Battery pack having cover plate cooling function

Abstract

The present invention belongs to the technical field of battery pack structures, and specifically relates to a battery pack having a cover plate cooling function. The present invention provides a battery pack having a cover plate cooling function, which, by means of arranging a hollow insertion plate unit and a liquid blocking plate unit on a pipe-equipped housing unit, can achieve: 1. the hollow insertion plate unit being able to perform more ample cooling on either side and above a battery cell, ensuring higher liquid cooling efficiency and a larger effective liquid cooling area; and 2. the liquid blocking plate unit being able to perform organized flow guidance within the hollow insertion plate unit, preventing slow-moving flows over a large area and ensuring liquid cooling strength at a higher efficiency.

Description

A battery pack with cover cooling function Technical Field

[0001] The present invention belongs to the technical field of battery pack structures, and in particular relates to a battery pack with a cover plate cooling function. Background Art

[0002] The structure of a typical lithium-ion battery used in electric vehicles and electric two-wheeled vehicles mainly includes a battery pack, battery cells, and a control circuit board. The battery pack structure can be further divided into a shell and a cover.

[0003] On the other hand, there are three common cooling methods for battery cells: air cooling, pipeline liquid cooling, and immersion liquid cooling. Among them, pipeline liquid cooling can achieve a better balance between cooling intensity and safety.

[0004] Existing tubular liquid cooling systems for battery packs are typically independent of the housing and cover. This structure features a liquid inlet at one end and a liquid outlet at the other, with the center positioned as close to the battery cells as possible to achieve relatively efficient cooling.

[0005] However, the independent pipe-type liquid cooling structure requires a large number of pipes, which greatly increases the production cost of the battery pack. Therefore, more advanced integrated pipe-type liquid cooling structures have been developed, such as integrating the liquid cooling pipes into the cover.

[0006] A Chinese utility model patent with patent publication number CN218414931U and publication date 2023.01.31 discloses a battery module liquid cooling cover plate, including: a liquid cooling plate, provided with a refrigerant channel, and a liquid inlet and a liquid outlet connected to the refrigerant channel, configured for contact heat exchange connection with the battery cell.

[0007] The cooling principle and advantages of the liquid-cooled cover plate in this utility model patent are as follows: the liquid-cooled plate uses liquid as the refrigerant, and the heated refrigerant flowing out through the liquid outlet is cooled by a circulation pipeline connected to a water pump and a condenser, and then flows back to the refrigerant channel through the liquid inlet to achieve a continuous cooling effect.

[0008] However, in actual use, the liquid cooling cover plate still has at least the following shortcomings, which are also the technical problems to be solved by the present invention, namely:

[0009] The refrigerant channel is only located above the battery cell and cannot cool the sides and / or bottom of the battery cell, so the cooling efficiency is low.

[0010] Therefore, in summary, there is an urgent need for a cover-integrated liquid-cooled battery pack with more comprehensive effective cooling positions for use in the production of various types of power lithium batteries. Summary of the Invention

[0011] The present invention provides a battery pack with a cover plate cooling function. By arranging a hollow plug-in plate unit, a liquid baffle plate unit, and a liquid inlet and outlet pipe unit on a tube shell unit, the following can be achieved: 1. The hollow plug-in plate unit can perform relatively sufficient cooling operations above and on both sides of the battery cell, ensuring higher liquid cooling efficiency and a larger effective liquid cooling area; 2. The liquid baffle plate unit can guide the liquid in an orderly manner within the hollow plug-in plate unit, avoiding slow flow over a large area, and ensuring more efficient liquid cooling intensity.

[0012] The technical solution adopted by the present invention to solve the above-mentioned problem is: a battery pack with a cover plate cooling function, the structure of which includes a tube shell unit, a hollow plug-in plate unit arranged on the upper surface of the tube shell unit and located on both sides of the battery cell, a liquid baffle plate unit arranged in the hollow plug-in plate unit, and an inlet and outlet liquid pipe unit arranged on the liquid baffle plate unit and plugged with the hollow plug-in plate unit and used to connect the tube shell unit.

[0013] A further preferred technical solution is that the tube housing unit includes a rectangular shell, wiring holes arranged on the side panels of the rectangular shell, wiring tubes arranged on the outer surface of the rectangular shell, and a double-hole connecting plate with one end of the wiring tube and the other end of the liquid inlet and outlet pipe unit.

[0014] A further preferred technical solution is that the tube housing unit further includes a wiring groove provided on the inner side surface and inner bottom surface of the rectangular shell and connected to the wiring hole.

[0015] A further preferred technical solution is that the hollow plug-in plate unit includes a horizontal plate arranged on the upper surface of the rectangular shell, two vertical plates arranged on the upper surface of the horizontal plate and located on both sides of the battery cell, a liquid cooling cavity arranged in the horizontal plate and the vertical plates and used to install the liquid baffle plate unit, and two pipe holes respectively arranged on both sides of the liquid cooling cavity and used to install the liquid inlet and outlet pipe unit.

[0016] A further preferred technical solution is that the hollow plug-in board unit further includes a groove provided on the upper surface of the transverse plate and used for reducing the slow flow in the liquid cooling cavity and installing a control circuit board.

[0017] A further preferred technical solution is that the hollow plug-in board unit further includes a reinforcing connecting top plate arranged on the groove.

[0018] A further preferred technical solution is that the liquid baffle unit includes a bottom connecting plate which is respectively arranged in the two vertical plates and the top edge and two side edges of which are connected to the liquid cooling cavity.

[0019] A further preferred technical solution is that: the liquid baffle plate unit further includes a reinforcement strip with two ends respectively provided on the two bottom connecting plates and located inside the transverse plate.

[0020] A further preferred technical solution is that the liquid inlet and outlet pipe unit includes two liquid cooling pipes whose inner ends are arranged on the bottom connecting plate, plugged into the pipe holes, and used to insert into the double-hole connecting plate, and a connecting hole arranged on the liquid cooling pipe and located in the liquid cooling cavity.

[0021] A further preferred technical solution is that the tube housing unit further includes a mounting nut provided on the wiring tube and used for clamping the double-hole connecting plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic structural diagram of the present invention.

[0023] FIG2 is a schematic structural diagram of a shell unit with tubes in the present invention.

[0024] FIG3 is a schematic diagram showing the position of the liquid baffle unit in the present invention.

[0025] FIG4 is a schematic structural diagram of the hollow inserting plate unit of the present invention.

[0026] FIG5 is a schematic diagram showing the position structure of the liquid baffle unit in the present invention from a top view.

[0027] FIG6 is a schematic diagram showing the position structure of the liquid inlet and outlet pipe units in the present invention.

[0028] FIG. 7 is a schematic diagram showing the installation method of the wiring and external coolant pipe in the present invention.

[0029] In the figure, the meanings of the marks are as follows:

[0030] Battery cell a, control circuit board b, wiring c, external coolant pipe d;

[0031] Tube housing unit 1, hollow insert plate unit 2, liquid baffle plate unit 3, liquid inlet and outlet pipe unit 4;

[0032] Rectangular housing 101, wiring hole 102, wiring tube 103, double-hole connecting plate 104, wiring groove 105, horizontal plate 201, vertical plate 202, liquid cooling chamber 203, pipe hole 204, groove 205, reinforced connecting top plate 206, bottom connecting plate 301, reinforcement strip 302, liquid cooling tube 401, connecting hole 402, mounting nut 106. DETAILED DESCRIPTION

[0033] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

[0034] As shown in Figures 1-7, a battery pack with a cover plate cooling function comprises a tubular housing unit 1, a hollow plug-in plate unit 2 arranged on the upper surface of the tubular housing unit 1 and located on both sides of the battery cell a, a liquid baffle plate unit 3 arranged within the hollow plug-in plate unit 2, and a liquid inlet and outlet pipe unit 4 arranged on the liquid baffle plate unit 3, plugged into the hollow plug-in plate unit 2, and used to connect to the tubular housing unit 1.

[0035] In this embodiment, the hollow plug-in plate unit 2, the liquid baffle plate unit 3 and the liquid inlet and outlet pipe unit 4 are a whole, that is, the cover structure of the battery pack. Both ends of the liquid inlet and outlet pipe unit 4 are connected to the liquid cooling system, which can ensure that there is a liquid cooling effect above and on both sides of the battery cell a, greatly improving the liquid cooling efficiency.

[0036] Among them, the general shape of the hollow plug-in unit 2 is similar to the "π" shape, so that the battery cell a can be relatively inserted into it to obtain a more sufficient cooling effect, and it itself can engage with the two inner sides of the tube shell unit 1 to facilitate the alignment and installation of the cover structure.

[0037] Next, consider the inlet and outlet pipe unit 4 and the "pipe" structure on the tube housing unit 1. The former facilitates the flow of coolant, while the latter facilitates the installation of the wiring c. The two, in conjunction with each other, secure the cover plate structure to the tube housing unit 1, eliminating the need for conventional bolts – a highly ingenious technique.

[0038] Finally, the liquid baffle unit 3 is used to reduce the degree of slow flow in the hollow insert unit 2. The reason is that the liquid inlet and outlet positions of the hollow insert unit 2 are both relatively high. If there is no liquid baffle unit 3 to guide the flow below, the slow flow will be serious, almost like "stagnant water", which will greatly reduce the cooling efficiency.

[0039] Furthermore, the reason why the liquid inlet and outlet positions of the hollow plug-in plate unit 2 are relatively above is to avoid drilling holes on the tube shell unit 1 to install the liquid inlet and outlet pipes, so as to obtain a battery pack shell with higher structural integrity and strength.

[0040] The tube housing unit 1 includes a rectangular shell 101, a wiring hole 102 arranged on the side panel of the rectangular shell 101, a wiring tube 103 arranged on the outer surface of the rectangular shell 101, and a double-hole connecting plate 104 with one end of which is sleeved on the wiring tube 103 and the other end of which is sleeved on the inlet and outlet pipe unit 4.

[0041] In this embodiment, the number of the wiring holes 102 is 1 or 2, which are aligned with the wiring tube 103. The number of the double-hole connecting plates 104 is 2, corresponding to the liquid inlet and outlet pipes of the liquid inlet and outlet pipe unit 4. The double-hole connecting plates 104 are rectangular in shape with a circular hole at each end. By simultaneously sleeved on the wiring tube 103 and the liquid inlet and outlet pipe unit 4, it can be ensured that the cover plate structure is firmly installed on the tube housing unit 1 and is not easy to fall off.

[0042] The tube housing unit 1 further includes a wiring slot 105 provided on the inner side surface and the inner bottom surface of the rectangular shell 101 and connected to the wiring hole 102 .

[0043] In this embodiment, the wiring slot 105 is L-shaped, with its upper end connected to the wiring hole 102 and its lower end edge partially exposed outside the coverage area of ​​the hollow plugboard unit 2, ensuring:

[0044] Even if the hollow plugboard unit 2 is tightly attached to the inner side surface and inner bottom surface of the rectangular shell 101, it does not affect the outward extension of the wiring c, and ultimately the size of the hollow plugboard unit 2 can be maximized, and it can fully fit the rectangular shell 101, ensuring that the cover structure has a unique installation position.

[0045] The hollow plug-in plate unit 2 includes a horizontal plate 201 arranged on the upper surface of the rectangular shell 101, two vertical plates 202 arranged on the upper surface of the horizontal plate 201 and located on both sides of the battery cell a, a liquid cooling cavity 203 arranged in the horizontal plate 201 and the vertical plates 202 and used for installing the liquid baffle plate unit 3, and two pipe holes 204 respectively arranged on both sides of the liquid cooling cavity 203 and used for installing the liquid inlet and outlet pipe unit 4.

[0046] In this embodiment, the horizontal plate 201, vertical plate 202, liquid cooling cavity 203 and tube hole 204 are all integrally formed. The thin-walled structure can be obtained in one step by blow molding or by splicing single plates.

[0047] Under the guiding effect of the liquid baffle unit 3, the coolant flow direction of the thin-walled structure is as follows:

[0048] One end of the horizontal plate 201 , the inside of the vertical plate 202 on the same side, the middle area of ​​the liquid cooling chamber 203 , the inside of the vertical plate 202 on the opposite side, and the other end of the horizontal plate 201 .

[0049] At this point, the coolant fully flows over and on both sides of the battery cell a, ensuring sufficient and efficient cooling intensity.

[0050] The hollow plug-in board unit 2 further includes a groove 205 provided on the upper surface of the transverse plate 201 and used to reduce the slow flow in the liquid cooling chamber 203 and to install a control circuit board b.

[0051] In this embodiment, the groove 205 has at least the following two functions:

[0052] First, the thicker part in the middle of the liquid cooling chamber 203 is narrowed to prevent a large amount of slow flow from occurring there, so that the coolant with a relatively high temperature can be discharged in a timely and sufficient manner;

[0053] Second, provide a safe installation position for the control circuit board b to prevent collision.

[0054] The hollow inserting plate unit 2 further includes a reinforcing connecting top plate 206 disposed on the groove 205 .

[0055] In this embodiment, the reinforced connecting top plate 206 is a rear-mounted plate structure compared to the horizontal plate 201, which covers the entire groove 205, or at least completely covers the control circuit board b. Its functions include at least:

[0056] First, shield and protect the control circuit board b to prevent it from being bumped and intruded with a large amount of dust. At this time, the circuit board wires enter and exit from the openings at both ends of the groove 205;

[0057] Second, the inlet and outlet pipe unit 4 will be slightly pulled down during installation, and the groove 205 is at risk of expanding or cracking. The reinforced connecting top plate 206 connects both sides of the groove 205 at the same time, thereby reinforcing the groove 205 with relatively weak lateral structural strength.

[0058] The liquid baffle unit 3 includes a bottom connecting plate 301 which is respectively arranged in the two vertical plates 202 and has a top edge and two side edges connected to the liquid cooling cavity 203 .

[0059] In this embodiment, the coolant cannot pass above or on both sides of the bottom connecting plate 301. The bottom connecting plate 301 leaves only a gap of 1-5 cm between the bottom and the bottom surface of the liquid cooling chamber 203, ultimately ensuring that the lower area of ​​the liquid cooling chamber 203 will not be "stagnant water", so that there is a flowing and efficient pipeline liquid cooling effect above and on both sides of the battery cell a.

[0060] On the other hand, the bottom connecting plate 301 is solidified together with the thin-walled structure of the hollow plug-in plate unit 2 on the top and both sides, and the two are fixedly connected. Therefore, the bottom connecting plate 301 can also structurally strengthen the thin-walled structure, so that the "cover plate with cooling function" itself has sufficient structural rigidity and is not easy to bend.

[0061] The liquid baffle unit 3 further includes a reinforcement strip 302 , with two ends respectively disposed on the two bottom connecting plates 301 and located inside the transverse plate 201 .

[0062] In this embodiment, the number of the reinforcement strips 302 is 2-5, and their function is to connect the two bottom connecting plates 301, directly improving the structural strength of the entire liquid baffle unit 3, and indirectly improving the bending resistance of the hollow plug-in plate unit 2.

[0063] The liquid inlet and outlet pipe unit 4 includes two liquid cooling pipes 401 whose inner ends are arranged on the bottom connecting plate 301 and are plugged into the pipe holes 204 and used to be inserted into the double-hole connecting plate 104, and a connecting hole 402 arranged on the liquid cooling pipe 401 and located in the liquid cooling cavity 203.

[0064] In this embodiment, the inner end of the liquid cooling tube 401 and the bottom connecting plate 301, as well as the outer annular surface and the tube hole 204, are integrally formed and fixedly connected. The former ensures that the liquid cooling tube 401 is not easily displaced, and the latter ensures that the tube hole 204 is not easily leaked.

[0065] In addition, the connecting hole 402 is located inside the tube hole 204, ensuring that the liquid cooling tube 401 can effectively flow in and out of the cooling liquid.

[0066] The tube housing unit 1 further includes a mounting nut 106 disposed on the wiring tube 103 and used for clamping the double-hole connecting plate 104 .

[0067] In this embodiment, a threaded section is provided on the outer annular surface of the wiring tube 103, and the mounting nut 106 clamps the double-hole connecting plate 104 inwardly, thereby ensuring that the entire cover structure of the battery pack is not easy to fall off after insertion.

[0068] In addition, the battery pack is only provided with the double-hole connecting plate 104 on two symmetrical sides for connection and reinforcement, which is relatively strong and easy to assemble and disassemble. In addition, for waterproof performance considerations, a rectangular sealing ring can be further provided between the rectangular housing 101 and the horizontal plate 201.

[0069] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the aforementioned embodiments. Various modifications are possible within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. These modifications are non-inventive and are protected by patent law as long as they fall within the scope of the claims of the present invention.

Claims

1. A battery pack with a cover plate cooling function, characterized in that: The structure includes a pipe-carrying housing unit (1), a hollow plug unit (2) disposed on the upper surface of the pipe-carrying housing unit (1) and at both sides of the battery cell (a), a liquid baffle unit (3) disposed within the hollow plug unit (2), and a liquid inlet / outlet pipe unit (4) disposed on the liquid baffle unit (3), inserted into the hollow plug unit (2), and used for connecting the pipe-carrying housing unit (1).

2. The battery pack with a cover plate cooling function according to claim 1, wherein: The pipe-carrying housing unit (1) includes a rectangular outer shell (101), a wiring hole (102) disposed on the side plate of the rectangular outer shell (101), a wiring pipe (103) disposed on the outer side surface of the rectangular outer shell (101), and a double-hole connecting plate (104) with one end sleeved on the wiring pipe (103) and the other end sleeved on the liquid inlet / outlet pipe unit (4).

3. The battery pack with a cover plate cooling function according to claim 2, characterized in that: The pipe-carrying housing unit (1) further includes a wiring groove (105) disposed on the inner side surface and inner bottom surface of the rectangular outer shell (101) and connecting the wiring hole (102).

4. A battery pack with a cover plate cooling function according to claim 2, characterized in that: The hollow plug unit (2) includes a cross plate (201) disposed on the upper surface of the rectangular outer shell (101), two vertical plates (202) disposed on the upper surface of the cross plate (201) and at both sides of the battery cell (a) respectively, a liquid cooling cavity (203) disposed within the cross plate (201) and the vertical plates (202) and used for installing the liquid baffle unit (3), and two pipe holes (204) respectively disposed at both sides of the liquid cooling cavity (203) and used for installing the liquid inlet / outlet pipe unit (4).

5. The battery pack with a cover plate cooling function according to claim 4, characterized in that: The hollow plug unit (2) further includes a groove (205) disposed on the upper surface of the cross plate (201) and used for reducing the slow flow within the liquid cooling cavity (203) and installing a control circuit board (b).

6. The battery pack with a cover plate cooling function according to claim 5, characterized in that: The hollow plug unit (2) further includes a reinforced connecting top plate (206) disposed on the groove (205).

7. A battery pack with a cover plate cooling function according to claim 4, characterized in that: The liquid baffle unit (3) includes a bottom connecting plate (301) respectively disposed within the two vertical plates (202) and having its top edge and two side edges connected to the bottom of the liquid cooling cavity (203).

8. The battery pack with a cover plate cooling function according to claim 7, characterized in that: The liquid baffle unit (3) further includes a reinforcing bar (302) with both ends respectively disposed on the two bottom connecting plates (301) and located within the cross plate (201).

9. The battery pack with a cover plate cooling function according to claim 7, characterized in that: The liquid inlet / outlet pipe unit (4) includes two liquid cooling pipes (401) with their inner ends disposed on the bottom connecting plate (301), inserted into the pipe holes (204), and used for inserting into the double-hole connecting plate (104), and a communication hole (402) disposed on the liquid cooling pipes (401) and located within the liquid cooling cavity (203).

10. A battery pack with a cover plate cooling function according to claim 2, characterized in that: The pipe-carrying housing unit (1) further includes a mounting nut (106) disposed on the wiring pipe (103) and used for clamping the double-hole connecting plate (104).

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