Lithium battery water cooling device

Abstract

The utility model provides a lithium battery water cooling device which comprises a heat exchanger, a circulating pump and a water cooling pipe, a circulating water pipe is arranged in the heat exchanger, and an outer water inlet and an outer water outlet are formed in the two ends of the circulating water pipe correspondingly and used for being externally connected with a cooling water source. The water cooling pipe penetrates through the heat exchanger, an inner water inlet and an inner water outlet are formed in the two ends of the water cooling pipe respectively and used for being connected with a lithium battery pack cooling pipeline, and the flow direction of water in the water cooling pipe in the heat exchanger is opposite to that of water in the circulating water pipe. The circulating pump is connected into the water cooling pipe and located between the inner water inlet and the heat exchanger. The flow direction of water in the water cooling pipe in the heat exchanger is opposite to that of water in the circulating water pipe, and the water in the water cooling pipe and the water in the circulating water pipe are in cross convection, so that the heat exchange efficiency is improved, the lithium battery can be quickly and effectively cooled, spontaneous combustion and explosion of the lithium battery in an extremely high-temperature environment are avoided, and the service life of the lithium battery is prolonged. And the stability and reliability of the lithium battery are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a water cooling device for lithium batteries. Background Technique

[0002] At present, shipbuilding technology is advancing by leaps and bounds. Generally, lithium batteries are used for internal power supply of new energy ships. Lithium batteries have excellent performance and many advantages, but they also have a fatal disadvantage, that is, the battery stability is poor, and it is extremely easy to catch fire and explode in an extremely high temperature environment. Therefore, it is necessary to cool the lithium batteries.

[0003] At present, for the heat dissipation of marine lithium batteries, the method of increasing the flow rate of the fan is mostly adopted, which wastes resources, and in many cases, increasing the fan flow rate cannot effectively enhance the heat dissipation of lithium batteries. Content of the Utility Model

[0004] In view of this, the utility model provides a water cooling device for lithium batteries to solve the technical problems in the above background technology that for the heat dissipation of marine lithium batteries, the method of increasing the flow rate of the fan is mostly adopted, which wastes resources, and in many cases, increasing the fan flow rate cannot effectively enhance the heat dissipation of lithium batteries.

[0005] The technical solution of the utility model is realized as follows:

[0006] The utility model provides a water cooling device for lithium batteries, including a heat exchanger, a circulation pump and a water cooling pipe, wherein:

[0007] A circulating water pipe is arranged inside the heat exchanger, and an external water inlet and an external water outlet are respectively arranged at both ends of the circulating water pipe. The external water inlet and the external water outlet are used for connecting to an external cooling water source;

[0008] The water cooling pipe passes through the heat exchanger, and an internal water inlet and an internal water outlet are respectively arranged at both ends of the water cooling pipe. The internal water inlet and the internal water outlet are used for connecting to the cooling pipeline of the lithium battery pack. The water flow direction of the water cooling pipe in the heat exchanger is opposite to the water flow direction of the circulating water pipe;

[0009] The circulation pump is connected into the water cooling pipe and is located between the internal water inlet and the heat exchanger.

[0010] On the basis of the above technical solutions, preferably, two circulation pumps are provided, and the two circulation pumps are connected in parallel to the water cooling pipe.

[0011] On the basis of the above technical solutions, preferably, a first ball valve and a second ball valve are respectively arranged at both ends of the circulation pump, and a check valve is further arranged at one end of the circulation pump close to the heat exchanger. The check valve is located between the circulation pump and the second ball valve.

[0012] On the basis of the above technical solutions, preferably, it further includes a gas-water separator, which is arranged on the water-cooling pipe and is used to remove the gas in the water-cooling pipe.

[0013] On the basis of the above technical solutions, preferably, the gas-water separator includes a water storage tank and an exhaust valve; the water storage tank is provided with a water inlet and a water outlet, the water inlet is arranged at the bottom of the water storage tank, the water inlet is connected to the inner water inlet, the water outlet is located above the water inlet, and the water outlet is connected to the circulation pump; the exhaust valve is arranged at the top of the water storage tank, and the exhaust valve can be opened to exhaust gas when the gas pressure in the water storage tank rises to reach a preset threshold.

[0014] On the basis of the above technical solutions, preferably, the water outlet is arranged at the lower part of the water storage tank.

[0015] On the basis of the above technical solutions, preferably, it further includes an expansion tank, which is connected to the water-cooling pipe and is used to temporarily store the cooling water required by the water-cooling pipe.

[0016] On the basis of the above technical solutions, preferably, it further includes a make-up water pipe and a make-up water pump. The make-up water pipe is connected to the water-cooling pipe, and the connection point is located between the expansion tank and the inner water inlet; the make-up water pump is connected to the make-up water pipe.

[0017] On the basis of the above technical solutions, preferably, a first pressure gauge and a first thermometer are arranged at a position on the water-cooling pipe close to the inner water inlet, and a second pressure gauge and a second thermometer are arranged at a position on the water-cooling pipe close to the inner water outlet; a third pressure gauge and a third thermometer are arranged at a position on the circulating water pipe close to the outer water inlet, and a fourth pressure gauge and a fourth thermometer are arranged at a position on the circulating water pipe close to the outer water outlet.

[0018] On the basis of the above technical solutions, preferably, a first drain valve and a second drain valve are arranged on the water-cooling pipe. The first drain valve is located between the inner water inlet and the heat exchanger, and the second drain valve is arranged between the inner water outlet and the heat exchanger.

[0019] The lithium battery water-cooling device of the present utility model has the following beneficial effects compared with the prior art:

[0020] (1) By arranging a circulating water pipe inside the heat exchanger, the water-cooling pipe passes through the heat exchanger, and the flow direction of the water in the water-cooling pipe in the heat exchanger is opposite to the flow direction of the water in the circulating water pipe. The water in the water-cooling pipe and the water in the circulating water pipe cross-convect, thereby improving the heat exchange efficiency, being able to quickly and effectively cool down the lithium battery, avoiding spontaneous combustion and explosion of the lithium battery in an extremely high-temperature environment, and improving the stability and reliability of the lithium battery.

[0021] (2) There are two of the circulating pumps, and the two circulating pumps are connected in parallel to the water cooling pipe. One of the two circulating pumps is in use and the other is in reserve. When one of the circulating pumps is damaged or needs maintenance, the other circulating pump can be used, which does not affect the water circulation in the water cooling pipe and improves the reliability and stability of the device;

[0022] (3) The gas-water separator is arranged on the water cooling pipe and is used to discharge the gas in the water cooling pipe, avoiding the air in the water cooling pipe from causing unstable water pressure and water flow, which affects the heat exchange effect, increases the operating noise of the equipment, and causes the cavitation phenomenon of the circulating pump, and improving the service life and reliability of the device;

[0023] (4) A first drain valve and a second drain valve are arranged on the water cooling pipe. The first drain valve is located between the inner water inlet and the heat exchanger, and the second drain valve is arranged between the inner water outlet and the heat exchanger. When the water cooling pipe is not in use or the device needs maintenance, the water in the water cooling pipe is drained through the first drain valve and the second drain valve, which is convenient for maintenance. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is the structural schematic diagram of the lithium battery water cooling device of the present invention;

[0026] Figure 2 It is the front view of the lithium battery water cooling device of the present invention;

[0027] Figure 3 It is the side view of the lithium battery water cooling device of the present invention;

[0028] Figure 4 It is the structural schematic diagram of the gas-water separator of the present invention.

[0029] Explanation of the reference numerals: 1 - heat exchanger, 2 - circulating pump, 3 - water cooling pipe, 4 - first ball valve, 5 - second ball valve, 6 - check valve, 7 - gas-water separator, 8 - filter, 9 - expansion tank, 10 - make-up water pipe, 11 - make-up water pump, 12 - first pressure gauge, 13 - first thermometer, 14 - second pressure gauge, 15 - second thermometer, 16 - third pressure gauge, 17 - third thermometer, 18 - fourth pressure gauge, 19 - fourth thermometer, 20 - first drain valve, 21 - second drain valve;

[0030] 101 - Circulating water pipe, 102 - External water inlet, 103 - External water outlet;

[0031] 301 - Internal water inlet, 302 - Internal water outlet;

[0032] 701 - Water storage tank, 702 - Exhaust valve, 703 - Water inlet, 704 - Water outlet. Detailed implementation mode

[0033] Next, in combination with the implementation mode of the present utility model, the technical solutions in the implementation mode of the present utility model will be clearly and completely described. Obviously, the described implementation mode is only a part of the implementation modes of the present utility model, rather than all the implementation modes. Based on the implementation modes in the present utility model, all other implementation modes obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present utility model.

[0034] Refer to Figures 1 - 4 As shown, this embodiment proposes a lithium battery water cooling device, including a heat exchanger 1, a circulating pump 2 and a water cooling pipe 3, wherein:

[0035] A circulating water pipe 101 is arranged inside the heat exchanger 1. An external water inlet 102 and an external water outlet 103 are respectively arranged at both ends of the circulating water pipe 101. The external water inlet 102 and the external water outlet 103 are used to connect to an external cooling water source to form an external water circulation loop; the heat exchanger 1 in this embodiment adopts a plate heat exchanger 1;

[0036] The water cooling pipe 3 passes through the heat exchanger 1. An internal water inlet 301 and an internal water outlet 302 are respectively arranged at both ends of the water cooling pipe 3. The internal water inlet 301 and the internal water outlet 302 are used to connect to the cooling pipeline of the lithium battery pack to form an internal water circulation loop. The flow direction of the water in the water cooling pipe 3 in the heat exchanger 1 is opposite to the flow direction of the water in the circulating water pipe 101; the water cooling pipe 3 and the circulating water pipe 101 do not communicate with each other inside the heat exchanger 1 and are intertwined and coiled inside the heat exchanger 1, and can exchange heat with each other;

[0037] The circulating pump 2 is connected to the water cooling pipe 3 and is located between the internal water inlet 301 and the heat exchanger 1. In this embodiment, the circulating pump 2 adopts a vertical multi-stage centrifugal pump.

[0038] The lithium battery water cooling device provided in this embodiment has a circulating water pipe 101 arranged inside the heat exchanger 1. The water cooling pipe 3 passes through the heat exchanger 1. The water flow direction of the water in the water cooling pipe 3 in the heat exchanger 1 is opposite to the water flow direction of the circulating water pipe 101. The water in the water cooling pipe 3 and the water in the circulating water pipe 101 cross-convect, thereby improving the heat exchange efficiency, being able to quickly and effectively cool down the lithium battery, avoiding spontaneous combustion and explosion of the lithium battery in an extremely high-temperature environment, and improving the stability and reliability of the lithium battery.

[0039] In some embodiments, there are two circulating pumps 2, and the two circulating pumps 2 are connected in parallel to the water cooling pipe 3. By having two circulating pumps 2 connected in parallel to the water cooling pipe 3, the two circulating pumps 2 are in a standby mode. When one of the circulating pumps 2 is damaged or needs maintenance, the other circulating pump 2 can be used, without affecting the water circulation in the water cooling pipe 3, improving the reliability and stability of the device.

[0040] In some embodiments, a first ball valve 4 and a second ball valve 5 are respectively arranged at both ends of the circulating pump 2, and a check valve 6 is further arranged at one end of the circulating pump 2 close to the heat exchanger 1, and the check valve 6 is located between the circulating pump 2 and the second ball valve 5. By respectively arranging the first ball valve 4 and the second ball valve 5 at both ends of the circulating pump 2, when the circulating pump 2 needs to be repaired or replaced, the circulating pump 2 can be repaired by closing the first ball valve 4 and the second ball valve 5, facilitating the maintenance of the circulating pump 2; through the setting of the check valve 6, during the normal use of the circulating pump 2, the water in the water cooling pipe 3 can be prevented from flowing back into the circulating pump 2, improving the reliability and stability of the device.

[0041] In some embodiments, the lithium battery water cooling device further includes a gas-water separator 7, and the gas-water separator 7 is arranged on the water cooling pipe 3 for removing the gas in the water cooling pipe 3. By arranging the gas-water separator 7 on the water cooling pipe 3 for removing the gas in the water cooling pipe 3, the air in the water cooling pipe 3 can be prevented from causing unstable water pressure and water flow, which affects the heat exchange effect, increases the operating noise of the equipment, and causes the cavitation phenomenon of the circulating pump 2, improving the service life and reliability of the device.

[0042] In some embodiments, the gas-water separator 7 includes a water storage tank 701 and an exhaust valve 702; the water storage tank 701 is provided with a water inlet 703 and a water outlet 704. The water inlet 703 is arranged at the bottom of the water storage tank 701 and is connected to the inner water inlet 301. The water outlet 704 is located above the water inlet 703 and is connected to the circulation pump 2. The exhaust valve 702 is arranged at the top of the water storage tank 701 and can be opened to exhaust gas when the gas pressure in the water storage tank 701 rises to reach a preset threshold. Water enters the water storage tank 701 from the water inlet 703, forms a buffering effect inside, facilitating the discharge of gas in the water. The continuously escaping gas accumulates at the highest point at the top of the water storage tank 701. When the gas pressure is greater than or equal to the preset threshold set by the exhaust valve 702, the valve opening is opened and the gas is continuously discharged. When the gas pressure is less than the preset threshold set by the exhaust valve 702, the valve opening is closed.

[0043] In some embodiments, the water outlet 704 is arranged at the lower part of the water storage tank 701. By arranging the water outlet 704 at the lower part of the water storage tank 701, it is possible to prevent gas from being inhaled into the water outlet 704 again and entering the water-cooling pipe 3, thereby improving the reliability and stability of the device.

[0044] In some embodiments, a filter 8 is further arranged on the circulating water pipe 101. The filter 8 is located between the external water inlet 102 and the heat exchanger 1 and is used to filter the cooling water entering the circulating pipe to prevent impurities from blocking the circulating water pipe 101, thereby improving the reliability and stability of the device.

[0045] In some embodiments, the lithium battery water-cooling device further includes an expansion tank 9. The expansion tank 9 is connected to the water-cooling pipe 3 and is used to temporarily store the cooling water required by the water-cooling pipe 3. By temporarily storing the cooling water required by the water-cooling pipe 3 in the expansion tank 9, when the cooling water in the water-cooling pipe 3 is lost, the cooling water can be replenished in time. Also, when the device is being maintained, the cooling water in the water-cooling pipe 3 can be collected, which is convenient for use when the device is restarted.

[0046] In some embodiments, the lithium battery water-cooling device further includes a makeup water pipe 10 and a makeup water pump 11. The makeup water pipe 10 is connected to the water-cooling pipe 3, and the connection point is located between the expansion tank 9 and the inner water inlet 301. The makeup water pipe 10 is externally connected to a cooling water source. The makeup water pump 11 is connected to the makeup water pipe 10. Cooling water is replenished to the water-cooling pipe 3 through the makeup water pipe 10, and the makeup water pump 11 pumps the water into the water-cooling pipe 3 to make up for the loss of cooling water, ensuring the flow rate of the cooling water in the water-cooling pipe 3, thereby ensuring the cooling effect of the water-cooling pipe 3 and improving the stability and reliability of the device. The makeup water pump 11 has a built-in filtering function and can filter the cooling water entering the water-cooling pipe 3 to prevent impurities from blocking the water-cooling pipe 3, improving the reliability and stability of the impurities.

[0047] In some embodiments, a first pressure gauge 12 and a first thermometer 13 are arranged at a position on the water-cooling pipe 3 close to the inner water inlet 301, and a second pressure gauge 14 and a second thermometer 15 are arranged at a position on the water-cooling pipe 3 close to the inner water outlet 302; a third pressure gauge 16 and a third thermometer 17 are arranged at a position on the circulating water pipe 101 close to the outer water inlet 102, and a fourth pressure gauge 18 and a fourth thermometer 19 are arranged at a position on the circulating water pipe 101 close to the outer water outlet 103. By measuring the pressures at several positions with the first pressure gauge 12, the second pressure gauge 14, the third pressure gauge 16 and the fourth pressure gauge 18 respectively, the pressures of the water-cooling pipe 3 and the circulating pipe are monitored. Whether there is a pipeline leakage can be known from whether the pressure drops. By measuring the temperatures at several positions with the first thermometer 13, the second thermometer 15, the third thermometer 17 and the fourth thermometer 19 respectively, the temperatures of the water-cooling pipe 3 and the circulating pipe are monitored, so as to know the cooling effect.

[0048] In some embodiments, a first drain valve 20 and a second drain valve 21 are arranged on the water-cooling pipe 3. The first drain valve 20 is located between the inner water inlet 301 and the heat exchanger 1, and the second drain valve 21 is arranged between the inner water outlet 302 and the heat exchanger 1. Since the first drain valve 20 is located between the inner water inlet 301 and the heat exchanger 1 and the second drain valve 21 is arranged between the inner water outlet 302 and the heat exchanger 1, when the water-cooling pipe 3 is not in use or the device needs to be maintained, the water in the water-cooling pipe 3 is drained through the first drain valve 20 and the second drain valve 21, which is convenient for maintenance.

[0049] The working principle of this lithium battery water-cooling device is as follows: circulating water is introduced into the circulating water pipe 101, and cooling water is introduced into the water-cooling pipe 3. The cooling water circulates in the water-cooling pipe 3 and the lithium battery cooling pipeline through the circulating pump 2 to cool the lithium battery. The water in the water-cooling pipe 3 and the water in the circulating water pipe 101 exchange heat in the heat exchanger 1, and the water in the water-cooling pipe 3 and the water in the circulating water pipe 101 cross-convect, so as to improve the heat exchange efficiency, quickly and effectively cool down the lithium battery, avoid the lithium battery from spontaneous combustion and explosion in an extremely high temperature environment, and improve the stability and reliability of the lithium battery.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lithium battery water cooling device, characterized in that It includes a heat exchanger, a circulation pump and a water-cooling pipe, where: A circulation water pipe is arranged inside the heat exchanger. An external water inlet and an external water outlet are respectively arranged at both ends of the circulation water pipe. The external water inlet and the external water outlet are used for connecting to an external cooling water source; The water-cooling pipe passes through the heat exchanger. An internal water inlet and an internal water outlet are respectively arranged at both ends of the water-cooling pipe. The internal water inlet and the internal water outlet are used for connecting to the cooling pipeline of the lithium battery pack. The water flow direction of the water-cooling pipe in the heat exchanger is opposite to the water flow direction of the circulation water pipe; The circulation pump is connected into the water-cooling pipe and is located between the internal water inlet and the heat exchanger.

2. The lithium battery water cooling device according to claim 1, wherein, There are two circulation pumps, and the two circulation pumps are connected in parallel to the water-cooling pipe.

3. The lithium battery water cooling device according to claim 2, wherein, A first ball valve and a second ball valve are respectively arranged at both ends of the circulation pump. A check valve is also arranged at the end of the circulation pump close to the heat exchanger, and the check valve is located between the circulation pump and the second ball valve.

4. The lithium battery water cooling device according to claim 1, characterized in that, It also includes a gas-water separator, which is arranged on the water-cooling pipe and is used for discharging the gas in the water-cooling pipe.

5. The lithium battery water cooling device according to claim 4, wherein, The gas-water separator includes a water storage tank and an exhaust valve; the water storage tank is provided with a water inlet and a water outlet. The water inlet is arranged at the bottom of the water storage tank and is connected to the internal water inlet. The water outlet is located above the water inlet and is connected to the circulation pump; the exhaust valve is arranged at the top of the water storage tank, and the exhaust valve can be opened to exhaust when the gas pressure in the water storage tank rises to reach a preset threshold.

6. The lithium battery water cooling device according to claim 5, characterized in that, The water outlet is arranged at the lower part of the water storage tank.

7. The lithium battery water cooling device according to claim 1, wherein It also includes an expansion tank, which is connected into the water-cooling pipe and is used for temporarily storing the cooling water required by the water-cooling pipe.

8. The lithium battery water cooling device according to claim 7, wherein, It also includes a make-up water pipe and a make-up water pump. The make-up water pipe is connected into the water-cooling pipe, and the connection point is located between the expansion tank and the internal water inlet; the make-up water pump is connected into the make-up water pipe.

9. The lithium battery water cooling device according to any one of claims 1-8, characterized in that, A first pressure gauge and a first thermometer are arranged at the position of the water-cooling pipe close to the internal water inlet. A second pressure gauge and a second thermometer are arranged at the position of the water-cooling pipe close to the internal water outlet; a third pressure gauge and a third thermometer are arranged at the position of the circulation water pipe close to the external water inlet. A fourth pressure gauge and a fourth thermometer are arranged at the position of the circulation water pipe close to the external water outlet.

10. The lithium battery water cooling device according to any one of claims 1-8, characterized in that, A first drain valve and a second drain valve are arranged on the water-cooling pipe. The first drain valve is located between the internal water inlet and the heat exchanger, and the second drain valve is arranged between the internal water outlet and the heat exchanger.

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