CN216818439U

CN216818439U - Battery top cap capable of monitoring running state of lithium ion battery

Info

Publication number: CN216818439U
Application number: CN202220459703.0U
Authority: CN
Inventors: 代德明; 周雷军; 卜相楠; 熊才艺
Original assignee: Chuneng New Energy Co Ltd
Current assignee: Chuneng New Energy Co Ltd
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2022-06-24
Anticipated expiration: 2032-03-04

Abstract

The utility model provides a battery top cover capable of monitoring the running state of a lithium ion battery, which comprises a cover plate; the device also comprises a two-pole unit, an isolation assembly and a monitoring unit; two first clamping grooves are formed in the two ends of the cover plate in the length extending direction; the two first clamping grooves extend along the thickness direction of the cover plate; a first through hole which is communicated with the center of each first clamping groove is formed in the center of each first clamping groove; the isolation component is arranged on one side end face of the cover plate and is fixedly connected with the cover plate; the isolation component is provided with two through holes which are communicated; two second clamping grooves are formed in the end face, far away from the cover plate, of the isolating assembly; the two second clamping grooves are opposite and arranged at intervals; each pole column unit sequentially penetrates through the second through hole and the first through hole and extends outwards from the cover plate; the pole unit is connected with the cover plate in a sealing way; the monitoring unit is abutted against the surface of the core cladding adjacent to the pole unit; the monitoring unit acquires a temperature signal or a pressure signal of the core package and wirelessly transmits the temperature signal or the pressure signal.

Description

Battery top cap capable of monitoring running state of lithium ion battery

Technical Field

The utility model relates to the technical field of lithium ion battery operation monitoring equipment, in particular to a battery top cover capable of monitoring the operation state of a lithium ion battery.

Background

Lithium ion batteries, for short lithium batteries, are batteries using a nonaqueous electrolyte and a lithium alloy metal oxide as a positive electrode material and graphite as a negative electrode material. The lithium battery has the characteristics of convenience in carrying, stable and reliable performance, reasonable structure and the like, and is widely applied to the field of direct-current charging and discharging. At present, the lithium ion battery is widely applied to the fields of intelligent equipment, electric automobiles, electric tools, aerospace and the like. For electric vehicles, the most important energy storage device is the battery.

During the use of lithium ion batteries, the temperature and pressure conditions of the batteries need to be monitored. The existing scheme is that the temperature and the pressure of the surface of a lithium battery with a metal shell are monitored, and acquired temperature and pressure signals are sent to a BMS or an automobile central control; however, the temperature and pressure conditions obtained in the mode are not the actual temperature or pressure inside the battery, and a cable transmission mode is adopted, so that a wiring link is added, and precious space in the vehicle is occupied. In view of the above, it would be desirable to provide a compact battery top cover that monitors the temperature or pressure within a lithium ion battery.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a battery top cap which has a compact structure and can monitor the internal operation state of a lithium ion battery without additional wiring.

The technical scheme of the utility model is realized as follows: the utility model provides a battery top cover capable of monitoring the running state of a lithium ion battery, which comprises a cover plate (1), two-pole column units (2), an isolation assembly (3) and a monitoring unit (4); the two pole units (2) are arranged on the cover plate (1) in a penetrating way and are connected with the cover plate in a sealing way;

the isolation component (3) is arranged on one side end face of the cover plate (1); the isolation component (3) is fixedly and hermetically connected with the cover plate (1); two second through holes (31) are formed in the isolation component (3); the two second through holes (31) are arranged at intervals along the length extension direction of the isolation component (3); the two pole units (2) are arranged in a second through hole (31) in a penetrating way and extend towards the cover plate (1);

the monitoring unit (4) is fixedly arranged at one end, far away from the cover plate (1), of the isolation assembly (3), and the monitoring unit (4) is also abutted against the surface of the core cladding adjacent to the pole unit (2); the monitoring unit (4) acquires a temperature signal or a pressure signal of the core package and wirelessly transmits the temperature signal or the pressure signal.

On the basis of the technical scheme, preferably, the pole unit (2) comprises a pole lug adapter plate (21), a pole plate (22), a pole plate limiting ring (23), a first sealing assembly (24) and a second sealing assembly (25);

two ends of the cover plate (1) in the length extension direction are provided with two first clamping grooves (11); the two first clamping grooves (11) extend along the thickness direction of the cover plate (1); a first through hole (12) which is through is arranged at the center of each first clamping groove (11); the first through hole (12) is communicated with the adjacent second through hole (31) on the isolation component (3);

two second clamping grooves (32) are formed in the end face, far away from the cover plate (1), of the isolation assembly (3), and the two-pole column units (2) are embedded in the second clamping grooves (32) respectively; the pole lug adapter plate (21) is embedded in a second clamping groove (32) of the isolation assembly (3), a protruding part (100) is arranged on the pole lug adapter plate (21), and the protruding part (100) sequentially penetrates through the second through hole (31) and the first through hole (12) and extends into the first clamping groove (11); the end part of the protruding part (100) far away from the pole lug adapter plate (21) is provided with a pole plate (22), and the protruding part (100) is electrically connected with the pole plate (22); the polar plate limiting ring (23) is embedded in the first clamping groove (11) and arranged around the polar plate (22); the first sealing assembly (24) is coated along the axial extension direction of the pole plate limiting ring (23) and is fixedly arranged on the inner surface and the outer surface of the pole plate limiting ring (23), and the surface of the first sealing assembly (24) is abutted against the side surface of the first clamping groove (11) or the axial extension direction of the pole plate (22); the second sealing component (25) is arranged around the protrusion part (100), and the second sealing component (25) is connected with the second through hole (31) or the first through hole (12) in a sealing mode.

Preferably, the protrusion part (100) and the pole plate (22) are arranged at intervals, a conductive connecting part (26) is further arranged between the protrusion part (100) and the pole plate (22), and the conductive connecting part (26) is abutted to the protrusion part (100) and the pole plate (22); the protruding part (100), the conductive connecting part (26) and the electrode plate (22) are electrically connected in sequence.

Further preferably, the isolation assembly (3), the first sealing assembly (24) and the second sealing assembly (25) are all made of insulating materials.

On the basis of the technical scheme, preferably, a third clamping groove (13) is arranged on the cover plate (1) between the two first clamping grooves (11), a pressure relief valve plate (14) is embedded in the third clamping groove (13), and a plurality of centrosymmetric notches are arranged on the pressure relief valve plate (14); a plurality of through air holes (33) are arranged at the position of the isolation component (3) opposite to the pressure relief valve plate (14).

On the basis of the technical scheme, preferably, the monitoring unit (4) comprises a processor (41), a temperature detection circuit (42), a pressure detection circuit (43) and a wireless transmission circuit (44);

the processor (41), the temperature detection circuit (42), the pressure detection circuit (43) and the wireless transmission circuit (44) are all arranged in a second clamping groove (32) at one end, far away from the cover plate (1), of the isolation assembly (3);

the output end of the temperature detection circuit (42) is electrically connected with the processor (41); the temperature detection circuit (42) detects the surface temperature of the core pack adjacent to the pole unit (2) and outputs a temperature detection signal to the processor (41);

the output end of the pressure detection circuit (43) is electrically connected with the processor (41); the pressure detection circuit (43) detects air pressure corresponding to core bag aerogenesis adjacent to the pole unit (2) and outputs an air pressure detection signal to the processor (41);

a wireless transmission circuit (44) communicatively coupled to the processor (41); the wireless transmission circuit (44) wirelessly transmits the temperature detection signal and the air pressure detection signal received by the processor (41).

Preferably, the temperature detection circuit (42) includes a temperature detection chip U2; the processor (41) is provided with a plurality of data communication interfaces and a universal input and output interface; pin 3 of the temperature detection chip U2 is electrically connected with the +5V power supply; pin 1 of the temperature detection chip U2 is grounded; pin 2 of the temperature detecting chip U2 is electrically connected to one end of the resistor R1 as an output terminal of the temperature detecting circuit (42), and the other end of the resistor R1 is electrically connected to a general input/output interface of the processor (41).

Further preferably, the pressure detection circuit (43) includes a pressure detection chip U3; the pin 1 and the pin 2 of the pressure detection chip U3 are both electrically connected with a +3.3V power supply; the pin 7 and the pin 8 of the pressure detection chip U3 are respectively and electrically connected with one data communication interface of the processor (41) in a one-to-one correspondence manner, the pin 7 and the pin 8 of the pressure detection chip U3 are also electrically connected with one end of a pull-up resistor, and the other end of the pull-up resistor is electrically connected with a +3.3V power supply.

Preferably, the wireless transmission circuit (44) comprises a WIFI module U4, a reset switch S1 and a reset switch S2; pin 1 of the WIFI module U4 is electrically connected to pin 2 of the reset switch S1 and one end of the resistor R4, respectively, and pin 1 of the reset switch S1 is grounded; pin 3 of the WIFI module U4 is electrically connected to one end of the resistor R5, and the other ends of the resistor R4 and the resistor R5 are both electrically connected to the +3.3V power supply; pin 15 and pin 16 of WIFI module U4 are both grounded; pin 18 of the WIFI module U4 is electrically connected to pin 1 of the reset switch S2, and pin 2 of the reset switch S2 is grounded;

pins

21 and 22 of the WIFI module U4 are electrically connected to a data communication interface of the processor (41) in a one-to-one correspondence manner.

Preferably, the monitoring device also comprises a hollow packaging part (34), and the monitoring unit (4) is arranged in the packaging part (34); the end face of the packaging part (34) is provided with a plurality of openings, and the detection part of the temperature detection circuit (42) or the detection part of the pressure detection circuit (43) is respectively embedded at the openings.

Compared with the prior art, the battery top cover capable of monitoring the running state of the lithium ion battery has the following beneficial effects:

(1) according to the scheme, the monitoring unit is arranged on one side, close to the interior of the battery, of the cover plate, the two pole column units and the isolation assembly which are compact and sealed, so that the temperature or the pressure of a core package on one side of the cover plate is monitored in real time, and more real and accurate battery running state parameters are provided;

(2) the multi-stage sealing structure of the pole unit is beneficial to maintaining the airtight environment inside the battery and preventing the contact between the inside of the battery and the external environment;

(3) due to the fact that a wireless data transmission mode is adopted, the working power supply is obtained from the pole unit, the monitoring unit does not need to additionally arrange complicated wiring, and circuit layout is simplified.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a perspective view of a battery top cap capable of monitoring the operation state of a lithium ion battery according to the present invention;

FIG. 2 is a top view of a battery top cap for monitoring the operating status of a lithium ion battery according to the present invention;

FIG. 3 is a front view, partially in cross-section, of a battery top cover for monitoring the operating status of a lithium ion battery according to the present invention;

FIG. 4 is a perspective view of a battery top cap according to the present invention, illustrating an exploded view of the battery top cap;

FIG. 5 is a bottom view of a battery top cap for monitoring the operating status of a lithium ion battery according to the present invention;

FIG. 6 is a block diagram of a monitoring unit of a battery top cover capable of monitoring the operation status of a lithium ion battery according to the present invention;

FIG. 7 is a wiring diagram of a temperature detection circuit of a battery top cover capable of monitoring the operation state of a lithium ion battery according to the present invention;

FIG. 8 is a wiring diagram of a pressure detection circuit of a battery top cover capable of monitoring the operation state of a lithium ion battery according to the present invention;

fig. 9 is a wiring diagram of a wireless transmission circuit of a battery top cover capable of monitoring the operation state of a lithium ion battery according to the present invention.

Description of reference numerals: 1. a cover plate; 2. a pole unit; 3. an isolation component; 4. a monitoring unit; 11. a first card slot; 12. a first through hole; 13. a third card slot; 14. a pressure relief valve plate; 100. a protrusion portion; 21. a tab adaptor plate; 22. a polar plate; 23. a polar plate limiting ring; 24. a first seal assembly; 25. a second seal assembly; 26. a conductive connection portion; 31. a second through hole; 32. a second card slot; 33. air holes are formed; 34. a packaging section; 41. a processor; 42. a temperature detection circuit; 43. a pressure detection circuit; 44. a wireless transmission circuit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention, belong to the protection scope of the present invention.

The utility model provides a battery top cover capable of monitoring the operation state of a lithium ion battery, which is shown in fig. 1-5 and comprises a cover plate 1, a two-pole column unit 2, an isolation assembly 3, a monitoring unit 4 and the like;

the cover plate 1 is used for leading out the positive and negative electrodes of the core package in the battery and sealing the battery shell. The pole unit 2 is used for leading out and forming the positive and negative poles of the battery. The two-pole column unit 2 is penetrated on the cover plate 1 and is connected with the cover plate in a sealing way. Specifically, two first clamping grooves 11 are arranged at two ends of the cover plate 1 in the length extension direction; the two first clamping grooves 11 extend along the thickness direction of the cover plate 1; a first through hole 12 is arranged at the center of each first clamping groove 11; the first slot 11 and the first through hole 12 thereof are used for limiting and sealing the pole column unit 2.

The isolation component 3 is arranged on one side end face of the cover plate 1, and the isolation component 3 is fixedly connected with the cover plate 1; the isolation component 3 is provided with two through holes 31; the two second through holes 31 are arranged at intervals along the length extending direction of the isolation component 3; and the first through hole 12 on the cover plate 1 is communicated with the adjacent second through hole 31 on the isolation component 3; two second clamping grooves 32 are formed in the end face, away from the cover plate 1, of the isolating component 3; the two second slots 32 are opposite and spaced; the second card slot 32 communicates with the adjacent second through hole 31. Isolation component 3 is used for separating utmost point post unit 2 and apron 1, plays the effect of injecing utmost point post unit 2's gesture, can also play insulating effect, prevents that the inside electrolyte of battery from leaking. The second clamping groove, the second through hole and the first through hole jointly act to limit the specific position of the pole unit 2.

The two pole units 2 are respectively embedded in the two second clamping grooves 32, and each pole unit 2 sequentially passes through the second through hole 31 and the first through hole 12 and extends out of the cover plate 1; the pole unit 2 is hermetically connected with the cover plate 1; the first through-hole 12 and the second through-hole 31 communicate the inside and the outside of the battery so that a portion of the pole unit 2 can be drawn out from the inside of the battery case.

The monitoring unit 4 is fixedly arranged at one end of the isolation component 3, which is far away from the cover plate 1, and the monitoring unit 4 is also abutted against the surface of the core cladding adjacent to the pole unit 2; the monitoring unit 4 acquires a temperature signal or a pressure signal of the core pack and wirelessly transmits the temperature signal or the pressure signal. The monitoring unit 4 is arranged at one side close to the core package in the isolation assembly 3, the temperature of the surface of the core package and the pressure of gas generated in the battery can be directly obtained, the information of the running state of the lithium ion battery is transmitted in a wireless mode in time, and the transmitted terminal is a battery management system BMS or a vehicle-mounted central control system.

As shown in fig. 1 to 5, a specific composition structure of the pole unit 2 is shown. The pole unit 2 is used as a positive or negative connection end of the extracted core package. Each pole unit 2 comprises a pole lug adapter plate 21, a pole plate 22, a pole plate limiting ring 23, a first sealing assembly 24 and a second sealing assembly 25; the pole lug adapter plate 21 is embedded in the second clamping groove 32 of the isolation assembly 3, the pole lug adapter plate 21 is provided with a protruding part 100, and the protruding part 100 sequentially penetrates through the second through hole 31 and the first through hole 12 and extends into the first clamping groove 11; the end part of the protruding part 100 far away from the pole lug adapter plate 21 is provided with a pole plate 22, and the protruding part 100 is electrically connected with the pole plate 22; the polar plate limiting ring 23 is embedded in the first clamping groove 11 and arranged around the polar plate 22; the first sealing assembly 24 is wrapped along the axial extension direction of the pole plate limiting ring 23 and is fixedly arranged on the inner surface and the outer surface of the pole plate limiting ring 23, and the surface of the first sealing assembly 24 is abutted against the side surface of the first clamping groove 11 or the axial extension direction of the pole plate 22; the second sealing member 25 is disposed around the protrusion 100, and the second sealing member 25 is sealingly connected to the second through-hole 31 or the first through-hole 12. As can be seen from the figure, the tab adaptor plate 21 is connected to the positive tab or the negative tab on the core package, and extends out of the isolation assembly 3 to be further connected to the cover plate 1 and the external terminal. The illustrated tab adaptor plate 21 has a plate-shaped body with a large enough contact area to be electrically connected to one or more tabs of the core package. The protrusion 100 of the tab transition plate 21 is extended out of the battery through the second through hole 31 and the first through hole 12, and the illustrated protrusion 100 is provided perpendicular to the end of the tab transition plate 21. A gap is formed between the second through hole 31 or the first through hole 12 and the protrusion 100, and the gap is sealed by the second sealing member 25 while passing through the second through hole 31 in order to prevent leakage of the internal electrolyte or the like. In addition, in order to press the pole plate 22 to the end of the protruding part 100 far away from the pole lug adapter plate 21, a structure of a pole plate limiting ring 23 is adopted, a stepped groove is arranged in the axial direction of the pole plate 22 in the figure, the diameter of a circular ring in the middle of the pole plate limiting ring 23 is abutted against the root part of the stepped groove, the pole plate limiting ring 23 is further abutted against the first clamping groove 11, and the length of the pole plate 22 extending out of the pole plate limiting ring 23 is limited. This case has a high accuracy requirement on the plate stopper ring 23, and if there is a gap between the plate stopper ring 23 and the first engaging groove 11 or the plate 22, the sealing state of the battery may be affected. Therefore, a first sealing assembly 24 is further added, the first sealing assembly 24 is tightly coated between the outer surface of the pole plate limiting ring 23 and the first clamping groove 11, the end part of the pole plate limiting ring 23 far away from the cover plate 1 and between the inner surface of the pole plate limiting ring 23 and the outer surface of the pole plate 22, interference fit between the first clamping groove 11 or the pole plate 22 is realized, and a double sealing effect is achieved. In order to prevent the first sealing component 24 from sliding off, the inner surface of the first clamping groove 11 is further provided with an annular channel, so that the bonding strength between the first sealing component 24 and the first clamping groove 11 is increased. In order to achieve the insulation effect, the isolation assembly 3, the first sealing assembly 24 and the second sealing assembly 25 are made of insulation materials. Further preferably, the first seal assembly 24 may be formed from a PPS material.

A conductive connection part 26 can be further arranged between the protrusion part 100 and the polar plate 22, and the conductive connection part 26 is abutted against the protrusion part 100 and the polar plate 22; the protrusion 100, the conductive connection 26, and the electrode plate 22 are electrically connected in sequence. The conductive connection part 26 can be adapted to a gap which may exist between the protrusion part 100 and the pole plate 22, and when the tab adaptor plate 21 of the pole unit 2 serving as a negative electrode is made of copper, transition can be performed between the conductive connection part 26 and the pole plate 22, so that while reliable conductivity is ensured, the amount of copper material used for the protrusion part 100 and the processing difficulty are reduced.

A third clamping groove 13 is formed in the cover plate 1 between the two first clamping grooves 11, a pressure relief valve plate 14 is embedded in the third clamping groove 13, and a plurality of centrosymmetric nicks are formed in the pressure relief valve plate 14; the isolation component 3 is provided with a plurality of through air holes 33 at the position opposite to the pressure relief valve plate 14. When the internal of the battery is thermally out of control, the generated excessive gas can be accumulated between the cover plate 1 and the isolation assembly 3 through the vent hole 33, and the pressure relief valve plate 14 is jacked up for pressure relief treatment.

In order to better and directly acquire the actual operation state of the battery inside the battery, such as temperature or pressure conditions. As shown in fig. 6 to 9, the monitoring unit 4 includes a processor 41, a temperature detection circuit 42, a pressure detection circuit 43, and a wireless transmission circuit 44; the processor 41, the temperature detection circuit 42, the pressure detection circuit 43 and the wireless transmission circuit 44 are all arranged in the second card slot 32 at one end of the isolation component 3 far away from the cover plate 1;

the output end of the temperature detection circuit 42 is electrically connected with the processor 41; the temperature detection circuit 42 detects the surface temperature of the core pack adjacent to the pole unit 2 and outputs a temperature detection signal to the processor 41;

the output end of the pressure detection circuit 43 is electrically connected with the processor 41; the pressure detection circuit 43 detects the air pressure corresponding to the core wrap gas generation adjacent to the pole unit 2 and outputs an air pressure detection signal to the processor 41;

the wireless transmission circuit 44 is in communication connection with the processor 41; the wireless transmission circuit 44 wirelessly transmits the temperature detection signal and the air pressure detection signal received by the processor 41.

Specifically, as shown in fig. 7-9, the diagram shows the wiring diagram of a specific monitoring unit 4:

the temperature detection circuit 42 includes a temperature detection chip U2; the processor 41 has a plurality of data communication interfaces and a general input/output interface; pin 3 of the temperature detection chip U2 is electrically connected with the +5V power supply; pin 1 of the temperature detection chip U2 is grounded; pin 2 of the temperature detecting chip U2 is electrically connected to one end of the resistor R1 as an output terminal of the temperature detecting circuit 42, and the other end of the resistor R1 is electrically connected to a general-purpose input/output interface of the processor 41. The temperature detection chip U2 is DS18B20 chip. The processor 41, i.e. the illustrated U1, may be implemented by a STM32F103 series single chip microcomputer of the semiconductor family, or a similar product of the company TI or the company ATMEL, to implement corresponding functions.

The pressure detection circuit 43 includes a pressure detection chip U3; the pin 1 and the pin 2 of the pressure detection chip U3 are both electrically connected with a +3.3V power supply; the pin 7 and the pin 8 of the pressure detection chip U3 are electrically connected to one data communication interface of the processor 41, respectively, the pin 7 and the pin 8 of the pressure detection chip U3 are also electrically connected to one end of a pull-up resistor, and the other end of the pull-up resistor is electrically connected to a +3.3V power supply. The pressure detection chip U3 is selected from MS5611 pressure sensor.

The wireless transmission circuit 44 comprises a WIFI module U4, a reset switch S1 and a reset switch S2; pin 1 of the WIFI module U4 is electrically connected to pin 2 of the reset switch S1 and one end of the resistor R4, respectively, and pin 1 of the reset switch S1 is grounded; pin 3 of the WIFI module U4 is electrically connected to one end of the resistor R5, and the other ends of the resistor R4 and the resistor R5 are both electrically connected to the +3.3V power supply; pin 15 and pin 16 of WIFI module U4 are both grounded; pin 18 of the WIFI module U4 is electrically connected to pin 1 of the reset switch S2, and pin 2 of the reset switch S2 is grounded; pins 21 and 22 of the WIFI module U4 are electrically connected to a data communication interface of the processor 41 one by one. The WIFI module U4 selects an ESP8266 chip, the WIFI module U4 can be reset by pressing the reset switch S1, and the working mode of the WIFI module U4 can be switched by pressing the reset switch S2, for example, the sending mode is changed into the receiving mode or the firmware upgrading mode. The WIFI module U4 has a pair of TTL-compatible UART ports, which are electrically connected to the serial UART interfaces corresponding to the

pins

42 and 43 of the processor 41.

In order to better fix the actual position of the monitoring unit 4, the present invention further comprises a hollow enclosure 34, the monitoring unit 4 is disposed in the enclosure 34; the end face of the sealing part 34 is provided with a plurality of openings, and the detection part of the temperature detection circuit 42 or the detection part of the pressure detection circuit 43 are respectively embedded at different openings. The packaging portion 34 can keep the monitoring unit 4 at a certain distance from each pole unit 2, and define a sampling area of the monitoring unit 4. The encapsulation portion can prevent a short circuit caused by contact of the circuit portion of the monitoring unit 4 with the electrolyte, and plays a certain role in protecting and supporting the monitoring unit 4.

The chip used in the present invention is easy to obtain, and a corresponding technical manual can be obtained at the same time of obtaining the chip, and the present invention does not relate to improvement in procedures.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A battery top cover capable of monitoring the running state of a lithium ion battery comprises a cover plate (1) and two-pole column units (2), wherein the two-pole column units (2) penetrate through the cover plate (1) and are in sealing connection with the cover plate; the method is characterized in that: the device also comprises an isolation assembly (3) and a monitoring unit (4);

2. The battery top cover capable of monitoring the operation state of the lithium ion battery as claimed in claim 1, wherein: the pole unit (2) comprises a pole lug adapter plate (21), a pole plate (22), a pole plate limiting ring (23), a first sealing assembly (24) and a second sealing assembly (25);

3. The battery top cover capable of monitoring the operation state of the lithium ion battery as claimed in claim 2, wherein: the protruding part (100) and the polar plate (22) are arranged at intervals, a conductive connecting part (26) is further arranged between the protruding part (100) and the polar plate (22), and the conductive connecting part (26) is abutted to the protruding part (100) and the polar plate (22); the protruding part (100), the conductive connecting part (26) and the electrode plate (22) are electrically connected in sequence.

4. A battery top cap capable of monitoring the operating status of a lithium ion battery according to claim 3, wherein: the isolation assembly (3), the first sealing assembly (24) and the second sealing assembly (25) are all made of insulating materials.

5. The battery top cover capable of monitoring the operation state of the lithium ion battery as claimed in claim 2, wherein: a third clamping groove (13) is formed in the cover plate (1) between the two first clamping grooves (11), a pressure relief valve plate (14) is embedded in the third clamping groove (13), and a plurality of centrosymmetric notches are formed in the pressure relief valve plate (14); a plurality of through air holes (33) are arranged at the position of the isolation component (3) opposite to the pressure relief valve plate (14).

6. A battery top cover capable of monitoring the operation state of a lithium ion battery according to any one of claims 1 to 5, wherein: the monitoring unit (4) comprises a processor (41), a temperature detection circuit (42), a pressure detection circuit (43) and a wireless transmission circuit (44);

7. The battery top cover capable of monitoring the operation state of the lithium ion battery as claimed in claim 6, wherein: the temperature detection circuit (42) comprises a temperature detection chip U2; the processor (41) is provided with a plurality of data communication interfaces and a universal input and output interface; pin 3 of the temperature detection chip U2 is electrically connected with the +5V power supply; pin 1 of the temperature detection chip U2 is grounded; pin 2 of the temperature detection chip U2 is electrically connected to one end of the resistor R1 as an output terminal of the temperature detection circuit (42), and the other end of the resistor R1 is electrically connected to a general-purpose input/output interface of the processor (41).

8. The battery top cover capable of monitoring the operation state of the lithium ion battery as claimed in claim 7, wherein: the pressure detection circuit (43) comprises a pressure detection chip U3; the pin 1 and the pin 2 of the pressure detection chip U3 are both electrically connected with a +3.3V power supply; the pin 7 and the pin 8 of the pressure detection chip U3 are respectively and electrically connected with one data communication interface of the processor (41) in a one-to-one correspondence manner, the pin 7 and the pin 8 of the pressure detection chip U3 are also electrically connected with one end of a pull-up resistor, and the other end of the pull-up resistor is electrically connected with a +3.3V power supply.

9. The battery top cover capable of monitoring the operation state of the lithium ion battery as claimed in claim 7, wherein: the wireless transmission circuit (44) comprises a WIFI module U4, a reset switch S1 and a reset switch S2; pin 1 of the WIFI 4 is electrically connected to pin 2 of the reset switch S1 and one end of the resistor R4, respectively, and pin 1 of the reset switch S1 is grounded; pin 3 of the WIFI module U4 is electrically connected to one end of the resistor R5, and the other ends of the resistor R4 and the resistor R5 are both electrically connected to the +3.3V power supply; pin 15 and pin 16 of WIFI module U4 are both grounded; pin 18 of the WIFI module U4 is electrically connected to pin 1 of the reset switch S2, and pin 2 of the reset switch S2 is grounded; pins 21 and 22 of the WIFI module U4 are electrically connected to a data communication interface of the processor (41) in a one-to-one correspondence manner.

10. The battery top cover capable of monitoring the operation state of the lithium ion battery as claimed in claim 6, wherein: the monitoring device also comprises a hollow packaging part (34), and the monitoring unit (4) is arranged in the packaging part (34); the end face of the packaging part (34) is provided with a plurality of openings, and the detection part of the temperature detection circuit (42) or the detection part of the pressure detection circuit (43) is respectively embedded at the openings.