Thermal insulation pad and battery pack module

Abstract

The utility model relates to a kind of thermal insulation pad and battery pack module, thermal insulation pad includes main body thermal insulation pad, the width of main body thermal insulation pad is less than the width of battery cell, height is consistent with the height of battery cell;The bottom and both sides of main body thermal insulation pad are equipped with elastic frame, among them, the length of the elastic frame of bottom is consistent with the width of battery cell.The battery pack module includes end plate, insulating sheet, battery cell, thermal insulation pad, steel band and structural adhesive.The elastic frame of the thermal insulation pad of the utility model does not contact battery cell shell welding heat affected zone, avoid the stress of elastic material in the welding weak area of battery cell shell.The structural adhesive position of the utility model is higher, overflow to module side, enter between the large surface of battery cell, improve the rigidity between module and box, also enhance the rigidity of module itself.

Description

Technical Field

[0001] This utility model relates to the field of battery pack structure technology, specifically to a heat insulation pad and a battery pack module. Background Technology

[0002] In battery pack modules, highly elastic foam is needed between the cells to absorb the thickness tolerances and expansion forces of the cells. However, materials with good thermal insulation have poor elasticity, and compression of the thermal insulation material significantly affects its insulation performance. Therefore, existing solutions generally use foam with good compressibility but poor thermal insulation as the lining, with a material with good thermal insulation filling the middle. However, this "U"-shaped foam lining compresses back into the relatively vulnerable heat-affected zone of the cell top cover. When the module vibrates, the continuous pressure on the heat-affected zone of the cell top cover may cause the cell casing to crack.

[0003] Patent document CN211208505U discloses a heat insulation pad and a battery module. The heat insulation pad has a notch on its edge, which cooperates with an external structure to form an adhesive groove for accommodating adhesive. Therefore, by setting a notch on the circumferential edge of the heat insulation pad, multiple battery cells can be effectively bonded, ensuring the reliability of the cell bonding and preventing adhesive overflow contamination. However, the elastic frame in this solution is cut as a whole and hollowed out in the middle, resulting in significant material waste. Furthermore, the elastic frame contacts the heat-affected zone of the battery cell casing during welding, which can easily lead to battery cell casing cracking. In addition, the structural adhesive at the bottom of the module cannot penetrate the large surface of the battery cells to increase the module's rigidity. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a heat insulation pad and a battery pack module to solve the aforementioned problems.

[0005] This utility model provides the following technical solution:

[0006] A heat insulation pad includes a main heat insulation pad, the width of which is less than the width of the battery cell and the height of which is the same as the height of the battery cell; the bottom and both sides of the main heat insulation pad are provided with elastic frames, wherein the length of the elastic frames on both sides is less than the height of the battery cell.

[0007] Furthermore, the length of the bottom elastic frame is consistent with the width of the battery cell, and the length of the elastic frames on both sides is lower than the welding area between the aluminum shell of the battery cell and the top cover of the battery cell.

[0008] Furthermore, the thickness of the elastic frame is greater than the thickness of the main heat insulation pad, the main heat insulation pad is made of a heat insulation material with low thermal conductivity, and the elastic frame is made of a highly elastic material.

[0009] A battery pack module includes an end plate, an insulating sheet, battery cells, a heat insulation pad as described in any of the foregoing technical solutions, a steel strip, and structural adhesive, wherein the heat insulation pad is located between the battery cells, and the structural adhesive is included on the bottom and sides of the battery pack module, and the structural adhesive can overflow from the width direction of the battery pack module into the large surface area between the battery cells.

[0010] Furthermore, the battery cell includes an aluminum shell, a core, an electrolyte, and a top cover, with the top cover located on top of the battery cell and the electrolyte filling the interior of the aluminum shell and surrounding the core.

[0011] This utility model has the following beneficial technical effects:

[0012] This utility model discloses a heat insulation pad and battery pack module structure. It uses three elastic strips to form a frame, which reduces the waste of elastic frame material. The elastic frame does not contact the heat-affected zone of the cell shell welding, avoiding the elastic material being stressed in the weak welding area of ​​the cell shell, thereby preventing the cell shell from cracking.

[0013] The structural adhesive of this invention is positioned high, overflowing onto the side of the module and entering between the large surfaces of the battery cells, which improves the rigidity between the module and the housing, and also enhances the rigidity of the module itself. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall module structure of this utility model;

[0015] Figure 2 This is an exploded view of the module structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the heat insulation pad of this utility model;

[0017] Figure 4 This is a top view of the heat insulation pad of this utility model;

[0018] Figure 5 This is a front view of the heat insulation pad of this utility model;

[0019] Figure 6 This is a schematic diagram showing the interaction between the heat insulation pad and the module of this utility model;

[0020] Figure 7 This is a schematic diagram of the heat insulation pad and structural adhesive of this utility model.

[0021] Figure 8 This is a top view of the cross-section of the battery cell and a schematic diagram of the fit between the battery cell casing and the outer structural adhesive.

[0022] Figure 9 This is a front cross-sectional view of the battery cell of this utility model.

[0023] The attached figures are labeled as follows:

[0024] 1. End plate; 2. Insulating sheet; 3. Battery cell; 31. Aluminum shell; 32. Core; 33. Electrolyte; 34. Top cover; 4. Heat insulation pad; 41. Main heat insulation pad; 42. Elastic frames on both sides; 43. Bottom elastic frame; 5. Steel strip; 6. Structural adhesive. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1

[0027] A heat insulation pad 4 includes a main heat insulation pad 41, the width of which is less than the width of the battery cell 3, and the height is the same as the height of the battery cell 3; the bottom and sides of the main heat insulation pad 4 are provided with elastic frames, wherein the length of the elastic frames 42 on both sides is less than the height of the battery cell. In this embodiment, the length of the elastic frames 42 on both sides is lower than the welding area between the aluminum shell 31 of the battery cell and the top cover 34 of the battery cell, so as to avoid the elastic material being stressed in the weak welding area of ​​the battery cell shell. The elastic frames do not contact the welding heat-affected zone of the battery cell shell, so as not to cause the battery cell shell to crack.

[0028] In this embodiment, the length of the bottom elastic frame 43 is greater than the width of the main heat insulation pad 41 and is consistent with the width of the battery cell, which can realize the center alignment of the heat insulation pad 4 when the battery pack modules are stacked.

[0029] In this embodiment, the elastic frame of the heat insulation pad 4 consists of three elastic materials, rather than being cut as a whole and hollowed out in the middle, thus avoiding waste of raw materials.

[0030] The thickness of the elastic frame is greater than the thickness of the main heat insulation pad 41. During use, the battery cells will thermally expand due to temperature changes. A thicker elastic material can better accommodate this expansion, providing sufficient buffer space and preventing the battery cells 3 from squeezing against each other. This not only protects the battery cells 3 but also extends their service life.

[0031] To ensure the heat insulation effect of the heat insulation pad 4, in this embodiment, the main heat insulation pad 41 is made of a heat insulation material with low thermal conductivity, and the elastic frame is made of a highly elastic material.

[0032] Example 2

[0033] A battery pack module includes an end plate 1, an insulating sheet 2, battery cells 3, a heat insulation pad 4 as described in the aforementioned embodiment 1, a steel strip 5, and structural adhesive 6. The heat insulation pad 4 is located between the battery cells 3. The bottom and sides of the battery pack module are covered with the structural adhesive 6. The structural adhesive 6 can overflow from the width direction of the battery pack module into the large surface area between the battery cells 3, thereby strengthening the rigidity between the module and the housing, and also enhancing the rigidity of the module itself.

[0034] The battery cell 3 includes an aluminum shell 31, a core 32, an electrolyte 33, and a top cover 34. The top cover 34 is located on top of the battery cell 3, and the electrolyte 33 is filled inside the aluminum shell 31 and surrounds the core 32.

[0035] In this embodiment, after the battery pack modules are assembled, there is a heat insulation pad 4 between the battery cells 3. A portion of the structural adhesive 6 that enters between the battery cells 3 is blocked by the elastic frame of the heat insulation pad 4 and does not enter the main heat insulation pad 41.

[0036] In traditional cases, after the cell 3 expands at the end of its lifespan, lithium plating occurs due to the localized stress of the structural adhesive 6 on the core 32. However, in this embodiment, the structural adhesive 6 acts on the aluminum shell 31 through the elastic frames 42 on both sides of the heat insulation pad, and the other end of the aluminum shell 31 acts on the electrolyte 33 area, not directly on the core 32. Therefore, lithium plating can be prevented.

[0037] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A heat insulation pad, comprising a main heat insulation pad, characterized in that, The width of the main heat insulation pad is smaller than the width of the battery cell, and the height is the same as the height of the battery cell; the bottom and both sides of the main heat insulation pad are provided with elastic frames, wherein the length of the elastic frames on both sides is smaller than the height of the battery cell.

2. The heat insulation pad according to claim 1, characterized in that, The length of the bottom elastic frame is the same as the width of the battery cell.

3. The heat insulation pad according to claim 2, characterized in that, The length of the elastic frames on both sides is lower than the welding area between the aluminum shell of the battery cell and the top cover of the battery cell.

4. The heat insulation pad according to claim 3, characterized in that, The thickness of the elastic frame is greater than the thickness of the main heat insulation pad.

5. A heat insulation pad according to claim 4, characterized in that, The main heat insulation pad is made of a heat insulation material with low thermal conductivity, and the elastic frame is made of a highly elastic material.

6. A battery pack module, characterized in that, The battery pack module includes an end plate, an insulating sheet, a battery cell, a heat insulation pad as described in any one of claims 1-3, a steel strip, and structural adhesive, wherein the heat insulation pad is located between the battery cells, and the bottom and sides of the battery pack module include the structural adhesive, which can overflow from the width direction of the battery pack module into the large surface area between the battery cells.

7. A battery pack module according to claim 6, characterized in that, The battery cell includes an aluminum shell, a core, an electrolyte, and a top cover; the top cover is located on top of the battery cell, and the electrolyte fills the interior of the aluminum shell and surrounds the core.

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