Flow control system with pressure compensation and battery module

Abstract

The utility model relates to the technical field of battery packs, in particular to a flow control system with pressure compensation and a battery module, the system can be applied to a battery pack cluster, the battery pack cluster comprises a plurality of battery packs, and the battery packs are sequentially stacked together from bottom to top in the preset direction. The flow control system with the pressure compensation function comprises a liquid storage device, a pump body, a first conveying pipeline, a flow dividing pipeline, a first flow dividing and collecting valve, a second flow dividing and collecting valve, a converging pipeline and a second conveying pipeline. In a whole cluster system composed of a plurality of battery packs, valves with pressure compensation are additionally arranged at inlets and outlets of cooling liquid of the battery packs, and pressure loss in front of and behind the valves is controlled, so that fluid flows of the battery packs are consistent, particularly, the fluid flows of the uppermost battery pack and the lowermost battery pack are consistent, namely, the heat taken away by the cooling liquid is the same; and the temperature difference of each battery pack is reduced, the temperature field consistency of the whole cluster of battery packs with different heights is ensured, and the cycle life of the battery is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a flow control system and a battery module containing pressure compensation. Background Art

[0002] At present, immersion liquid-cooled battery packs use coolant flowing in the battery pack to remove the Joule heat generated by the battery. Battery packs using this cooling method have good cooling effect and high temperature consistency of each cell in the battery pack, thereby increasing the service life of the battery. However, when multiple battery packs are arranged in clusters along the vertical direction, due to the height and weight of the coolant, there is a very large liquid pressure in the topmost and bottommost battery packs in the entire cluster system. Since the liquid pressure of the bottommost battery pack is greater than the liquid pressure of the topmost battery pack, the fluid flow rate of the bottommost battery pack is greater than the fluid flow rate of the topmost battery pack, and then the fluid flow rate of the bottommost battery pack is greater than the fluid flow rate of the topmost battery pack. The heat removed by the fluid of the bottommost battery pack is greater than the heat removed by the fluid of the topmost battery pack, which is manifested as the temperature of the bottommost battery pack is lower than that of the topmost battery pack, and the battery packs in the middle show a temperature gradient change trend, thereby widening the temperature difference of the entire cluster battery system. Utility Model Content

[0003] The purpose of the present application is to provide a flow control system and a battery module with pressure compensation, which to a certain extent solves the technical problem in the prior art that when multiple battery packs are arranged in clusters in the vertical direction, the temperature of the battery pack at the bottom is lower than that of the battery pack at the top, and the battery packs in the middle show a temperature gradient change trend, thereby widening the temperature difference of the entire cluster battery system.

[0004] The present application provides a flow control system with pressure compensation, which is applied to a battery pack cluster, wherein the battery pack cluster includes a plurality of battery packs, and the plurality of battery packs are stacked together in sequence from bottom to top along a preset direction, and the flow control system with pressure compensation includes: a liquid storage device, a pump body, a first delivery pipeline, a shunt pipeline, a first shunt and collector valve, a second shunt and collector valve, a merging pipeline, and a second delivery pipeline; wherein the first delivery pipeline and the second delivery pipeline are respectively connected to the liquid storage device, and at least one of the two is provided with a pump body; along the preset direction and from bottom to top, the plurality of battery packs are divided into m groups of battery packs, and each group of battery packs contains n batteries, wherein m is a positive integer greater than or equal to 2, and n is a positive integer greater than or equal to 1;

[0005] When n≥2, the corresponding battery pack group is equipped with a corresponding one of the shunt pipelines and one of the first shunt collecting valves, the inlet end of the shunt pipeline is connected to the first delivery pipeline; the first shunt collecting valve has an inlet end and n outlet ends, the inlet end of the first shunt collecting valve is connected to the outlet end of the shunt pipeline, and the n outlet ends of the first shunt collecting valve are connected to the inlet ends of the n battery packs corresponding to each other;

[0006] When n=1, the corresponding battery pack group is equipped with one shunt pipeline and one converging pipeline, and the inlet end of the battery pack in the battery pack group is connected to the first delivery pipeline through the shunt pipeline, and the outlet end of the battery pack in the battery pack group is connected to the second delivery pipeline through the shunt pipeline;

[0007] Two battery packs located in different groups and adjacent to each other are provided with a corresponding merging pipeline and a second diverter and collector valve, and the second diverter and collector valve has two inlet ends and one outlet end, the two inlet ends of the second diverter and collector valve are connected with the outlet ends of the two corresponding battery packs, the outlet end of the second diverter and collector valve is connected with the corresponding merging pipeline, the outlet ends of the remaining battery packs are also provided with a merging pipeline, and all the merging pipelines are connected with the second delivery pipeline.

[0008] In the above technical solution, further, along the preset direction and from bottom to top, every two battery packs form a group of battery packs, and correspondingly, the first flow diverter and collector valve has an inlet port and two outlet ports.

[0009] In any of the above technical solutions, further, the flow control system with pressure compensation also includes a flow sensor, and the flow sensor is provided on the pipeline connected between the outlet end of any first diversion and collecting valve and the corresponding inlet end of the battery pack and on the diversion pipeline directly connected to the battery pack.

[0010] In any of the above technical solutions, further, the flow control system with pressure compensation also includes a first temperature sensor, and the outlet end of any of the battery packs is provided with the first temperature sensor for detecting the temperature of the outflowing coolant.

[0011] In any of the above technical solutions, further, the flow control system with pressure compensation also includes a pressure sensor, and the pressure sensor is provided on the pipeline connected between the outlet end of any first diversion and collecting valve and the corresponding inlet end of the battery pack and on the diversion pipeline directly connected to the battery pack.

[0012] In any of the above technical solutions, further, the flow control system with pressure compensation also includes a control device, and the control device is communicatively connected with the flow sensor, the temperature sensor and the pressure sensor.

[0013] In any of the above technical solutions, further, the flow control system with pressure compensation also includes a display device and a warning device, and the display device and the warning device are respectively communicatively connected with the control device.

[0014] In any of the above technical solutions, further, the first delivery pipeline is provided with the pump body, and the pump body is arranged close to the liquid storage device.

[0015] The present application also provides a battery module, including a battery pack cluster and a flow control system with pressure compensation as described in any of the above technical solutions, wherein the battery pack cluster includes a plurality of battery packs stacked together in sequence from bottom to top along the preset direction. Therefore, all the beneficial technical effects of the flow control system with pressure compensation are not repeated here.

[0016] In any of the above technical solutions, further, the battery module also includes a second temperature sensor, and any of the battery packs is equipped with the second temperature sensor for detecting the temperature of the battery pack.

[0017] Compared with the prior art, the beneficial effects of this application are:

[0018] In a whole cluster system composed of multiple battery packs, flow valves with pressure compensation are added at the inlet and outlet of the battery pack coolant to control the pressure loss before and after the valve, so that the fluid flow of each battery pack is consistent, especially the fluid flow of the topmost battery pack and the bottommost battery pack is consistent, that is, the heat carried away by the coolant fluid is the same, thereby reducing the temperature difference of each battery pack, ensuring the consistency of the temperature field of each height battery pack in the whole cluster and improving the cycle life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the structure of a flow control system with pressure compensation provided in an embodiment of the present application;

[0021] Figure 2Another schematic diagram of the structure of a flow control system with pressure compensation provided in an embodiment of the present application;

[0022] Figure 3 Another structural schematic diagram of a flow control system with pressure compensation provided in an embodiment of the present application;

[0023] Figure 4 Another structural schematic diagram of a flow control system with pressure compensation provided in an embodiment of the present application;

[0024] Figure 5 Another structural schematic diagram of a flow control system with pressure compensation provided in an embodiment of the present application;

[0025] Figure 6 Another structural schematic diagram of a flow control system with pressure compensation provided in an embodiment of the present application;

[0026] Figure 7 Another structural schematic diagram of a flow control system with pressure compensation provided in an embodiment of the present application;

[0027] Figure 8 Another structural schematic diagram of a flow control system with pressure compensation provided in an embodiment of the present application.

[0028] Reference numerals:

[0029] 1-liquid storage device, 2-pump body, 3-first delivery pipeline, 4-diverter pipeline, 41-1 diverter pipeline, 42-2 diverter pipeline, 43-3 diverter pipeline, 5-first diverter collecting valve, 51-1 first diverter collecting valve, 52-2 first diverter collecting valve, 53-3 first diverter collecting valve, 6-second diverter collecting valve, 61-1 second diverter collecting valve, 62-2 Two-way diversion and collecting valve, second diversion and collecting valve No. 63-3, 7-merging pipeline, merging pipeline No. 71-1, merging pipeline No. 72-2, merging pipeline No. 73-3, merging pipeline No. 74-4, 8-second delivery pipeline, 9-battery pack, battery pack No. 91-1, battery pack No. 92-2, battery pack No. 93-3, battery pack No. 94-4, battery pack No. 95-5, battery pack No. 96-6. DETAILED DESCRIPTION

[0030] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0031] The components of the embodiments of the present application generally described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0032] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0033] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] Refer to the following Figures 1 to 8 A flow control system and a battery module with pressure compensation according to some embodiments of the present application are described.

[0036] Embodiment 1

[0037] See also Figure 1 As shown, an embodiment of the present application provides a flow control system with pressure compensation, which is applied to a battery pack cluster, wherein the battery pack cluster includes six battery packs 9, and the multiple battery packs 9 are stacked together in sequence from bottom to top along a preset direction;

[0038] The flow control system with pressure compensation includes: a liquid storage device 1, a pump body 2, a first delivery pipeline 3, a diversion pipeline 4, a first diversion and collection valve 5, a second diversion and collection valve 6, a merging pipeline 7 and a second delivery pipeline 8; wherein the first delivery pipeline 3 is connected to the liquid storage device 1 via the pump body 2, wherein preferably, the liquid storage device 1 can be used to store cooling liquid or other heat exchange liquid;

[0039] When the number of battery packs 9 is 6, along the preset direction and from bottom to top, every two battery packs 9 form a group of battery packs, that is, a total of 3 groups of battery packs are formed, and each group of battery packs contains 2 battery packs 9;

[0040] Each of the three battery packs is provided with a corresponding shunt pipeline 4 and a first shunt collecting valve 5, the inlet end of the shunt pipeline 4 is connected to the first delivery pipeline 3; the first shunt collecting valve 5 has an inlet end and two outlet ends, the inlet end of the first shunt collecting valve 5 is connected to the outlet end of the shunt pipeline 4, and the two outlet ends of the first shunt collecting valve 5 are connected to the inlet ends of the two corresponding battery packs 9;

[0041] That is to say, the No. 1 battery pack 91 and the No. 2 battery pack 92 are jointly equipped with a shunt pipeline 4, namely, the No. 1 shunt pipeline 41, and a first shunt collecting valve 5, namely, the No. 1 first shunt collecting valve 51. The outlet end of the No. 1 battery pack 91 and the inlet end of the No. 2 battery pack 92 correspond to and are connected with the two outlet ends of the No. 1 first shunt collecting valve 51 one by one, respectively, and the inlet end of the No. 1 first shunt collecting valve 51 is connected with the outlet end of the No. 1 shunt pipeline 41.

[0042] The No. 3 battery pack 93 and the No. 4 battery pack 94 are jointly equipped with a shunt pipeline 4, namely, the No. 2 shunt pipeline 42, and a first shunt collecting valve 5, namely, the No. 2 first shunt collecting valve 52. The outlet end of the No. 3 battery pack 93 and the inlet end of the No. 4 battery pack 94 correspond to and are connected with the two outlet ends of the No. 2 first shunt collecting valve 52, respectively, and the inlet end of the No. 2 first shunt collecting valve 52 is connected with the outlet end of the No. 2 shunt pipeline 42;

[0043] The No. 5 battery pack 95 and the No. 6 battery pack 96 are jointly equipped with a shunt pipeline 4, namely, the No. 3 shunt pipeline 43, and a first shunt collecting valve 5, namely, the No. 3 first shunt collecting valve 53. The outlet end of the No. 5 battery pack 95 and the inlet end of the No. 6 battery pack 96 correspond to and are connected with the two outlet ends of the No. 3 first shunt collecting valve 53, respectively. The inlet end of the No. 3 first shunt collecting valve 53 is connected with the outlet end of the No. 3 shunt pipeline 43.

[0044] In addition, for the above three groups of battery packs, two battery packs 9 located in different groups and adjacent to each other are equipped with a corresponding merging pipeline 7 and a second flow dividing and collecting valve 6, and the second flow dividing and collecting valve 6 has two inlet ends and one outlet end, and the two inlet ends of the second flow dividing and collecting valve 6 are connected to the outlet ends of the two corresponding battery packs 9, and the outlet end of the second flow dividing and collecting valve 6 is connected to the corresponding merging pipeline 7;

[0045] That is to say, the No. 2 battery pack 92 and the No. 3 battery pack 93 are jointly equipped with a merging pipeline 7, namely, the No. 1 merging pipeline 71, and a second flow dividing and collecting valve 6, namely, the No. 1 second flow dividing and collecting valve 61. The outlet end of the No. 2 battery pack 92 and the outlet end of the No. 3 battery pack 93 correspond to and are connected with the two inlet ends of the No. 1 second flow dividing and collecting valve 61, respectively, and the outlet end of the No. 1 second flow dividing and collecting valve 61 is connected with the inlet end of the No. 1 merging pipeline 71.

[0046] The No. 4 battery pack 94 and the No. 5 battery pack 95 are jointly equipped with a converging pipeline 7, namely, the No. 2 converging pipeline 72, and a second flow dividing and collecting valve 6, namely, the No. 2 second flow dividing and collecting valve 62. The outlet end of the No. 4 battery pack 94 and the outlet end of the No. 5 battery pack 95 correspond to and are connected with the two inlet ends of the No. 2 second flow dividing and collecting valve 62, respectively. The outlet end of the No. 2 second flow dividing and collecting valve 62 is connected with the inlet end of the No. 2 converging pipeline 72.

[0047] The outlet end of battery pack No. 1 91 is connected to the second delivery pipeline 8 via a merging pipeline 7, namely, merging pipeline No. 3 73 . Similarly, the outlet end of battery pack No. 6 96 is connected to the second delivery pipeline 8 via a merging pipeline 7, namely, merging pipeline No. 4 74 .

[0048] According to the structure described above, it can be known that when diverting, the fluid flows in from the middle inlet of the first diverter and collector valve 5 and flows out from its two outlets in a 1:1 ratio. When collecting, the directions are opposite, and the fluid flows in from the two inlets in a 1:1 ratio and flows out from the middle outlet. The existing first diverter and collector valve 5 and the second diverter and collector valve 6 are both equipped with three springs, which respectively play the role of pressure compensation in the diverting direction and pressure compensation in the collecting direction.

[0049] Based on this, it can be known that the first flow diversion and collection valve 51 of No. 1 controls the flow of the No. 1 battery pack 91 and the No. 2 battery pack 92 to perform a 1:1 diversion, that is, to ensure that the flow rate of the fluid in the two is equal, the first flow diversion and collection valve 52 of No. 2 controls the flow of the No. 3 battery pack 93 and the No. 4 battery pack 94 to perform a 1:1 diversion, that is, to ensure that the flow rate of the fluid in the two is equal, the first flow diversion and collection valve 53 of No. 3 controls the flow of the No. 5 battery pack 95 and the No. 6 battery pack 96 to perform a 1:1 diversion, that is, to ensure that the flow rate of the fluid in the two is equal, and the second flow diversion and collection valve 61 of No. 1 controls the flow of the No. 2 battery pack 91 and the No. 4 battery pack 94 to perform a 1:1 diversion, that is, to ensure that the flow rate of the fluid in the two is equal. Battery pack 92 and battery pack 3 93 perform 1:1 flow collection, that is, the flow rates of the fluids in the two are guaranteed to be equal. Second diversion and collecting valve No. 2 controls battery pack 4 94 and battery pack 5 95 to perform 1:1 flow collection, that is, the flow rates of the fluids in the two are guaranteed to be equal, thereby making the flow rates of the fluids in each battery pack 9 at different heights the same, thereby ensuring that the heat carried away by the fluids is the same, thereby reducing the temperature difference between the battery packs 9, ensuring the consistency of the temperature field of the battery packs 9 at all heights of the entire cluster, and improving the cycle life of the battery.

[0050] It should be noted that the number of battery packs 9 is not limited to 6, but can also be other even numbers, such as 2, 4 or more than 6, such as 8, 12, 16, etc., and can all be grouped according to the aforementioned 6 rules, that is, along the preset direction and from bottom to top, every two battery packs 9 are grouped as a group of battery packs. Correspondingly, each battery pack group is equipped with a corresponding shunt pipeline 4 and a first shunt collecting valve 5, and the inlet end of the shunt pipeline 4 is connected to the first delivery pipeline 3; the first shunt collecting valve 5 has an inlet end and 2 outlet ends, the inlet end of the first shunt collecting valve 5 is connected to the outlet end of the shunt pipeline 4, and the 2 The outlet ends are connected with the inlet ends of the two corresponding battery packs 9; the two battery packs 9 located in different groups and adjacent to each other are equipped with a corresponding merging pipeline 7 and a second diverter and collector valve 6, and the second diverter and collector valve 6 has two inlet ends and one outlet end, the two inlet ends of the second diverter and collector valve 6 are connected with the outlet ends of the two corresponding battery packs 9, the outlet end of the second diverter and collector valve 6 is connected with the corresponding merging pipeline 7, the outlet ends of the remaining battery packs 9 are also equipped with a merging pipeline 7, and all the merging pipelines 7 are connected with the second delivery pipeline 8. For details, please refer to the rule that the number of battery packs 9 is 6 for grouping design.

[0051] It should be noted that the first diverter and collector valve 5 and the second diverter and collector valve 6 are both structures commonly used in the prior art, and they can be used in both directions, diverting in the forward direction and collecting in the reverse direction. When used in the forward direction, for example, referring to the first diverter and collector valve 5, it has an inlet end and multiple outlet ends, namely, diverter ports, and can ensure that the flow rates of each outlet end are equal. When used in the reverse direction, for example, referring to the second diverter and collector valve 6, it has an outlet end and multiple inlet ends, namely, diverter ports. In other words, the inlet end when used in the reverse direction becomes the current outlet end, and the outlet end becomes the current inlet end.

[0052] In this embodiment, preferably, the flow control system with pressure compensation also includes a flow sensor, and the flow sensor is provided on the pipeline connected between the outlet end of any first diversion and collecting valve 5 and the corresponding inlet end of the battery pack 9 and on the diversion pipeline 4 directly connected to the battery pack 9.

[0053] According to the structure described above, a flow sensor is used to monitor whether the flow of the fluid flowing into each battery pack 9 is equal at all times. When it is found that the flow of the fluid flowing into a battery pack 9 is not equal, the first diversion and collection valve 5 or related pipelines are promptly inspected and repaired.

[0054] In this embodiment, preferably, the flow control system with pressure compensation further includes a first temperature sensor, and the outlet end of any battery pack 9 is provided with a first temperature sensor for detecting the temperature of the outflowing coolant.

[0055] According to the structure described above, the first temperature sensor is used to detect the temperature of the fluid flowing out of the battery pack 9, and then it is determined whether the heat taken away from the battery pack 9 is roughly equal, which plays a role in assisting in monitoring the cooling effect.

[0056] In this embodiment, preferably, the flow control system with pressure compensation also includes a pressure sensor, and a pressure sensor is provided on the pipeline connected between the outlet end of any first diversion and collecting valve 5 and the inlet end of the corresponding battery pack 9 and on the diversion pipeline 4 directly connected to the battery pack 9.

[0057] According to the structure described above, it can be known that the pressure sensor is used to constantly monitor the pressure of the fluid flowing into each battery pack 9 , thereby ensuring the working performance of the battery pack 9 .

[0058] In this embodiment, preferably, the flow control system with pressure compensation further comprises a control device, and the control device is communicatively connected with the flow sensor, the temperature sensor and the pressure sensor.

[0059] Further, preferably, the flow control system with pressure compensation also includes a display device and a warning device, and the display device and the warning device are respectively communicatively connected with the control device.

[0060] According to the structure described above, the data detected by the flow sensor, temperature sensor and pressure sensor can be transmitted to the control device, and the control device controls the display device to display the detection structure, so that the user can observe it clearly and clearly. Especially when a problem occurs, the control device can control the warning device to alarm to prompt the user, which is more intelligent and reliable.

[0061] Embodiment 2

[0062] See also Figure 5 As shown, an embodiment of the present application provides a flow control system with pressure compensation, which is applied to a battery pack cluster, wherein the battery pack cluster includes five battery packs 9, and the multiple battery packs 9 are stacked together in sequence from bottom to top along a preset direction, and the flow control system with pressure compensation includes: a liquid storage device 1, a pump body 2, a first delivery pipeline 3, a diversion pipeline 4, a first diversion and collection valve 5, a second diversion and collection valve 6, a merging pipeline 7 and a second delivery pipeline 8; wherein the first delivery pipeline 3 is connected to the liquid storage device 1 via the pump body 2;

[0063] When the number of battery packs 9 is 5, they are divided into 3 groups of battery packs along the preset direction and from bottom to top, and the first group of battery packs includes battery pack No. 1 91 and battery pack No. 2 92, the second group of battery packs includes battery pack No. 3 93 and battery pack No. 4 94, and the third group of battery packs includes battery pack No. 5 95, wherein the first group of battery packs and the second group of battery packs are respectively equipped with a corresponding shunt pipeline 4 and a first shunt collecting valve 5, and the inlet end of the shunt pipeline 4 is connected to the first delivery pipeline 3; the first shunt collecting valve 5 has an inlet end and two outlet ends, the inlet end of the first shunt collecting valve 5 is connected to the outlet end of the shunt pipeline 4, and the two outlet ends of the first shunt collecting valve 5 are connected to the inlet ends of the two corresponding battery packs 9;

[0064] That is to say, the No. 1 battery pack 91 and the No. 2 battery pack 92 are jointly equipped with a shunt pipeline 4, namely, the No. 1 shunt pipeline 41, and a first shunt collecting valve 5, namely, the No. 1 first shunt collecting valve 51. The inlet end of the No. 1 battery pack 91 and the inlet end of the No. 2 battery pack 92 correspond to and are connected with the two outlet ends of the No. 1 first shunt collecting valve 51 one by one, respectively, and the inlet end of the No. 1 first shunt collecting valve 51 is connected with the outlet end of the No. 1 shunt pipeline 41.

[0065] The No. 3 battery pack 93 and the No. 4 battery pack 94 are jointly equipped with a shunt pipeline 4, namely, the No. 2 shunt pipeline 42, and a first shunt collecting valve 5, namely, the No. 2 first shunt collecting valve 52. The inlet end of the No. 3 battery pack 93 and the inlet end of the No. 4 battery pack 94 correspond to and are connected with the two outlet ends of the No. 2 first shunt collecting valve 52 one by one, respectively, and the inlet end of the No. 2 first shunt collecting valve 52 is connected with the outlet end of the No. 2 shunt pipeline 42;

[0066] The No. 5 battery pack 95 is equipped with a shunt pipeline 4, namely, No. 3 shunt pipeline 43, the inlet end of the No. 3 shunt pipeline 43 is connected to the first delivery pipeline 3; the outlet end of the No. 3 shunt pipeline 43 is connected to the inlet end of the No. 5 battery pack 95;

[0067] In addition, for the above three groups of battery packs, two battery packs 9 located in different groups and adjacent to each other are equipped with a corresponding merging pipeline 7 and a second flow dividing and collecting valve 6, and the second flow dividing and collecting valve 6 has two inlet ends and one outlet end, and the two inlet ends of the second flow dividing and collecting valve 6 are connected to the outlet ends of the two corresponding battery packs 9, and the outlet end of the second flow dividing and collecting valve 6 is connected to the corresponding merging pipeline 7;

[0068] That is to say, the No. 2 battery pack 92 and the No. 3 battery pack 93 are jointly equipped with a merging pipeline 7, namely, the No. 1 merging pipeline 71, and a second flow dividing and collecting valve 6, namely, the No. 1 second flow dividing and collecting valve 61. The outlet end of the No. 2 battery pack 92 and the outlet end of the No. 3 battery pack 93 correspond to and are connected with the two inlet ends of the No. 1 second flow dividing and collecting valve 61, respectively, and the outlet end of the No. 1 second flow dividing and collecting valve 61 is connected with the inlet end of the No. 1 merging pipeline 71.

[0069] The No. 4 battery pack 94 and the No. 5 battery pack 95 are jointly equipped with a converging pipeline 7, namely, the No. 2 converging pipeline 72, and a second flow dividing and collecting valve 6, namely, the No. 2 second flow dividing and collecting valve 62. The outlet end of the No. 4 battery pack 94 and the outlet end of the No. 5 battery pack 95 correspond to and are connected with the two inlet ends of the No. 2 second flow dividing and collecting valve 62, respectively. The outlet end of the No. 2 second flow dividing and collecting valve 62 is connected with the inlet end of the No. 2 converging pipeline 72.

[0070] The outlet end of the No. 1 battery pack 91 is connected to the second delivery pipeline 8 via a merging pipeline 7, namely, the No. 3 merging pipeline 73.

[0071] According to the structure described above, it can be known that when diverting, the fluid flows in from the middle inlet of the first diverter and collector valve 5 and flows out from its two outlets in a 1:1 ratio. When collecting, the directions are opposite, and the fluid flows in from the two inlets in a 1:1 ratio and flows out from the middle outlet. The existing first diverter and collector valve 5 and the second diverter and collector valve 6 are both equipped with three springs, which respectively play the role of pressure compensation in the diverting direction and pressure compensation in the collecting direction.

[0072] Based on this, it can be known that the first diversion and collecting valve No. 1 51 controls battery pack No. 1 91 and battery pack No. 2 92 for 1:1 diversion, that is, to ensure that the flow rate of the fluid in the two is equal, the first diversion and collecting valve No. 2 52 controls battery pack No. 3 93 and battery pack No. 4 94 for 1:1 diversion, that is, to ensure that the flow rate of the fluid in the two is equal, and the second diversion and collecting valve No. 1 61 controls battery pack No. 2 92 and battery pack No. 3 93 for 1:1 collection, that is, to ensure that the flow rate of the fluid in the two is equal, and the second diversion and collecting valve No. 2 62 controls battery pack No. 4 94 and battery pack No. 5 95 for 1:1 collection, that is, to ensure that the flow rate of the fluid in the two is equal, thereby making the flow rate of the fluid in each battery pack 9 located at different heights the same, thereby ensuring that the heat carried away by the fluid is the same, thereby reducing the temperature difference of each battery pack 9, ensuring the consistency of the temperature field of the battery packs 9 at all heights of the entire cluster, and improving the cycle life of the battery.

[0073] It should be noted that the number of battery packs 9 is not limited to 5, but can also be other odd numbers, such as 3 or more than 5, such as 7, 9, 11, 13, etc. According to the rule of the aforementioned 5 battery packs 9, that is, along the preset direction and from bottom to top, every two battery packs 9 are grouped as a group of battery packs 9, and correspondingly, each battery pack 9 group is equipped with a corresponding shunt pipeline 4 and a first shunt collecting valve 5, and the inlet end of the shunt pipeline 4 is connected to the first delivery pipeline 3; the first shunt collecting valve 5 has an inlet end and two outlet ends, the inlet end of the first shunt collecting valve 5 is connected to the outlet end of the shunt pipeline 4, and the two outlet ends of the first shunt collecting valve 5 are connected to the inlet ends of the two corresponding battery packs 9; two battery packs 9 located in different groups and adjacent to each other are equipped with a corresponding merging pipeline 7 to And a second shunt collecting valve 6, and the second shunt collecting valve 6 has two inlet ends and one outlet end, the two inlet ends of the second shunt collecting valve 6 are connected with the outlet ends of two corresponding battery packs 9, the outlet end of the second shunt collecting valve 6 is connected with the corresponding merging pipeline 7, the outlet ends of the remaining battery packs 9 are also equipped with a merging pipeline 7, and all the merging pipelines 7 are connected with the second delivery pipeline 8; when the number of battery packs 9 included in the battery pack 9 group is one, the corresponding battery pack 9 group is equipped with a shunt pipeline 4 and a merging pipeline 7, and the inlet end of the battery pack 9 in the battery pack 9 group is connected with the first delivery pipeline 3 through the shunt pipeline 4, and the outlet end of the battery pack 9 in the battery pack 9 group is connected with the second delivery pipeline 8 through the shunt pipeline 4. For details, please refer to the rule that the number of battery packs 9 is 5 for grouping design.

[0074] The flow control system with pressure compensation also includes a flow sensor, a first temperature sensor, a pressure sensor, a control device, a display device and a warning device. For details, please refer to Example 1, which will not be described in detail here.

[0075] It should be noted that: it is not limited to the grouping structure in the first and second embodiments, and the number of battery packs 9 included in each group is not limited to two. Figure 2 As shown, when the number of battery packs 9 is six, battery pack No. 1 91, battery pack No. 2 92 and battery pack No. 3 93 can be grouped as one, battery pack No. 4 94, battery pack No. 5 95 and battery pack No. 6 96 can be grouped as one, for a total of two groups of battery packs, and the first flow dividing and collecting valve 5 provided for each group of battery packs has one inlet end and three outlet ends, and battery pack No. 3 93 and battery pack No. 4 94 share a second flow dividing and collecting valve 6, and the second flow dividing and collecting valve 6 has two inlet ends and one outlet end; Figure 3As shown, when the number of battery packs 9 is six, battery pack No. 1 91 and battery pack No. 2 92 can be the first group, battery pack No. 3 93, battery pack No. 4 94 and battery pack No. 5 95 can be the second group, and battery pack No. 6 96 can be a group by itself and the third group. The first flow dividing and collecting valve 5 equipped with the first group of battery packs 9 has one inlet end and two outlet ends. The first flow dividing and collecting valve 5 equipped with the first group of battery packs 9 has one inlet end and three outlet ends. The third group of batteries does not need to be equipped with the first flow dividing and collecting valve 5, but only needs to be equipped with a flow dividing pipeline 4.

[0076] like Figure 4 As shown, when the number of battery packs 9 is six, battery pack No. 1 91 and battery pack No. 2 92 can be made into the first group, and battery pack No. 3 93, battery pack No. 4 94, battery pack No. 5 95 and battery pack No. 6 96 can be made into the second group. The first flow diverter and collector valve 5 equipped with the first group of battery packs has one inlet port and two outlet ports, and the first flow diverter and collector valve 5 equipped with the second group of battery packs has one inlet port and four outlet ports.

[0077] like Figure 6 As shown, when the number of battery packs 9 is five, battery pack No. 1 91 to battery pack No. 4 94 can be made into the first group, and battery pack No. 5 95 can be made into the second group. The first group of battery packs is equipped with a first diverter and collector valve 5 having an inlet port and four outlet ports. Battery pack No. 5 95 does not need to be equipped with the first diverter and collector valve 5, but only needs to be equipped with a diverter pipeline 4.

[0078] like Figure 7 As shown, when the number of battery packs is five, battery pack No. 1 91 to battery pack No. 3 93 can also be made into the first group, and battery pack No. 4 94 and battery pack No. 5 95 can be made into the second group. The first flow diverter and collector valve 5 equipped with the first group of battery packs has one inlet port and three outlet ports, and the first flow diverter and collector valve 5 equipped with the second group of battery packs has one inlet port and two outlet ports.

[0079] like Figure 8 As shown, when the number of battery packs 9 is five, battery pack No. 1 91 can be the first group, battery packs No. 2 to 94 can be the second group, and battery pack No. 5 95 can be the third group. Battery pack No. 1 91 does not need to be equipped with the first diverter and collector valve 5, but only needs to be equipped with a diverter pipeline 4. The first diverter and collector valve 5 equipped with the second group of battery packs has an inlet port and three outlet ports. Battery pack No. 5 95 does not need to be equipped with the first diverter and collector valve 5, but only needs to be equipped with a diverter pipeline 4.

[0080] It can be seen that the grouping of battery packs 9 is diverse and not limited to the above, and can be designed according to actual needs. In addition, corresponding first flow dividing and collecting valves 5 need to be provided corresponding to the number of different battery packs 9 in each group.

[0081] In other words, as long as the following structure is satisfied:

[0082] Along the preset direction and from bottom to top, the multiple battery packs 9 are divided into m groups of battery packs 9, and each group of battery packs 9 contains n batteries, wherein m is a positive integer greater than or equal to 2, and n is a positive integer greater than or equal to 1;

[0083] When n≥2, the corresponding battery pack 9 is equipped with a corresponding shunt pipeline 4 and a first shunt collecting valve 5, and the inlet end of the shunt pipeline 4 is connected to the first delivery pipeline 3; the first shunt collecting valve 5 has an inlet end and n outlet ends, and the inlet end of the first shunt collecting valve 5 is connected to the outlet end of the shunt pipeline 4, and the n outlet ends of the first shunt collecting valve 5 are connected to the inlet ends of the n battery packs 9 corresponding to each other.

[0084] When n=1, the corresponding battery pack 9 group is equipped with a shunt pipeline 4 and a merging pipeline 7, and the inlet end of the battery pack 9 in the battery pack 9 group is connected to the first delivery pipeline 3 through the shunt pipeline 4, and the outlet end of the battery pack 9 in the battery pack 9 group is connected to the second delivery pipeline 8 through the shunt pipeline 4;

[0085] Two battery packs 9 located in different groups and adjacent to each other are equipped with a corresponding merging pipeline 7 and a second diverter and collector valve 6, and the second diverter and collector valve 6 has two inlet ends and one outlet end. The two inlet ends of the second diverter and collector valve 6 are connected to the outlet ends of the two corresponding battery packs 9, and the outlet end of the second diverter and collector valve 6 is connected to the corresponding merging pipeline 7. The outlet ends of the remaining battery packs 9 are also equipped with a merging pipeline 7, and all merging pipelines 7 are connected to the second delivery pipeline 8.

[0086] Embodiment 3

[0087] Embodiment 2 of the present application also provides a battery module, including a flow control system with pressure compensation as described in any one of the above-mentioned embodiments 1, and thus, has all the beneficial technical effects of the flow control system with pressure compensation, and the same technical features and beneficial effects are no longer repeated.

[0088] In this embodiment, preferably, Figures 1 to 8 As shown, the battery module further includes a battery pack cluster, and the battery pack cluster includes a plurality of battery packs 9 stacked together in sequence from bottom to top along a preset direction;

[0089] The first delivery pipeline 3 and the second delivery pipeline 8 are respectively connected to the liquid storage device 1, and at least one of the two is provided with a pump body 2; along the preset direction and from bottom to top, the plurality of battery packs 9 are divided into m groups of battery packs 9, and each group of battery packs 9 contains n batteries, wherein m is a positive integer greater than or equal to 2, and n is a positive integer greater than or equal to 1;

[0090] When n≥2, the corresponding battery pack 9 is equipped with a corresponding shunt pipeline 4 and a first shunt collecting valve 5, and the inlet end of the shunt pipeline 4 is connected to the first delivery pipeline 3; the first shunt collecting valve 5 has an inlet end and n outlet ends, and the inlet end of the first shunt collecting valve 5 is connected to the outlet end of the shunt pipeline 4, and the n outlet ends of the first shunt collecting valve 5 are connected to the inlet ends of the n battery packs 9 corresponding to each other.

[0091] When n=1, the corresponding battery pack 9 group is equipped with a shunt pipeline 4 and a merging pipeline 7, and the inlet end of the battery pack 9 in the battery pack 9 group is connected to the first delivery pipeline 3 through the shunt pipeline 4, and the outlet end of the battery pack 9 in the battery pack 9 group is connected to the second delivery pipeline 8 through the shunt pipeline 4;

[0092] Two battery packs 9 located in different groups and adjacent to each other are equipped with a corresponding merging pipeline 7 and a second diverter and collector valve 6, and the second diverter and collector valve 6 has two inlet ends and one outlet end. The two inlet ends of the second diverter and collector valve 6 are connected to the outlet ends of the two corresponding battery packs 9, and the outlet end of the second diverter and collector valve 6 is connected to the corresponding merging pipeline 7. The outlet ends of the remaining battery packs 9 are also equipped with a merging pipeline 7, and all merging pipelines 7 are connected to the second delivery pipeline 8.

[0093] According to the structure described above, in the whole cluster system composed of multiple battery packs 9, by adding a flow valve with pressure compensation at the coolant inlet and outlet of the battery pack 9, the pressure loss before and after the valve is controlled to make the fluid flow of each battery pack 9 consistent, especially the fluid flow of the topmost battery pack 9 and the bottommost battery pack 9 consistent, that is, the heat carried away by the coolant fluid is the same, thereby reducing the temperature difference of each battery pack 9, ensuring the consistency of the temperature field of each height battery pack 9 in the whole cluster, and improving the cycle life of the battery.

[0094] Furthermore, preferably, the battery module also includes a second temperature sensor, and any battery pack 9 is equipped with a second temperature sensor for detecting the temperature of the battery pack 9, so that it can be more intuitive to know whether each battery pack 9 is evenly cooled.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A flow control system with pressure compensation, applied to a battery pack cluster, wherein the battery pack cluster comprises a plurality of battery packs, and the plurality of battery packs are stacked together in sequence from bottom to top along a preset direction, characterized in that: The flow control system with pressure compensation comprises: a liquid storage device, a pump body, a first delivery pipeline, a shunt pipeline, a first shunt and collector valve, a second shunt and collector valve, a merging pipeline and a second delivery pipeline; wherein the first delivery pipeline and the second delivery pipeline are respectively connected to the liquid storage device, and at least one of the two is provided with a pump body; along the preset direction and from bottom to top, the plurality of battery packs are divided into m groups of battery packs, and each group of battery packs contains n batteries, wherein m is a positive integer greater than or equal to 2, and n is a positive integer greater than or equal to 1; When n≥2, the corresponding battery pack group is equipped with a corresponding one of the shunt pipelines and one of the first shunt collecting valves, the inlet end of the shunt pipeline is connected to the first delivery pipeline; the first shunt collecting valve has an inlet end and n outlet ends, the inlet end of the first shunt collecting valve is connected to the outlet end of the shunt pipeline, and the n outlet ends of the first shunt collecting valve are connected to the inlet ends of the n battery packs corresponding to each other; When n=1, the corresponding battery pack group is equipped with one shunt pipeline, and the inlet end of the battery pack in the battery pack group is connected to the first delivery pipeline through the shunt pipeline; Two battery packs located in different groups and adjacent to each other are provided with a corresponding merging pipeline and a second diverter and collector valve, and the second diverter and collector valve has two inlet ends and one outlet end, the two inlet ends of the second diverter and collector valve are connected with the outlet ends of the two corresponding battery packs, the outlet end of the second diverter and collector valve is connected with the corresponding merging pipeline, the outlet ends of the remaining battery packs are also provided with a merging pipeline, and all the merging pipelines are connected with the second delivery pipeline.

2. The flow control system with pressure compensation according to claim 1, characterized in that: Along the preset direction and from bottom to top, every two battery packs form a group of battery packs, and correspondingly, the first flow dividing and collecting valve has an inlet port and two outlet ports.

3. The flow control system with pressure compensation according to claim 1, characterized in that: The flow control system with pressure compensation also includes a flow sensor, which is provided on the pipeline connected between the outlet end of any first diversion and collection valve and the corresponding inlet end of the battery pack, as well as on the diversion pipeline directly connected to the battery pack.

4. The flow control system with pressure compensation according to claim 3, characterized in that: The flow control system with pressure compensation also includes a first temperature sensor, and the outlet end of any of the battery packs is provided with the first temperature sensor for detecting the temperature of the outflowing coolant.

5. The flow control system with pressure compensation according to claim 4, characterized in that: The flow control system with pressure compensation also includes a pressure sensor, and the pressure sensor is provided on the pipeline connected between the outlet end of any first diversion and collection valve and the corresponding inlet end of the battery pack and on the diversion pipeline directly connected to the battery pack.

6. The flow control system with pressure compensation according to claim 5, characterized in that: The flow control system with pressure compensation further comprises a control device, and the control device is communicatively connected with the flow sensor, the temperature sensor and the pressure sensor.

7. The flow control system with pressure compensation according to claim 6, characterized in that: The flow control system with pressure compensation also includes a display device and a warning device, and the display device and the warning device are respectively connected to the control device for communication.

8. The flow control system with pressure compensation according to any one of claims 1 to 7, characterized in that: The first delivery pipeline is provided with the pump body, and the pump body is arranged close to the liquid storage device.

9. A battery module, characterized in that: It comprises a battery pack cluster and a flow control system with pressure compensation as claimed in any one of claims 1 to 8; wherein the battery pack cluster comprises a plurality of battery packs stacked together in sequence from bottom to top along the preset direction.

10. The battery module according to claim 9, characterized in that: The battery module further includes a second temperature sensor, and any of the battery packs is equipped with the second temperature sensor for detecting the temperature of the battery pack.

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