Battery pack multilayer module fixing structure and battery pack

Abstract

The application relates to the technical field of battery packs, in particular to a battery pack multilayer module fixing structure and a battery pack. The battery pack multilayer module fixing structure comprises a first layer module and a second layer module which are stacked, the second layer module is stacked on the first layer module, the first layer module and the second layer module comprise end plates and side plates, the end plates comprise front end plates, middle end plates and rear end plates, the side plates comprise left side plates and right side plates, the front end plates and the rear end plates are connected with two ends of the left side plates and the right side plates respectively, the middle end plates are connected with the middle parts of the left side plates and the right side plates, and adjustable downward pressing devices are arranged below the end plates of the second layer module. The battery pack multilayer module fixing structure and the battery pack have the advantages that the adjustable downward pressing devices are arranged below the end plates of the second layer module, the support surface height is adjusted, the support points after stacking are guaranteed to be in the same plane, and the problem of unstable height size after stacking or even over-dimensioning is solved.

Description

Technical Field

[0001] This application relates to the field of new energy power battery pack technology, and in particular to a multi-layer module fixing structure for a battery pack and a battery pack. Background Technology

[0002] Battery modules are an important component of the power battery pack in new energy vehicles. Their spatial arrangement within the battery pack is generally achieved in three forms: "stacked", "laid out", and "laid out + stacked". The specific arrangement suitable for a battery pack largely depends on the space available in the vehicle chassis.

[0003] The challenge of using a "stacked" arrangement lies in ensuring that the lower-level modules evenly bear the weight pressure from the upper-level modules and provide stable support and fixation for the upper-level modules. For larger modules, the lower-level modules must provide multiple support points for the upper-level modules.

[0004] Current module assembly technology often employs an "end plate + side plate" process. This involves bolting multiple end plates to side plates to form the module's frame. The upper end of the end plate provides support points for the upper-layer module, and the lower end provides pressure points for the lower-layer module. This method cannot guarantee that all support / pressure points provided by the multiple end plates are on the same plane. When all support / pressure points cannot be guaranteed to be on the same plane, a series of problems arise during module stacking. For example, if some support points are lower than the plane formed by the other support points, some parts of the module will not receive effective support; if some support points are higher than the plane formed by the other support points, the module support will be unstable, resulting in excessive local stress on the supported modules. These issues lead to unstable module stacking structures, unstable or even excessive stacked height dimensions, and uneven support forces on the modules. Summary of the Invention

[0005] The technical problem to be solved by this application is to address the issues of unstable battery pack module stacking structure, unstable or even excessive height after stacking, and uneven support force on the modules, thereby improving the stability of battery pack stacking modules.

[0006] To address the aforementioned technical problems, in a first aspect, embodiments of this application disclose a multi-layer module fixing structure for a battery pack, comprising at least: a single-layer module and a second-layer module stacked on top of the single-layer module.

[0007] Both the first-layer module and the second-layer module include end plates and side plates;

[0008] The end plate includes a front end plate, a middle end plate, and a rear end plate;

[0009] The side panel includes a left side panel and a right side panel;

[0010] The end plate is located between the left side plate and the right side plate and is perpendicular to the side plate;

[0011] The front end plate and the rear end plate are respectively connected to the two ends of the left side plate and the right side plate;

[0012] The middle plate is connected to the middle of the left side plate and the right side plate;

[0013] An adjustable pressing device is provided below the end plate of the two-layer module.

[0014] Furthermore, the upper surfaces of the front end plate, the middle end plate, and the rear end plate of the first-layer module provide two fixed support surfaces for each of the second-layer modules.

[0015] Furthermore, the adjustable pressing devices are arranged alternately on both sides of the end plate.

[0016] Furthermore, each of the end plates of the two-layer module has two fixed support surfaces on its upper surface.

[0017] Furthermore, the lower end face of the end plate of the second-layer module is in contact with the upper end face of the end plate of the first-layer module.

[0018] Furthermore, the side plate of the first-layer module is provided with a bracket near each end plate, and the bracket has a through hole. The front end plate, the middle end plate, and the rear end plate of the second-layer module have lateral threaded holes at their bottoms, and the through holes and the lateral threaded holes are connected by bolts.

[0019] Furthermore, the end plate is provided with a long threaded hole;

[0020] The adjustable pressing device includes a screw, a pressure block, and a set screw. The bottom of the screw is provided with a ball head, and the upper end of the pressure block is connected and assembled with the ball head.

[0021] Furthermore, the set screw is connected to the top of the screw to lock the position of the pressure block.

[0022] Secondly, embodiments of this application disclose a battery pack, including a battery module and the aforementioned multi-layer module fixing structure, wherein the multi-layer module fixing structure is used to accommodate the battery module and form a battery pack.

[0023] By adopting the above technical solution, the battery pack multi-layer module fixing structure and battery pack described in the embodiments of this application have the following beneficial effects:

[0024] The battery pack multi-layer module fixing structure and battery pack described in this application embodiment, by setting an adjustable pressing device below the end plate of the second-layer module, adjusts the height of the support surface to ensure that the height of the entire support surface is on the same horizontal plane, which improves the accuracy of the height dimension after module stacking, solves the problem of unstable or even out-of-tolerance height dimension after stacking, simplifies the assembly steps and tooling design of the module frame, avoids the possibility of machining to unify the height of the support surface after the module frame is assembled, improves production efficiency, and saves production costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the battery pack multi-layer module fixing structure according to an embodiment of this application. Figure 1 ;

[0027] Figure 2 This is a schematic diagram of the battery pack multi-layer module fixing structure according to an embodiment of this application. Figure 2 ;

[0028] Figure 3 This is a schematic diagram of the adjustable pressing device according to one embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the screw-pressure block assembly according to one embodiment of this application. Figure 1 ;

[0030] Figure 5 This is a schematic diagram of the screw-pressure block assembly according to one embodiment of this application. Figure 2 ;

[0031] Figure 6 This is a schematic diagram of the top wire structure according to an embodiment of this application.

[0032] The following is supplementary explanation of the attached figures:

[0033] 10-End plate; 20-Side plate; 21-Bracket; 101-Front end plate; 102-Middle end plate; 103-Rear end plate; 201-Left side plate; 202-Right side plate; 30-Adjustable pressing device; 301-Screw; 302-Pressure block; 303-Setting screw; 304-Internal hexagonal hole; 40-Screw-Pressure block assembly. Detailed Implementation

[0034] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0035] The term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this application. In the description of this application, it should be understood that the terms "upper," "lower," "top," "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships 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. 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein.

[0036] On one hand, embodiments of this application provide a multi-layer module fixing structure for a battery pack, comprising at least one stacked module and two stacked modules, wherein the two stacked modules are stacked on top of the one stacked module. (See attached diagram) Figure 1 As shown, each module includes: an end plate 10 and a side plate 20.

[0037] The end plate consists of a front end plate 101, a middle end plate 102 and a rear end plate 103;

[0038] Side panel 20 includes left side panel 201 and right side panel 202;

[0039] End plate 10 is located between left side plate 201 and right side plate 202 and end plate 10 is perpendicular to side plate 20;

[0040] The front end plate 101 and the rear end plate 103 are respectively connected to the two ends of the left side plate 201 and the right side plate 202;

[0041] The middle plate 102 is connected to the middle of the left plate 201 and the right plate 202;

[0042] An adjustable pressing device 30 is provided below the end plate 20 of the two-layer module to adjust the height of the support point.

[0043] In this embodiment of the application, in order to better support the two-layer module, the upper surfaces of the front end plate 101, middle end plate 102, and rear end plate 103 of the first-layer module are raised at both ends and recessed in the middle, which can provide two fixed support surfaces for each of the two-layer modules.

[0044] Optionally, to facilitate the adjustment of the horizontal height of each support surface, an adjustable pressing device 30 is provided at the lower end of the front end plate 101, middle end plate 102, and rear end plate 103 of the second-layer module.

[0045] In this embodiment of the application, in order to achieve a better effect of adjusting the height of the support surface, as shown in the attached figure... Figure 2 As shown: The adjustable pressing devices 30 are arranged alternately on both sides of the lower end face of the end plate 10 of the two-layer module. That is, the three adjustable pressing devices 30 arranged below the end plate 20 of the two-layer module are not on the same straight line, and the two adjacent adjustable pressing devices 30 are located on both sides of the end plate 10.

[0046] In this embodiment, the upper surface of the end plate 10 of the two-layer module is raised at both ends and recessed in the middle, which can provide two fixed support surfaces for the upper module, making it convenient to continue to stack a three-layer module on top of the two-layer module. Optionally, the three-layer module and the two-layer module have the same structure. An adjustable pressing device 30 is also provided below the end plate of the three-layer module to facilitate the adjustment of the support point height. Multiple layers of modules can be continued to be stacked on top of the three-layer module in accordance with the above method to increase the module height.

[0047] To ensure the stress stability of the stacked module structure, the upper end face of the end plate 10 of the first-layer module and the lower end face of the end plate 10 of the second-layer module are in close contact, providing sufficient support for the second-layer module, improving the working environment of the cells inside the module, and to a certain extent improving the lifespan and working safety of the cells.

[0048] In another embodiment of this application, an optional method for connecting the first-layer module and the second-layer module is by bolt connection:

[0049] A bracket 21 is provided on the side plate 20 of the first-layer module near the front plate 101, the middle plate 102, and the rear plate 103. The bracket 21 has through holes. At the same time, lateral threaded holes are provided at the bottom of the front plate 101, the middle plate 102, and the rear plate 103 of the second-layer module. The through holes of the first-layer module and the lateral threaded holes of the second-layer module are connected by bolts to achieve the purpose of connecting the first-layer module and the second-layer module, and at the same time facilitate disassembly.

[0050] In this embodiment of the application, the structure of an optional adjustable pressing device is as follows: Figure 3 As shown:

[0051] The adjustable pressing device 30 includes a screw 301, a pressure block 302, and a set screw 303.

[0052] Figure 4 Schematic diagram of the screw-pressure block assembly Figure 1 , Figure 5 Schematic diagram of the screw-pressure block assembly Figure 2 ,like Figure 4 and Figure 5 As shown: The bottom of the screw 301 is provided with a ball head. Optionally, the ball head of the screw 301 and the pressure block 302 are assembled to form a screw-pressure block assembly 40. The ball head of the screw 301 has an internal hexagonal hole 304. At the same time, the end plate 10 of the second-layer module has a long threaded hole, which makes it convenient to screw the screw-pressure block assembly into the end plate from the threaded hole at the bottom of the end plate 10.

[0053] The upper end of the pressure block 302 is connected to the ball head at the bottom of the screw 301 to bear the clamping force provided by the screw 301. The ball head can ensure the relative sliding between the pressure block 302 and the screw 301. When the screw 301 rotates, the pressure block 302 can remain stationary. The ball head can also absorb a certain degree of unevenness of the support surface, making the support force more uniform.

[0054] The lower end of the pressure block 302 is the pressure surface. The pressure block 302 can be moved up and down by adjusting the screw 301 at the top of the second-layer module. After adjustment, the lower end of the pressure block 302 contacts the fixed support surface provided by the end plate 10 of the first-layer module, which plays a supporting role. When the second-layer module has sufficient support in the vertical direction, the design of additional modules and mutual fixing mechanisms can be appropriately simplified, which is conducive to saving costs.

[0055] After the lower pressure surface of the pressure block 302 is adjusted to the correct position, screw the set screw 303 into the screw hole above the end plate 10 of the second-layer module. The set screw 303 can lock the position of the lower pressure surface, so that the screw will not rotate on its own after being subjected to vibration and pressure, ensuring that each support point is on the same horizontal plane. Figure 6 This is a schematic diagram of the set screw structure. In a specific embodiment of this application, the set screw 303 is a standard part, such as a stainless steel concave-end machine set screw. The set screw 303 has an internal hexagonal hole at the upper end for easy screwing in, and the lower end face is flat. Figure 3 As shown, after the pressure block 302 is adjusted into place, the set screw 303 is screwed into the threaded hole above the end plate 10 so that the lower end face of the set screw 303 is in close contact with the upper end face of the screw 301, thereby restricting the up and down movement of the screw 301 and achieving the purpose of locking the adjustable pressing device 30.

[0056] The battery pack multi-layer module fixing structure described in this application improves the dimensional accuracy and stability of the battery pack stacking module by adding an adjustable pressing device 30 below the end plate of the second-layer module to adjust the height of the support point and ensure that the height of the support point is on the same horizontal plane.

[0057] On the other hand, this application embodiment also provides a battery pack, including a battery module and the aforementioned multi-layer module fixing structure for the battery pack, wherein the multi-layer module fixing structure is used to accommodate the battery module and form a battery pack.

[0058] The battery pack multi-layer module fixing structure and battery pack provided in this application improve the accuracy of the height dimension after module stacking by setting an adjustable pressing device below the end plate of the second-layer module to adjust the height of the support surface, ensuring that the height of the entire support surface is on the same horizontal plane. This solves the problem of unstable or even out-of-tolerance height dimension after stacking. At the same time, it simplifies the assembly steps and tooling design of the module frame, avoids the possibility of machining to unify the height of the support surface after the module frame is assembled, improves production efficiency, and saves production costs. Moreover, this solution does not have any process feasibility issues in solving the problem, does not significantly change the battery pack stacking module structure, has a very obvious effect, and is simple and easy to implement.

[0059] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack multi-layer module fixing structure, characterized in that, It includes at least one layer of modules and two layers of modules stacked on top of each other, with the two layers of modules stacked on top of the first layer of modules. Both the first-layer module and the second-layer module include an end plate (10) and a side plate (20). The end plate includes a front end plate (101), a middle end plate (102), and a rear end plate (103). The side panel (20) includes a left side panel (201) and a right side panel (202); The end plate (10) is located between the left side plate (201) and the right side plate (202) and the end plate (10) is perpendicular to the side plate (20); The front end plate (101) and the rear end plate (103) are respectively connected to the two ends of the left side plate (201) and the right side plate (202); The middle plate (102) is connected to the middle of the left side plate (201) and the right side plate (202); An adjustable pressing device (30) is provided below the end plate (20) of the two-layer module. The end plate (10) is provided with a long threaded hole. The adjustable pressing device includes a screw (301), a pressure block (302) and a set screw (303). The bottom of the screw (301) is provided with a ball head. The upper end of the pressure block (302) is connected and assembled with the ball head.

2. The battery pack multi-layer module fixing structure according to claim 1, characterized in that, The upper surfaces of the front end plate (101), the middle end plate (102), and the rear end plate (103) of the first-layer module provide two fixed support surfaces for each of the second-layer modules.

3. The battery pack multi-layer module fixing structure according to claim 2, characterized in that, Each of the front end plate (101), the middle end plate (102), and the rear end plate (103) of the two-layer module is provided with an adjustable pressing device (30) at its lower end.

4. The battery pack multi-layer module fixing structure according to claim 3, characterized in that, The adjustable pressing devices (30) are arranged alternately on both sides of the end plate (10).

5. The battery pack multi-layer module fixing structure according to claim 3, characterized in that, The end plate (10) of the two-layer module has two fixed support surfaces on its upper end face.

6. The battery pack multi-layer module fixing structure according to claim 5, characterized in that, The lower end face of the end plate (10) of the two-layer module is in contact with the upper end face of the end plate (10) of the one-layer module.

7. The battery pack multi-layer module fixing structure according to claim 6, characterized in that, The side plate (20) of the first-layer module is provided with a bracket (21) near each end plate (10). The bracket (21) has a through hole. The front end plate (101), the middle end plate (102), and the rear end plate (103) of the second-layer module have lateral threaded holes at their bottoms. The through holes and the lateral threaded holes are connected by bolts.

8. The battery pack multi-layer module fixing structure according to claim 1, characterized in that, The set screw (303) is connected to the top of the screw (301) and is used to lock the position of the pressure block (302).

9. A battery pack, characterized in that, The battery pack includes a battery module and a multi-layer module fixing structure as described in any one of claims 1-8, wherein the multi-layer module fixing structure is used to accommodate the battery module and form a battery pack.

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