Battery module tightening device

Abstract

The utility model relates to the technical field of batteries, in particular to a battery module tightening device which comprises a bottom shell, a top cover and a tightening assembly, the top cover is detachably connected with the bottom shell, and a battery module containing cavity is formed between the top cover and the bottom shell; the restraining assembly is arranged at the position, close to the center, of the top cover and used for being connected with the bottom shell. According to the battery module tightening device, the restraining assembly is arranged at the position, close to the center, of the top cover, the top cover can be connected with the bottom shell through the restraining assembly, in this way, under the restraining of the restraining assembly, mutual restraining pulling force exists between the top cover and the bottom shell, and therefore the situation that the top cover or the bottom shell is deformed due to bulging of the battery module can be avoided; the tightening effect on the battery module can be effectively improved, and the failure of the battery is prevented.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery module clamping devices. Background Technology

[0002] With the rapid development of electric vehicles, energy storage systems, and portable electronic devices, lithium batteries, as their core power source, have seen their performance, safety, and reliability become the focus of industry attention. Prismatic lithium battery modules are a common battery packaging form. However, prismatic lithium battery modules tend to bulge outwards with increasing charge-discharge cycles, leading to battery failure. Therefore, a clamping structure is needed to secure them.

[0003] Currently, the clamping structure of prismatic lithium battery modules is achieved by wrapping a sheet metal structure around the outer layer of the battery pack. However, during battery operation, the bulging point usually starts from the middle position. The sheet metal structure has generally low strength and a long connection span, which causes the sheet metal to deform along with the battery module when it bulges. Utility Model Content

[0004] This application provides a battery module clamping device to solve the problem in the prior art that the clamping sheet metal deforms when the battery module bulges.

[0005] This application provides a battery module clamping device, including:

[0006] Bottom shell;

[0007] The top cover is detachably connected to the bottom shell, and a battery module housing cavity is formed between the top cover and the bottom shell;

[0008] A restraint assembly, located near the center of the top cover, is used to connect to the bottom shell.

[0009] In one possible design, the restraint components include:

[0010] The first connector is located on the bottom shell;

[0011] The second connector is disposed on the top cover, opposite to the first connector, and can be detachably connected to the first connector.

[0012] In one possible design, the top cover has a through hole, and the restraint assembly also includes a pressure plate, which is located at the through hole of the top cover. The pressure plate has a central hole coaxial with the through hole, and the second connector passes through the through hole and the central hole.

[0013] In one possible design, the restraint assembly also includes a pressure bar disposed on the outside of the pressure plate, extending radially from the outside of the pressure plate toward the edge of the top cover.

[0014] In one possible design, a limiting groove is provided on the top cover, and the pressure rod is set in the limiting groove.

[0015] In one possible design, a self-locking component is also included, which is located at the connection between the top cover and the bottom shell to connect the top cover and the bottom shell.

[0016] In one possible design, the top cover is provided with a guide sleeve, the bottom shell is provided with a locking sleeve, and the self-locking assembly includes:

[0017] The locking rod passes through the guide sleeve;

[0018] A return spring is located inside the guide sleeve and is connected to one end of the locking rod. The return spring is used to allow the other end of the locking rod to pass through the locking sleeve.

[0019] In one possible design, the locking rod has a lever, and the side wall of the guide sleeve has an elongated hole through which the lever passes.

[0020] In one possible design, the top cover is hinged to one end of the bottom shell, and the other end of the top cover is connected to the bottom shell via a self-locking assembly.

[0021] In one possible design, the top cover and bottom shell each have internal cavities, and reinforcing ribs are installed inside the cavities.

[0022] The beneficial effects of this application are as follows:

[0023] The battery module clamping device of this application provides a restraining component near the center of the top cover. The restraining component connects the top cover to the bottom shell. Under the constraint of the restraining component, there is a mutual restraining tension between the top cover and the bottom shell, which can apply pressure to the battery module evenly and stably. This can prevent the top cover or bottom shell from deforming due to the swelling of the battery module, effectively improve the clamping effect of the battery module, and prevent battery failure. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the battery module clamping device provided in the embodiments of this application;

[0026] Figure 2 Structural breakdown of the battery module clamping device provided in the embodiments of this application Figure 1 ;

[0027] Figure 3Structural breakdown of the battery module clamping device provided in the embodiments of this application Figure 2 ;

[0028] Figure 4 This is a schematic diagram of the top cover of the battery module clamping device provided in the embodiments of this application;

[0029] Figure 5 for Figure 3 Side view of the battery module clamping device.

[0030] Figure label:

[0031] 100. Bottom shell; 110. Bottom plate; 111. First side plate; 112. Second side plate; 113. Stepped groove; 200. Top cover; 210. Top plate; 211. First end plate; 212. Second end plate; 213. Through hole; 214. Limiting groove; 300. Restraint assembly; 310. First connector; 320. Second connector; 330. Pressure plate; 331. Center hole; 340. Pressure rod; 400. Self-locking assembly; 410. Guide sleeve; 411. Long hole; 420. Locking sleeve; 430. Locking rod; 440. Return spring; 450. Pulley; 500. Reinforcing rib plate. Detailed Implementation

[0032] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, 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.

[0033] The following is combined Figures 1-5 This describes the battery module clamping device provided in the embodiments of this application.

[0034] Reference Figure 1As shown, the battery module fastening device provided in this application embodiment includes a bottom shell 100, a top cover 200, and a restraint assembly 300. The top cover 200 is detachably connected to the bottom shell 100, and a battery module receiving cavity is formed between the top cover 200 and the bottom shell 100, in which the battery module is placed. The restraint assembly 300 is disposed near the center of the top cover 200 and is used to connect with the bottom shell 100. In some specific embodiments, the restraint components 300 include multiple restraint components 300, which are respectively distributed at positions near the center of the top cover 200. For example, the multiple restraint components 300 are spaced apart along the length direction of the top cover 200, or the multiple restraint components 300 are arranged in a ring with the center of the top cover 200 as the center. The multiple restraint components 300 can apply pressure to the battery module evenly and stably, so that each restraint component 300 can evenly distribute the pressure on the middle of the top cover 200 due to the expansion of the battery module, and prevent the middle of the top cover 200 from deforming. In some specific embodiments, the restraint components 300 can be steel cables or pull rods, etc. The steel cables or pull rods are arranged along the height direction of the bottom shell 100, with one end connected to the bottom shell 100 and the other end connected to the top cover 200, so that the top cover 200 and the bottom shell 100 can generate opposing tensions, so that the top cover 200 and the bottom shell 100 are mutually restrained.

[0035] Using the technical solution provided in the above embodiments, by setting a restraint component 300 near the center of the top cover 200, the restraint component 300 can connect the top cover 200 to the bottom shell 100. Under the constraint of the restraint component 300, there is a mutual restraining tension between the top cover 200 and the bottom shell 100, which can prevent the top cover 200 or the bottom shell 100 from deforming due to the expansion of the battery module. This can effectively improve the binding effect on the battery module and prevent battery failure.

[0036] Reference Figure 2 , Figure 3As shown, in some embodiments provided in this application, each restraint component 300 includes a first connector 310 and a second connector 320. The first connector 310 is disposed on the bottom shell 100; the second connector 320 is disposed on the top cover 200 and is disposed opposite to the first connector 310. It can be detachably connected to the first connector 310. By providing the first connector 310 and the second connector 320, the top cover 200 and the bottom shell 100 can be easily disassembled. In some specific embodiments, the first connector 310 is a column, which is arranged along the height direction of the bottom shell 100. One end of the column is welded or threaded to the bottom shell 100, and the other end of the column faces the second connector 320 and has a concave threaded hole. The second connector 320 is a bolt, which is inserted into the top cover 200. The end of the bolt can extend into the threaded hole. By adjusting the depth of the bolt extending into the threaded hole, the tightness of the connection between the top cover 200 and the bottom shell 100 can be adjusted to enhance the sealing and stability of the connection between the top cover 200 and the bottom shell 100. In other embodiments, the first connector 310 and the second connector 320 may also be a snap-fit ​​structure. For example, the first connector 310 is an outer cylinder, and the second connector 320 is an inner shaft. One end of the inner shaft is welded to the inner wall of the bottom shell 100. A limiting block is provided on the outer side wall of the inner shaft. A vertical guide groove matching the limiting block is provided on the inner wall of the outer cylinder. An annular slot is also provided on the inner wall of the outer cylinder. The annular slot communicates with the guide groove. After the limiting block moves along the guide groove to the annular slot, the inner shaft is rotated to move the limiting block into the annular slot, thereby snapping the inner shaft into the outer cylinder to enhance the sealing and stability of the connection between the top cover 200 and the bottom shell 100.

[0037] Reference Figure 2 As shown, in some embodiments provided in this application, the top cover 200 is provided with a through hole 213, and each restraint component 300 also includes a pressure plate 330. The pressure plate 330 is disposed at the through hole 213 of the top cover 200, and the pressure plate 330 is provided with a central hole 331 coaxial with the through hole 213. The second connector 320 passes through the through hole 213 and the central hole 331. In some specific embodiments, the pressure plate 330 is disc-shaped, with a groove formed in the center of the pressure plate 330. The bolt passes through the central hole 331 of the pressure plate 330 and the through hole 213 of the top cover 200 from top to bottom, and enters the threaded hole at the end of the column. The bolt is tightened so that the end of the bolt engages with the thread of the column. When the head of the bolt is inserted into the groove in the center of the pressure plate 330, the bolt is tightened in place. In this way, the tension of the bolt on the top cover 200 can be evenly distributed on the pressure plate 330, and the pressure plate 330 then forms a uniform pressure on the top cover 200, which helps to prevent stress concentration in the top cover 200.

[0038] Reference Figure 2As shown, in some embodiments provided in this application, each restraint assembly 300 further includes a pressure bar 340, which is disposed on the outside of the pressure plate 330 and extends radially from the outside of the pressure plate 330 toward the edge of the top cover 200. In some specific embodiments, the pressure rod 340 includes a first pressure rod 340 and a second pressure rod 340. The first pressure rod 340 extends along the length of the top cover 200, and the second pressure rod 340 extends along the width of the top cover 200. A circular groove is provided at the intersection of the first pressure rod 340 and the second pressure rod 340, and a mounting hole is provided at the center of the circular groove. The pressure plate 330 is disposed in the circular groove. The central hole 331 of the pressure plate 330 is coaxially arranged with the mounting hole. The bolt can pass through the central hole 331 of the pressure plate 330, the mounting hole at the intersection of the first pressure rod 340 and the second pressure rod 340, and the through hole 213 of the top cover 200 from top to bottom and enter the threaded hole at the end of the column. In this way, by setting the pressure rod 340, the pressure of the pressure plate 330 on the top cover 200 can be further dispersed, thereby preventing the top cover 200 from deforming and helping to keep the surface of the top cover 200 flat. In some specific embodiments, a limiting groove 214 is provided on the top cover 200. The shape of the limiting groove 214 is consistent with that of the pressure rod 340. The inner wall of the limiting groove 214 is in clearance fit with the outer surface of the pressure rod 340, so that the pressure rod 340 is stuck in the limiting groove 214. On the one hand, it can prevent the pressure rod 340 from shifting, and on the other hand, it can keep the surface of the top cover 200 flat.

[0039] Reference Figure 3 , Figure 5As shown, in some embodiments of this application, the battery module clamping device further includes a self-locking component 400. The self-locking component 400 is disposed at the connection between the top cover 200 and the bottom shell 100. The self-locking component 400 is used to connect the top cover 200 and the bottom shell 100. In this way, the self-locking component 400 can prevent the top cover 200 and the bottom shell 100 from shifting, which is beneficial to enhancing the sealing and stability of the connection between the top cover 200 and the bottom shell 100. In some specific embodiments, a guide sleeve 410 protrudes from one end of the top cover 200, and a locking sleeve 420 protrudes from one end of the bottom shell 100. The guide sleeve 410 and the locking sleeve 420 are staggered in the height direction of the bottom shell 100. The self-locking assembly 400 includes a locking rod 430 and a return spring 440. The return spring 440 is disposed inside the guide sleeve 410. There are two locking rods 430. The two ends of the return spring 440 are respectively connected to the inner ends of the two locking rods 430. Under the elastic force of the return spring 440, the outer ends of the two locking rods 430 can extend from the two ends of the guide sleeve 410 and pass through the locking sleeve 420, thereby locking the top cover 200 and the bottom shell 100, preventing the top cover 200 and the bottom shell 100 from shifting, which helps to enhance the sealing and stability of the connection between the top cover 200 and the bottom shell 100. In some specific embodiments, each locking rod 430 has a lever 450, and the side wall of the guide sleeve 410 has an elongated hole 411. The length direction of the elongated hole 411 is parallel to the locking rod 430. The lever 450 passes through the elongated hole 411. By squeezing the two levers 450, the two levers 450 move towards each other, which can squeeze the return spring 440, so that the outer end of the locking rod 430 enters the guide sleeve 410. When the top cover 200 is installed in place, the guide sleeve 410 and the locking sleeve 420 are coaxial. At this time, when the two levers 450 are released, under the elastic force of the return spring 440, the outer ends of the two locking rods 430 can extend from both ends of the guide sleeve 410 and pass through the locking sleeve 420. In this way, the top cover 200 and the bottom shell 100 can be quickly locked.

[0040] Reference Figure 3As shown, in some embodiments provided in this application, the top cover 200 is hinged to one end of the bottom shell 100, and the other end of the top cover 200 and the bottom shell 100 are connected by a self-locking assembly 400, thus facilitating quick assembly and disassembly of the top cover 200 and the bottom shell 100. In some specific embodiments, the bottom shell 100 includes a bottom plate 110, a first side plate 111, and a second side plate 112. The first side plate 111 and the second side plate 112 are perpendicular to the bottom plate 110, and are disposed opposite to each other on the front and rear sides of the bottom plate 110. The top cover 200 includes a top plate 210, a first end plate 211, and a second end plate 212. The first end plate 211 and the second end plate 212 are perpendicular to the top plate 210, and are disposed opposite to each other on the left and right sides of the top plate 210. At both ends, the top plate 210 and the bottom plate 110 are arranged parallel to each other vertically; the first end plate 211 is hinged to the right edge of the bottom plate 110 by a pin, and the second end plate 212 is connected to the left edge of the bottom plate 110 by a self-locking assembly 400. By rotating the top cover 200 around the pin, the top cover 200 and the bottom shell 100 can be quickly disassembled and assembled; stepped grooves 113 are respectively opened on the upper side of the first side plate 111 and the second side plate 112, and the front and rear sides of the top cover 200 can be locked in the stepped grooves 113, thereby enhancing the sealing and stability of the device.

[0041] Reference Figure 4 As shown, in some embodiments provided in this application, the top cover 200 and the bottom shell 100 are respectively provided with cavities, and reinforcing ribs 500 are provided in the cavities. Specifically, the top cover 200 and the bottom shell 100 respectively include an inner layer plate and an outer layer plate, and the inner layer plate and the outer layer plate are connected by the reinforcing ribs 500. In some embodiments, the reinforcing ribs 500 are perpendicular to the inner layer plate or the outer layer plate; in other embodiments, the reinforcing ribs 500 form a certain angle with the inner layer plate or the outer layer plate, so that two adjacent reinforcing ribs 500 form a triangle with the inner layer plate or the outer layer plate, thereby effectively enhancing the deformation resistance of the top cover 200 and the bottom shell 100.

[0042] This application also provides a battery, which includes the battery module clamping device in the above embodiments.

[0043] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery module clamping device, characterized in that, include: Bottom shell; The top cover is detachably connected to the bottom shell, and a battery module receiving cavity is formed between the top cover and the bottom shell; A restraint assembly is located near the center of the top cover and is used to connect with the bottom shell.

2. The battery module clamping device according to claim 1, characterized in that, The restraint assembly includes: A first connecting member is disposed on the bottom shell; The second connector is disposed on the top cover, opposite to the first connector, and can be detachably connected to the first connector.

3. The battery module clamping device according to claim 2, characterized in that: The top cover has a through hole, and the restraint assembly also includes a pressure plate. The pressure plate is disposed at the through hole of the top cover, and the pressure plate has a central hole coaxial with the through hole. The second connector passes through the through hole and the central hole.

4. The battery module clamping device according to claim 3, characterized in that: The restraint assembly also includes a pressure bar disposed on the outside of the pressure plate, the pressure bar extending radially from the outside of the pressure plate toward the edge of the top cover.

5. The battery module clamping device according to claim 4, characterized in that: The top cover has a limiting groove, and the pressure rod is disposed in the limiting groove.

6. The battery module clamping device according to any one of claims 1-5, characterized in that: It also includes a self-locking component, which is disposed at the connection between the top cover and the bottom shell, for connecting the top cover and the bottom shell.

7. The battery module clamping device according to claim 6, characterized in that, The top cover is provided with a guide sleeve, the bottom shell is provided with a locking sleeve, and the self-locking assembly includes: A locking rod is inserted into the guide sleeve; A return spring is disposed inside the guide sleeve and connected to one end of the locking rod. The return spring is used to allow the other end of the locking rod to pass through the locking sleeve.

8. The battery module clamping device according to claim 7, characterized in that: The locking rod has a lever, and the side wall of the guide sleeve has an elongated hole, through which the lever passes.

9. The battery module clamping device according to claim 6, characterized in that: The top cover is hinged to one end of the bottom shell, and the other end of the top cover is connected to the bottom shell via the self-locking assembly.

10. The battery module clamping device according to any one of claims 1-5, characterized in that: The top cover and the bottom shell each have a cavity inside, and a reinforcing rib is provided inside the cavity.

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