A multi-package intelligent thermal management system with independent temperature control and flow control

Abstract

The present invention discloses a multi-pack intelligent thermal management system with independent temperature control and flow control, which belongs to the technical field of battery pack cooling, and comprises a primary water inlet pipe A, a primary water inlet pipe B, a water outlet pipe, a secondary water pipe, an electromagnetic control valve, a water outlet pipe electromagnetic control valve, a thermal management unit A and a thermal management unit B; one end of the primary water inlet pipe A and the primary water inlet pipe B are fixedly connected to the water outlet ends of the thermal management unit A and the thermal management unit B respectively, and one end of the water outlet pipe is divided into two branches and fixedly connected to the water inlet ends of the thermal management unit A and the thermal management unit B respectively; the present invention realizes independent temperature control and flow control for each battery sub-pack at low cost and low weight; when a single thermal management unit fails, the entire pack still does not lose the thermal management function, and can continue to ensure the safety of the power system; when encountering emergency conditions, it can respond to the thermal management needs of multiple battery sub-packs more quickly and intelligently.

Description

Technical Field

[0001] The present invention relates to the technical field of battery pack cooling, and in particular to a multi-pack intelligent thermal management system with independent temperature and flow control. Background Art

[0002] In the field of aircraft, for safety reasons, redundant backup is performed on the core power battery components to meet the reliability requirements of the entire power system. A common power system is composed of 3 to 10 battery sub-packs. If one of the battery sub-packs is lost, the aircraft can still land safely. Since aircraft are also very sensitive to weight, it is impossible to provide a separate thermal management unit for each battery sub-pack. A common solution is for one thermal management unit to provide liquid cooling and liquid heating for multiple battery sub-packs at the same time.

[0003] A thermal management unit provides liquid cooling and heating for multiple battery sub-packs at the same time. The coolant flow is controlled by the water pump of the thermal management unit. Since the temperature has only one value, all battery sub-packs can only accept the same temperature and the same water cooling flow at the same time. However, each battery sub-pack actually has a potential adaptive thermal management requirement, rather than passively accepting the same cooling strategy as other battery sub-packs or the worst battery sub-pack. The reason for this requirement is:

[0004] 1) The positions of multiple battery sub-packs on the aircraft are different, and the flow resistance from the thermal management unit to each battery sub-pack is different.

[0005] 2) There are differences in the length of the first-level water pipe between each battery sub-pack and the thermal management unit, and there are differences in the water cooling flow reaching each battery sub-pack.

[0006] 3) There are slight differences in the temperature environment of each battery sub-pack. If there are other heat sources near a battery sub-pack, this difference will be further exacerbated.

[0007] 4) There are differences in the consistency of the battery cells themselves, and this consistency difference will gradually widen as the battery is used.

[0008] 5) When the power of a battery sub-pack is interrupted, this battery sub-pack no longer needs liquid cooling. Instead, other battery sub-packs require more cooling flow support due to the increased power output required for emergency landing.

[0009] 6) When a battery sub-pack experiences thermal runaway, the battery sub-pack needs to be cooled down quickly to avoid thermal diffusion and more serious consequences. The battery sub-pack requires more cooling flow support.

[0010] Based on this, the present invention designs a multi-package intelligent thermal management system with independent temperature control and flow control to solve the above problems. Summary of the invention

[0011] In view of the above-mentioned shortcomings of the prior art, the present invention provides a multi-package intelligent thermal management system with independent temperature control and flow control.

[0012] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0013] A multi-package intelligent thermal management system with independent temperature control and flow control, comprising a primary water inlet pipe A, a primary water inlet pipe B, a water outlet pipe, a secondary water pipe, an electromagnetic control valve, an outlet water pipe electromagnetic control valve, a thermal management unit A and a thermal management unit B; the electromagnetic control valve and the outlet water pipe electromagnetic control valve are connected to a battery management system BMS; the thermal management unit A and the thermal management unit B communicate with the battery management system BMS;

[0014] One end of the primary water inlet pipe A and the primary water inlet pipe B are fixedly connected to the water outlet ends of the thermal management unit A and the thermal management unit B respectively, one end of the water outlet pipe is divided into two branches and fixedly connected to the water inlet ends of the thermal management unit A and the thermal management unit B respectively, and a water outlet pipe electromagnetic control valve is fixedly installed on the connecting branch between the thermal management unit B and the water outlet pipe;

[0015] The secondary water pipes include a secondary water pipe A, a secondary water pipe B, a secondary water pipe C and a secondary water pipe D; one end of a plurality of battery sub-packs is fixedly connected to one end of the secondary water pipe A and the secondary water pipe B through the secondary water pipe C, and the other ends of the secondary water pipe A and the secondary water pipe B are fixedly connected to the primary water inlet pipe A and the primary water inlet pipe B respectively; the other ends of the plurality of battery sub-packs are fixedly connected to the water outlet pipe through the secondary water pipe D;

[0016] The electromagnetic control valve comprises a first electromagnetic control valve and a second electromagnetic control valve; the first electromagnetic control valve and the second electromagnetic control valve are fixedly installed on the secondary water pipe A and the secondary water pipe B respectively.

[0017] Furthermore, when the maximum temperature difference e between the battery sub-packs satisfies: 0≤e<10°C, the electromagnetic control valve of the water outlet pipe is controlled to be closed; the first electromagnetic control valve above each battery sub-pack is opened, and the second electromagnetic control valve is closed.

[0018] Furthermore, when the maximum temperature difference e between the battery sub-packs satisfies: e≥10°C, the electromagnetic control valve of the water outlet pipe is controlled to open, and the first electromagnetic control valve and the second electromagnetic control valve above each battery sub-pack are opened.

[0019] Furthermore, thermal management unit A provides coolant A with a temperature of x°C, and thermal management unit B provides coolant B with a temperature of y°C; the flow rate of coolant A is controlled to be a L / min by the first solenoid control valve, and the flow rate of coolant B is controlled to be b L / min by the second solenoid control valve; then the final coolant flow rate passing through the battery sub-pack is a+b L / min, and the coolant temperature is (a*x+b*y) / (a+b)°C.

[0020] Furthermore, x=y.

[0021] Furthermore, the range of a is 0~10L / min, and the range of b is 0~10L / min.

[0022] Furthermore, when thermal management unit A or thermal management unit B fails:

[0023] If the thermal management unit A fails, the electromagnetic control valve of the water outlet pipe is controlled to open, the first electromagnetic control valve above the battery sub-pack is closed, and the second electromagnetic control valve is opened;

[0024] If thermal management unit B fails, the electromagnetic control valve of the water outlet pipe is controlled to be closed; the first electromagnetic control valve above the battery sub-pack is opened and the second electromagnetic control valve is closed.

[0025] Furthermore, when one of the battery sub-packs fails:

[0026] When one of the battery sub-packs loses power abnormally during flight, the electromagnetic control valve of the water outlet pipe is controlled to be closed, the first electromagnetic control valve above the battery sub-pack is closed, and the second electromagnetic control valve is closed, and the first electromagnetic control valves of the remaining battery sub-packs are opened and the second electromagnetic control valves are closed;

[0027] When one of the battery sub-packs experiences thermal runaway during flight, the solenoid control valve of the water outlet pipe is controlled to close, and the first solenoid control valve and the second solenoid control valve above the battery sub-pack are opened; the first solenoid control valves and the second solenoid control valves above the remaining battery sub-packs are opened and closed.

[0028] Compared with the prior art, the present invention has the following beneficial effects: 1. It realizes independent temperature and flow control for each battery sub-pack at low cost and low weight; 2. When a single thermal management unit fails, the entire pack still retains its thermal management function and can continue to ensure the safety of the power system; 3. When encountering emergency conditions, it can respond to the thermal management needs of multiple battery sub-packs more quickly and intelligently; for example: no longer providing cooling flow for battery sub-packs with power interruption, providing heat dissipation support with a larger cooling flow for the remaining battery sub-packs, further ensuring the safety of the battery system; for another example: providing as much cooling support as possible to the battery sub-packs that have thermal runaway, so as to achieve the purpose of rapid cooling and ensure that the thermal runaway battery sub-packs do not develop into severe thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 This is a structural diagram of a multi-package intelligent thermal management system with independent temperature control and flow control according to the present invention.

[0031] The numbers in the figure represent:

[0032] 1. First-level water inlet pipe A; 2. First-level water inlet pipe B; 3. Water outlet pipe; 4. Secondary water pipe; 5. Solenoid control valve; 6. Water outlet pipe solenoid control valve. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Embodiment 1: In some embodiments, please refer to the drawings of the specification Figure 1 , a multi-package intelligent thermal management system with independent temperature control and flow control, comprising a primary water inlet pipe A1, a primary water inlet pipe B2, a water outlet pipe 3, a secondary water pipe 4, an electromagnetic control valve 5, a water outlet pipe electromagnetic control valve 6, a thermal management unit A and a thermal management unit B;

[0035] The electromagnetic control valve 5 and the water outlet pipe electromagnetic control valve 6 are connected to the battery management system BMS; the opening and closing of the electromagnetic control valve 5 and the water outlet pipe electromagnetic control valve 6 are intelligently controlled by the battery management system BMS (battery management system);

[0036] Thermal management unit A and thermal management unit B can be any thermal management unit model available on the market. The key selection parameters are as follows:

[0037] With flow control function, it can provide 0~50L / min adjustable flow rate, and the flow accuracy meets <±0.3L / min;

[0038] With flow monitoring function, the monitoring accuracy meets ±0.02L / min;

[0039] With temperature control function, it can provide flow rate within the temperature range of 0~60℃, and the temperature accuracy meets the requirement of <±0.5℃;

[0040] With temperature detection function, the monitoring accuracy meets ±0.2℃;

[0041] It has communication function and can communicate with the battery management system BMS (battery management system) to achieve intelligent control.

[0042] One end of the primary water inlet pipe A1 and the primary water inlet pipe B2 are fixedly connected to the water outlet ends of the thermal management unit A and the thermal management unit B, respectively. One end of the water outlet pipe 3 is divided into two branches, which are fixedly connected to the water inlet ends of the thermal management unit A and the thermal management unit B, respectively. The connection branch between the thermal management unit B and the water outlet pipe 3 is fixedly installed with a water outlet pipe electromagnetic control valve 6;

[0043] The secondary water pipe 4 includes a secondary water pipe A401, a secondary water pipe B402, a secondary water pipe C403 and a secondary water pipe D404; one end of a plurality of battery sub-packs (PACKs) is fixedly connected to one end of the secondary water pipe A401 and the secondary water pipe B402 through the secondary water pipe C403, and the other ends of the secondary water pipes A401 and B402 are fixedly connected to the primary water inlet pipe A1 and the primary water inlet pipe B2 respectively; the other ends of a plurality of battery sub-packs (PACKs) are fixedly connected to the water outlet pipe 3 through the secondary water pipe D404;

[0044] The electromagnetic control valve 5 comprises a first electromagnetic control valve 501 and a second electromagnetic control valve 502 ; the first electromagnetic control valve 501 and the second electromagnetic control valve 502 are fixedly installed on the secondary water pipe A401 and the secondary water pipe B402 , respectively.

[0045] The present invention relates to two thermal management units, all battery subpacks share two primary water inlet pipes (primary water inlet pipe A1, primary water inlet pipe B2), and share one water outlet pipe 3; each battery subpack is equipped with a set of secondary water pipes 4, each secondary water pipe 4 is designed in a Y shape, and an electromagnetic control valve is installed on each branch before the Y-shaped confluence, and the electromagnetic control valve can control the opening, and the opening range is adjustable, the minimum is fully closed, the liquid cooling flow is 0L / min, and the maximum is fully open, and the liquid cooling flow is the highest liquid cooling flow that the branch design can pass. By controlling the opening of the two electromagnetic control valves, the confluence of coolants with different temperatures and different flows can be achieved, thereby achieving the purpose of providing an adaptive thermal management solution for each battery subpack.

[0046] Embodiment 2: In some embodiments, a multi-package intelligent thermal management method with independent temperature control and flow control includes:

[0047] S1: When the maximum temperature difference e between the battery sub-packs (PACK) satisfies: 0≤e<10°C, the electromagnetic control valve 6 of the water outlet pipe is controlled to be closed; the first electromagnetic control valve 501 above each battery sub-pack (PACK) is opened, and the second electromagnetic control valve 502 is closed;

[0048] The temperature of each battery sub-pack is monitored by the battery management system BMS, and the maximum temperature difference e between the battery sub-packs (PACK) is obtained.

[0049] At this time, only thermal management unit A is used to provide liquid cooling and liquid heating for the battery, and thermal management unit B is in standby mode.

[0050] S2: When the maximum temperature difference e between the battery sub-packs (PACKs) satisfies: e ≥ 10°C, the electromagnetic control valve 6 of the water outlet pipe is controlled to open, and the first electromagnetic control valve 501 and the second electromagnetic control valve 502 above each battery sub-pack (PACK) are opened;

[0051] Thermal management unit A provides coolant A with a temperature of x°C, and thermal management unit B provides coolant B with a temperature of y°C; the flow rate of coolant A is controlled to be a L / min through the first electromagnetic control valve 501, and the flow rate of coolant B is controlled to be b L / min through the second electromagnetic control valve 502; the final coolant flow rate passing through the battery sub-pack (PACK) is a+b L / min, and the coolant temperature is (a*x+b*y) / (a+b)°C;

[0052] Preferably, x=y;

[0053] Preferably, the range of a is 0-10 L / min, and the range of b is 0-10 L / min.

[0054] The first solenoid control valve 501 and the second solenoid control valve 502 above each battery sub-pack (PACK) can be adjusted to adjust the coolant flow through the battery sub-pack (PACK), so as to achieve flow and liquid cooling and heating temperature control of different battery sub-packs (PACK).

[0055] S3: When thermal management unit A or thermal management unit B fails:

[0056] If the thermal management unit A fails, the electromagnetic control valve 6 of the water outlet pipe is controlled to open, the first electromagnetic control valve 501 above the battery sub-pack (PACK) is closed, and the second electromagnetic control valve 502 is opened.

[0057] If the thermal management unit B fails, the electromagnetic control valve 6 of the water outlet pipe is controlled to be closed; the first electromagnetic control valve 501 above the battery sub-pack (PACK) is opened and the second electromagnetic control valve 502 is closed.

[0058] S4: When one of the battery packs (PACK) fails:

[0059] (a) When one of the battery sub-packs (e.g. PACK1) is abnormally powered off (power interrupted) during flight, the solenoid control valve 6 of the water outlet pipe is controlled to be closed, the first solenoid control valve 501 above PACK1 is closed, and the second solenoid control valve 502 is closed, and the first solenoid control valve 501 of the remaining battery sub-packs (PACK) is opened, and the second solenoid control valve 502 is closed;

[0060] Because PACK1 no longer needs cooling, the remaining battery sub-packs (PACKs) need to provide the power required for emergency landing. Due to the loss of a battery pack, the power demand increases compared to normal operating conditions. The remaining battery sub-packs (PACKs) receive heat dissipation support with a larger cooling flow, further ensuring the safety of the battery system.

[0061] (b) When one of the battery sub-packs (e.g. PACK1) experiences thermal runaway during flight, the outlet water pipe electromagnetic control valve 6 is controlled to be closed, the first electromagnetic control valve 501 and the second electromagnetic control valve 502 above PACK1 are opened; the first electromagnetic control valves 501 above the remaining battery sub-packs (PACK) are opened, and the opening degree ensures that the battery does not exceed the set safety threshold (i.e. the battery cell does not exceed the maximum operating temperature specified by the manufacturer), and the second electromagnetic control valve 502 is closed;

[0062] By providing as much cooling support as possible to the battery sub-packs experiencing thermal runaway, rapid cooling can be achieved to avoid more serious damage.

[0063] The present invention has the following advantages:

[0064] 1) Low cost and low weight enable each battery sub-pack to have independent temperature and flow control;

[0065] 2) When a single thermal management unit fails, the entire package still retains its thermal management function and can continue to ensure the safety of the power system;

[0066] 3) When encountering emergency conditions, it can respond to the thermal management needs of multiple battery sub-packs more quickly and intelligently;

[0067] For example, cooling flow is no longer provided for the battery sub-packs with power interruption, and a larger cooling flow is provided for the remaining battery sub-packs to further ensure the safety of the battery system.

[0068] Another example: provide as much cooling support as possible to the battery sub-pack that has thermal runaway, so as to achieve the purpose of rapid cooling and ensure that the thermal runaway battery sub-pack does not develop into severe thermal runaway.

[0069] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements 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 the present invention.

Claims

1. A multi-package intelligent thermal management system with independent temperature control and flow control, characterized in that: It comprises a primary water inlet pipe A (1), a primary water inlet pipe B (2), a water outlet pipe (3), a secondary water pipe (4), an electromagnetic control valve (5), an outlet pipe electromagnetic control valve (6), a thermal management unit A and a thermal management unit B; the electromagnetic control valve (5) and the outlet pipe electromagnetic control valve (6) are connected to a battery management system BMS; the thermal management unit A and the thermal management unit B communicate with the battery management system BMS; One end of the primary water inlet pipe A (1) and the primary water inlet pipe B (2) are fixedly connected to the water outlet ends of the thermal management unit A and the thermal management unit B, respectively; one end of the water outlet pipe (3) is divided into two branches, which are fixedly connected to the water inlet ends of the thermal management unit A and the thermal management unit B, respectively; and a water outlet pipe electromagnetic control valve (6) is fixedly installed on the connecting branch between the thermal management unit B and the water outlet pipe (3); The secondary water pipe (4) comprises a secondary water pipe A (401), a secondary water pipe B (402), a secondary water pipe C (403) and a secondary water pipe D (404); one end of a plurality of battery sub-packs is fixedly connected to one end of the secondary water pipe A (401) and the secondary water pipe B (402) via the secondary water pipe C (403), and the other ends of the secondary water pipe A (401) and the secondary water pipe B (402) are fixedly connected to the primary water inlet pipe A (1) and the primary water inlet pipe B (2) respectively; the other ends of the plurality of battery sub-packs are fixedly connected to the water outlet pipe (3) via the secondary water pipe D (404); The electromagnetic control valve (5) comprises a first electromagnetic control valve (501) and a second electromagnetic control valve (502); the first electromagnetic control valve (501) and the second electromagnetic control valve (502) are fixedly mounted on the secondary water pipe A (401) and the secondary water pipe B (402), respectively; When the maximum temperature difference e between the battery sub-packs satisfies: 0≤e<10°C, the electromagnetic control valve (6) of the water outlet pipe is controlled to be closed; the first electromagnetic control valve (501) above each battery sub-pack is opened, and the second electromagnetic control valve (502) is closed; When the maximum temperature difference e between the battery sub-packs satisfies: e≥10°C, the water outlet pipe electromagnetic control valve (6) is controlled to open, and the first electromagnetic control valve (501) and the second electromagnetic control valve (502) above each battery sub-pack are opened.

2. The multi-package intelligent thermal management system with independent temperature control and flow control according to claim 1 is characterized in that: Thermal management unit A provides coolant A at a temperature of x°C, and thermal management unit B provides coolant B at a temperature of y°C; the flow rate of coolant A is controlled to be a L / min by the first electromagnetic control valve (501), and the flow rate of coolant B is controlled to be b L / min by the second electromagnetic control valve (502); the final coolant flow rate passing through the battery sub-pack is a+b L / min, and the coolant temperature is (a*x+b*y) / (a+b)°C.

3. The multi-package intelligent thermal management system with independent temperature control and flow control according to claim 2 is characterized in that: x=y.

4. The multi-package intelligent thermal management system with independent temperature control and flow control according to claim 3 is characterized in that: The range of a is 0~10L / min, and the range of b is 0~10L / min.

5. The multi-package intelligent thermal management system with independent temperature control and flow control according to claim 4 is characterized in that: When thermal management unit A or thermal management unit B fails: If the thermal management unit A fails, the water outlet pipe electromagnetic control valve (6) is controlled to open, the first electromagnetic control valve (501) above the battery sub-pack is closed, and the second electromagnetic control valve (502) is opened; If the thermal management unit B fails, the electromagnetic control valve (6) of the water outlet pipe is controlled to be closed; the first electromagnetic control valve (501) above the battery sub-pack is opened, and the second electromagnetic control valve (502) is closed.

6. The multi-pack intelligent thermal management system with independent temperature control and flow control according to claim 5 is characterized in that: When one of the battery sub-packs fails: When one of the battery sub-packs is abnormally powered off during flight, the water outlet pipe electromagnetic control valve (6) is controlled to be closed, the first electromagnetic control valve (501) above the battery sub-pack is closed, and the second electromagnetic control valve (502) is closed, and the first electromagnetic control valves (501) of the remaining battery sub-packs are opened and the second electromagnetic control valves (502) are closed; When one of the battery sub-packs experiences thermal runaway during flight, the water outlet pipe electromagnetic control valve (6) is controlled to close, and the first electromagnetic control valve (501) and the second electromagnetic control valve (502) above the battery sub-pack are opened; the first electromagnetic control valves (501) and the second electromagnetic control valves (502) above the remaining battery sub-packs are opened and closed.

Images