wherein a second abutting portion extends from one end of the first abutting portion away from the board body toward a side away from a center of the board body, and the second abutting portion abuts against an end surface of the end of the surrounding wall away from the bottom plate.

8. The electronic device according to any one of claims 1 to 7, wherein the electric core is a coiled electric core, a through hole is formed through a middle portion of the coiled electric core, a liquid injection hole is formed in the bottom plate corresponding to the through hole, and the liquid injection hole is blocked by a blocking member.

9. The electronic device according to claim 8, wherein the sealing member comprises a sealing body, a protruding portion that is inserted into the liquid injection hole is protruded from a side of the sealing body close to the bottom plate, and the sealing body is welded to a side of the bottom plate away from the surrounding wall.

10. The electronic device as claimed in claim 9, wherein at least two circles of welds surrounding the liquid injection hole are provided on the sealing body in a region where the sealing body overlaps the bottom plate, the two circles of welds are spaced apart in a radial direction of the liquid injection hole, and at least one circle of welds is a continuous weld.

11. The electronic device as claimed in claim 10, wherein the sealing body is provided with two circles of the welding seams, namely an outer circle welding seam and an inner circle welding seam, the inner circle welding seam is formed by welding intermittently along a central ring of the liquid injection hole, and the outer circle welding seam is formed by welding continuously along the central ring of the liquid injection hole.

12. The electronic device according to claim 9, wherein a groove is concavely formed in a side surface of the sealing body away from the convex portion and corresponding to the convex portion, the groove extends into the convex portion, and an explosion-proof notch is formed in the groove.