Battery pack cooling liquid circulating device

Abstract

The utility model discloses a battery pack cooling liquid circulating device, which belongs to the technical field of battery pack cooling, and comprises a cooling liquid main inlet pipeline, the cooling liquid main inlet pipeline is connected with a plurality of circulating components, the circulating components are respectively connected with n battery packs, the plurality of circulating components are connected with a cooling liquid main outlet pipeline and a cooling liquid circulating gathering pipeline, through the mode, the first valve, the second valve, the third valve and the fourth valve are respectively controlled under different conditions to realize circulation or discharge of cooling liquid in the battery pack, so that heat of the thermal runaway battery pack is prevented from generating a heating chain reaction on normal batteries, and the thermal runaway risk is reduced; as the cooling liquid in the cooling liquid main inlet pipeline does not enter the thermal runaway battery packs any more, the flow of the cooling liquid in the normal battery packs is increased, the cooling effect is improved, and the cooling liquid discharged by most of the normal battery packs circularly flows into a few of the thermal runaway battery packs, so that more heat of the thermal runaway battery packs can be taken away relatively.

Description

Technical Field

[0001] This utility model relates to the field of battery pack cooling technology, specifically to a battery pack coolant circulation device. Background Technology

[0002] With the gradual development of electric vehicles, electric aircraft and other electromechanical products, the capacity of the battery systems that power them is getting larger and larger, and the number of battery packs is gradually increasing, forming multiple packs that jointly or independently power the motor. During the charging or power supply process of the battery pack, there is a possibility of thermal runaway of the battery pack due to factors such as overcharging or overheating of the cells. When the battery pack experiences thermal runaway, if there are design defects or no effective cooling method to control it, it may lead to a more serious chain reaction of thermal runaway.

[0003] For example, Chinese patent application CN205882124U discloses an integrated pipeline for battery pack coolant, which includes a main inlet pipe and several inlet branches for introducing coolant, and a main outlet pipe and several outlet branches for discharging coolant. It also includes a first integrated connector and a second integrated connector, which are injection molded together. The first integrated connector is connected to the downstream port of the main inlet pipe and the upstream port of the several inlet branches, respectively. The second integrated connector is connected to the upstream port of the main outlet pipe and the downstream port of the several outlet branches, respectively. The downstream ports of the several inlet branches are connected to the inlets of several water-cooled plates in the battery pack, respectively. The upstream ports of the several outlet branches are connected to the outlets of the several water-cooled plates, respectively.

[0004] However, when the battery pack coolant integrated pipeline is in use, if there is thermal runaway of the battery pack, the high temperature will gradually be transferred to the surrounding cells, and the heat cannot be dissipated outside the battery pack, which poses a risk of further thermal runaway of the battery pack.

[0005] Based on this, the present invention designs a battery pack coolant circulation device to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a battery pack coolant circulation device.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A battery pack coolant circulation device includes a main coolant inlet pipe.

[0009] The main coolant inlet pipe is connected to multiple circulation components, each of which is connected to n battery packs. The multiple circulation components are also connected to the main coolant outlet pipe and the main coolant circulation pipeline.

[0010] The circulation assembly includes a battery pack cooling system inlet, a battery pack cooling system outlet, a first transfer pipe, a second transfer pipe, a coolant circulation branch pipe, and a control valve. The main coolant inlet pipe is fixedly connected to the first transfer pipe via a pipe, the main coolant outlet pipe is fixedly connected to the second transfer pipe via a pipe, the coolant circulation summary pipe is fixedly connected to the second transfer pipe via a pipe, the coolant circulation summary pipe is fixedly connected to the coolant circulation branch pipe, the first transfer pipe is fixedly connected to the battery pack cooling system inlet and the coolant circulation branch pipe, and the second transfer pipe is fixedly connected to the battery pack cooling system outlet. The battery pack cooling system inlet is fixedly installed at the battery pack inlet, and the battery pack cooling system outlet is fixedly installed at the battery pack outlet. The control valve is connected to the main coolant inlet pipe, the main coolant outlet pipe, the coolant circulation summary pipe, the first transfer pipe, the second transfer pipe, and the coolant circulation branch pipe.

[0011] The control valves include a first valve, a second valve, a third valve, and a fourth valve. The first valve is fixedly installed between the main coolant inlet pipe and the first transfer pipe. The second valve is fixedly installed between the first transfer pipe and the coolant circulation outlet pipe. The third valve is fixedly installed between the coolant circulation main pipe and the second transfer pipe. The fourth valve is fixedly installed between the main coolant outlet pipe and the second transfer pipe.

[0012] Furthermore, the first transfer pipe and the second transfer pipe are tee pipes, each with three ports. The three ports of the first transfer pipe are respectively connected and fixedly connected to the main coolant inlet pipe, the battery pack cooling system inlet pipe, and the coolant circulation outlet pipe. The three ports of the second transfer pipe are respectively connected and fixedly connected to the main coolant outlet pipe, the coolant circulation collection pipe, and the battery pack cooling system outlet pipe.

[0013] Furthermore, the first valve, the second valve, the third valve, and the fourth valve are single-way valves. The flow direction of the first valve is from the main coolant inlet pipe to the first transfer pipe, the flow direction of the second valve is from the coolant circulation branch pipe to the first transfer pipe, the flow direction of the third valve is from the second transfer pipe to the coolant circulation main pipe, and the flow direction of the fourth valve is from the second transfer pipe to the main coolant outlet pipe.

[0014] Furthermore, when the n battery packs are operating normally, the first and fourth valves are in the open state, and the second and third valves are in the closed state. The coolant flows into the battery pack from the main coolant inlet pipe through the first transfer pipe and the battery pack cooling system inlet, and then flows into the main coolant outlet pipe from the battery pack through the battery pack cooling system outlet and the second transfer pipe.

[0015] Furthermore, when m battery packs are in a state of thermal runaway, the first and fourth valves of k battery packs in the normal battery pack are open, and the second and third valves are closed. The coolant flows into the battery pack from the main coolant inlet pipe through the first transfer pipe and the battery pack cooling system inlet, and then flows into the main coolant outlet pipe from the battery pack through the battery pack cooling system outlet and the second transfer pipe.

[0016] Furthermore, in the remaining normal battery packs, the first and third valves are open, and the second and fourth valves are closed. Coolant flows into the battery pack from the main coolant inlet pipe through the first transfer pipe and the battery pack cooling system inlet, and then flows into the coolant circulation main pipe from the battery pack through the battery pack cooling system outlet and the second transfer pipe. In the m thermal runaway battery packs, the second and fourth valves are open, and the first and third valves are closed. Coolant flows into the battery pack from the coolant circulation main pipe through the coolant circulation branch pipe, the first transfer pipe and the battery pack cooling system inlet, and then flows into the main coolant outlet pipe from the battery pack through the battery pack cooling system outlet and the second transfer pipe.

[0017] Furthermore, k=0.

[0018] Furthermore, k∈(0, n-2m).

[0019] Compared with the prior art, the advantages of this utility model are as follows: 1. By controlling the first valve, the second valve, the third valve and the fourth valve respectively under different conditions, the coolant in the battery pack can be circulated or discharged, so as to avoid the heat of the thermal runaway battery pack from causing a chain reaction of heating to the normal battery and reduce the risk of thermal runaway.

[0020] 2. Since the coolant in the main coolant inlet pipe no longer enters the thermal runaway battery pack, the coolant flow rate in the normal battery pack increases, the cooling effect is improved, and the coolant discharged from most of the normal battery packs circulates into the few thermal runaway battery packs, which can remove more heat from the thermal runaway battery packs.

[0021] 3. By draining some of the coolant from the normal battery pack into the main coolant outlet pipe, a large amount of coolant is prevented from rushing into the coolant circulation main pipe and the pipes corresponding to the thermal runaway battery pack, thus avoiding excessive flow and load. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a schematic diagram of the battery pack cooling circulation system of this utility model.

[0024] The labels in the diagram represent:

[0025] 1. Main coolant inlet pipe; 2. Main coolant outlet pipe; 3. Coolant circulation main pipe; 4. Battery pack cooling system inlet; 5. Battery pack cooling system outlet; 6. First transfer pipe; 7. Second transfer pipe; 8. Coolant circulation branch pipe; 9. Control valve; 91. First valve; 92. Second valve; 93. Third valve; 94. Fourth valve. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0027] Example 1: In some embodiments, please refer to the accompanying drawings. Figure 1 A battery pack coolant circulation device includes a main coolant inlet pipe 1.

[0028] The main coolant inlet pipe 1 is connected to multiple circulation components, each of which is connected to n battery packs. The multiple circulation components are connected to the main coolant outlet pipe 2 and the coolant circulation summary pipe 3.

[0029] The circulation assembly includes a battery pack cooling system inlet 4, a battery pack cooling system outlet 5, a first transfer pipe 6, a second transfer pipe 7, a coolant circulation branch pipe 8, and a control valve 9. The main coolant inlet pipe 1 is fixedly connected to the first transfer pipe 6 via a pipe. The main coolant outlet pipe 2 is fixedly connected to the second transfer pipe 7 via a pipe. The coolant circulation summary pipe 3 is fixedly connected to the second transfer pipe 7 via a pipe. The coolant circulation summary pipe 3 is fixedly connected to the coolant circulation branch pipe 8 via a pipe. The first transfer pipe 6 is fixedly connected to the battery pack cooling system inlet 4 and the coolant circulation branch pipe 8. The second transfer pipe 7 is fixedly connected to the battery pack cooling system outlet 5. The battery pack cooling system inlet 4 is fixedly installed at the battery pack inlet. The battery pack cooling system outlet 5 is fixedly installed at the battery pack outlet. The control valve 9 is connected to the main coolant inlet pipe 1, the main coolant outlet pipe 2, the coolant circulation summary pipe 3, the first transfer pipe 6, the second transfer pipe 7, and the coolant circulation branch pipe 8.

[0030] The control valve 9 includes a first valve 91, a second valve 92, a third valve 93, and a fourth valve 94. The first valve 91 is fixedly installed between the main coolant inlet pipe 1 and the first transfer pipe 6. The second valve 92 is fixedly installed between the first transfer pipe 6 and the coolant circulation outlet pipe 8. The third valve 93 is fixedly installed between the coolant circulation main pipe 3 and the second transfer pipe 7. The fourth valve 94 is fixedly installed between the main coolant outlet pipe 2 and the second transfer pipe 7.

[0031] When the battery pack coolant circulation device is in normal use, the coolant in the main coolant inlet pipe 1 enters the battery pack through the first transfer pipe 6 and the battery pack cooling system inlet 4. The coolant in the battery pack enters the coolant circulation main pipe 3 or the coolant circulation main pipe 3 through the battery pack cooling system outlet 5 and the second transfer pipe 7. The coolant in the coolant circulation main pipe 3 enters the battery pack through the coolant circulation branch pipe 8 and the first transfer pipe 6. By controlling the first valve 91, the second valve 92, the third valve 93 and the fourth valve 94 respectively under different conditions, the coolant in the battery pack is circulated or discharged, so as to avoid the heat of the thermal runaway battery pack from causing a chain reaction of heating to the normal batteries and reduce the risk of thermal runaway.

[0032] The first transfer pipe 6 and the second transfer pipe 7 are tee pipes. The first transfer pipe 6 and the second transfer pipe 7 are provided with three ports. The three ports of the first transfer pipe 6 are respectively connected to the main coolant inlet pipe 1, the battery pack cooling system inlet 4 and the coolant circulation outlet pipe 8. The three ports of the second transfer pipe 7 are respectively connected to the main coolant outlet pipe 2, the coolant circulation collection pipe 3 and the battery pack cooling system outlet 5.

[0033] The first valve 91, the second valve 92, the third valve 93 and the fourth valve 94 are single-way valves. The flow direction of the first valve 91 is from the main coolant inlet pipe 1 to the first transfer pipe 6. The flow direction of the second valve 92 is from the coolant circulation branch pipe 8 to the first transfer pipe 6. The flow direction of the third valve 93 is from the second transfer pipe 7 to the coolant circulation main pipe 3. The flow direction of the fourth valve 94 is from the second transfer pipe 7 to the main coolant outlet pipe 2.

[0034] When the n battery packs are operating normally, the first valve 91 and the fourth valve 94 are in the open state, the second valve 92 and the third valve 93 are in the closed state, and the coolant flows into the battery pack from the coolant main inlet pipe 1 through the first transfer pipe 6 and the battery pack cooling system inlet 4, and then flows into the coolant main outlet pipe 2 from the battery pack through the battery pack cooling system outlet 5 and the second transfer pipe 7.

[0035] When the battery pack coolant circulation device is in normal use, the coolant in the main coolant inlet pipe 1 enters the battery pack through the first transfer pipe 6 and the battery pack cooling system inlet 4, and then enters the main coolant outlet pipe 2 from the battery pack through the battery pack cooling system outlet 5 and the second transfer pipe 7. The coolant carries away the heat in the battery pack to achieve a cooling effect.

[0036] When m battery packs are in a thermal runaway state, the first valve 91 and the fourth valve 94 of the k battery packs in the normal battery pack are in the open state, and the second valve 92 and the third valve 93 are in the closed state. The coolant flows into the battery pack from the coolant main inlet pipe 1 through the first transfer pipe 6 and the battery pack cooling system inlet 4, and then flows into the coolant main outlet pipe 2 from the battery pack through the battery pack cooling system outlet 5 and the second transfer pipe 7.

[0037] For the remaining normal battery packs, the first valve 91 and the third valve 93 are open, and the second valve 92 and the fourth valve 94 are closed. Coolant flows into the battery pack from the main coolant inlet pipe 1 through the first transfer pipe 6 and the battery pack cooling system inlet 4, and then flows into the coolant circulation collection pipe 3 from the battery pack through the battery pack cooling system outlet 5 and the second transfer pipe 7. For the m thermal runaway battery packs, the second valve 92 and the fourth valve 94 are open, and the first valve 91 and the third valve 93 are closed. Coolant flows into the battery pack from the coolant circulation collection pipe 3 through the coolant circulation branch pipe 8, the first transfer pipe 6 and the battery pack cooling system inlet 4, and then flows into the main coolant outlet pipe 2 from the battery pack through the battery pack cooling system outlet 5 and the second transfer pipe 7.

[0038] As stated, k=0.

[0039] When the battery pack coolant circulation device is in normal use, the coolant in the main coolant inlet pipe 1 enters all normal battery packs and then enters the coolant circulation manifold pipe 3. The coolant in the main coolant circulation manifold pipe 3, carrying a certain amount of heat, enters the m thermal runaway battery packs, further removing heat before entering the main coolant outlet pipe 2. Since the coolant in the main coolant inlet pipe 1 no longer enters the thermal runaway battery packs, the coolant flow rate in the normal battery packs increases, improving the cooling effect. Furthermore, the coolant discharged from most of the normal battery packs circulates into the few thermal runaway battery packs, which can remove relatively more heat from the thermal runaway battery packs.

[0040] As stated, k∈(0, n-2m).

[0041] When the battery pack coolant circulation device is in normal use, the coolant in the k normal battery packs enters the main coolant outlet pipe 2, and the coolant in the remaining normal battery packs enters the coolant circulation collection pipe 3, thus circulating into the thermal runaway battery pack. This prevents a large amount of coolant from rushing into the coolant circulation collection pipe 3 and the pipes corresponding to the thermal runaway battery pack, which would cause excessive flow and load.

[0042] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery pack coolant circulation device, comprising a main coolant inlet pipe (1), characterized in that: The main coolant inlet pipe (1) is connected to multiple circulation components, which are respectively connected to n battery packs. The multiple circulation components are connected to the main coolant outlet pipe (2) and the coolant circulation summary pipe (3). The circulation assembly includes a battery pack cooling system inlet (4), a battery pack cooling system outlet (5), a first transfer pipe (6), a second transfer pipe (7), a coolant circulation branch pipe (8), and a control valve (9). The main coolant inlet pipe (1) is fixedly connected to the first transfer pipe (6) via a pipe. The main coolant outlet pipe (2) is fixedly connected to the second transfer pipe (7) via a pipe. The coolant circulation summary pipe (3) is fixedly connected to the second transfer pipe (7) via a pipe. The coolant circulation summary pipe (3) is fixedly connected to the coolant circulation branch pipe (8). The first transfer pipe (6) is fixedly connected to the battery pack cooling system inlet (4) and the coolant circulation outlet pipe (8), the second transfer pipe (7) is fixedly connected to the battery pack cooling system outlet (5), the battery pack cooling system inlet (4) is fixedly installed at the battery pack inlet, the battery pack cooling system outlet (5) is fixedly installed at the battery pack outlet, and the control valve (9) is connected to the coolant main inlet pipe (1), the coolant main outlet pipe (2), the coolant circulation summary pipe (3), the first transfer pipe (6), the second transfer pipe (7), and the coolant circulation outlet pipe (8); The control valve (9) includes a first valve (91), a second valve (92), a third valve (93) and a fourth valve (94). The first valve (91) is fixedly installed between the main coolant inlet pipe (1) and the first transfer pipe (6). The second valve (92) is fixedly installed between the first transfer pipe (6) and the coolant circulation outlet pipe (8). The third valve (93) is fixedly installed between the coolant circulation main pipe (3) and the second transfer pipe (7). The fourth valve (94) is fixedly installed between the main coolant outlet pipe (2) and the second transfer pipe (7).

2. The battery pack coolant circulation device according to claim 1, characterized in that, The first transfer pipe (6) and the second transfer pipe (7) are tee pipes. The first transfer pipe (6) and the second transfer pipe (7) are provided with three ports. The three ports of the first transfer pipe (6) are respectively connected to the main coolant inlet pipe (1), the battery pack cooling system inlet (4) and the coolant circulation outlet pipe (8). The three ports of the second transfer pipe (7) are respectively connected to the main coolant outlet pipe (2), the coolant circulation collection pipe (3) and the battery pack cooling system outlet (5).

3. The battery pack coolant circulation device according to claim 2, characterized in that, The first valve (91), the second valve (92), the third valve (93) and the fourth valve (94) are single-way valves. The first valve (91) flows from the main coolant inlet pipe (1) to the first transfer pipe (6). The second valve (92) flows from the coolant circulation branch pipe (8) to the first transfer pipe (6). The third valve (93) flows from the second transfer pipe (7) to the coolant circulation main pipe (3). The fourth valve (94) flows from the second transfer pipe (7) to the main coolant outlet pipe (2).

4. The battery pack coolant circulation device according to claim 3, characterized in that, When the n battery packs are operating normally, the first valve (91) and the fourth valve (94) are open, and the second valve (92) and the third valve (93) are closed. The coolant flows into the battery pack from the coolant main inlet pipe (1) through the first transfer pipe (6) and the battery pack cooling system inlet (4), and then flows into the coolant main outlet pipe (2) from the battery pack through the battery pack cooling system outlet (5) and the second transfer pipe (7).

5. The battery pack coolant circulation device according to claim 3, characterized in that, When m battery packs are in thermal runaway state, the first valve (91) and the fourth valve (94) of k battery packs in the normal battery pack are in the open state, and the second valve (92) and the third valve (93) are in the closed state. The coolant flows into the battery pack from the coolant main inlet pipe (1) through the first transfer pipe (6) and the battery pack cooling system inlet (4), and then flows into the coolant main outlet pipe (2) from the battery pack through the battery pack cooling system outlet (5) and the second transfer pipe (7).

6. The battery pack coolant circulation device according to claim 5, characterized in that, The first valve (91) and the third valve (93) of the remaining normal battery packs are in the open state, and the second valve (92) and the fourth valve (94) are in the closed state. The coolant flows into the battery pack from the coolant main inlet pipe (1) through the first transfer pipe (6) and the battery pack cooling system inlet (4), and then flows into the coolant circulation summary pipe (3) from the battery pack through the battery pack cooling system outlet (5) and the second transfer pipe (7). The second valve (92) and the fourth valve (94) of the m thermal runaway battery packs are in the open state, and the first valve (91) and the third valve (93) are in the closed state. The coolant flows into the battery pack from the coolant circulation summary pipe (3) through the coolant circulation branch pipe (8), the first transfer pipe (6) and the battery pack cooling system inlet (4), and then flows into the coolant main outlet pipe (2) from the battery pack through the battery pack cooling system outlet (5) and the second transfer pipe (7).

7. The battery pack coolant circulation device according to claim 6, characterized in that, The value of k is 0.

8. The battery pack coolant circulation device according to claim 6, characterized in that, k∈(0, n-2m).

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