CN212625795U

CN212625795U - Electronic device

Info

Publication number: CN212625795U
Application number: CN202021647831.5U
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 first casing, the second casing, apron and electric core, first casing includes that bottom plate and annular set up the first leg in bottom plate one side, the second casing includes that roof and annular set up the second leg in roof one side, second leg cover is established outside first leg, set up on the roof and draw forth the hole, the hole is drawn forth in the apron shutoff, positive ear and negative pole ear of electric core one of the two with the apron just is connected to the part of drawing forth the hole, another clamp between positive ear and the negative pole ear is located between first leg and the second leg. The utility model discloses a positive ear of electron device or negative pole ear draw forth the mode simple, and the sealing reliability is high, need not to extrude the casing, and electron device inner space utilization increases.

Description

Electronic device

Technical Field

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

Background

Small lithium ion batteries have been widely used in calculators, electronic watches, and other electronic products because of their advantages of small size, stable discharge voltage, high battery voltage, etc. At present, a common small-sized lithium ion battery generally adopts side extrusion to seal a positive electrode shell and a negative electrode shell, and a positive electrode lug and a negative electrode lug of a winding type battery cell inside the battery are generally led out from the upper end and the lower end of the winding type battery cell to be connected with the positive electrode shell and the negative electrode shell. The existing lithium ion battery has the following defects: 1. the side edges are sealed in a squeezing mode, so that the internal space of the battery in the shell is occupied, and the capacity of the battery is reduced; 2. the outer diameter extrusion type seal has poor sealing reliability due to a large sealing area; 3. the side extrusion type seal has no anti-explosion function, and the safety of the battery can be reduced when the sealing performance is high; 4. the tabs are led out from the upper end and the lower end of the winding type battery core to occupy the space inside the battery.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an aim at: provided is an electronic device having a simplified structure, a high utilization rate of an internal space, a reliable seal, and a high safety.

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

provided is an electronic device including:

the first shell comprises a bottom plate and a first surrounding wall annularly arranged on one side of the bottom plate;

the second shell comprises a top plate and a second surrounding wall annularly arranged on one side of the top plate, the second surrounding wall is sleeved outside the first surrounding wall, the second surrounding wall is fixedly connected with the first surrounding wall, and a leading-out hole is formed in the top plate;

the cover plate is connected to one side surface, far away from the bottom plate, of the top plate in an insulating mode, and the cover plate blocks the leading-out hole;

and one of a positive tab and a negative tab of the battery cell is connected with the part of the cover plate, which is just opposite to the lead-out hole, and the other of the positive tab and the negative tab is clamped between the first enclosure wall and the second enclosure 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, one of the tabs of the battery cell is arranged in the through hole, the tab is connected with a positive plate or a negative plate of the winding battery cell, and the tab penetrates through the lead-out hole and is connected with the cover plate.

As an optimized scheme of the electronic device, the tab comprises a rod body, one end, close to the cover plate, of the rod body is provided with a connecting plate, the positive plate or the negative plate is connected with the outer side wall of the rod body, and the connecting plate is connected with the cover plate.

As a preferable mode of the electronic device, the second wall is welded to the first wall, and an outer side wall of the second wall forms an annular welding ring.

As a preferable scheme of the electronic device, the tab of the battery cell sandwiched between the first surrounding wall and the second surrounding wall is at least partially located in the area covered by the welding ring.

As an optimized scheme of the electronic device, an insulating film is arranged on one side surface of the cover plate close to the top plate, an avoiding hole is formed in the connecting position of the positive lug or the negative lug of the battery cell corresponding to the cover plate, and the insulating film is fixed between the cover plate and the top plate in a hot-pressing mode.

As a preferable mode of the electronic device, the insulating film is any one or a combination of two of a PE layer and a PPa layer; or the like, or, alternatively,

the insulating film includes first glue film and the second glue film that the interval set up, first glue film with be provided with the intermediate level between the second glue film, first glue film and/or the second glue film does the PE layer or PPa layer.

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, a liquid injection hole communicated with the through hole is formed in the bottom plate, and a blocking piece for blocking the liquid injection hole is arranged at the liquid injection hole.

As a preferable scheme of the electronic device, the blocking piece comprises a blocking substrate, an insertion part is convexly arranged on one side surface of the blocking substrate close to the bottom plate, the insertion part is inserted into the liquid injection hole, and the blocking substrate is fixed on one side surface of the bottom plate far away from the first enclosing wall.

As a preferable aspect of the electronic device, the thickness of the second housing is smaller than the thickness of the first housing and the thickness of the cover plate.

The utility model discloses beneficial effect of embodiment: the first shell is fixedly connected with the second shell, and the cover plate is in insulation connection with the top plate of the second shell, so that the electronic device can be effectively sealed without extruding the first shell and the second shell, the space in the shell of the electronic device is not occupied, the internal capacity of the electronic device is effectively improved, and meanwhile, the cover plate is opened in a certain condition by the connection mode, so that the shell of the electronic device has an explosion-proof function, and the safety of the electronic device in the using process is ensured; through with either anodal or negative pole two clamp locate between first leg and the second leg, both simplified the mode of drawing forth of anodal or negative pole, also guaranteed the good contact of anodal or negative pole and casing to need not to occupy the space of the inside upper and lower both sides of electron device, promoted the interior empty utilization ratio of electron device.

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 view of a first housing according to an embodiment of the present invention.

Fig. 3 is a schematic view of a second housing according to an embodiment of the present invention.

Fig. 4 is a schematic view of a block piece according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of the positive tab according to the embodiment of the present invention.

Fig. 6 is an assembly diagram of the positive tab and the winding type battery cell according to the embodiment of the present invention.

Fig. 7 is an assembly diagram of the positive tab and the winding-type electric core and the first housing according to the embodiment of the present invention.

In the figure: 1. a first housing; 11. a base plate; 111. a liquid injection hole; 12. a first enclosure wall; 2. a second housing; 21. a top plate; 211. an exit aperture; 22. a second enclosure wall; 3. an insulating layer; 4. a cover plate; 5. a winding type battery cell; 51. a negative plate; 511. a negative tab; 52. a diaphragm; 53. a positive plate; 54. a through hole; 55. a positive tab; 551. a rod body; 552. a connecting plate; 6. welding a ring; 7. an insulating film; 8. a blocking member; 81. plugging the substrate; 82. a plug-in part.

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 7, the electronic device of the embodiment of the present invention includes a first case 1, a second case 2, a cover plate 4 and a battery cell, the first casing 1 comprises a base plate 11 and a first surrounding wall 12 annularly arranged on one side of the base plate 11, the second housing 2 includes a top plate 21 and a second surrounding wall 22 annularly provided on one side of the top plate 21, the second surrounding wall 22 is sleeved outside the first surrounding wall 12, the second surrounding wall 22 is fixedly connected with the first surrounding wall 12, the top plate 21 is provided with a leading-out hole 211, the cover plate 4 is connected to one side surface of the top plate 21 far away from the bottom plate 11 in an insulating way, the cover plate 4 blocks the lead-out hole 211, one of the positive tab 55 and the negative tab 511 of the battery cell is connected with the part of the cover plate 4 facing the lead-out hole 211, the other of the positive tab 55 and the negative tab 511 is sandwiched between the first enclosure wall 12 and the second enclosure wall 22. Through with first casing 1 and second casing 2 fixed connection, and with the roof 21 insulated connection of apron 4 and second casing 2, need not to extrude first casing 1 and second casing 2 and also can carry out effectual sealed to electronic device, do not occupy the inside space of electronic device's casing, electronic device's internal capacity has been promoted effectively, simultaneously through locating between first leg 12 and second leg 22 with one clamp in positive pole ear 55 or negative pole ear 511 both, need not to occupy the space of the inside upper and lower both sides of electronic device, guaranteed the good contact of electrode with the casing promptly, also improved the inside space of utilizing of electronic device.

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.

The battery cell may be a winding battery cell 5 or a laminated battery cell, and the winding battery cell 5 is taken as an example below.

The winding type battery cell 5 comprises a positive plate 53 and a negative plate 51, a diaphragm 52 is arranged between the positive plate 53 and the negative plate 51, the positive plate 53, the diaphragm 52 and the negative plate 51 are wound to form the winding type battery cell 5, a negative tab 511 is led out from the negative plate 51 of the winding type battery cell 5, and the negative tab 511 is clamped between the first enclosing wall 12 and the second enclosing wall 22 after being bent.

Optionally, the inner side of the top plate 21 is provided with an insulating layer 3. By providing the insulating layer 3, the winding-type battery cell 5 and the top plate 21 of the second casing 2 can be insulated and isolated, and the use safety of the electronic device is improved. In other embodiments, without providing the additional insulating layer 3, one end of the separator 52 of the wound battery cell 5 close to the top plate 21 may be extended toward the outside of the wound battery cell 5 to form a partition, and the partition forms an insulating structure between the wound battery cell 5 and the top plate 21.

In this embodiment, a through hole 54 is formed in the middle of the winding type battery cell 5, a positive tab 55 of the battery cell is disposed in the through hole 54, the positive tab 55 is connected to the positive plate 53 of the winding type battery cell 5, and the positive tab 55 passes through the lead-out hole 211 and is connected to the cover plate 4. The through hole 54 is directly arranged in the winding type battery cell 5, the cover plate 4 and the positive plate 53 are connected through the positive lug 55 to achieve leading-out of current, the design can avoid the situation that the lug is led out from the upper end of the winding type battery cell 5 to occupy the space of the upper end, and meanwhile, the arrangement of the positive lug 55 can also reduce the connection difficulty with the cover plate 4.

Of course, the positions of the positive tab 55 and the negative tab 511 can also be interchanged, that is, the negative tab 511 is disposed in the through hole 54 and connected with the cover plate 4, and the positive tab 55 is sandwiched between the first surrounding wall 12 and the second surrounding wall 22. In the following description, positive tab 55 is connected to lid 4, and negative tab 511 is interposed between first wall 12 and second wall 22.

Specifically, the positive tab 55 is welded to the positive tab 53, the positive tab 55 is welded to the cover plate 4, the negative tab 51 is connected to the negative tab 511, and the negative tab 511 is bent and then clamped between the first enclosure wall 12 and the second enclosure wall 22.

Negative tab 511 may be an uncoated current collector (copper foil) or may be a metal conductor additionally soldered to an uncoated current collector.

In other embodiments, as shown in fig. 1 and 5, the positive tab 55 includes a rod 551, a connecting plate 552 is disposed at one end of the rod 551 close to the cover plate 4, the positive tab 53 or the negative tab 51 is connected to an outer side wall of the rod 551, and the connecting plate 552 is connected to the cover plate 4.

Preferably, the cross-sectional size of the connecting plate 552 is larger than that of the rod 551, the connecting area between the positive tab 55 and the cover plate 4 can be increased by arranging the connecting plate 552 with a larger cross-sectional size on the rod 551, and the cross-sectional size of the rod 551 is smaller, so that the connecting reliability is ensured, the space inside the electronic device is not excessively occupied, and the utilization rate of the space inside the electronic device is improved.

In an embodiment, the second surrounding wall 22 is welded to the first surrounding wall 12, the outer side wall of the second surrounding wall 22 forms an annular welding ring 6, and at least part of the negative tab 511 of the wound battery cell 5 is located in an area covered by the welding ring 6. By locating the negative tab 511 in the area covered by the weld bead 6, it is ensured that the negative tab 511 is welded between the two surrounding walls, thereby further ensuring that the negative tab 511 is not misaligned.

Specifically, at least two circles of the welding rings 6 are arranged on the second surrounding wall 22 at intervals along the axial direction of the second surrounding wall 22, so as to enhance the sealing performance of the electronic device and ensure good contact between the electrodes and the first surrounding wall 12 and the second surrounding wall 22.

In an embodiment, an insulating film 7 is disposed on one side surface of the cover plate 4 close to the top plate 21, an avoiding hole is disposed at a connection position of the insulating film 7 corresponding to the positive tab 55 of the winding-type battery cell 5, and the insulating film 7 is fixed between the cover plate 4 and the top plate 21 by hot pressing.

The insulating film 7 is fixed between the lid plate 4 and the top plate 21 by hot pressing. The hot pressing mode can not only reduce the manufacturing difficulty, but also improve the insulating connection strength between the cover plate 4 and the top plate 21, and effectively prevent the separation of the cover plate 4 and the top plate 21. Because the cover plate 4 has certain strength, when the temperature and the pressure rise, under the condition that the sealing strength generated by the heat seal between the cover plate 4 and the second shell 2 is certain, the cover plate 4 can be opened by the expansion of the air in the electronic device, so that the shell of the electronic device can be opened, the explosion-proof function is realized, and the safety of the electronic device in the using process is ensured.

Specifically, the insulating film 7 is one of or a combination of two of a PE layer and a PPa layer.

In other embodiments, the insulating film 7 may also be a composite layer structure, that is, the insulating film 7 includes a first adhesive layer and a second adhesive layer arranged at intervals, an intermediate layer is arranged between the first adhesive layer and the second adhesive layer, and the first adhesive layer and/or the second adhesive layer is the PE layer or the PPa layer.

The middle layer is made of plastic which has higher temperature resistance and better electrical insulating property than PE or PPa, such as a PFA layer, a PEN layer, a PET layer, a PPS layer and the like.

Polyethylene (PE) is a thermoplastic resin obtained by polymerizing ethylene. In industry, copolymers of ethylene with small amounts of alpha-olefins are also included. The polyethylene is odorless, nontoxic, has wax-like hand feeling, excellent low-temperature resistance and good chemical stability, and can resist corrosion of most of acid and alkali. Is insoluble in common solvents at room temperature, has low water absorption and excellent electrical insulation.

Polypropylene (PP) is a polymer formed by propylene addition polymerization, is a white waxy material, is transparent and light in appearance and flammable, has a melting point of 165 ℃, is softened at about 155 ℃, and has a use temperature range of-30-140 ℃. The modified PP (ppa) is obtained by modifying PP, and for example, the modified PP (ppa) used in this embodiment is a Metal-philic modified Polypropylene resin (hereinafter, referred to as Metal-philic modified PP) whose surface has Metal-philic property by a chemical modification method such as copolymerization, grafting or crosslinking, so that it can be fused with a Metal surface by heating to form a good bonding seal.

PFA is known as tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer (also known as perfluoroalkoxy, soluble polytetrafluoroethylene), which is a copolymer of a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene. The melt cohesiveness is enhanced, the melt viscosity is reduced, and the performance is unchanged compared with the polytetrafluoroethylene. The resin can be directly processed into products by adopting a common thermoplastic molding method. PFA has excellent chemical corrosion resistance at a long-term use temperature of-200 ℃ to-260 ℃, resists corrosion to all chemicals, has the lowest friction coefficient in plastics, has good electrical property, has no temperature influence on electrical insulation, and is called as 'plastics king'. The PFA has chemical resistance similar to that of polytetrafluoroethylene, better than vinylidene fluoride, better creep resistance and compression strength than that of polytetrafluoroethylene, high tensile strength and elongation of up to 100-; the dielectric property is good, and the radiation resistance is excellent; the flame retardance is high; has no toxicity or harm, has physiological inertia, and can be implanted into human body.

Preferably, the insulating layer 3 is made of the same material as the insulating film 7, and the insulating layer 3 is fixed on one side of the top plate 21 close to the winding type battery cell 5 by hot pressing. Through on the roof 21 with insulating layer 3 hot pressing second casing 2, can reduce the operation degree of difficulty, promote insulating effect.

Of course, in other embodiments, the material of the insulating layer 3 may also be set to be other materials, and the insulating layer 3 may be fixed on one side of the top plate 21 close to the winding type battery cell 5 by an adhesive.

In one embodiment, a through hole 54 is formed in the middle of the wound battery cell 5, a liquid injection hole 111 communicated with the through hole 54 is formed in the bottom plate 11, and a blocking piece 8 for blocking the liquid injection hole 111 is arranged at the liquid injection hole 111. Through set up the through-hole 54 that runs through in the middle part of coiling formula electricity core 5, and set up notes liquid hole 111 on bottom plate 11 and the position just right with through-hole 54, need not to set up in addition between casing and coiling formula electricity core 5 and dodge the passageway, reduce the inner space that occupies the electronic device, also reduced the preparation degree of difficulty of electronic device.

Further, the blocking piece 8 includes a blocking substrate 81, a plug-in portion 82 is convexly disposed on a side of the blocking substrate 81 close to the bottom plate 11, the plug-in portion 82 is plugged into the liquid injection hole 111, and the blocking substrate 81 is fixed on a side of the bottom plate 11 away from the first surrounding wall 12.

Specifically, the plugging substrate 81 is welded to the bottom plate 11.

The sealing substrate 81 and the bottom plate 11 may be welded by ultrasonic welding, resistance welding, or the like, without being limited to laser welding, and the sealing substrate 81 may be welded from the outside of the case, thereby reducing the difficulty of operation.

In one embodiment, the thickness of the second housing 2 is smaller than the thickness of the first housing 1 and the thickness of the cover plate 4. By setting the thickness of the second case 2 to be smaller than the thickness of the first case 1 and the thickness of the cover plate 4, the second case 2 can be preferentially deformed to release pressure when pressure is applied to the inside of the electronic device.

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

step S100, assembling the cover plate 4 and the second shell 2 into an upper cover group through hot pressing of the insulating film 7;

step S200, welding one end of the positive plate 53 with the outer side wall of the rod body 551 of the positive tab 55, and then winding the positive plate 53, the diaphragm 52 and the negative plate 51 to form the winding type battery cell 5, wherein the rod body 551 is located at the center of the winding type battery cell 5;

step S300, welding the positive lug 55 and the upper cover group into a component;

step S400, assembling the winding type battery cell 5 with the positive electrode tab 55 in the first shell 1, and enabling the negative electrode tab 511 of the winding type battery cell 5 to be folded and attached to the outer side of the first shell 1; then the upper cover group is assembled by pressing downwards, and the negative electrode tab 511 is positioned between the first surrounding wall 12 and the second surrounding wall 22 of the second shell 2;

step S500, welding the second surrounding wall 22 of the second shell 2 with the first surrounding wall 12;

step S600, injecting liquid from the liquid injection hole 111, forming, then plugging the liquid injection hole 111 through the plugging piece 8, and finally welding the plugging piece 8 on the bottom plate 11 of the first shell 1 to realize fixing.

In other embodiments, the wound-type battery cell 5 with the positive tab 55 may be assembled to the first casing 1, and then the positive tab 55 may be welded to the upper cover assembly.

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, comprising:

2. The electronic device according to claim 1, wherein the electric core is a winding type electric core, a through hole is formed in a middle portion of the winding type electric core, one of tabs of the electric core is disposed in the through hole, the tab is connected with a positive plate or a negative plate of the winding type electric core, and the tab passes through the lead-out hole and is connected with the cover plate.

3. The electronic device according to claim 2, wherein the tab comprises a rod body, a connecting plate is disposed at one end of the rod body close to the cover plate, the positive plate or the negative plate is connected to an outer side wall of the rod body, and the connecting plate is connected to the cover plate.

4. An electronic device according to claim 1, wherein the second wall is welded to the first wall, and the outer wall of the second wall forms an annular welding ring.

5. The electronic device of claim 4, wherein the tab of the cell sandwiched between the first and second casing walls is at least partially located in a region covered by the welding ring.

6. The electronic device according to claim 1, wherein an insulating film is disposed on a side surface of the cover plate close to the top plate, an avoiding hole is disposed at a connection position of the positive tab or the negative tab of the battery cell connected to the cover plate, and the insulating film is fixed between the cover plate and the top plate by hot pressing.

7. The electronic device according to claim 6, wherein the insulating film is any one of a PE layer and a PPa layer or a combination of both; or the like, or, alternatively,

8. The electronic device according to claim 1, wherein the electric core is a coiled electric core, a through hole is formed in the middle of the coiled electric core, a liquid injection hole is formed in the bottom plate and is communicated with the through hole, and a blocking piece for blocking the liquid injection hole is arranged at the liquid injection hole.

9. The electronic device according to claim 8, wherein the blocking member comprises a blocking substrate, a side of the blocking substrate close to the bottom plate is provided with a protruding insertion portion, the insertion portion is inserted into the liquid filling hole, and the blocking substrate is fixed to a side of the bottom plate away from the first enclosing wall.

10. The electronic device according to claim 1, wherein a thickness of the second housing is smaller than a thickness of the first housing and a thickness of the cover plate.