Battery module and battery pack

Abstract

The utility model relates to the technical field of batteries, and provides a battery module and a battery pack. The battery module comprises two shells which are buckled with each other, cylindrical battery cells arranged in the shells, and magnets, supporting structures are arranged on the inner walls of the shells in the buckling direction of the shells in a protruding and extending mode, and the two ends of the cylindrical battery cell are inserted into the supporting structures on the two shells respectively; at least one shell is provided with a magnet; and the magnet is arranged on the supporting structure so as to form magnetic attraction fixation of the cylindrical battery cell. According to the battery module disclosed by the utility model, the two shells with the supporting structures and the magnets are arranged, the supporting structures limit the positions of the cylindrical battery cells, the magnets firmly adsorb the steel shells of the cylindrical battery cells, and the cylindrical battery cells can be fixed in the shells without using an adhesive, so that when the battery module needs to be maintained, the cylindrical battery cells are more convenient to disassemble and assemble; and the maintenance convenience of the module is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, especially relates to a battery module. BACKGROUND

[0002] The cylindrical battery cell has good use performance and is widely used in the composition of the battery pack. In the use process of the battery pack, the temperature in the battery pack needs to be maintained within a suitable temperature range. However, under the condition of large-rate charging, the battery cell generates a large amount of heat, and the temperature distribution inside the battery pack is very uneven. If the temperature in the battery pack is too high, not only the use performance and the service life of the battery cell are affected, but also thermal runaway may occur, causing life and property losses. Therefore, the battery pack needs to be provided with a cooling device to cool each battery cell. One common battery cell cooling method is immersion cooling, which uses an insulating coolant to immerse the battery cell to quickly cool the battery cell.

[0003] The immersion cooling module of the cylindrical battery cell usually uses a battery cell gluing process, that is, an adhesive is used to fix each battery cell. When the module needs to be replaced, for example, maintenance is inconvenient. SUMMARY

[0004] Therefore, the utility model aims at providing a battery module to improve the maintenance convenience of the module.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A battery module includes two housings that are mutually buckled, cylindrical battery cells arranged in the housings, and a magnet.

[0007] The inner wall of the housing protrudes and extends in the buckling direction of the housing to provide a support structure, and the two ends of the cylindrical battery cell are respectively inserted into the support structure on the two housings.

[0008] At least one of the housings is provided with the magnet, and the magnet is arranged on the support structure to form a magnetic attraction fixing of the cylindrical battery cell.

[0009] Further, the support structure includes at least two support claws.

[0010] The support claw is provided with a limiting groove matched with the shape of the outer wall of the cylindrical battery cell to limit the radial movement of the cylindrical battery cell.

[0011] To limit the radial movement of the cylindrical battery cell.

[0012] Furthermore, the groove wall of the limiting groove is provided with a limiting part to limit the maximum insertion depth of the cylindrical battery cell in the support structure.

[0013] Furthermore, the magnet is embedded in the limiting part.

[0014] Furthermore, the housing is provided with a wiring hole facing the axial end of the cylindrical battery cell.

[0015] Furthermore, each of the support structures is provided with four support claws, which are evenly distributed and spaced apart along the circumference of the cylindrical battery cell.

[0016] Furthermore, the battery module also includes a mounting base, and both housings are detachably connected to the mounting base.

[0017] Furthermore, a connecting plate is provided at one end of the housing that contacts the mounting base, extending along the surface of the mounting base, and the connecting plate is bolted to the mounting base.

[0018] Furthermore, reinforcing ribs are provided between the connecting plate and the housing.

[0019] Furthermore, the housing is provided with flow holes that allow coolant to pass through.

[0020] Compared with the prior art, this utility model has the following advantages:

[0021] The battery module of this invention features two housings with supporting structures and a magnet. The supporting structures restrict the position of the cylindrical battery cells, while the magnets firmly attract the steel shells of the cylindrical battery cells. The cylindrical battery cells can be fixed in the housings without the use of adhesives. When the battery module needs maintenance, it is more convenient to disassemble and assemble the cylindrical battery cells, thus improving the maintenance convenience of the module.

[0022] Secondly, the support claws with limiting grooves make the installation of cylindrical cells more convenient and ensure stable limiting effect. They also utilize the inherent strength of the cylindrical cells to enhance the overall strength of the battery module and increase the contact area between the cylindrical cells and the coolant. The limiting parts ensure that each cylindrical cell is inserted to a consistent depth into the support structure, facilitating the locking of the two housings. Embedding the magnet in the limiting parts prevents the cylindrical cells from directly colliding with the magnet, thus protecting the magnet.

[0023] In addition, the shell is provided with a wiring hole at an axial end of the cylindrical battery cell, so that the cylindrical battery cell in the shell can be conveniently wired, and the shell can be filled with and drained of cooling liquid. The support structure is provided with four support claws which are evenly and spacedly arranged along the axial direction of the cylindrical battery cell, so that the cylindrical battery cell is well positioned. The two shells are detachably connected to the mounting base, so that the shells can be conveniently disassembled, and the battery module can be installed in the battery pack through the mounting base.

[0024] Furthermore, the connecting plate can improve the connecting strength between the shell and the mounting base, and facilitate the use of bolts. The reinforcing ribs can improve the structural strength between the shell and the connecting plate. The overflow hole can allow more cooling liquid to flow into and out of the shell, and improve the heat dissipation effect of the cylindrical battery cell.

[0025] Another purpose of the utility model is to provide a battery pack which is provided with the battery module.

[0026] The battery pack has the same beneficial effects as the battery module of the prior art, and will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0027] The drawings which form a part of the present application are intended to provide a further understanding of the present application, and the illustrative embodiments of the present application and their description serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0028] Figure 1 The battery module has the same beneficial effects as the battery module of the prior art, and will not be described here.

[0029] Figure 2 The battery module has the same beneficial effects as the battery module of the prior art, and will not be described here.

[0030] Figure 3 The battery module has the same beneficial effects as the battery module of the prior art, and will not be described here.

[0031] Figure 4 The battery module has the same beneficial effects as the battery module of the prior art, and will not be described here.

[0032] Figure 5 The battery module has the same beneficial effects as the battery module of the prior art, and will not be described here.

[0033] BRIEF DESCRIPTION OF DRAWINGS

[0034] 1, shell;

[0035] 101, support claw; 1011, limiting groove; 1012, limiting part; 102, wiring hole; 103, overflow hole;

[0036] 2. cylindrical cell;

[0037] 3. magnet;

[0038] 4. mounting seat;

[0039] 5. connecting plate;

[0040] 6. reinforcing rib. DETAILED DESCRIPTION

[0041] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0042] In the following description, specific details are set forth in order to provide a thorough understanding of embodiments of the application. However, persons having ordinary skill in the art will appreciate that embodiments of the application can be practiced without the specific details, other embodiments can be implemented without these specific details. In other instances, well-known systems, structures, circuits, and processes have not been described in detail in order to avoid obscuring the application.

[0043] In the description of the present application, it should be noted that if the terms indicating the orientation or position relationship such as "upper", "lower", "inner", "outer" and the like appear, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the application. The application must have a specific orientation, structure and operation. Therefore, it cannot be understood as limiting the application. In addition, if the terms "first", "second" and the like appear, they are also used for description purposes only and cannot be understood as indicating or implying relative importance.

[0044] In addition, in the description of the present application, unless otherwise explicitly limited, the terms "mounting", "connection", "connection", "connector" should be understood broadly. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood in combination with the specific circumstances.

[0045] The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0046] Embodiment one

[0047] The present embodiment relates to a battery module to improve the maintenance convenience of the module.

[0048] Overall structure, refer to Figures 1 to 3As shown, the battery module of the embodiment includes two housings 1 that are buckled to each other, cylindrical battery cells 2 arranged in the housings 1, and a plurality of magnets 3. The inner wall of the housing 1 is provided with a support structure that protrudes and extends along the buckling direction of the housing 1, and the two ends of the cylindrical battery cell 2 are respectively inserted into the support structures on the two housings 1. At least one of the housings 1 is provided with a magnet 3. The magnet 3 is arranged on the support structure to constitute a magnetic attraction fixing of the cylindrical battery cell 2.

[0049] As arranged above, the battery module of the embodiment can fix the cylindrical battery cell 2 in the housing 1 without using adhesive by arranging two housings 1 with support structures and magnets 3. The support structures limit the position of the cylindrical battery cell 2, and the magnets 3 attract the steel shell of the cylindrical battery cell 2 firmly. When the battery module needs to be repaired, the cylindrical battery cell 2 is more convenient to disassemble and assemble, thereby improving the maintenance convenience of the module.

[0050] Based on the above overall introduction, still referring to Figures 1 to 3 Specifically, the magnet 3 of the embodiment is used to attract the steel shell of the cylindrical battery cell 2 to fix the cylindrical battery cell 2 firmly in the support structure. The support structure extends along the buckling direction of the housing 1, and the purpose is to enable the cylindrical battery cell 2 to be smoothly inserted into the support structure when the two housings 1 are buckled. In specific implementation, all the cylindrical battery cells 2 are first inserted into the support structures on one housing 1, and then the other housing 1 is buckled to the cylindrical battery cells 2, so that the positive and negative ends of the cylindrical battery cell 2 are respectively inserted into the support structures on different housings 1. The number of cylindrical battery cells 2 is adjusted according to actual needs, and the number of cylindrical battery cells 2 in the embodiment is eight.

[0051] Among them, for the specific form of the support structure, the support structure of the embodiment includes at least two support claws 101, and the support claw 101 is provided with a limiting groove 1011 matched with the shape of the outer wall of the cylindrical battery cell 2 to limit the radial movement of the cylindrical battery cell 2. The support claw 101 can better limit the cylindrical battery cell 2 between the support claws 101 of the same support structure, cooperate with the limiting groove 1011, have a larger contact area with the cylindrical battery cell 2, and have a better limiting effect on the cylindrical battery cell 2. The support claw 101 provided with the limiting groove 1011 can also use the strength of the cylindrical battery cell 2 to enhance the overall strength of the battery module, and compared with the tubular support structure, the support claw 101 structure of the embodiment can also increase the contact area of the cylindrical battery cell 2 and the cooling liquid.

[0052] It should be noted that the plug-in relationship between the cylindrical battery cell 2 and the support structure of the embodiment is a clearance fit, that is, there is a gap between the cylindrical battery cell 2 and at least part of the limiting groove 1011. The gap can facilitate the radial fine adjustment of the position of the cylindrical battery cell 2 to facilitate the connection of the bus bar and the pole of the cylindrical battery cell 2.

[0053] Preferably, each support structure in the embodiment is provided with four support claws 101, which are arranged at equal intervals along the circumference of the cylindrical battery cell 2. The support effect of the four support claws 101 on the cylindrical battery cell 2 is better, and the radial limiting effect on the cylindrical battery cell 2 is stronger.

[0054] Secondly, in order to fix the axial position of the cylindrical battery cell 2 in the support structure, referring to Figure 3 and Figure 4 , the groove wall of the limiting groove 1011 is outwardly provided with a limiting portion 1012 to limit the maximum insertion depth of the cylindrical battery cell 2 in the support structure. When the two shells 1 are buckled, the limiting portions 1012 in the two shells 1 will abut against the axial end of the steel shell of the cylindrical battery cell 2, cooperating with the magnetic attraction effect of the magnet 3, so as to fix the position of the cylindrical battery cell 2 in the battery module. Compared with the adhesive form in the prior art, it can be more convenient to install and disassemble, and the operation difficulty is lower.

[0055] In addition, for the specific wiring mode of the cylindrical battery cell 2, the shell 1 of the embodiment is provided with a wiring hole 102 opening towards the axial end of the cylindrical battery cell 2, and the bus bar is connected with the positive and negative poles of the cylindrical battery cell 2 in the shell 1 from the outside through the wiring hole 102. After the cylindrical battery cell 2 is fixed by the two shells 1 and the magnet 3, it is not easy to shake, which is more conducive to the connection of the bus bar. In addition, during the specific use of the battery module, the external cooling liquid can enter the shell 1 through the wiring hole 102, and then enter the four around of the cylindrical battery cell 2 through the gap between the adjacent support claws 101. At the same time, the wiring hole 102 can also provide a path for the cooling liquid to enter the battery module.

[0056] Furthermore, in order to improve the use stability of the battery module, the magnet 3 of the embodiment is embedded in the limiting portion 1012 and directly opposite to the end of the steel shell of the cylindrical battery cell 2 to attract the cylindrical battery cell 2. The magnet 3 embedded in the limiting portion 1012 will not be dislocated, so that the cylindrical battery cell 2 is not easy to move radially in the support structure, which is convenient for the subsequent connection of the bus bar and the cylindrical battery cell 2. The magnet 3 embedded in the limiting portion 1012 is also not easy to be collided by the outside, and the limiting portion 1012 can play a role in protecting the magnet 3.

[0057] It can be understood that the limiting portion 1012 can also not be provided on the support claw 101, so that the end of the cylindrical battery cell 2 directly abuts against the inner wall of the shell, and the inner walls of the two shells directly limit the axial direction of the cylindrical battery cell 2. However, the gap between the cylindrical battery cell 2 and the inner wall of the shell 1 is very small, which is not conducive to the flow of the cooling liquid from the wiring hole 102 into the shell 1.

[0058] Regarding the buckling fixing mode of the two shells 1, referring to Figure 1 and Figure 2As shown, the battery module of the embodiment further comprises a mounting base 4, and the two housings 1 are detachably connected to the mounting base 4. By detachably connecting the two housings 1 to the mounting base 4, the disassembly of the housings 1 can be facilitated, and meanwhile, the battery module can be installed in a battery pack through the mounting base 4, for example, by bolt connecting the mounting base 4 to a bottom plate.

[0059] Specifically, the end of the housing 1 in contact with the mounting base 4 is provided with a connecting plate 5 extending along the surface of the mounting base 4, and the connecting plate 5 is bolt connected to the mounting base 4, and both the connecting plate 5 and the mounting base 4 are provided with bolt holes. The connecting plate 5 can be provided with a larger contact area with the mounting base 4, so as to improve the connection strength between the housing 1 and the mounting base 4, and meanwhile, an installation position can be provided to facilitate the use of mounting bolts to connect the connecting plate 5 and the mounting base 4. The connecting plate 5 of the embodiment is integrally formed with the housing 1.

[0060] Preferably, in order to enhance the connection strength between the housing 1 and the connecting plate 5, the embodiment is provided with a reinforcing rib 6 between the connecting plate 5 and the housing 1. The reinforcing rib 6 can increase the cross-sectional area of the connecting portion of the connecting plate 5 and the housing 1 and change the cross-sectional shape, so that the tensile, compressive and bending resistance of the connecting portion is enhanced. The reinforcing rib 6 of the embodiment is a triangular plate, two edges of which are connected to the housing 1 and the connecting plate 5, respectively, and a plurality of reinforcing ribs 6 are arranged along the connecting line of the housing 1 and the connecting plate 5, and are integrally formed with the housing 1 and the connecting plate 5, so as to further enhance the overall strength of the housing 1 and the connecting plate 5.

[0061] The battery module of the embodiment can fix the cylindrical battery cell 2 in the housing 1 without using adhesive by arranging two housings 1 with supporting structures and the magnet 3, the supporting claws 101 of the supporting structures limit the position of the cylindrical battery cell 2, and the magnet 3 firmly adsorbs the steel shell of the cylindrical battery cell 2. When the battery module needs to be repaired, the cylindrical battery cell 2 can be disassembled more conveniently, and the maintenance convenience of the module is improved. Meanwhile, the design of the battery module is simple, the processing is convenient, the manufacturing cost is low, and the application prospect is good.

[0062] Embodiment Two

[0063] The embodiment relates to a battery module, which refers to Figure 5 As shown, the battery module of the embodiment is different from the battery module of the embodiment one in that the housing 1 is provided with an overflow hole 103 allowing the cooling liquid to pass through.

[0064] The overflow holes 103 of the embodiment are arranged on both sides of the shell 1, and face the outer peripheral wall of the cylindrical battery cell 2, so that the cooling liquid can flow into the shell 1 from one side of the overflow holes 103 and flow out of the shell 1 from the other side of the overflow holes 103 during circulation of the cooling liquid. Of course, the arrangement position of the overflow holes 103 can be specifically selected according to the flow direction of the cooling liquid during circulation of the battery module after installation, for example, being arranged at the top and bottom of the shell 1. In addition, the overflow holes 103 of the embodiment are circular, and other shapes such as polygonal and elliptical can also be used.

[0065] The arrangement of the overflow holes 103 on the shell 1 can make the cooling liquid more easily flow into and out of the shell 1, and can improve the flow rate of the cooling liquid in the battery module, which is beneficial to enhancing the heat dissipation performance of the battery module.

[0066] Embodiment Three

[0067] The embodiment relates to a battery pack provided with the battery module of embodiment one.

[0068] By arranging the battery module of embodiment one in the battery pack, the battery pack is more convenient to install and disassemble, and the cylindrical battery cell is also more convenient to disassemble when the battery module in the battery pack needs to be repaired, so that the maintenance convenience of the battery pack is improved.

[0069] Embodiment Four

[0070] The embodiment relates to a battery pack provided with the battery module of embodiment two.

[0071] By arranging the overflow holes on the shell of the battery module, the cooling liquid can more easily flow into and out of the shell, and the flow rate of the cooling liquid in the battery module can be improved, which is beneficial to enhancing the heat dissipation performance of the immersed cooling battery pack.

[0072] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A battery module, characterized in that: It includes two interlocking housings, a cylindrical battery cell disposed within the housings, and a magnet; A support structure is provided on the inner wall of the housing along the fastening direction of the housing, and the two ends of the cylindrical battery cell are respectively inserted into the support structures on the two housings; At least one of the housings is provided with the magnet; the magnet is disposed on the support structure to form a magnetic attraction fixation for the cylindrical cell.

2. The battery module according to claim 1, characterized in that: The support structure includes at least two support claws; The support claw is provided with a limiting groove that matches the shape of the outer wall of the cylindrical battery cell to restrict the radial movement of the cylindrical battery cell.

3. The battery module according to claim 2, characterized in that: The limiting groove has a limiting part protruding outward from the groove wall to limit the maximum insertion depth of the cylindrical battery cell in the support structure.

4. The battery module according to claim 3, characterized in that: The magnet is embedded in the limiting part; and / or The housing is provided with a wiring hole facing the axial end of the cylindrical battery cell.

5. The battery module according to claim 2, characterized in that: Each of the support structures is provided with four support claws, which are evenly distributed and spaced apart along the circumference of the cylindrical battery cell.

6. The battery module according to claim 1, characterized in that: The battery module also includes a mounting base that can detachably connect the two housings.

7. The battery module according to claim 6, characterized in that: A connecting plate extends along the surface of the mounting base at one end of the housing that contacts the mounting base, and the connecting plate is bolted to the mounting base.

8. The battery module according to claim 7, characterized in that: A reinforcing rib is provided between the connecting plate and the shell.

9. The battery module according to any one of claims 1 to 8, characterized in that: The housing is provided with flow holes that allow coolant to pass through.

10. A battery pack, characterized in that: The battery pack is provided with the battery module as described in any one of claims 1 to 9.

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