A square power battery module pressure and size consistency control device

Abstract

The utility model is suitable for electric automobile power battery pack design and manufacturing technical field provides a kind of square power battery module pressure and size consistency control device, comprising: thin gasket and the thin gasket automatic filling device for installing thin gasket to battery module end part, at least one piece is provided to thin gasket;And the pressure device for the battery module pressure combination, the utility model discloses by adding thin gasket, the same pressure and size can be kept between each battery module, to ensure production consistency;By adding thin gasket, the same pressure and size are kept between each battery module, can be convenient for each module installation positioning, to improve assembly production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle power battery pack design and manufacturing technology, specifically a pressure and size consistency control device for a square power battery module. Background Technology

[0002] Currently, pure electric and hybrid vehicles commonly use power batteries as their power source, and the most widely used type is the module composed of square batteries. Existing square power battery modules generally use elastic pads between battery cells, and then apply a certain pressure externally, while the battery cells are stacked together by adhesive or bolts (or straps).

[0003] Applying a certain pressure to a module composed of square batteries is an effective way to ensure that the battery pack is not affected by the vibration and friction of individual battery cells and the expansion and contraction caused by charging and discharging during vehicle operation. Moreover, ensuring the consistency of pressure and size can effectively improve battery life.

[0004] Existing square battery module manufacturing technologies suffer from cumulative manufacturing errors in the thickness direction of individual battery cells. When applying the same pressure to the modules, there's a high probability of inconsistent module dimensions or inconsistent pressure even when applying the same pressure. This results in significant errors in the pressure and dimensions of the battery modules within each battery pack, making it difficult to guarantee manufacturing consistency. Consequently, this leads to inconsistencies in assembly and performance lifespan, significantly impacting assembly efficiency and battery lifespan. Therefore, there is an urgent need to provide a pressure and dimension consistency control device for square power battery modules to overcome the shortcomings in current practical applications. Utility Model Content

[0005] The purpose of this invention is to provide a pressure and size consistency control device for square power battery modules, which aims to solve the problems mentioned in the background art.

[0006] This utility model is implemented as follows: a pressure and size consistency control device for a square power battery module, comprising:

[0007] Thin gasket and an automatic gasket loading device for mounting the thin gasket to the end of a battery module, wherein at least one thin gasket is provided;

[0008] And a pressure device for pressing the battery modules together.

[0009] As a further embodiment of this utility model: the battery module includes a battery cell, a spring pad, and an end plate. The battery cell and the spring pad are arranged alternately and tightly to form a battery cell-spring pad assembly. The end plate is disposed on both sides of the battery cell-spring pad assembly.

[0010] As a further embodiment of this utility model, several battery cells and spring pads are provided.

[0011] As a further embodiment of this invention: the thin gasket is filled in the gap between the battery cell and the end plate.

[0012] As a further embodiment of this utility model: the end plate is provided with a groove adapted to the battery cell, and the end plate is provided with a pressing plane that cooperates with the pressure device.

[0013] As a further embodiment of this utility model: one end of the pressure device is a stationary end, which cooperates with the end plate on one side of the battery module, and the other end of the pressure device is a movable end, which is driven by hydraulic, stepper motor or servo motor, and cooperates with the end plate on the other side of the battery module to realize the pressurization action.

[0014] As a further aspect of this invention, the thin gasket is made of insulating material.

[0015] As a further embodiment of this invention, the insulating material is an epoxy resin sheet.

[0016] As a further aspect of this utility model, the thickness of the thin pad is the maximum allowable error value in the manufacturing dimensions of the battery module.

[0017] As a further aspect of this utility model, the thin gasket has a preset stiffness.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. By adding thin gaskets, each battery module can maintain the same pressure and dimensions, thus ensuring production consistency;

[0020] 2. By adding thin gaskets, the same pressure and dimensions are maintained between each battery module, which facilitates the installation and positioning of each module, thereby improving assembly production efficiency;

[0021] 3. Maintaining the same pressure and size among battery modules can effectively ensure the consistency of battery performance and lifespan, avoid the weakest link effect, and thus improve the service life of new energy vehicles;

[0022] 4. This utility model is applicable to all square batteries, including soft-pack and hard-shell batteries, and square batteries are currently the mainstream in the new energy vehicle or energy storage industry, so it has a wide range of applications. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in 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 utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the assembly of this utility model.

[0025] Figure 2 This is an exploded view of the present invention.

[0026] Figure 3 This is a top view of the present invention.

[0027] Figure 4 for Figure 3 Cross-sectional view at point AA.

[0028] Figure 5 for Figure 5 Enlarged view of point B in the middle.

[0029] Figure 6 This is a schematic diagram of the structure of this utility model in use.

[0030] In the attached diagram: 1-Battery cell, 2-Spring pad, 3-End plate, 4-Pressure device, 5-Thin pad, 6-Thin pad automatic filling device, 7-Battery pack upper shell, 8-Battery module, 9-Battery module fixing strap, 10-Battery pack lower shell. Detailed Implementation

[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0035] Please see Figures 1-6 This utility model provides a pressure and size consistency control device for a square power battery module, the pressure and size consistency control device for the square power battery module includes:

[0036] Thin pad 5 and thin pad automatic filling device 6 for installing thin pad 5 to the end of battery module 8, wherein at least one thin pad 5 is provided;

[0037] And a pressure device 4 for pressing the battery module 8 together;

[0038] The battery module 8 includes a battery cell 1, a spring pad 2, and an end plate 3. The battery cell 1 and the spring pad 2 are arranged alternately and tightly to form a battery cell-spring pad assembly. The end plate 3 is disposed on both sides of the battery cell-spring pad assembly.

[0039] The battery cell 1 and the spring pad 2 are each provided with a plurality of them;

[0040] The thin gasket 5 fills the gap between the battery cell 1 and the end plate 3.

[0041] In the embodiments of this utility model, the thin pad 5 is designed to be relatively thin. Due to the manufacturing error of the battery cell 1 and the spring pad 2, there will be a deviation in the thickness direction after compression, which will cause inconsistencies in the length and pressure of each module. Therefore, the thin pad 5 is placed at the rightmost end of the battery module 8, and the number of thin pads 5 is used to adjust the length and pressure error of the battery module 8. The thin pad automatic filling device 6 is used to automatically add the thin pad 5 into the gap between the battery cell 1 and the end plate 3.

[0042] In one embodiment of this utility model, please refer to Figures 1-6 The end plate 3 is provided with a groove adapted to the battery cell 1, and the end plate 3 is provided with a pressing plane that fits the pressure device 4.

[0043] One end of the pressure device 4 is a stationary end, which cooperates with the end plate 3 on one side of the battery module 8. The other end of the pressure device 4 is a movable end, which is driven by hydraulic pressure, stepper motor or servo motor, and cooperates with the end plate 3 on the other side of the battery module 8 to realize the pressurization action.

[0044] In one embodiment of this utility model, please refer to Figures 1-6 The thin gasket 5 is made of insulating material;

[0045] The insulating material is an epoxy resin sheet, used to prevent the battery surface from coming into contact with the conductor and causing a short circuit.

[0046] The thickness of the thin pad 5 is the maximum allowable error value of the battery module 8 size. When the absolute value of the size error of the battery module 8 is allowed to be within 0.5mm, the thickness of the thin pad 5 is designed to be 0.5mm. The thin pad 5 has a preset stiffness, so that its thickness will not be significantly squeezed when the pressure device 4 applies a preset pressure, so as to ensure thickness accuracy.

[0047] In one embodiment of this utility model, please refer to Figures 1-6 It also includes a fastening structure for fixing the battery module 8, the fastening structure including battery module fixing straps 9, screws or adhesives; after adjusting the size of the battery module 8 to the design size Ls by using the thin shim 5, the fastening structure is used to fix the battery cell 1, spring pad 2, end plate 3 and thin shim 5 into one piece, so as to facilitate installation into the upper housing 7 and lower housing 10 of the battery pack.

[0048] In summary, the working principle of this utility model is as follows:

[0049] (1) First, arrange and attach the battery cell 1 and the spring pad 2 at intervals. Depending on the series and parallel connection (or the required voltage and current of the power battery module 8), there can be multiple battery cells 1 and spring pads 2.

[0050] The spring pad 2 is used to absorb the expansion and contraction of multiple battery cells 1 during charging or discharging. That is, during charging, each battery cell 1 expands, especially in the thickness direction, and during discharging, each battery cell 1 contracts, especially in the thickness direction. In order to maintain a tight fit between the battery cells 1 and avoid mutual displacement between the battery cells 1 during driving, thereby generating friction between them, and also to ensure that the battery cells 1 are tightly fitted together and absorb the dimensional errors of charging expansion and discharging contraction, the addition of the spring pad 2 can effectively avoid the above problems.

[0051] (2) In order to facilitate the application of pressure to the battery module 8 and protect the surface of the battery cell 1 from being squeezed and damaged by the pressure device 4, end plates 3 are added to both sides of the assembly consisting of the battery cell 1 and the spring pad 2. The end plates 3 are designed with grooves suitable for the battery cell 1 and extrusion planes that cooperate with the pressure device 4.

[0052] (3) After the battery cell 1, spring pad 2 and end plate 3 are arranged in sequence, they are placed on a specific working platform with pressure devices 4 on both sides. One end of the pressure device 4 (the left end in this example) is designed to be stationary, and the other end (the right end in this example) is designed to apply a certain pressure to one end of the battery module 8 composed of battery cell 1, spring pad 2 and end plate 3 under the action of hydraulic pressure or stepper motor (or servo motor).

[0053] (4) The battery module 8, consisting of battery cell 1, spring pad 2 and end plate 3, is squeezed by pressure device 4. The pressure applied is the pressure value F designed in advance according to the pressure that the cell can withstand, and this pressure F is maintained for a period of time until F no longer changes significantly.

[0054] Then, use a dimensional measuring tool (or instrument) to measure the length of the battery module 8 under this design pressure F and record it as Lx; compare Lx with the design dimension Ls (the design dimension Ls is pre-designed to be Ls≥Lx, where Ls can be calculated by multiplying the maximum thickness of each battery cell 1 by the number of battery cells 1, plus the thickness of all the spring pads 2, which will be the maximum size of the battery module 8 when the thickness of each battery cell 1 reaches its maximum).

[0055] If Lx = Ls, then there is no need to add a thin gasket 5 between the battery module 8 and the end plate 3, and the size and pressure of the entire battery module 8 are equal to the design value.

[0056] If the battery module 8 dimension Lx is smaller than the design dimension Ls after the pressure device 4 applies the design pressure value F, then a thin gasket 5 needs to be added.

[0057] The number of thin gaskets 5 added is equal to the calculated value of (Ls-Lx) divided by the thickness of the thin gasket, denoted as x. They are automatically filled between the battery cell 1 and the end plate 3 by the thin gasket automatic filling device 6, and then pressed according to the design pressure value F. The current size of the battery module 8 should be equal to Ls within the error allowable range.

[0058] Under certain pressure, within the allowable error range of size, regardless of whether the original size of the battery module 8 is suitable, the same size of the battery module 8 can be achieved by applying the same number of thin pads 5, thereby ensuring the consistency of pressure and size of each battery module 8.

[0059] (5) The thin pad 5 is designed to be thinner. The thickness of each thin pad 5 is the maximum allowable error of the size of the battery module 8. For example, in order to ensure the consistency of the size of each battery module 8, the absolute value of the length dimension error of each battery module 8 is allowed to be within 0.5mm. Therefore, the thin pad 5 should be designed to be 0.5mm thick. When the number of thin pads 5 is obtained by dividing the calculated value of (Ls-Lx) by the thickness of the thin pad, the number of pads is rounded to an integer multiple. Adding this number of thin pads 5 will not cause the battery module 8 to exceed the range of error.

[0060] Secondly, the thin gasket 5 has a certain rigidity to prevent the thickness from being significantly squeezed when pressure is applied, thereby losing the proper thickness accuracy.

[0061] Secondly, the thin pad 5 has a certain degree of insulation (e.g., epoxy resin sheet) to prevent the battery surface from being squeezed by the conductor and short-circuiting.

[0062] (6) The thin pad automatic filling device 6 can be designed to automatically calculate (Ls-Lx) and the number of thin pads 5, and then be designed to automatically add the required thin pads 5 to the gap between the end plate 3 and the battery cell 1.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pressure and dimensional consistency control device for a square power battery module, characterized in that, include: Thin pad (5) and a thin pad automatic filling device (6) for mounting the thin pad (5) to the end of the battery module (8), wherein at least one thin pad (5) is provided; And a pressure device (4) for pressing the battery module (8) together.

2. The square power battery module pressure and size consistency control device according to claim 1, characterized in that, The battery module (8) includes a battery cell (1), a spring pad (2) and an end plate (3). The battery cell (1) and the spring pad (2) are arranged alternately and tightly to form a battery cell-spring pad assembly. The end plate (3) is disposed on both sides of the battery cell-spring pad assembly.

3. The square power battery module pressure and size consistency control device according to claim 2, characterized in that, Both the battery cell (1) and the spring pad (2) are provided with a number of them.

4. The square power battery module pressure and size consistency control device according to claim 2, characterized in that, The thin pad (5) fills the gap between the battery cell (1) and the end plate (3).

5. The square power battery module pressure and size consistency control device according to claim 2, characterized in that, The end plate (3) is provided with a groove adapted to the battery cell (1), and the end plate (3) is provided with a pressing plane that matches the pressure device (4).

6. The square power battery module pressure and size consistency control device according to claim 2, characterized in that, One end of the pressure device (4) is a stationary end, which cooperates with the end plate (3) on one side of the battery module (8). The other end of the pressure device (4) is a movable end, which is driven by hydraulic, stepper motor or servo motor, and cooperates with the end plate (3) on the other side of the battery module (8) to realize the pressurization action.

7. The square power battery module pressure and size consistency control device according to claim 1, characterized in that, The thin gasket (5) is made of insulating material.

8. The square power battery module pressure and size consistency control device according to claim 7, characterized in that, The insulating material is an epoxy resin sheet.

9. The square power battery module pressure and size consistency control device according to claim 1, characterized in that, The thickness of the thin pad (5) is the maximum allowable error value for the manufacturing dimensions of the battery module (8).

10. The square power battery module pressure and size consistency control device according to claim 1, characterized in that, The thin gasket (5) has a preset stiffness.

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