Heater, heating loop, power battery system and vehicle

Abstract

The embodiment of the utility model provides a heater, a heating loop, a power battery system and a vehicle. The heater comprises a heating wire body, and the heating wire body and power supply equipment or a battery pack in the power battery system form the heating loop; the heating wire body comprises a heating part and a fusing part; the heating part and the fusing part are made of the same material or are made of the same wire body, the length of the fusing part is smaller than that of the heating part, the sectional area of the fusing part is smaller than that of the heating part, and the fusing part is heated and fused to block conduction of the heating loop. According to the embodiment of the invention, the fusing part is arranged in the heating wire body of the heater, and the fusing part can play a role in protecting heating fusing, so that overlarge temperature difference and unexpected over-temperature caused by the heater can be avoided, a heating loop can be protected, a fuse does not need to be arranged, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and particularly to a heater, a heating circuit, a power battery system and a vehicle. Background Art

[0002] In some vehicles, a heating circuit with a heater is usually provided, and the battery in the vehicle is heated by the heater. Due to a certain protection mechanism, the shell of the battery is electrified, and a battery insulation film is provided between the heater and the battery. During the operation of the vehicle, the continuous vibration may cause the battery insulation film to be punctured, resulting in the conduction of the heating circuit under non-heating conditions, and the heater continuously heats a certain part of the battery, causing excessive temperature difference and unexpected overheating, thus posing a safety risk to the battery. Summary of the Utility Model

[0003] In view of the above problems, a heater, a heating circuit, a power battery system and a vehicle are provided to overcome or at least partially solve the above problems, including:

[0004] A heater in a heating circuit of a power battery system, the heater includes a heating wire body, and the heating wire body and a power supply device or a battery pack in the power battery system form a heating circuit; the heating wire body includes a heating part and a fusing part;

[0005] The materials of the heating part and the fusing part are the same or are the same wire body. The length of the fusing part is less than the length of the heating part, and the cross-sectional area of the fusing part is less than the cross-sectional area of the heating part. The fusing part is heated and fused to block the conduction of the heating circuit.

[0006] Optionally, the rated current of the fusing part and the heating part is the same, and the fusing current of the fusing part is less than the fusing current of the heating part.

[0007] Optionally, the heating wire body further includes a lead-out part, and one end of the heating wire body is connected to the power supply device or the battery pack through the lead-out part; the fusing part includes a first fusing part arranged near the other end of the lead-out part.

[0008] Optionally, the heating wire body includes sub-heating wire bodies corresponding to the positions of multiple battery cells in the battery pack, and a connecting part is arranged between adjacent two sub-heating wire bodies; the fusing part further includes a second fusing part arranged near one end of the connecting part.

[0009] Optionally, the structure of the fusing part is bent and extended or spirally extended.

[0010] Optionally, the heater is a heating film, and the heating film further includes a heating film substrate, and the heating wire body is arranged on the heating film substrate.

[0011] Optionally, an insulating layer is further provided on the heating film, and the insulating layer is disposed on a side close to the battery cells in the battery pack.

[0012] A heating circuit of a power battery system, the heating circuit including the heater as described above.

[0013] Optionally, a heating relay is further provided in the heating circuit, the heater is connected to the power supply device or the battery pack through the heating relay, and the heating relay is connected to the controller of the battery management system.

[0014] A power battery system, the power battery system including a battery pack and the heating circuit as described above.

[0015] Optionally, the power battery system further includes a pre-charge circuit, and a pre-charge resistor is provided in the pre-charge circuit.

[0016] Optionally, the power battery system further includes a controller of the battery management system.

[0017] A vehicle, the vehicle including the power battery system as described above.

[0018] The embodiments of the present application have the following advantages:

[0019] In the embodiments of the present application, by providing that the heater in the heating circuit of the power battery system includes a heating wire body, the heating wire body forms a heating circuit with the power supply device or the battery pack in the power battery system. The heating wire body includes a heating part and a fusing part. The materials of the heating part and the fusing part are the same or are the same wire body. The length of the fusing part is less than the length of the heating part, and the cross-sectional area of the fusing part is less than the cross-sectional area of the heating part. The fusing part is thermally fused to block the conduction of the heating circuit, realizing that by providing a fusing part in the heating wire body of the heater, the fusing part can play a role in protecting the heating fuse, and further can avoid the heater from causing too large a temperature difference and unexpected overheating and protect the heating circuit, and there is no need to set a fuse anymore, reducing the cost. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the present application, the drawings required for the description of the present application will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic diagram of a heater provided by some embodiments of the present application;

[0022] Figure 2It is a schematic diagram of a power battery system provided by some embodiments of the present application. Detailed implementation manners

[0023] To make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0024] Refer to Figure 1 , which shows a schematic diagram of a heater in a heating circuit of a power battery system provided by some embodiments of the present application. The heater may include a heating wire body 10.

[0025] In some examples, the heating wire body 10 is a bent wire.

[0026] In some examples, the material of the heating wire body may be copper, aluminum, or other heat-generating conductor materials. The heating wire body 10 may be a right-angle bent type or other bent types.

[0027] In some embodiments of the present application, the heater may be a heating film. The heating film may further include a heating film substrate, and the heating wire body 10 is disposed on the heating film substrate.

[0028] In some embodiments of the present application, the heating film may further be provided with an insulating layer. The insulating layer is disposed on one side close to the battery cell 20 in the battery pack of the power battery system. Since the housing of the battery cell 20 is charged, by providing the insulating layer, it is possible to prevent the heating wire body from being short-circuited with the housing of the battery cell 20.

[0029] In some examples, the heating wire body is placed on the upper layer of the heating film substrate, and the insulating layer is disposed on the lower layer of the heating film substrate. The insulating layer is in contact with the battery cell 20 of the battery pack.

[0030] In some embodiments of the present application, the heating wire body 10 and the power supply device or the battery pack in the power battery system form a heating circuit. One end of the heating wire body 10 is connected to the positive electrode of the power supply device or the battery pack in the power battery system, and the other end of the heating wire body 10 is connected to the negative electrode of the power supply device or the battery pack.

[0031] In practical applications, the heating wire body 10 can be directly connected to the battery pack in the power battery system, and thus the battery pack can directly supply power to the heating wire body 10. Alternatively, a separate power supply device can be provided, and the heating wire body 10 is connected to the power supply device, and thus the power supply device supplies power to the heating wire body 10.

[0032] In some embodiments of the present application, the heating wire 10 includes a heating part 11 and a fusing part. The fusing part is heated and fused to block the conduction of the heating circuit, acting as a fuse (insurance) for the heating circuit.

[0033] In practical applications, the materials of the heating part 11 and the fusing part are the same or they are the same wire. That is, the heating part 11 and the fusing part can be spliced by wires with the same material, or they can be different parts of the same wire. The length of the fusing part is less than the length of the heating part 11, and the cross-sectional area of the fusing part is less than the cross-sectional area of the heating part 11, so as to ensure the fusing function of the fusing part.

[0034] In some examples, the cross-sectional area of the fusing part can be 0.2 mm, or it can be set to other values, which can be determined according to the actual situations such as the rated power and cross-sectional area of the heating wire 10.

[0035] In practical applications, only a small part of the heating wire 10 is set as the fusing part, and most of the heating wire 10 still serves as the heating part 11, that is, the length of the fusing part is less than the length of the heating part 11.

[0036] In order to directly implement the fusing function with the heating wire 10, the cross-sectional area of the heating wire 10 to be set as the fusing part can be reduced, so that the fusing part is more easily fused than the heating part 11, realizing the function of using thin lines set by stamping, etching, etc. on the heating wire 10 as the fuse (insurance) of the heating circuit.

[0037] In some embodiments of the present application, the rated current of the fusing part and the heating part 11 is the same, and the fusing current of the fusing part is less than the fusing current of the heating part 11.

[0038] In practical applications, the fusing part is set on the heating wire 10 by means of stamping, etching, etc. The rated current of the fusing part and the heating part 11 is the same, and the rated current of the fusing part and the heating part 11 is the rated current of the heater. The rated current of the heater can be calculated by the following formula:

[0039] I 额定 =U / R+ΔI

[0040] where, I 额定 is the rated current, U is the voltage, R is the resistance, and ΔI is the current error.

[0041] In order to enable some parts of the heating wire 10 to maintain the heating effect and some parts to play the fusing role, the fusing current of the fusing part is less than the fusing current of the heating part 11, that is, the fusing current condition of the fusing part is reached first, and the heating part 11 will not be fused under the action of the rated current or the fusing current of the fusing part.

[0042] In some examples, the rated current can be 10A, the fusing current of the fusing part can be 20A, and the fusing part fuses after the 20A fusing current lasts for 5 seconds.

[0043] It should be noted that on the basis that the cross-sectional area of the fusing part is smaller than that of the heating part 11, the fusing part can be set to a cross-sectional area that can be fused under the calibrated fusing current, and the specific cross-sectional area values are different.

[0044] In some embodiments of the present application, the fusing part and the heating part 11 can have a cross-section in the horizontal direction and a cross-section in the vertical direction. The cross-sectional area in one direction can be set to be different, while the cross-sectional area in the other direction is the same. For example, the cross-sectional area (i.e., width) in the horizontal direction is set to be different, and the cross-sectional area (i.e., thickness) in the vertical direction is the same.

[0045] In practical applications, the fusing part is provided on the heating wire 10 by means of stamping, etching, etc. The thickness of the fusing part and the heating part 11 can be the same, such as 50 microns.

[0046] In some embodiments of the present application, the structure of the fusing part is bent and extended or coiled and extended. For example, the fusing part can be serpentine or trapezoidal, or can be other shapes. By bending and extending or coiling and extending, a plurality of bending parts can be formed, and thus the length of the fusing part can be increased within a limited range.

[0047] In some embodiments of the present application, the heating wire 10 further includes a lead-out part 12. One end of the heating wire 10 is connected to a power supply device or a battery pack through the lead-out part 12, including a positive lead-out part 12 and a negative lead-out part 12. One end of the positive lead-out part 12 is connected to the positive pole of the power supply device or the battery pack, and one end of the negative lead-out part 12 is connected to the negative pole of the power supply device or the battery pack;

[0048] Among them, the fusing part can include a first fusing part 13 provided near the other end of the lead-out part 12, that is, the fusing part is arranged at the entrance or exit of the current entering the heater in the power supply device or the battery pack. The first fusing part 13 can be provided with only one or multiple ones.

[0049] In some embodiments of the present application, the heating wire 10 includes sub-heating wires 10 corresponding to the positions of a plurality of battery cells 20 in the battery pack, and a connecting part 14 is arranged between two adjacent sub-heating wires 10.

[0050] Among them, the fusing part further includes a second fusing part 15 provided near one end of the connecting part 14, that is, a fusing part is arranged at the position of each battery cell 20 of the heating wire 10, and the fusing part is arranged at the entrance or exit of each battery cell 20. The second fusing part 15 can be provided with multiple ones.

[0051] In practical applications, since the heater is disposed on the battery cell 20, the housing of the battery cell 20 is electrified. When a micro short circuit occurs in the heating circuit and the battery, and the provided fusing portion is not within the heating circuit, thus unable to play the role of fusing, multiple second fusing portions 15 can be provided at one end of the connection portion 14 near the connection between two adjacent sub-heating wire bodies 10, that is, multiple insurances are provided, thereby being able to avoid the problem that the fusing portion is not within the heating circuit.

[0052] In the embodiments of the present application, by providing that the heater in the heating circuit of the power battery system includes a heating wire body, the heating wire body is a bent wire, one end of the heating wire body is connected to the positive electrode of the power supply device or the battery pack in the power battery system, the other end of the heating wire body is connected to the negative electrode of the power supply device or the battery pack, the heating wire body includes a heating portion and a fusing portion, the length of the fusing portion is less than the length of the heating portion, and the width of the fusing portion is less than the width of the heating portion, it is achieved that by providing a fusing portion in the heating wire body of the heater, the fusing portion can play a role in protecting the heating and fusing, thereby being able to avoid the heater from causing excessive temperature difference and unexpected overheating and protecting the heating circuit, and there is no need to provide a fuse again, reducing the cost.

[0053] Some embodiments of the present application further provide a heating circuit of a power battery system, the heating circuit includes a heater, the heater includes a heating wire body, and the heating wire body and the power supply device or the battery pack in the power battery system form a heating circuit; the heating wire body includes a heating portion and a fusing portion;

[0054] The heating portion and the fusing portion are made of the same material or are the same wire body, the length of the fusing portion is less than the length of the heating portion, the cross-sectional area of the fusing portion is less than the cross-sectional area of the heating portion, and the fusing portion is heated and fused to block the conduction of the heating circuit.

[0055] In some embodiments of the present application, the rated current of the fusing portion and the heating portion is the same, and the fusing current of the fusing portion is less than the fusing current of the heating portion.

[0056] In some embodiments of the present application, the heating wire body further includes a lead-out portion, and one end of the heating wire body is connected to the power supply device or the battery pack through the lead-out portion; the fusing portion includes a first fusing portion provided near the other end of the lead-out portion.

[0057] In some embodiments of the present application, the heating wire body includes sub-heating wire bodies corresponding to the positions of multiple battery cells in the battery pack, and a connection portion is provided between two adjacent sub-heating wire bodies; the fusing portion further includes a second fusing portion provided near one end of the connection portion.

[0058] In some embodiments of the present application, the structure of the fusing portion is bent and extended or spirally extended.

[0059] In some embodiments of the present application, the heater is a heating film, and the heating film further includes a heating film substrate, and the heating wire body is disposed on the heating film substrate.

[0060] In some embodiments of the present application, the heating film is further provided with an insulating layer, and the insulating layer is disposed on a side close to the battery cells in the battery pack.

[0061] In some embodiments of the present application, the heating circuit may further be provided with a heating relay, and the heating relay may be connected between the heater, the power supply device or the battery pack in the power battery system, for controlling the start of the heater, and the heater may be connected to the power supply device or the battery pack through the heating relay.

[0062] In some embodiments of the present application, the heating relay may be connected to the controller of the Battery Management System (BMS).

[0063] Referring to Figure 2 , a schematic diagram of a power battery system in a vehicle provided by some embodiments of the present application is shown. The power battery system includes a battery pack and a heating circuit as above.

[0064] In some examples, the power battery system is provided with a positive contactor and a negative contactor. The negative electrode of the battery pack is connected to the heater through the negative contactor, and the positive electrode is connected to the heater through the positive contactor.

[0065] In some embodiments of the present application, the power battery system further includes a pre-charge circuit, and the pre-charge circuit can pre-charge the battery pack, and the pre-charge circuit may be provided with a pre-charge resistor.

[0066] In some examples, the pre-charge circuit may further be provided with a pre-charge contactor, and the pre-charge resistor may be connected to the battery pack in the battery system through the pre-charge contactor.

[0067] In some embodiments of the present application, the power battery system further includes a controller of the battery management system. The controller of the battery management system can control the opening or closing of the contactor, can collect information such as the temperature of the battery pack, and can also communicate with the whole vehicle and send corresponding signals.

[0068] In some examples, the power battery system may further be provided with a current detection device, a capacitor, and a load.

[0069] Some embodiments of the present application further provide a vehicle, and the vehicle includes the power battery system as above.

[0070] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data that have been authorized by the user or fully authorized by all parties. Moreover, the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions, and corresponding operation entrances are provided for users to choose to authorize or reject.

[0071] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0072] Those skilled in the art should understand that the embodiments of this application can be provided as a method, a device, or a computer program product. Therefore, the embodiments of this application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the embodiments of this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0073] The embodiments of this application are described with reference to the flowcharts and / or block diagrams of the method, terminal device (system), and computer program product according to the embodiments of this application. It should be understood that each process and / or block in the flowchart and / or block diagram can be realized by computer program instructions, as well as the combination of processes and / or blocks in the flowchart and / or block diagram. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal devices generate a device for realizing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0074] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured product including an instruction device, and the instruction device realizes the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0075] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device, so that a series of operation steps are executed on the computer or other programmable terminal device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable terminal device provide for implementing the process Figure 1 in one process or multiple processes and / or blocks Figure 1 steps for the functions specified in one block or multiple blocks.

[0076] Although the preferred embodiments of the embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present application.

[0077] Finally, it should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device comprising a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or terminal device comprising the above element.

[0078] The above provides a detailed introduction to a heater, a heating circuit, a power battery system and a vehicle. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A heater in a heating circuit of a power battery system, characterized in that: The heater includes a heating wire body, and the heating wire body and the power supply device or the battery pack in the power battery system form a heating circuit; the heating wire body includes a heating part and a fuse part; The heating part and the fuse part are made of the same material or are the same wire, the length of the fuse part is smaller than the length of the heating part, the cross-sectional area of ​​the fuse part is smaller than the cross-sectional area of ​​the heating part, and the fuse part is melted by heat to block the conduction of the heating circuit.

2. The heater according to claim 1, characterized in that The rated currents of the fuse part and the heating part are the same, and the fusing current of the fuse part is smaller than the fusing current of the heating part.

3. The heater according to claim 1 or 2, characterized in that: The heating wire body also includes a lead-out portion, and the heating wire body is connected to the power supply device or the battery pack through one end of the lead-out portion; the fuse portion includes a first fuse portion arranged near the other end of the lead-out portion.

4. The heater according to claim 3, characterized in that The heating wire body includes sub-heating wire bodies corresponding to the positions of multiple battery cells in the battery pack, and a connecting part is arranged between two adjacent sub-heating wire bodies; the fuse part also includes a second fuse part arranged near one end of the connecting part.

5. The heater according to claim 1, characterized in that The fuse portion is configured to extend in a curved manner or in a spiral manner.

6. The heater according to claim 1, characterized in that The heater is a heating film, and the heating film further comprises a heating film substrate, and the heating wire body is arranged on the heating film substrate.

7. The heater according to claim 6, characterized in that The heating film is also provided with an insulating layer, and the insulating layer is arranged on a side close to the battery cells in the battery pack.

8. A heating circuit of a power battery system, characterized in that: The heating circuit comprises a heater as claimed in any one of claims 1 to 7.

9. The heating circuit according to claim 8, characterized in that The heating circuit is further provided with a heating relay, through which the heater is connected to the power supply device or the battery pack, and the heating relay is connected to a controller of a battery management system.

10. A power battery system, characterized in that: The power battery system comprises a battery pack and a heating circuit as claimed in any one of claims 8 to 9.

11. The power battery system according to claim 10, characterized in that: The power battery system further includes a pre-charging circuit, and the pre-charging circuit is provided with a pre-charging resistor.

12. The power battery system according to claim 10, characterized in that: The power battery system also includes a controller of a battery management system.

13. A vehicle, characterized in that: The vehicle comprises a power battery system as claimed in any one of claims 10 to 12.

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