CN220086187U

CN220086187U - Lithium battery for electric bicycle

Info

Publication number: CN220086187U
Application number: CN202321492164.1U
Authority: CN
Inventors: 陈虎; 祝伟甲; 樊晓妍; 李进彪; 陈福; 史生辉; 邹雨桐; 何如喜
Original assignee: Qinghai Qiyu Network Technology Co ltd
Current assignee: Qinghai Qiyu Network Technology Co ltd
Priority date: 2023-06-13
Filing date: 2023-06-13
Publication date: 2023-11-24
Anticipated expiration: 2033-06-13

Abstract

The utility model relates to a lithium battery for an electric bicycle, which comprises a shell for protecting a lithium battery pack, wherein a heating film is connected with a charging device through a portable power socket for temperature compensation, heat is exchanged through a heat conducting piece to realize heat dissipation and heat absorption, a hidden BMS-PCB structure prevents artificial damage and theft prevention, LFP electric cores are adopted to form the lithium battery pack, a heat transfer guide sheet is arranged between the electric cores in a matched manner for heat collection or heat release, heat is collected through the heat collection sheet, and then heat exchange is carried out through the heat dissipation sheet, so that the lithium battery pack has the dual functions of heat dissipation and temperature compensation in cold seasons. The lithium battery has good use effect, can be used for power supplies of electric tricycles and electric motorcycles, and is suitable for application in cold regions.

Description

Lithium battery for electric bicycle

Technical Field

The utility model relates to the field of lithium batteries, in particular to a lithium battery for an electric bicycle.

Background

As a walking tool, the electric bicycle is greatly convenient for residents to travel, and the lithium battery for the electric bicycle is also mainstream, so that various types of lithium batteries are available for consumers to select in the market. The problems of the currently known lithium batteries are: (1) Item 4.1 of GB 17761-2018, item e) specifies that the nominal battery voltage should not be greater than 48V; (2) The internal circuit of the lithium battery is messy, which is not beneficial to welding and later maintenance; (3) Under the cold climate condition, the lithium battery needs to be warmed to consume the electric energy of the battery inside, thereby influencing the service life of the battery; (4) The lithium battery has a certain heat dissipation problem, and needs to be improved; (5) The safety use performance of the lithium battery is improved, and the anti-theft effect is good.

Disclosure of Invention

The utility model provides a lithium battery for an electric bicycle aiming at the related problems in the background art, which adopts the following technical scheme: the lithium battery for the electric bicycle comprises a shell 9, wherein the shell 9 comprises a battery compartment 91 and a top cover 92; a handle 7 is arranged in the middle of the upper surface of the top cover 92, and a power socket 8 and a portable power socket 6 are arranged on the upper surface of the top cover 92; the power socket 8 comprises a charging socket 81 and a discharging socket 82 which are symmetrically arranged; the battery compartment 91 is riveted with the top cover, and the lithium battery pack 5, the heating film 1, the partition plate 05 and the BMS-PCB 01 are installed in the battery compartment 91.

Further, the lithium battery pack 5 is formed by connecting 16 soft package LFP battery cells 51 in series, a heating film 1 is installed at the lower part of the lithium battery pack 5, a partition board 05 is arranged at the bottom of the heating film 1, the partition board 05 is fixedly installed at the lower part of a battery compartment 91, and a BMS-PCB 01 is installed in a space reserved at the bottom of the partition board; the 16 soft package LFP battery cells 51 are connected in series, the 1 st negative electrode is electrically connected with the 2 nd positive electrode, and the 16 th positive electrode is electrically connected with the positive electrode battery cell access terminal on the BMS-PCB board 01 by analogy, the 1 st positive electrode is connected with the positive electrode battery cell access terminal on the BMS-PCB board 01 by wires, the BMS-PCB board 01 is also provided with 2 positive electrode terminals, one positive electrode terminal is connected with the discharging socket 82 by wires, the other positive electrode terminal is connected with the charging socket 81 by wires, and the 16 th negative electrode is connected with the discharging socket 82 and the charging socket 81, so that a direct current loop is formed; the positive electrodes of the 16 soft package LFP battery cells 51 and the negative electrodes of the 16 th soft package LFP battery cells are led out through signal cables and then connected with a signal end of the BMS-PCB 01, so that a signal acquisition line is formed; the heating film 1 is connected with a portable power socket 6 through an electric wire.

Further, the positive and negative electrodes of the soft package LFP battery core 51 are positioned on the same side, and the positive and negative electrodes are connected in series through the pole piece wiring PCB 02; positive and negative electrode lines 023 and a battery cell signal acquisition line 024 are printed on the pole piece wiring PCB 02, and positive and negative terminals 021 and a signal line terminal 022 which are fixed on the pole piece wiring PCB 02 are correspondingly connected with the BMS-PCB 01 through a power strip line.

Further, heat transfer guide sheets 4 are sandwiched between the soft package LFP electric cores 51, each heat transfer guide sheet 4 is connected with the heat collecting sheet 3 to form an integrated heat conducting piece, the lower part of the heat conducting piece is in close contact with the heat radiating sheet 2, the lower part of the heat radiating sheet 2 is provided with a heating film 1, and the lower part of the heating film 1 is provided with a partition plate 05; the baffle 05 is a square body with an opening at the lower part, the top of the inside of the baffle is fixed with a heat insulation film 03, and a BMS-PCB 01 is arranged below the heat insulation film 03.

Further, after the soft package LFP batteries 51 are grouped, they are fixed by the upper and lower insulating tapes 04.

Further, the heat transfer guide sheet 4 is arranged in a grid shape, and the soft package LFP battery core 51 is clamped between two grid sheets; the heat collecting sheet 3 is fixedly connected with one end of the heat transfer guide sheet 4; the heat transfer guide sheet 4 and the heat collecting sheet 3 are one of copper mold and aluminum film.

Further, one surface of the heat sink 2 is a surface of the fins 21 processed into an array shape, and the opposite surface is a polished plane; the heat sink 2 is made of aluminum alloy.

Further, a cable groove 051 is formed in the middle of each side of the partition board 05, so that the cable can pass through the extension socket.

Further, a temperature sensor is installed on the side surface of the lithium battery pack 5, and the temperature sensor is connected with the BMS-PCB 01 through a power strip.

Further, the lithium battery pack 5 is placed in the battery compartment 91, and the surfaces of the upper insulating adhesive tape (04) and the lower insulating adhesive tape (04) are lined with adhesive rubber buffer strips.

The implementation of the utility model has the beneficial effects that: the lithium battery for the electric bicycle can also be used for power supplies of electric tricycles and electric motorcycles, and is suitable for application in cold regions. The characteristics are as follows: (1) The battery is provided with the portable power socket 6, and the charger baby is used for providing electric energy for the heating film 1, so that the consumption of the electric energy of the battery in the lithium battery is avoided, the service life of the battery is further ensured, and the battery is suitable for being used under cold climate conditions; (2) The lithium battery pack 5 formed by connecting 16 soft package LFP battery cells 51 in series accords with the rule of the 4.1 th item e) in GB 17761-2018, and the safety performance of the lithium battery pack is comprehensively improved; (3) The hidden structure of the BMS-PCB 01 not only prevents artificial damage, but also has good anti-theft performance; (4) The heat conducting piece is structured to collect heat of each LFP cell 51 through the heat transfer guide sheet 4, conduct the heat to the heat collecting sheet 3 and diffuse the heat to the side wall space of the battery compartment 91 through the heat radiating sheet 2 to radiate the heat, and conduct the heat through the structure when the temperature of the lithium battery is compensated, so that the good temperature compensation effect of each LFP cell 51 is ensured, and the electric energy consumption of a temperature compensation power supply is reduced; (5) The buzzer is arranged to realize a warning function so as to remind the lithium battery of faults; (6) The GPS and the 4G can monitor the lithium battery on line through BMS-PCB 01 management software to acquire the electric parameter data and the instant position.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1: the shell is schematically shown in the utility model;

fig. 2: schematic diagram of lithium battery pack in the utility model;

fig. 3: a schematic diagram of the electrical connection of the lithium battery pack;

fig. 4: FIG. 2 is a top view;

fig. 5: FIG. 4 is a sectional view B-B;

fig. 6: schematic diagram of a heat conducting member;

fig. 7: a schematic diagram of a heat sink;

fig. 8: a schematic diagram of a partition;

fig. 9: a handle section view;

in the figure: the battery pack comprises a shell 9, a battery compartment 91, a top cover 92, a power socket 8, a charging socket 81, a discharging socket 82, a lifting handle 7, a U-shaped ring 71, an antenna seat 72, a plum blossom screw 73, a hexagonal nut 74, a GPS antenna 75, a 4G antenna 76, a portable power socket 6, a lithium battery pack 5, a soft package LFP electric core 51, a heat transfer guide piece 4, a heat collection piece 3, a radiating piece 2, a rectangular piece 21, a heating film 1, a BMS-PCB 01, a pole piece wiring PCB 02, a positive pole terminal 021, a signal line terminal 022, a positive pole line 023, a battery cell signal acquisition line 024, a heat insulation film 03, an insulating tape 04, a partition board 05 and a cable groove 051.

Description of the embodiments

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In one embodiment of the present utility model, please refer to fig. 1.

Example 1: a lithium battery for an electric bicycle, comprising a housing 9, the housing 9 comprising a battery compartment 91 and a top cover 92; a handle 7 is arranged in the middle of the upper surface of the top cover 92, and a power socket 8 and a portable power socket 6 are arranged on the upper surface of the top cover 92; the power socket 8 comprises a charging socket 81 and a discharging socket 82 which are symmetrically arranged; the battery compartment 91 is riveted with the top cover, and the lithium battery pack 5, the heating film 1, the partition plate 05 and the BMS-PCB 01 are installed in the battery compartment 91.

The lithium battery for the electric bicycle is characterized in that the lithium battery pack 5 is electrically connected with a BMS-PCB (battery management system-printed circuit board) 01, the BMS-PCB 01 is electrically connected with a charging socket 81 and a discharging socket 82, and the heating film 1 is electrically connected with a portable power socket 6; in the use process, the heating film 1 can provide heat for the lithium battery pack 5 under the cold climate condition so as to achieve better lithium battery discharge temperature, so that the lithium battery pack is suitable for the use in the cold region environment, an externally connected power supply can be connected into the portable power socket 6 by adopting the charger, the flexibility is better, the use of the lithium battery pack 5 for providing a heating power supply is avoided, and the lithium battery pack 5 is not in accordance with the discharge requirement at low temperature, and the service life of the lithium battery pack is influenced due to the damage of materials in a battery core caused by frequent discharge, so that the lithium battery pack is not economical; the charging device solves the problem by adopting the charging device, and the charging device is beneficial to the situation that the charging device is usually carried around and cannot be charged in a low-temperature environment, and the charging device can usually meet the requirement of discharging under the circumstance.

Example 2: for a specific structure of embodiment 1, please refer to fig. 2 and 3: the lithium battery pack 5 is formed by connecting 16 soft package LFP electric cores 51 in series, a heating film 1 is arranged at the lower part of the lithium battery pack 5, a baffle plate 05 is arranged at the bottom of the heating film 1, the baffle plate 05 is fixedly arranged at the lower part of a battery compartment 91, and a BMS-PCB (battery management system-printed circuit board) 01 is arranged in a space reserved at the bottom of the baffle plate 05; in the series connection of the 16 soft package LFP battery cells 51, the 1 st negative electrode is electrically connected with the 2 nd positive electrode, and the 16 th positive electrode is electrically connected with the positive electrode battery cell access terminal on the BMS-PCB board 01 by analogy, and then the 2 positive electrode terminals are arranged on the BMS-PCB board 01, wherein one positive electrode terminal is connected with the discharge socket 82 by an electric wire, the other positive electrode terminal is connected with the charge socket 81 by an electric wire, and the 16 th negative electrode is connected with the discharge socket 82 and the charge socket 81, so that a direct current loop is formed; the positive electrodes of the 16 soft package LFP battery cells 51 and the negative electrodes of the 16 th soft package LFP battery cells are led out through signal cables and then connected with a signal end of the BMS-PCB 01, so that a signal acquisition line is formed; the heating film 1 is connected with a portable power socket 6 through an electric wire.

The nominal voltage of the lithium battery for the electric bicycle is 48V, meets the rule of the 4.1 th item in GB 17761-2018, is suitable for daily use of the electric bicycle, and along with the improvement of the soft package LFP battery core research and development technology and the manufacturing technology, the energy density is continuously improved, and is up to more than 50Ah at present, so that the long-endurance mileage requirement of the electric bicycle is increased. The BMS-PCB 01 is installed in the space where the lower part of the battery compartment 91 and the partition board 05 are located, and has a certain concealment property, so as to prevent the artificial damage to the battery compartment in extreme situations, so that the power management function of the lithium battery is not interrupted or terminated, and related information can be obtained through communication between the BMS-PCB 01 and the wireless network, so that the safety is further improved, and the battery compartment has good anti-theft performance.

Example 3: based on example 2, please refer to fig. 4 and 5: the preferred structure of the lithium battery pack 5 is: the soft package LFP battery core 51 is characterized in that the positive electrode and the negative electrode are positioned on the same side, and the positive electrode and the negative electrode are connected in series through a pole piece wiring PCB 02; positive and negative electrode lines 023 and a battery cell signal acquisition line 024 are printed on the pole piece wiring PCB 02, and positive and negative terminals 021 and a signal line terminal 022 which are fixed on the pole piece wiring PCB 02 are correspondingly connected with the BMS-PCB 01 through a power strip line.

The pole piece wiring PCB 02 is adopted to connect the positive electrode and the negative electrode of each soft package LFP cell 51, thereby avoiding disorder caused by wiring, being beneficial to welding and later maintenance, having compact structure and improving the fastening performance of the soft package LFP cell 51.

The heat transfer guide sheets 4 are clamped between the soft package LFP cells 51, the heat transfer guide sheets 4 are connected with the heat collection sheets 3 to form an integrated heat conduction piece, the lower parts of the heat conduction pieces are tightly contacted with the heat dissipation sheets 2, the lower parts of the heat dissipation sheets 2 are provided with heating films 1, and the lower parts of the heating films 1 are provided with partition plates 05; the baffle 05 is a square body with an opening at the lower part, the top of the inside of the baffle is fixed with a heat insulation film 03, and a BMS-PCB 01 is arranged below the heat insulation film 03.

Because the soft package LFP cell 51 generates certain heat during operation, the heat transfer guide sheet 4 conducts the heat to the heat collection sheet 3, then the heat is emitted through the heat dissipation sheet 2, and finally the heat is exchanged by the side wall of the battery compartment 91; the structure can conduct and radiate the heat of the side surface of each soft package LFP cell 51, so that the heat radiation performance of the soft package LFP cell 51 is improved, and the adverse effect of heat failure is prevented; in addition, the contact surface of the parts can be coated with heat-conducting silicone grease so as to increase the heat-conducting property. Meanwhile, under the cold climate condition, the heat generated by the heating film 1 is collected by the radiating fins 2, and then is uniformly conducted to the side face of each soft package LFP cell 51 through the heat conducting piece, so that the purpose of uniform heating is achieved, and the heating process is rapid, short in time consumption and low in energy consumption, and is more suitable for a scene of using a charger as a heating power supply. The heat insulation film 03 isolates heat from being transferred to the BMS-PCB 01 so as to improve the working condition of the BMS-PCB 01 during electric working, so that the working stability of the BMS-PCB is improved, and a small amount of heat of the BMS-PCB 01 can be emitted from the bottom of the battery compartment 91.

Example 4: based on example 3, please refer to fig. 6-9, wherein:

after the soft package LFP battery cells 51 are grouped, the soft package LFP battery cells are fixed by an upper insulating tape 04 and a lower insulating tape 04.

The heat transfer guide plates 4 are arranged in a grid shape, and the soft package LFP battery core 51 is clamped between the two grid plates; the heat collecting sheet 3 is fixedly connected with one end of the heat transfer guide sheet 4; the heat transfer guide sheet 4 and the heat collecting sheet 3 are one of copper mold and aluminum film.

One surface of the radiating fin 2 is a surface of a rectangular piece 21 processed into an array shape, and the opposite surface is a polished plane; the heat sink 2 is made of aluminum alloy.

The middle part of each side of the partition board 05 is provided with a cable groove 051 so as to pass through the power strip.

The handle 7 comprises a U-shaped ring 71 and an antenna seat 72, the antenna seat 72 is rectangular, two sides of the top surface of the antenna seat are provided with a pair of bolt through holes, the middle part of the short side of the antenna seat is provided with a pair of counter bores, and two ends of the U-shaped ring 71 are clamped into the counter bores; a plum blossom screw 73 and a hexagonal nut 74 are arranged in the bolt through hole, a GPS antenna 75 is arranged between the plum blossom screw 73 and the hexagonal nut 74 at the left side position, and a 4G antenna 76 is arranged between the plum blossom screw 73 and the hexagonal nut 74 at the right side position; the GPS antenna 75 and the 4G antenna 76 are connected with the BMS-PCB 01 through a power strip.

It should be noted that, the temperature sensor, the rubber buffer strip and the BM561B intelligent software board mentioned below are components that can be purchased in the market according to the above embodiment, and in a specific manufacturing process, the components can be matched according to the local conditions, so that the specific position of the components is not shown in the drawings.

And a temperature sensor is arranged on the side surface of the lithium battery pack 5 so as to monitor the surface temperature of the lithium battery pack 5, and the temperature sensor is connected with the BMS-PCB 01 through a power strip.

The lithium battery pack 5 is arranged in the battery compartment 91, and the surfaces of the upper insulating adhesive tape (04) and the lower insulating adhesive tape (04) are lined with adhesive rubber buffer strips, so that the lithium battery pack 5 is prevented from shaking.

The BMS-PCB 01 selects a BM561B intelligent software board produced by a certain factory in China, integrates a Beidou GPS positioning device, is matched with the lithium battery in the embodiment, and is provided with a buzzer for alarming to remind the fault of the lithium battery. Accordingly, there are a wide variety of protective plates available in the market, which can be matched according to the disclosed embodiments of the present utility model.

In the above embodiment, in order to simplify the drawing of the drawing, only necessary pixels are listed, but the connection portions between the components are not shown, and the connection manner may be selected from the alternative manners in the prior art for connection and fixation. The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. A lithium battery for an electric bicycle, characterized by comprising a housing (9), the housing (9) comprising a battery compartment (91) and a top cover (92); a handle (7) is arranged in the middle of the upper surface of the top cover (92), and a power socket (8) and a portable power socket (6) are arranged on the upper surface of the top cover (92); the power socket (8) comprises a charging socket (81) and a discharging socket (82) which are symmetrically arranged; the battery compartment (91) is riveted with the top cover, and a lithium battery pack (5), a heating film (1), a partition plate (05) and a BMS-PCB (01) are arranged in the battery compartment (91).

2. The lithium battery for the electric bicycle according to claim 1, wherein the lithium battery pack (5) is formed by connecting 16 soft package LFP battery cells (51) in series, a heating film (1) is arranged at the lower part of the lithium battery pack (5), a partition plate (05) is arranged at the bottom of the heating film (1), the partition plate (05) is fixedly arranged at the lower part of a battery compartment (91), and a BMS-PCB (01) is arranged in a space reserved at the bottom of the partition plate; the 16 soft package LFP battery cells (51) are connected in series, the 1 st negative electrode is electrically connected with the 2 nd positive electrode, and the 16 th positive electrode is electrically connected with the positive electrode battery cell access terminal on the BMS-PCB (01) by analogy, the 1 st positive electrode is connected with the positive electrode battery cell access terminal on the BMS-PCB (01) by wires, the BMS-PCB (01) is also provided with 2 positive electrode terminals, one positive electrode terminal is connected with the discharging socket (82) by wires, the other positive electrode terminal is connected with the charging socket (81) by wires, and the 16 th negative electrode is connected with the discharging socket (82) and the charging socket (81) to form a direct current loop; the positive electrodes of the 16 soft package LFP battery cores (51) and the negative electrodes of the 16 th soft package LFP battery cores are led out through signal cables and then connected with signal ends of the BMS-PCB (01), so that a signal acquisition line is formed; the heating film (1) is connected with the portable power socket (6) through an electric wire.

3. The lithium battery for the electric bicycle according to claim 2, wherein the soft package LFP battery core (51) is characterized in that the positive and negative electrodes are positioned on the same side, and the positive and negative electrodes are connected in series through a pole piece wiring PCB board (02); positive and negative electrode circuits (023) and an electric core signal acquisition circuit (024) are printed on the pole piece wiring PCB (02), and positive and negative terminals (021) and signal line terminals (022) fixed on the pole piece wiring PCB (02) are correspondingly connected with the BMS-PCB (01) through power strip wires.

4. A lithium battery for an electric bicycle according to claim 3, characterized in that, a heat transfer guide piece (4) is clamped between each soft package LFP electric core (51), each heat transfer guide piece (4) is connected with a heat collecting piece (3) and forms an integrated heat conducting piece, the lower part of the heat conducting piece is tightly contacted with a heat radiating piece (2), a heating film (1) is arranged at the lower part of the heat radiating piece (2), and a baffle plate (05) is arranged at the lower part of the heating film (1); the baffle (05) is a square body with an opening at the lower part, the top of the inside of the baffle is fixedly provided with a heat insulation film (03), and a BMS-PCB (printed circuit board) (01) is arranged below the heat insulation film (03).

5. The lithium battery for the electric bicycle according to claim 4, wherein after each soft package LFP battery cell (51) is assembled, the soft package LFP battery cell is fixed by an upper insulating tape (04) and a lower insulating tape.

6. The lithium battery for the electric bicycle according to claim 5, wherein the heat transfer guide sheet (4) is arranged in a grid shape, and the soft package LFP battery core (51) is clamped between two grid sheets; the heat collecting sheet (3) is fixedly connected with one end of the heat transfer guide sheet (4); the heat transfer guide sheet (4) and the heat collecting sheet (3) are one of copper mold or aluminum film.

7. The lithium battery for electric bicycles according to claim 5, characterized in that one face of the heat sink (2) is a face of fins (21) processed into an array, the opposite face of which is a polished plane; the radiating fin (2) is made of aluminum alloy.

8. The lithium battery for an electric bicycle according to claim 5, wherein a cable groove (051) is formed in the middle of each side of the partition board (05) to pass through the extension cord.

9. The lithium battery for the electric bicycle according to claim 5, wherein a temperature sensor is installed on the side surface of the lithium battery pack (5), and the temperature sensor is connected with the BMS-PCB (01) through a power strip.

10. A lithium battery for an electric bicycle according to any one of claims 6-9, characterized in that the lithium battery pack (5) is housed in a battery compartment (91), and the surfaces of the upper and lower insulating tapes (04) are lined with adhesive rubber buffer strips.