Battery pack hybrid cooling plate and cooling system

Abstract

The invention discloses a battery pack hybrid cooling plate and a cooling system, and belongs to the technical field of battery cooling. The technical problems in the prior art that the temperature of a battery monomer in a water inlet area of a traditional liquid-cooled battery pack is higher than that of a battery monomer in a water outlet area, the consistency of the battery monomers is influenced, and the service life of the battery pack is further influenced are solved. The battery pack mixed cooling plate comprises a cooling plate body, the cooling plate body comprises a plurality of mixed cooling pipes; the mixed cooling pipe comprises a liquid distribution terminal, a confluence terminal, a liquid inlet pipeline and a liquid outlet pipeline; the liquid distribution terminal and the confluence terminal are arranged at the two ends of the mixed cooling pipe, the liquid distribution terminal is in butt joint with the liquid inlet end of the mixed cooling pipe, and the confluence terminal is in butt joint with the liquid outlet end of the mixed cooling pipe; the liquid inlet pipeline is connected with the liquid separation terminal; and the confluence terminal is connected with the liquid outlet pipeline. The phase-change material and the cooling liquid are mixed and cooled, so that the uniformity of heat exchange can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cooling, and particularly to a battery pack hybrid cooling plate and a cooling system. Background Art

[0002] In recent years, electric vehicles have developed rapidly, and power batteries are the power sources of electric vehicles. Common cooling methods for power batteries include air cooling, liquid cooling, and phase change material cooling. Among them, liquid cooling has become the most widely used cooling method due to its high cooling efficiency and low cost. However, when the power battery system operates at high power, due to battery heating, the water temperature rises when the liquid flows in the battery pack, resulting in the temperature of the battery cells in the liquid outlet area of the battery pack using traditional liquid cooling being higher than that of the battery cells in the liquid inlet area, affecting the consistency of the battery cells and further affecting the life of the battery pack. In addition, this method requires an external water cooler to cool the coolant and requires external power supply for the water cooler. Summary of the Invention

[0003] In view of the above analysis, the present invention aims to provide a battery pack hybrid cooling plate and a cooling system to solve the technical problem that the temperature of the battery cells in the water inlet area of the battery pack using traditional liquid cooling is higher than that of the battery cells in the water outlet area, affecting the consistency of the battery cells and further affecting the life of the battery pack.

[0004] The object of the present invention is mainly achieved through the following technical solutions:

[0005] On the one hand, the present invention provides a battery pack hybrid cooling plate, including a cooling plate body; the cooling plate body includes a plurality of hybrid cooling tubes;

[0006] The hybrid cooling tube includes a liquid distribution terminal, a liquid confluence terminal, a liquid inlet pipe and a liquid outlet pipe; the liquid distribution terminal and the liquid confluence terminal are arranged at both ends of the hybrid cooling tube, the liquid distribution terminal is butt-connected to the liquid inlet end of the hybrid cooling tube, and the liquid confluence terminal is butt-connected to the liquid outlet end of the hybrid cooling tube; the liquid inlet pipe is connected to the liquid distribution terminal; the liquid confluence terminal is connected to the liquid outlet pipe.

[0007] In a possible design, the structures of the plurality of hybrid cooling tubes are the same and are arranged in parallel;

[0008] A plurality of liquid flow channels are provided on the hybrid cooling tube.

[0009] In a possible design, a first exhaust port of the liquid flow channel is provided at the top of the liquid distribution terminal; a threaded structure is provided on the inner wall of the first exhaust port; a first bolt is installed in the first exhaust port.

[0010] In a possible design, a second exhaust port is provided at the top of the liquid confluence terminal; a threaded structure is provided on the inner wall of the second exhaust port; a second bolt is installed in the second exhaust port.

[0011] In a possible design, a plurality of phase change material filling channels are further provided on the hybrid cooling tube; the plurality of phase change material filling channels are arranged in parallel with the plurality of liquid flow channels.

[0012] In a possible design, a phase change material dispensing terminal is further provided on the hybrid cooling tube; the phase change material dispensing terminal is arranged at the inlet end of the phase change material filling channel and is butt-connected thereto.

[0013] In a possible design, a phase change material dispensing terminal injection port is provided on the phase change material dispensing terminal; the phase change material dispensing terminal injection port is butt-connected to the phase change material filling channel.

[0014] In a possible design, an exhaust terminal is provided at the outlet end of the phase change material filling channel. A third exhaust port is provided on the exhaust terminal. A threaded structure is provided on the inner wall of the third exhaust port, and a third bolt is installed in the third exhaust port.

[0015] In a possible design, a threaded structure is provided on the inner wall of the phase change material dispensing terminal injection port. A fourth bolt can be installed in the phase change material dispensing terminal injection port. After injecting the phase change material into the phase change material filling channel, the fourth bolt is used to block the phase change material dispensing terminal injection port.

[0016] On the other hand, the present invention further provides a battery pack hybrid cooling system, including the above-mentioned battery pack hybrid cooling plate.

[0017] Compared with the prior art, the present invention can at least achieve one of the following beneficial effects:

[0018] (1) For the battery pack hybrid cooling plate and cooling system provided by the present invention, a heat exchange is carried out by a hybrid cooling method of liquid cooling and phase change material, taking into account both the cooling efficiency and the uniformity of heat exchange.

[0019] (2) The present invention provides a battery pack hybrid cooling plate and cooling system, which carry out heat exchange by a hybrid cooling method of liquid cooling and phase change material. It can take into account both the cooling efficiency and the uniformity of heat exchange, effectively improve the cooling effect during the operation of the battery pack, alleviate the problem of cell consistency, and enhance the cycle durability of the battery pack.

[0020] In the present invention, the above technical solutions can also be combined with each other to achieve more preferred combination schemes. Other features and advantages of the present invention will be described in the subsequent specification, and some advantages can be made obvious from the specification, or understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained from the content specifically pointed out in the specification embodiments and the drawings. Description of the Drawings

[0021] The accompanying drawings are only for the purpose of showing specific embodiments and are not considered to be a limitation of the present invention. Throughout the drawings, the same reference numerals denote the same components.

[0022] Figure 1 is a schematic diagram of the overall structure of the hybrid cooling plate of the present invention;

[0023] Figure 2 is a longitudinal sectional view of the hybrid cooling tube of the present invention;

[0024] Figure 3 is a schematic diagram of the structure of the liquid distribution terminal of the present invention;

[0025] Figure 4 is a schematic diagram of the structure of the phase change material dispensing terminal of the present invention;

[0026] Figure 5 is a schematic diagram of the structure of the liquid flow channel and the phase change material filling channel of the present invention.

[0027] Reference numerals:

[0028] 101 - inlet liquid distribution pipe; 102 - cooling plate body; 103 - outlet liquid collecting pipe; 201 - inlet pipeline; 202 - liquid distribution terminal; 203 - liquid flow channel; 204 - phase change material filling channel; 205 - collecting terminal; 206 - outlet pipeline; 301 - liquid distribution terminal inlet; 302 - first exhaust port; 303 - phase change material dispensing terminal; 401 - phase change material injection port; 402 - phase change material dispensing terminal injection port; 501 - phase change material filling channel; 502 - liquid flow channel. Detailed embodiments

[0029] The preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. The accompanying drawings form a part of the present invention and are used together with the embodiments of the present invention to explain the principles of the present invention, and are not used to limit the scope of the present invention.

[0030] On the one hand, the present invention provides a battery pack hybrid cooling plate, as Figure 1 and Figure 2 shown, comprising a cooling plate body 102; the cooling plate body 102 includes a plurality of hybrid cooling tubes; the hybrid cooling tubes include a liquid distribution terminal 202, a collecting terminal 205, an inlet pipeline 201 and an outlet pipeline 206; the liquid distribution terminal 202 and the collecting terminal 205 are provided at both ends of the hybrid cooling tube, the liquid distribution terminal 202 is butt - connected to the inlet end of the hybrid cooling tube, the collecting terminal 205 is butt - connected to the outlet end of the hybrid cooling tube; the inlet pipeline 201 is connected to the liquid distribution terminal 202; the collecting terminal 205 is connected to the outlet pipeline 206.

[0031] Specifically, the battery pack hybrid cooling plate of the present invention includes a cooling plate body 102, and a liquid inlet distributing pipe 101 and a liquid outlet collecting pipe 103 provided at both ends of the cooling plate body 102; both the liquid inlet distributing pipe 101 and the liquid outlet collecting pipe 103 are connected to a liquid cooling device, and the liquid cooling device is used to provide a coolant for cooling the battery pack. The cooling plate body 102 includes a plurality of hybrid cooling pipes. Exemplarily, the number of hybrid cooling pipes is 2 to 7 (for example, the number of hybrid cooling pipes is 5). The hybrid cooling pipes are arranged parallel to each other. The hybrid cooling pipe is a cuboid plate structure. Along the length direction of the hybrid cooling pipe, the hybrid cooling pipe is provided with a plurality of liquid flow channels 203 (for example, 2 to 5 liquid flow channels 203), and each liquid flow channel 203 is parallel to each other; wherein, the number of liquid flow channels 203 (that is, the number of its liquid inlet ports) is equal to the number of liquid inlet ports of the distributing terminal 202 and the two are butt-connected, and the distributing terminal 202 is connected to the liquid inlet pipe 201; similarly, the number of liquid flow channels 203 (that is, the number of its liquid outlet ports) is equal to the number of liquid outlet ports of the collecting terminal 205 and the two are butt-connected, and the collecting terminal 205 is connected to the liquid outlet pipe 206.

[0032] When injecting the coolant into the hybrid cooling pipe, the coolant enters the hybrid cooling pipe through the distributing pipe and the liquid inlet port 301 of the distributing terminal, and cools the adjacent battery pack. After cooling, it flows into the liquid outlet pipe 206 through the liquid outlet port of the collecting terminal 205 until it is discharged from the battery pack hybrid cooling plate.

[0033] Most of the prior arts adopt a single cooling method. When the power battery system operates at high power, due to battery heating, the temperature of the battery cells in the water inlet area of the battery pack adopting the traditional single cooling method is higher than that of the battery cells in the water outlet area, which affects the consistency of the battery cells and further affects the life of the battery pack.

[0034] Compared with the prior art, by setting the hybrid cooling pipe and adopting the hybrid cooling method, the present invention can improve the cooling effect of the battery pack cooling plate, make the cooling effect of the battery pack cooling plate more uniform, ensure that the temperature of the battery cells in the water inlet area of the battery pack is equal to that of the battery cells in the water outlet area, and further ensure the consistency of the battery cells and improve the life of the battery pack.

[0035] It should be noted that, as Figure 3 shown, a first exhaust port 302 of the liquid flow channel 203 is provided at the top of the distributing terminal 202; a threaded structure is provided on the inner wall of the first exhaust port 302; a first bolt is installed in the first exhaust port 302.

[0036] Exemplarily, a first exhaust port 302 is provided at the top of the liquid distribution terminal 202, and the first exhaust port 302 communicates with the adjacent liquid flow channel 203; when injecting coolant into the hybrid cooling plate, the air in the liquid distribution terminal 202 can be discharged through the first exhaust port 302. After the air is completely discharged, a first bolt is screwed into the first exhaust port 302 to block the first exhaust port 302 and prevent coolant leakage.

[0037] Similarly, a second exhaust port is provided at the top of the current collecting terminal 205; a threaded structure is provided on the inner wall of the second exhaust port; a second bolt is installed in the second exhaust port.

[0038] Exemplarily, the second exhaust port at the top of the current collecting terminal 205 communicates with the adjacent liquid flow channel 203. When injecting coolant into the hybrid cooling plate, the air in the hybrid cooling pipe can be discharged from the hybrid cooling plate through the second exhaust port. After the air in the liquid flow channel 203 is completely emptied, the second bolt is screwed into the second exhaust port to block the second exhaust port and prevent coolant leakage.

[0039] As Figure 2 and Figure 5 shown, a plurality of phase change material filling channels 204 are further provided on the above-mentioned hybrid cooling pipe; the plurality of phase change material filling channels 204 are arranged in parallel with the plurality of liquid flow channels 203.

[0040] Specifically, a plurality of phase change material filling channels 204 are further provided along the length direction of the hybrid cooling pipe. The number of phase change material filling channels 204 is 2 - 6 (for example, the number is 4). The phase change material filling channels 204 are arranged in parallel and at intervals with the liquid flow channels 203.

[0041] Exemplarily, as Figure 5 shown, the hybrid cooling pipe is in a cuboid plate-like structure. The hybrid cooling pipe includes four phase change material filling channels 204 and three liquid flow channels 203. The four phase change material filling channels 204 are divided into two groups in pairs. The liquid flow channels 203 are arranged on both sides of each group of phase change material filling channels 204; that is, the arrangement is: the liquid flow channels, a group of phase change material filling channels 204, the liquid flow channel 203, a group of phase change material filling channels 204, and the liquid flow channel 203 are arranged in sequence along the width direction of the hybrid cooling pipe.

[0042] It should be emphasized that by adopting the above-mentioned interlaced arrangement of the liquid flow channels 203 and the phase change material filling channels 204, the phase change material filling channels 204 can be as close as possible to the battery heat generation center position, thereby improving the uniformity of heat exchange.

[0043] For filling the phase change material, the hybrid cooling plate of the battery pack of the present invention further includes a phase change material dispensing terminal 303 and a phase change material converging terminal. The phase change material dispensing terminal 303 is provided at the inlet end of the phase change material filling channel 204 and is connected thereto in a butt joint manner. The phase change material dispensing terminal 303 includes a plurality of first injection ports; the first injection ports are connected to the phase change material filling channel 204 in a butt joint manner.

[0044] Specifically, as Figure 4 shown, a plurality of phase change material injection ports 401 are provided on the side surface of the liquid inlet end of the hybrid cooling tube. The phase change material injection ports 401 are connected to the phase change material dispensing terminal 303 in a butt joint manner. A phase change material dispensing terminal injection port 402 is provided on the phase change material dispensing terminal 303; when filling the phase change material into the phase change material filling channel 204, the phase change material is injected into the phase change material dispensing terminal 303 through the phase change material dispensing terminal injection port 402, and then is injected into the phase change material filling channel 204 through the phase change material injection ports 401.

[0045] Compared with the prior art, the present invention sets a plurality of phase change material filling channels 204 and fills the phase change material therein, and uses the phase change material and the coolant for hybrid cooling because when the phase change material cools, its heat exchange uniformity is good and no external power supply is required; the hybrid cooling of the two can ensure the uniformity of heat exchange in the battery pack.

[0046] Exemplarily, the phase change material dispensing terminal 303 and the phase change material converging terminal of the present invention have the same structure. Both are in the shape of a rectangular prism column and are both arranged along the width direction of the hybrid cooling tube. The interiors of the phase change material dispensing terminal 303 and the bus bar terminal 205 are hollow structures, and both are provided with terminal holes. The number of terminal holes is equal to the number of phase change material filling channels 204, and the terminal holes are connected to the phase change material injection ports 401 in a butt joint manner.

[0047] In order to facilitate the filling and potting of the phase change material, the present invention is provided with an exhaust terminal at the outlet end of the phase change material filling channel 204. The exhaust terminal is provided with a third exhaust port. The inner wall of the third exhaust port is provided with a threaded structure, and a third bolt is installed in the third exhaust port. In addition, the inner wall of the phase change material dispensing terminal injection port 402 is also provided with a threaded structure, and a fourth bolt can be installed in the phase change material dispensing terminal injection port 402. After injecting the phase change material into the phase change material filling channel 204, the phase change material dispensing terminal injection port 402 is blocked by the fourth bolt.

[0048] Specifically, the third exhaust port of the exhaust terminal is communicated with each phase change material filling channel 204. After filling the phase change material, the third exhaust port can be blocked by the third bolt; at the same time, the phase change material dispensing terminal injection port 402 is blocked by the fourth bolt to complete the filling of the phase change material.

[0049] Compared with the prior art, the present invention can accelerate the discharge of gas by providing a third exhaust port and an injection port 402 for the phase change material dispensing terminal; in addition, by using a third bolt to block the third exhaust port and a fourth bolt to block the injection port 402 for the phase change material dispensing terminal, the phase change material can be sealed in the corresponding channel, and the phase change material and the coolant are used for mixed cooling together to ensure the cooling efficiency and the uniformity of heat exchange.

[0050] It should be noted that the battery pack hybrid cooling plate of the present invention has a symmetrical structure with respect to its longitudinal geometric center; the battery pack hybrid cooling system has a symmetrical structure with respect to its longitudinal geometric center.

[0051] Compared with the prior art, both the battery pack hybrid cooling plate and the cooling system are set to have a symmetrical structure. The purpose is that the symmetrical structure enables the direct interchange of the liquid inlet and the liquid outlet of the coolant, making the overall structural design of the battery pack cooling system more flexible.

[0052] It should also be noted that the battery pack hybrid cooling plate of the present invention has a bent shape, for example, a continuous S-shaped shape. The bent battery pack hybrid cooling plate matches the layout design of the battery modules.

[0053] On the other hand, the present invention also provides a battery pack hybrid cooling system, including the above-mentioned battery pack hybrid cooling plate.

[0054] Specifically, the battery pack hybrid cooling system of the present invention includes a plurality of battery pack hybrid cooling plates, for example, the number is 2 to 5, and each battery pack hybrid cooling plate is arranged in parallel between the layers and on both sides of the battery module.

[0055] When using the above battery pack hybrid cooling system to cool the battery pack, the steps during assembly are as follows:

[0056] Step 1: Fill the phase change material filling channel 204 with the phase change material;

[0057] In the above Step 1, the phase change material is pre-heated to 40°C to become a fluid, the third exhaust port and the injection port 402 for the phase change material dispensing terminal are opened, and the fluid is filled into the phase change material filling channel 204 through the phase change material injection port 401. During the filling process, the air in the phase change material filling channel is expelled. After the filling is completed, the third exhaust port is blocked by a third bolt and the injection port 402 for the phase change material dispensing terminal is blocked by a fourth bolt to complete the filling of the phase change material.

[0058] Step 2: Assemble the battery pack cooling system;

[0059] Place the battery pack hybrid cooling plate in the interlayer between adjacent battery module columns and at the outer wall of the battery module column. The battery pack hybrid cooling plate is in close contact with the adjacent battery module column. That is, the two outermost battery pack hybrid cooling plates are in close contact with the outer wall of the outer battery module column, and the other battery pack hybrid cooling plates are arranged in the interlayer between the battery module columns and are in close contact with the battery module columns on both sides.

[0060] It should be noted that the phase change material of the present invention uses a mixture of paraffin and carbon nanotubes, compared with the mass ratio of paraffin and carbon nanotubes in the material of 1:1.

[0061] Exemplarily, in the above step 2, the liquid inlet of the liquid inlet manifold tube 101 and the liquid outlet of the liquid outlet manifold tube 103 of the hybrid cooling system are respectively connected to the liquid outlet and the liquid inlet of the liquid cooling device. During the operation of the hybrid cooling battery pack, coolant with corresponding flow rate and temperature is introduced, and heat exchange is carried out in combination with the phase change material and the battery pack to play a role in cooling.

[0062] It should be noted that when starting to pass the solution, the first bolt in the first exhaust port 302 and the second bolt in the second exhaust port can be loosened to accelerate the discharge of air.

[0063] In summary, by placing multiple hybrid cooling plates on both sides of the battery module, the present invention can uniformly cool the battery pack, ensure that the temperature at the water inlet of the battery cell is as consistent as possible with the temperature at the water outlet, and increase the service life of the battery pack.

[0064] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A battery pack hybrid cooling plate, characterized in that, It includes a cooling plate body; the cooling plate body includes a plurality of hybrid cooling tubes; The hybrid cooling tube includes a liquid distribution terminal, a liquid collection terminal, a liquid inlet pipe and a liquid outlet pipe; the liquid distribution terminal and the liquid collection terminal are arranged at both ends of the hybrid cooling tube, the liquid distribution terminal is butt-connected to the liquid inlet end of the hybrid cooling tube, and the liquid collection terminal is butt-connected to the liquid outlet end of the hybrid cooling tube; the liquid inlet pipe is connected to the liquid distribution terminal; the liquid collection terminal is connected to the liquid outlet pipe.

2. The battery pack hybrid cooling plate according to claim 1, wherein The structures of the plurality of hybrid cooling tubes are the same and are arranged in parallel; A plurality of liquid flow channels are provided on the hybrid cooling tube.

3. The hybrid cooling plate for a battery pack according to claim 2, wherein, A first exhaust port of the liquid flow channel is provided at the top of the liquid distribution terminal; a threaded structure is provided on the inner wall of the first exhaust port; a first bolt is installed in the first exhaust port.

4. The battery pack hybrid cooling plate according to claim 1, wherein, A second exhaust port is provided at the top of the liquid collection terminal; a threaded structure is provided on the inner wall of the second exhaust port; a second bolt is installed in the second exhaust port.

5. The battery pack hybrid cooling plate according to claim 2, wherein A plurality of phase change material filling channels are also provided on the hybrid cooling tube; the plurality of phase change material filling channels are arranged in parallel with the plurality of liquid flow channels.

6. The battery pack hybrid cooling plate according to claim 5, wherein, A phase change material dispensing terminal is also provided on the hybrid cooling tube; the phase change material dispensing terminal is arranged at the inlet end of the phase change material filling channel and is butt-connected thereto.

7. The battery pack hybrid cooling plate according to claim 6, characterized in that, A phase change material dispensing terminal injection port is provided on the phase change material dispensing terminal; the phase change material dispensing terminal injection port is butt-connected to the phase change material filling channel.

8. The battery pack hybrid cooling plate according to claim 6, characterized in that, An exhaust terminal is provided at the outlet end of the phase change material filling channel, and a third exhaust port is provided on the exhaust terminal. A threaded structure is provided on the inner wall of the third exhaust port, and a third bolt is installed in the third exhaust port.

9. The battery pack hybrid cooling plate according to claim 7, wherein, A threaded structure is provided on the inner wall of the phase change material dispensing terminal injection port, and a fourth bolt can be installed in the phase change material dispensing terminal injection port. After the phase change material is injected into the phase change material filling channel, the fourth bolt is used to block the phase change material dispensing terminal injection port.

10. A battery pack hybrid cooling system, characterized in that, It includes the battery pack hybrid cooling plate according to any one of claims 1 to 9.

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