CN223230897U - Lithium battery system - Google Patents

Abstract

The utility model discloses a lithium battery system, which relates to the field of circuit devices or systems for power supply or distribution, and comprises a plurality of lithium battery cores and a support frame, wherein the lithium battery cores are placed on the support frame, positive and negative poles of the lithium battery cores are respectively welded together to form a battery core positive pole and a battery core negative pole, a partition board is fixed at the top of the support frame, the battery core positive pole and the battery core negative pole extend out of the upper end of the partition board, a cover board is positioned above the partition board, a positive pole and a negative pole are fixedly arranged on the cover board, a super capacitor group is fixed on the partition board, the positive pole of the super capacitor group is connected with the positive pole of a battery, and the negative pole is connected with the negative pole of the battery. According to the utility model, a group of super capacitor groups are connected in parallel between the positive binding posts and the negative binding posts on the lithium battery, and the super capacitor groups can charge and discharge along with voltage fluctuation of the generator or during power-off protection of the lithium battery to generate corresponding charge and discharge current, so that a current sensor of a storage battery of the vehicle can detect normal current.

Description

Lithium battery system

Technical Field

The utility model relates to the field of circuit devices or systems for power supply or distribution, in particular to a lithium battery system.

Background

As a battery using lithium metal or lithium alloy as an anode material and using a nonaqueous electrolyte solution, a lithium battery is increasingly used in life due to its excellent performance, and has a large application in electronic products such as computers, mobile phones, etc., electric bicycles, and electric automobiles. While lithium ion batteries have many advantages for use in automobile starting. For example, low self-discharge, long storage time, high instantaneous starting current, etc. There is a disadvantage in that charging is impossible, for example, below 0 degrees. Charging lithium ion batteries at zero degrees increases the risk of lithium precipitation in the cells. The lithium dendrite is formed mainly because lithium ions are separated from the positive electrode and migrate to the negative electrode in the charging process, dendritic metal lithium is deposited and formed on the surface of the negative electrode, the service life of the lithium battery can be influenced, the risk of lithium precipitation is obviously increased at low temperature, and the lithium dendrite is easier to form on the surface of the negative electrode.

When the lithium battery is used as a starting power supply on an automobile, the lithium battery is affected differently due to the fact that the automobile is in an outdoor environment during running and the outdoor environment temperature is different due to season replacement. Particularly, when the air temperature is low in winter, the air temperature in vast areas such as China, north China, northeast China and the like is often lower than 0 ℃.

In addition, at present, a lead-acid battery is mostly used as a starting power supply, the charging temperature of the lead-acid battery is relatively wide, normal charging can still be carried out under the environment of 0 ℃, and when the lead-acid battery is replaced by a lithium battery to be used as the starting power supply of the automobile, the influence of the low-temperature environment below 0 on the lithium battery is a problem to be considered. Therefore, the charging of the lithium battery is generally stopped below 0 ℃, and the situation of lithium precipitation of the lithium battery is avoided. However, a current sensor (a current sensor is arranged on a cathode pile head of a vehicle) is generally arranged on the automobile and used for monitoring the current of a storage battery and transmitting data to a driving computer, and the automobile displays a battery fault once the monitored current is abnormal

When the bms battery protection board of the battery is in a high-voltage state and is protected to be started or the charging of the lithium battery is stopped below 0 ℃, the battery protection board is equal to that no current exists in a circuit, the detection value of a current sensor is low, a vehicle can consider that a storage battery is damaged, a battery fault lamp is always on, and the battery damage false image can be caused to a vehicle owner.

Disclosure of utility model

The present utility model is directed to a lithium battery system, which solves the technical problems set forth in the background art.

In order to achieve the above purpose, the utility model provides a lithium battery system comprising:

The lithium battery comprises a plurality of lithium battery cells and a support frame, wherein the lithium battery cells are placed on the support frame, and positive and negative electrodes of the lithium battery cells are welded together respectively to form a battery cell positive electrode and a battery cell negative electrode;

the battery cell anode and the battery cell cathode extend out from the upper end of the separator;

the cover plate is positioned above the partition plate, and a positive pole and a negative pole are fixedly arranged on the cover plate;

The super capacitor group is fixed on the partition board, the positive electrode of the super capacitor group is connected with the positive electrode post of the battery, the negative electrode of the super capacitor group is connected with the negative electrode post of the battery, and when the charging of the lithium battery is closed, the super capacitor group can charge and discharge along with the voltage fluctuation of the generator, so that normal charge and discharge current is generated;

And the bms battery protection plate is fixedly arranged on the upper end surface of the partition plate, the cell negative electrode is connected with the cell negative electrode of the bms battery protection plate, and the total negative electrode of the bms battery protection plate is connected with the negative electrode column of the cover plate.

Preferably, the heating control plate is fixed on the partition plate, the positive electrode of the heating control plate is connected with the positive electrode column of the cover plate, and the negative electrode of the heating control plate is connected with the negative electrode column of the cover plate;

the heating sheet is attached to the side face of the lithium battery core;

the first temperature sensor is arranged on the surface of the lithium battery cell and used for monitoring the temperature of the lithium battery cell;

the second temperature sensor is arranged on the heating plate and used for monitoring the temperature of the heating plate;

the normally closed end of the first relay is connected with a charging mos control end bonding pad of the bms battery protection board;

and a normally open end of the relay II is connected with a power supply line of the heating plate.

Preferably, a strong start button is arranged on the cover plate and is connected with a strong start button pad of the bms battery protection plate.

Preferably, an electricity meter is arranged on the cover plate, and the electricity meter is connected with the positive pole and the negative pole of the battery.

Preferably, the support frame comprises a base and side plates, wherein the side plates are fixedly arranged on two sides of the base, and a plurality of lithium battery cells are placed on the base and located between the two side plates.

Preferably, a shell is further arranged on the outer side of the support frame, and the shell wraps the support frame and the lithium battery cells.

Preferably, the super capacitor group is a structure that a plurality of capacitors are connected in series.

Preferably, a capacitor box is arranged on the outer side of the super capacitor group and is fixedly connected with the partition plate.

Preferably, heat preservation cotton is filled between the lithium battery cell shells.

Preferably, the battery pack further comprises a bms battery protection plate fixedly arranged on the upper end face of the partition plate, the battery cell negative electrode is connected with the battery cell negative electrode of the bms battery protection plate, and the total negative electrode of the bms battery protection plate is connected with the negative electrode column of the cover plate.

Compared with the prior art, the utility model has the beneficial effects that:

According to the utility model, a group of super capacitor groups are connected in parallel between the positive binding posts and the negative binding posts on the lithium battery, and the super capacitor groups are charged and discharged along with voltage fluctuation of the generator or during power-off protection of the lithium battery to generate corresponding charging and discharging currents, so that a current sensor of a storage battery of the vehicle can detect normal currents, and no storage battery fault is reported.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a block diagram of a bracket, separator and capacitor of the present utility model;

FIG. 3 is a block diagram of a bracket, separator and capacitor box of the present utility model;

FIG. 4 is a block diagram of a lithium battery cell and a support frame of the present utility model;

FIG. 5 is a block diagram of a support frame of the present utility model;

FIG. 6 is a block diagram of a heating control panel of the present utility model;

fig. 7 is a structural view of the bms battery protection plate of the present utility model;

fig. 8 is a top view of the insulation cotton and housing of the present utility model.

The lithium battery cell is shown as 1, a lithium battery cell, 2, a supporting frame, 21, a base, 22, a side plate, 3, a partition plate, 4, a cover plate, 41, a forced start button, 42, an electric quantity button, 5, a heating plate, 6, a shell, 7, a super capacitor group, 8, a capacitor box, 9 and heat insulation cotton.

Detailed Description

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.

Referring to fig. 1-8, the present embodiment provides a lithium battery system, which includes a plurality of lithium battery cells 1, a support frame 2, and a housing 6, wherein the support frame 2 is located at the outer sides of the lithium battery cells 1, and encapsulates the lithium battery cells in the support frame 2. The anodes of the lithium battery cells 1 are welded together and extend upwards to form a battery cell anode, and the cathodes of the lithium battery cells 1 are welded together and extend upwards to form a battery cell cathode.

In the embodiment, the support frame 2 comprises a base 21, the base 21 is made of aluminum alloy or stainless steel, the strength is high, a better supporting effect can be provided for the lithium battery core 1 due to the fact that the lithium battery core is heavier, the two sides of the base 21 are fixedly provided with side plates 22 through bolts, the bottoms of the side plates 22 are provided with bolt holes, and the support frame and the lithium battery can be fixed on a frame of an automobile together through the bolts. As shown in fig. 2-3, a plurality of lithium battery cells 1 are placed on the base 21 side by side and between the two side plates 22, and the support frame 2 can improve the stability of the lithium battery during installation, ensure more stable installation of the lithium battery, reduce vibration of the lithium battery, and reduce collision to the lithium battery.

The upper sides of the two side plates 22 are also provided with a partition plate 3 through bolts, through holes are formed in the partition plate 3, and a battery cell positive electrode and a battery cell negative electrode of the lithium battery cell 1 extend to the upper side of the partition plate 3 from the through holes, and an installation part is formed on the upper side of the partition plate 3.

The up end of baffle 3 has electric capacity box 8 through bolt fixed mounting, and super capacitor group 7 has been placed to electric capacity box 8's inside, and electric capacity box 8 wraps up super capacitor group 7, protects super capacitor group 7 in its inside, can avoid super capacitor group 7 to receive the collision. In this embodiment, the super capacitor group 7 is a structure in which 6 super capacitors are connected in series. The adopted super capacitor is 16.2V, the capacitance value is 6F-85F, and the number and the capacitance value of the super capacitor can be other types in actual use, and the super capacitor is specifically set according to actual products. The separator 3 separates the lithium battery cell 1 from the super capacitor bank 7, so that the lithium battery cell 1 and the super capacitor bank 7 are positioned in different cavities, and the lithium battery is safer during working.

In this embodiment, the top of baffle 3 still is provided with apron 4, apron 4 utilizes bolt and shell 6 fixed connection together, fixed mounting has positive pole and negative pole post on the apron 4, still be provided with the bms battery protection board between baffle 3 and the apron 4, the up end at baffle 3 is protected to the bms battery protection board fixed mounting, the battery cell positive pole of lithium cell is connected to apron 4 positive pole, the battery cell negative pole of lithium cell is connected the battery cell negative pole end of bms battery protection board, the total negative pole end of bms battery protection board is connected the negative pole post of apron 4. The bms battery protection plate is a prior art and will not be described herein. And the positive pole of the super capacitor group 7 is connected with the positive pole of the cover plate 4, and the negative pole of the super capacitor group 7 is connected with the negative pole of the cover plate 4.

One of the purposes of the applicant to set up the super capacitor bank is to turn off the charging mos tube of the bms battery protection board when the ambient temperature is lower than 0 degree and the heating function is turned on, but due to the short turn-off of the charging function, the vehicle with the accumulator current detection function can report the failure of the accumulator of the vehicle because the accumulator current cannot be monitored. A group of super capacitor sets are connected in parallel between a battery total positive electrode and a battery total negative electrode, and charge and discharge can be carried out on the super capacitor sets along with voltage fluctuation of a generator to generate corresponding charge and discharge current, and at the moment, a storage battery current sensor of a vehicle can detect normal current, so that a battery fault cannot be reported, and the problem that the battery damage fault lamp is reported to the vehicle when no current exists after lithium battery protection is solved.

The applicant also found that when the lithium battery is used under cold conditions, such as in the vast areas of China, north China, northeast China and the like, the temperature is often below 0 ℃ in winter, and the lithium battery can increase the risk of lithium precipitation of a battery core of the lithium battery when the lithium battery is charged below 0 ℃ due to the characteristics of the lithium battery, lithium ions are separated from an anode and migrate to a cathode in the charging process, dendritic metal lithium is deposited and formed on the surface of the cathode, lithium dendrites are formed on the surface of the cathode of the battery, the service life of the battery can be influenced, and natural or explosion of the battery can be caused when the lithium dendrites are too many (if the lithium dendrites penetrate through a diaphragm inside the battery, the positive pole and the negative pole are directly contacted, so that internal short circuit is caused). For example, when a lithium battery is used as a power source for an automobile, an electric automobile, or an electric bicycle, the above problems are caused if the lithium battery is charged in a cold weather. Particularly, when the lithium battery is used as a starting power supply of an automobile, once the engine of the automobile is started, the lithium battery is charged immediately by taking the generator of the automobile to work, and the use risk of the lithium battery on the automobile is very high.

In order to solve the above problem, the heating plates 5 are fixedly installed on the outer sides and bottoms of the lithium battery cells 1, and the heating plates 5 heat the lithium battery cells 1. In this embodiment, the heating plate 5 is connected with the side wall of the lithium battery cell 1 in a gluing manner, and the heating plate 5 wraps the lithium battery cell, so that the heating effect on the lithium battery cell can be improved.

The partition plate 3 is fixedly provided with a heating control plate, the main control of the heating control plate adopts an STM32F103C8T6 singlechip, which is not described in detail in the prior art, the positive electrode of the heating control plate is connected with the positive electrode column of the cover plate 4, the negative electrode of the heating control plate is connected with the negative electrode column of the cover plate 4, the heating control plate is used for controlling the heating work of the heating plates 5, a plurality of heating plates 5 are arranged on the surface of the lithium battery cell, and the specific number of the heating plates is set according to the actual use requirement.

The working temperature of the heating plate 5 is set to be 0 ℃, and when the temperature is lower than 0 ℃, the heating plate 5 is electrified to heat the lithium battery. When the air temperature is lower than 0 ℃, the lithium battery can be heated. As shown in fig. 1, the outer shell 6 is located at the outer side of the supporting frame 2, wraps the lithium battery cell 1 inside, and serves as an outermost protective shell to primarily protect the lithium battery cell. The supporting frame 2 is positioned between the shell 6 and the lithium battery cell 1 and is attached to the lithium battery cell 1, so that the lithium battery cell 1 is protected secondarily. The supporting frame 2 is made of aluminum alloy or stainless steel, so that the strength of the whole battery can be improved. In addition, the heating plate 5 is also positioned between the shell 6 and the lithium battery cell 1 and is in a nearly closed space, so that the heating effect on the lithium battery cell can be improved, and the heat can be prevented from being dissipated outwards.

In a further embodiment, the surface of the heating plate 5 is provided with an NTC temperature sensor I, the NTC temperature sensor I is used for monitoring the temperature of the heating plate 5, the situation that the temperature of the heating plate is too high is avoided, the lithium battery cell 1 is prevented from being provided with an NTC temperature sensor II, and the NTC temperature sensor II is used for monitoring the temperature of the lithium battery cell 1.

In this embodiment, two relays, namely, a first relay and a second relay, are further disposed on the heating control board, and a normally closed end of the first relay of the heating control board is connected with a charging mos control terminal pad on the bms battery protection board, and a normally open end of the second relay is connected with a power supply line of the heating plate 5.

The relay I and the relay II are normally powered on and are not conducted by default, when the fact that the NTC temperature sensor II is lower than or equal to a set temperature value (default 0 ℃ C.) and higher than a set voltage value (default 14V.) is detected, the switch of the relay I and the relay II is conducted, when the NTC temperature sensor II is detected to be higher than the set temperature value (1 ℃ C.), a set delay value is entered, and when the delay time is reached, the switch of the relay I and the relay II is closed, and when the circuit is designed, the delay is set to prevent frequent actions of the relay caused by detection fluctuation, and the delay time can be set according to actual use requirements.

The logic relationship between the relay and the NTC temperature sensor is specifically described below, where the NTC temperature sensor is configured to detect the temperature of the heating plate, close the switch of the relay when the temperature is greater than or equal to a set temperature value (default 80 degrees celsius), and close the switch when the temperature is lower than the set temperature value, and if the condition one is in a state where the switch needs to be opened, if the condition one still reaches the state where the switch is opened, then open the switch, and if the condition one does not reach the state where the switch is opened, then close the switch.

In this embodiment, to prevent thermal runaway of the heater chip, the NTC temperature sensor monitors the heater chip temperature exclusively, and turns off the heater chip power supply when the temperature exceeds a set safe temperature. Meanwhile, each independent heating plate is provided with an independent over-temperature protection switch, so that double protection is realized. In this embodiment, the temperature control switch model is a KSD9700 temperature control switch, and other types of temperature control switches can be selected according to actual use requirements, so long as temperature control can be achieved, and the temperature control is not limited herein.

In this embodiment, when the temperature is below 0 degrees and the voltage is above 14V, the combination logic is to confirm that the ambient temperature is below 0 degrees and that the vehicle generator is operating with current output and the battery is in charge mode. And after the condition is met, the heating control board can open two relay switches, the first relay is a charging mos tube of the normally closed end control protection board, when the first relay is opened, the normally closed end is disconnected, the charging mos tube of the battery protection board is closed, and the battery stops charging. And when the relay II is opened, the normally open end is closed, and the heating plate power supply is electrified to start heating. By adopting the control, the situation that the vehicle cannot be started due to the fact that the battery is insufficient due to the fact that the heating plate is opened in the flameout state of the vehicle can be prevented, the heating plate can be opened only in the high-voltage state after the generator operates, and the heating plate is driven to work by the electricity output by the generator. And meanwhile, the battery charging mos tube is closed, so that the lithium battery is prevented from being damaged and dangerous due to the fact that the lithium battery is charged at a low temperature. That is, when the battery voltage is low (i.e. lower than the set 14V), there is a priority mechanism for starting the vehicle preferentially, and after the vehicle is started, the generator of the vehicle does not charge the lithium battery, the electricity output by the generator is used for heating the heating plate 5, at this time, the charging mos tube of the lithium battery is closed, and the lithium battery is in a non-charging state. The lithium battery can be protected in a low-temperature state, and meanwhile, the normal starting of the automobile can be ensured. When the temperature is higher than the set temperature (0 ℃), the first relay and the second relay are simultaneously closed after time delay, the power supply of the battery heating piece is cut off, the charging mos tube is simultaneously opened, the battery can be normally charged through the generator, and the risk of damage to the lithium battery caused by low-temperature charging is avoided.

The second purpose of setting the super capacitor group is to combine the situation that the lithium battery can not be charged below 0 degree to use, when the lithium battery can not be charged (namely in a protection state), the electricity output by the generator can not enter the storage battery, voltage fluctuation can be generated at the moment, and the vehicle system can report faults because the charging current can not be detected. Therefore, the super capacitor is added at the front end of the protection plate, voltage fluctuation and system faults caused by bms protection can be prevented, when the voltage of the generator falls back to be normal, the charging mos tube can automatically open and conduct charging current, and when the lithium battery is in a low-temperature environment, normal heating operation of the lithium battery can be ensured, and meanwhile, a vehicle system can not report current faults.

The purpose of setting the super capacitor group is that the lithium battery is in order to ensure safety, and the upper limit voltage of charging is strictly controlled. In order to protect the lithium battery from being overcharged, a bms battery protection board is required to be used for controlling the highest voltage, in the individual working condition of the vehicle, the voltage of the generator accidentally exceeds the charging upper limit voltage of the lithium battery, and the bms battery protection board can actively close a charging mos tube to cut off charging current, so that in the protection state, electricity output by the generator cannot enter a storage battery, voltage fluctuation can be generated at the moment, and a vehicle system can report faults because the charging current cannot be detected. Therefore, the super capacitor is added at the front end of the protection plate, voltage fluctuation and system faults generated during bms protection can be prevented, and when the voltage of the generator falls back to be normal, the charging mos tube can automatically open and conduct charging current.

During the protection period, due to the short closing of the charging function, the vehicle with the accumulator current detection function can report the accumulator fault of the vehicle because the accumulator current cannot be monitored. The super capacitor group is connected in parallel between the positive pole and the negative pole of the battery, and can charge and discharge along with voltage fluctuation of the generator to generate corresponding charge and discharge current, and at the moment, the accumulator current sensor of the vehicle can detect normal current, so that the accumulator fault cannot be reported.

In addition, when the lithium battery can not be charged after the charging protection, surge impact when the voltage of the lithium battery is higher than that of the lithium battery can cause the instrument lamp to flash, and the super capacitor bank further has a voltage stabilizing effect. By utilizing the rapid charge and discharge characteristics of the super capacitor, when the super capacitor is combined with a battery, the service life of the battery can be prolonged, the instantaneous pulse power can be enhanced, and the vehicle performance can be improved.

However, when the applicant carries out actual test on the lithium battery, the fact that in summer, due to the fact that sun exposure is carried out, the temperature in the engine compartment of the automobile is too high, heat is transferred into the battery, the over-temperature protection function of the bms battery protection plate is triggered, the bms battery protection plate is in overheat protection closing state, the condition that the storage battery is offline is caused is found, and at the moment, the electric quantity and the electric current temporarily stored in the super capacitor bank can be detected by a computer system of the automobile, and the battery offline fault cannot be warned. In order to avoid triggering the over-temperature protection function due to the problem of heat, the applicant fills a layer of heat insulation cotton 9 between the shell 6 and the lithium battery core 1, as shown in fig. 8, the heat insulation cotton 9 is made of glass fiber or aluminum silicate ceramic fiber, and when the weather in summer is relatively hot, the heat insulation cotton can insulate the external high temperature and avoid heat transfer to the lithium battery. Through experiments of the applicant, although the lithium battery can also spontaneously generate heat in summer, the heat generated by spontaneous heat generation is far less than the temperature of heat transfer after insolation in summer, so that the normal use of the lithium battery is not affected after the heat insulation cotton is added, and the spontaneous heat generation problem of the lithium battery is not worried. And the self-heating of the lithium battery is slow, and the applicant passes the vehicle test continuously for 6-8 hours, so that the temperature of the lithium battery is obviously lower than the temperature of an engine compartment. In addition, when the temperature is cool, the lithium battery heating and heat insulation cotton also has the heat insulation function.

In a further embodiment, a strong start button 41 is further provided on the cover plate 4, and the strong start button 41 is connected to a strong start button pad of the bms battery protection plate. Besides the charge protection function, the lithium battery protection board has a discharge protection function, when the voltage of a battery cell is lower than the lower limit voltage of the lithium ion cell, the protection board can cut off a discharge mos tube, and the cut-off discharge current is used for protecting the cell from transitional discharge.

And the discharging protection function can timely shut down the output current of the battery when the vehicle leaks electricity or is stored for a long time, and when the battery is in a discharging protection on state, the vehicle is not powered by a power supply. Traditional lead-acid batteries require power rescue or battery charging. The lithium battery with the forced starting function only needs to press the forced starting switch button, the protection board can release the discharge protection in a short time (default 1 minute), the discharge mos tube is temporarily opened, the discharge current of the battery is conducted, and the lithium battery is used for starting the vehicle in an emergency. If the vehicle is not started within 1 minute after the strong start button is pressed, the protection board can close the discharging mos tube again, and the battery is switched into a discharging protection working mode for protecting the battery and maintaining the electric quantity of the battery.

The forced starting function in the product can be started by a forced starting button 41 on the battery cover, and can be opened by a mobile phone wireless remote control through Bluetooth connection.

The cover plate 4 is fixedly provided with an ammeter and an electric quantity button 42, the cathode of the ammeter is connected with the cathode column of the battery, the anode of the ammeter is connected with 1 pin of the electric quantity button 42, and 2 pins of the electric quantity button 42 are connected with the anode column (not shown in the figure). Pressing the charge button 42 can be used to display the charge of the lithium battery.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A lithium battery system, comprising:

The lithium battery comprises a plurality of lithium battery cores (1) and a support frame (2), wherein the lithium battery cores (1) are placed on the support frame (2), and positive and negative electrodes of the lithium battery cores (1) are welded together respectively to form a battery core positive electrode and a battery core negative electrode;

The separator (3) is fixed at the top of the support frame (2), and the positive electrode and the negative electrode of the battery cell extend out from the upper end of the separator (3);

the cover plate (4) is positioned above the partition plate (3), and the positive pole and the negative pole are fixedly arranged on the cover plate (4);

The super capacitor group (7) is fixed on the partition board (3), the positive electrode of the super capacitor group (7) is connected with the positive electrode post of the battery, the negative electrode of the super capacitor group is connected with the negative electrode post of the battery, and when the charging of the lithium battery is closed, the super capacitor group can charge and discharge along with the voltage fluctuation of the generator, so that normal charge and discharge current is generated.

2. The lithium battery system according to claim 1, further comprising

The heating control plate is fixed on the partition plate (3), the positive electrode of the heating control plate is connected with the positive electrode column of the cover plate (4), and the negative electrode of the heating control plate is connected with the negative electrode column of the cover plate (4);

the heating sheet (5) is attached to the side surface of the lithium battery core (1);

The first temperature sensor is arranged on the surface of the lithium battery cell (1) and is used for monitoring the temperature of the lithium battery cell (1);

The second temperature sensor is arranged on the heating sheet (5) and is used for monitoring the temperature of the heating sheet (5);

the normally closed end of the first relay is connected with a charging mos control end bonding pad of the bms battery protection board;

and the normally open end of the relay II is connected with a power supply line of the heating sheet (5).

3. The lithium battery system according to claim 2, wherein the cover plate (4) is provided with a strong start button, and the strong start button is connected with a strong start button pad of the bms battery protection plate.

4. A lithium battery system according to claim 2, wherein the cover plate (4) is provided with an electricity meter which is connected with the positive electrode column and the negative electrode column of the battery.

5. A lithium battery system according to claim 3, wherein the support frame (2) comprises a base (21) and side plates (22), the side plates (22) are fixedly arranged on two sides of the base (21), and a plurality of lithium battery cells (1) are placed on the base (21) and are positioned between the two side plates (22).

6. A lithium battery system according to claim 4, wherein the outer side of the support frame (2) is further provided with a housing (6), and the housing (6) wraps the support frame (2) and the plurality of lithium battery cells (1) inside.

7. A lithium battery system according to claim 2, wherein the super capacitor group (7) has a structure in which a plurality of capacitors are connected in series.

8. The lithium battery system according to claim 2, wherein a capacitor box (8) is arranged on the outer side of the super capacitor group (7), and the capacitor box (8) is fixedly connected with the partition plate (3).

9. The lithium battery system of claim 6, wherein heat preservation cotton is further filled between the shells (6) of the lithium battery core (1).

10. The lithium battery system according to claim 1, further comprising a bms battery protection plate fixedly mounted on the upper end surface of the separator (3), wherein the cell negative electrode is connected with the cell negative electrode of the bms battery protection plate, and the total negative electrode of the bms battery protection plate is connected with the negative electrode column of the cover plate (4).