CN216624417U - 1.5V constant voltage lithium battery - Google Patents
1.5V constant voltage lithium battery Download PDFInfo
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- CN216624417U CN216624417U CN202220078906.5U CN202220078906U CN216624417U CN 216624417 U CN216624417 U CN 216624417U CN 202220078906 U CN202220078906 U CN 202220078906U CN 216624417 U CN216624417 U CN 216624417U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application relates to a 1.5V constant-voltage lithium battery, which comprises an electric core, wherein a conductive cap is arranged at the top of the electric core, the conductive cap is an anode of the electric core, and the bottom and the side surfaces of the electric core are cathodes of the electric core; the battery cell is arranged on the battery cell and used for keeping the constant working voltage of the constant-voltage lithium battery to be 1.5V; the voltage reduction circuit board comprises a positive input end and a negative common end, the positive input end is connected with the positive electrode of the battery cell, the negative common end is connected with the side face of the battery cell, a conducting electrode column is further arranged at the top of the voltage reduction circuit board, and the conducting electrode column is the positive output voltage of the constant-voltage lithium battery. The application has the effect of providing a constant operating voltage of 1.5V.
Description
Technical Field
The application relates to the technical field of lithium batteries, in particular to a 1.5V constant-voltage lithium battery.
Background
In daily life, batteries are widely used due to the characteristics of simple charging and discharging operation, convenient carrying and stable and reliable performance. Such as electric toothbrushes, remote controls, clocks, toys, etc., we can often see the image of the battery.
The more common batteries are generally a No. 5 battery, a No. 7 battery and a nickel-metal hydride battery, the No. 5 battery and the No. 7 battery are disposable batteries, and in the use process, the voltages of the No. 5 battery and the No. 7 battery are gradually reduced, namely the constant working voltage of 1.5V cannot be kept; although the voltage of the nickel-metal hydride battery can be recovered by a special charger after the nickel-metal hydride battery is used, the voltage is gradually reduced in the using process, and the working voltage of 1.5V cannot be maintained. While some devices operate at a constant operating voltage of 1.5V or at an operating voltage that cannot be lower than 1.2V.
With respect to the related art in the above, the inventors consider that there is a problem in that the battery cannot provide a constant operating voltage of 1.5V.
SUMMERY OF THE UTILITY MODEL
In order to provide a constant working voltage of 1.5V, the application provides a 1.5V constant-voltage lithium battery.
The application provides a 1.5V constant voltage lithium cell adopts following technical scheme:
a constant-voltage lithium battery comprises a battery cell, wherein a conductive cap is arranged at the top of the battery cell, the conductive cap is a positive electrode of the battery cell, and the bottom and the side surfaces of the battery cell are negative electrodes of the battery cell;
the voltage reduction circuit board is arranged on the battery cell and used for keeping the constant output of 1.5V working voltage of the constant-voltage lithium battery;
the voltage reduction circuit board comprises a positive input end and a negative common end, the positive input end is connected with the positive electrode of the battery cell, the negative common end is connected with the side face of the battery cell, a conducting electrode column is further arranged at the top of the voltage reduction circuit board, and the conducting electrode column is the positive output voltage of the constant-voltage lithium battery.
Through adopting above-mentioned technical scheme, the step-down circuit board is connected with electric core, has added the circuit structure of a steady voltage between the positive and negative poles that is equivalent to electric core, causes the constant voltage lithium cell during operation, and the operating voltage of 1.5V is continuously stably exported, and when the constant voltage lithium cell provided outside electrical apparatus operating voltage, can provide the operating environment of a 1.5V constant voltage of outside electrical apparatus steadily.
Optionally, the power supply further comprises two thimbles respectively arranged at the positive input end and the negative common end, and the thimbles have elasticity.
Through adopting above-mentioned technical scheme, the thimble plays the effect of making level and connecting, is convenient for be connected between step-down circuit board and the electric core, and in addition, the thimble has certain elasticity, when fixed with electric core, is convenient for adjust the distance between step-down circuit board and the electric core.
Optionally, the battery further comprises a bracket, which is arranged between the battery cell and the step-down circuit board and used for limiting the step-down circuit board; the support is provided with a positive electrode limiting hole in the center, a negative electrode limiting hole in the center, and a convex block is arranged on the circumferential edge of one side of the support facing the voltage reduction circuit board and abutted against the bottom surface of the voltage reduction circuit board.
Through adopting above-mentioned technical scheme, the anodal input of step-down circuit board passes the positive spacing hole of positive pole through the thimble and is connected with the positive pole of electric core, and the negative pole common end of step-down circuit board is connected through the side of thimble with electric core, and for being connected with the negative pole of electric core, step-down circuit board and the mutual butt of support can carry out spacing and supported effect to step-down circuit board.
Optionally, the voltage step-down circuit further comprises a protective cap, which is arranged on the battery cell and used for protecting the voltage step-down circuit board and the bracket; the top wall of the protective cap is provided with a positioning hole, the conductive electrode column penetrates through the positioning hole, the protective cap covers the voltage-reducing circuit board and the support, and the protective cap is connected with the battery cell.
By adopting the technical scheme, when the protective cap is connected with the battery cell, the voltage reduction circuit board and the support are positioned inside the protective cap, so that the protective and attractive effects can be achieved. In addition, when the constant voltage lithium battery is used, the output voltage anode of the constant voltage lithium battery passes through the hole of the protective cap and is exposed outside, namely, the conductive pole column is exposed outside, and voltage can be provided by abutting against the output voltage anode of the lithium battery and the bottom of the battery core.
Optionally, a rolling groove is circumferentially formed in the outer portion of the battery cell, and the rolling groove is close to the positive electrode of the battery cell.
By adopting the technical scheme, when the protective cap is matched with the battery cell, the contact area between the protective cap and the battery cell is reduced due to the arrangement of the rolling groove, the protective cap is conveniently connected with the battery cell cover, and when the protective cap is connected with the battery cell, the edge of the protective cap just covers the rolling groove to play a limiting role.
Optionally, the battery cell is divided into a first-stage necking and a second-stage necking by the rolling groove, the diameter of the first-stage necking is smaller than that of the second-stage necking, and the diameter of the second-stage necking is consistent with that of the protective cap.
By adopting the technical scheme, the diameter of the first-stage necking is smaller than that of the second-stage necking, the diameter of the protective cap is equal to that of the second-stage necking, when the protective cap is matched with the battery core, the protective cap is conveniently sleeved in the battery core, and the protective cap is level to the outer surface of the second-stage necking.
Optionally, the bottom of the battery is provided with a protrusion.
Through adopting above-mentioned technical scheme, when using the constant voltage lithium cell, the bellying can with the mutual butt of outside electrical apparatus output, the bellying is convenient for constant voltage lithium cell and outside electrical apparatus are fixed and are connected.
Optionally, the protective cap is provided with a charging port for a USB charging wire to pass through, the step-down circuit board is provided with a USB charging port, and the USB charging port faces the charging port.
Through adopting above-mentioned technical scheme, when the constant voltage lithium cell does not have the electricity, the USB charging wire that will connect the power passes the mouth that charges and charges the interface connection with USB, can in time charge for the constant voltage lithium cell, makes things convenient for operation person's use, need not just can charge for the constant voltage lithium cell through special charger, the reuse of the constant voltage lithium cell of being convenient for.
Optionally, the step-down circuit board is provided with an LED indicator light for prompting the charging state of the constant-voltage lithium battery.
Through adopting above-mentioned technical scheme, when the constant voltage lithium cell does not have the electricity, external USB charging wire is connected with the USB interface that charges to for constant voltage lithium cell charging, when constant voltage lithium cell electric quantity is full, the LED pilot lamp lights, the suggestion user constant voltage lithium cell electric quantity is full.
Optionally, the top surface of the first-stage necking and the top surface of the conductive cap are in the same horizontal plane.
Through adopting above-mentioned technical scheme, the top surface of one-level throat is level with the top surface of electrically conductive block, can be that the deformation that the thimble took place is unanimous, more is favorable to the stability of being connected between step-down circuit board and the electric core.
In summary, the present application includes at least one of the following beneficial technical effects:
providing a constant working voltage of 1.5V;
the device is conveniently connected with an external electric appliance;
the voltage reduction circuit board is connected with the battery cell more stably;
and the battery cell is better protected.
Drawings
Fig. 1 is an exploded view of a constant voltage lithium battery according to an embodiment.
FIG. 2 is a circuit diagram of a buck circuit board according to an embodiment.
Fig. 3 is a schematic structural view of a constant voltage lithium battery according to an embodiment.
Fig. 4 is a schematic structural diagram of the voltage-reducing circuit board, the bracket, and the battery cell according to the embodiment.
FIG. 5 is a schematic view of a constant voltage lithium battery according to an embodiment.
Description of reference numerals: 1. an electric core; 11. a conductive cap; 2. a step-down circuit board; 21. A conductive electrode column; 22. a thimble; 3. a support; 31. a positive electrode limiting hole; 32. a negative electrode limiting hole; 33. a bump; 4. a protective cap; 41. positioning holes; 5. a voltage reduction circuit module; 6. a filter circuit module; 7. rolling a groove; 71. primary necking; 72. secondary necking; 8. a charging port; 9. a USB charging interface; 10. a raised portion.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The embodiment of the application discloses 1.5V constant voltage lithium cell, when outside electrical apparatus is connected with the constant voltage lithium cell, can obtain a 1.5V invariable operating voltage.
The first embodiment is as follows:
referring to fig. 1, the constant voltage lithium battery includes electric core 1, the top of electric core 1 is provided with electrically conductive block 11, electrically conductive block 11 is the positive pole of electric core 1, the side and the bottom surface of electric core 1 are the negative pole of electric core 1, the constant voltage lithium battery still includes step-down circuit board 2, step-down circuit board 2 is provided with the common end of positive input end and negative pole, the positive input end is connected with the positive pole of electric core 1, the common end of negative pole is connected with the side of electric core 1, be equivalent to being connected with the negative pole of electric core 1, step-down circuit board 2 can make the positive negative pole of constant voltage lithium battery output stable 1.5V's operating voltage, step-down circuit board 2's top is provided with leads electrode column 21, when external electrical apparatus is connected with the constant voltage lithium battery, lead electrode column 21 and electric core 1's bottom through the butt, external electrical apparatus just can obtain a stable operating voltage.
Through the voltage reduction circuit board 2, the constant voltage lithium battery is enabled to output 1.5V stable working voltage, the voltage output by the battery cell 1 is 3.2V or 3.7V, and the voltage reduction circuit board 2 reduces the voltage output by the battery cell 1 so as to realize that the positive electrode and the negative electrode of the constant voltage lithium battery can output 1.5V constant working voltage.
Specifically, referring to fig. 2, the voltage-reducing circuit board 2 includes a voltage-reducing circuit module 5 and a filter circuit module 6, the voltage-reducing circuit module 5 is connected to the positive and negative poles of the battery cell 1, the voltage-reducing circuit module 5 obtains a voltage of 3.2V or 3.7V, the voltage-reducing circuit module 5 reduces the voltage of 3.2V or 3.7V to 1.5V, the filter circuit module 6 receives the voltage of 1.5V and performs filtering processing to obtain a stable working voltage of 1.5V, and the working voltage is applied to the negative electrodes of the conductive electrode post 21 and the battery cell 1, so that the constant-voltage lithium battery outputs the stable working voltage of 1.5V.
More specifically, referring to fig. 2 again, the voltage dropping circuit module 5 includes a filter capacitor C1, a resistor R1 and a chip, a model of the chip used in this embodiment is LC9201D, two ends of the filter capacitor C1 are connected to an anode of the electrical core 1, the filter capacitor C1 performs filtering processing on a voltage of 3.2V or 3.7V provided by the electrical core 1, a connection end of the filter capacitor C1 and the anode of the electrical core 1 is further connected to the chip pin 2, a connection point of the filter capacitor C1 and the cathode of the electrical core 1 is connected to the electrical core 1 ground and the chip pin 4, two ends of the resistor R1 are respectively connected to the cathode of the electrical core 1 and the chip pin 1, the resistor R1 plays a role of limiting current, and the voltage dropping circuit module 5 drops the operating voltage of the electrical core 3.2V or 3.7V to the operating voltage of 1.5V.
Further, referring to fig. 2 again, the filter circuit module 6 includes a secondary filter inductor L1 and a secondary filter capacitor C2, the pin No. 5 of the chip is connected to the pin No. 6, and the connection between the pin No. 5 and the pin No. 6 is further connected to one end of a secondary filter inductor L1, and the other end of the secondary filter inductor L1 is connected to the conductive cap 11. One end of the second-stage filter capacitor C2 is connected with the conductive cap 11, and the other end is connected with the pin 9 of the chip. The filter circuit module 6 receives the 1.5V voltage, and the secondary filter capacitor C2 performs filtering processing on the 1.5V circuit to obtain a more stable 1.5V working voltage. The maximum output current of the constant-voltage lithium battery is 1.5V, and the constant-voltage lithium battery has the functions of overcharge, overdischarge, over-temperature, short-circuit protection and the like.
The stable 1.5V constant voltage operating voltage that step-down circuit board 2 obtained through step-down circuit module 5 and filter circuit module 6, when being connected step-down circuit board 2 with electric core 1, in order to make things convenient for electric core 1 to be connected with step-down circuit board 2 more, refer to fig. 1 again, step-down circuit board 2 is provided with thimble 22 respectively at positive input end and the common end of negative pole, be connected with the positive negative pole of electric core 1 through thimble 22, thimble 22 still has certain elasticity in addition, when the constant voltage lithium cell is connected with external electrical apparatus, thimble 22 has certain elasticity, certain deformation can take place, be convenient for adjust the distance between step-down circuit board 2 and electric core 1, also be convenient for the connection between step-down circuit board 2 and the electric core 1, thimble 22 plays the effect of making level.
Can realize the better connection of step-down circuit board 2 and electric core 1 through thimble 22, and be convenient for during the constant voltage lithium cell installation advances outside electrical apparatus, but step-down circuit board 2 is unstable relatively with being connected of electric core 1, based on the aforesaid problem, refer to fig. 1 and fig. 3, be provided with support 3 between step-down circuit board 2 and the electric core 1, anodal spacing hole 31 and the spacing hole of negative pole 32 have been seted up at support 3's center, the anodal input end of step-down circuit board 2 is located the center, anodal input end passes anodal spacing hole 31 through thimble 22 and is connected with electrically conductive bonnet 11, the common end of negative pole of step-down circuit board 2 is located the border, the common end of negative pole passes the spacing hole of negative pole 32 through thimble 22, be connected with the side of electric core 1.
In addition, the top border circumference of support 3 is provided with lug 33, and when support 3, electric core 1 and 2 three cooperations of step-down circuit board, the bottom and the 1 butt of electric core of support 3, support 3 carries on spacingly to thimble 22 simultaneously.
The support 3 makes the electric core 1 and the step-down circuit board 2 fixed more stable, in order to further make the step-down circuit board 2 fixed with the electric core 1, refer to fig. 3 and fig. 4, the constant voltage lithium battery further includes a protective cap 4, a hole is opened at the top of the protective cap 4, the electrode guide post 21 passes through the hole, the step-down circuit board 2 and the support 3 are located inside the protective cap 4, through the fixation of the protective cap 4 and the electric core 1, the protective cap 4 can be connected with the electric core 1 through a spot welding mode, and the step-down circuit board 2 and the support 3 are fixed inside the constant voltage lithium battery. The external electrical appliance is connected with the conductive electrode column 21 and the bottom of the battery cell 1, so that a constant voltage working voltage of 1.5V can be obtained.
Step-down circuit board 2 can be connected with electric core 1 comparatively steadily, then when sealing protective cap 4 lid on electric core 1, there will be certain resistance, based on the above-mentioned problem, refer to fig. 4 again, rolling groove 7 has been seted up to the outside circumference of electric core 1, rolling groove 7 closes on the positive pole of electric core 1, when protective cap 4 is connected with electric core 1, can cover rolling groove 7, and protective cap 4's border just covers rolling groove 7, through reducing the area of contact of protective cap 4 and electric core 1, cause protective cap 4 to be connected with electric core 1 comparatively easily, in addition, rolling groove 7 still helps electric core 1 to place stably.
Referring to fig. 4 again, the rolling groove 7 divides the battery cell 1 into a first-level necking 71 and a second-level necking 72, the portion of the battery cell 1 adjacent to the positive electrode of the battery cell 1 is the first-level necking 71, the diameter of the first-level necking 71 is smaller than that of the second-level necking 72, the diameter of the second-level necking 72 is equal to that of the protective cap 4, so that the protective cap 4 can be easily sealed with the battery cell 1, the diameter of the protective cap 4 is equal to that of the second-level necking 72, when the protective cap 4 is sealed with the battery cell 1, the protective cap 4 is flat with the outer surface of the battery cell 1, so that a constant-voltage lithium battery can be conveniently fixed with an external electrical appliance, in addition, the top surface of the first-level necking 71 and the top surface of the conductive cap 11 are on the same horizontal plane, when the voltage-reducing circuit board 2 is connected with the battery cell 1, the deformation of the ejector pin 22 is consistent, and the stability of connection between the voltage-reducing circuit board 2 and the battery cell 1 is more facilitated.
In addition, referring to fig. 4 again, in order to facilitate fixing when the constant voltage lithium battery is connected to an external electrical appliance, a protrusion 10 is further disposed at the bottom of the battery cell 1, and the protrusion 10 is a circular block, and the circular block is located at the center of the battery cell 1.
The implementation principle of a 1.5V constant voltage lithium battery in the embodiment of the application is as follows: the constant voltage lithium battery comprises a battery core 1 and a voltage reduction circuit board 2, wherein the battery core 1 is provided with a positive electrode and a negative electrode, the positive electrode input end of the voltage reduction circuit board 2 is connected with the positive electrode of the battery core 1, the negative electrode common end of the voltage reduction circuit board 2 is connected with the negative electrode of the battery core 1, and the voltage reduction circuit board 2 reduces the voltage output by the battery core 1 so as to obtain a stable working voltage of 1.5V.
Example two:
the difference between the first embodiment and the second embodiment is that:
referring to fig. 5, step-down circuit board 2 is provided with the USB interface 9 that charges, and the USB interface 9 that charges is fixed on step-down circuit board 2 through the welded mode, and the positive negative pole of the USB interface 9 that charges welds with the solder joint that step-down circuit board 2 corresponds to realize that the USB charges interface 9 and step-down circuit board 2's electric connection, protective cap 4 seted up with the USB interface 9 matched with that charges interface 8 that charges, the USB charge interface 9 towards the interface 8 that charges. When the constant voltage lithium cell does not have the electricity, the charging wire that will be connected with the power passes charging interface 8 to be connected with USB interface 9 that charges, can charge for the constant voltage lithium cell.
The step-down circuit board still is provided with the LED pilot lamp, and this application does not do the injecing to the concrete position of LED pilot lamp, and when constant voltage lithium cell electric quantity was full, the LED pilot lamp can light for the suggestion user, convenient to use person uses.
The principles of the first embodiment are the same as those of the second embodiment, and are not described herein again.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The utility model provides a 1.5V constant voltage lithium cell which characterized in that:
the battery comprises a battery cell (1), wherein a conductive cap (11) is arranged at the top of the battery cell (1), the conductive cap (11) is the positive electrode of the battery cell (1), and the bottom and the side surfaces of the battery cell (1) are the negative electrodes of the battery cell (1);
the voltage reduction circuit board (2) is arranged on the battery core (1) and is used for keeping the constant output of 1.5V working voltage of the constant-voltage lithium battery;
wherein, step-down circuit board (2) include positive input end and negative pole common end, the positive input end with the positive pole of electric core (1) is connected, the negative pole common end with electric core (1) side is connected, the top of step-down circuit board (2) still is provided with guide electrode post (21), guide electrode post (21) are the output voltage positive pole of constant voltage lithium cell.
2. The 1.5V constant voltage lithium battery as claimed in claim 1, wherein:
two thimbles (22), set up respectively in positive pole input end with the negative pole is total to be held, thimble (22) have elasticity.
3. A 1.5V constant voltage lithium battery as claimed in claim 2, wherein:
the support (3) is arranged between the battery cell (1) and the voltage reduction circuit board (2) and used for limiting the voltage reduction circuit board (2);
wherein, anodal spacing hole (31) have been seted up at the center of support (3), spacing hole of negative pole (32) have still been seted up in support (3), spacing hole of negative pole (32) are located the border of support (3), support (3) towards one side circumference border of step-down circuit board (2) is provided with lug (33), lug (33) with the bottom surface butt of step-down circuit board (2).
4. A 1.5V constant voltage lithium battery as claimed in claim 3, wherein:
the protective cap (4) is arranged on the battery cell (1) and used for protecting the voltage reduction circuit board (2) and the bracket (3);
the top wall of the protective cap (4) is provided with a positioning hole (41), the conductive electrode column (21) penetrates through the positioning hole (41), the protective cap (4) covers the depressurization circuit board (2) and the support (3), and the protective cap (4) is connected with the battery core (1).
5. The 1.5V constant voltage lithium battery of claim 4, wherein: a rolling groove (7) is formed in the circumferential direction of the outer portion of the battery cell (1), and the rolling groove (7) is close to the positive electrode of the battery cell (1).
6. The 1.5V constant voltage lithium battery as claimed in claim 5, wherein: the battery cell is divided into a first-stage necking (71) and a second-stage necking (72) by the rolling groove (7), the diameter of the first-stage necking (71) is smaller than that of the second-stage necking (72), and the diameter of the second-stage necking (72) is consistent with that of the protective cap (4).
7. The 1.5V constant voltage lithium battery as claimed in claim 1, wherein: the bottom of the battery cell (1) is provided with a protruding part (10).
8. The 1.5V constant voltage lithium battery as claimed in claim 4, wherein: the USB charging device is characterized in that a charging port (8) for a USB charging wire to pass through is formed in the protective cap (4), the voltage reduction circuit board (2) is provided with a USB charging port (9), and the USB charging port (9) faces the charging port (8).
9. The 1.5V constant voltage lithium battery as claimed in claim 8, wherein: the voltage reduction circuit board (2) is provided with an LED indicating lamp used for prompting the charging state of the constant-voltage lithium battery.
10. The 1.5V constant voltage lithium battery as claimed in claim 6, wherein: the top surface of the primary necking (71) and the top surface of the conductive cap (11) are in the same horizontal plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220078906.5U CN216624417U (en) | 2022-01-12 | 2022-01-12 | 1.5V constant voltage lithium battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220078906.5U CN216624417U (en) | 2022-01-12 | 2022-01-12 | 1.5V constant voltage lithium battery |
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| CN216624417U true CN216624417U (en) | 2022-05-27 |
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| CN202220078906.5U Active CN216624417U (en) | 2022-01-12 | 2022-01-12 | 1.5V constant voltage lithium battery |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115312957A (en) * | 2022-08-22 | 2022-11-08 | 深圳市东方芯愿新能源有限公司 | Rapid assembly process of rechargeable lithium battery |
| CN116936944A (en) * | 2023-09-15 | 2023-10-24 | 深圳市东方芯愿新能源有限公司 | Manufacturing method of small-diameter rechargeable lithium battery |
| CN117673498A (en) * | 2024-02-02 | 2024-03-08 | 深圳市华美兴泰科技股份有限公司 | Low-voltage lithium battery |
-
2022
- 2022-01-12 CN CN202220078906.5U patent/CN216624417U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115312957A (en) * | 2022-08-22 | 2022-11-08 | 深圳市东方芯愿新能源有限公司 | Rapid assembly process of rechargeable lithium battery |
| CN116936944A (en) * | 2023-09-15 | 2023-10-24 | 深圳市东方芯愿新能源有限公司 | Manufacturing method of small-diameter rechargeable lithium battery |
| CN117673498A (en) * | 2024-02-02 | 2024-03-08 | 深圳市华美兴泰科技股份有限公司 | Low-voltage lithium battery |
| CN117673498B (en) * | 2024-02-02 | 2024-04-12 | 深圳市华美兴泰科技股份有限公司 | Low-voltage lithium battery |
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