CN210350044U

CN210350044U - Power battery heating system and car

Info

Publication number: CN210350044U
Application number: CN201921662346.2U
Authority: CN
Inventors: 李焕明
Original assignee: Beijing Electric Vehicle Co Ltd
Current assignee: Beijing Electric Vehicle Co Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-04-17
Anticipated expiration: 2029-09-30

Abstract

The utility model discloses a power battery heating system and car, the system includes: the heating module is connected between the positive electrode and the negative electrode of the heating power supply; the switch control module is connected with the heating module; the heating module comprises at least one zone heating unit connected in parallel, and each zone heating unit comprises: the solid-state relay and the heating resistor are connected in series; the switch control module is connected with the solid-state relay. The utility model discloses a power battery heating system is a plurality of parallelly connected subregion heating unit with the heating module design to carry out power control through solid state relay and on-off control module to the heating unit, realized carrying out nimble independent heating control to the different regions among the power battery and heating power is adjustable, improved power battery's heating efficiency.

Description

Power battery heating system and car

Technical Field

The utility model relates to the technical field of automobiles, especially, relate to a power battery heating system and car.

Background

The thermal management of the power battery is an important technical problem of new energy automobiles, and the heating control of the power battery is also a main research hotspot.

At present, in a heating system of a power battery, the existing heating system mainly uses a resistance wire of a resistor with a fixed resistance value and a mechanical relay switch for heating control, and only has two states of a switch, so that the power can not be flexibly adjusted. However, for the battery pack with irregular shape design, the heating requirements of different areas are greatly different (for example, the heating requirements of the front area and the rear area are different due to the height of different areas of the battery pack). The prior art cannot execute flexible and independent heating control for different areas of the battery pack, resulting in low heating efficiency.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a power battery heating system and car has solved the technique and can not be directed against the different regions of battery package and carry out nimble independent heating control, leads to the problem that heating efficiency is low.

According to the utility model discloses an aspect provides a power battery heating system, include:

the heating module is connected between the positive electrode and the negative electrode of the heating power supply;

the switch control module is connected with the heating module;

the heating module comprises at least one zone heating unit connected in parallel, and each zone heating unit comprises: the solid-state relay and the heating resistor are connected in series;

the switch control module is connected with the solid-state relay.

Optionally, the zone heating unit further comprises: an overcurrent protection subunit;

and one end of the overcurrent protection subunit is connected with the positive electrode of the heating power supply, and the other end of the overcurrent protection subunit is connected with the solid-state relay.

Optionally, the overcurrent protection subunit includes: and a fuse.

Optionally, the switch control module includes: at least one duty cycle switching signal generator.

Optionally, the system further includes: the emergency shutdown control device comprises a mechanical relay and an emergency shutdown control module connected with the mechanical relay;

one end of the mechanical relay is connected with the heating module, and the other end of the mechanical relay is connected with the negative electrode of the heating power supply.

Optionally, the system further includes: the state diagnosis module is connected between the mechanical relay and the negative electrode of the heating power supply;

and the output end of the state diagnosis module is connected with the input end of the emergency shutdown control module.

Optionally, the status diagnosis module includes:

first resistance the first resistance is connected in series between the mechanical relay and the negative pole of the heating power supply;

the non-inverting input end and the inverting input end of the amplifier are respectively and electrically connected with two ends of the first resistor;

and voltage signals at two ends of the first resistor are amplified by the amplifier and then input to the emergency shutdown control module.

Optionally, the system further includes:

and the output end of the processing module is connected with the emergency shutdown control module.

Optionally, the processing module includes:

the analog-to-digital converter is connected with the output end of the amplifier;

the isolator is connected with the analog-to-digital converter;

and the output end of the phase inverter is connected with the emergency shutdown control module.

According to another aspect of the present invention, there is provided an automobile comprising the power battery heating system as described above.

The utility model discloses a beneficial effect of embodiment is:

in the scheme, the heating module is designed into the plurality of the partition heating units which are connected in parallel, and the solid relays in the partition heating units are subjected to power control through the switch control module, so that flexible and independent heating control is performed on different areas in the power battery, the heating power is adjustable, and the heating efficiency of the power battery is improved.

Drawings

Fig. 1 shows one of the schematic structural diagrams of a power battery heating system according to an embodiment of the present invention;

fig. 2 shows a second schematic structural diagram of a power battery heating system according to an embodiment of the present invention;

fig. 3 shows a third schematic structural diagram of a power battery heating system according to an embodiment of the present invention;

fig. 4 shows a fourth schematic structural diagram of a power battery heating system according to an embodiment of the present invention;

fig. 5 shows a fifth schematic structural diagram of a power battery heating system according to an embodiment of the present invention.

Description of reference numerals:

1. heating module, 2, switch control module, 3, emergency shutdown control module, 4, state diagnosis module, 5, processing module, 6, mechanical relay.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

As shown in fig. 1, an embodiment of the present invention provides a power battery heating system, including:

the heating module 1 is connected between the anode and the cathode of the heating power supply;

the switch control module 2 is connected with the heating module 1;

the heating module 1 comprises at least one zone heating unit 11 connected in parallel, each zone heating unit comprising: the solid-state relay and the heating resistor are connected in series;

the switch control module 2 is connected with the solid-state relay; the heating resistor is connected with the negative electrode of the heating power supply, and the solid-state relay is connected with the positive electrode of the heating power supply.

In this embodiment, the heating module 1 shown in fig. 1 is connected between the positive pole V + and the negative pole V-of the heating power supply and comprises three parallel-connected zone heating units 11, each zone heating unit 11 representing a different heating zone. Among them, the relay used in each zone-heating unit 11 is a solid-state relay (S1, S2, S3 in fig. 1). The solid-state relay has no defect of easy damage when frequently switching, and can be switched at extremely high speed (above KH level). The switch control module 2 connected to the solid-state relay controls the solid-state relay in each heating element 11 through different duty ratio switching signals, so as to realize high-speed switching of the heating resistor (R1, R2, R3 in fig. 1), so that the power of the heating resistor is flexibly increased and decreased, the requirements of heating power in different states are met, and the heating power of each heating element 11 is adjustable. In addition, the solid-state relay has the advantage of almost unlimited service life, and the reliability and the service life of the system are improved. In conclusion, the scheme can meet different partition heating requirements of the battery pack with an irregular shape (such as a right drawing, the height and the difference of the heating requirements of the front area and the rear area are great), and the heating setting with independent multi-partition power is realized by controlling a plurality of heating partitions by using different switching frequencies, so that the heating efficiency is improved. Particularly, if the power of the external power supply is insufficient and is not enough to drive a plurality of heating partitions at the same time, a switching signal with a minimum duty ratio can be used, so that the technical effect of greatly reducing the power consumption of all the partitions to realize the simultaneous heating of the plurality of partitions is achieved.

The switch control module 2 includes: and the at least one duty cycle switching signal generator is used for outputting a duty cycle switching signal so as to control the opening and closing of the solid-state relay.

As shown in fig. 2, in an optional embodiment of the present invention, because the overcurrent capacity of the solid-state relay is poor, the partition heating unit 11 further includes: overcurrent protection subunits (F1, F2, F3 in fig. 2); and one end of the overcurrent protection subunit is connected with the positive electrode of the heating power supply, and the other end of the overcurrent protection subunit is connected with the solid-state relay. The overcurrent protection subunit is used for overcurrent protection. Specifically, the overcurrent protection subunit includes: fuses or fuse tubes, etc.

As shown in fig. 3, in an optional embodiment of the present invention, the system further includes: a mechanical relay 6 and an emergency shutdown control module 3 connected to the mechanical relay 6; one end of the mechanical relay 6 is connected with the heating module 1, and the other end of the mechanical relay is connected with the negative electrode of the heating power supply.

In this embodiment, by additionally providing the mechanical relay 6, when each zone heating unit 11 has a fault, for example, when the solid-state relay breaks down, and the short-circuit current of the resistance part is too large, the mechanical relay 6 is controlled to be turned off by the emergency turn-off control module 3, so that the technical effect of cutting off the whole heating system in an emergency manner is achieved, and safety is ensured. When the heating system works normally (the whole system does not have a fault), the mechanical relay 6 is closed earlier than the heating module 1 and is switched off later than the heating module 1, so that electric arcs are not generated, the service life is not consumed, and the technical effect that the mechanical relay 6 is strictly protected is realized. In addition, the mechanical relay 6 in the embodiment is used as a protection device, does not participate in opening and closing, almost no loss occurs in service life, and the heating system is turned off only in an emergency when the solid-state relay fails, so that the problem that the heating function is easy to fail due to the fact that the mechanical relay is easy to damage is solved.

As shown in fig. 4, in an optional embodiment of the present invention, the system further includes: a state diagnosis module 4 connected between the mechanical relay 6 and a negative electrode of the heating power supply;

the output end of the state diagnosis module 4 is connected with the input end of the emergency shutdown control module 3. In this embodiment, the output signal of the status diagnosis module 4 is used as the basis for the judgment of the emergency shutdown control module 3, and when there is a fault, the emergency shutdown of the entire heating system is performed by the mechanical relay 6. Here, the emergency shutdown control module 3 may be a controller, such as a single chip microcomputer, for monitoring and determining the state. It can be understood that the switch control module 2 and the emergency shutdown control module 3 can be integrated into one controller, and the same technical effect can be achieved.

In an alternative embodiment, as shown in fig. 5, the status diagnostic module 4 comprises: a first resistor r connected in series between the mechanical relay 6 and the negative electrode of the heating power supply;

the non-inverting input end and the inverting input end of the amplifier are respectively and electrically connected with two ends of the first resistor r;

and voltage signals at two ends of the first resistor r are amplified by the amplifier and then input to the emergency shutdown control module.

In this embodiment, the first resistor r with the extremely small resistance is connected in series to the heating circuit, so that when a current passes through the heating circuit, the extremely small voltage V generated by the first resistor r is amplified by the amplifier and then is input to the emergency shutdown control module 3, so that a state signal (the extremely small voltage V) is fed back to the emergency shutdown control module 3, and the emergency shutdown control module 3 performs state monitoring and determination through the extremely small voltage V.

The realization principle of the state diagnosis is as follows: when the heating system works normally, the voltage difference V ≠ 0 should be generated at two ends of the first resistor r; when the heating system does not work, the voltage difference V between the two ends of the first resistor r is not 0, which is the signal input of the emergency shutdown control module 3. In the absence of a fault, the mechanical relay 6 is closed and V is not equal to 0. If there is a failure, V becomes 0, and the mechanical relay 6 is turned off.

As shown in fig. 5, in an alternative embodiment of the present invention, on the basis of the heating module 1, the mechanical relay 6, the emergency shutdown control module 3, and the status diagnosis module 4, the system further includes: and the processing module 5 is connected with the output end of the amplifier, and the output end of the processing module 5 is connected with the emergency shutdown control module 3. After the voltage signal V at the two ends of the first resistor r is amplified by the amplifier, the interference signal is processed by the processing module 5, so as to meet the requirement of high-voltage power utilization and improve the accuracy of state diagnosis.

Further, as shown in fig. 5, the processing module 5 includes: the analog-to-digital converter ADC is connected with the output end of the amplifier; the isolator is connected with the analog-to-digital converter (ADC); and the output end of the phase inverter is connected with the emergency shutdown control module 3. In this embodiment, the processing module 5 performs analog-to-digital conversion, high-voltage and low-voltage isolation and logic detection on the voltage signals at the two ends of the first resistor r, and the output signals are used for the emergency shutdown control module 3 to perform state judgment, so that it can be understood that the processing module 5 can also be integrated into the emergency shutdown control module 3, and the same technical effect can be achieved.

The utility model also provides an automobile, include as above power battery heating system.

According to the scheme, the battery pack heating device realizes flexible heating control of different heating zones of the battery pack through the plurality of zone heating units connected in parallel. The solid-state relay is used in each zone heating unit to realize the switching function of a high-speed electrical system, the mechanical relay 6 is used for emergency protection, and in a normal state, the mechanical relay 6 is strictly protected and does not participate in load cut-off, so that the whole system circuit can be directly cut off, and weak leakage current generated when the solid-state relay does not work can be cut off. Further, a minimum resistor (a first resistor r) is connected in series for signal input of system monitoring and heating system state monitoring; the processing module comprises the design of analog-to-digital conversion, isolation, logic detection and the like, and meets the high-voltage safety requirement. The scheme greatly optimizes the heat management capability of the existing power battery, improves flexibility and safety, and finally embodies better practicability and safety of the new energy automobile.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

The foregoing is directed to the preferred embodiments of the present invention, and it will be understood by those skilled in the art that various changes and modifications may be made without departing from the principles of the invention, and that such changes and modifications are intended to be included within the scope of the invention.

Claims

1. A power cell heating system, comprising:

a heating module (1) connected between the positive electrode and the negative electrode of the heating power supply;

a switch control module (2) connected with the heating module (1);

the heating module (1) comprises at least one zone heating unit (11) connected in parallel, each zone heating unit comprising: the solid-state relay and the heating resistor are connected in series;

the switch control module (2) is connected with the solid-state relay.

2. The power cell heating system according to claim 1, wherein the zone heating unit (11) further comprises: an overcurrent protection subunit;

3. The power battery heating system of claim 2, wherein the over-current protection subunit comprises: and a fuse.

4. The power cell heating system according to claim 1, wherein the switch control module (2) comprises: at least one duty cycle switching signal generator.

5. The power cell heating system according to claim 1 or 2, further comprising: the emergency shutdown control device comprises a mechanical relay (6) and an emergency shutdown control module (3) connected with the mechanical relay (6);

one end of the mechanical relay (6) is connected with the heating module (1), and the other end of the mechanical relay is connected with the negative electrode of the heating power supply.

6. The power cell heating system of claim 5, further comprising: a state diagnosis module (4) connected between the mechanical relay (6) and the negative electrode of the heating power supply;

the output end of the state diagnosis module (4) is connected with the input end of the emergency shutdown control module (3).

7. The power cell heating system according to claim 6, wherein the status diagnostic module (4) comprises:

a first resistor (r) connected in series between the mechanical relay (6) and the negative pole of the heating power supply;

the amplifier is connected with the first resistor (r), and a non-inverting input end and an inverting input end of the amplifier are respectively and electrically connected with two ends of the first resistor (r);

and voltage signals at two ends of the first resistor (r) are amplified by the amplifier and then input to the emergency shutdown control module (3).

8. The power cell heating system of claim 7, further comprising:

and the output end of the processing module is connected with the emergency shutdown control module (3).

9. The power cell heating system according to claim 8, wherein the processing module (5) comprises:

the isolator is connected with the analog-to-digital converter;

and the output end of the inverter is connected with the emergency shutdown control module (3).

10. A vehicle comprising a power cell heating system according to any one of claims 1 to 9.