Battery cooling system and battery pack

Abstract

The utility model provides a battery cooling system which comprises a plurality of liquid cooling plates and a plurality of re-pressing components, the plurality of liquid cooling plates are sequentially arranged along the width extension direction of the liquid cooling plates, two adjacent liquid cooling plates are arranged in parallel at intervals, and heat exchange runners are arranged in the liquid cooling plates; each liquid cooling plate comprises a first harmonica-shaped tube, a second harmonica-shaped tube and an anti-collapse piece, the first harmonica-shaped tube and the second harmonica-shaped tube are oppositely arranged in parallel, the anti-collapse piece is fixed between the first harmonica-shaped tube and the second harmonica-shaped tube and used for absorbing the expansive force of the battery cell, and the multiple re-pressing assemblies are arranged on the two sides of each liquid cooling plate respectively and used for pressing the battery cell. The battery cell is abutted between two adjacent re-pressing assemblies, and the re-pressing assemblies are used for fixing the battery cell and absorbing the expansion force of the battery cell; according to the battery cooling system, the swelling capacity of the battery cells can be effectively absorbed through the re-pressing assembly between the battery cells and the heat exchange structure design of the liquid cooling plate and the battery cells.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery cooling system and a battery pack. Background Art

[0002] With the development and commercialization of electric vehicles, people are increasingly eager to use fast-charging new energy vehicles. Fast-charging technology plays an irreplaceable role in improving the user experience of electric vehicles. During the process of fast charging of battery packs, high and ultra-high currents can cause a sharp increase in battery heat generation, resulting in a sharp rise in battery pack temperature. In severe cases, this can lead to thermal runaway, resulting in risks such as battery combustion and explosion. Furthermore, excessively high battery temperatures can affect battery life and the range of electric vehicles, resulting in a poor user experience with electric vehicles.

[0003] A liquid cooling plate assembly, a battery assembly and a vehicle with publication number CN219226418U, the liquid cooling plate assembly comprising: a harmonica tube comprising a plurality of cooling channels extending along the length of the harmonica tube, the side walls of the harmonica tube in the thickness direction forming a first heat dissipation portion, the harmonica tube being arranged between two battery cells for dissipating heat from the side walls of the two battery cells; and a cooling plate being arranged on at least one side in the width direction of the harmonica tube, forming a second heat dissipation portion for dissipating heat from a battery connecting piece connecting the two battery cells; the liquid cooling plate assembly utilizes the first heat dissipation portion to cool the large surfaces of the side walls of the battery cells, while also utilizing the second heat dissipation portion to absorb heat generated when current passes through the battery connecting piece, thereby cooling the battery connecting piece.

[0004] When existing battery packs adopt the CTP layout scheme, the CTP structure cannot effectively absorb the expansion of the battery cells during the process of directly gluing the entire pack to the bottom of the box body due to the lack of end plates for fixation and limited space. Especially at the end of the battery cell's life, the battery cell expansion can reach 2% or more, which has a significant impact on the safety and performance of the battery pack and the entire vehicle. Utility Model Content

[0005] In view of this, the present invention proposes a battery cooling system and a battery pack. The large-surface liquid cooling plate between the battery cells is used as a heat exchange device to cooperate with the heat conductive layer between the battery cells and the liquid cooling plate to quickly exchange heat. At the same time, the re-pressurization component can effectively absorb the expansion of the battery cells during high-power charging and discharging, thereby improving the safety of the battery pack.

[0006] The technical solution of the present invention is implemented as follows: In a first aspect, the present invention provides a battery cooling system, comprising:

[0007] A plurality of liquid cooling plates are arranged in sequence along the width extension direction thereof, and two adjacent liquid cooling plates are spaced apart and arranged in parallel, and a heat exchange flow channel is provided in the liquid cooling plates;

[0008] Each liquid cooling plate includes a first harmonica tube, a second harmonica tube, and an anti-collapse member. The first harmonica tube and the second harmonica tube are arranged opposite and parallel to each other and are connected to form a heat exchange flow channel. The anti-collapse member is fixed between the first harmonica tube and the second harmonica tube to absorb the expansion force of the battery cell.

[0009] Several re-pressing assemblies are arranged on both sides of each liquid cooling plate, and the battery cells are abutted between two adjacent re-pressing assemblies. The re-pressing assemblies are used to fix the battery cells and absorb the expansion force of the battery cells.

[0010] On the basis of the above technical solution, preferably, each of the re-pressing components includes at least two first layered strips and a second layered striped strips, wherein:

[0011] At least two first layering strips are respectively arranged on the first harmonica tube and the second harmonica tube, and are arranged on the same side;

[0012] At least two second beading layers are respectively arranged on a side of each first beading layer away from the liquid cooling plate. The second beading layers have a shrinkage deformation amount for absorbing the expansion force of the battery core.

[0013] Based on the above technical solution, preferably, the first bead layer is a polycarbonate layer, the second bead layer is a polyurethane foam layer, and the first bead layer is equal to the second bead layer and the liquid cooling plate in length.

[0014] On the basis of the above technical solution, preferably, a heat-conducting layer is further included, wherein the heat-conducting layer is arranged on the liquid cooling plate and located between two opposite second layering strips, and the heat-conducting layer is used to transfer the heat of the battery cell to the heat exchange channel.

[0015] On the basis of the above technical solution, preferably, the heat-conducting layer is a heat-conducting structural adhesive, and the sum of the thickness of the first layer and the second layer is greater than the thickness of the heat-conducting layer.

[0016] On the basis of the above technical solution, preferably, a plurality of gaskets are further included, wherein the plurality of gaskets are arranged between each two adjacent liquid cooling plates, dividing the space between the two adjacent liquid cooling plates into a plurality of placement cavities, and a plurality of battery cells are respectively arranged in each placement cavity, and the battery cells are in contact with the gaskets, the second layer and the heat conductive layer.

[0017] On the basis of the above technical solution, preferably, it further includes a plurality of bamboo pipes, a main water inlet pipe and a main water outlet pipe, wherein,

[0018] The liquid cooling plate is provided with two connecting pipe heads, both of which penetrate the liquid cooling plate and extend to the outside, one connecting pipe head is connected to the liquid inlet end of the heat exchange flow channel, and the other connecting pipe head is connected to the liquid outlet end of the heat exchange flow channel; a plurality of bamboo pipes are arranged between the two adjacent and oppositely arranged connecting pipe heads, and the bamboo pipes are connected to the connecting pipe heads, so that the plurality of heat exchange flow channels are interconnected;

[0019] One end of the main water inlet pipe is connected to the connecting pipe head at the liquid inlet end of the farthest liquid cooling plate, which is used to provide heat exchange medium to the liquid cooling plate; one end of the main water outlet pipe is connected to the connecting pipe head at the liquid outlet end of the farthest liquid cooling plate, which is used to circulate the heat exchange medium in the liquid cooling plate;

[0020] The main water inlet pipe and the main water outlet pipe are located on the same side and are arranged adjacent to each other.

[0021] On the basis of the above technical solution, preferably, the anti-collapse part is equal to the length of the first harmonica tube and the second harmonica tube, and the anti-collapse part and the first harmonica tube and the second harmonica tube are an integrally processed and formed structure, and the anti-collapse part is made of aluminum material and has a solid structure, and is the same material as the liquid cooling plate.

[0022] On the basis of the above technical solution, preferably, the size of the re-pressing component is 3mm*1200mm*0.5mm.

[0023] In a second aspect, the present invention further provides a battery pack, comprising a battery case and a battery cooling system as described above, wherein a cavity is provided in the battery case, and the battery cooling system and the battery cells are bonded in the cavity by structural adhesive.

[0024] The battery cooling system and battery pack of the present invention have the following advantages over the prior art:

[0025] (1) The design of the anti-collapse parts of the re-pressing components between the battery cells and the liquid cooling plate ensures that the expansion of the battery cells during charging and discharging can be effectively absorbed. At the same time, the application of the re-pressing components during the stacking process can ensure the stability of the size of the battery cells, improve the CTP assembly consistency and the safety of the battery pack;

[0026] (2) The first layer of beading is provided to ensure the consistency of the stacking size while ensuring the minimum glue pressing amount, thereby preventing the gap between the battery cell and the liquid cooling plate from being inconsistent, which affects the consistency of thermal conductivity. The second layer of beading is provided to absorb the expansion force of the battery;

[0027] (3) The heat-conducting layer is provided to fix the battery cell and the liquid cooling plate, and at the same time, heat is exchanged with the coolant in the liquid cooling plate during the battery cell charging and discharging process, thereby ensuring the effectiveness of the heat dissipation of the battery cell;

[0028] (4) The provision of gaskets allows each battery cell to be placed and cooled individually, avoiding thermal interference between the battery cells and improving cooling efficiency. At the same time, it provides stable support for the battery cells, preventing them from being displaced or damaged due to vibration or expansion during charging and discharging, thereby improving the overall performance and reliability of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a three-dimensional diagram of the connection structure between the liquid cooling plate and the re-pressurization assembly of the present invention;

[0031] Figure 2 A three-dimensional diagram of the liquid cooling plate of the present invention;

[0032] Figure 3 This is a schematic diagram of the connection between the liquid cooling plate and the battery cell of the utility model;

[0033] Figure 4 A perspective view of the battery cooling system of the present invention;

[0034] Figure 5 This is a three-dimensional diagram of the bamboo tube of the present utility model;

[0035] Figure 6 This is a top view of the battery pack of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] like Figure 1-6 As shown, a battery cooling system of the present invention includes: a plurality of liquid cooling plates 1, which are arranged in sequence along the width extension direction thereof, and two adjacent liquid cooling plates 1 are spaced apart and arranged in parallel, and a heat exchange flow channel is provided in the liquid cooling plate 1; each liquid cooling plate 1 includes a first harmonica tube 11, a second harmonica tube 12 and an anti-collapse part 13, the first harmonica tube 11 and the second harmonica tube 12 are arranged opposite to and in parallel, and the two are connected to form a heat exchange flow channel, the anti-collapse part 13 is fixed between the first harmonica tube 11 and the second harmonica tube 12, and is used to absorb the expansion force of the battery cell; a plurality of re-pressing components 2 are respectively arranged on both sides of each liquid cooling plate 1, and the battery cell abuts between two adjacent re-pressing components 2, and the re-pressing component 2 is used to fix the battery cell and absorb the expansion force of the battery cell.

[0038] It should be noted that the heat exchange channel in the liquid cooling plate 1 is used to circulate the coolant, and the heat generated by the battery cells is taken away through the heat exchange between the coolant and the battery cells. The heat exchange structure design between the battery cells and the liquid cooling plate 1 and the battery cells ensures that the expansion of the battery cells during charging and discharging can be effectively absorbed. At the same time, the application of the re-pressing component 2 during the stacking process of the battery cells can ensure the dimensional stability, improve the CTP assembly consistency and the safety of the battery pack.

[0039] An anti-collapse part 13 is provided between the first harmonica tube 11 and the second harmonica tube 12. Both the direct current channel and the bending channel are parallelograms. When the parallelogram channel is squeezed by the expansion force of the battery cell, the flow channel will be deformed. When the deformed area reaches the anti-collapse part 13, since the anti-collapse part 13 is solid, when the battery cell expands to this point, the first harmonica tube 11 and the second harmonica tube 12 will not be further crushed, thereby preventing the liquid cooling plate from being crushed due to the expansion of the battery cell at the end of its life, thereby improving the stability of the cooling structure.

[0040] Each re-pressing assembly 2 in this embodiment includes at least two first beading layers 21 and a second beading layer 22, wherein at least two first beading layers 21 are respectively arranged on the first harmonica tube 11 and the second harmonica tube 12, and are arranged on the same side; at least two second beading layers 22 are respectively arranged on the side of each first beading layer 21 away from the liquid cooling plate 1, and the second beading layer 22 has a contraction deformation amount for absorbing the expansion force of the battery cell.

[0041] Specifically, in this embodiment, the first bead layer 21 is a polycarbonate layer, the second bead layer 22 is a polyurethane foam layer, and the first bead layer 21 and the second bead layer 22 are equal in length to the liquid cooling plate 1 .

[0042] It should be noted that the re-pressing component 2 is made of a polycarbonate layer and a polyurethane foam layer. The first layer 21 is made of polycarbonate material. Polycarbonate has high strength, high toughness, good heat resistance and weather resistance, and is suitable as a layer that withstands pressure and maintains structural stability. During the battery cell stacking process, the first layer 21 can ensure the consistency of the stacking size while ensuring the minimum amount of glue, thereby preventing inconsistent gaps between the battery cell and the liquid cooling plate 1, which affects the consistency of thermal conductivity. The second layer 22 is made of polyurethane foam material. The polyurethane foam layer can undergo corresponding deformation to absorb this part of the expansion force, thereby protecting the battery cell and the entire battery pack from damage and improving safety.

[0043] Specifically, the size of the re-pressing component 2 in this embodiment is 3 mm*1200 mm*0.5 mm.

[0044] This embodiment further includes a heat-conducting layer 23 , wherein the heat-conducting layer 23 is provided on the liquid cooling plate 1 and located between two opposite second layering strip layers 22 . The heat-conducting layer 23 is used to transfer heat from the battery cell to the heat exchange channel.

[0045] Specifically, the heat-conducting layer 23 in this embodiment is a heat-conducting structural adhesive, and the sum of the thicknesses of the first layer 21 and the second layer 22 is greater than the thickness of the heat-conducting layer 23 by 0.1 mm.

[0046] It should be noted that the heat conductive layer 23 fixes the battery cell and the liquid cooling plate 1 and exchanges heat with the coolant in the liquid cooling plate 1 during the battery cell charging and discharging process, thereby ensuring the effectiveness of heat dissipation of the battery cell.

[0047] This embodiment also includes a plurality of gaskets 4, wherein the plurality of gaskets 4 are arranged between each two adjacent liquid cooling plates 1, dividing the space between the two adjacent liquid cooling plates 1 into a plurality of placement cavities, and a plurality of battery cells are respectively arranged in each placement cavity, and the battery cells are in contact with the gaskets 4, the second layer 22 and the thermal conductive layer 23.

[0048] It should be noted that the gasket 4 separates the adjacent liquid cooling plates 1 to form an independent placement cavity, so that each battery cell can be placed and cooled separately, avoiding thermal interference between the battery cells and improving the cooling efficiency. At the same time, the gasket 4 provides stable support for the battery cells, preventing the battery cells from being displaced or damaged due to vibration or expansion during the charging and discharging process, thereby improving the overall performance and reliability of the battery pack.

[0049] This embodiment also includes a plurality of bamboo-joint pipes 5, wherein two connecting pipe heads are provided on the liquid cooling plate 1, both connecting pipe heads pass through the liquid cooling plate 1 and extend to the outside, one connecting pipe head is connected to the liquid inlet end of the heat exchange channel, and the other connecting pipe head is connected to the liquid outlet end of the heat exchange channel; a plurality of bamboo-joint pipes 5 are arranged between two adjacent and oppositely arranged connecting pipe heads, and the bamboo-joint pipes 5 are connected to the connecting pipe heads, so that a plurality of heat exchange channels are interconnected.

[0050] This embodiment also includes a main water inlet pipe 6 and a main water outlet pipe 7, wherein one end of the main water inlet pipe 6 is connected to the connecting pipe head at the liquid inlet end of the farthest liquid cooling plate 1, for providing heat exchange medium to the liquid cooling plate; one end of the main water outlet pipe 7 is connected to the connecting pipe head at the liquid outlet end of the farthest liquid cooling plate 1, for circulation of heat exchange medium in the liquid cooling plate; the main water inlet pipe 6 and the main water outlet pipe 7 are located on the same side and are arranged adjacent to each other.

[0051] It should be noted that the entire system adopts a fully parallel design from front to back liquid cooling plate, and the main water inlet pipe 6 and the main water outlet pipe 8 are both on a single side of the liquid cooling plate. The advantage of this is that the assembly pipeline area is all on a single collector of the liquid cooling plate. The single collector is processed by an integrated machine with high precision, which solves the problem of high difficulty requirements for pipe crimping process due to entry and exit from both sides, and improves the space utilization of the battery pack.

[0052] In this embodiment, the anti-collapse member 13 is equal in length to the first harmonica tube 11 and the second harmonica tube 12, and the anti-collapse member 13 and the first harmonica tube 11 and the second harmonica tube 12 are integrally processed and formed. The anti-collapse member 13 is made of aluminum material and has a solid structure, and is made of the same material as the liquid cooling plate 1.

[0053] Secondly, the present invention also provides a battery pack, including a battery case 8 and a battery cooling system, wherein a cavity 800 is opened in the battery case 8, and the battery cooling system and battery cells are bonded in the cavity 800 by structural adhesive.

[0054] It should be noted that the thickness of the structural adhesive covering the bottom of the inner surface of the battery box 8 is 1 mm, wherein the battery cooling system is fixed to the bottom of the inner surface of the battery box 8 by hoisting.

[0055] Working principle:

[0056] The first layer 21 is made of polycarbonate material to ensure the consistency of the stacking size. The second layer 22 is made of polyurethane foam material, which can absorb the expansion force of the battery. The thermal conductive layer 23 fixes the battery cell and the liquid cooling plate 1 while exchanging heat with the coolant in the liquid cooling plate 1 during the charging and discharging process of the battery cell. The gasket 4 separates the adjacent liquid cooling plates 1 to form an independent placement cavity, so that each battery cell can be placed and cooled separately.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery cooling system, characterized in that: include: A plurality of liquid cooling plates (1) are arranged in sequence along a width extension direction thereof, and two adjacent liquid cooling plates (1) are spaced apart and arranged in parallel, and a heat exchange flow channel is provided in the liquid cooling plates (1); Each liquid cooling plate (1) comprises a first harmonica tube (11), a second harmonica tube (12) and an anti-collapse member (13); the first harmonica tube (11) and the second harmonica tube (12) are arranged opposite to and in parallel with each other, and the two are connected to form a heat exchange flow channel; the anti-collapse member (13) is fixed between the first harmonica tube (11) and the second harmonica tube (12) and is used to absorb the expansion force of the battery core; A plurality of re-pressing assemblies (2) are arranged on both sides of each liquid cooling plate (1), and the battery core is abutted between two adjacent re-pressing assemblies (2). The re-pressing assemblies (2) are used to fix the battery core and absorb the expansion force of the battery core.

2. The battery cooling system according to claim 1, wherein: Each of the composite pressing components (2) comprises at least two first layering strips (21) and a second layering strips (22), wherein: At least two first layering strip layers (21) are respectively arranged on the first harmonica tube (11) and the second harmonica tube (12), and are arranged on the same side; At least two second layering strips (22) are arranged on a side of each first layering strip (21) away from the liquid cooling plate (1), and the second layering strips (22) have a contraction deformation amount for absorbing the expansion force of the battery core.

3. The battery cooling system according to claim 2, wherein: The first bead layer (21) is a polycarbonate layer, the second bead layer (22) is a polyurethane foam layer, and the first bead layer (21), the second bead layer (22) and the liquid cooling plate (1) are of equal length.

4. The battery cooling system according to claim 3, wherein: It also includes a heat-conducting layer (23), wherein the heat-conducting layer (23) is arranged on the liquid cooling plate (1) and is located between two opposite second layering strip layers (22), and the heat-conducting layer (23) is used to transfer the heat of the battery core to the heat exchange channel.

5. The battery cooling system according to claim 4, wherein: The heat-conducting layer (23) is a heat-conducting structural adhesive, and the sum of the thicknesses of the first layer (21) and the second layer (22) is greater than the thickness of the heat-conducting layer (23).

6. The battery cooling system according to claim 5, wherein: It also includes a plurality of gaskets (4), wherein the plurality of gaskets (4) are arranged between each two adjacent liquid cooling plates (1), dividing the space between the two adjacent liquid cooling plates (1) into a plurality of placement cavities, and the plurality of battery cells are respectively arranged in each placement cavity, and the battery cells are in contact with the gaskets (4), the second layer (22) and the heat conducting layer (23).

7. The battery cooling system according to claim 1, wherein: It also includes a number of bamboo pipes (5), a main water inlet pipe (6) and a main water outlet pipe (7), wherein: The liquid cooling plate (1) is provided with two connecting pipe heads, both of which penetrate the liquid cooling plate (1) and extend to the outside, one connecting pipe head being connected to the liquid inlet end of the heat exchange flow channel, and the other connecting pipe head being connected to the liquid outlet end of the heat exchange flow channel; a plurality of bamboo pipes (5) are arranged between the two adjacent and oppositely arranged connecting pipe heads, and the bamboo pipes (5) are connected to the connecting pipe heads, so that the plurality of heat exchange flow channels are interconnected; One end of the main water inlet pipe (6) is connected to the connecting pipe head at the liquid inlet end of the most distal liquid cooling plate (1) for supplying heat exchange medium to the liquid cooling plate; one end of the main water outlet pipe (7) is connected to the connecting pipe head at the liquid outlet end of the most distal liquid cooling plate (1) for circulating the heat exchange medium in the liquid cooling plate; The main water inlet pipe (6) and the main water outlet pipe (7) are located on the same side and are arranged adjacent to each other.

8. The battery cooling system according to claim 1, wherein: The anti-collapse part (13) is equal in length to the first harmonica tube (11) and the second harmonica tube (12), and the anti-collapse part (13) and the first harmonica tube (11) and the second harmonica tube (12) are integrally formed. The anti-collapse part (13) is made of aluminum material and has a solid structure, and is made of the same material as the liquid cooling plate (1).

9. The battery cooling system according to claim 1, wherein: The size of the re-pressing component 2 is 3mm*1200mm*0.5mm.

10. A battery pack, characterized in that: It comprises a battery case (8) and a battery cooling system according to any one of claims 1 to 9, wherein a cavity (800) is opened in the battery case (8), and the battery cooling system and the battery cell are bonded in the cavity (800) by structural adhesive.

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