Battery pack

Abstract

The utility model discloses a battery pack, and belongs to the technical field of battery packs. Comprising a cell assembly and a cooling assembly, the cooling assembly comprises a cooling plate and a cooling pipeline, the cooling plate is in heat conduction connection with the battery cell assembly, the cooling plate is provided with a cooling flow channel, the cooling pipeline comprises a liquid cooling pipe and a reinforcing part, the liquid cooling pipe is communicated with the cooling flow channel and comprises at least one deformable section, and the reinforcing part is detachably connected to the periphery of the deformable section; the rigidity strength of the reinforcing piece is larger than that of the deformable section. In the embodiment of the invention, the arrangement of the deformable section can absorb the part tolerance and the assembly tolerance, so that the assembly difficulty can be reduced, and the beneficial effect of reducing the cost is achieved. In addition, the arrangement of the reinforcer can solve the problem that the liquid cooling pipe is not pressed in place to generate springback due to insufficient rigidity of the deformable section during cold pressing, and has the beneficial effects of improving the product yield and preventing the springback of the cooling pipe after crimping.

Description

Technical Field

[0001] The present application belongs to the technical field of battery packs, and specifically relates to a battery pack. Background Art

[0002] As the charging speed of battery packs increases, the cooling rate requirements for battery packs are higher. Battery packs usually use large-surface liquid cooling or side liquid cooling methods to dissipate heat.

[0003] Currently, liquid cooling plates require corresponding liquid cooling tubes for coolant input and output. Due to the limited distance between the two liquid cooling plates, the liquid cooling tubes are difficult to install and have difficulty accommodating dimensional and assembly tolerances, resulting in poor assembly reliability. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a battery pack that can solve the problem of poor assembly reliability of liquid cooling tubes in battery packs in the prior art.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a battery pack, comprising a battery cell assembly and a cooling assembly; the cooling assembly comprises a cooling plate and a cooling pipe, the cooling plate is thermally conductively connected to the battery cell assembly, the cooling plate has a cooling channel, the cooling pipe comprises a liquid cooling pipe and a reinforcement, the liquid cooling pipe is connected to the cooling channel of the cooling plate, the liquid cooling pipe comprises at least one deformable segment, the reinforcement is detachably connected to the periphery of the deformable segment, and the rigidity strength of the reinforcement is greater than the rigidity strength of the deformable segment.

[0007] In the embodiment of the present application, as the battery pack operates, the cell assembly generates heat, and the cooling assembly is configured to cool the cell assembly so that the cell assembly operates in a suitable temperature environment. It is understood that the cooling assembly includes multiple cooling plates, and the cooling pipe is configured to connect the multiple cooling plates so that the cooling medium circulates in the multiple cooling plates. Furthermore, the cooling pipe includes a liquid cooling pipe and a reinforcement, wherein the cooling medium circulates in the liquid cooling pipe and the cooling plate. During the battery pack assembly process, in order to increase assembly freedom and reduce costs, the liquid cooling pipe includes a deformable section. The provision of the deformable section gives the liquid cooling pipe a certain degree of flexibility. During the battery pack assembly process, the deformable section can allow the cooling pipe to deform within a certain range to achieve assembly, thereby absorbing assembly tolerances and improving assembly reliability. It is understandable that since the deformable section has a certain degree of deformation ability, the rigidity of the deformable section is low and it is difficult to withstand large forces. For example, when the liquid cooling pipe is crimped onto the cooling plate, the deformable section is difficult to bear the force to achieve crimping. The reinforcement member enhances the support strength of the deformable section. Specifically, the reinforcement member's rigidity is greater than that of the deformable section, and the reinforcement member is detachably attached to the outside of the deformable section. In practical applications, when a liquid cooling tube needs to be crimped onto a cooling plate, the reinforcement member attached to the outside of the deformable section protects the tube from deformation during the crimping process.

[0008] In the embodiments of the present application, the provision of a deformable segment can absorb component and assembly tolerances, thereby reducing assembly difficulty and improving assembly reliability, thereby reducing costs. Furthermore, the provision of a reinforcement member can address the issue of the liquid cooling tube not being pressed into place due to insufficient rigidity of the deformable segment during cold pressing, resulting in springback. This has the beneficial effect of improving product yield and preventing springback of the cooling tube after crimping.

[0009] Optionally, in an embodiment of the present application, the cooling plate includes a main body and a water nozzle connected to the main body, the main body has a cooling channel inside that is thermally conductively connected to the battery core assembly, the water nozzle is connected to the cooling channel, and the liquid cooling tube is crimped to the water nozzle to connect to the cooling channel.

[0010] Optionally, in an embodiment of the present application, the deformable section can be deformed along the axial direction of the liquid cooling tube and / or the radial direction of the liquid cooling tube, the reinforcement is a tubular structure and is sleeved on the outer circumference of the deformable section, and the maximum outer circumferential dimension of the deformable section is C mm; the reinforcement is provided with an opening, and the opening passes through the reinforcement along the axial direction of the reinforcement, and the outer circumferential dimension of the opening is 0.2.C mm-0.4C mm.

[0011] Optionally, in an embodiment of the present application, the outer peripheral dimension of the opening is 0.25C mm.

[0012] Optionally, in an embodiment of the present application, the outer wall of the deformable section abuts against the inner wall of the reinforcement, the maximum outer diameter of the deformable section is R1 mm, and the inner diameter of the reinforcement is R2 mm, wherein R1 mm>R2 mm.

[0013] Optionally, in an embodiment of the present application, the reinforcement is provided with a groove, the groove extends along the axial direction of the reinforcement, and the groove extends from the inner wall of the reinforcement along the radial direction of the reinforcement in a direction away from the center of the reinforcement.

[0014] Optionally, in an embodiment of the present application, the groove and the opening of the reinforcement are arranged opposite to each other along the radial direction of the reinforcement.

[0015] Optionally, in an embodiment of the present application, the liquid cooling tube further includes at least two reinforcing portions, at least two of the reinforcing portions are respectively connected to the two ends of the deformable section along the extension direction of the deformable section, and the reinforcing portions protrude from the deformable section along the radial direction of the liquid cooling tube in a direction away from the liquid cooling tube; the reinforcement is arranged between the two reinforcing portions along its own axial direction.

[0016] Optionally, in an embodiment of the present application, the liquid cooling tube further includes a main body and a reinforcement portion, and both ends of the deformable section along the axial direction of the liquid cooling tube are connected to the main body; the main body and the cooling plate are communicated, and the reinforcement portion is sleeved on the periphery of the main body, and the reinforcement portion is connected to the end of the main body close to the deformable section, and the reinforcement portion protrudes from the main body along the radial direction of the reinforcement in a direction away from the reinforcement; the reinforcement is arranged between the two reinforcement portions along its own axial direction.

[0017] Optionally, in an embodiment of the present application, the spacing between the two reinforcement parts along the axial direction of the liquid cooling tube is H1 mm, and the length of the reinforcement along the axial direction of the liquid cooling tube is H2 mm, wherein H1 mm ≥ H2 mm.

[0018] Optionally, in an embodiment of the present application, the maximum outer diameter of the reinforcement portion is R3 mm, and the inner diameter of the reinforcement is R2 mm, wherein R3 mm>R2 mm.

[0019] Optionally, in an embodiment of the present application, the deformable section is a bellows. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a battery pack in an embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the structure in which the cooling plate and the cooling pipe are separated from each other in an embodiment of the present application;

[0022] Figure 3 This is a schematic diagram of the structure in which the cooling plate and the cooling pipe are connected to each other in an embodiment of the present application;

[0023] Figure 4 This is a schematic diagram of a structure in which a liquid cooling tube and a reinforcement are separated from each other in an embodiment of the present application;

[0024] Figure 5 This is a schematic diagram of the structure of a liquid cooling tube and a reinforcement member connected to each other in an embodiment of the present application;

[0025] Figure 6 This is a schematic diagram of another structure in which the liquid cooling tube and the reinforcement are separated from each other in an embodiment of the present application;

[0026] Figure 7 This is a schematic diagram of another structure in which a liquid cooling tube and a reinforcement are connected to each other in an embodiment of the present application;

[0027] Figure 8 This is a schematic structural diagram of a reinforcement member in an embodiment of the present application;

[0028] Figure 9 It is a schematic diagram of the cross-sectional structure of the reinforcement member in the embodiment of the present application.

[0029] Description of reference numerals:

[0030] 10. Battery cell assembly; 20. Cooling assembly; 21. Cooling plate; 211. Main body; 212. Water nozzle; 22. Cooling pipe; 221. Liquid cooling pipe; 2211. Deformable section; 2212. Main body; 2213. Reinforcement; 222. Reinforcement; 2221. Bellows; 2222. Opening; 2223. Groove. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0033] The battery pack and electronic device provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0034] See also Figures 1 to 9 , an embodiment of the present application provides a battery pack, including a battery cell assembly 10 and a cooling assembly 20; the cooling assembly 20 includes a cooling plate 21 and a cooling pipe 22, the cooling plate 21 is thermally connected to the battery cell assembly 10, the cooling plate 21 has a cooling flow channel, the cooling pipe 22 includes a liquid cooling pipe 221 and a reinforcement 222, the liquid cooling pipe 221 is connected to the cooling flow channel of the cooling plate 21, the liquid cooling pipe 221 includes at least one deformable segment 2211, the reinforcement 222 is detachably connected to the periphery of the deformable segment 2211, and the rigidity strength of the reinforcement 222 is greater than the rigidity strength of the deformable segment 2211.

[0035] In an embodiment of the present application, as the battery pack works, the battery cell assembly 10 will generate heat, and the cooling assembly 20 is provided to cool the battery cell assembly 10 so that the battery cell assembly 10 can work in a suitable temperature environment. Specifically, the battery cell assembly 10 includes a plurality of battery cells, and the plurality of battery cells are arranged vertically and horizontally in the battery pack, which can improve the grouping efficiency of the battery cell assembly 10. The cooling plate 21 is provided between two adjacent battery cells, and the cooling plate 21 contacts the outer surface of the battery cell to take away the heat of the battery cell to cool the battery cell. It can be understood that the cooling assembly 20 includes a plurality of cooling plates 21, and the cooling pipe 22 is provided to connect the plurality of cooling plates 21 so that the cooling medium circulates in the plurality of cooling plates 21. Furthermore, the cooling pipe 22 includes a liquid cooling pipe 221 and a reinforcement 222, wherein the cooling medium circulates in the liquid cooling pipe 221 and the cooling plate 21. During the battery pack assembly process, in order to improve the assembly freedom and assembly reliability, as well as to reduce costs, the liquid cooling tube 221 includes a deformable section 2211. The setting of the deformable section 2211 makes the liquid cooling tube 221 have a certain flexibility. During the battery pack assembly process, the deformable section 2211 can make the cooling tube deform within a certain range to achieve assembly. It can be understood that since the deformable section 2211 has a certain deformation ability, the rigidity of the deformable section 2211 is relatively low and it is difficult to withstand large forces. For example, when the liquid cooling tube 221 is crimped onto the cooling plate 21, the deformable section 2211 is difficult to bear the force to achieve crimping. The setting of the reinforcement 222 is used to increase the supporting strength of the deformable section 2211. Specifically, the rigidity of the reinforcement 222 is greater than the rigidity of the deformable section 2211, and the reinforcement 222 is detachably connected to the outside of the deformable section 2211. In actual applications, when the liquid cooling tube 221 needs to be crimped to the cooling plate 21, the reinforcement 222 is connected to the outside of the deformable part. The setting of the reinforcement 222 can protect the liquid cooling tube 221 from deformation during the crimping process.

[0036] In the embodiment of the present application, the setting of the deformable section 2211 can absorb part tolerances and assembly tolerances. In addition, the setting of the reinforcement 222 can solve the problem that the liquid cooling tube 221 is not pressed into place due to insufficient rigidity during cold pressing, resulting in rebound. It has the beneficial effect of improving product yield and preventing the cooling tube from rebounding after crimping.

[0037] Furthermore, after the crimping is completed, in a position where the operating space is insufficient, the reinforcement 222 can be left on the deformable section 2211 or removed for reuse. The specific method can be determined according to the actual situation, and this embodiment does not impose any limitation on this.

[0038] Furthermore, the reinforcement 222 can be made of plastic by injection molding or extrusion, such as PA (polyamide), PC (polycarbonate), etc.; it can also be made of metal by casting or extrusion, such as aluminum, steel, etc.

[0039] Optionally, in an embodiment of the present application, the cooling plate 21 includes a main body 211 and a water nozzle 212 connected to the main body 211, the main body 211 has a cooling flow channel inside, the water nozzle 212 is connected to the cooling flow channel, and the liquid cooling pipe 221 is crimped to the water nozzle 212 to connect to the cooling flow channel.

[0040] In this embodiment of the present application, the body 211 contacts the battery cells and is configured to provide space for a cooling medium. The body 211 has a cooling channel within it, along which the cooling medium flows. In this embodiment of the present application, to improve assembly efficiency and reduce production costs, the liquid cooling tube 221 is connected to the nozzle 212 by crimping.

[0041] It should be noted that the water nozzle 212 includes a liquid inlet nozzle 212 and a liquid outlet nozzle 212 , and the cooling medium flows into the cooling flow channel from the liquid inlet nozzle 212 and flows out of the cooling flow channel from the liquid outlet nozzle 212 .

[0042] Optionally, in an embodiment of the present application, the deformable section 2211 can be deformed along the axial direction of the liquid cooling tube 221 and / or the radial direction of the liquid cooling tube 221, the reinforcement 222 is a tubular structure and is sleeved on the outer periphery of the deformable section 2211, and the maximum outer periphery size of the deformable section 2211 is C mm; the reinforcement 222 is provided with an opening 2222, and the opening 2222 passes through the reinforcement 222 along the axial direction of the reinforcement 222, and the outer periphery size of the opening 2222 is 0.2C mm-0.4C mm.

[0043] In an embodiment of the present application, in actual assembly, the deformable segment 2211 can be deformed along the axial direction of the liquid cooling tube 221, and the deformable segment 2211 can also be deformed along the radial direction of the liquid cooling tube 221. The liquid cooling tube 221 can be deformed along the axial direction of the cooling tube and the radial direction of the liquid cooling tube 221. During the assembly of the battery pack, the deformation of the above-mentioned deformable segment 2211 has the beneficial effect of improving the assembly freedom and reducing costs. The setting of the reinforcement 222 is used to increase the strength of the deformable segment 2211. When the liquid cooling tube 221 is crimped to the water nozzle 212, the reinforcement 222 is set on the periphery of the deformable member, which has the effect of preventing the liquid cooling tube 221 from being crimped into place and causing rebound. Specifically, the reinforcement member 222 has an opening 2222 extending axially therethrough. The opening 2222 is provided to facilitate assembly and separation between the reinforcement member 222 and the deformable segment 2211. Furthermore, to facilitate assembly and separation, and to ensure that the reinforcement member 222 improves the rigidity of the deformable segment 2211, the minimum circumferential dimension of the opening 2222 is approximately 0.2 times the maximum circumferential dimension C of the deformable segment 2211, and the maximum circumferential dimension of the opening 2222 is approximately 0.4 times the maximum circumferential dimension C of the deformable segment 2211.

[0044] Furthermore, in the embodiment of the present application, the outer peripheral dimension of the opening 2222 is 0.25C mm.

[0045] In the embodiment of the present application, preferably, the maximum outer circumference of the opening 2222 is 0.25 times the maximum outer circumference C of the deformation section.

[0046] Optionally, in the embodiment of the present application, the outer wall of the deformable section 2211 abuts against the inner wall of the reinforcement 222 , the maximum outer diameter of the deformable section 2211 is R1 mm, and the inner diameter of the reinforcement 222 is R2 mm, wherein R1 mm>R2 mm.

[0047] In the embodiment of the present application, the arrangement in which the outer wall of the deformable section 2211 abuts the inner wall of the reinforcement member 222 can effectively improve the rigidity of the deformable section 2211. Specifically, because the reinforcement member 222 has an opening 2222, the inner diameter of the reinforcement member 222 has room to expand when connected to the deformable portion. Furthermore, the arrangement in which the maximum outer diameter of the deformable section 2211 is greater than the inner diameter of the reinforcement member 222 allows the reinforcement member 222 to be tightly coupled to the deformable section 2211. This arrangement has the beneficial effect of achieving a compact connection between the reinforcement member 222 and the deformable portion.

[0048] Optionally, in an embodiment of the present application, the reinforcement 222 is provided with a groove 2223, which extends along the axial direction of the reinforcement 222, and the groove 2223 extends from the inner wall of the reinforcement 222 along the radial direction of the reinforcement 222 in a direction away from the center of the reinforcement 222.

[0049] In the embodiment of the present application, the provision of the groove 2223 can help to increase the size of the opening 2222. The groove 2223 is opened on the inner wall of the reinforcement 222, and the groove 2223 is recessed and extends along the radial direction of the reinforcement 222 in a direction away from the center of the reinforcement 222. The provision of the groove 2223 facilitates the assembly of the reinforcement 222 and the rebound after the assembly is completed, thereby realizing a compact connection between the reinforcement 222 and the deformable part.

[0050] Furthermore, the groove 2223 can weaken the radial rigidity of the reinforcement 222 without weakening the axial rigidity of the reinforcement 222, that is, it can make it easier to assemble the reinforcement 222 to the deformable portion without weakening the beneficial effect of providing axial rigidity to the deformable portion.

[0051] Optionally, in the embodiment of the present application, the groove 2223 and the opening 2222 of the reinforcement member 222 are arranged opposite to each other along the radial direction of the reinforcement member 222 .

[0052] In the embodiment of the present application, the relatively arranged groove 2223 and opening 2222 further increase the size of the opening 2222, facilitating the rebound of the reinforcement 222 after the assembly of the deformable portion, thereby achieving the beneficial effect of a compact connection between the reinforcement 222 and the deformable portion. In actual application, when the reinforcement 222 is snapped onto the deformable portion, the deformable portion enters the reinforcement 222 from the opening. At this time, the opening 2222 is squeezed open by the deformable portion, and the groove 2223 can also help increase the size of the opening 2222 until the deformable portion and the reinforcement 222 are fully assembled. After the assembly is completed, the reinforcement 222 and the deformable portion are connected. The provision of the groove 2223 can achieve the rebound of the reinforcement 222, so that the reinforcement 222 and the deformable portion are compactly connected.

[0053] Optionally, in an embodiment of the present application, the liquid cooling tube 221 further includes at least two reinforcing portions 2213, and the at least two reinforcing portions 2213 are respectively connected to the two ends of the deformable section 2211 along the extension direction of the deformable section 2211, and the reinforcing portions 2213 protrude from the deformable section 2211 in a direction away from the liquid cooling tube 221 along the radial direction of the liquid cooling tube 221; the reinforcement 222 is arranged between the two reinforcing portions 2213 along its own axial direction.

[0054] In the embodiment of the present application, the reinforcement portion 2213 is provided to limit the reinforcement member 222 so that when the liquid cooling tube 221 is pressed against the cold air plate, the liquid cooling tube 221 is pressed into place, thereby avoiding the rebound of the liquid cooling tube 221 due to the presence of the deformable portion. Specifically, the two reinforcement portions 2213 are respectively provided at both ends of the deformable portion along the extension direction of the liquid cooling tube 221, and the reinforcement portions 2213 protrude from the deformable portion. It can be understood that when the reinforcement member 222 and the deformable portion are connected, one end of the reinforcement member 222 presses against the reinforcement portion 2213 on the liquid cooling tube 221, and the other end presses against the other reinforcement portion 2213 on the liquid cooling tube 221. Most of the deformable portion is covered by the reinforcement member 222. When the liquid cooling tube 221 is crimped onto the water nozzle 212, the crimping force is transmitted to the reinforcing part 2213 through the reinforcement 222, ensuring that the crimping is in place and does not rebound. At the same time, the reinforcement 222 also improves the rigidity of the deformable part, which has the beneficial effect of preventing the crimping force from destroying the structure of the deformable part during crimping.

[0055] Optionally, in an embodiment of the present application, the liquid cooling tube 221 further includes a main body 2212 and a reinforcement portion 2213, and both ends of the deformable section 2211 along the axial direction of the liquid cooling tube 221 are connected to the main body 2212; the main body 2212 is connected to the cooling plate 21, and the reinforcement portion 2213 is sleeved on the periphery of the main body 2212, and the reinforcement portion 2213 is connected to the end of the main body 2212 close to the deformable section 2211, and the reinforcement portion 2213 protrudes from the main body 2212 along the radial direction of the reinforcement 222 in a direction away from the reinforcement 222; the reinforcement 222 is arranged between the two reinforcement portions 2213 along its own axial direction.

[0056] In the embodiment of the present application, the main body 2212 is provided to achieve communication with the cooling plate 21, thereby achieving a circulation flow of the cooling medium between the main body 2212 and the cooling plate 21. The reinforcement portion 2213 is provided to limit the reinforcement member 222, so that when the liquid cooling tube 221 is pressed into place on the cold air plate, the liquid cooling tube 221 is pressed into place, avoiding the rebound of the liquid cooling tube 221 due to the presence of the deformable portion. Specifically, the two reinforcement portions 2213 are sleeved on the outer periphery of the main body 211. Furthermore, the reinforcement portion 2213 and the main body 211 are fixedly connected, and the reinforcement portion 2213 protrudes from the deformable portion. It can be understood that when the reinforcement member 222 is connected to the deformable portion, one end of the reinforcement member 222 presses against the reinforcement portion 2213 on the liquid cooling tube 221, and the other end presses against another reinforcement portion 2213 on the liquid cooling tube 221. Most of the deformable portion is covered by the reinforcement member 222. When the liquid cooling tube 221 is crimped onto the water nozzle 212, the crimping force is transmitted to the reinforcing part 2213 through the reinforcement 222, ensuring that the crimping is in place and does not rebound. At the same time, the reinforcement 222 also improves the rigidity of the deformable part, which has the beneficial effect of preventing the crimping force from destroying the structure of the deformable part during crimping.

[0057] Optionally, in the embodiment of the present application, the spacing between the two reinforcement portions 2213 along the axial direction of the liquid cooling tube 221 is H1 mm, and the length of the reinforcement 222 along the axial direction of the liquid cooling tube 221 is H2 mm, where H1 mm ≥ H2 mm.

[0058] In the embodiment of the present application, the length of the reinforcement 222 is set to be smaller than the distance between the two reinforcement parts 2213 along the axial direction of the liquid cooling tube 221. The setting of the above-mentioned length relationship between H1 and H2 can enable the deformable part to be compressed and deformed, while also meeting the axial size tolerance and assembly tolerance of the deformable part.

[0059] Optionally, in the embodiment of the present application, the maximum outer diameter of the reinforcement portion 2213 is R3 mm, and the inner diameter of the reinforcement 222 is R2 mm, wherein R3 mm>R2 mm.

[0060] In the embodiment of the present application, since the maximum outer diameter of the reinforcement portion 2213 is greater than the inner diameter of the reinforcement 222, it can be understood that along the radial direction of the liquid cooling tube 221, the reinforcement 222 can abut against the reinforcement portion 2213 and cannot fall out, which has the effect of preventing the reinforcement 222 from falling out and affecting the rigidity strength of the deformable portion. At the same time, it also has the beneficial effect of preventing the liquid cooling tube 221 from rebounding due to insufficient rigidity when it is crimped.

[0061] Optionally, in an embodiment of the present application, the deformable section 2211 is a bellows 2221, which is arranged around the circumferential direction of the liquid cooling tube 221, and the reinforcement 222 is clamped to the bellows 2221. The bellows 2221 can be deformed along the axial direction of the liquid cooling tube 221 and / or the radial direction of the liquid cooling tube 221.

[0062] In the embodiment of the present application, the bellows 2221 has high flexibility and can absorb part tolerances and assembly tolerances. The configuration of the bellows 2221 can achieve deformation along the axial direction of the liquid cooling tube 221, and can also achieve deformation along the radial direction of the liquid cooling tube 221, as well as deformation along the axial direction of the liquid cooling tube 221 and along the radial direction of the liquid cooling tube 221. The configuration of the bellows 2221 can deform in the above three ways, which has the beneficial effect of improving the precision requirements of the parts used for assembly with the liquid cooling tube 221, reducing the difficulty of assembly and thus reducing costs. At the same time, the bellows 2221 has little rebound after crimping, which also has the beneficial effect of improving product yield.

[0063] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present 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 opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0064] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A battery pack, characterized in that: It comprises a battery core assembly (10) and a cooling assembly (20); The cooling assembly (20) comprises a cooling plate (21) and a cooling pipe (22); the cooling plate (21) is thermally connected to the battery core assembly (10); the cooling plate (21) has a cooling channel; the cooling pipe (22) comprises a liquid cooling pipe (221) and a reinforcement (222); the liquid cooling pipe (221) is connected to the cooling channel; the liquid cooling pipe (221) comprises at least one deformable segment (2211); the reinforcement (222) is detachably connected to the periphery of the deformable segment (2211); and the rigidity of the reinforcement (222) is greater than the rigidity of the deformable segment (2211).

2. The battery pack according to claim 1, wherein: The cooling plate (21) comprises a main body (211) and a water nozzle (212) connected to the main body (211); the main body (211) has a cooling channel inside that is thermally connected to the battery core assembly (10); the water nozzle (212) is connected to the cooling channel; and the liquid cooling pipe (221) is pressed onto the water nozzle (212) to connect to the cooling channel.

3. The battery pack according to claim 1, wherein: The deformable section (2211) can be deformed along the axial direction of the liquid cooling tube (221) and / or the radial direction of the liquid cooling tube (221); the reinforcement (222) is a tubular structure and is sleeved on the outer circumference of the deformable section (2211); the maximum outer circumference size of the deformable section (2211) is C mm; The reinforcement member (222) is provided with an opening (2222), and the opening (2222) penetrates the reinforcement member (222) along the axial direction of the reinforcement member (222), and the outer circumference size of the opening (2222) is 0.2C mm-0.4C mm.

4. The battery pack according to claim 3, wherein: The outer peripheral dimension of the opening (2222) is 0.25C mm.

5. The battery pack according to claim 3, wherein: The outer wall of the deformable section (2211) abuts against the inner wall of the reinforcement (222), the maximum outer diameter of the deformable section (2211) is R1 mm, and the inner diameter of the reinforcement (222) is R2 mm, wherein R1 mm>R2 mm.

6. The battery pack according to claim 1, wherein: The reinforcement (222) is provided with a groove (2223), the groove (2223) extending along the axial direction of the reinforcement (222), and the groove (2223) extends from the inner wall of the reinforcement (222) along the radial direction of the reinforcement (222) in a direction away from the center of the reinforcement (222).

7. The battery pack according to claim 6, characterized in that: The groove (2223) and the opening (2222) of the reinforcement member (222) are arranged opposite to each other along the radial direction of the reinforcement member (222).

8. The battery pack according to claim 1, wherein: The liquid cooling tube (221) further comprises at least two reinforcement portions (2213), wherein the at least two reinforcement portions (2213) are respectively connected to two ends of the deformable section (2211) along the extension direction of the deformable section (2211), and the reinforcement portions (2213) protrude from the deformable section (2211) in a radial direction of the liquid cooling tube (221) in a direction away from the liquid cooling tube (221); The reinforcement member (222) is arranged between the two reinforcement portions (2213) along its own axial direction.

9. The battery pack according to claim 1, wherein: The liquid cooling tube (221) further comprises a main body (2212) and a reinforcement portion (2213), and both ends of the deformable section (2211) along the axial direction of the liquid cooling tube (221) are connected to the main body (2212); The main body (2212) and the cooling plate (21) are in communication, the reinforcing portion (2213) is sleeved on the periphery of the main body (2212), the reinforcing portion (2213) is connected to the end of the main body (2212) close to the deformable section (2211), and the reinforcing portion (2213) protrudes from the main body (2212) in a radial direction of the reinforcing member (222) in a direction away from the reinforcing member (222); The reinforcement member (222) is arranged between the two reinforcement portions (2213) along its own axial direction.

10. The battery pack according to claim 8 or 9, characterized in that: The spacing between the two reinforcement parts (2213) along the axial direction of the liquid cooling tube (221) is H1 mm, and the length of the reinforcement member (222) along the axial direction of the liquid cooling tube (221) is H2 mm, wherein H1 mm ≥ H2 mm.

11. The battery pack according to claim 8 or 9, characterized in that: The maximum outer diameter of the reinforcement portion (2213) is R3 mm, and the inner diameter of the reinforcement member (222) is R2 mm, wherein R3 mm>R2 mm.

12. The battery pack according to claim 1, wherein: The deformable section (2211) is a bellows (2221).

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