Battery cooling plate and battery system

Abstract

The present disclosure provides a battery cooling plate and a battery system. The battery system comprises a battery and a battery cooling plate. The battery cooling plate comprises two external interfaces, two manifold pipes, and a plurality of branching sections; the two external interfaces each communicate with an intermediate position of the two manifold pipes, so that the flow path of the coolant within each manifold pipe becomes half the length of the manifold pipe, thereby reducing flow resistance along the path of the manifold pipe; the plurality of branching sections are arranged side by side, and two ends of each branching section each communicate with the two manifold pipes through a plurality of throttling ports; The total cross-sectional area of ​​multiple throttling ports in a branch closer to the external interface is smaller than the total cross-sectional area of ​​multiple throttling ports in a branch far from the external interface, and the lower branch has the same cross-sectional area, so that the flow resistance of the branch can be balanced, ensuring that the flow resistance of the branch is consistent, the flow rate of the coolant within the branch is balanced, the temperature of various parts of the cooling plate becomes uniform, the balance and efficiency of heat dissipation are improved, the power requirement of the system for the circulation pump is reduced, and the system cost is further reduced.

Description

Technology Field

[0001] Cross-reference regarding related applications

[0002] The present disclosure claims priority to Chinese patent application No. 202110741232.2, titled "BATTERY COLD PLATE AND BATTERY SYSTEM," filed on June 30, 2021. The entire contents of the aforementioned application are incorporated herein by reference.

[0003] The present disclosure relates to new energy battery heat dissipation technology, and more specifically, to battery cooling plates and battery systems. Background Technology

[0004] Currently, new energy battery heat dissipation systems are designed to incorporate air cooling, liquid cooling, and direct cooling methods. These various cooling methods achieve diverse heat exchange results. Liquid cooling is the most commonly used method today, and liquid cooling plates are primarily designed for this purpose. Currently, greater attention is being focused on the design of flow channels when designing cooling plates. As the power requirements and mileage range of battery systems continue to increase, battery pack sizes and cooling plate sizes are growing, leading to increased flow demands on the heat dissipation system. In current technology, the difference in flow resistance at the internal branching points of the cooling plate is significant; consequently, temperatures at various locations on the plate are uneven, resulting in poor heat dissipation balance. means of solving the problem

[0005] The present disclosure provides a battery cooling plate and a battery system. Temperature uniformity at various locations of the cooling plate can be improved, and heat dissipation balance and efficiency are improved.

[0006] In one embodiment, an embodiment of the present disclosure provides a battery cooling plate comprising two external interfaces, two convergence pipelines, and a plurality of branching sections.

[0007] Each convergence pipeline is arranged to extend along the first direction, and two external interfaces are each connected to an intermediate position of the two convergence pipelines in the first direction.

[0008] A plurality of branches are arranged side by side along a first direction and arranged between two convergence pipelines in a second direction. Both ends of each branch in the second direction are connected to two convergence pipelines through at least one throttling port. The first direction and the second direction are two directions orthogonal to each other. The total cross-sectional area of ​​the throttling ports in the branches closer to the external interface is smaller than the total cross-sectional area of ​​the throttling ports in the branches farther from the external interface.

[0009] A plurality of sub-branches are arranged in the branch along the first direction. Each sub-branch is arranged to extend along the second direction. The end portions of a plurality of sub-branches in the same branch are connected. The cross-sectional area of ​​all sub-branches is the same.

[0010] In the embodiment, the number of throttling ports in the branch closer to the external interface is less than the number of throttling ports in the branch farther from the external interface.

[0011] In the embodiment, the number of throttling ports in the branch close to the external interface is the same as the number of throttling ports in the branch far from the external interface.

[0012] The cross-sectional area of ​​various throttling ports is the same.

[0013] The cross-sectional area of ​​the throttling port in the branch closer to the external interface is smaller than the cross-sectional area of ​​the throttling port in the branch farther from the external interface.

[0014] The number of sub-branches within a branch closer to the external interface is greater than the number of sub-branches within a branch far from the external interface.

[0015] In the example, all sub-branches in all branches have the same cross-sectional area.

[0016] In an embodiment, the two external interfaces are the main inlet and the main outlet, respectively. The two convergence pipelines are the inlet convergence pipeline and the outlet convergence pipeline, respectively. The main inlet, the inlet convergence pipeline, a plurality of branches, the outlet convergence pipeline, and the main outlet are connected sequentially. The throttling port between the branches and the inlet convergence pipeline is the inlet throttling port. The throttling port between the branches and the outlet convergence pipeline is the outlet throttling port.

[0017] In the example, the number of inflow throttling ports and the number of outflow throttling ports in the same branch are the same, and the cross-sectional area of ​​the outflow throttling port is equal to or greater than the cross-sectional area of ​​the inflow throttling port.

[0018] In an embodiment, the branch near the main inlet includes a first inlet throttling port and a first outlet throttling port, and the distance between the first inlet throttling port and the main inlet is smaller than the distance between the first outlet throttling port and the main outlet.

[0019] In an embodiment, in one of the branch sections, the branch section has a first side and a second side opposite to each other in a first direction, and in the first direction, an inflow convergence cavity is formed between the end portion of a plurality of lower branch sections and an inflow throttling port, and an outflow convergence cavity is formed between the end portion of a plurality of lower branch sections and an outflow throttling port;

[0020] Along the direction from the first side to the second side, the size of the inflow convergence cavity in the second direction gradually decreases, and the size of the outflow convergence cavity in the second direction gradually increases;

[0021] The inflow throttling port is arranged at a location where the size of the second-direction inflow convergence cavity is larger;

[0022] The outflow throttling port is arranged at a location where the size of the second-direction outflow convergence cavity is larger.

[0023] In an embodiment, an inlet cavity is provided at a main inlet, and the main inlet communicates with an inlet convergence pipeline through the inlet cavity, and a plurality of inlet protrusions are arranged in the inlet cavity, and a plurality of inlet protrusions are arranged in an array.

[0024] In an embodiment, an outlet cavity is provided to a main outlet, and the main outlet communicates with an outlet convergence pipeline through the outlet cavity, and a plurality of outlet protrusions are arranged in the outlet cavity, and a plurality of outlet protrusions are arranged in an array.

[0025] In an embodiment, a plurality of first flow guide strips are arranged within an inlet convergence pipeline, and a plurality of first flow guide strips are arranged spaced apart and extend along a first direction.

[0026] In an embodiment, a plurality of first flow guide strips are arranged in one or more rows along a second direction.

[0027] In the embodiment, the structure of the battery cooling plate is symmetrical on both sides of the central axis, with the connection line at the location where the center of the two external interfaces is located serving as the central axis.

[0028] In an embodiment, the battery cooling plate comprises a first plate body and a second plate body located opposite the first plate body. The first plate body forms a cavity and a plurality of convex ribs on its surface. The plurality of convex ribs are arranged in the cavity. The convex ribs separate the cavity to form two converging pipelines, a plurality of branching sections, and a plurality of sub-branching sections. The second plate body is provided with a plurality of butt joint holes. A plurality of butt joint holes are provided corresponding to the plurality of convex ribs. The plurality of convex ribs are connected to the plurality of butt joint holes in a butt mode to realize a positional connection between the first plate body and the second plate body.

[0029] In the embodiment, a plurality of convex ribs and a plurality of butt joint holes are press-fitted.

[0030] In the example, the butt joint hole is a through hole.

[0031] In another aspect, an embodiment of the present disclosure further provides a battery system comprising a battery and the aforementioned battery cooling plate. The battery cooling plate is attached to the battery.

[0032] According to the battery cooling plate and battery system provided by an embodiment of the present disclosure, two external interfaces are each connected to an intermediate position of two convergence pipelines in a first direction. Thus, the flow path of the coolant within the convergence pipeline can be half the length of the convergence pipeline, and accordingly, the flow resistance along the path of the coolant within the convergence pipeline can be reduced. By progressively increasing the total cross-sectional area of ​​a plurality of throttling ports in a branch far from the main outlet and making the width, i.e., the cross-sectional area, of the sub-branch in all branches equal, the flow resistance of each branch can be balanced, ensuring that the flow resistance of various branches is consistent and the flow rate of the coolant within various branches is balanced, thereby further making the temperature at various locations of the cooling plate more uniform, improving heat dissipation balance and efficiency, and facilitating a reduction in the system demand for power of the circulation pump, thereby further reducing system costs. Brief explanation of the drawing

[0033] To more clearly explain the technical solution of the present disclosure, the accompanying drawings necessary for explaining embodiments are briefly introduced below. Clearly, the accompanying drawings in the following description illustrate only some embodiments of the present disclosure, and those skilled in the art can still derive other drawings from these accompanying drawings without creative effort. FIG. 1 is a schematic structural diagram of a pipeline of a battery cooling plate provided by an embodiment of the present disclosure; FIG. 2 is a schematic diagram illustrating the flow of a coolant in the pipeline of FIG. 1; FIG. 3 is a schematic structural diagram of a first plate body of a battery cooling plate provided by an embodiment of the present disclosure; FIG. 4 is a schematic structural diagram of the second plate body of a battery cooling plate provided by an embodiment of the present disclosure. Specific details for implementing the invention

[0034] The following describes the technical solution of an embodiment of the present disclosure clearly and completely with reference to the accompanying drawings of an embodiment of the present disclosure.

[0035] To better understand the aforementioned objectives, features, and advantages of the present disclosure, the present disclosure is described below in detail with reference to the accompanying drawings and embodiments. It should be noted that embodiments of the present disclosure and features of the embodiments may be combined with one another to the extent that they do not conflict.

[0036] To facilitate a complete understanding of the present disclosure, many specific details are illustrated in the following description. The described embodiments are only a part, not all, of the embodiments of the present disclosure. All other embodiments obtained by a person skilled in the art based on the embodiments of the present disclosure without creative effort fall within the scope of protection of the present disclosure.

[0037] The present disclosure provides a battery cooling plate and a battery system. The battery system includes a battery and a battery cooling plate. The battery cooling plate is attached to the battery. The battery cooling plate can perform heat dissipation on the battery by a liquid cooling method.

[0038] In the following description, the first direction extending along the X-axis is hereinafter referred to as the "first direction (X)", and the second direction extending along the Y-axis is hereinafter referred to as the "second direction (Y)", and these directions are two directions that are orthogonal to each other. In combination with what is shown in FIG. 1, the battery cooling plate is square overall, the first direction (X) is the longitudinal direction of the left and right sides of the battery cooling plate, and the second direction (Y) is the width direction of the top and bottom of the battery cooling plate. Of course, in other embodiments, the first direction (X) may be the width direction of the battery cooling plate, and the second direction (Y) may be the longitudinal direction of the battery cooling plate.

[0039] As illustrated in FIGS. 1 and 2, along the flow direction of the coolant, the battery cooling plate comprises a main inlet (10a), an inlet convergence pipeline (20a), a plurality of branch sections (31 / 32 / 33), an outlet convergence pipeline (20b), and a main outlet (10b), which are sequentially connected. The main inlet (10a) and the main outlet (10b) serve as two external interfaces of the battery cooling plate and can be used to connect to two circulation end ports of a circulation pump, respectively. The coolant flows into the battery cooling plate through the main inlet (10a), then flows sequentially through the inlet convergence pipeline (20a), the plurality of branch sections (31 / 32 / 33), and the outlet convergence pipeline (20b), exits the battery cooling plate from the main outlet (10b), and flows back to the circulation pump.

[0040] The inlet convergence pipeline (20a) and the outlet convergence pipeline (20b) are two convergence pipelines, each arranged at the main inlet (10a) and the main outlet (10b). Both the inlet convergence pipeline (20a) and the outlet convergence pipeline (20b) are arranged to extend along the first direction (X). The main inlet (10a) is connected to the middle position of the inlet convergence pipeline (20a) along the first direction (X). After the coolant enters the inlet convergence pipeline (20a) through the main inlet (10a), the coolant flows in the first direction (X) to each end of the inlet convergence pipeline (20a), so that the flow path of the coolant within the inlet convergence pipeline (20a) becomes half the length of the inlet convergence pipeline (20a), thereby reducing the flow resistance along the path of the coolant within the inlet convergence pipeline (20a).

[0041] An inlet cavity (11a) is provided in the main inlet (10a), and the main inlet (10a) is connected to an inlet convergence pipeline (20a) through the inlet cavity (11a). The inlet cavity (11a) is square, and a plurality of inlet protrusions (12a) are arranged within the inlet cavity (11a), and the plurality of inlet protrusions (12a) are arranged in an array, and the plurality of inlet protrusions (12a) are also used to divert the coolant entering the inlet cavity (11a) so as to avoid the case where the coolant becomes too concentrated at that location and increases flow resistance.

[0042] A plurality of first flow guide strips (21a) are arranged within an inlet convergence pipeline (20a), and a plurality of first flow guide strips (21a) are arranged spaced apart and extend along a first direction (X). A plurality of first flow guide strips (21a) extend along the first direction (X). By using the first flow guide strips (21a), the coolant entering the inlet convergence pipeline (20a) can flow along the first flow guide strips (21a), that is, flow along the first direction (X), thereby reducing the flow resistance of the coolant within the inlet convergence pipeline (20a). A plurality of first flow guide strips (21a) are arranged spaced apart along the first direction (X). A portion of the coolant can flow to a branching section in the gap between the plurality of flow guide strips.

[0043] In this embodiment, a plurality of first flow guide strips (21a) are arranged in two rows along the second direction (Y) to better achieve the effect of guiding the flow and reducing flow resistance, while at the same time, more coolant can be guided to a branch far from the main inlet (10a). In another embodiment, a plurality of first flow guide strips (21a) may be arranged in one row, three rows, or more rows in the first direction (X) depending on the length of the battery cooling plate and the need for flow guidance.

[0044] A plurality of branch sections (31 / 32 / 33) are arranged side by side along the first direction and are located between the inlet convergence pipeline (20a) and the outlet convergence pipeline (20b) in the second direction (Y). Both ends of each branch section in the second direction (Y) are connected to the inlet convergence pipeline (20a) and the outlet convergence pipeline (20b) through a plurality of throttling ports.

[0045] A plurality of sub-branches are arranged in each branch (31 / 32 / 33) along the first direction (X). Each sub-branch is arranged to extend along the second direction (Y). The end portions of a plurality of sub-branches in the same branch are connected so that the cooling liquid entering the branch enters the sub-branch from one end of the sub-branch and exits the sub-branch from the other end of the sub-branch.

[0046] In this embodiment, the number of branch sections is six, and if the connecting line between the center of the main inlet (10a) and the main outlet (10b) is located in the first direction (X) is used as the central axis, three branch sections are arranged on each side of the central axis, and the structure of both sides of the central axis is generally the same, and the structure of each of the three branch sections is described in this specification as an example of one side. For convenience of explanation, each of the three branch sections is a first branch section (31), a second branch section (32), and a third branch section (33). The second branch section (32) is arranged between the first branch section (31) and the third branch section (33). The first branch section (31) is closer to the main inlet (10a) and the main outlet (10b) compared to the third branch section (33).

[0047] One end of the first branch section (31) is connected to the inlet convergence pipeline (20a) through the first inlet throttling port (31a), and the other end of the first branch section is connected to the outlet convergence pipeline (20b) through the first outlet throttling port (31b). In the first branch section (31), the number of first inlet throttling ports (31a) is one, and the number of first outlet throttling ports (31b) is one. A plurality of first sub-branches (310) are arranged within the first branch section (31). In the present specification, the number of first inlet throttling ports (31a) and the number of first outlet throttling ports (31b) may be determined according to the number of first sub-branches (310) within the first branch (31), and if the number of first sub-branches (310) is large, two or more first inlet throttling ports (31a) may be provided so that the coolant can enter the entire first sub-branches (310). Two or more first outlet throttling ports (31b) may also be provided to allow the coolant to be discharged out of the first branch (31) in a timely manner and to avoid excessive pressure in the first branch (31), in this case, since the cross-sectional area of ​​each first outlet throttling port (31b) and the cross-sectional area of ​​each first inlet throttling port (31a) are the same, the flow of the coolant is controlled by setting the number. Of course, in other embodiments, it may be possible to keep the number of first outflow throttling ports (31b) and the number of first inflow throttling ports (31a) both as one. The flow of the coolant is controlled by increasing or decreasing the cross-sectional area.

[0048] The distance between the first inlet throttling port (31a) and the main inlet (10a) is smaller than the distance between the first outlet throttling port (31b) and the main outlet (10b), and accordingly, the coolant entering the inlet convergence pipeline (20a) flows over a shorter distance and enters the first branch (31), making it easier for the coolant to enter the first branch (31) and reducing the resistance of the coolant to enter the first branch (31). In this embodiment, the cross-sectional area of ​​the first outlet throttling port (31b) is the same as the cross-sectional area of ​​the first inlet throttling port (31a) to facilitate machining and molding. To further reduce the flow resistance between the first branch (31) and the outlet convergence pipeline (20b), the cross-sectional area of ​​the first outlet throttling port (31b) may be set larger than the cross-sectional area of ​​the first inlet throttling port (31a).

[0049] In the first branch section (31), the first branch section (31) has a first side (311) and a second side (312) that are opposite each other in the first direction (X). In this embodiment, the first side (311) is closer to the main entrance and main exit compared to the second side (312). Of course, in other embodiments, it is also possible for the second side (312) to be closer to the main entrance and main exit compared to the first side (311).

[0050] An inflow convergence cavity (30a) is formed between the end portions of a plurality of first sub-branches (310) and the first inflow throttling port (31a), and along the direction from the first side (311) to the second side (312), and the size of the inflow convergence cavity (30a) in the second direction (Y) is gradually reduced so that the inflow convergence cavity (30a) becomes a roughly triangular wedge-shaped structure. The first inflow throttling port (31a) is located at a position where the size of the inflow convergence cavity (30a) is larger in the second direction (Y), that is, the first inflow throttling port (31a) is located at a position closer to the first side (311), and the inflow convergence cavity (30a) has a larger space at a position closer to the first inflow throttling port (31a), which makes it easier for the coolant to enter the first branch (31), thereby reducing the flow resistance for entering the first branch (31).

[0051] A discharge convergence cavity (30b) is formed between the end portions of a plurality of first sub-branches (310) and the first discharge throttling port (31b), and along the direction from the first side (311) to the second side (312), and the size of the discharge convergence cavity (30b) in the second direction (Y) gradually increases so that the discharge convergence cavity (30b) becomes a roughly triangular wedge-shaped structure. The first discharge throttling port (31b) is located at a position where the size of the discharge convergence cavity (30b) in the second direction (Y) is larger, that is, the first discharge throttling port (31b) is located at a position close to the second side (312). The space of the outflow convergence cavity (30b) at a location close to the first outflow throttling port (31b) is larger, making it easier for the coolant to converge to the location of the outflow convergence cavity (30b) close to the first outflow throttling port (31b), thereby making it easier for the coolant to flow from the first outflow throttling port (31b) to the outlet convergence pipeline (20b) and reducing the flow resistance of the coolant when it flows out of the first branch (31).

[0052] Along the direction from the first side (311) to the second side (312), the size of the inflow convergence cavity (30a) in the second direction (Y) is gradually reduced, and the size of the outflow convergence cavity (30b) in the second direction (Y) is gradually increased, so that the inlet (311) of the first sub-branch (310) near the first side can be made larger and the outlet of the first sub-branch near the first side can be made smaller, and the inlet (312) of the first sub-branch (310) near the second side can be made smaller and the outlet of the first sub-branch near the second side can be made larger, thereby ensuring that the coolant flow rates of the different first sub-branch (310) are nearly the same and ensuring balanced flow of coolant in the various first sub-branch (310). In a plurality of branching sections, the branch closest to the location of the external interface, that is, for example in this embodiment, the first branching section has the largest number of sub-branches, and in this branching section, both the inflow convergence cavity and the outflow convergence cavity are wedge-shaped to ensure balance among the plurality of sub-branches, whereas in other branching sections such as the second branching section and the third branching section, the number of sub-branches is relatively small, and it is sufficient for both the inflow convergence cavity and the outflow convergence cavity to be set as squares.

[0053] One end of the second branch (32) communicates with the inlet convergence pipeline (20a) through two second inlet throttling ports (32a), and the other end of the second branch communicates with the outlet convergence pipeline (20b) through two second outlet throttling ports (32b). A plurality of second sub-branches (321) are arranged within the second branch (32). One end of the third branch (33) communicates with the inlet convergence pipeline (20a) through three third inlet throttling ports (33a), and the other end of the third branch communicates with the outlet convergence pipeline (20b) through three third outlet throttling ports (33b). A plurality of third sub-branches (331) are arranged within the third branch (33).

[0054] In this embodiment, the first inflow throttling port (31a), the second inflow throttling port (32a), and the third inflow throttling port (33a) have the same hole, that is, the same cross-sectional area, and since the number of the first inflow throttling port (31a) is 1, the number of the second inflow throttling ports (32a) is 2, and the number of the third inflow throttling ports (33a) is 3, the total cross-sectional area of ​​the 1 first inflow throttling port (31a), the total cross-sectional area of ​​the 2 second inflow throttling ports (32a), and the total cross-sectional area of ​​the 3 third inflow throttling ports (33a) increase sequentially, that is, the total cross-sectional area of ​​the multiple inflow throttling ports in the branch section close to the main inlet (10a) is smaller than the total cross-sectional area of ​​the multiple throttling ports in the branch section far from the main inlet (10a), and far from the main inlet (10a) By gradually increasing the total cross-sectional area of ​​multiple throttling ports in the separated branch, the flow resistance of the coolant to enter the branch far from the main inlet (10a) can be reduced.

[0055] Since the first inlet throttling port (31a), the second inlet throttling port (32a), and the third inlet throttling port (33a) have the same hole, that is, the same cross-sectional area, if the number of throttling ports is designed according to the distance between the branch section and the main inlet (10a), the flow resistance of the coolant to enter the branch section far from the main inlet (10a) is reduced, making it easier to perform the structural layout design.

[0056] In another embodiment of the present specification, the number of second inflow throttling ports (32a) and the number of third inflow throttling ports (33a) may both be one, in which case the hole, i.e., the cross-sectional area of ​​the second inflow throttling port (32a) must be larger than the cross-sectional area of ​​the first inflow throttling port (31a), and the hole, i.e., the cross-sectional area of ​​the third inflow throttling port (33a) must be larger than the cross-sectional area of ​​the second inflow throttling port (32a).

[0057] Additionally, as the number of first inflow throttling ports (31a), the number of second inflow throttling ports (32a), and the number of third inflow throttling ports (33a) gradually increases, the cross-sectional area of ​​the first inflow throttling ports, the second inflow throttling ports, and the third inflow throttling ports may also be set to gradually increase in order to further reduce the flow resistance of the coolant for entering the second branch and the third branch.

[0058] In this embodiment, the first outflow throttling port (31b), the second outflow throttling port (32b), and the third outflow throttling port (33b) have the same hole, that is, the same cross-sectional area, and since the number of the first outflow throttling port (31b) is 1, the number of the second outflow throttling ports (32b) is 2, and the number of the third outflow throttling ports (33b) is 3, the total cross-sectional area of ​​the 1 first outflow throttling port (31b), the total cross-sectional area of ​​the 2 second outflow throttling ports (32b), and the total cross-sectional area of ​​the 3 third outflow throttling ports (33b) increase sequentially, that is, the total cross-sectional area of ​​the multiple outflow throttling ports in the branch section close to the main outlet (10b) is smaller than the total cross-sectional area of ​​the multiple throttling ports in the branch section far from the main outlet (10b), and far from the main outlet (10b) By gradually increasing the total cross-sectional area of ​​multiple throttling ports in the separated branch, the flow resistance of the coolant flowing out from the branch far from the main outlet (10b) can be reduced.

[0059] Since the first outflow throttling port (31b), the second outflow throttling port (32b), and the third outflow throttling port (33b) have the same hole, that is, the same cross-sectional area, if the number of outflow throttling ports is designed according to the distance between the branch section and the main outlet (10b), the flow resistance of the coolant flowing out of the branch section far from the main outlet (10b) is reduced, making it easier to perform the structural layout design.

[0060] In the present specification, in another embodiment, the number of second outflow throttling ports (32b) and the number of third outflow throttling ports (33b) may both be one, in which case the hole, i.e., cross-sectional area of ​​the second outflow throttling port (32b) must be larger than the cross-sectional area of ​​the first outflow throttling port (31b), and the hole, i.e., cross-sectional area of ​​the third outflow throttling port (33b) must be larger than the cross-sectional area of ​​the second outflow throttling port (32b).

[0061] Additionally, as the number of the first outflow throttling ports (31b), the number of the second outflow throttling ports (32b), and the number of the third outflow throttling ports (33b) gradually increases, the cross-sectional area of ​​the first outflow throttling ports, the second outflow throttling ports, and the third outflow throttling ports may also be set to gradually increase in order to further reduce the flow resistance of the coolant flowing out of the second branch and the third branch.

[0062] The number of first sub-branches (310) of the first branch section (31) is greater than the number of second sub-branches (321) of the second branch section (32), and the number of second sub-branches (321) of the second branch section (32) is equal to the number of third sub-branches (331) of the third branch section (33). More specifically, in this embodiment, the number of first sub-branches (310) is 10, the number of second sub-branches (321) is 4, and the number of third sub-branches (331) is 4. Of course, the number of first sub-branches (310), the number of second sub-branches (321), and the number of third sub-branches (331) are not limited to this and can be set to other desired numbers.

[0063] The number of first sub-branches (310) of the first branch (31) that is relatively closer to the main inlet (10a) is greater, and the number of second sub-branches (321) and third sub-branches (331) that are relatively further away from the main inlet (10a) is smaller, which can reduce the flow resistance of the coolant when entering the second branch (32) and the third branch (33).

[0064] In all branches, the width, i.e., the cross-sectional area of ​​the sub-branches is the same, that is, the cross-sectional areas of the plurality of first sub-branches (310), the plurality of second sub-branches (321), and the plurality of third sub-branches (331) are the same, which can make the flow resistance of the coolant within the various sub-branches equal, and at the same time, the volume of the coolant within the plurality of sub-branches is the same, which ensures uniformity of heat dissipation at various locations of the battery cooling plate. When combined with the description of the quantitative relationship above, it can be seen that in the first direction (X), the size of the first branch (31) is larger than the size of the second branch (32) and the size of the third branch (33).

[0065] A plurality of second flow guide strips (21b) are arranged within the outlet convergence pipeline (20b), and a plurality of second flow guide strips (21b) are arranged spaced apart and extend along the first direction (X). A plurality of second flow guide strips (21b) extend along the first direction (X). By using the second flow guide strips (21b), the coolant entering the inlet convergence pipeline (20a) can flow along the second flow guide strips (21b), that is, flow along the first direction (X), thereby reducing the flow resistance of the coolant within the inlet convergence pipeline (20a). A plurality of second flow guide strips (21b) are arranged spaced apart along the first direction (X). A portion of the coolant can flow into the outlet convergence pipeline (20b) in the gaps between the plurality of flow guide strips.

[0066] An outlet cavity (11b) is provided in the main outlet (10b), and the main outlet (10b) is connected to an outlet convergence pipeline (20b) through the outlet cavity (11b). The outlet cavity (11b) is square, and a plurality of outlet protrusions (12b) are arranged within the outlet cavity (11b), and the plurality of outlet protrusions (12b) are arranged in an array, and the plurality of outlet protrusions (12b) are also used to divert the coolant flowing out of the outlet cavity (11b) so as to avoid the case where the coolant becomes too concentrated at that location and increases flow resistance.

[0067] In this embodiment, as illustrated in FIGS. 3 and 4, the battery cooling plate comprises a first plate body (100) and a second plate body (200) arranged in parallel, and both the first plate body (100) and the second plate body (200) are manufactured as heat-conducting plates to facilitate heat transfer. The first plate body (100) is stamped to form a cavity (101) and a plurality of convex ribs (102) on the surface of the plate body, and the plurality of convex ribs (102) are arranged in the cavity (101), and the convex ribs (102) separate the cavity (101) to form a plurality of pipelines through which the cooling liquid passes, that is, the cavity (101) can be separated into two converging pipelines (20a / 20b), a plurality of branching sections (31 / 32 / 33), and a plurality of sub-branches located within the branching section. A plurality of butt joint holes (202) are provided in the second plate body (200), and the plurality of butt joint holes (202) are provided corresponding to a plurality of convex ribs (102), and the plurality of convex ribs (102) are connected to the plurality of butt joint holes (202) in a butt mode to realize a positional connection between the first plate body (100) and the second plate body (200). The convex ribs (102) and the butt joint holes (202) can be press-fitted so that the convex ribs (102) are firmly connected to the butt joint positions, thereby ensuring that a plurality of branch sections (31 / 32 / 33) are isolated from each other and avoiding the flow of coolant between the branch sections. A thermal conductive sealant is provided between the butt joint holes (202) and the convex ribs (102) to further ensure that the connection positions between the butt joint holes and the convex ribs are sealed.

[0068] In this embodiment, the butt joint hole (202) is a through hole to facilitate machining and molding by stamping, and the convex rib (102) is connected to the butt joint hole (202), and the butt joint hole (202) is filled with a heat-conducting sealant so that the butt joint hole (202) is flush with the outer surface of the second plate body (200), thereby facilitating attachment to the battery. Of course, in other embodiments, the butt joint hole (202) may also be a closed hole. As an alternative embodiment, the second plate body (200) may not be provided with a butt joint hole (202).

[0069] Additionally, embodiments of the present disclosure further provide a battery system comprising a battery and the aforementioned battery cooling plate. The battery cooling plate is attached to the battery, and the battery cooling plate can perform heat dissipation on the battery by a liquid cooling method.

[0070] According to the battery cooling plate and battery system provided in the present disclosure, the main inlet and main outlet of the battery cooling plate are positioned at an intermediate location of the cooling plate, and the coolant enters the cooling plate from the main inlet at the intermediate location, then flows to both sides, then flows through a plurality of branches, and then exits the cooling plate from the main outlet at the intermediate location, so that the flow pipeline of the coolant in the battery cooling plate takes the form of an approximately U-shaped structure. A plurality of converging pipelines are connected in parallel as much as possible according to the battery arrangement, that is, a plurality of rows of flow guide strips are arranged to reduce resistance along the path of the converging pipelines. The number of branches is determined in accordance with the converging length and the branch length. To ensure homogeneity of flow distribution at a single switching branch, a throttling port is designed at each branch based on the distance from the throttling port to the main inlet and the distance from the throttling port to the main outlet. The flow channel structure arrangement of the battery cooling plate of the present disclosure facilitates lowering the power requirements of the circulation pump system by minimizing flow resistance under the same flow of the battery cooling plate and within the same area, which reduces system costs; at the same time, the low flow resistance cooling plate structure can reduce the temperature difference between the inlet and the outlet by maximizing the flow of the battery cooling plate under the set power of the circulation pump.

[0071] According to the battery cooling plate and battery system provided by the present disclosure, the external interface of the battery cooling plate uses a one-to-one structure, the length along the path of the converging pipeline is reduced by half by the middle-in-middle-out mode of the inlet and outlet, and the switching branch uses the principle of maximizing the number of branches, and as more branches are connected in parallel, the flow resistance of the total parallel-connected pipeline is lowered, and subsequently, the flow resistance of the entire cooling plate is designed to be minimized. By using the battery cooling plate structure of the present disclosure, the flow resistance of the large cooling plate can be minimized under high flow, and by optimizing the holes, i.e., the cross-sectional area, of the throttling port, the flow of the various branches is evenly distributed, thereby improving the heat exchange performance of the entire cooling plate. By manufacturing the battery cooling plate to fit the large battery cooling plate structure while reducing flow resistance, the power of the circulation pump is reduced, thereby reducing the cost of the entire vehicle system.

[0072] In the description of the above-described embodiment, it can be understood that the first flow guide strip (21a) and the second flow guide strip (21b) are named when arranged in different convergence pipelines, that is, a plurality of flow guide strips may be arranged in the convergence pipeline, and a plurality of flow guide strips may be arranged spaced apart and extend along the first direction (X). By using the flow guide strips, the coolant entering the convergence pipeline may flow along the flow guide strips, that is, along the first direction (X), thereby reducing the flow resistance of the coolant within the convergence pipeline. A plurality of flow guide strips may be arranged in one row or in two or more rows.

[0073] In the description of the above-described embodiment, the first branch section (31), the second branch section (32), and the third branch section (33) may be understood as being named among a plurality of branch sections according to different locations, and this may be understood as different specific realizations of the branch sections. The same applies to the first sub-branch section, the second sub-branch section, and the third sub-branch section.

[0074] In the description of the above-described embodiment, the first inflow throttling port (31a), the second inflow throttling port (32a), and the third inflow throttling port (33a) are named according to the inflow throttling ports of different branches and can be understood as different realizations of inflow throttling ports, and thus, the first outflow throttling port (31b), the second outflow throttling port (32b), and the third outflow throttling port (33b) are named according to the outflow throttling ports of different branches and are different realizations of outflow throttling ports. In a specific branch, particularly a branch close to an external interface, the number of inflow throttling ports and the number of outflow throttling ports may both be one. In this case, the distance between the inlet throttling port and the main inlet (10a) can be set to be smaller than the distance between the outlet throttling port and the main outlet (10b), so that the coolant entering the inlet convergence pipeline (20a) can flow over a shorter distance and enter the branch, making it easier for the coolant to enter the branch, and at the same time, the inlet throttling port and the outlet throttling port are each provided close to opposite sides of the branch, which allows the coolant entering the branch to flow through all sub-branches. The number of inlet throttling ports and the number of outlet throttling ports in the same branch may be the same, and the cross-sectional area of ​​the outlet throttling port may be set larger than the cross-sectional area of ​​the inlet throttling port to reduce flow resistance between the branch and the outlet convergence pipeline, or the cross-sectional area of ​​the outlet throttling port may be the same as the cross-sectional area of ​​the inlet throttling port.

[0075] At the same time, the inlet throttling port and the outlet throttling port are different realizations of the throttling port. The number and cross-sectional area of ​​the inlet throttling port and the outlet throttling port are designed to control the flow and rate of the coolant entering the branch. The number of throttling ports in the branch near the external interface is smaller than the number of throttling ports in the branch far from the external interface, and accordingly, the coolant can easily enter the branch far from the external interface. The cross-sectional areas of the various throttling ports may be the same to facilitate machining and molding, or the cross-sectional area of ​​the throttling port in the branch near the external interface may be smaller than the cross-sectional area of ​​the throttling port in the branch far from the external interface, thereby also allowing the coolant to easily enter the branch far from the external interface.

[0076] In the description of the above-described embodiment, the inflow convergence cavity (30a) and the outflow convergence cavity (30b) are named according to different locations where the convergence cavity is located, and it can be understood that the inflow convergence cavity (30a) and the outflow convergence cavity (30b) are different realizations. The shape of the convergence cavity can be used in both the first branch section (31) and the other branch section; the shape of the convergence cavity is particularly suitable when the number of inflow throttling ports and the number of outflow throttling ports in the branch section are both 1. In the branch section, a convergence cavity may be formed between the end portions of a plurality of lower branch sections and the throttling ports, and the size of the convergence cavity in the first direction (X) and the second direction (Y) gradually decreases from a location close to the throttling port to a location far from the throttling port, thereby allowing the coolant to flow easily into and out of the branch section and reducing the flow resistance of the coolant flowing into and out of the branch section.

[0077] In the description of the above-described embodiment, it can be understood that the inlet cavity (11a) and the outlet cavity are different realizations of the interface cavity, and that the interface cavity may be arranged in an external interface, and that the external interface communicates with a convergence pipeline through the interface cavity. The interface cavity is square, and a plurality of protrusions are arranged within the inlet cavity (11a), and the plurality of protrusions are arranged in an array, and the plurality of protrusions are also used to divert the coolant flowing into and out of the interface cavity so as to avoid the case where the coolant becomes too concentrated at that location and increases flow resistance.

[0078] In the above-described embodiment, the number of sub-branches within the two branching sections located at both ends in the first direction (X) is slightly different, and in this specification, to ensure a balance of flow resistance at both ends, the number of sub-branches within the two branching sections located at both ends in the first direction (X) can be set to be the same. Furthermore, by using the connection line between the positions where the centers of the two external interfaces are located as the central axis, the structure of the battery cooling plates on both sides of the central axis can be set to a completely symmetrical structure, thereby ensuring consistent flow resistance on both sides.

[0079] In the aforementioned embodiment, the number of branch sections is six, with three branch sections on both sides of the intermediate position, and the coolant can enter from the main inlet of the intermediate position and flow toward both ends along the inlet convergence pipeline, and after passing through the branch sections, the coolant flows back to the main outlet from both sides through the outlet convergence pipeline. The number of branch sections is not limited thereto, and under the condition that there is sufficient space, the branch sections are arranged as many as possible for switching, and the number of branch sections can be designed according to the arrangement of battery cells or heat dissipation requirements, and when the number of branch sections is determined from the perspective of design to reduce flow resistance: if the size of the battery cooling plate in the first direction is twice as large as the size of the battery cooling plate in the second direction, the number of branch sections is designed according to the requirements of the heat dissipation surface of the battery cells, and, for example, a design of multiple branch sections connected in parallel based on the above embodiment is used, and the fourth and fifth branch sections are increased, that is, the number of branch sections is increased; It should be noted that when the size of the battery cooling plate in the first direction is twice as small as the size of the battery cooling plate in the second direction, the branch may be designed based on half the length of the battery cooling plate in combination with the width of the lower branch, for example, in this embodiment, the number of branch is six. In this specification, the battery cooling plate is square, and since its size in the first direction is relatively larger than its size in the second direction, the size in the first direction is the length of the battery cooling plate and the size in the second direction is the width of the battery cooling plate, so half the length of the battery cooling plate is half the size of the battery cooling plate in the first direction. Since the lower branch is arranged along the second direction in the form of an elongated strip, the length of the lower branch is its size in the second direction and the width of the lower branch is its size in the first direction, so it can be understood that the flow resistance of the flow channels of the entire cooling plate can be further equalized, thereby improving the cooling and heat dissipation capacity.

[0080] The foregoing description is an embodiment of the present disclosure, and those skilled in the art should note that numerous improvements and modifications can be made without departing from the principles of the present disclosure, and such improvements and modifications fall within the scope of protection of the present disclosure.

Claims

Claim 1 A battery cooling plate comprising two external interfaces, two convergence pipelines, and a plurality of branching sections, wherein each of the convergence pipelines is arranged to extend along a first direction, and each of the two external interfaces is in communication with an intermediate position of the two convergence pipelines in the first direction; the plurality of branching sections are arranged side by side along the first direction and are arranged between the two convergence pipelines in a second direction; each end of each branching section in the second direction is in communication with the two convergence pipelines through at least one throttling port; and the first direction and the second direction are two directions orthogonal to each other; A battery cooling plate in which a plurality of sub-branches are arranged in the branch near the external interface, and each of the sub-branches is arranged to extend along the second direction, and the end portions of the plurality of sub-branches in the same branch are connected, and the cross-sectional area of ​​all sub-branches is the same. Claim 2 A battery cooling plate according to claim 1, wherein the number of throttling ports in the branch portion close to the external interface is less than the number of throttling ports in the branch portion far from the external interface. Claim 3 A battery cooling plate according to claim 1, wherein the number of throttling ports in the branch portion close to the external interface is the same as the number of throttling ports in the branch portion far from the external interface. Claim 4 In paragraph 2, the cross-sectional area of ​​the various throttling ports is the same, for the battery cooling plate. Claim 5 A battery cooling plate according to claim 1, wherein the cross-sectional area of ​​the throttling port in the branch portion closer to the external interface is smaller than the cross-sectional area of ​​the throttling port in the branch portion farther from the external interface. Claim 6 A battery cooling plate according to claim 1, wherein the number of sub-branches within the branch section closer to the external interface is greater than the number of sub-branches within the branch section farther from the external interface. Claim 7 A battery cooling plate according to claim 1, wherein all sub-branches in all branch sections have the same cross-sectional area. Claim 8 A battery cooling plate according to claim 1, wherein the two external interfaces are each a main inlet and a main outlet; the two convergence pipelines are each an inlet convergence pipeline and an outlet convergence pipeline; the main inlet, the inlet convergence pipeline, the plurality of branching sections, the outlet convergence pipeline, and the main outlet are sequentially connected; the throttling port between the branching section and the inlet convergence pipeline is an inlet throttling port; and the throttling port between the branching section and the outlet convergence pipeline is an outlet throttling port. Claim 9 A battery cooling plate according to claim 8, wherein the number of inlet throttling ports and the number of outlet throttling ports in the same branching section are the same, and the cross-sectional area of ​​the outlet throttling ports is the same as or greater than the cross-sectional area of ​​the inlet throttling ports. Claim 10 A battery cooling plate according to claim 8, wherein the branch portion near the main inlet includes a first inlet throttling port and a first outlet throttling port, and the distance between the first inlet throttling port and the main inlet is smaller than the distance between the first outlet throttling port and the main outlet. Claim 11 In claim 8, in one of the branching sections, the branching section has a first side and a second side opposite to each other in the first direction, an inflow convergence cavity is formed between the end portion of a plurality of lower branching sections and the inflow throttling port, and an outflow convergence cavity is formed between the end portion of a plurality of lower branching sections and the outflow throttling port; along the direction from the first side to the second side, the size of the inflow convergence cavity in the second direction gradually decreases, and the size of the outflow convergence cavity in the second direction gradually increases; the inflow throttling port is arranged at a position where the size of the inflow convergence cavity in the second direction is larger; and the outflow throttling port is arranged at a position where the size of the outflow convergence cavity in the second direction is larger, a battery cooling plate. Claim 12 A battery cooling plate according to claim 8, wherein an inlet cavity is provided in the main inlet, the main inlet communicates with the inlet convergence pipeline through the inlet cavity, a plurality of inlet protrusions are arranged in the inlet cavity, and the plurality of inlet protrusions are arranged in an array. Claim 13 A battery cooling plate according to claim 8, wherein an outlet cavity is provided in the main outlet, the main outlet communicates with the outlet convergence pipeline through the outlet cavity, a plurality of outlet protrusions are arranged in the outlet cavity, and the plurality of outlet protrusions are arranged in an array. Claim 14 A battery cooling plate according to claim 8, wherein a plurality of first flow guide strips are arranged within the inlet convergence pipeline, and the plurality of first flow guide strips extend along the first direction and are spaced apart. Claim 15 In claim 14, the plurality of first flow guide strips are arranged in one or more rows along the second direction, forming a battery cooling plate. Claim 16 A battery cooling plate according to claim 1, wherein the structure of the battery cooling plate is symmetrical on both sides of the central axis, with the connection line at the location where the center of the two external interfaces is located as the central axis. Claim 17 A battery cooling plate according to claim 1, wherein the battery cooling plate comprises a first plate body and a second plate body located opposite the first plate body; the first plate body forms a cavity and a plurality of convex ribs on its surface; the plurality of convex ribs are located in the cavity; the convex ribs separate the cavity to form the two converging pipelines, the plurality of branching sections, and the plurality of sub-branching sections; the second plate body is provided with a plurality of butt joint holes; the plurality of butt joint holes are provided corresponding to the plurality of convex ribs; and the plurality of convex ribs are connected to the plurality of butt joint holes in a butt mode to realize a positional connection between the first plate body and the second plate body. Claim 18 A battery cooling plate according to claim 17, wherein the plurality of convex ribs and the plurality of butt joint holes are press-fitted. Claim 19 In Clause 17, the butt joint hole is a through hole, a battery cooling plate. Claim 20 A battery system comprising a battery and a battery cooling plate according to any one of claims 1 to 19, wherein the battery cooling plate is attached to the battery.

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