Rapid heating system for battery

Abstract

The utility model relates to a rapid heating system for a battery, which comprises an IGBT (Insulated Gate Bipolar Translator) module for controlling the battery to circularly charge and discharge so as to increase the temperature inside the battery; and the battery external heating system is positioned outside the battery and is used for increasing the temperature outside the battery. According to the utility model, the purpose of simultaneously heating the inside and the outside of the battery is realized through the IGBT module and the battery external heating system.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy electric vehicles, and in particular to a rapid heating system for batteries. Background Art

[0002] Whether it is a lithium phosphate battery or a ternary lithium ion battery, in a low temperature environment, it will be affected by the reduced activity of the positive and negative electrode materials and the reduced conductivity of the electrolyte. From the results, the charging time will increase accordingly, and it will be more difficult to fully charge. During use, the power lithium battery pack will lose power significantly faster. Therefore, in order to solve the above problems, engineers have developed a battery preheating system and a thermal management system. By adjusting the temperature of the battery pack, the impact of the ambient temperature on its appearance is reduced. At present, most battery pack preheating methods use external heating of the battery cell, which has low heating efficiency and slow heating speed, which seriously affects the charging speed of new energy vehicles in extremely cold areas. Commonly used heating solutions include polyimide heating film, silicone heating pad, PTC heating plate and liquid heating solution. The pain points of these solutions are as follows: polyimide heating film and silicone heating pad are low in cost and suitable for naturally cooled battery systems, which affects the heat dissipation performance of the battery system and accelerates the attenuation of the battery system; PTC heating plate is easy to install, but has a large size and weight, and the volume utilization and energy density of the thermal conductive battery system are reduced; the liquid heating solution can be combined with the liquid cooling system, which is beneficial to the life of the battery system, but the whole vehicle needs to add a heater and a liquid working fluid circulation system, which is costly.

[0003] Patent application number: 202122515037.6, application date is 2021.10.19, the utility model name is an electric vehicle battery heating device, which relates to the field of battery protection technology, including a temperature sensing module and a heating unit, and also including a temperature acquisition unit, a comparison unit and a module selection unit. The temperature sensing module is signal-connected to the temperature acquisition unit, and the output end of the temperature acquisition unit is connected to the comparison unit. The comparison unit is connected to a reference voltage, and the output end of the comparison unit is connected to the input end of the module selection unit. The output end of the module selection unit is connected to the input end of the heating unit. The heating unit includes a liquid heating module and a PTC direct heating module. Through this device, the battery heating method can be reasonably adjusted according to the battery temperature. When the temperature is low, PTC is used for rapid heating, and when a certain threshold is reached, it is converted to liquid heating. When the car is powered off, due to the large specific heat capacity of water and its strong ability to store heat, it can slowly cool down to ensure battery performance.

[0004] In the above-mentioned prior art, the battery heating method adopts PTC external heating, which is large in size and weight, and the volume utilization rate and energy density of the thermal conductive battery system are reduced. In addition, the inside of the battery is not heated, and the heating efficiency is not high. Utility Model Content

[0005] In view of the defect that the prior art can only heat the outside of the battery but not the inside of the battery, the purpose of the utility model is to provide a rapid heating system for the battery.

[0006] The technical solution provided by the utility model is:

[0007] A rapid heating system for a battery comprises an IGBT module, which is used to control the battery's cyclic charge and discharge, and also comprises a battery external heating system, which is located outside the battery and is used to increase the battery's external temperature.

[0008] Preferably, it also includes an energy storage capacitor; under the control of the IGBT module, the battery discharges the energy storage capacitor or the energy storage capacitor charges the battery.

[0009] Preferably, the circuit connects the battery and the energy storage capacitor in sequence; the circuit is provided with a first on-off switch and a second on-off switch; the first on-off switch and the second on-off switch are connected in parallel and in series with the energy storage capacitor; the IGBT module is used to control the alternating closing and opening of the first on-off switch and the second on-off switch.

[0010] Preferably, when the IGBT module controls the first on / off switching on / off, the battery discharges the energy storage capacitor; and when the IGBT module controls the second on / off switching on / off, the energy storage capacitor charges the battery.

[0011] Preferably, the circuit is also connected to a liquid heating system, which is located between the battery and the energy storage capacitor, and can achieve continuous operation of the liquid heating system through discharge of the battery or the energy storage capacitor; the battery external heating system is connected to the liquid heating system.

[0012] Preferably, the circuit is further connected with a boost module, and the boost module is located between the energy storage capacitor and the liquid heating system; the boost module is connected in series with the second on-off switch and then in parallel with the first on-off switch.

[0013] Preferably, the liquid heating system comprises a liquid heating body and a liquid heating element located inside the liquid heating body; liquid working medium is filled between the liquid heating body and the liquid heating element.

[0014] Preferably, the battery external heating system comprises a liquid heating plate and a liquid pipeline arranged outside the battery; both ends of the liquid pipeline are respectively connected to the liquid heating plate and the liquid heating body, so that the liquid working medium circulates in the liquid heating plate and the liquid heating body.

[0015] Preferably, the liquid pipeline comprises at least one liquid inlet pipeline and one liquid outlet pipeline.

[0016] Preferably, the battery external heating system further comprises a liquid circulation pump, and the liquid circulation pump is used to circulate the liquid working medium in the liquid heating plate through a liquid inlet pipeline and a liquid outlet pipeline.

[0017] Preferably, the battery outer box is sleeved on the outside of the battery and the liquid heating plate to protect the battery and the liquid heating plate.

[0018] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0019] The utility model controls the alternating closing and opening of the first on-off switch and the second on-off switch through the IGBT module, and realizes the short-time high-current discharge of the battery and the discharge of the energy storage capacitor through the circuit, thereby making the battery cyclically charged and discharged, so as to achieve the purpose of heating the internal part of the battery.

[0020] In addition, the current generated by the battery's cyclic charge and discharge enables the liquid heating system to work continuously, and the purpose of external heating of the battery is achieved through the circulation of liquid working fluid between the battery's external heating system and the liquid heating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a rapid heating system for a battery in one embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of a liquid heating system and local liquid pipelines in one embodiment of the present application.

[0023] Explanation of the symbols in the schematic diagram:

[0024] Battery 1, IGBT module 2, first on-off switch 21, second on-off switch 22, boost module 23; energy storage capacitor 3; liquid heating body 41, liquid heating element 42, liquid working medium 43; liquid heating plate 51, liquid inlet pipeline 52, liquid outlet pipeline 53, liquid circulation pump 54; battery outer box 6; circuit 7. DETAILED DESCRIPTION

[0025] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the drawings and embodiments.

[0026] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of implementation. The change or adjustment of their relative relationship should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0027] The present application discloses a rapid heating system for a battery, comprising a battery 1, an IGBT module 2 (Insulated Gate Bipolar Transistor), an energy storage capacitor 3, and a liquid heating system. The liquid heating system is located between the battery 1 and the energy storage capacitor 3, and a circuit 7 sequentially connects the battery 1, the liquid heating system, and the energy storage capacitor 3. In addition, a first on-off switch 21, a second on-off switch 22, and a boost module 23 are provided on the circuit 7. The second on-off switch 22 is connected in series with the boost module 23 and then connected in parallel with the first on-off switch 21.

[0028] IGBT module 2 is an insulated gate bipolar transistor, a semiconductor device, and IGBT module 2 is used to control the alternating closing and opening of the first on-off switch 21 and the second on-off switch 22. When the first on-off switch 21 is closed, the formed electrical circuit causes the battery 1 to discharge the energy storage capacitor 3, and the discharge rate of the battery 1 is between 0.1C and 100C; when the second on-off switch 22 is closed, another electrical circuit is formed, and the battery 1 stops discharging. At this time, the voltage stored in the energy storage capacitor 3 is increased through the boost module 23, and a pressure difference is generated with the battery 1, and the battery 1 is charged at this time. Therefore, under the control of the IGBT module 2, the battery 1 realizes cyclic charging and discharging, and the internal temperature of the battery is increased.

[0029] No matter the battery 1 is discharged with a large current in a short time or the energy storage capacitor 3 is discharged, the liquid heating system can be operated through the circuit 7 .

[0030] Specifically, the liquid heating system includes a liquid heating body 41 and a liquid heating element 42, wherein the liquid heating element 42 is located inside the liquid heating body 41; a liquid working medium 43 is filled between the liquid heating body 41 and the liquid heating element 42. The liquid heating element 42 can be operated when the battery 1 is discharged or the energy storage capacitor 3 is discharged, so the IGBT module controls the first on-off switch 21 to be closed or controls the second on-off switch 22 to be closed, and the liquid heating element 42 continues to operate, thereby enabling the liquid working medium 43 to be continuously heated.

[0031] The liquid heating element 42 is preferably made of PTC ceramic material, and the liquid working medium 43 is preferably a mixture of water and ethylene glycol.

[0032] The present application can also heat the outside of the battery 1 synchronously through the battery external heating system, and the battery external heating system is connected to the liquid heating system. The battery external heating system includes a liquid heating plate 51 and a liquid pipeline arranged outside the battery 1; there is at least one liquid heating plate 51, which can be arranged at the bottom, side or top of the battery 1, and the liquid pipeline includes a liquid inlet pipeline 52 and a liquid outlet pipeline 53; the two ends of the liquid inlet pipeline 52 and the liquid outlet pipeline 53 are respectively connected to the liquid heating plate 51 and the liquid heating body 41, so that the liquid working medium 43 circulates in the liquid heating plate 51 and the liquid heating body 41.

[0033] The battery external heating system also includes a liquid circulation pump 54, which circulates the high-temperature liquid working medium 43 in the liquid heating plate 51 through the liquid inlet pipeline 52 and the liquid outlet pipeline 53, thereby heating the outside of the battery 1. The cooled liquid working medium 43 returns to the liquid heating system through the liquid pipeline and is heated again by the liquid heating element 42. The continuous heating power of the liquid heating element 42 is between 10W and 1000kW.

[0034] In order to protect the battery 1 and the liquid heating plate 51 from external impact and moisture, a battery outer box 6 can be set outside the battery 1 and the liquid heating plate 51. The energy storage capacitor 3 and the liquid circulation pump 54 can be set inside the battery outer box 6 or outside the battery outer box 6.

[0035] While the present application heats the interior of the battery 1 through cyclic charge and discharge operations, it can also utilize the connection between the battery's external heating system and the liquid heating system to heat the outer wall of the battery, thereby achieving simultaneous internal and external heating of the battery, further improving the battery's heating rate.

[0036] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A rapid heating system for a battery, Features: include, An IGBT module (2), the IGBT module (2) is used to control the cyclic charging and discharging of the battery (1) so as to increase the internal temperature of the battery; A battery external heating system is located outside the battery (1) and is used to increase the temperature of the battery exterior.

2. A rapid heating system for a battery according to claim 1, characterized in that: It also includes an energy storage capacitor (3); under the control of the IGBT module (2), the battery (1) discharges the energy storage capacitor (3) or the energy storage capacitor (3) charges the battery (1).

3. A rapid heating system for a battery according to claim 2, characterized in that: The circuit (7) is connected to the battery (1) and the energy storage capacitor (3) in sequence; the circuit (7) is provided with a first on-off switch (21) and a second on-off switch (22); the first on-off switch (21) and the second on-off switch (22) are connected in parallel and then connected in series with the energy storage capacitor (3); the IGBT module (2) is used to control the alternating closing and opening of the first on-off switch (21) and the second on-off switch (22).

4. A rapid heating system for a battery according to claim 3, characterized in that: When the IGBT module (2) controls the first on-off switch (21) to be closed, the battery (1) discharges the energy storage capacitor (3); when the IGBT module (2) controls the second on-off switch (22) to be closed, the energy storage capacitor (3) charges the battery (1).

5. A rapid heating system for a battery according to claim 3, characterized in that: The circuit (7) is also connected to a liquid heating system, which is located between the battery (1) and the energy storage capacitor (3) and can achieve continuous operation of the liquid heating system through discharge of the battery (1) or the energy storage capacitor (3); the battery external heating system is connected to the liquid heating system.

6. A rapid heating system for a battery according to claim 5, characterized in that: The circuit (7) is also connected to a boost module (23), and the boost module (23) is located between the energy storage capacitor (3) and the liquid heating system; the boost module (23) is connected in series with the second on-off switch (22) and then connected in parallel with the first on-off switch (21).

7. A rapid heating system for a battery according to claim 5, characterized in that: The liquid heating system comprises a liquid heating body (41) and a liquid heating element (42) located inside the liquid heating body (41); a liquid working medium (43) is filled between the liquid heating body (41) and the liquid heating element (42).

8. A rapid heating system for a battery according to claim 7, characterized in that: The battery external heating system comprises a liquid heating plate (51) and a liquid pipeline arranged outside the battery (1); two ends of the liquid pipeline are respectively connected to the liquid heating plate (51) and the liquid heating body (41), so that the liquid working medium (43) circulates in the liquid heating plate (51) and the liquid heating body (41).

9. A rapid heating system for a battery according to claim 8, characterized in that: The liquid pipeline at least comprises a liquid inlet pipeline (52) and a liquid outlet pipeline (53).

10. A rapid heating system for a battery according to claim 9, characterized in that: The battery external heating system also includes a liquid circulation pump (54), which is used to circulate the liquid working medium (43) in the liquid heating plate (51) through a liquid inlet pipeline (52) and a liquid outlet pipeline (53).

11. A rapid heating system for a battery according to claim 8, characterized in that: The battery outer box (6) is sleeved on the outside of the battery (1) and the liquid heating plate (51) and is used to protect the battery (1) and the liquid heating plate (51).

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