CCS integrated busbar integrated with liquid cooling function of battery pack and battery pack

Abstract

The utility model discloses a CCS integrated busbar integrated with a liquid cooling function of a battery pack and the battery pack. The CCS integrated busbar integrating the liquid cooling function of the battery pack comprises a CCS multifunctional support, a round busbar assembly and an FPC assembly which are sequentially arranged from bottom to top, and a hollow flow channel used for providing cooling liquid for battery liquid cooling is formed in the CCS multifunctional support. According to the CCS integrated busbar integrated with the liquid cooling function of the battery pack, the liquid cooling plate and the CCS integrated busbar are combined into a whole by integrating the hollow flow channel for liquid cooling in the CCS integrated busbar, so that a battery cell and a busbar are cooled at the same time, and the battery cell and the busbar can be cooled at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a CCS integrated busbar with an integrated liquid cooling function for a battery pack and a battery pack. Background Art

[0002] As the core component of electric vehicles, the performance and stability of power batteries have an important impact on the safety and endurance of the entire vehicle. At present, the integrated busbar structure CCS (Cells Contact System, integrated busbar, wiring harness board integration, also known as battery cover assembly) of power batteries mainly integrates the busbar, FPC collection, and bracket into an integrated design, which has a certain degree of integration and reduces the structural weight and cost; the integrated busbar, the conductive busbar in the battery pack, the control circuit (voltage, temperature collection) and other components are integrated into a module to realize the high-voltage series and parallel connection of the battery cells, as well as the battery temperature sampling, battery cell voltage sampling, and overcurrent fuse functions.

[0003] Integrating the liquid cooling function on the CCS component and the integrated busbar with liquid cooling structure can further improve the integration of the battery, more effectively reduce the battery temperature, and improve the battery cycle life and safety, which is of great significance to the development of electric vehicles. The current integrated busbar liquid cooling solution is to set the CCS component on one side of the liquid cooling device, the CCS component is electrically connected to the battery cell, and the liquid cooling device and the CCS component are stacked in sequence to integrate the upper cover structure of the battery; this solution does not change the essence of the cold plate and CCS being two components, but only adjusts the structure and layout to make it occupy less space. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies and defects of the prior art and to provide a CCS integrated busbar and a battery pack with an integrated liquid cooling function for a battery pack.

[0005] In a first aspect of the utility model, a CCS integrated busbar with integrated liquid cooling function of a battery pack is provided, wherein the CCS integrated busbar comprises a CCS multifunctional bracket, a circular bus assembly, and an FPC assembly arranged in sequence from bottom to top, and the CCS multifunctional bracket has a hollow flow channel inside for providing coolant for battery liquid cooling.

[0006] The hollow flow channel passes through the CCS multifunctional bracket and is obliquely arranged from one end of the CCS multifunctional bracket to the other end.

[0007] Wherein, the hollow flow channel is arranged conformally inside the non-hollow area of ​​the CCS multifunctional bracket.

[0008] Wherein, the CCS multifunctional bracket is provided with a coolant inlet and outlet interface which is in communication with the hollow flow channel.

[0009] The coolant inlet and outlet interface is arranged side by side with the interface of the FPC component.

[0010] Among them, a coolant inlet interface is arranged at one end of the CCS multifunctional bracket, and a coolant outlet interface is arranged at the other end.

[0011] The CCS multifunctional bracket is made of metal / non-metallic material, and the surface of the CCS multifunctional bracket made of metal material is subjected to insulation spraying to form an insulation spraying layer.

[0012] Wherein, the battery pack is a battery pack composed of cylindrical batteries or square batteries.

[0013] Among them, when used in a battery pack composed of square battery cells, the CCS multifunctional bracket forms a weak structure. When the battery cell suffers from thermal runaway, the high-temperature and high-pressure gas sprayed out will break through the weak position, causing the coolant in the hollow flow channel to flow rapidly to the thermal runaway battery cell.

[0014] A second aspect of the present invention provides a battery pack, comprising a CCS integrated busbar with an integrated liquid cooling function of the battery pack described in the first aspect of the present invention.

[0015] The CCS integrated busbar with integrated liquid cooling function of the battery pack of the utility model integrates a hollow flow channel for liquid cooling inside the CCS integrated busbar, so that the liquid cooling plate and the CCS integrated busbar are combined into one, thereby realizing simultaneous cooling of the battery cells and the busbar, and can meet the cooling requirements of both the battery cells and the busbar at the same time without reducing the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 An exploded view of the CCS integrated busbar with integrated liquid cooling function of the cylindrical battery pack of the utility model.

[0017] Figure 2 for Figure 1 A partial view of the cylindrical battery cell and circular busbar assembly.

[0018] Figure 3 for Figure 2 A partial enlarged view of the .

[0019] Figure 4 for Figure 1 A partial view of a cylindrical cell and round busbar assembly with the bottom side facing upward.

[0020] Figure 5 for Figure 4 A partial enlarged view of the .

[0021] Figure 6 for Figure 1 Flow diagram of the coolant inside the cylindrical battery cell and round bus assembly.

[0022] Figure 7 for Figure 1 Schematic diagram of the connection between the CCS integrated busbar with integrated liquid cooling function of the cylindrical battery pack and the top of the cylindrical battery cell.

[0023] Figure 8 Schematic diagram of the liquid cooling pipeline connection of the CCS integrated busbar with multiple integrated liquid cooling functions for cylindrical battery packs.

[0024] Fig. 9 An exploded view of the CCS integrated busbar with integrated liquid cooling function of the square battery pack of the utility model.

[0025] Fig.10 for Fig. 9 A partial view of the square cell round bus assembly.

[0026] Fig.11 for Fig.10 A partial enlarged view of the .

[0027] Fig.12 for Fig. 9 A partial view of the square cell round bus assembly with the bottom side facing upward.

[0028] Fig.13 for Fig.12 A partial enlarged view of the .

[0029] Fig.14 for Fig. 9 Schematic diagram of the connection between the CCS integrated busbar with integrated liquid cooling function and the top of the square battery cell in the square battery pack.

[0030] Fig.15 Schematic diagram of the liquid cooling pipeline connection of the CCS integrated busbar with multiple integrated liquid cooling functions for the square battery pack. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] Below, the cylindrical battery cell 1 is taken as an example to illustrate the implementation of the technical solution of the present application.

[0033] like Figures 1 to 8As shown, the CCS integrated busbar with integrated liquid cooling function of the battery pack of the embodiment of the utility model is used for the battery pack formed by cylindrical cells. The cylindrical cells 1 are arranged below the integrated busbar. The CCS integrated busbar includes a cylindrical cell CCS multifunctional bracket 2, a cylindrical cell round bus assembly 3, and a cylindrical cell FPC assembly 4 arranged from bottom to top. The cylindrical cell CCS multifunctional bracket has a first hollow flow channel 21 for providing coolant for battery liquid cooling, see Figure 2 , Figure 3 shown.

[0034] like Figure 2 , 3 As shown, the first hollow flow channel 21 runs through the interior of the cylindrical battery cell CCS multifunctional bracket, and is obliquely arranged from one end of the cylindrical battery cell CCS multifunctional bracket to the other end. Preferably, it is arranged in a conformal manner inside the non-hollow area of ​​the CCS multifunctional bracket. The flow channel height is 2-3mm. In order to minimize the flow resistance of the coolant, there is no other reinforcing rib structure in the middle of the first hollow flow channel 21.

[0035] The cylindrical battery cell CCS multifunctional bracket 2 is made of insulating material, which can be high-strength plastic, nylon, or a metal material with an insulating spray-coated surface, that is, insulating spraying is performed on the surface of the CCS multifunctional bracket to form an insulating spray layer; the coolant inside the flow channel 21 can be an ethylene glycol solution commonly used in liquid cooling, or an R134a refrigerant suitable for a direct cooling solution.

[0036] like Figure 4 , 5 As shown, the cylindrical battery cell CCS multifunctional bracket 2 is provided with a first coolant inlet and outlet interface 22 which is communicated with the first hollow flow channel 21. The first coolant inlet and outlet interface 22 can be composed of two small-diameter interfaces, and can also be designed as a single interface if the space structure permits; there is one coolant inlet and outlet interface at each end of the cylindrical battery cell CCS multifunctional bracket, and the two interfaces have the same specifications, and one end can be selected as the liquid inlet or outlet according to the design plan.

[0037] like Figure 6 As shown, the Figure 6 The diagram shows the coolant flow direction in the CCS integrated busbar with integrated liquid cooling function of the battery pack. The coolant flows obliquely from one end to the other end for cooling. This oblique coolant flow direction has two main advantages: first, the oblique flow direction can ensure better flow uniformity in the entire cooling channel, and there will be no situation where the flow on one side is smaller; second, since the width of the entire integrated busbar is limited, it can better save space and reduce space occupancy. Preferably, in the present application, the coolant inlet and outlet interface 22 is arranged side by side with the interface of the FPC assembly 4.

[0038] In general, the cold plate flow channel will have ribs that separate the flow channel. The most typical type of cold plate flow channel is the harmonica tube type. However, the harmonica tube cooling can only be applied in a regular cooling cavity, and for the sake of cold plate strength, the flow channel width cannot be too wide, which results in a large flow resistance if the size of the cooled object is long. The first hollow flow channel 21 in the present application is a free-standing design. Due to its good structural stability and strength, there are no ribs for the flow channel inside, so that the maximum coolant flow space can be obtained in the limited cooling wall. The overall CCS integrated busbar width is designed to be narrow, which greatly reduces the possibility of poor temperature uniformity in the width direction. The present application avoids excessive flow resistance in complex areas; it can adjust the coolant flow direction and control the overall CCS integrated busbar width to ensure better cooling temperature uniformity, thereby solving the problem of large flow resistance and poor temperature uniformity in ordinary integrated cooling.

[0039] like Figure 7 As shown, when the CCS integrated busbar of the present application is connected to the cylindrical battery cell of the battery pack, the cylindrical battery cell 1 and the cylindrical battery cell CCS multifunctional bracket 2 are connected and fixed by the first thermal conductive structural adhesive 5. The first thermal conductive structural adhesive 5 can not only play the function of heat transfer, but also firmly fix the cylindrical battery cell 1, and provide good rigid support for the upper first hollow flow channel 21, thereby solving the problems of difficult fixing of the cylindrical battery cell and poor vibration resistance, and effectively preventing the failure of welding between the CCS integrated busbar and the battery cell during vibration of the battery system.

[0040] Among them, the cylindrical battery pack composed of cylindrical cells includes multiple connected cylindrical cells, and the cylindrical cells are arranged in multiple rows. In the width direction of the battery pack, preferably, each of the CCS integrated busbars is connected to 2-3 rows of cylindrical cell groups, so that the width of the CCS integrated busbar can be appropriate, the flow distribution in each part of its internal flow channel is more uniform, and the cooling temperature uniformity is good.

[0041] See also Figure 8 As shown in FIG. 1 , the cooling circuit of the cylindrical battery pack with CCS integrated busbar using the integrated liquid cooling function of the battery pack is as follows Figure 8 As shown, the total inlet and outlet water pipelines are divided into Figure 8 On the left and right sides shown in the figure, each branch is connected to the first coolant inlet and outlet interface 22 on the CCS integrated busbar to form a liquid cooling structure; wherein the coolant flows as shown in FIG. Figure 8 As indicated by the arrow in .

[0042] This embodiment adopts CCS highly integrated busbar, and integrates the busbar, liquid cooling plate, FPC assembly and multi-functional bracket in the cylindrical battery system into one component, which can meet the heat dissipation requirements of the battery cell. The integration can save the space of the traditional liquid cooling plate and improve the space utilization rate of the cylindrical battery pack; and solves the problem that in the current battery cell top cooling solution, the separately adjusted top cold plate needs to avoid the battery cell poles and busbars, which is inconvenient to arrange.

[0043] An embodiment of the utility model provides a cylindrical battery pack, including a CCS integrated busbar with an integrated liquid cooling function of the cylindrical battery pack of the utility model.

[0044] The cylindrical battery pack of this embodiment adopts CCS highly integrated busbar, and integrates the busbar, liquid cooling plate, FPC assembly and multi-functional bracket in the cylindrical battery system into one component, which can meet the heat dissipation requirements of the battery cell. The integration can save the space of the traditional liquid cooling plate and improve the space utilization rate of the cylindrical battery pack; and it solves the problem that in the current battery cell top cooling solution, the separately adjusted top cold plate needs to avoid the battery cell poles and busbars, which is inconvenient to arrange.

[0045] Below, the implementation of the technical solution of the present application is explained by taking a square battery cell as an example.

[0046] See also Figures 9 to 15 As shown, the CCS integrated busbar with integrated liquid cooling function of the battery pack of the present application is used for a square battery pack formed by square cells, which are arranged from bottom to top as a square cell CCS multifunctional bracket 7, a square cell busbar assembly 8, and a square cell FPC assembly 9, as shown in FIG. Fig. 9 As shown, the square battery CCS multifunctional bracket 7 has a second hollow flow channel 71, such as Fig.10 , Fig.11 As shown, the flow channel height and material are consistent with the aforementioned cylindrical battery CCS multifunctional bracket 2. The second hollow flow channel runs through the entire square battery CCS multifunctional bracket. The flow channel height is 2-3mm. In order to minimize the flow resistance of the coolant, there is no other reinforcing rib structure in the middle of the flow channel. The square battery CCS multifunctional bracket is made of insulating material, which can be high-strength plastic, nylon, or metal material with insulating spray on the surface; the coolant inside the flow channel is an insulating liquid.

[0047] When forming a battery pack, the expansion valve of the square battery cell 6 is located at the top, so a weak structure 73 is made on the square battery cell CCS multifunctional bracket 7 corresponding to the position of the battery expansion valve. Fig.11 As shown, when thermal runaway occurs, the explosive high-temperature and high-pressure gas will break through the weak structure 73, and the insulating coolant in the second hollow flow channel 71 will quickly flow to the thermal runaway battery cell, playing a role in cooling and extinguishing fire, and preventing heat diffusion and heat spread.

[0048] like Fig.12 , Fig.13 As shown, a second coolant inlet and outlet interface 72 is integrated on the back of the square battery CCS multifunctional bracket 7. Fig.12 , Fig.13The second coolant inlet and outlet interface 72 is composed of two small interfaces, and can be designed as a single interface if the space structure permits; there is a second coolant inlet and outlet interface at each end of the square battery cell CCS multifunctional bracket, and the two interfaces have the same specifications, and one end can be selected as the water inlet or outlet according to the design plan.

[0049] Among them, the first hollow flow channel inside the square battery CCS integrated busbar, its coolant flow direction, interface layout, etc. are consistent with the aforementioned cylindrical battery CCS multifunctional bracket 2, which can not only avoid the position of the battery cell poles, but also provide a low flow resistance design scheme. Conventional cold plate flow channels are not used, so that the cooling efficiency of the CCS integrated busbar will not be reduced after the cooling function is provided, avoiding excessive flow resistance in complex areas; by optimizing and controlling the overall width of the CCS integrated busbar and the diagonal flow direction of the coolant, the cooling uniformity can be ensured.

[0050] like Fig.14 As shown, the square battery cell CCS multifunctional bracket is connected to the square battery cell to form a square battery pack. The square battery cell 6 and the square battery cell CCS multifunctional bracket 7 are connected and fixed by the second thermal conductive structural adhesive 10. The second thermal conductive structural adhesive 10 can not only play the function of heat transfer, but also firmly fix the square battery cell 6, effectively preventing the failure of welding between the CCS integrated busbar and the battery cell during vibration of the battery system.

[0051] Among them, the square battery pack includes the above-mentioned square battery cell CCS integrated busbar and a row of square battery cell groups, and the square battery cell group includes a plurality of connected square batteries 6; each of the integrated busbars is connected to a row of square battery cell groups, so that the width of the CCS integrated busbar is appropriate, the flow distribution at each location of the second hollow flow channel 71 is more uniform, and the cooling temperature uniformity is good.

[0052] See also Fig.15 As shown in the figure, the cooling pipeline of the square battery pack of the CCS integrated busbar with integrated liquid cooling function of the battery pack is divided into the inlet and outlet water pipelines. Fig.15 On the left and right sides of the coolant, each branch is connected to the interface on the CCS integrated busbar; the coolant flows as follows Fig.15 As indicated by the arrow in .

[0053] This embodiment adopts CCS highly integrated busbar, which integrates the busbar, liquid cooling plate, FPC assembly and multi-functional bracket in the battery system into one component, which can meet the heat dissipation requirements of the battery cell. The integration can save the space of the traditional liquid cooling plate and improve the space utilization rate of the square battery pack. It also solves the problem that in the current battery cell top cooling solution, the separately adjusted top cold plate needs to avoid the battery cell poles and busbars, which is inconvenient to arrange.

[0054] An embodiment of the utility model provides a square battery pack, including a CCS integrated busbar with an integrated liquid cooling function of the square battery pack of the utility model.

[0055] The square battery pack of this embodiment integrates the bus, liquid cooling plate, FPC assembly and multi-functional bracket in the battery system into one component, which can meet the heat dissipation requirements of the battery cell. The integration can save the space of the traditional liquid cooling plate and improve the space utilization rate of the square battery pack; and solves the problem that in the current battery cell top cooling solution, the separately adjusted top cold plate needs to avoid the battery cell poles and bus, which is inconvenient to arrange.

[0056] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model.

[0057] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A CCS integrated busbar with integrated liquid cooling function for a battery pack, the CCS integrated busbar comprising a CCS multifunctional bracket, a round busbar assembly, and an FPC assembly arranged in sequence from bottom to top, characterized in that: The CCS multifunctional bracket has a hollow flow channel inside for providing coolant for battery liquid cooling.

2. According to claim 1, the CCS integrated busbar with integrated liquid cooling function of the battery pack is characterized in that: The hollow flow channel passes through the CCS multifunctional bracket and is obliquely arranged from one end of the CCS multifunctional bracket to the other end.

3. The CCS integrated busbar with integrated liquid cooling function of the battery pack according to claim 1, characterized in that: The hollow flow channel is arranged conformally inside the non-hollow area of ​​the CCS multifunctional bracket.

4. The CCS integrated busbar with integrated liquid cooling function of the battery pack according to claim 1, characterized in that: The CCS multifunctional bracket is provided with a coolant inlet and outlet interface communicating with the hollow flow channel.

5. The CCS integrated busbar with integrated liquid cooling function of the battery pack according to claim 4, characterized in that: The cooling liquid inlet and outlet interface is arranged side by side with the interface of the FPC component.

6. The CCS integrated busbar with integrated liquid cooling function of the battery pack according to claim 1, characterized in that: A coolant inlet interface is arranged at one end of the CCS multifunctional bracket, and a coolant outlet interface is arranged at the other end.

7. The CCS integrated busbar with integrated liquid cooling function of the battery pack according to claim 1, characterized in that: The CCS multifunctional bracket is made of metal / non-metallic material, and the surface of the CCS multifunctional bracket made of metal material is subjected to insulation spraying to form an insulation spraying layer.

8. The CCS integrated busbar with integrated liquid cooling function of the battery pack according to claim 1, characterized in that: The battery pack is a battery pack composed of cylindrical batteries or square batteries.

9. The CCS integrated busbar with integrated liquid cooling function of the battery pack according to claim 8, characterized in that: When used in a battery pack composed of square cells, the CCS multifunctional bracket forms a weak structure. When thermal runaway occurs in the cell, the high-temperature and high-pressure gas sprayed out will break through the weak position, allowing the coolant in the hollow flow channel to quickly flow to the thermal runaway cell.

10. A battery pack, characterized in that: A CCS integrated busbar with integrated liquid cooling function comprising the battery pack according to any one of claims 1 to 9.

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