Pressing strip structure and battery pack

Abstract

The utility model relates to a depression bar structure and a battery pack, the depression bar structure comprises a depression bar and also comprises an assembly part arranged at the bottom of the depression bar, and a plurality of heat management cavities extending along the direction of the assembly part are arranged in the assembly part in a penetrating manner. The batten structure provided by the utility model is provided with the heat management cavity, and heat management devices such as a liquid cooling pipeline, a direct cooling pipeline or a heating sheet can be assembled in the heat management cavity to cool or heat the battery, so that the battery can work in a proper temperature interval under the condition of high temperature or low temperature, the internal space of a battery pack is fully utilized, and the battery pack is more convenient to use. The problem that the Z-direction space is limited is solved.

Description

Technical Field

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

[0002] With the development of new energy vehicle technology, the battery system, as the heart of new energy vehicles, has higher and higher requirements in terms of safety and endurance performance. When integrating battery cells in traditional battery systems, most of them are packaged into battery modules through peripheral structural parts, and then integrated into the battery box as a unit. Therefore, the traditional battery pack design has a complex structure, requires a large number of parts, and has a low system integration. As the market has higher and higher requirements for battery pack energy density, power and safety, the traditional battery pack integration method can no longer meet market demand.

[0003] At present, the battery grouping adopts the CTP (cell to battery pack) method, and most of them fix the battery cells by applying a large amount of structural glue on the bottom of the battery cell. However, this method has poor maintainability, and the consistency of glue fixation is difficult to control. There is a risk of cracking after long-term use, and it will also have an adverse effect on the subsequent recycling process of the battery. In response to this problem, the patent with publication number CN207338477U provides a battery pack, which is provided with a pressure strip, the pressure strip has a positioning hole, and the lower box of the battery pack is provided with a connecting hole. The pressure strip is connected to the lower box by bolts to realize the function of fixing the battery module. However, the battery pack only considers the constraints of the freedom of the battery height direction. Most of the liquid cooling system of the battery pack is arranged at the bottom or top of the battery, occupying a certain space in the PACK height direction, and the internal space utilization of the battery pack is not fully utilized. Utility Model Content

[0004] Based on this, in view of the technical problem that the current battery pack only considers the constraints of the freedom in the direction of battery height and does not fully utilize the internal space utilization of the battery pack, it is necessary for the utility model to provide a pressure strip structure and a battery pack.

[0005] The utility model provides a pressure strip structure, which comprises a pressure strip and an assembly part arranged at the bottom of the pressure strip. The assembly part is penetrated by a plurality of heat management cavities extending along the direction thereof.

[0006] The pressure strip structure provided by the utility model is provided with a thermal management cavity, and thermal management devices such as liquid cooling pipes, direct cooling pipes or heating plates can be installed in the thermal management cavity to cool or heat the battery, so that the battery can be operated in a suitable temperature range under high or low temperature conditions, making full use of the internal space of the battery pack and solving the problem of tight space in the Z direction.

[0007] As a further improvement of the above solution of the utility model, a plurality of connecting edges are formed on one side of the bottom of the assembly part, and a mounting hole 1 is vertically penetrated through the connecting edge, and horizontally arranged mounting holes 2 are formed at both ends of the pressure strip and / or the assembly part in the length direction.

[0008] As a further improvement of the above solution of the utility model, the pressure strip is provided with installation holes 1 extending from its top surface to the bottom surface of the assembly part at intervals along its length direction, and the pressure strip and / or the assembly part are provided with horizontally arranged installation holes 2 at both ends in the length direction.

[0009] As a further improvement of the above solution of the utility model, a plurality of weight-reducing cavities extending along the length direction of the pressure strip and penetrating the pressure strip are provided in the pressure strip and / or the assembly portion.

[0010] As a further improvement of the above solution of the utility model, a pressing edge extending along the length direction of the pressing strip is formed on at least one side of the top of the pressing strip.

[0011] As a further improvement of the above solution of the utility model, a heat insulation pad is arranged at the bottom of the assembly part, an insulation layer is formed on at least one side surface in the length direction of the assembly part, and the top of the insulation layer extends to the top surface of the pressing edge.

[0012] As a further improvement of the above solution of the utility model, the height of the pressure strip structure is H, the width of the assembly part is W, and H is 2-5 times of W.

[0013] As a further improvement of the above scheme of the utility model, the pressure strip structure is integrally injection molded by non-metallic materials; or, is extruded, cast, bent or stamped and welded by metal materials; or, is pultruded or thermoset by composite materials.

[0014] The utility model provides a battery pack, which includes the pressure strip structure as mentioned above.

[0015] As a further improvement of the above scheme of the utility model, the battery pack includes a lower box body, a plurality of battery modules arranged side by side in the lower box body, and two end plates. The pressure strip structure is provided between any two adjacent battery modules and on the outside of the two outermost battery modules of the battery pack. The length direction of the pressure strip structure is consistent with the length direction of the battery module and it is detachably connected to the lower box body through a connecting piece; the two end plates are respectively arranged at the two ends of the battery module and the two ends of the length direction of the pressure strip structure are respectively detachably connected to the two end plates.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The pressure strip structure provided by the utility model is provided with a heat management cavity, and a heat management device such as a liquid cooling pipe, a direct cooling pipe or a heating plate can be installed in the heat management cavity to cool or heat the battery, so that the battery can work in a suitable temperature range under high or low temperature conditions, making full use of the internal space of the battery pack and solving the problem of tight space in the Z direction.

[0018] 2. The pressure strip structure provided by the utility model has various forms and good compatibility. It can be T-shaped or Z-shaped, with high integration. It can be arranged between battery modules or on one side of the battery module to limit the battery's X, Y, and Z degrees of freedom. The structure is streamlined and the overall structural strength of the battery pack is higher. At the same time, it has good assembly and maintainability, and the detachable assembly method avoids the problems of difficult maintenance and high maintenance costs of the current CTP battery pack structure, greatly reducing production and later maintenance costs.

[0019] 3. Currently, batteries are grouped in a CTP (cell to pack) manner, and most of them fix the battery cells by applying a large amount of structural glue on the bottom of the battery cells. However, this method has poor maintainability and the glue has the risk of cracking under extreme working conditions during long-term use. The use of the pressure strip of the utility model to fix the battery can effectively improve the fixing strength and reliability of the battery and facilitate disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a first layering strip structure proposed in an embodiment of the utility model;

[0021] Figure 2 for Figure 1 A top view of

[0022] Figure 3 for Figure 1 sectional view of

[0023] Figure 4 A schematic diagram of a second layering strip structure proposed in an embodiment of the utility model;

[0024] Figure 5 for Figure 4 sectional view of

[0025] Figure 6 A schematic diagram of a third layering strip structure proposed in an embodiment of the utility model;

[0026] Figure 7 for Figure 6 sectional view of

[0027] Figure 8 A schematic diagram of the structure of a battery pack proposed in an embodiment of the utility model;

[0028] Fig. 9 for Figure 8 A cross-sectional view of

[0029] Fig.10 for Fig. 9 The enlarged schematic diagram of point B in the middle;

[0030] Fig.11 for Fig. 9 Enlarged diagram of point C in the middle

[0031] Fig.12 for Fig. 9 Enlarged schematic diagram at point D in the middle.

[0032] Figure numerals: 1. pressure strip; 11. pressure edge; 2. assembly part; 21. thermal management cavity; 22. weight reduction cavity; 23. thermal insulation pad; 24. insulation layer; 25. mounting hole one; 26. mounting hole two; 27. connection edge; 3. lower box; 4. battery module; 5. connector; 6. end plate. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] This embodiment designs three structures of pressure strips according to the different distances between different battery modules in the battery pack.

[0035] Reference Figure 1-Figure 3 , the first beading structure of this embodiment has a T-shaped transverse cross-section. The first beading structure includes a beading 1 and an assembly part 2 arranged at the bottom of the beading 1. Both sides of the top of the beading 1 are formed with pressure edges 11, which are used to limit the battery in the height direction of the battery. Several weight-reducing cavities 22 for weight reduction are opened in the beading 1 along its length direction. The length direction of the assembly part 2 is consistent with the length direction of the beading 1. A plurality of through cavities are opened in the assembly part 2 along its length direction, a part of which is used to assemble the thermal management cavity 21 of the thermal management structure, and the remaining through cavities are used as weight-reducing cavities 22. Horizontally arranged mounting holes 26 are opened at both ends of the length direction of the assembly part 2. Insulating layers 24 are provided on both sides of the length direction of the assembly part 2, and the tops of the two insulating layers 24 extend to the top surfaces of the two pressure edges 11 respectively. A thermal insulation pad 23 is also provided at the bottom of the assembly part 2. The first beading structure is also provided with a plurality of mounting holes 25 spaced apart along the length direction of the beading 1, and the mounting holes 25 extend vertically and pass through the bottom surface of the assembly part 2.

[0036] Reference Figure 4 , Figure 5, the second pressure strip structure of this embodiment also has a T-shaped transverse cross-section. The second pressure strip structure includes a pressure strip 1 and an assembly part 2 arranged at the bottom of the pressure strip 1. Pressure edges 11 are formed on both sides of the top of the pressure strip 1, which are used to limit the battery in the height direction of the battery. Horizontally arranged mounting holes 26 are provided at both ends of the length direction of the pressure strip 1. Several weight reduction cavities 22 for weight reduction are provided in the pressure strip 1 along its length direction. The length direction of the assembly part 2 is consistent with the length direction of the pressure strip 1. A plurality of through cavities are provided in the assembly part 2 along its length direction, some of which are used to assemble the thermal management cavity 21 of the thermal management structure, and the remaining through cavities are used as weight reduction cavities 22. Insulating layers 24 are provided on both sides of the length direction of the assembly part 2, and the tops of the two insulating layers 24 extend to the sides of the two pressure edges 11 respectively. The widths of the pressure strip 1 and the assembly part 2 of the second pressure strip structure are respectively smaller than the widths of the pressure strip 1 and the assembly part 2 of the first pressure strip structure.

[0037] Reference Figure 6 , Figure 7 , the third pressure strip structure of this embodiment also has a Z-shaped transverse cross-section. The third pressure strip structure includes a pressure strip 1 and an assembly part 2 arranged at the bottom of the pressure strip 1. A pressure edge 11 is formed on one side of the top of the pressure strip 1, which is used to limit the battery in the height direction of the battery. Horizontally arranged mounting holes 26 are provided at both ends of the length direction of the pressure strip 1. Several weight reduction cavities 22 for weight reduction are provided in the pressure edge 11 along its length direction. The length direction of the assembly part 2 is consistent with the length direction of the pressure strip 1. A plurality of through cavities are provided in the assembly part 2 along its length direction, some of which are used to assemble the thermal management cavity 21 of the thermal management structure, and the remaining through cavities are used as weight reduction cavities 22. An insulating layer 24 is provided on one side of the assembly part 2 close to the pressure edge 11, and the top of the insulating layer 24 extends to the top surface of the pressure edge 11. A plurality of spaced connecting edges 27 are formed on the side of the bottom of the assembly part 2 away from the pressure edge 11, and a mounting hole 25 is provided vertically through the connecting edge 27. The widths of the beading strip 1 and the assembly portion 2 of the third beading strip structure are respectively smaller than the widths of the beading strip 1 and the assembly portion 2 of the second beading strip structure.

[0038] In this embodiment, the thermal management cavity 21 of the first layer strip structure, the second layer strip structure, and the third layer strip structure is used to place a thermal management device. The thermal management structure can be a liquid cooling pipe or a direct cooling pipe, and a PTV heating plate can also be installed in the thermal management cavity 21 to cool or heat the battery so that the battery can operate in a suitable temperature range under high or low temperature conditions.

[0039] In this embodiment, the overall height of the first bead structure, the second bead structure, and the third bead structure is H, the width of the assembly portion 2 is W, and H is 2-5 times of W. The first bead structure, the second bead structure, and the third bead structure can be made of non-metallic materials (such as PP, PC, ABS, PA66, etc.) through injection molding; they can also be made of metal materials (such as aluminum alloy AL5083, AL6061, steel, etc.) through extrusion molding, casting, bending, stamping and welding; they can also be pultruded or thermoset by composite materials, and the composite material can be a composite material of long glass fiber / carbon fiber and resin, and the resin can be existing epoxy resin, polyurethane resin, phenolic resin, vinyl resin, etc.

[0040] Reference Figure 8-Figure 9 This embodiment also proposes a battery pack, which includes a lower box 3, a plurality of battery modules 4, two end plates 6, and the above-mentioned first layer strip structure, second layer strip structure, and third layer strip structure.

[0041] A plurality of battery modules 4 are arranged in the lower box body 3 at intervals along the width direction of the lower box body 3 , and each battery module 4 includes a plurality of batteries stacked at intervals along the length direction of the lower box body 3 .

[0042] A first pressure strip structure is provided between two adjacent battery modules 4 with a large distance between them. Fig.10 The two pressing edges 11 of the first beading structure are respectively pressed against the shoulders of the batteries of the two adjacent battery modules 4 to limit the Z-direction freedom of the battery and prevent the battery from moving. The lower box 3 is provided with assembly holes at positions corresponding to the multiple mounting holes 25 of the first beading structure. The first beading structure is connected to the lower box 3 through a connector 5 (such as a bolt). By installing a liquid cooling pipe or a direct cooling pipe in the thermal management cavity 21 of the first beading structure, a PTV heating plate can also be installed in the thermal management cavity 21 to cool or heat the battery so that the battery can be operated in a suitable temperature range under high or low temperature conditions. The insulating layer 24 of the first beading structure fits with the battery to prevent the battery shell from being worn during the installation process, resulting in electrical risks such as short circuit and arcing. The thermal management device provided in the first beading structure can exchange heat with the battery through its large surfaces on both sides. The thermal insulation pad 23 at the bottom of the first layer structure contacts the bottom of the lower box 3, and the thermal management device in the isolation layer 1 transfers heat to the lower box 3, so that more of the generated energy is used for battery heat transfer, which is beneficial to improve thermal management efficiency and reduce energy consumption.

[0043] A second pressure strip structure is provided between two adjacent battery modules 4 with a smaller distance. Fig.11The two pressing edges 11 of the second beading structure are respectively pressed against the shoulders of the batteries of two adjacent battery modules 4 to limit the Z-direction freedom of the battery and prevent the battery from moving. By installing a liquid cooling pipe or a direct cooling pipe in the thermal management cavity 21 of the second beading structure, a PTV heating plate can also be installed in the thermal management cavity 21 to cool or heat the battery so that the battery can operate in a suitable temperature range under high or low temperature conditions. The insulating layer 24 of the second beading structure fits with the battery to prevent the battery casing from being worn during the installation process, resulting in electrical risks such as short circuit and arcing. The thermal management device provided in the second beading structure can exchange heat with the battery through its large surfaces on both sides.

[0044] The outer sides of the two battery modules 4 at the outermost sides of the battery pack are each provided with a third layer structure. Fig.12 The pressing edge 11 of the third beading structure is pressed against the shoulders of multiple batteries on the outermost side of the battery pack to limit the Z-direction freedom of the battery and prevent the battery from moving. Assembly holes are provided on the lower box 3 at positions corresponding to the multiple connecting edges 27 of the third beading structure, and the connecting edges 27 are connected to the lower box 3 through connectors 5 (such as bolts). By installing a liquid cooling pipe or a direct cooling pipe in the thermal management cavity 21 of the third beading structure, a PTV heating plate can also be installed in the thermal management cavity 21 to cool or heat the battery so that the battery can operate in a suitable temperature range under high or low temperature conditions. The insulating layer 24 of the third beading structure fits with the battery to prevent the battery casing from being worn during the installation process, resulting in electrical risks such as short circuit and arcing. The thermal management device provided in the third beading structure can exchange heat with the battery through a large surface on one side of the third beading structure. The heat insulation pad 23 at the bottom of the third bead structure contacts the bottom of the lower box 3, and the heat management device in the isolation bead 1 transfers heat to the lower box 3, and more of the generated energy is used for battery heat transfer, which is beneficial to improve the thermal management efficiency and reduce energy consumption. Through the two third bead structures, the freedom of multiple battery modules 4 in the width direction of the lower box 3 is limited.

[0045] In this embodiment, two end plates 6 are respectively arranged at the two ends of the battery module 4, and the first pressure strip structure, the second pressure strip structure, and the third pressure strip structure are respectively connected to the two end plates 6 through the mounting holes 26 at both ends of the length direction thereof, thereby limiting the freedom of multiple battery modules 4 in the length direction of the lower box body 3.

[0046] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0047] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A layering structure, comprising a layering strip (1), characterized in that: It also includes an assembly portion (2) arranged at the bottom of the pressure strip (1), wherein the assembly portion (2) is provided with a plurality of heat management cavities (21) extending along the direction thereof; the pressure strip (1) and / or the assembly portion (2) are provided with a plurality of weight reduction cavities (22) extending along the length thereof, and at least one side of the top of the pressure strip (1) is formed with a pressing edge (11) extending along the length of the pressure strip (1); A plurality of connecting edges (27) are formed on one side of the bottom of the assembly portion (2), and a first mounting hole (25) is vertically penetrated on the connecting edge (27), and two mounting holes (26) arranged horizontally are formed at both ends of the pressure strip (1) and / or the assembly portion (2) in the length direction; or, the pressure strip (1) is provided with first mounting holes (25) vertically penetrated from its top surface to the bottom surface of the assembly portion (2) at intervals along its length direction, and two mounting holes (26) arranged horizontally are formed at both ends of the pressure strip (1) and / or the assembly portion (2) in the length direction.

2. The layering structure according to claim 1, characterized in that: A heat insulating pad (23) is provided at the bottom of the assembly portion (2), an insulating layer (24) is formed on at least one side surface in the length direction of the assembly portion (2), and the top of the insulating layer (24) extends to the top surface of the pressing edge (11).

3. The layering structure according to claim 1, characterized in that: The height of the layering structure is H, the width of the assembly portion (2) is W, and H is 2-5 times of W.

4. The layering structure according to claim 1, characterized in that: The pressure strip structure is integrally injection molded by non-metallic materials; or, is extruded, cast, bent or stamped by welding metal materials; or, is pultruded or thermoset by composite materials.

5. A battery pack, characterized in that: It comprises the layering structure according to any one of claims 1 to 4.

6. The battery pack according to claim 5, characterized in that: The battery pack comprises a lower box (3), a plurality of battery modules (4) arranged side by side in the lower box (3), and two end plates (6); the layering structure is arranged between any two adjacent battery modules (4) and outside the two battery modules (4) at the outermost sides of the battery pack; the length direction of the layering structure is consistent with the length direction of the battery module (4) and is detachably connected to the lower box (3) via a connecting piece (5); the two end plates (6) are respectively arranged at two ends of the battery module (4) and the two ends of the length direction of the layering structure are respectively detachably connected to the two end plates (6).

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