CN209981285U - Needle type lithium ion battery - Google Patents
Needle type lithium ion battery Download PDFInfo
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- CN209981285U CN209981285U CN201921137825.2U CN201921137825U CN209981285U CN 209981285 U CN209981285 U CN 209981285U CN 201921137825 U CN201921137825 U CN 201921137825U CN 209981285 U CN209981285 U CN 209981285U
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- lithium ion
- ion battery
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- shell
- type lithium
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 94
- 229910052751 metal Inorganic materials 0.000 claims abstract description 55
- 239000002184 metal Substances 0.000 claims abstract description 55
- 238000003466 welding Methods 0.000 claims abstract description 26
- 238000004804 winding Methods 0.000 claims abstract description 17
- 230000002093 peripheral effect Effects 0.000 claims description 57
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 239000003792 electrolyte Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 abstract description 10
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 238000003780 insertion Methods 0.000 description 5
- 230000037431 insertion Effects 0.000 description 5
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- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 230000017525 heat dissipation Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
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- 235000015110 jellies Nutrition 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Images
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model discloses a needle type lithium ion battery, which comprises a cap, a shell and a bottom cover; the bottom cover is welded with one end of the shell; the cap comprises a stem, an annular part surrounding the periphery of the stem and a metal cover plate surrounding the periphery of the annular part, and the metal cover plate is welded with the other end of the shell; the core column is connected with one pole of a winding core, the core column is configured to be used as one electrode of a needle type lithium ion battery, the bottom cover is connected with the other pole of the winding core, and the bottom cover, the shell and the metal cover plate are configured to be used as the other electrode of the needle type lithium ion battery; the outer diameter of the shell is less than or equal to 8 mm. The utility model discloses a cap and bottom adopt the welding mode to be connected with the casing respectively, are connected with the riveting mode among the prior art and compare, the utility model discloses a needle type lithium ion battery sealing reliability is higher, and energy density is higher, can last the miniaturization to the battery moreover.
Description
Technical Field
The utility model relates to a battery technology field, more specifically relates to a pin type lithium ion battery.
Background
With the mature application of AI technology and the internet entering the internet stage of everything, the development of miniaturized electronic products is in the golden age, and wearable products such as watches and motion monitors come into being; auxiliary medical products such as hearing aids, disease-specific monitors; an internet sound control entrance such as a Bluetooth headset and a micro online translator; the development of intelligent household products such as intelligent keys and internet of things sensors such as independent miniature optical, electric, acoustic, thermal and electromagnetic wave sensors will enter an exponential growth stage, and the demand of miniature rechargeable lithium ion batteries for energy power systems matched with the sensors will increase day by day.
The rechargeable needle type lithium ion battery is defined as a lithium ion battery which has a cylindrical shape with the outer diameter R3-8 mm and the height H10-70 mm and can be repeatedly charged for multiple use.
Due to the limitation of manufacturing technology, the cover plate and the shell of the rechargeable needle type lithium ion battery on the market at present are connected in a riveting mode, so that the space in the diameter direction and the height direction is sacrificed, the internal space of the battery is reduced, the capacity of the battery is not promoted, the volumetric specific energy is reduced, and the potential safety hazards exist, wherein the defects that the pressure of an opening valve of an explosion-proof valve is too high or the explosion-proof valve does not exist, the reliability is poor, and the service life is short exist.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a new technical scheme of pin type lithium ion battery.
According to an aspect of the present invention, there is provided a needle type lithium ion battery comprising a cap, a case and a bottom cover; the bottom cover is welded with one end of the shell;
the cap comprises a stem, an annular part surrounding the periphery of the stem and a metal cover plate surrounding the periphery of the annular part, and the metal cover plate is welded with the other end of the shell;
the core column is connected with one pole of a winding core, the core column is configured to be used as one electrode of a needle type lithium ion battery, the bottom cover is connected with the other pole of the winding core, and the bottom cover, the shell and the metal cover plate are configured to be used as the other electrode of the needle type lithium ion battery;
the outer diameter of the shell is less than or equal to 8 mm.
Optionally, the metal cover plate is provided with an electrolyte injection hole, and the electrolyte injection hole is configured to inject electrolyte into the needle-type lithium ion battery; the metal cover plate further comprises a pole column, and the pole column is configured to be used for plugging the liquid injection hole.
Optionally, the pole protrudes out of the upper surface of the metal cover plate and is connected with the winding core; the pole is configured to be connected with an external device as an electrode of the lithium ion battery.
Optionally, the stem is configured to protrude from the upper surface of the glass layer, and the stem is connected with an external device as an electrode of the lithium ion battery.
Optionally, a thinning area is arranged on the side wall of the shell, and the thinning area is provided with notches.
Optionally, an insulating pad is disposed on an upper surface of the metal cover plate.
Optionally, an insulating support member is disposed between the metal cover plate and the winding core, and the insulating support member is disposed inside the open end of the shell and forms a hollow structure.
Optionally, the metal cover plate comprises a cover plate peripheral component, and an outer side wall of the cover plate peripheral component is buckled outside the opening end of the shell.
Optionally, the cover plate peripheral assembly is connected with the open end of the shell in a matching manner and then is connected in a sealing manner by welding.
Optionally, the open end of the housing includes a guiding section and a matching section connected to each other, an outer diameter of the guiding section is smaller than an inner diameter of the outer sidewall, an outer diameter of the matching section is larger than the inner diameter of the outer sidewall, and the outer sidewall of the cover plate peripheral component is fastened outside the guiding section and the matching section.
The utility model has the advantages that: the utility model discloses a cap and bottom adopt the welding mode to be connected with the casing respectively, are connected with the apron among the prior art and casing riveting mode and compare, the utility model discloses a connected mode is more firm, and pin type lithium ion battery's leakproofness reinforcing simultaneously, and the battery inner space can obtain reasonable utilization, is favorable to improving the energy density of battery.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of the needle type lithium ion battery of the present invention.
Fig. 2 is a schematic structural diagram of a needle-type lithium ion battery according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a third needle-type lithium ion battery according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a fourth needle-type lithium ion battery according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a cap according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a fifth needle-type lithium ion battery according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a sixth needle-type lithium ion battery according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
According to an embodiment of the present invention, a needle-type lithium ion battery is provided, as shown in fig. 1, including a cap, a housing 14, a bottom cover 143, a ring 12, and a stem 11.
The cap, the housing 14 and the bottom cover 143 are formed by separate welding, specifically, the housing 14 is a hollow cylindrical structure, the bottom cover 143 is connected with one end of the housing 14 by welding, and the cap is connected with the other end of the housing 14 by welding.
The shell 14 and the bottom cover 143 are sealed by welding, and the shell 14 is made of high-strength stainless steel with the wall thickness smaller than 0.2 mm, so that pinholes and cracks which are easy to occur when the ultrathin high-strength metal material is integrally stretched are avoided, and the reliability of the battery is improved.
The cap comprises a stem 11, an annular part 12 surrounding the stem 11, and a metal cover plate 13 surrounding the annular part 12, wherein the metal cover plate 13 and a shell 14 are sealed in a welding mode. The annular portion 12 is made of glass.
The upper surface of the annular part 12 and the upper surface of the metal cover plate 13 are provided with a first insulating pad 130 to prevent external short circuit between the positive electrode and the negative electrode, that is, to prevent the stem 11 from short circuit with the metal cover plate 13 and the housing 14 when the lithium-ion battery is connected with an external device.
The utility model discloses a pin type lithium ion battery's external diameter is less than or equal to 8mm, and pin type lithium ion battery of this application can be applied to among the microminiature electronic product, for example intelligent wrist strap, intelligent wrist-watch, microminiature sound generating mechanism etc..
For example, as shown in fig. 1, the metal cover 13 includes a cover peripheral member 131, and the cover peripheral member 131 has a flat plate shape.
The annular portion 12 has an annular inner surface and an annular outer surface, the annular outer surface is in sealing connection with the inner side wall of the cover plate peripheral component 131, and the annular portion inner surface is in sealing connection with the stem 11.
Optionally, the annular portion 12 has a protruding portion B, and the protruding portion B covers the lower end surface of the cover plate peripheral component 131, in this example, the structural design of the special shape of the annular portion 12 can prevent the positive tab 15 from directly contacting the metal cover plate 13 (i.e. the negative electrode of the needle-type lithium ion battery) during the use of the needle-type lithium ion battery, so as to avoid a short circuit phenomenon inside the needle-type lithium ion battery.
Optionally, an insulating support 20 is disposed between the metal cover plate 13 and the winding core, and the insulating support 20 is disposed at the open end of the shell 14 and forms a hollow structure. When welding the tab, the tab is located in the hollow portion of the insulating support 20. In one aspect, the insulating support 20 is configured to prevent the jelly roll from moving in the axial direction of the needle-type lithium ions. Specifically, the upper end face of the insulating support member 20 is in contact with the lower end face of the metal cover plate 13, and the lower end face of the insulating support member 20 is in contact with the winding core; in a test, for example, in a drop test of a pin lithium ion battery, the insulating support member 20 can prevent the movement of the winding core, and ensure the stability of the internal structure of the pin lithium ion battery. On the other hand, the insulating support 20 can prevent the short circuit phenomenon from occurring inside the pin lithium ion battery; specifically, during the assembly process or the test process of the pin-type lithium ion battery (for example, a drop test of the battery), the insulating support 20 can prevent the positive tab 15 that is not covered by the insulating layer from contacting the inner side wall of the housing 14, thereby avoiding the internal short circuit phenomenon of the pin-type lithium ion battery.
Optionally, a connecting piece 21 is arranged inside the needle type lithium ion battery, specifically, the connecting piece 21 is arranged below the positive tab 15, and the connecting piece 21 is connected with the stem 11 in a welding manner; for example, laser welding or ultrasonic welding may be adopted to puncture the connecting piece 21 and the positive tab 15, so that the connecting piece 21 is welded to the stem 11, thereby serving to fix the positive tab 15; the inventor finds that in the prior art, the positive tab 15 is usually directly connected with the stem 11, but the material of the positive tab 15 is usually aluminum, the material of the stem 11 is usually stainless steel, when different materials are welded together, brittle alloy is easily formed at the welding position, and the welding point is not firm, so when the connecting piece 21 is welded with the stem 11, the connecting piece 11 is made of the same material as the stem 11, the positive tab 15 can be better fixed, and the welding is firm.
According to an embodiment of the present invention, as shown in fig. 2, a first insulating pad 130 is disposed on the upper surface of the metal cover plate 13, and the material of the first insulating pad 130 may be plastic, rubber, or the like; specifically, when the stem 11 protrudes from the upper surface of the first insulating pad 130, and the stem 11 is configured to serve as one electrode of the lithium ion battery, the housing 14, the metal cover 13, and the bottom cover 143 can serve as the other electrode of the lithium ion battery; for example, when the stem 11 is connected with an external device as the positive electrode of the needle-type lithium ion battery, in order to prevent the short circuit phenomenon and the like caused by the direct contact between the metal cover plate 13 and the external device, the first insulating pad 130 is disposed on the upper surface of the metal cover plate 13, so that the housing 14 or the bottom cover 143 is used as the negative electrode of the needle-type lithium ion battery, and the occurrence of the external short circuit is avoided.
Optionally, as shown in fig. 2, a second insulating pad 132 is disposed on the lower end surface of the cap, the second insulating pad 132 is an annular insulating pad, and the second insulating pad 132 is configured to prevent the positive tab 15 from directly contacting with the cap, so as to avoid an internal short circuit occurring when the pin lithium ion battery is internally assembled, in use, or in a test process, when the pin lithium ion battery is in contact with the cover plate 13.
Optionally, the stem 11 has an inverted T-shaped structure, and an area of a lower end surface of the stem 11 is larger than an area of an upper end surface of the stem 11; the lower terminal surface of stem 11 is used for being connected with anodal ear 15, and the stem 11 of type of falling T structure for the area of being connected with anodal ear 15 is great, makes things convenient for anodal ear's connection and fixed.
According to an embodiment of the present invention, as shown in fig. 3, the metal cover plate 13 includes a cover plate peripheral component 131, and the cover plate peripheral component 131 is a U-shaped structure. For example, the cover plate peripheral member 131 has a U-shaped cross section.
The open end of the housing 14 is in a shape of an upper end closed, the open end of the housing 14 includes a guiding section 141 and a matching section 142 which are connected with each other, and the outer side wall of the cover plate peripheral component 131 is connected with the open end of the housing in a buckling manner.
The buckling connection adopts a push buckle, wherein the shell 14 is a fixed side, the cap is a movable side, and the cover plate peripheral component 131 is pushed into the shell 14 through external force.
Specifically, the open end of the housing 14 is snap-fit connected to the outer sidewall of the cover plate peripheral component 131 for welding after the parts are assembled. The open end of the housing 14 includes a guide section 141 and a fitting section 142, an outer diameter d2 of the guide section 141 is smaller than an inner diameter d1 of the outer sidewall of the deck peripheral assembly 131, and an outer diameter of the fitting section 142 is larger than the inner diameter of the outer sidewall of the deck peripheral assembly 131.
When the cover peripheral component 131 is in fit connection with the housing 14, an outer side wall of the cover peripheral component 131 is buckled outside the guide section and the fitting section, and specifically, the cover peripheral component 131 is buckled with the housing 14 along the guide section 142 and the fitting section 142 in sequence.
Since the outer diameter of the fitting section 142 is larger than the inner diameter of the outer sidewall of the cover plate peripheral component 131, the fitting manner of the housing 14 and the cover plate peripheral component 131 is equivalent to the interference fit in the fitting manner of a hole and a shaft, wherein the design of the open end of the housing 14 provides the precise fit of the cover plate and the housing, the good sealing effect, and the welding reliability is improved.
The metal cover plate 13 and the housing 14 are made of metal, in this example, the metal cover plate 13 and the housing 14 are matched in a buckling manner and then are hermetically connected in a welding manner, after the metal cover plate 13 and the housing 14 are fixed in a buckling manner, when welding is performed again, mutual transverse dislocation between the outer side wall of the cover plate peripheral component 131 and the housing 14 cannot occur, and meanwhile, the metal and the metal are connected together after being melted, so that the metal and the metal can be more effectively and reliably sealed, water vapor can be prevented from entering, and the reliability of the battery can be improved.
Preferably, the cover plate peripheral component 131 has a height in the range of 0-5 mm.
According to an embodiment of the present invention, there is provided a needle type lithium ion battery, as shown in fig. 4, a core column 11 of the needle type lithium ion battery is connected to one electrode of a winding core, and the core column 11 is configured to serve as one electrode of the needle type lithium ion battery; specifically, the stem 11 is connected to the winding core through the positive tab 15, the stem 11 is configured to protrude from the upper surface of the first insulating pad 130, and the stem 11 can be connected to an external device as a positive electrode of a lithium ion battery.
In the prior art, when the needle type lithium ion battery is connected with external equipment through a connecting wire, because the structure of the needle type lithium ion battery is very small, the connection part is not easy to connect and fix, and accident potential hazards such as electric leakage, short circuit and the like are easy to occur; in order to solve this technical problem, the inventors have found that when the stem 11 protrudes from the upper surface of the first insulating pad 130 and the stem 11 is used as an electrode of a lithium ion battery and is connected to an external device by plugging or welding, the lithium ion battery can be stably connected to the external device, and the connection method is simplified.
In one example, the surface of the annular portion 12 in contact with the electrolyte is provided with a component resistant to corrosion by hydrofluoric acid, in particular, the lower end face of the annular portion 12 is provided with a component resistant to corrosion by hydrofluoric acid, the component including a coating resistant to corrosion by hydrofluoric acid and/or a component resistant to corrosion by hydrofluoric acid, enabling the annular portion 12 to be reliably used in a needle-type lithium ion battery electrolyte environment for a long period of time.
In one example, as shown in fig. 5, the ring portion includes an upper layer 121 and a lower layer 122, and the lower layer 122 is a member resistant to corrosion by hydrofluoric acid.
The component resisting corrosion of hydrofluoric acid comprises any one of corrosion-resistant glass, corrosion-resistant ceramic and a corrosion-resistant coating.
The upper layer 121 is made of a common inorganic non-metallic material, and the common inorganic non-metallic material includes common glass and common ceramic.
According to the utility model discloses an embodiment provides a needle type lithium ion battery, as shown in fig. 6, positive ear 15 and negative pole ear are drawn forth to needle type lithium ion battery's book core, positive ear is connected with stem 11, the negative pole ear is connected with bottom 143.
The metal cover plate 13 is provided with an electrolyte injection hole which is configured to inject electrolyte into the needle type lithium ion battery; the metal cover plate 13 further comprises a pole column 09, and the pole column 09 is configured to be used for plugging the liquid injection hole after liquid injection is finished.
The electrode post 09 protrudes from the upper surface of the metal cover plate 13, and the electrode post 09 is configured to be connected with an external device as one electrode of a needle-type lithium ion battery.
In this example, the stem 11 of the needle-type lithium ion battery serves as a positive electrode, the post 09 of the needle-type lithium ion battery serves as a negative electrode, the stem 11 and the post 09 are located on the same side of the needle-type lithium ion battery, the stem 11 and the post 09 are asymmetrically distributed, specifically, as shown in fig. 6 to 7, the stem 11 is disposed at the geometric center of the cap, the stem 11 is circumferentially provided with an annular portion 12, and the annular portion 12 is circumferentially provided with a metal cover 13. The pole 09 is located on the metal cover plate 13. A first insulating pad 130 is disposed on the upper surface of the metal cap plate 13.
In this example, the stem 11 and the terminal 09 are located on the same side of the lithium ion battery. This kind of setting mode convenience of customers assembles because utmost point post 09 is the same polarity with casing and bottom, for example the negative pole. The user can select the core column 11 and the pole column 09 on the same side to be respectively used as two poles of the needle type lithium ion battery to be connected with an external circuit, and can also select the core column 11 and the bottom cover to be respectively used as two poles of the needle type lithium ion battery to be connected with the external circuit. In the prior art, the positive and negative electrodes of a battery are respectively positioned at two ends of a lithium ion battery, and a user can only connect the two ends of the battery as two electrodes with an external circuit; the inventor of the utility model finds, through the technical scheme of the utility model, the external circuit design can be simplified greatly, can reduce the volume of electronic equipment or product simultaneously.
According to an embodiment of the present invention, there is provided a needle type lithium ion battery, as shown in fig. 7, a core column 11 of the needle type lithium ion battery is connected to one pole of a winding core, and the core column 11 is configured to be connected to an external device as an electrode of the needle type lithium ion battery; specifically, the stem 11 is connected to the winding core through the positive tab 15, the stem 11 is configured to protrude from the upper surface of the first insulating pad 130, and the stem 11 is connected to an external device as a positive electrode of the lithium ion battery.
The pin type lithium ion battery comprises an electrode post 09, the electrode post 09 is arranged on the metal cover plate 13, and the electrode post 09 is configured to be used as an electrode of the pin type lithium ion battery to be connected with external equipment; wherein the pole is configured to be connected with an external device as a negative electrode of the lithium ion battery.
In this example, the stem 11 of the needle-type lithium ion battery is used as a positive electrode, the post 09 of the needle-type lithium ion battery is used as a negative electrode, the stem 11 and the post are located on the same side of the needle-type lithium ion battery, the stem 11 and the post 09 are symmetrically distributed, specifically, the stem 11 is not disposed at the geometric center of the cap, the stem 11 is disposed at a position deviated from the central axis of the needle-type lithium ion battery, and the post 09 and the stem 11 are symmetric about the central axis of the needle-type lithium ion battery.
Optionally, the metal cover plate 13 is provided with a liquid injection hole. After the liquid injection is finished, the liquid injection hole is blocked by the pole column 09. For example, the electrode column 09 is welded in the liquid injection hole.
Optionally, a thinned area is provided on the side wall of the housing 14, and the thickness of the housing in the thinned area is smaller than that in the non-thinned area; the thinning area is provided with a notch; in this example, when the internal gas pressure of the lithium ion battery reaches a set value, the notch of the thinned region is cracked to generate cracks or gaps under the action of the internal gas pressure, and the cracks or gaps can form gas leakage channels, so that the internal gas can be released.
According to an embodiment of the present invention, the metal cover plate 13 includes a cover plate peripheral component 131, and the cover plate peripheral component 131 is a U-shaped structure. The cover plate peripheral assembly 131 is fixedly connected to the housing 14 through a guide member. The guide member is provided as the buffer portion 18 in this embodiment.
As shown in fig. 4, the buffer portion 18 is disposed between the inner side wall and the outer side wall of the cover plate peripheral component 131 and protrudes from the open end of the cover plate peripheral component 131, a guide angle is disposed at the outer edge of the protruding portion of the buffer portion 18, the housing 14 is sleeved outside the protruding portion via the guide angle, and the housing 14 is opposite to the outer side wall of the cover plate peripheral component 131.
According to an embodiment of the present invention, as shown in fig. 4, the cover plate peripheral component 131 is a U-shaped structure, the buffer portion 18 is disposed between the inner side wall and the outer side wall of the cover plate peripheral component 131 and protrudes from the opening end of the cover plate peripheral component 131, and the outer edge of the protruding portion of the buffer portion 18 is provided with a guide angle. The guide angle is provided with chamfers at both sides of the lower end surface of the convex portion of the cushioning portion 18.
A guide corner of the housing 14 along an outer edge of the protruding portion of the buffer portion 18 from bottom to top is opposite to an outer sidewall of the cover peripheral component 131, wherein a connection position of the housing 14 and the cover peripheral component 131 is disposed above an upper vertex angle a of the guide corner.
In this example, the buffer part 18 does not occupy the internal space of the pin-type lithium ion battery, no plastic part is used between the metal cover plate 13 and the housing 14, and the battery roll can be placed by removing the wall thickness of the cover plate and the housing in the height direction, so that the utilization rate of the internal space of the battery in the height direction can be improved, and the volumetric specific energy of the battery can be improved.
The riveting connection mode of apron and casing adopts the working of plastics among the prior art, the working of plastics is equivalent to the packing ring setting between apron and casing, the working of plastics causes the sacrifice of diameter and direction of height upper space, and the battery inner space reduces, is unfavorable for the promotion of battery capacity, and volumetric specific energy descends.
When the shell 14 and the cover plate peripheral component 131 are welded after the parts are matched through the buffer part 18, in the welding process, due to the guiding effect and the fixing effect of the buffer part 18, mutual transverse dislocation between the outer side wall of the cover plate peripheral component 131 and the shell 14 cannot occur, and the sealing performance of the shell 14 and the metal cover plate 13 is improved. For example, the buffering portion 18 is a plastic member in this embodiment.
The cover plate peripheral assembly adopts a U-shaped structure, the distance between a welding position and an insulating sealing position is increased, meanwhile, the inner space of the needle type battery is small, when the cover plate peripheral assembly 131 and the shell 14 are indirectly welded together through the buffer part, a large amount of heat is generated, and the heat dissipation space inside the battery is enlarged by the cover plate peripheral assembly 131 of the U-shaped structure, so that the quick heat dissipation effect is achieved. Wherein the insulating and sealing member is an annular portion 12.
According to an embodiment of the present invention, the metal cover plate 13 includes a cover plate peripheral component 131, the cover plate peripheral component 131 is a U-shaped structure, and the cover plate peripheral component 131 is fixedly connected to the housing 14 through a guiding member. The guide part in this embodiment is an insertion structure for connecting the cover plate peripheral component with the housing.
In one example, as shown in fig. 5, the outer sidewall of the cover peripheral component 131 forms an annular step structure 1311, and specifically, an annular protrusion structure may be formed on the outer sidewall of the cover peripheral component 131, and the outer wall of the housing 14 is provided with a groove which is matched with the protrusion structure, and the cover peripheral component is connected with the housing by a protrusion-groove plugging manner. In this example, the structure of the protrusion and the groove is an insertion structure.
In another example, the outer wall of the cover plate peripheral component 131 forms an annular step structure 1321, and specifically, an annular groove structure may be formed on the outer wall of the cover plate peripheral component 131, the outer wall of the housing 14 is provided with a protrusion which is matched with the groove, and the cover plate peripheral component is connected with the housing through a protrusion-groove plugging manner. In this example, the structure of the protrusion and the groove is an insertion structure.
The cover plate peripheral component 131 is of a U-shaped structure, the cover plate peripheral component 131 is in sealing connection with the shell in an indirect welding or direct welding mode, in the embodiment, when the shell 14 and the cover plate peripheral component 131 are welded after being matched with each other in an insertion mode, in the welding process, due to the guiding effect and the fixing effect of the insertion structure, mutual transverse dislocation cannot occur between the outer side wall of the cover plate peripheral component 131 and the shell 14, and the sealing performance of the shell 14 and the metal cover plate 13 is improved.
Although certain specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. A needle type lithium ion battery is characterized by comprising a cap cover, a shell and a bottom cover; the bottom cover is welded with one end of the shell;
the cap comprises a stem, an annular part surrounding the periphery of the stem and a metal cover plate surrounding the periphery of the annular part, and the metal cover plate is welded with the other end of the shell;
the core column is connected with one pole of a winding core, the core column is configured to be used as one electrode of a needle type lithium ion battery, the bottom cover is connected with the other pole of the winding core, and the bottom cover, the shell and the metal cover plate are configured to be used as the other electrode of the needle type lithium ion battery;
the outer diameter of the shell is less than or equal to 8 mm.
2. The lithium ion battery of claim 1, wherein the metal cover plate is provided with an electrolyte injection hole configured to inject an electrolyte into the needle-type lithium ion battery; the metal cover plate further comprises a pole column, and the pole column is configured to be used for plugging the liquid injection hole.
3. The lithium ion battery of claim 2, wherein the pole protrudes out of the upper surface of the metal cover plate and is connected with the winding core; the pole is configured to be connected with an external device as an electrode of the lithium ion battery.
4. The lithium ion battery of claim 1, wherein the stem is configured to protrude from an upper surface of the glass layer, and the stem is connected to an external device as an electrode of the lithium ion battery.
5. The lithium ion battery of claim 1, wherein a thinned region is disposed on a sidewall of the housing, the thinned region having a notch formed therein.
6. The lithium ion battery of claim 1, wherein an insulating pad is disposed on an upper surface of the metal cover plate.
7. The lithium ion battery of claim 1, wherein an insulating support is disposed between the metal cover plate and the winding core, the insulating support is disposed inside the open end of the case and forms a hollow structure.
8. The lithium ion battery of claim 1, wherein the metal cover plate comprises a cover plate peripheral component, and an outer side wall of the cover plate peripheral component is buckled outside the open end of the shell.
9. The lithium ion battery of claim 8, wherein the cover plate peripheral component is hermetically connected with the open end of the shell by welding after being matched and connected with the open end of the shell.
10. The lithium ion battery of claim 8 or 9, wherein the open end of the housing comprises a guiding section and a matching section connected with each other, the guiding section has an outer diameter smaller than the inner diameter of the outer sidewall, the matching section has an outer diameter larger than the inner diameter of the outer sidewall, and the outer sidewall of the cover peripheral assembly is fastened outside the guiding section and the matching section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921137825.2U CN209981285U (en) | 2019-07-18 | 2019-07-18 | Needle type lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921137825.2U CN209981285U (en) | 2019-07-18 | 2019-07-18 | Needle type lithium ion battery |
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| Publication Number | Publication Date |
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| CN209981285U true CN209981285U (en) | 2020-01-21 |
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| CN201921137825.2U Active CN209981285U (en) | 2019-07-18 | 2019-07-18 | Needle type lithium ion battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110299481A (en) * | 2019-07-18 | 2019-10-01 | 常州微宙电子科技有限公司 | A kind of pin type lithium ion battery |
| CN113036210A (en) * | 2021-03-05 | 2021-06-25 | 广东格林赛福能源科技有限公司 | Preparation method of needle type chargeable and dischargeable battery |
-
2019
- 2019-07-18 CN CN201921137825.2U patent/CN209981285U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110299481A (en) * | 2019-07-18 | 2019-10-01 | 常州微宙电子科技有限公司 | A kind of pin type lithium ion battery |
| CN113036210A (en) * | 2021-03-05 | 2021-06-25 | 广东格林赛福能源科技有限公司 | Preparation method of needle type chargeable and dischargeable battery |
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