A battery pack

Abstract

The application discloses a battery pack, and provides the battery pack, which contains a plurality of batteries in a box body, heat exchange plates are arranged between the batteries, adjacent heat exchange plates are communicated through heat exchange pipes, the heat exchange pipe comprises a connecting pipe and a heat exchange plate joint matched with each other, the connecting pipe comprises a flexible inner layer and an outer layer matched with each other, the inner layer is two and is fixedly connected to two ends of the outer layer respectively, and the flexible inner layer is in sealing cooperation with the heat exchange plate joint; the outer layer of the connecting pipe comprises an outer layer main body and a first flared opening arranged at two ends of the outer layer main body, the inner layer comprises an inner layer main body and a second flared opening arranged at one end of the inner layer main body, the thickness of the first flared opening is A1 mm, the thickness of the second flared opening is A2 mm, wherein A2 mm is greater than or equal to A1 mm, and (A2-A1) mm satisfies 0 mm≤(A2-A1) mm≤2 mm, so that the sealing performance of the connecting pipe and the heat exchange joint is ensured while the structural strength of the connecting pipe and the heat exchange joint is ensured.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery pack. Background Technology

[0002] In existing technologies, heat exchange plates are typically installed on the bottom and sides of the battery module to exchange heat and cool the battery module. Since there are multiple battery modules, in order to ensure the heat exchange effect, multiple side heat exchange plates need to be distributed sequentially between adjacent battery modules, and connecting pipes are needed to connect the side heat exchange plates sequentially so that the heat exchange medium can flow between the heat exchange plates through the connecting pipes; however, the current assembly process of connecting pipes and heat exchange plates is inefficient.

[0003] In summary, improving the assembly efficiency of connecting pipes and heat exchange plates is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery pack that improves the assembly efficiency of the connecting pipe and the heat exchange plate.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A battery pack includes: a housing with a receiving space, a plurality of batteries placed in the receiving space, heat exchange plates disposed between the batteries, and adjacent heat exchange plates connected by heat exchange pipes.

[0007] The heat exchange tube includes a connecting pipe and a heat exchange plate joint that cooperate with each other;

[0008] The connecting pipe includes a matching outer layer and an inner layer, with the inner layer nested inside the outer layer. There are two inner layers, which are respectively fixedly connected to both ends of the outer layer, and there is a gap between the two inner layers. The inner layer is a flexible layer and is used to seal with the heat exchange plate joint.

[0009] The outer layer includes an outer layer body and first flared openings disposed at both ends of the outer layer body; the inner layer includes an inner layer body and a second flared opening disposed at one end of the inner layer body; the end faces of the first flared opening and the end faces of the second flared opening are flush.

[0010] The thickness of the first flared opening is A1mm, and the thickness of the second flared opening is A2mm, where A2mm≥A1mm, and (A2-A1)mm satisfies: 0mm≤(A2-A1)mm≤2mm.

[0011] The battery pack provided in this application contains several batteries within the housing space. Heat exchange plates are positioned between the batteries, and adjacent heat exchange plates are connected by heat exchange tubes. Each heat exchange tube includes a mating connecting pipe and a heat exchange plate connector. The connecting pipe includes a matching outer layer and an inner layer, with the inner layer nested inside the outer layer. There are two inner layers, each fixedly connected to both ends of the outer layer, with a gap between them. The inner layer is flexible, and a sealed connection between the connecting pipe and the heat exchange plate connector is achieved through a sealing fit between the flexible inner layer and the heat exchange plate connector. The outer layer of the connecting pipe includes an outer body with first flared openings at both ends. The inner layer includes an inner body and a second flared opening at one end of the inner body. The end faces of the first and second flared openings are flush to improve the sealing effect with the heat exchange plate connector. The thickness of the first flared opening is A1m. The thickness of the second flared opening is A2mm, where A2mm ≥ A1mm, and (A2-A1)mm satisfies: 0mm ≤ (A2-A1)mm ≤ 2mm. If the difference is too large, the installation structure strength of the connecting pipe and the heat exchanger joint will be low, making the connecting pipe prone to deformation. If the difference is too small, the sealing performance of the connecting pipe and the heat exchanger joint will be poor. By setting the difference to 0mm ≤ (A2-A1)mm ≤ 2mm, the sealing performance of the connecting pipe and the heat exchanger joint is ensured while ensuring the installation structure strength. In this way, during the assembly process of the connecting pipe and the heat exchanger plate joint, the first and second flared openings are used for guidance, and the thickness of the second flared opening is greater than or equal to the thickness of the first flared opening, so that the second flared opening can provide a larger deformation range, thereby improving the convenience of the assembly process and improving the assembly efficiency of the connecting pipe and the heat exchanger plate. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the connecting pipe provided in an embodiment of this application;

[0014] Figure 2 This is a schematic diagram of the connecting pipe from another angle provided in an embodiment of this application;

[0015] Figure 3 A cross-sectional view of the connecting pipe provided in an embodiment of this application;

[0016] Figure 4 This is a schematic diagram of the structure of the heat exchange plate joint provided in the embodiments of this application;

[0017] Figure 5 A cross-sectional view of a heat exchanger plate joint provided in an embodiment of this application;

[0018] Figure 6 A cross-sectional view of the assembly of the connecting pipe and the heat exchange plate joint provided in an embodiment of this application;

[0019] Figure 7 This is a schematic diagram of a battery pack provided in an embodiment of this application.

[0020] Explanation of reference numerals in the attached figures:

[0021] 100-Connecting pipe, 110-Outer layer, 111-Reinforcing rib, 112-Reinforcing block, 113-Injection hole, 120-Inner layer;

[0022] 200 - Heat exchanger plate joint;

[0023] 300 - Heat exchange plate. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be a limitation of this application. As used in the specification and appended claims of this application, the singular expressions "a," "an," "the," "the," "the," and "this" are intended to also include expressions such as "one or more," unless the context clearly indicates otherwise. It should also be understood that in the embodiments of this application, "one or more" refers to one, two, or more; "and / or" describes the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0026] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0027] The "multiple" mentioned in the embodiments of this application refers to two or more. It should be noted that in the description of the embodiments of this application, terms such as "first" and "second" are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0028] like Figures 1-7 As shown in the embodiment of this application, the battery pack includes a housing with a receiving space containing a plurality of batteries. Heat exchange plates 300 are disposed between the batteries, and adjacent heat exchange plates 300 are connected by heat exchange pipes. Each heat exchange pipe includes a connecting pipe 100 and a heat exchange plate connector 200 that cooperate with each other. The connecting pipe 100 includes an outer layer 110 and an inner layer 120 that are adapted to each other. The inner layer 120 is nested inside the outer layer 110. There are two inner layers 120, and each inner layer 120 is fixedly connected to the outer layer 110. The two ends of layer 110 and the two inner layers 120 are spaced apart, so that during the injection molding process of inner layer 120, the injection length of inner layer 120 is reduced because the two inner layers 120 are injection molded separately. This reduces the generation of air bubbles in inner layer 120 during injection molding, improves the assembly and sealing effect of inner layer 120, and inner layer 120 is a flexible layer. The flexible inner layer 120 achieves a sealing fit with heat exchange plate joint 200, so as to achieve a sealed connection between connecting pipe 100 and heat exchange plate joint 200.

[0029] For example, the inner layer 120 can be a tube with a certain degree of flexibility, such as a rubber tube, a plastic tube, or a silicone tube; however, this embodiment does not limit this.

[0030] In this application, the outer layer 110 of the connecting pipe 100 includes an outer body and first flared openings at both ends of the outer body, and the inner layer 120 includes an inner body and a second flared opening at one end of the inner body. The end faces of the first and second flared openings are flush with each other, so that the end faces of the first and second flared openings can fit and seal with the mating end face of the heat exchange plate joint 200, thereby improving the sealing effect between the connecting pipe 100 and the heat exchange plate joint 200.

[0031] like Figure 3 As shown, the thickness of the first flared opening is A1mm, and the thickness of the second flared opening is A2mm, where A2mm≥A1mm, and (A2-A1)mm satisfies: 0mm≤(A2-A1)mm≤2mm; for example, (A2-A1)mm can be any one of 0mm, 1mm, 2mm, or any value between two of them; if the difference is too large, the installation structure strength of the connecting pipe and the heat exchange joint will be low, making the connecting pipe easy to deform; if the difference is too small, the sealing performance of the connecting pipe and the heat exchange joint will be poor. By setting the difference to 0mm≤(A2-A1)mm≤2mm, the sealing performance of the connecting pipe and the heat exchange joint is ensured while ensuring the installation structure strength.

[0032] In this way, during the assembly process of the connecting pipe 100 and the heat exchange plate joint 200, the first flared mouth and the second flared mouth are used for guidance, and the thickness of the second flared mouth is greater than that of the first flared mouth, so that the second flared mouth can provide a larger amount of deformation, thereby improving the convenience of the assembly process and improving the assembly efficiency of the connecting pipe and the heat exchange plate.

[0033] In this application, A1mm satisfies: 0.5mm≤A1mm≤1.5mm. For example, A1mm can be any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm or any value between two of them, to ensure that the first flared opening can provide a certain stiffness and strength.

[0034] In this application, A2mm satisfies: 1.5mm≤A2mm≤3mm. For example, A1mm can be any one of 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 29mm, 3.0mm or any value between two of them, to ensure that the second flared opening can have sufficient deformation to ensure a smooth assembly process.

[0035] It should be noted that the battery pack enclosure refers to a closed or semi-closed structure made of materials such as metal and plastic. It is the physical carrier of the battery pack, and its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack in different usage scenarios.

[0036] The enclosure provides installation space for the battery pack, battery management system (BMS), heat exchange system, electrical connection components, etc., and through reasonable structural design, it fixes these components in the enclosure to ensure that they maintain a relatively stable position during battery pack operation, and avoid damage to components or loosening of connections due to vibration, impact or other factors.

[0037] It should be noted that the partition beam is fixedly connected to the side wall of the enclosure. The partition beam divides the internal space of the enclosure into at least two sub-spaces: the battery compartment and the electrical compartment. The electrical compartment is used to house electrical components, which are electronic components used to electrically connect with individual battery cells to cooperate with the operation of the battery cells, including but not limited to battery management units, relays, fuses, etc. The battery compartment holds multiple batteries.

[0038] It should be noted that the heat exchange plate 300 can be used as a component to regulate the battery temperature.

[0039] (1) The heat exchange plate 300 is provided with a heat exchange channel inside. The heat exchange channel is used to circulate the heat exchange medium. The heat exchange medium can be gas (air), liquid (such as water, alcohol, refrigerant, oil, etc.) or solid (such as thermal conductive adhesive, thermal conductive solder paste, etc.). The heat exchange channel has an inlet and an outlet for the heat exchange medium. The heat exchange medium can enter the heat exchange channel through the inlet, and after heat exchange with the battery cell, it is discharged from the outlet to realize the heat exchange of the battery cell.

[0040] (2) The heat exchange plate 300 can exchange heat with the battery cell. The heat exchange plate 300 can be made of materials with high thermal conductivity such as copper; or, the heat exchange plate 300 is equipped with a heat pipe, which can quickly transfer heat through the principle of heat convection; or, the heat exchange plate 300 is equipped with a channel, which connects to the heating device or cooling device, and a liquid medium flows in the channel, through which efficient heat exchange can be carried out.

[0041] like Figure 3 As shown, the axial length of the second flared opening is 1mm-5mm. For example, the axial length of the second flared opening can be any one of 1mm, 2mm, 3mm, 4mm, and 5mm or any value between two of them, so that the second flared opening can provide a certain assembly dimension during the assembly process.

[0042] like Figure 3 As shown, the angle between the conical surface of the second flared opening and the inner wall of the inner body is α, and α satisfies: 45°≤α≤60°. For example, α can be any one of 45°, 50°, 55°, 60° or any value between two of them, so as to further ensure the connection strength between the connecting pipe 100 and the heat exchange plate joint 200 and improve the sealing effect.

[0043] like Figure 3 As shown, the thickness of the inner body is A3mm, and the thickness of the second flared opening is A2mm≥A3mm, and (A2-A3)mm satisfies: 0mm≤(A2-A3)mm≤2mm. For example, (A2-A3)mm can be any one of 0mm, 1mm, 2mm or any value between two of them. The thickness of the second flared opening is used to improve the uniformity of the sealing contact during assembly, making it easier to guide and compress during assembly, improving the smoothness of assembly, and further improving assembly efficiency.

[0044] In this application, A3mm satisfies: 1mm≤A3mm≤2mm. For example, A3mm can be a point value of either 1mm or 2mm, or a point value between the two. If A3mm is too large, it will affect the flow area of ​​the heat exchange medium. If A3mm is too small, it will make the deformation of the inner body too small. Therefore, 1mm≤A3mm≤2mm is made to ensure the flow area of ​​the heat exchange medium and at the same time ensure that the inner body has sufficient deformation to improve the sealing performance.

[0045] like Figure 3 As shown, the outer body includes a thinning section that nests with the inner body and a thickening section connecting the two thinning sections. The inner wall of the inner body is flush with the thickened inner wall to reduce the flow resistance of the heat exchange medium, improve the smoothness of the heat exchange medium flow, and improve the heat exchange efficiency.

[0046] like Figure 3 As shown, the thickness of the thinning section is A4mm, the thickness of the thickening section is A5mm, and (A5-A4)mm satisfies: 1mm≤(A5-A4)mm≤3mm. For example, (A5-A4)mm can be any one of 1mm, 2mm, and 3mm or any value between two of them, to ensure the overall strength of the outer layer 110 and to ensure that the inner body has a certain thickness and is sealed to the heat exchange plate joint 200 to ensure the normal flow of the heat exchange medium.

[0047] In this application, A4mm satisfies: 0.3mm≤A4mm≤1mm. For example, A4mm can be any one of 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm or any value between two of them, to ensure that the thinned section has sufficient support strength.

[0048] In this application, A5mm satisfies: 1.5mm≤A5mm≤4mm. For example, A4mm can be any one of 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 3mm, and 4mm, or any value between two of them, to ensure that the outer body has sufficient strength to support the flow of the heat exchange medium.

[0049] like Figures 4-5 As shown, one end of the heat exchanger plate joint 200 is a tapered section, which gradually tapers from the heat exchanger plate joint 200 towards the connecting pipe 100. The diameter of the larger end of the tapered section is D2mm. Figure 3 As shown, the inner diameter of the inner body is D1mm.

[0050] In this application, the diameter D2mm of the large end of the tapered section is greater than the inner diameter D1mm of the inner body, and (D2-D1)mm satisfies: 0.5mm≤(D2-D1)mm≤2mm. For example, (D2-D1)mm can be any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm, or any value between any two. In this way, after the connecting pipe 100 and the heat exchange plate joint 200 are assembled, the large end of the tapered section abuts against the inner body, and the large end of the tapered section can squeeze the inner body to deform, thereby improving the connection strength and sealing effect of the connecting pipe 100 and the heat exchange plate joint 200.

[0051] like Figure 3 As shown, since the inner layer 120 consists of two separate parts, a mating surface is formed between the end face of the inner layer body and the end face of the thickened section.

[0052] Because the inner layer 120 is a flexible layer, during the flow of the heat exchange medium from the conical section of the heat exchange plate joint 200, the heat exchange medium will impact the mating surface between the inner layer body and the thickened section. To reduce the impact on the mating surface, such as... Figure 6 As shown, the distance between the small end of the conical section and the mating surface is hmm, and hmm satisfies: 2mm≤hmm≤8mm. For example, hmm can be any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, and 8mm or any value between two of them, in order to reduce the impact of the heat exchange medium on the mating surface, extend the service life of the inner layer 120, and improve the sealing effect.

[0053] like Figures 1-3As shown, the outer wall of the outer layer 110 is provided with at least two reinforcing ribs 111, each of which has a ring structure, and the at least two reinforcing ribs 111 are distributed sequentially along the axial direction of the outer layer 110 to increase the strength of the outer layer 110 and improve the stability of the connecting pipe 100 during operation.

[0054] For example, such as Figures 1-3 As shown, the outer wall of the outer layer 110 is provided with 5 reinforcing ribs 111 to further improve the strength of the outer layer 110; of course, 3, 4, 6 or other reinforcing ribs 111 can also be provided, which can be selected according to the actual situation, and this application embodiment does not limit this.

[0055] In this application, in order to strengthen the connection between the connecting pipe 100 and the heat exchange plate joint 200, at least one reinforcing rib 111 is located at the corresponding position of the mating section between the inner layer 110 and the heat exchange plate joint 200, so as to enhance the connection strength between the connecting pipe 100 and the heat exchange plate joint 200 through the reinforcing rib 111, and ensure the stability of the heat exchange medium flow process.

[0056] like Figure 6 As shown, the length of the heat exchange plate joint 200 extending into the inner layer 120 is H1mm, and the distance between the reinforcing rib 111 and the end face of the second flared opening is H2mm, where H1mm > H2mm, and (H1-H2)mm satisfies: 1mm ≤ (H1-H2)mm ≤ 10mm. For example, (H1-H2)mm can be any one of 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm or any value between two of them, so that the reinforcing rib 111 can strengthen the connection strength between the connecting pipe 100 and the heat exchange plate joint 200.

[0057] In this application, H1mm satisfies: 8mm≤H1mm≤15mm. For example, H1mm can be any one of 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm or any value between two of them, to ensure the connection strength between the heat exchange plate joint 200 and the inner layer 120.

[0058] In this application, H2mm satisfies: 5mm≤H2mm≤10mm. For example, H2mm can be any one of 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm or any value between two of them, so that the reinforcing rib 111 can correspond to the thinning area of ​​the outer layer 110, thereby improving the connection strength of the outer layer 110.

[0059] like Figure 3As shown, the length of the outer layer 110 is H3mm, and the length of the inner layer 110 is H4mm, and H4 / H3 satisfies: 0.1≤H4 / H3≤0.3. For example, H4 / H3 can be any one of 0.1, 0.2, 0.3 or any value between two of them, so that the inner layer 110 can provide sufficient assembly dimensions with the heat exchange plate connector 200, and avoid the generation of air bubbles during the injection molding process of the inner layer 110, so as to ensure the overall strength of the outer layer 110 and the inner layer 120.

[0060] like Figure 2 As shown, a reinforcing block 112 is fixed to the outside of the first flared opening. The reinforcing block 112 strengthens the first flared opening, thereby enhancing the mating strength between the second flared opening and the mating end face of the heat exchange plate joint 200, and improving the connection strength and sealing effect.

[0061] like Figure 1 As shown, an injection hole 113 is also provided on the outer layer 110. The injection hole 113 is located on the conical surface of the first flared mouth. During the injection molding process to form the inner layer 120, the outer layer 110 and the mold together form the injection chamber of the inner layer 120, and the inner layer 120 is formed by injection molding through the injection hole 113 of the outer layer 110, so as to realize the nesting fit between the inner layer 120 and the outer layer 110.

[0062] The battery pack provided in this application embodiment is assembled with the heat exchange plate joint 200 through a connecting pipe 100 that cooperates with each other. The first and second flared ends of the connecting pipe 100 are guided and engaged with the tapered section of the heat exchange plate joint 200 to improve the convenience of the assembly process and improve the assembly efficiency of the connecting pipe 100 and the heat exchange plate joint 200.

[0063] The above description of the embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, characterized in that, include: The housing has a storage space containing several batteries. Heat exchange plates are arranged between the batteries, and adjacent heat exchange plates are connected by heat exchange pipes. The heat exchange tube includes a connecting pipe and a heat exchange plate joint that cooperate with each other; The connecting pipe includes a matching outer layer and an inner layer, with the inner layer nested inside the outer layer. There are two inner layers, which are respectively fixedly connected to both ends of the outer layer, and there is a gap between the two inner layers. The inner layer is a flexible layer and is used to seal with the heat exchange plate joint. The outer layer includes an outer layer body and first flared openings disposed at both ends of the outer layer body; the inner layer includes an inner layer body and a second flared opening disposed at one end of the inner layer body; the end faces of the first flared opening and the end faces of the second flared opening are flush. The thickness of the first flared opening is A1mm, and the thickness of the second flared opening is A2mm, where A2mm≥A1mm, and (A2-A1)mm satisfies: 0mm≤(A2-A1)mm≤2mm.

2. The battery pack according to claim 1, characterized in that, The axial length of the second flared opening is 1mm-5mm.

3. The battery pack according to claim 1, characterized in that, The angle between the conical surface of the second flared opening and the inner wall of the inner body is α, and α satisfies: 45°≤α≤60°.

4. The battery pack according to claim 1, characterized in that, The thickness of the inner layer is A3mm, A2mm≥A3mm, and (A2-A3)mm satisfies: 0mm≤(A2-A3)mm≤2mm.

5. The battery pack according to claim 1, characterized in that, The outer body includes a thinning section that is nested and cooperates with the inner body, and a thickening section connecting the thinning sections; The inner wall of the inner layer is flush with the inner wall of the thickened section.

6. The battery pack according to claim 5, characterized in that, The thickness of the thinning section is A4mm, and the thickness of the thickening section is A5mm. The (A5-A4)mm satisfies the following condition: 1mm≤(A5-A4)mm≤3mm.

7. The battery pack according to claim 5, characterized in that, A mating surface is formed between the end face of the inner body and the end face of the thickened section.

8. The battery pack according to claim 7, characterized in that, One end of the heat exchange plate joint is a tapered section, which gradually narrows from the heat exchange plate joint toward the connecting pipe. The diameter of the larger end of the tapered section is D2mm, which is greater than the inner diameter D1mm of the inner body. Furthermore, (D2-D1)mm satisfies the following condition: 0.5mm≤(D2-D1)mm≤2mm.

9. The battery pack according to claim 8, characterized in that, The distance between the small end of the tapered segment and the mating surface is hmm, where hmm satisfies: 2mm≤hmm≤8mm.

10. The battery pack according to claim 1, characterized in that, The outer wall of the outer layer is provided with at least two reinforcing ribs, the reinforcing ribs are in a ring structure, and at least two of the reinforcing ribs are distributed sequentially along the axial direction of the outer layer.

11. The battery pack according to claim 10, characterized in that, At least one of the reinforcing ribs is located at the corresponding position of the mating section between the inner layer and the heat exchange plate joint; The length of the heat exchange plate joint extending into the inner layer is H1mm, and the distance between the reinforcing rib and the end face of the second flared mouth is H2mm, where H1mm>H2mm, and (H1-H2)mm satisfies: 1mm≤(H1-H2)mm≤10mm.

12. The battery pack according to claim 1, characterized in that, The outer layer has a length of H3mm, the inner layer has a length of H4mm, and H4 / H3 satisfies: 0.1≤H4 / H3≤0.

3.

13. The battery pack according to claim 1, characterized in that, A reinforcing block is fixed to the outside of the first horn opening.

14. The battery pack according to claim 1, characterized in that, The outer layer has an injection hole located on the conical surface of the first flared opening, and the injection hole is used to injection mold the inner layer.

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