Battery module and battery pack

Abstract

The present application discloses a battery module and a battery pack. The battery module comprises: a housing, the housing being provided with a liquid cooling cavity; two liquid cooling assemblies, the two liquid cooling assemblies being respectively disposed on two opposite sides of the liquid cooling cavity, each liquid cooling assembly being provided with a cooling flow channel, and the cooling flow channel being in communication with the liquid cooling cavity; a battery cell group, the battery cell group comprising a plurality of battery cells disposed in the liquid cooling cavity; and a CCS assembly, the CCS assembly being disposed between the battery cell group and any one of the liquid cooling assemblies.

Description

Battery module and battery pack

[0001] The present application claims priority to the Chinese patent application No. 2024223391954 filed on September 24, 2024 with the China Patent Office, the whole content of the above application is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to a battery module and a battery pack. BACKGROUND

[0003] With the rapid development of the times, people's requirements for the charging rate of the battery are getting higher and higher. With the increase of the charging rate of the battery, the charging current is also increasing, and the heat generated by the battery has become a key problem that people have to pay attention to. At present, the commonly used method is to increase the cooling area of the battery cell by using double-sided liquid cooling to improve the cooling efficiency. TECHNICAL PROBLEM

[0004] With the increase of the number of battery cell strings, the length of the serpentine pipe used for double-sided liquid cooling also needs to be increased, resulting in higher cost of the battery pack, which is not conducive to market competition. In addition, the double-sided liquid cooling method can only contact the side surface of the battery cell, resulting in uneven cooling of the bottom surface and the side surface of the battery cell. At the same time, during fast charging, in addition to the heat generated by the charging and discharging of the battery cell itself, the aluminum busbar in the CCS (Cells Contact System) will also generate a certain amount of heat, which will also affect the battery cell, resulting in a significant temperature difference inside the battery module. Therefore, the current double-sided liquid cooling method cannot guarantee the uniformity of the battery module, making it difficult to maintain stable operation of the battery module. TECHNICAL SOLUTION

[0005] In a first aspect, the present application provides a battery module, comprising: a box body, the box body having a liquid cooling cavity; two liquid cooling assemblies, the two liquid cooling assemblies being respectively arranged on opposite sides of the liquid cooling cavity, and the liquid cooling assembly having a cooling flow channel, the cooling flow channel being in communication with the liquid cooling cavity; a battery cell group, the battery cell group having a plurality of battery cells arranged in the liquid cooling cavity; and a CCS assembly, the CCS assembly being arranged between the battery cell group and any of the liquid cooling assemblies.

[0006] In a second aspect, the present application provides a battery pack, comprising the battery module as described above. ADVANTAGEOUS EFFECTS

[0007] The cooling liquid is driven to flow between the liquid cooling cavity and the cooling flow channel through the communication between the liquid cooling cavity and the cooling flow channel, so that the cooling liquid takes away the heat of the battery cell and the CCS assembly during the flowing process, the battery cell and the CCS assembly are uniformly cooled in all directions, and the temperature uniformity of the battery module is ensured, so that the battery module can work stably. BRIEF DESCRIPTION OF DRAWINGS

[0008] Fig. 1 is a structural schematic diagram of a battery module according to an embodiment of the present application;

[0009] Fig. 2 is a sectional view of Fig. 1 along the A-A direction;

[0010] Fig. 3 is an enlarged schematic diagram of the B region of Fig. 2;

[0011] Fig. 4 is an exploded structural schematic diagram of a battery module according to an embodiment of the present application;

[0012] Fig. 5 is an enlarged schematic diagram of the C region of Fig. 4.

[0013] In the drawings, the reference signs have the following meanings:

[0014] 1, box; 11, liquid cooling cavity; 12, opening; 13, sealing groove; 14, sealing element; 2, liquid cooling assembly; 21, cooling flow channel; 22, liquid cooling plate; 23, flow guiding through hole; 24, liquid inlet; 25, liquid outlet; 3, battery cell group; 31, battery cell; 32, flow guiding gap; 4, CCS assembly; 41, flow guiding pipe; 42, plastic support; 43, aluminum bar. Embodiments of the present application

[0015] Referring to FIG. 1, FIG. 2 and FIG. 4, the application discloses a battery module. The battery module comprises a box body 1, two liquid cooling assemblies 2, a cell group 3 and a CCS assembly 4. In some embodiments, the box body 1 has a liquid cooling cavity 11; the two liquid cooling assemblies 2 are respectively arranged on opposite sides of the liquid cooling cavity 11, and the liquid cooling assembly 2 has a cooling flow channel 21 which is in communication with the liquid cooling cavity 11; the cell group 3 has a plurality of cells 31 arranged in the liquid cooling cavity 11; and the CCS assembly 4 is arranged between the cell group 3 and any of the liquid cooling assemblies 2. In some embodiments, the liquid cooling cavity 11 and the cooling flow channel 21 are in communication, so that the cooling liquid can flow between the liquid cooling cavity 11 and the cooling flow channel 21, so that the cooling liquid can take away the heat of the cells 31 and the CCS assembly 4 during the flow process, so as to ensure that the cells 31 and the CCS assembly 4 can be uniformly cooled from all directions, so as to ensure the uniformity of the battery module, thereby ensuring the stable operation of the battery module.

[0016] In some embodiments, one end of the cell 31 is fixed to one of the liquid cooling assemblies 2, and one end of the CCS assembly 4 is fixed to the other of the liquid cooling assemblies 2, so that the cell group 3 and the CCS assembly 4 are both fixed in the liquid cooling cavity 11, so that the cooling liquid in the liquid cooling cavity 11 can fully contact the side and the other end of the cell 31 and the other end and the side of the CCS assembly 4 immersed therein, and the cooling liquid can flow between the liquid cooling cavity 11 and the cooling flow channel 21, so that the cooling effect of the liquid cooling cavity 11 and the liquid cooling assembly 2 is the same, so that the end of the cell 31 and the CCS assembly 4 connected with the liquid cooling assembly 2 can obtain the same cooling effect as the part immersed in the cooling liquid, so as to uniformly cool the cell group 3 and the CCS assembly 4 from all directions, thereby ensuring the uniformity of the battery module, and further ensuring the stable operation of the battery module.

[0017] Referring to FIG. 1 and FIG. 4, in some embodiments, the liquid cooling assembly 2 comprises a liquid cooling plate 22, and the cooling flow channel 21 is arranged in the liquid cooling plate 22. In some embodiments, the liquid cooling plate 22 is connected to the box body 1 by means of bolts, buckles, welding or the like, so that the two liquid cooling plates 22 are locked on opposite sides of the liquid cooling cavity 11.

[0018] The specific formation of the cooling flow channel 21 can be various. In some embodiments, the cooling flow channel 21 is formed in the interior of the first liquid cooling plate 22, that is, the interior of the liquid cooling plate 22 can be formed with a cavity structure, and the cavity structure is used as the cooling flow channel 21; in some embodiments, the liquid cooling plate 22 is formed by a combination of a sealing plate and a flow channel plate, the flow channel plate is provided with at least one recess recessed away from the sealing plate, the sealing plate is locked to the box body 1 by bolts, buckles, welding or the like, and the flow channel plate is welded to the side of the sealing plate away from the liquid cooling cavity 11, so that the first sealing plate and the first flow channel plate form the liquid cooling plate 22 with the cooling flow channel 21; or other ways, the innovation of the present application is not in the specific formation of the cooling flow channel 21, which will not be listed one by one here.

[0019] In the present embodiment, the cooling flow channel 21 communicates with the liquid cooling cavity 11, so that the cooling liquid can flow between the liquid cooling cavity 11 and the cooling flow channel 21, so that the cooling liquid can take away the heat of the battery cell 31 and the CCS assembly 4 during the flow process, so that the battery cell 31 and the CCS assembly 4 can be uniformly cooled in all directions, and the temperature uniformity of the battery module is ensured, so that the battery module can work stably.

[0020] Referring to FIGS. 2, 3 and 4, in some embodiments, a plurality of flow guide through holes 23 are arranged on the liquid cooling plate 22, and the flow guide through holes 23 communicate the cooling flow channel 21 with the liquid cooling cavity 11. In this way, the cooling flow channel 21 in the liquid cooling plate 22 communicates with the liquid cooling cavity 11 through the flow guide through holes 23, so that the cooling liquid flows between the cooling flow channel 21 and the liquid cooling cavity 11 through the flow guide through holes 23.

[0021] Referring to FIG. 2 and FIG. 3, in some embodiments, a flow guide gap 32 is formed between adjacent battery cells 31, and the flow guide gap 32 is arranged opposite to the flow guide through hole 23. In this way, the cooling liquid in the cooling flow channel 21 can directly flow in the flow guide gap 32, reducing the obstruction of the battery cells 31 to the flowing cooling liquid, so that the cooling liquid can flow smoothly between the liquid cooling cavity 11 and the cooling flow channel 21. In some embodiments, the flow guide gap 32 is surrounded by at least two adjacent battery cells 31; in some embodiments, the battery cell 31 is a cylindrical structure, and the flow guide gap 32 is surrounded by three adjacent battery cells 31, that is, the flow guide gap 32 is arranged in the triangular region between the three adjacent battery cells 31 arranged in a cylindrical structure, so as to make full use of the gap between the battery cells 31 and optimize the space utilization in the battery module. In this way, the cooling liquid flowing along the flow guide gap 32 can fully contact the surface of the battery cell 31, thereby quickly reducing the temperature of the battery cell 31.

[0022] Referring to FIG. 4 and FIG. 5, in some embodiments, the liquid cooling assembly 2 further comprises a flow guide pipe 41 penetrating the CCS assembly 4, one end of the flow guide pipe 41 communicates with the liquid cooling cavity 11, and the other end of the flow guide pipe 41 extends into the flow guide through hole 23. In this way, the cooling liquid in the liquid cooling cavity 11 can flow into the cooling flow channel 21 of the liquid cooling plate 22 through the flow guide pipe 41, and since the flow guide pipe 41 penetrates the CCS assembly 4, the cooling liquid flowing in the flow guide pipe 41 can take away the heat inside the CCS assembly 4, thereby achieving heat dissipation and cooling of the inside of the CCS assembly 4 and fully optimizing the cooling effect of the CCS assembly 4.

[0023] In some embodiments, the inner diameter of the flow guide through hole 23 is greater than the outer diameter of the flow guide pipe 41. In this way, by making the inner diameter of the flow guide through hole 23 greater than the outer diameter of the flow guide pipe 41, the flow guide pipe 41 can extend into the flow guide through hole 23, eliminating the tolerance between the CCS assembly 4 and the liquid cooling plate 22, facilitating the assembly of the flow guide pipe 41 and the flow guide through hole 23. In some embodiments, the diameter of the flow guide through hole 23 is 13 mm, the outer diameter of the flow guide pipe 41 is 9 mm, and the inner diameter is 6 mm, which can ensure that the flow guide through hole 23 and the flow guide pipe 41 on the other liquid cooling plate 22 are arranged opposite to each other, so that the cooling liquid can flow smoothly between the two liquid cooling plates 22 through the flow guide pipe 41.

[0024] Referring to FIG. 4 and FIG. 5, in some embodiments, the CCS assembly 4 comprises a plastic bracket 42 and an aluminum row 43, the aluminum row 43 is arranged between the plastic bracket 42 and the liquid cooling assembly 2, and the aluminum row 43 is attached to the liquid cooling assembly 2. In some embodiments, the surface of the aluminum row 43 is provided with a structural adhesive, a heat-conducting adhesive or the like adhesive, so that the aluminum row 43 can be bonded to the liquid cooling plate 22, and the aluminum row 43 can be attached to the liquid cooling plate 22, so that the liquid cooling plate 22 can be in full contact with the aluminum row 43, thereby optimizing the cooling effect of the liquid cooling plate 22 on the aluminum row 43. In some embodiments, the liquid cooling plate 22 can also be provided with a wire hole for leading out a collection wire harness. Further, the flow guide pipe 41 is an independent component, one end of the flow guide pipe 41 is exposed to the liquid cooling cavity 11, the other end of the flow guide pipe 41 passes through the plastic bracket 42 and the aluminum row 43, and extends into the flow guide through hole 23, or the flow guide pipe 41 is integrally formed with the plastic bracket 42, and one end of the flow guide pipe 41 away from the battery cell 31 is exposed to the liquid cooling cavity 11, the other end of the flow guide pipe 41 passes through the aluminum row 43, and extends into the flow guide through hole 23, so that when the cooling liquid in the liquid cooling cavity 11 flows to the cooling flow channel 21 through the flow guide pipe 41, the cooling liquid can take away the heat on the aluminum row 43, and the cooling effect of the aluminum row 43 is optimized.

[0025] Referring to FIG. 1 and FIG. 4, in some embodiments, two liquid cooling assemblies 2 are arranged on the upper and lower sides of the liquid cooling cavity 11 respectively, the CCS assembly 4 is arranged between the battery cell group 3 and the upper liquid cooling assembly 2, and the upper liquid cooling assembly 2 is connected with a liquid outlet interface, and the lower liquid cooling assembly 2 is connected with a liquid inlet interface 24. In this way, the cooling liquid flows into the liquid inlet interface 24 and then flows out of the liquid outlet interface. In some embodiments, the liquid inlet interface 24 is in communication with the lower cooling flow channel 21, and the liquid outlet interface is in communication with the upper cooling flow channel 21. In this way, the cooling liquid first enters the lower cooling flow channel 21, then enters the liquid cooling cavity 11 from the lower flow guide through hole 23, and when the cooling liquid fills the liquid cooling cavity 11, it can enter the upper cooling flow channel 21 through the flow guide pipe 41, and then flow out of the liquid outlet interface. That is, the cooling liquid needs to immerse the battery cell 31 and the CCS assembly 4 in the liquid cooling cavity 11 to enter the upper cooling flow channel 21, which effectively guarantees the cooling effect of the battery cell 31 and the CCS assembly 4. Further, whether the cooling liquid cools the battery cell 31 and the CCS assembly 4 comprehensively can be intuitively reflected by judging whether the cooling liquid flows out of the liquid outlet interface. Specifically, the flow path of the cooling liquid in the battery module is as follows: the cooling liquid is input into the lower cooling flow channel 21 through the liquid inlet interface 24, so that the cooling liquid flows in the lower cooling flow channel 21 to cool the bottom end of the battery cell 31, and at the same time, the cooling liquid in the cooling flow channel 21 enters the liquid cooling cavity 11 through the flow guide through hole 23 and fills the liquid cooling cavity 11, so that the cooling liquid in the liquid cooling cavity 11 cools the side surface, the top end of the battery cell 31 immersed therein, and the bottom end and the side surface of the CCS assembly 4, and then the cooling liquid in the liquid cooling cavity 11 enters the upper cooling flow channel 21 through the flow guide pipe 41 to cool the top end of the CCS assembly 4 attached to the upper liquid cooling plate 22, and then flows out of the liquid outlet interface to the outside. As can be seen, the flow path of the cooling liquid in the battery module covers the bottom end, the side surface and the top end of the battery cell 31 and the bottom end, the side surface and the top end of the CCS assembly 4, so when the cooling liquid flows out of the liquid outlet interface, it means that the cooling liquid has flowed through the side surface and the end of the battery cell 31 and the CCS assembly 4, which can intuitively reflect that the cooling liquid cools the battery cell 31 and the CCS assembly 4 comprehensively.

[0026] Referring to FIG. 4, in some embodiments, the box 1 is provided with openings 12 on opposite sides, the openings 12 are provided with sealing grooves 13 on the circumferential side, the sealing grooves 13 are equipped with sealing elements 14, and the liquid cooling assembly 2 is sealingly connected with the sealing elements 14. In some embodiments, the sealing elements 14 are adhesive, sealing tape, sealing glue or sealing gasket, etc.; in some embodiments, the sealing elements 14 are positioned by being arranged in the sealing grooves 13, and then the liquid cooling plate 22 is bonded or abutted with the sealing elements 14, so that the liquid cooling plate 22 is sealingly connected with the box 1, preventing the cooling liquid in the liquid cooling cavity 11 from leaking, and further, the liquid cooling plate 22 and the box 1 can be locked by fasteners such as bolts, screws, rivets, etc., to form a stable and sealed whole, while ensuring that the liquid cooling plate 22 is tightly connected with the sealing elements 14, improving the sealing effect.

[0027] In some embodiments, a battery pack includes a battery module as described above.

[0028] Referring to FIGS. 1, 2, 3, 4 and 5, in some embodiments, the bottom end of the battery cell 31 is fixed on the lower liquid cooling plate 22, and the top end of the CCS assembly 4 is fixed on the upper liquid cooling plate 22, so that the battery cell group 3 and the CCS assembly 4 are both fixed in the liquid cooling cavity 11. The cooling liquid is input into the lower cooling flow channel 21 through the liquid inlet 24, so that the cooling liquid flows in the lower cooling flow channel 21 to cool the bottom end of the battery cell 31. At the same time, the cooling liquid in the cooling flow channel 21 enters and fills the liquid cooling cavity 11 through the flow guide through hole 23, so that the cooling liquid in the liquid cooling cavity 11 cools the side surface and top end of the battery cell 31 immersed therein, and the bottom end and side surface of the CCS assembly 4, and then the cooling liquid in the liquid cooling cavity 11 enters the upper cooling flow channel 21 through the flow guide pipe 41 to cool the top end of the CCS assembly 4 attached to the upper liquid cooling plate 22, and then flows out to the outside through the liquid outlet, realizing the flow of the cooling liquid between the liquid cooling cavity 11 and the two cooling flow channels 21, so that the cooling liquid takes away the heat of the battery cell 31 and the CCS assembly 4 during the flow process, ensuring that the side surface and end of the battery cell 31 and the CCS assembly 4 can obtain better cooling effect, realizing uniform cooling of the battery cell group 3 and the CCS assembly 4 in all directions, ensuring the uniformity of the battery module, and thus ensuring the stable operation of the battery module.

Claims

1. A battery module, comprising: a box (1) having a liquid cooling cavity (11) ; two liquid cooling assemblies (2) respectively arranged on opposite sides of the liquid cooling cavity (11), and each of the liquid cooling assemblies (2) having a cooling flow channel (21) in communication with the liquid cooling cavity (11) ; a cell group (3) having a plurality of cells (31) arranged in the liquid cooling cavity (11) ; a CCS assembly (4) arranged between the cell group (3) and any of the liquid cooling assemblies (2).

2. The battery module of claim 1, wherein: The liquid cooling assembly (2) comprises a liquid cooling plate (22), and the cooling flow channel (21) is arranged in the liquid cooling plate (22).

3. The battery module of claim 2, wherein: A plurality of flow guide through holes (23) are arranged on the liquid cooling plate (22), and the flow guide through holes (23) are in communication with the cooling flow channel (21) and the liquid cooling cavity (11).

4. The battery module of claim 3, wherein: Flow guide gaps (32) are formed between adjacent cells (31), and the flow guide gaps (32) are arranged opposite to the flow guide through holes (23).

5. The battery module of claim 3, wherein: The liquid cooling assembly (2) further comprises a flow guide pipe (41) penetrating through the CCS assembly (4), one end of the flow guide pipe (41) is in communication with the liquid cooling cavity (11), and the other end of the flow guide pipe (41) extends into the flow guide through hole (23).

6. The battery module of claim 5, wherein: The inner diameter of the flow guide through hole (23) is greater than the outer diameter of the flow guide pipe (41).

7. The battery module of any one of claims 1-6, wherein: The CCS assembly (4) comprises a plastic support (42) and an aluminum row (43), the aluminum row (43) is arranged between the plastic support (42) and the liquid cooling assembly (2), and the aluminum row (43) is attached to the liquid cooling assembly (2).

8. The battery module of any one of claims 1-6, wherein: The two liquid cooling assemblies (2) are arranged on the upper and lower sides of the liquid cooling cavity (11), the CCS assembly (4) is arranged between the cell group (3) and the upper liquid cooling assembly (2), and the upper liquid cooling assembly (2) is connected with a liquid outlet interface, and the lower liquid cooling assembly (2) is connected with a liquid inlet interface (24).

9. The battery module of any one of claims 1-6, wherein: The box (1) is provided with an opening (12) on each of the opposite sides, a sealing groove (13) is arranged on the periphery of the opening (12), a sealing element (14) is arranged in the sealing groove (13), and the liquid cooling assembly (2) is sealingly connected with the sealing element (14). 10.A battery pack comprising the battery module according to any one of claims 1-9.

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