Full-immersion liquid-cooled battery pack anti-vortex device

Abstract

The utility model provides an anti-vortex device for a fully-immersed liquid-cooled battery pack, and belongs to the technical field of batteries. The interior of a box body is hollow, and at least one water inlet pipe and at least one water outlet pipe are arranged on different side faces of the box body respectively, communicate with the interior of the box body and are in sealed connection with the interior of the box body; the battery pack is arranged in the box body; the at least one medium stirring device is arranged in the box body, is hinged with the box body, and abuts against the side surface, where the at least one water inlet pipe is located, of the box body; the at least one first variable frequency pump is in one-to-one corresponding pipeline communication with the at least one water inlet pipe; wherein the output power of the at least one first variable frequency pump is adjustable, the at least one medium stirring device is driven to rotate relative to the box body, and the included angle between the at least one medium stirring device and the box body is adjusted. By arranging the first variable frequency pump and the at least one medium stirring device, the stirring of the medium in the box body is realized, the dynamic uniform mixing of the immersed medium is realized, and the phenomenon of local overheating of the battery pack caused by eddy current is avoided.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an anti-eddy current device for a fully immersed liquid-cooled battery pack. Background Technology

[0002] As lithium battery technology matures, thermal management technology becomes increasingly important. Currently, the industry mainly uses cold plate liquid cooling, but this often results in uneven temperatures between the top and bottom of the battery cell.

[0003] Battery packs with full immersion liquid cooling have appeared on the market. This means that the battery cells are immersed in the battery pack to perform thermal management. However, since the battery pack is completely submerged in the medium, it is necessary to avoid eddy currents in the heat exchange medium during dynamic thermal management, which may lead to localized high temperatures in the battery pack.

[0004] Therefore, it is essential to provide an anti-eddy current device for fully immersed liquid-cooled battery packs to ensure uniform temperature distribution among different battery packs and improve the phenomenon of possible localized high temperatures. Utility Model Content

[0005] In view of this, the present invention proposes a fully immersion liquid-cooled battery pack anti-eddy current device that can agitate the medium entering the battery box, effectively prevent the formation of eddies in the battery box, and improve the temperature uniformity of the battery pack.

[0006] This utility model provides an anti-eddy current device for a fully immersed liquid-cooled battery pack, comprising:

[0007] The box is hollow inside, and at least one water inlet pipe and one water outlet pipe are respectively provided on different sides of the box. At least one water inlet pipe and one water outlet pipe are connected to the inside of the box and are sealed.

[0008] The battery pack is located inside the casing;

[0009] At least one medium agitation device is disposed inside the tank, hinged to the tank, and abuts against the side surface of the tank where at least one water inlet pipe is located;

[0010] At least one first variable frequency pump is connected to at least one corresponding water inlet pipe;

[0011] The output power of at least one first variable frequency pump is adjustable, and it drives at least one medium agitator to rotate relative to the tank, adjusting the angle between the at least one medium agitator and the tank.

[0012] Based on the above technical solutions, preferably, the at least one medium agitation device includes a rotating shaft, two hinged parts and a lifting plate. The two hinged parts are spaced apart and fixedly disposed on the side surface inside the housing. The rotating shaft is disposed between the two hinged parts and hinged to the two hinged parts. One end of the lifting plate is fixedly connected to the side surface of the rotating shaft, and the other end of the lifting plate extends outward along the radial direction of the rotating shaft.

[0013] Preferably, at least one medium agitation device is provided in correspondence with at least one water inlet pipe, and the water inlet pipe is positioned directly opposite the geometric center of the lifting plate.

[0014] Preferably, the angle between the lifting plate and the side surface of the box is 0-90°.

[0015] More preferably, when the number of media agitation devices exceeds one, at least one media agitation device is spaced apart along a first preset direction, and the angle between the agitation plate of different media agitation devices and the side surface of the tank is not exactly the same; the first preset direction is the horizontal extension direction of the side surface of the tank where at least one water inlet pipe is opened.

[0016] Based on the above technical solutions, preferably, the system also includes a liquid storage tank and a heat exchange unit. The liquid storage tank is located outside the tank and is connected to at least one inlet pipe and one outlet pipe for storing the medium. The heat exchange unit is in circulatory communication with the inside of the liquid storage tank for exchanging heat with the medium in the liquid storage tank.

[0017] Based on the above technical solutions, a preferred embodiment also includes a second variable frequency pump, which is connected to the outlet pipe and the storage tank pipeline.

[0018] Preferably, it also includes a BMS and a temperature measurement circuit. The temperature measurement circuit is disposed on the battery pack and is used to measure the temperature of the battery pack. The output terminal of the temperature measurement circuit, at least one first frequency converter pump and a second frequency converter pump are electrically connected to the BMS.

[0019] More preferably, the temperature measurement circuit includes a reference resistor and a thermistor. One end of the reference resistor is electrically connected to the reference voltage terminal of the BMS, and the other end of the reference resistor is electrically connected to one end of the thermistor and the temperature measurement signal input terminal of the BMS. The other end of the thermistor is grounded.

[0020] Based on the above technical solutions, preferably, a cover plate is also included, with an opening provided on the box body, and the cover plate is placed on the opening and sealed to the box body.

[0021] The present invention provides an anti-eddy current device for a fully immersed liquid-cooled battery pack, which has the following advantages compared with the prior art:

[0022] (1) By configuring a medium stirring device and a first frequency conversion pump, this utility model can stir the medium of the immersed battery pack sent into the box, avoid the occurrence of eddy currents, make the temperature of each part of the battery pack more uniform, and improve the uniformity of battery temperature.

[0023] (2) Lifting the plate to block the water inlet pipe can also prevent the medium from directly impacting the surface of the battery pack;

[0024] (3) When multiple media agitation devices are configured, different media agitation devices can be used in turn to reduce the impact of media agitation. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of an anti-eddy current device for a fully immersed liquid-cooled battery pack according to the present invention;

[0027] Figure 2 for Figure 1 A magnified schematic diagram of the AA cross-section;

[0028] Figure 3 for Figure 1 Enlarged cross-sectional diagram of BB;

[0029] Figure 4 This is a wiring diagram of the temperature measurement circuit and BMS for an anti-eddy current device for a fully immersed liquid-cooled battery pack according to this utility model.

[0030] Figure 5 This is a perspective view of the anti-eddy current device for a fully immersed liquid-cooled battery pack according to this utility model after the cover plate is used;

[0031] Figure 6 This is a schematic diagram of the output power curve when at least one first frequency converter pump drives at least one medium agitation device in the anti-eddy current device of a fully immersed liquid-cooled battery pack according to the present invention.

[0032] Reference numerals: 1. Housing; 100. Inlet pipe; 200. Outlet pipe; 2. Battery pack; 3. Medium agitation device; M1. First variable frequency pump; 31. Rotating shaft; 32. Hinge; 33. Lifting plate; 4. Liquid storage tank; 5. Heat exchange unit; M2. Second variable frequency pump; R1. Reference resistor; NTC. Thermistor; 6. Cover plate. Detailed Implementation

[0033] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0034] Fully submerged liquid-cooled battery packs manage thermally by immersing the cells in a liquid cooling medium. However, because the battery pack is completely submerged, localized eddy currents may occur during dynamic thermal management, leading to localized high temperatures within the battery pack. Therefore, if... Figure 1 As shown, this utility model provides an anti-eddy current device for a fully immersed liquid-cooled battery pack, comprising:

[0035] The interior of the housing 1 is hollow, and at least one water inlet pipe 100 and water outlet pipe 200 are respectively provided on different sides of the housing 1. At least one water inlet pipe 100 and water outlet pipe 200 are connected to the interior of the housing 1 and are sealed. The water inlet pipe 100 and water outlet pipe 200 are used for unidirectional feeding and unidirectional recovery of the medium.

[0036] Battery pack 2 is installed inside housing 1; battery pack 2 achieves full immersion liquid cooling heat exchange through the medium fed into housing 1.

[0037] At least one medium agitation device 3 is disposed inside the tank 1, hinged to the tank 1, and abuts against the side surface of the tank 1 where at least one water inlet pipe 100 is located; the medium agitation device 3 is used to agitate the medium fed into the tank 1 to avoid generating eddies inside the tank 1, especially in the corners.

[0038] At least one first variable frequency pump M1 is connected to at least one water inlet pipe 100 in a one-to-one correspondence pipeline;

[0039] The output power of at least one first variable frequency pump M1 is adjustable, and it drives at least one medium agitation device 3 to rotate relative to the tank 1, thereby adjusting the angle between the at least one medium agitation device 3 and the tank 1.

[0040] By adjusting the output power of the first variable frequency pump M1, the opening range of the medium agitation device 3 can be changed, which can prevent the medium from directly impacting the side surface of the battery pack. The impact force of the first variable frequency pump M1 and the gravity of the medium agitation device 3 can achieve dynamic balance. It can also agitate the medium sent into the box 1, especially the medium in the corner of the box, and better mix the medium in the box, thereby avoiding eddies and local high temperature of the battery pack.

[0041] In one embodiment, such as Figure 5As shown, a cover plate 6 is also provided at the top opening of the box 1. The cover plate 6 is placed on the opening to seal the box 1.

[0042] like Figure 1 Combination Figure 2 and Figure 3 As shown, at least one medium agitation device 3 includes a rotating shaft 31, two hinged parts 32, and a lifting plate 33. The two hinged parts 32 are spaced apart and fixedly disposed on the side surface inside the housing 1. The rotating shaft 31 is disposed between and hinged to the two hinged parts 32. One end of the lifting plate 33 is fixedly connected to the side surface of the rotating shaft 31, and the other end of the lifting plate 33 extends outward along the radial direction of the rotating shaft 31. The hinged parts 32 are used to define the position of the rotating shaft 31, and the position of the rotating shaft 31 determines the opening angle of the lifting plate 33. If the position of the rotating shaft 31 also abuts against the cover plate 6, the opening angle of the lifting plate 33 relative to the side surface of the housing 1 ranges from 0 to 90°.

[0043] To better facilitate the rotation of the lifting plate 33, in this embodiment, at least one medium agitation device 3 is correspondingly arranged with at least one water inlet pipe 100, and the water inlet pipe 100 is positioned directly opposite the geometric center of the lifting plate 33. The geometric center of the lifting plate 33 can be the intersection of the diagonal lines formed by the vertices of the surface of the lifting plate 33 closest to the water inlet pipe 100. To reduce noise when the lifting plate 33 opens or closes, sound-absorbing buffer material can be provided on the cover plate 6 or the side of the housing to reduce noise when the lifting plate 33 resets or abuts against the cover plate.

[0044] like Figure 1 , Figure 2 and Figure 3 As shown, if only one medium agitation device 3 is provided, the flow rate of the medium entering the tank 1 may fluctuate drastically. As an embodiment of the present invention, when the number of medium agitation devices 3 exceeds one, at least one medium agitation device 3 is arranged at intervals along a first preset direction, and the angle between the lifting plate 33 of different medium agitation devices 3 and the side surface of the tank 1 is not exactly the same; the first preset direction is the horizontal extension direction of the side surface of the tank 1 where at least one water inlet pipe 100 is opened.

[0045] like Figure 1The structure shown has two water inlet pipes 100 and two media agitation devices 3 on the housing 1. The operating states of the first variable frequency pumps M1 corresponding to the media agitation devices 3 can be different or the same. To distinguish between the different first variable frequency pumps, M11 and M12 are used. When the battery pack temperature is relatively uniform, both first variable frequency pumps M11 and M12 operate in a constant power output state, and the opening angle of the lifting plates 33 of the corresponding two media agitation devices 3 remains unchanged. When the battery pack temperature is uneven, or when there may be eddies in the housing, the output power of at least one first variable frequency pump is adjusted, such as 1) keeping the power of the first variable frequency pump M11 constant and the power of the first variable frequency pump M12 fluctuating periodically; 2) the power of the first variable frequency pump fluctuates periodically, and the power of the first variable frequency pump M12 remains constant; or 3) the power of both the first variable frequency pumps M11 and M12 fluctuates periodically. In the case of 3), the power fluctuations of the first variable frequency pumps M11 and M12 can be synchronous or asynchronous. The output power variation curve of the first variable frequency pump M1 is shown in the attached figure. Figure 6 , Figure 6 The dashed line parallel to the horizontal axis can be understood as the minimum power of the first variable frequency pump M1 that drives the lifting plate 33 to rotate.

[0046] like Figure 1 As shown, to form a complete medium circulation and heat dissipation process, this utility model also includes a liquid storage tank 4 and a heat exchange unit 5. The liquid storage tank 4 is located outside the housing 1 and is connected to at least one inlet pipe 100 and one outlet pipe 200, respectively, for storing the medium. The heat exchange unit 5 is circulated inside the liquid storage tank 4 and is used to exchange heat with the medium in the liquid storage tank 4. The heat exchange unit 5 achieves circulating heat exchange of the medium in the liquid storage tank 4 through coils inside the liquid storage tank and compressors outside the liquid storage tank, thereby keeping the temperature of the medium in the liquid storage tank 4 stable.

[0047] In one embodiment, such as Figure 1 As shown, to accelerate the circulation speed of the medium, a second variable frequency pump M2 can be further installed. The second variable frequency pump M2 is connected to the outlet pipe 200 and the storage tank 4. The second variable frequency pump M2 is used to pump the medium in the tank into the storage tank 4.

[0048] like Figure 4 As shown, in order to better obtain the temperature at different locations of the battery pack, this utility model is also equipped with a BMS and a temperature measurement circuit. The temperature measurement circuit is set on the battery pack 2 and is used to measure the temperature of the battery pack 2. The output terminal of the temperature measurement circuit, at least one first frequency converter pump M1 and a second frequency converter pump M2 are electrically connected to the BMS.

[0049] Specifically, the temperature measurement circuit includes a reference resistor R1 and a thermistor NTC. One end of the reference resistor R1 is electrically connected to the reference voltage terminal VREF of the BMS, and the other end of the reference resistor R1 is electrically connected to one end of the thermistor NTC and the temperature measurement signal input terminal of the BMS. The other end of the thermistor NTC is grounded. The thermistor NTC is a negative temperature coefficient component; its resistance decreases as the temperature increases. By acquiring the voltage signal VTEMP after voltage division, the resistance of the thermistor NTC has a non-linear relationship with temperature. The performance curve can be obtained from the product manual. Based on the ratio of the voltage signal VTEMP to VERF, the current resistance value of the thermistor NTC can be obtained, i.e., NTC / (NTC+R1) = VTEMP / VREF. The current temperature of battery pack 2 can be calculated by looking up a table. By arranging multiple temperature measurement circuits, the temperature distribution at different locations of the battery pack can be obtained, thereby maintaining or changing the operating state of the first frequency converter pump M1 accordingly.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A eddy current prevention device for a fully immersed liquid-cooled battery pack, characterized in that, include: The box (1) is hollow inside, and at least one water inlet pipe (100) and water outlet pipe (200) are respectively provided on different sides of the box (1). At least one water inlet pipe (100) and water outlet pipe (200) are connected to the inside of the box (1) and sealed. Battery pack (2) is installed inside the housing (1); At least one medium agitation device (3) is disposed inside the tank (1), is hinged to the tank (1), and abuts against the side surface of the tank (1) where at least one water inlet pipe (100) is located; At least one first variable frequency pump (M1) is connected to at least one water inlet pipe (100) in a one-to-one correspondence pipeline; The output power of at least one first variable frequency pump (M1) is adjustable, and it drives at least one medium agitator (3) to rotate relative to the tank (1), thereby adjusting the angle between the at least one medium agitator (3) and the tank (1).

2. The anti-eddy current device for a fully immersed liquid-cooled battery pack according to claim 1, characterized in that, The at least one medium agitation device (3) includes a rotating shaft (31), two hinged parts (32) and a lifting plate (33). The two hinged parts (32) are spaced apart and fixedly arranged on the side surface inside the housing (1). The rotating shaft (31) is arranged between the two hinged parts (32) and hinged to the two hinged parts (32). One end of the lifting plate (33) is fixedly connected to the side surface of the rotating shaft (31), and the other end of the lifting plate (33) extends outward along the radial direction of the rotating shaft (31).

3. The anti-eddy current device for a fully immersed liquid-cooled battery pack according to claim 2, characterized in that, At least one medium agitation device (3) is provided in correspondence with at least one water inlet pipe (100), and the water inlet pipe (100) is positioned directly opposite the geometric center of the lifting plate (33).

4. The anti-eddy current device for a fully immersed liquid-cooled battery pack according to claim 2, characterized in that, The angle between the lifting plate (33) and the side surface of the box (1) is 0-90°.

5. A eddy current prevention device for a fully immersed liquid-cooled battery pack according to any one of claims 3 or 4, characterized in that, When the number of media agitation devices (3) exceeds one, at least one media agitation device (3) is spaced apart along a first preset direction, and the angle between the lifting plate (33) of different media agitation devices (3) and the side surface of the box body (1) is not exactly the same; the first preset direction is the horizontal extension direction of the side surface of the box body (1) where at least one water inlet pipe (100) is opened.

6. The anti-eddy current device for a fully immersed liquid-cooled battery pack according to claim 1, characterized in that, It also includes a liquid storage tank (4) and a heat exchange unit (5). The liquid storage tank (4) is located outside the box (1) and is connected to at least one inlet pipe (100) and one outlet pipe (200) for storing the medium. The heat exchange unit (5) is in circulatory communication with the inside of the liquid storage tank (4) for exchanging heat with the medium in the liquid storage tank (4).

7. The anti-eddy current device for a fully immersed liquid-cooled battery pack according to claim 1, characterized in that, It also includes a second variable frequency pump (M2), which is connected to the outlet pipe (200) and the storage tank (4).

8. The anti-eddy current device for a fully immersed liquid-cooled battery pack according to claim 7, characterized in that, It also includes a BMS and a temperature measurement circuit. The temperature measurement circuit is set on the battery pack (2) and is used to measure the temperature of the battery pack (2). The output terminal of the temperature measurement circuit, at least one first frequency converter pump (M1) and a second frequency converter pump (M2) are electrically connected to the BMS.

9. The anti-eddy current device for a fully immersed liquid-cooled battery pack according to claim 8, characterized in that, The temperature measurement circuit includes a reference resistor (R1) and a thermistor (NTC). One end of the reference resistor (R1) is electrically connected to the reference voltage terminal of the BMS, and the other end of the reference resistor (R1) is electrically connected to one end of the thermistor (NTC) and the temperature measurement signal input terminal of the BMS. The other end of the thermistor (NTC) is grounded.

10. The anti-eddy current device for a fully immersed liquid-cooled battery pack according to claim 1, characterized in that, It also includes a cover plate (6), and the box body (1) has an opening. The cover plate (6) is placed over the opening and is sealed to the box body (1).

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