Battery cell group, battery pack and vehicle

Abstract

The utility model relates to the technical field of batteries, particularly provides a battery cell group, a battery pack and a vehicle, and aims to solve the problems that the heat exchange efficiency of a liquid cooling plate horizontally arranged at the top or the bottom is low, the horizontal liquid cooling plate occupies the space in the height direction of the battery pack, the space utilization rate in the battery pack is reduced, and the service life of the battery pack is prolonged. And a liquid cooling plate is arranged, so that the weight of the battery pack is increased and the manufacturing cost is increased. In order to achieve the purpose, the battery cell group comprises a flow guide frame and two battery cells, the flow guide frame is arranged between the two battery cells, and the flow guide frame and the two battery cells define a closed heat exchange runner; a first opening and a second opening are formed in the first end of the frame body of the flow guide frame and communicate with the heat exchange runner. The heat exchange efficiency of the battery cells can be improved, the flow guide frames do not occupy the space in the height direction of the battery pack, the space utilization rate in the battery pack is higher, and meanwhile the weight and the manufacturing cost of the battery pack can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and specifically provides a battery cell group, a battery pack and a vehicle. Background Art

[0002] As one of the core components of new energy vehicles, the power battery pack has attracted much attention for its safety performance and endurance performance. When the battery pack is discharging, the battery cells will generate heat. The battery cooling system can quickly remove the heat generated by the battery cells to prevent the battery cells from overheating and causing dangerous situations. Therefore, the battery cooling system has a great impact on the performance, life and safety of the battery pack.

[0003] At present, the common arrangement of cooling systems in modules and whole packs is that the liquid cooling plate is placed flat at the bottom or top, and the liquid cooling plate introduces coolant through connecting pipes to cool the bottom or top of the battery cell. However, the heat exchange efficiency of the liquid cooling plate placed flat at the top or bottom is low, and the liquid cooling plate placed flat will occupy the space in the height direction of the battery pack, reducing the space utilization rate in the battery pack. The installation of the liquid cooling plate will also increase the weight of the battery pack and the manufacturing cost.

[0004] Accordingly, the art requires a new battery cell group, battery pack and vehicle to solve the above problems. Utility Model Content

[0005] The present application aims to solve the above-mentioned technical problems, namely, to solve the problems that the heat exchange efficiency of the liquid cooling plate placed flat on the top or bottom is low, and the flat liquid cooling plate will occupy the space in the height direction of the battery pack, reducing the space utilization rate in the battery pack, and the installation of the liquid cooling plate will also increase the weight of the battery pack and increase the manufacturing cost.

[0006] In a first aspect, the present application provides a battery cell group; the battery cell group comprises a flow guide frame and two battery cells, the flow guide frame is arranged between the two battery cells, and the flow guide frame and the two battery cells are surrounded to form a closed heat exchange flow channel;

[0007] A first opening and a second opening are provided at a first end of the frame body of the flow guide frame, and the first opening and the second opening are communicated with the heat exchange flow channel.

[0008] In a preferred technical solution of the above battery cell group, a sealant is further included, and the sealant seals the gap between the battery cell and the flow guide frame.

[0009] In the preferred technical solution of the above battery cell group, the sealing member includes two sealing pads, which are respectively arranged on two side walls of the flow guide frame and pressed against the battery cell; and / or

[0010] The sealing member comprises a sealing adhesive layer, and the sealing adhesive layer is fixed between the outer wall of the flow guide frame and the two battery cells.

[0011] In the preferred technical solution of the above battery cell group, the first opening includes a plurality of liquid inlet holes, the second opening includes a plurality of liquid return holes, and the liquid inlet holes and the liquid return holes pass through one end of the frame body of the guide frame.

[0012] In the preferred technical solution of the above-mentioned battery cell group, the guide frame also includes a diverter, which extends into the heat exchange channel and is arranged on the frame body of the guide frame, and the diverter is pressed against the battery cell. The diverter divides the heat exchange channel into a first liquid inlet channel and a first liquid return channel that are connected.

[0013] In the preferred technical solution of the above battery cell group, the diverter is a straight rod and is arranged parallel to the length direction of the battery cell; or

[0014] The flow divider is a straight rod, and the flow divider is arranged obliquely; or

[0015] The cross section of the diverter along the length direction of the battery core is wave-shaped.

[0016] In the preferred technical solution of the above-mentioned battery cell group, a current collector is further included, on which a liquid inlet connector and a liquid return connector are provided, the current collector is connected to the first end of the flow guide frame and communicates with the liquid inlet hole and the liquid return hole;

[0017] An isolation plate is provided in the current collector, and the isolation plate divides the inner cavity of the current collector into two independent cavities, one of which is connected to the liquid inlet joint and the liquid inlet hole, and the other is connected to the liquid return joint and the liquid return hole.

[0018] In a second aspect, the present application provides a battery pack; the battery pack includes a box;

[0019] A cooling pipe, wherein the cooling pipe is arranged in the box body, and a partition plate is arranged in the cooling pipe, and the partition plate can separate the cooling pipe into a second liquid inlet flow channel and a second liquid return flow channel which are independent of each other;

[0020] The battery cell group as described above, wherein a plurality of the battery cell groups are arranged in the box body and distributed on both sides of the cooling tube;

[0021] A sleeve frame is sleeved on the outside of a plurality of battery cell groups arranged side by side, so that two of the battery cells can be pressed against the guide frame.

[0022] In the preferred technical solution of the above battery pack, the liquid inlet connector is connected to the second liquid inlet channel, and the liquid return connector is connected to the second liquid return channel.

[0023] In a third aspect, the present application provides a vehicle; the vehicle includes the battery pack as described above.

[0024] When the above technical solution is adopted, the guide frame is pressed against the two battery cells and is surrounded by the two battery cells to form a closed heat exchange channel. The coolant flows into the heat exchange channel through the first opening to exchange heat with the battery cells, and the coolant after heat exchange flows out of the heat exchange channel through the second opening. Compared with the liquid cold plate cooling method, the coolant exchanges heat with the liquid cold plate, and the bottom of the battery cell exchanges heat with the liquid cold plate. In this application, the coolant can directly contact the large surface of the battery cell for heat exchange, which reduces the interface thermal resistance, and the area of ​​the large surface of the battery cell is larger than the area of ​​the bottom of the battery cell, which increases the heat exchange area, thereby improving the heat exchange efficiency between the coolant and the battery cell. The coolant can quickly cool or heat the battery cell, so that the battery cell group can maintain a good working condition.

[0025] In addition, by arranging the flow guide frame between two battery cells to exchange heat with the battery cells, the flow guide frame will not occupy the space in the height direction of the battery pack, thereby improving the space utilization rate in the battery pack.

[0026] In addition, the guide frame is small in size and light in weight. By replacing the larger and heavier liquid cooling plate with the guide frame, the weight of the battery pack can be reduced, thereby reducing the weight of the entire vehicle and saving manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, in which:

[0028] Figure 1 is an exploded view of the battery pack of the present application;

[0029] Figure 2 is a top view of the battery pack of the present application (without showing the upper cover);

[0030] Figure 3 is a cross-sectional view of the battery pack of the present application (the box body and the upper cover are not shown);

[0031] Figure 4 yes Figure 3 A magnified view of part A;

[0032] Figure 5 is a schematic diagram of a battery pack in this application;

[0033] Figure 6 is an exploded view of the battery pack in this application;

[0034] Figure 7 is a cross-sectional view of a battery pack in the present application;

[0035] Figure 8 It is a partial schematic diagram of the flow guide frame in this application;

[0036] Fig. 9is a cross-sectional view of the battery pack in the present application from another perspective;

[0037] Fig.10 is a cross-sectional view of a battery cell assembly according to a second preferred embodiment of the present application;

[0038] Fig.11 is a cross-sectional view of a battery cell assembly according to a third preferred embodiment of the present application;

[0039] Fig.12 is a cross-sectional view of the sealing gasket and the guide frame of the present application;

[0040] Reference numerals:

[0041] 1. Box body; 2. Upper cover; 3. Expansion beam; 41. Cooling pipe; 42. Partition plate; 43. Second liquid inlet channel; 44. Second liquid return channel; 5. Frame; 60. Battery cell; 61. Guide frame; 611. Liquid inlet hole; 612. Liquid return hole; 621. Sealing gasket; 622. Sealant layer; 63. Diverter; 64. Current collector; 65. Isolation plate; 66. Liquid inlet connector; 67. Liquid return connector; 68. First liquid inlet channel; 69. First liquid return channel. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0043] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In order to solve the problem that the heat exchange efficiency of the liquid cooling plate placed flat on the top or bottom is low, and the flat liquid cooling plate will occupy the space in the height direction of the battery pack and reduce the space utilization rate in the battery pack, the installation of the liquid cooling plate will also increase the weight of the battery pack and increase the manufacturing cost.

[0046] like Figure 1 and Figure 2 As shown, this embodiment discloses a vehicle, which includes a vehicle body and a battery pack, and the battery pack is installed on the vehicle body to provide power for the vehicle. The battery pack includes a box body 1, an upper cover 2, a cooling pipe 41, a plurality of expansion beams 3, a sleeve frame 5 and a battery cell group, the cooling pipe 41 is fixed in the middle of the box body 1 and arranged parallel to the length direction of the box body 1, a plurality of expansion beams 3 are evenly arranged on both sides of the cooling pipe 41 and fixed on the box body 1, and the expansion beams 3 are arranged perpendicular to the length direction of the cooling pipe 41, and the box body 1, the cooling pipe 41 and the expansion beams 3 together form a battery compartment.

[0047] Multiple cell groups are arranged side by side, and the sleeve 5 is sleeved on the outside of the cell group to squeeze the cell group. One sleeve 5 can be sleeved on the outside of multiple cell groups arranged side by side to save the number of sleeves 5; multiple sleeves 5 can also be sleeved on the outside of multiple cell groups so that the multiple cell groups can fit together better. Multiple cell groups are placed in the battery compartment and squeezed and fixed by the expansion beam 3. The bottom of the cell group can also be bonded to the box body 1 to improve the fixing effect of the cell group in the battery compartment. The upper cover 2 is buckled on the box body 1 and fixed to the box body 1 by a number of bolts. The box body 1 is connected to the vehicle body through a mounting mechanism.

[0048] like Figure 3 and Figure 4 As shown, a partition plate 42 is fixed inside the cooling tube 41, and the cooling tube 41 is divided into a second liquid inlet channel 43 and a second liquid return channel 44 which are independent of each other by the partition plate 42. The second liquid inlet channel 43 and the second liquid return channel 44 are connected to the battery cell group and the cooling / heating system of the vehicle. The coolant flows from the cooling / heating system of the vehicle into the battery cell group through the second liquid inlet channel 43 to exchange heat with the battery cell group, and the coolant after heat exchange returns to the cooling / heating system of the vehicle through the second liquid return channel 44. Of course, the cooling tube 41 can also be replaced by an independent coolant inlet pipe and a coolant return pipe for the coolant to flow into and out of the battery cell group. However, using one pipe can save more materials, reduce manufacturing costs and the weight of the entire vehicle, and can also reduce the space occupied in the box body 1 to improve the space utilization rate in the battery pack.

[0049] like Figures 4 to 7As shown, specifically, the battery cell group includes a flow guide frame 61, a flow divider 63, a current collector 64, a seal and two battery cells 60. In this embodiment, the flow guide frame 61 is a rectangular frame. The flow guide frame 61 is pressed tightly between the two battery cells 60, and the flow guide frame 61 and the large surfaces of the two battery cells 60 are surrounded to form a closed heat exchange flow channel. The seal is fixed between the flow guide frame 61 and the battery cell 60 to seal the gap between the flow guide frame 61 and the large surface of the battery cell 60. The sleeve frame 5 is sleeved on the outside of multiple battery cell groups. Through the extrusion of the sleeve frame 5, the two battery cells 60 of each battery cell group can be pressed tightly against the flow guide frame 61 to form a closed heat exchange flow channel with the flow guide frame 61. In the case where the sleeve frame 5 is not used, the two battery cells 60 can also be pressed tightly against the flow guide frame 61 first, and then the two battery cells 60 are fixed on the box body 1 in the pressed state, but the manufacturing process is more time-consuming and labor-intensive than the method of using the sleeve frame 5, and the efficiency is lower.

[0050] like Figures 3 to 5 As shown, the current collector 64 is sleeved and fixed on the first end of the flow guide frame 61, that is, the end of the flow guide frame 61 facing the cooling tube 41. The current collector 64 is connected with a liquid inlet joint 66 and a liquid return joint 67. The liquid inlet joint 66 is connected with the second liquid inlet channel 43, and the liquid return joint 67 is connected with the second liquid return channel 44. An isolation plate 65 is fixed inside the current collector 64. The isolation plate 65 divides the inner cavity of the current collector 64 into two independent cavities. The liquid inlet joint 66 is connected with one of the cavities, and the liquid return joint 67 is connected with the other cavity, so that the liquid inlet and liquid return of the cooling liquid can be separated.

[0051] like Figure 4 , Figure 8 and Fig. 9 As shown, the end of the guide frame 61 fixed to the collector 64 is provided with a first opening and a second opening, and the isolation plate 65 is located between the first opening and the second opening to separate the first opening and the second opening. The first opening includes a plurality of liquid inlet holes 611, and the second opening includes a plurality of liquid return holes 612. The liquid inlet holes 611 and the liquid return holes 612 both penetrate one end of the guide frame 61, so that the inner cavity of the collector 64 can be connected to the heat exchange flow channel.

[0052] like Figure 4 , Figures 7 to 9As shown, the flow divider 63 is located in the heat exchange flow channel, the head end of the flow divider 63 is located between the first opening and the second opening and is fixed to the end of the flow guide frame 61 fixed to the current collector 64, the tail end of the flow divider 63 extends to the end of the flow guide frame 61 away from the current collector 64, and a set distance is left between the inner wall of the flow guide frame 61, and the two side walls of the flow divider 63 are pressed against the large surface of the two battery cells 60, dividing the heat exchange flow channel into a first liquid inlet flow channel 68 and a first liquid return flow channel 69 that are interconnected. In this embodiment, the flow divider 63 is a straight rod and is arranged parallel to the length direction of the battery cell 60, so that the areas of the first liquid inlet flow channel 68 and the first liquid return flow channel 69 are equal.

[0053] When the battery cell 60 needs to be cooled or heated, the coolant flows through the vehicle's cooling / heating system, the second liquid inlet channel 43, the liquid inlet connector 66, the liquid inlet hole 611, the first liquid inlet channel 68, the first liquid return channel 69, the liquid return hole 612, and the second liquid return channel 44 in sequence, and then returns to the vehicle's cooling / heating system. When the coolant flows through the first liquid inlet channel 68 and the first liquid return flow, it directly contacts the large surface of the battery cell 60 for heat exchange. Compared with the liquid cold plate cooling method, in which the coolant exchanges heat with the liquid cold plate and the bottom of the battery cell 60 exchanges heat with the liquid cold plate, in the present application, the coolant directly contacts the large surface of the battery cell 60 for heat exchange, which can reduce the interface thermal resistance and increase the heat exchange area, thereby improving the heat exchange efficiency between the coolant and the battery cell 60, and then the battery cell 60 can be cooled or heated faster, so that the battery cell 60 can be in a good working condition.

[0054] like Figure 1 , Figure 7 and Fig. 9 As shown, in addition, the flow guide frame 61 is arranged between the two battery cells 60, which does not occupy the space in the height direction of the battery pack, and can improve the space utilization rate in the battery pack. Moreover, by replacing the larger and heavier liquid cooling plate with the smaller and lighter flow guide frame 61 and the current collector 64, the weight of the battery pack can be reduced, thereby reducing the weight of the entire vehicle and saving manufacturing costs.

[0055] It should be noted that, although the flow divider 63 is arranged horizontally in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, such as Fig.10 As shown, the flow divider 63 can be arranged at an angle, and the tail end of the flow divider 63 can be arranged at an angle upward or at an angle downward. If the tail end of the flow divider 63 is arranged at an angle downward, the coolant flows through the first liquid return channel 69 at a faster speed, thereby improving the heat exchange efficiency of the portion where the large surface of the battery cell 60 is located in the first liquid return channel 69. Alternatively, Fig.11As shown, the flow divider 63 can also be set to other shapes, such as the shape of the flow divider 63 is a wave-shaped cross section along the length direction of the battery cell 60, which can increase the turbulence of the coolant in the heat exchange flow channel to improve the heat exchange efficiency between the coolant and the large surface of the battery cell 60. This does not deviate from the basic principle of the utility model and falls within the protection scope of the utility model.

[0056] It should be noted that, although a flow divider 63 is provided in the flow guide frame 61 in the present embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, the heat exchange assembly does not include the flow divider 63. A liquid inlet hole 611 is provided at one end of the flow guide frame 61, and a liquid inlet joint 66 is fixed in the liquid inlet hole 611. A liquid return hole 612 is provided at the other end, and a liquid return joint 67 is fixed in the liquid return hole 612. The cooling pipe 41 is replaced with an independent coolant inlet pipe and a coolant return pipe, which are respectively located at the two ends of the flow guide frame 61. The liquid inlet joint 66 is connected to the coolant inlet pipe, and the liquid return joint 67 is connected to the coolant outlet pipe. The coolant flows from the liquid inlet hole 611 into the heat exchange channel to exchange heat with the battery cell 60, and the coolant after heat exchange flows out through the outlet hole.

[0057] like Figure 6 , Figure 7 and Fig.12 As shown, the seal increases the sealing between the guide frame 61 and the large surface of the battery cell 60, which can reduce the possibility of coolant leaking from the heat exchange flow channel and causing the battery pack to not work properly. The seal includes two sealing pads 621, and the sealing pads 621 include a bonding portion and a plurality of ridges integrally formed on the bonding portion. Grooves are provided along the periphery on both sides of the guide frame 61, and the bonding portions are bonded in the grooves in a one-to-one correspondence. The plurality of ridges are pressed against the large surface of the battery cell 60 to increase the sealing effect between the guide frame 61 and the large surface of the battery cell 60, thereby improving the safety of the battery cell group operation. The bonding portion can also be bonded to the large surface of the battery cell 60 so that the ridges are pressed against the guide frame 61, which can also increase the sealing effect between the guide frame 61 and the large surface of the battery cell 60.

[0058] Furthermore, the sealant also includes a sealant layer 622. When the two battery cells 60 are pressed against the flow guide frame 61, the sealant is injected between the two battery cells 60 to form a sealant layer 622 fixed between the outer wall of the flow guide frame 61 and the two battery cells 60. The sealant layer 622 can further improve the sealing effect between the flow guide frame 61 and the large surface of the battery cell 60, thereby improving the safety of the battery cell group. Of course, only the sealing pad 621 or only the sealant layer 622 can be used to seal the gap between the flow guide frame 61 and the large surface of the battery cell 60.

[0059] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A battery cell group, characterized in that: It comprises a flow guide frame (61) and two battery cells (60), wherein the flow guide frame (61) is arranged between the two battery cells (60), and the flow guide frame (61) and the two battery cells (60) are arranged to form a closed heat exchange flow channel; A first opening and a second opening are provided at the first end of the frame body of the guide frame (61), and the first opening and the second opening are in communication with the heat exchange flow channel.

2. The battery pack according to claim 1, characterized in that: It also includes a sealant, which seals the gap between the battery core (60) and the flow guide frame (61).

3. The battery pack according to claim 2, characterized in that: The sealing member comprises two sealing pads (621), the two sealing pads (621) are respectively arranged on two side walls of the flow guide frame (61) and pressed against the battery core (60); and / or The sealing member comprises a sealing glue layer (622), and the sealing glue layer (622) is fixed between the outer wall of the flow guide frame (61) and the two battery cells (60).

4. The battery pack according to claim 1, characterized in that: The first opening comprises a plurality of liquid inlet holes (611), and the second opening comprises a plurality of liquid return holes (612), and the liquid inlet holes (611) and the liquid return holes (612) pass through one end of the frame body of the flow guide frame (61).

5. The battery pack according to claim 1, characterized in that: The flow guide frame (61) further comprises a flow divider (63), the flow divider (63) extending into the heat exchange flow channel and arranged on the frame body of the flow guide frame (61), and the flow divider (63) abuts against the battery core (60), and the flow divider (63) divides the heat exchange flow channel into a first liquid inlet flow channel (68) and a first liquid return flow channel (69) which are connected.

6. The battery pack according to claim 5, characterized in that: The diverter (63) is a straight rod and is arranged parallel to the length direction of the battery core (60); or The flow divider (63) is a straight rod, and the flow divider (63) is arranged obliquely; or The cross section of the flow divider (63) along the length direction of the battery core (60) is wavy.

7. The battery pack according to claim 4, characterized in that: It also includes a current collector (64), on which a liquid inlet joint (66) and a liquid return joint (67) are provided, and the current collector (64) is connected to the first end of the flow guide frame (61) and is in communication with the liquid inlet hole (611) and the liquid return hole (612); An isolation plate (65) is provided inside the current collector (64), and the isolation plate (65) divides the inner cavity of the current collector (64) into two independent cavities, one of which is connected to the liquid inlet joint (66) and the liquid inlet hole (611), and the other of which is connected to the liquid return joint (67) and the liquid return hole (612).

8. A battery pack, characterized in that: include: Box body (1); A cooling pipe (41), the cooling pipe (41) being arranged in the box body (1), a partition plate (42) being arranged in the cooling pipe (41), the partition plate (42) being capable of partitioning the cooling pipe (41) into a second liquid inlet flow channel (43) and a second liquid return flow channel (44) which are independent of each other; The battery cell group according to any one of claims 1 to 7, wherein a plurality of the battery cell groups are arranged in the box (1) and distributed on both sides of the cooling tube (41); A sleeve frame (5), the sleeve frame (5) being sleeved outside the plurality of battery cell groups arranged side by side, so that the two battery cells (60) can be tightly pressed against the flow guide frame (61).

9. The battery pack according to claim 8, characterized in that: The battery cell group further comprises a current collector (64), the current collector (64) being provided with a liquid inlet connector (66) and a liquid return connector (67), the current collector (64) being connected to the first end of the flow guide frame (61) and being in communication with the liquid inlet hole (611) and the liquid return hole (612); The current collector (64) is provided with an isolation plate (65), and the isolation plate (65) divides the inner cavity of the current collector (64) into two independent cavities, one of which is connected to the liquid inlet joint (66) and the liquid inlet hole (611), and the other of which is connected to the liquid return joint (67) and the liquid return hole (612); The liquid inlet joint (66) is connected to the second liquid inlet channel (43), and the liquid return joint (67) is connected to the second liquid return channel (44).

10. A vehicle, characterized in that: Comprising a battery pack as claimed in claim 8 or 9.

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