Battery pack heated by electromagnetic eddy current

Abstract

The utility model discloses a battery pack heated by electromagnetic eddy current, and belongs to the technical field of battery heat management. The battery pack comprises a battery cell module, a heating device is arranged below the battery cell module, the heating device comprises a liquid cooling plate and an electromagnetic coil, the liquid cooling plate is attached to the lower portion of the battery cell module, and the electromagnetic coil is fixedly arranged below the liquid cooling plate. According to the utility model, the liquid cooling plate is arranged below the battery cell module, the electromagnetic coil is used for generating the electromagnetic eddy current, and the electromagnetic eddy current can generate heat to heat the liquid cooling plate, so that the battery module above the liquid cooling plate is heated. The eddy current generated by the electromagnetic coil directly acts on the battery cell module, so that the heat transfer time is shortened, and the electromagnetic induction acts on the whole battery cell module, so that a more uniform heating effect can be realized, and the problem of local overheating or insufficient heating is avoided; the heating rate of the electromagnetic eddy current is high, the temperature of the battery pack can be rapidly increased in a short time, and the problems that an existing battery pack is low in heating efficiency and high in energy consumption are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery thermal management, and particularly relates to a battery pack with electromagnetic eddy current heating. Background Art

[0002] With the rapid development of the electric vehicle market, the heating technology of battery packs has become an important research direction. The heating method of the battery pack directly affects the performance and service life of the battery. Therefore, it is crucial to select an efficient and safe heating method for the battery pack.

[0003] Currently, the main heating methods of battery packs include resistance wire heating, hot air heating, and liquid heating, etc. Resistance wire heating is a method of heating the battery pack by generating heat through a resistance wire. The resistance wire is installed inside or outside the battery pack. When an electric current passes through, the resistance wire generates heat, thereby heating the battery pack. Hot air heating heats the battery pack by blowing hot air. The hot air is usually generated by an external heater and then transported to the vicinity of the battery pack through a pipeline. Liquid heating is a method of heating the battery pack by circulating a heated liquid. A liquid such as water or a special coolant is heated externally and then pumped into the cooling channels of the battery pack through a pump, thereby transferring heat to the battery.

[0004] Although these methods can achieve the heating of the battery pack, there are problems such as low heating efficiency, high heating energy consumption, and uneven heating. Summary of the Utility Model

[0005] The utility model provides a battery pack with electromagnetic eddy current heating, which solves the problems of low efficiency, high energy consumption, and uneven heating of the existing battery heating methods.

[0006] To solve the above technical problems, the utility model provides a battery pack with electromagnetic eddy current heating, including: a battery cell module;

[0007] A heating device is arranged below the battery cell module;

[0008] The heating device includes a liquid cooling plate and an electromagnetic coil;

[0009] The liquid cooling plate is attached to the lower side of the battery cell module, and the electromagnetic coil is fixedly arranged below the liquid cooling plate.

[0010] Preferably, the battery cell module includes battery cells and a battery management module. The battery cells are electrically connected to the battery management module. A through hole is formed on one side of the liquid cooling plate close to the battery management module. The battery management module is electrically connected to the electromagnetic coil through a wire passing through the through hole.

[0011] Preferably, a buffer device is arranged below the electromagnetic coil.

[0012] Preferably, the buffer device is a foam board.

[0013] Preferably, the foam board is provided with positioning grooves, and the electromagnetic coil is embedded in the positioning grooves.

[0014] Preferably, the electromagnetic coil is in a disc shape or a spiral shape.

[0015] Preferably, an upper cover is provided above the battery cell module.

[0016] Preferably, the liquid cooling plate is an aluminum part.

[0017] The advantages of the present utility model at least include:

[0018] By arranging the liquid cooling plate below the battery cell module and using the electromagnetic coil to generate electromagnetic eddy currents, the electromagnetic eddy currents will generate heat to heat the liquid cooling plate, thereby heating the battery module above the liquid cooling plate. By directly applying the eddy currents generated by the electromagnetic coil to the battery cell module, the time of heat transfer is reduced, and because the electromagnetic induction acts on the entire battery cell module, a more uniform heating effect can be achieved, avoiding problems of local overheating or insufficient heating; the heating rate of the electromagnetic eddy currents is fast, and the temperature of the battery pack can be rapidly increased within a short time, solving the problems of low heating efficiency and high energy consumption of the existing battery pack. Description of the Drawings

[0019] Figure 1 It is a structural diagram of the battery pack according to an embodiment of the present utility model;

[0020] Figure 2 It is a schematic diagram of the principle of electromagnetic eddy current heating in an embodiment of the present utility model;

[0021] Figure 3 It is a schematic diagram of the control strategy of the battery management module in an embodiment of the present utility model;

[0022] Figure 4 It is a structural diagram of the buffer device in an embodiment of the present utility model.

[0023] In the figure: 1 - battery cell module; 11 - battery cell; 12 - battery management module; 2 - liquid cooling plate; 21 - through hole; 3 - electromagnetic coil; 4 - foam board; 41 - positioning groove; 5 - upper cover. Detailed Embodiments

[0024] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] As Figure 1 shown, an embodiment of the present utility model provides a battery pack with electromagnetic eddy current heating, including: a battery cell module 1, a liquid cooling plate 2, and an electromagnetic coil 3. The liquid cooling plate 2 is attached to the lower side of the battery cell module 1, and the electromagnetic coil 3 is fixedly arranged under the liquid cooling plate 2.

[0026] According to the principle of electromagnetic induction, when a conductive material is exposed to a changing magnetic field, the change in the magnetic field will cause current flow inside the conductor, and these currents are eddy currents. Like all currents, eddy currents will also generate heat due to the resistive heating effect. As Figure 2 shown, when an alternating current is passed through the electromagnetic coil 3, the electromagnetic coil 3 will generate an alternating magnetic field around it. This alternating magnetic field will be transmitted to the battery cell module 1 through the liquid cooling plate 2, and eddy currents will be generated inside the conductive material in the battery cell module 1, thereby realizing the heating of the battery cell module 1.

[0027] By directly heating the battery cell module 1 through the electromagnetic eddy current heating technology, the heat transfer link in the traditional heating method is omitted, thereby greatly reducing the time and steps required for heating. And the heating method using electromagnetic induction can generate a uniform heating effect within the entire battery cell module 1, effectively preventing overheating or insufficient heating in local areas, and ensuring the stability and consistency of battery performance.

[0028] Compared with resistance wire heating, electromagnetic heating can quickly heat an object to the required temperature, improving production efficiency. And since the energy is directly transferred to the object during electromagnetic heating without the need for a heating medium, the energy utilization rate is relatively high.

[0029] Compared with hot air heating, the heat is directly generated inside the object to be heated during electromagnetic heating, so more uniform heating is provided, while there may be uneven heat distribution in hot air heating. And electromagnetic heating does not require medium conduction, so the heating speed is fast, while hot air heating relies on hot air as the medium and the heating speed is relatively slow.

[0030] Compared with liquid heating, electromagnetic heating has higher controllability and can achieve precise temperature control, while the temperature control of a liquid heating system may be affected by factors such as liquid flow rate and flow. And electromagnetic heating does not require the circulation of a medium, and the heating structure required for the device is less, which can reduce the space occupied by the heating device and energy consumption.

[0031] Specifically, the battery cell module 1 includes a plurality of battery cells 11 and a battery management module 12. The battery cells 11 are electrically connected to the battery management module 12. A through hole 21 is formed on one side of the liquid cooling plate 2 close to the battery management module 12, and the battery management module 12 is electrically connected to the electromagnetic coil 3 through a wire passing through the through hole 21.

[0032] AsFigure 3 The figure shows a schematic diagram of the control strategy of the battery management module according to an embodiment of the present invention. The temperature data of the battery cell 11 is sourced from temperature sensors arranged on the top cover or the tab of the battery cell 11 within the battery pack. The judgment conditions for starting and stopping battery heating are the minimum temperature and the average temperature of the battery cell 11. As the temperature of the battery cell 11 rises, the thermal conductivity coefficient of the battery management module 12 changes. Therefore, it is possible to judge whether it is necessary to adjust the energy of the electromagnetic eddy current according to the current temperature rise rate to obtain a higher temperature rise rate.

[0033] The battery management module 12 first judges the temperature of the battery cell 11. If the minimum temperature of the battery cell 11 is less than 0°C, the average temperature is less than 3°C, and the current in the electromagnetic coil 3 is 0 A, then the battery management module 12 will set the current in the electromagnetic coil 3 to 5 A and the alternating frequency to 50 Hz to start the heating mode.

[0034] If the minimum temperature of the battery cell 11 is less than 0°C, the average temperature is less than 3°C, but the current in the electromagnetic coil 3 is not 0 A, then it is judged that the heating mode has been started at this time.

[0035] After starting the heating mode, if the temperature rise rate of the battery cell 11 is greater than 0.5°C / min, the battery management module 12 will judge whether the minimum temperature of the battery cell 11 is greater than or equal to 5°C and whether the average temperature of the battery cell 11 is greater than or equal to 7°C. If so, the heating mode will be ended; if not, the current mode will be maintained until the minimum temperature of the battery cell 11 is greater than or equal to 5°C and the average temperature is greater than or equal to 7°C.

[0036] If the temperature rise rate of the battery cell 11 is less than 0.5°C / min in the heating mode, the battery management module 12 will increase the current in the electromagnetic coil 3 to 10 A and raise the alternating frequency to 60 Hz to accelerate the heating speed until the minimum temperature of the battery cell 11 is greater than or equal to 5°C and the average temperature is greater than or equal to 7°C.

[0037] By this method, the battery management module 12 can dynamically adjust the heating strategy according to the temperature of the battery cell 11 and the temperature rise rate of the battery pack to ensure that the battery pack can be appropriately heated under different temperature conditions, while avoiding overheating or unnecessary energy consumption.

[0038] The design of the through hole 21 allows the battery management module 12 and the electromagnetic coil 3 to be directly connected inside the battery pack, which can reduce the need for external wiring, simplify the wiring layout inside the battery pack, save space, reduce wiring complexity, and contribute to a more compact battery pack design.

[0039] Specifically, a buffer device is provided below the electromagnetic coil 3.

[0040] The buffer device can absorb and disperse the energy generated by vibration or impact, protect the electromagnetic coil 3 and the battery cell module 1 from damage, and at the same time prevent the electromagnetic coil 3 from displacing or deforming inside the battery pack, ensuring the uniformity and reliability of the heating effect.

[0041] Specifically, the buffer device is a foam board 4.

[0042] As an insulating material, the foam board 4 can reduce the heat conduction between the electromagnetic coil 3 and the battery cell module 1, contributing to maintaining the temperature balance inside the battery pack. At the same time, the foam board 4 has a light weight and will not significantly increase the overall weight of the battery pack, helping to maintain the lightweight design of the battery pack. And the foam board 4 can be cut into different shapes and sizes as needed to adapt to the specific layout and design requirements inside the battery pack.

[0043] Specifically, a positioning groove 41 is provided on the foam board 4, and the electromagnetic coil 3 is embedded in the positioning groove 41.

[0044] As Figure 4 shown, by embedding the electromagnetic coil 3 into the positioning groove 41 of the foam board 4, space can be saved, making the entire heating system more compact, which is beneficial to the lightweight and space layout optimization of the battery pack. And the design of the positioning groove 41 can make the electromagnetic coil 3 more evenly distributed under the liquid cooling plate 2, contributing to the uniform heating of the battery cell module 1 and avoiding local overheating or insufficient heating. At the same time, the close contact between the electromagnetic coil 3 and the liquid cooling plate 2 can improve the heat transfer efficiency because the eddy current generated by the electromagnetic coil 3 directly acts on the liquid cooling plate 2, reducing the heat loss during the heat transfer process.

[0045] Specifically, the electromagnetic coil 3 is in a disc shape or a spiral shape.

[0046] Because the distribution of the electromagnetic field is relatively uniform within the disc range, the disc-shaped design helps to provide a more uniform heating effect. And the spiral-shaped coil can generate a stronger local magnetic field, contributing to concentrating the heating on a specific area and improving the heating efficiency. Whether the electromagnetic coil 3 is in a disc shape or a spiral shape, the electromagnetic coil 3 can efficiently convert electrical energy into heat energy for heating the battery pack.

[0047] Specifically, an upper cover 5 is provided above the battery cell module 1.

[0048] The upper cover 5 can provide physical protection for the battery cell module 1, preventing external objects from hitting or damaging the battery cells 11. At the same time, the upper cover 5 helps to seal the battery pack, preventing moisture, dust and other contaminants from entering, and improving the reliability and durability of the battery pack.

[0049] Specifically, the liquid cooling plate 2 is made of aluminum.

[0050] Aluminum has the characteristics of high thermal conductivity, corrosion resistance, and moderate coefficient of thermal expansion. Therefore, the liquid cooling plate 2 can quickly transfer heat to the battery cell module 1, thereby improving the heating efficiency, and can maintain its performance in various environments, extending the service life of the liquid cooling plate 2. Also, because the coefficient of thermal expansion of aluminum is moderate, the liquid cooling plate 2 can maintain the stability of its size when the temperature changes, reducing the stress caused by thermal expansion and contraction.

[0051] In traditional liquid heating, there is a temperature difference of 3 - 5 °C between the inlet and outlet of the liquid cooling plate, which will cause the temperature difference between the battery cells of the battery pack to be between 5 - 10 °C. During eddy current heating, the entire metal liquid cooling plate is a uniform thermal temperature field, and the heating power for each battery cell in the battery pack is the same, and the temperature difference between each battery cell can be controlled within 2 °C.

[0052] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. Only the preferred embodiments of the present invention are expressed. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. As long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0053] It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A battery pack heated by electromagnetic eddy current, characterized in that: include: Battery cell module (1); A heating device is provided below the battery core module (1); The heating device comprises a liquid cooling plate (2) and an electromagnetic coil (3); The liquid cooling plate (2) is attached to the bottom of the battery core module (1), and the electromagnetic coil (3) is fixedly arranged below the liquid cooling plate (2).

2. The electromagnetic eddy current heated battery pack according to claim 1, characterized in that: The battery cell module (1) comprises a battery cell (11) and a battery management module (12); the battery cell (11) is electrically connected to the battery management module (12); a through hole (21) is provided on a side of the liquid cooling plate (2) close to the battery management module (12); and the battery management module (12) is electrically connected to the electromagnetic coil (3) via a wire passing through the through hole (21).

3. The electromagnetic eddy current heated battery pack according to claim 1, characterized in that: A buffer device is arranged below the electromagnetic coil (3).

4. The electromagnetic eddy current heated battery pack according to claim 3, characterized in that: The buffer device is a foam board (4).

5. The electromagnetic eddy current heated battery pack according to claim 4, characterized in that: The foam plate (4) is provided with a positioning groove (41), and the electromagnetic coil (3) is embedded in the positioning groove (41).

6. The electromagnetic eddy current heated battery pack according to claim 1, characterized in that: The electromagnetic coil (3) is in the shape of a disk or a spiral.

7. The electromagnetic eddy current heated battery pack according to claim 1, characterized in that: An upper cover (5) is provided above the battery core module (1).

8. The electromagnetic eddy current heated battery pack according to claim 1, characterized in that: The liquid cooling plate (2) is an aluminum part.

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