CTP battery pack

Abstract

The utility model provides a CTP battery pack. The CTP battery pack comprises a battery cell; the water cooling plate is provided with an n-shaped buffer component, and the battery cell is connected with the water cooling plate; the bottom bearing mechanism comprises a framework and a bottom plate, the framework is connected with the bottom plate, the framework comprises a cross beam and a longitudinal beam, the cross beam is provided with an exhaust component, the cross beam comprises a first Z-shaped cross beam area and a second Z-shaped cross beam area, and the battery cell is connected with the exhaust component. The utility model aims at solving the problems of large occupied area and weak protection capability of the battery pack, and improving the structural integration strength and safety of the battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive battery packs, and more specifically, to a CTP battery pack. Background Art

[0002] As the "heart" of new energy vehicles, the technological progress of power battery packs is directly related to the performance and market competitiveness of vehicles. However, the traditional battery pack design has been difficult to meet the market demand in terms of structure, safety, etc.

[0003] As a new design solution, the CTP (Cell to Pack) battery pack technology brings new development opportunities to the new energy vehicle market by simplifying the battery pack structure, increasing the energy density, and reducing costs. However, the CTP battery pack still faces some technical challenges in practical applications. How to ensure the structural integration strength and safety of the battery pack, as well as the protection ability when the bottom is struck, is the key problem that needs to be solved in the design of the CTP battery pack. Summary of the Utility Model

[0004] The utility model provides a CTP battery pack, aiming to solve the problems of large occupied area and weak protection ability of the battery pack, and improve the structural integration strength and safety of the battery pack.

[0005] To achieve the above object, the utility model provides a CTP battery pack, including:

[0006] Cell;

[0007] Cold plate, the cold plate is provided with a several-shaped buffer component, and the cell is connected to the cold plate;

[0008] Bottom bearing mechanism, the bottom bearing mechanism includes a framework and a bottom plate, the framework is connected to the bottom plate, the framework includes cross beams and longitudinal beams, the cross beams are provided with exhaust components, the cross beams include a first Z-shaped cross beam area and a second Z-shaped cross beam area, and the cell is connected to the exhaust components.

[0009] In one embodiment, the cross beams and longitudinal beams are placed outside the cell;

[0010] The first Z-shaped cross beam area is close to the cell, and the height of the first Z-shaped cross beam area is not lower than the height of the cell;

[0011] The second Z-shaped cross beam area is a sealing surface, and the height of the second Z-shaped cross beam area is consistent with that of the longitudinal beam.

[0012] In one embodiment, the cross beam and the cell are clamped and connected, and an energy absorption gap is provided between the longitudinal beam and the cell.

[0013] In one embodiment, the cold plate includes a flow channel, a flow channel plate, a cover plate, and a guard plate. A cavity is provided between the cover plate and the guard plate. The U-shaped buffer member is placed on the flow channel plate and between the cover plate and the guard plate, and the U-shaped buffer member is higher than the height of the flow channel.

[0014] In one embodiment, the battery cell is a detachable battery pack, and the detachable battery pack is a battery pack subjected to foaming treatment.

[0015] In one embodiment, the detachable battery pack is provided with a battery pack sealing unit.

[0016] In one embodiment, the exhaust component includes a thermal runaway pressure relief exhaust channel, an exhaust hole, and a pressure relief unit;

[0017] The thermal runaway pressure relief exhaust channel and the exhaust hole are provided in the first Z-shaped crossbeam area;

[0018] The pressure relief unit is provided in the second Z-shaped crossbeam area.

[0019] In one embodiment, the pressure relief unit includes a pressure relief valve, and the pressure relief valve is connected to the thermal runaway pressure relief exhaust channel.

[0020] In one embodiment, the crossbeam and the longitudinal beam are made of aluminum alloy.

[0021] In one embodiment, the first Z-shaped crossbeam area is configured with an insulating spacer or a clamping fixing block.

[0022] The present utility model has the following beneficial effects:

[0023] 1. Strong protection: The cold plate is provided with a U-shaped buffer member for protection when being struck at the bottom, which can effectively deform and absorb energy, protect the flow channel, protect the cold plate and the battery cell, and ensure safety and reliability in mechanical collisions.

[0024] 2. High integration: The cold plate and its architecture exhibit extremely high integration, integrating structural support and thermal management functions, saving fixing brackets, increasing space utilization, and further reducing the required space by integrating functions such as structural support, battery cell thermal runaway exhaust, and pressure relief valve fixing, significantly improving the space efficiency of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the bottom bearing unit of the CTP battery pack according to an embodiment of the present utility model;

[0026] Figure 2 It is a schematic structural diagram of the cold plate of the CTP battery pack according to an embodiment of the present utility model;

[0027] Figure 3Schematic diagram of the architecture structure of a CTP battery pack according to an embodiment of the present utility model.

[0028] Among them, 11 is the bottom cover plate; 12 is a "ji"-shaped reinforcing beam; 13 is a heat-insulating foam; 14 is a flat guard plate; 21 is a cover; 22 is an explosion-proof valve; 23 is a longitudinal beam; 24 is a cross beam; 241 is the first Z-shaped cross beam area; 242 is the second Z-shaped cross beam area; 243 is the inner cavity of the cross beam; 244 is the explosion-proof valve mounting hole; 245 is a vent port; 25 is an on-line foaming sealant strip; 26 is a weld seam; 3 is a cold water plate; 31 is a water outlet; 32 is a water inlet; 33 is a weld bead area; 34 is a water pipe joint; 35 is a "ji"-shaped buffer component. Detailed implementation manners

[0029] To make the purposes, technical solutions, and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings in the embodiments of this application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The described embodiments are some, but not all, of the embodiments of this application. The embodiments described below by referring to the drawings are exemplary and are intended to explain this application and should not be construed as limiting this application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0030] Figure 1 Schematic diagram of the structure of a CTP battery pack according to an embodiment of the present utility model, the CTP battery pack includes:

[0031] Electric cores;

[0032] A cold water plate, the cold water plate 3 is provided with a "ji"-shaped buffer component 35, and the electric core is connected to the cold water plate;

[0033] A bottom bearing mechanism, the bottom bearing mechanism includes a framework and a bottom plate, the framework is connected to the bottom plate, the framework includes a cross beam 24 and a longitudinal beam 23, the cross beam 24 is provided with an exhaust component, the cross beam 24 includes a first Z-shaped cross beam area 241 and a second Z-shaped cross beam area 242, and the electric core is connected to the exhaust component.

[0034] Furthermore, in the vehicle structure, the welding section of the longitudinal beam 23 and the cross beam 24 and the sealing surface of the longitudinal beam 23 and the cross beam 24 need to maintain precise dimensional matching. Given the envelope limitation of the vehicle design, when the size of the sealing surface of the longitudinal beam 23 and the cross beam 24 is limited by the height of the electric core pole winding, it is recommended to adopt the Z-shaped cross beam 24 structure design to ensure the sealing performance and structural stability.

[0035] Furthermore, as Figure 3As shown, within the first Z-shaped crossbeam region 241, we adopt an integrated design, integrating a pressure relief and exhaust channel in the event of thermal runaway, and simultaneously ensuring the integrity of the main sealing structure of the battery pack to achieve efficient thermal management and excellent sealing performance.

[0036] In one embodiment, the crossbeam 24 and the longitudinal beam 23 are disposed outside the battery cells.

[0037] The first Z-shaped crossbeam region 241 is close to the battery cells, and the height of the first Z-shaped crossbeam region 241 is not lower than the height of the battery cells.

[0038] The second Z-shaped crossbeam region 242 is a sealing surface, and the height of the second Z-shaped crossbeam region 242 is consistent with that of the longitudinal beam 23.

[0039] Furthermore, the Z-shaped crossbeam is divided into two height intervals. The first Z-shaped crossbeam region 241 is close to the battery cell region, and its height should not be lower than the height of the battery cell pole winding. The second Z-shaped crossbeam region 242 is a sealing surface interval, and its height is consistent with that of the longitudinal beam 23.

[0040] In one embodiment, the crossbeam 24 and the battery cells are clamped and connected, and an energy-absorbing gap is provided between the longitudinal beam 23 and the battery cells.

[0041] Furthermore, the end of the longitudinal beam 23 and the adjacent ends of the two crossbeams 24 are connected by welding.

[0042] Furthermore, the longitudinal beam 23 and the crossbeam 24 are wrapped around the periphery of the battery cells, and the crossbeam 24 clamps the battery cells. A certain gap is reserved between the longitudinal beam 23 and the battery cells for energy absorption during side collisions. The height of the crossbeam 24 should be at least not lower than the height of the battery cell pole winding to prevent uneven stress on the battery cells.

[0043] In one embodiment, as Figure 2 shown, the cold plate 3 includes a flow channel, a flow channel plate, a cover plate, and a guard plate. A cavity is provided between the cover plate and the guard plate. The U-shaped buffer member 35 is placed on the flow channel plate and is located between the cover plate and the guard plate. The U-shaped buffer member 35 is higher than the height of the flow channel.

[0044] To further optimize the structural design, a U-shaped buffer member 35 is integrated on the outer surface of the flow channel plate of the cold plate 3 by an adhesive technique, and its cross-sectional shape conforms to the U shape. This buffer structure is fixed by a professional bonding process to ensure firmness and reliability. In terms of layout, this buffer member is precisely arranged between the flow channels, and its height is slightly higher than the height of the flow channel itself, but lower than the reserved buffer space distance. Such a design aims to effectively protect the flow channel plate during the bottom impact process and ensure the stability and safety of the cold plate 3 under extreme working conditions.

[0045] In one embodiment, the battery cell is a detachable battery pack, and the detachable battery pack is a battery pack subjected to foaming treatment.

[0046] In one embodiment, the detachable battery pack is provided with a battery pack sealing unit.

[0047] The main seal of the battery pack is a detachable design. Optionally, an on-line foaming design for the battery pack can be adopted, or an on-line installation of a sealing strip design can also be adopted.

[0048] Further, for the on-line foaming design, the sealing surface of the second Z-shaped crossbeam area 242 adopts a grooving design, and a foaming groove is reserved in the sealing area of the structure to realize on-line foaming to form a foaming rubber strip.

[0049] In one embodiment, the exhaust component includes a thermal runaway pressure relief exhaust channel, an exhaust hole, and a pressure relief unit;

[0050] The thermal runaway pressure relief exhaust channel and the exhaust hole are arranged on the first Z-shaped crossbeam area 241;

[0051] The pressure relief unit is arranged on the second Z-shaped crossbeam area 242.

[0052] In one embodiment, the pressure relief unit includes a pressure relief valve, and the pressure relief valve is connected to the thermal runaway pressure relief exhaust channel.

[0053] Specifically, the pressure relief valve in the second Z-shaped crossbeam area 242 communicates with the inner cavity of the structure, and is connected to the battery pack through the thermal runaway pressure relief exhaust channel in the first Z-shaped crossbeam area 241.

[0054] In one embodiment, the crossbeam 24 and the longitudinal beam 23 are made of aluminum alloy.

[0055] In one embodiment, the first Z-shaped crossbeam area 241 is configured with insulating pads or snap-in fixing blocks.

[0056] Specifically, the insulating pads or snap-in fixing blocks are configured to support the corresponding high- and low-voltage components.

[0057] As Figure 1 shown, in one embodiment, the structure includes a longitudinal beam 23, a crossbeam 24, an explosion-proof valve 22, a cover 21, and a sealing strip. The longitudinal beam 23 and the crossbeam 24 are connected by welding, and the end of the longitudinal beam 23 is adjacent to the end of the crossbeam 24 and welded to form a weld 26.

[0058] The sealing strip is composed of an on-line foaming sealant strip 25 and a sealing and anti-corrosion glue

[0059] The longitudinal beam 23 is made of extruded aluminum alloy profile, and a gap of 7-9 mm is left between the longitudinal beam 23 and the battery cell. In the inner cavity of the longitudinal beam 23, a corresponding solid area is reserved, thread tapping is set in the solid area, and a groove running along the S direction is designed.

[0060] The crossbeam 24 is made of extruded aluminum alloy profile, which is wrapped around the periphery of the battery cell and clamps the battery cell. The crossbeam 24 forms a stepped Z-shaped structural design. Among them, the first Z-shaped crossbeam area 241 is close to the battery cell area, and the height is not lower than the height of the pole coil inside the battery cell. The main function is to apply a certain clamping force to the battery cell to achieve anti-expansion, support and limiting effects throughout the life cycle of the battery cell. The second Z-shaped crossbeam area 242 is close to the outside, and the height is consistent with the longitudinal beam 23.

[0061] like Figure 3 As shown, a beam cavity 243 is formed inside the beam 24, and a vent hole 245 is provided in the first Z-shaped beam area 241 of the beam cavity 243, which is connected to the inner space of the battery pack. The beam cavity 243 is provided with two explosion-proof valve mounting holes 244 on the vertical surface of the second Z-shaped beam area 242, and the explosion-proof valve 22 is screwed into the explosion-proof valve mounting hole 244, and the explosion-proof valve 22 is sealed by the O-ring provided by the explosion-proof valve 22. A cover 21 is fixed to the outside of the explosion-proof valve 22, and the cover 21 is screwed to the frame beam 24 by bolts, thereby directing the high-temperature smoke during the thermal runaway process to the ground, reducing the damage of the thermal runaway to the surrounding components in the vehicle.

[0062] The cold water plate 3 is connected to the framework by friction stir welding. The front surface of the inner surface of the cold water plate 3 is sprayed with insulating paint, and the outer surface of the cold water plate flow channel plate includes a friction stir welding weld area 37, which is sprayed with anti-corrosion paint.

[0063] like Figure 2 As shown, a U-shaped flow channel is formed inside the cold water plate 3, and a water outlet 31 and a water inlet 32 ​​extend from one end of the flow channel plate of the cold water plate 3. The water outlet 31 and the water inlet 32 ​​are made of aluminum sleeves and fixed to the flow channel plate by welding. The overall thickness of the cold water plate 3 is between 6-9mm, and the internal flow channel stamping depth is 3-4mm. The cold water plate 3 can withstand a certain weight of the battery cell and can be used as an auxiliary fixing device for the battery cell, thereby enhancing the structural strength of the battery pack. The cold water plate 3 is connected to the external water pipe joint 34. The water pipe joint adopts an injection molding process and is sealed with the water inlet and outlet of the cold water plate through a radial seal.

[0064] The cold water plate 3 flow channel plate is bonded with a "J"-shaped buffer component 35 on the outside. It is fixed between the flow channels by gluing, and the height of the buffer component should be slightly higher than the flow channel height and lower than the buffer space distance.

[0065] The bottom plate includes a bottom cover plate 11, a "ji"-shaped reinforcing beam 12, a flat guard plate 14, and a thermal insulation foam 13. The "ji"-shaped reinforcing beam 12 is located inside the bottom cover plate 11 and is joined together by welding. The bottom cover plate 11 is fixed to the flat guard plate 14 by bolts. The bottom cover plate 11 is used for the bottom protection and buffer area. When the vehicle bottom is subjected to a certain impact, the bottom cover plate 11 serves as the first line of defense, protecting the upper cold plate 3 and the battery cells, ensuring safety and reliability during mechanical collisions. The flat guard plate 14 of the bottom plate is made of an aluminum alloy plate with a thickness of 5 - 8 mm and serves as the second line of defense for bottom protection and buffering. The gap between the cold plate 3 and the flat guard plate 14 is the third line of defense for bottom protection and buffering, and the "ji"-shaped cross-section buffer member 36 outside the cold plate 3 can effectively absorb energy. The thermal insulation foam 13 can effectively reduce the influence of the external environment on the battery pack and further achieve heat insulation of the battery pack.

[0066] The utility model has the following beneficial effects:

[0067] 1. Strong protection: The cold plate is provided with a buffer "ji"-shaped buffer member for protection when being struck from the bottom, which can effectively deform and absorb energy, protect the flow channel, protect the cold plate and the battery cells, and ensure safety and reliability during mechanical collisions.

[0068] 2. High integration: The cold plate and its structure show extremely high integration, integrating the structural support and the thermal management function, saving the fixing bracket, increasing the space utilization rate, and further reducing the required space and significantly improving the space efficiency of the overall system by integrating functions such as structural support, battery cell thermal runaway exhaust, and pressure relief valve fixing.

[0069] In the description of the present application, it should be noted that the terms used here are only for describing the specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. For the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0070] It should be noted that in this application, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. It should also be pointed out that the scope of the methods and devices in the embodiments of this application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0071] In addition, it should be noted that unless otherwise clearly specified and defined, the terms "connected", "driven" and similar words used in the description of this application should be understood in a broad sense, which can be direct, or through an intermediate medium, or can also be the relationship inside two elements. Those skilled in the art can understand their specific meanings in this application according to specific circumstances. In this article, similar words such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0072] The above embodiments are provided for those skilled in the art to implement or use this application. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the application idea of this application. Therefore, the protection scope of this application is not limited by the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.

Claims

1. A CTP battery pack, characterized in that: The CTP battery pack includes: Battery cells; A cold water plate, wherein the cold water plate is provided with a "X"-shaped buffer component, and the battery cell is connected to the cold water plate; A bottom supporting mechanism, the bottom supporting mechanism includes a framework and a bottom plate, the framework is connected to the bottom plate, the framework includes a crossbeam and a longitudinal beam, the crossbeam is provided with an exhaust component, the crossbeam includes a first Z-shaped crossbeam area and a second Z-shaped crossbeam area, and the battery cell is connected to the exhaust component.

2. The CTP battery pack according to claim 1, characterized in that: The cross beam and the longitudinal beam are placed on the outside of the battery cell; The first Z-shaped crossbeam area is close to the battery cell, and the height of the first Z-shaped crossbeam area is not lower than the height of the battery cell; The second Z-shaped cross beam area is a sealing surface, and the height of the second Z-shaped cross beam area is consistent with that of the longitudinal beam.

3. The CTP battery pack according to claim 2, characterized in that: The cross beam is clamped to the battery cell, and an energy absorbing gap is provided between the longitudinal beam and the battery cell.

4. The CTP battery pack according to claim 1, characterized in that: The cold water plate includes a flow channel, a flow channel plate, a cover plate and a guard plate. A cavity is provided between the cover plate and the guard plate. The "X"-shaped buffer component is placed on the flow channel plate and between the cover plate and the guard plate. The "X"-shaped buffer component is higher than the flow channel.

5. The CTP battery pack according to claim 1, characterized in that: The battery cell is a detachable battery pack, and the detachable battery pack is a foaming-treated battery pack.

6. The CTP battery pack according to claim 5, characterized in that: The detachable battery pack is provided with a battery pack sealing unit.

7. The CTP battery pack according to claim 1, characterized in that: The exhaust component includes a thermal runaway pressure relief exhaust channel, an exhaust hole and a pressure relief unit; The thermal runaway pressure relief exhaust channel and the exhaust hole are arranged on the first Z-shaped crossbeam area; The pressure relief unit is arranged on the second Z-shaped crossbeam area.

8. The CTP battery pack according to claim 7, characterized in that: The pressure relief unit includes a pressure relief valve, and the pressure relief valve is connected to the thermal runaway pressure relief exhaust passage.

9. The CTP battery pack according to claim 1, characterized in that: The cross beam and the longitudinal beam are made of aluminum alloy.

10. The CTP battery pack according to claim 1, characterized in that: The first Z-shaped crossbeam area is provided with an insulating pad or a clamping fixing block.

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