Battery soft package large module

Abstract

The utility model relates to a kind of battery soft package big module, including shell, cold plate, battery core, cooling module and protection mechanism, the cold plate side is equipped with multiple battery cores, the cooling module is located cold plate side, for the cooling of multiple battery cores, the shell is fixed with welding between cold plate, the protection mechanism is installed in shell inner wall, for protecting battery core, protection mechanism is equipped between shell and battery, protection mechanism middle guard plate is the hardness moderate adhesive layer, can be deformed, adhesive strip is equipped between guard plate and battery core, battery core contact portion is soft, and multiple deformable support layers are equipped between guard plate and shell, support, and rubber sleeve is located between shell and guard plate, multiple holes are equipped in sleeve, to realize sleeve deformation after receiving extrusion, energy absorption, protect battery core, wherein, protection mechanism is located between two fixed frame settings.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, specifically to a large soft-pack battery module. Background Technology

[0002] In new energy vehicles, there is a modular battery pack as the core power source of the electric vehicle. The battery cells are usually directly stacked in the cavity formed by the cold plate and the outer shell. The positioning is achieved only by the rigid fixation of the cold plate or the outer shell. If the battery shell is subjected to external impact and deforms, it is easy to squeeze the battery cells and damage them.

[0003] In existing structures, the battery cell and the outer casing are mostly in rigid contact. The solution is to increase the thickness of the outer casing or add internal support components. However, these support components are mostly made of metal and are in direct contact with the battery cell. They cannot buffer stress and may scratch the surface of the battery cell due to differences in material hardness. When subjected to external impact, the outer membrane of the battery cell is easily damaged, which may lead to risks such as leakage and short circuit. Therefore, we need to provide a large soft-pack battery module. Utility Model Content

[0004] The purpose of this utility model is to provide a large soft-pack battery module with a protective mechanism on the inner wall of the outer shell. The protective mechanism is located between the outer shell and the battery cell to protect the battery cell and has a buffering effect, reducing wear or damage to the outer film of the battery cell caused by rigid contact, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a large soft-pack battery module, comprising:

[0006] The device comprises a housing, a cold plate, battery cells, a cooling module, and a protection mechanism. Multiple battery cells are arranged on one side of the cold plate. The cooling module is located on one side of the cold plate and is used to cool the multiple battery cells. The multiple battery cells are fixedly installed together by a module fixing mechanism. The housing is welded to the cold plate. The protection mechanism is installed between the inner wall of the housing and the module fixing mechanism to protect the battery cells.

[0007] The protective mechanism includes a protective plate, a support layer, and a buffer. There are three protective plates, which are located on the inner side wall of the outer shell. Multiple support layers are provided between the protective plate and the inner side wall of the outer shell, and the buffer is located between the protective plate and the inner side wall of the outer shell. The outer shell is C-shaped and fixedly connected to the cold plate. The top of the outer shell is provided with two circular connection ends for connecting to external equipment.

[0008] Preferably, the buffer includes a sleeve and holes, the sleeve is fixed between the protective plate and the inner wall of the outer shell, and the sleeve is provided with multiple holes.

[0009] Preferably, the sleeve is a silicone sleeve and the support layer is a deformable fireproof adhesive layer.

[0010] Preferably, the cooling module includes a single-sided water-cooled plate and an external connecting pipe. The external connecting pipe is installed on one side of the cooling plate. Multiple single-sided water-cooled plates are provided and located between adjacent battery cells. All of the multiple single-sided water-cooled plates are connected to the external connecting pipe, and the external connecting pipe is connected to an external liquid supply device.

[0011] Preferably, two fixing brackets are fixedly installed on the surface of the cold plate, and the two fixing brackets are used to fix multiple battery cells.

[0012] Preferably, a columnar adhesive strip is fixedly installed on the surface of the protective plate near the battery cell.

[0013] Preferably, the inner wall of the outer shell is integrally formed with a guide strip, which is used for guiding the installation of the cold plate.

[0014] Preferably, the module is fixed inside the housing by multiple brackets.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This utility model has a protective mechanism on the inner wall of the outer shell, which is located between the outer shell and the battery cell. The protective mechanism protects the battery cell and has a buffering effect, reducing wear or damage to the outer membrane of the battery cell caused by rigid contact, reducing the risk of leakage and short circuit. The buffer can deform to absorb energy, and the support layer is made of deformable fireproof adhesive layer, which takes into account both buffering and structural stability. It does not affect the welding and fixing of the outer shell and the cold plate, and can alleviate the impact of external forces such as vehicle vibration and impact on the battery cell. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0018] Figure 2 This is an exploded perspective view of the structure of this utility model;

[0019] Figure 3 This is a perspective view of the cooling module of this utility model;

[0020] Figure 4 This is a front view of the cold-rolled steel plate of this utility model;

[0021] Figure 5 This is a three-dimensional schematic diagram of the protective mechanism of this utility model;

[0022] Figure 6 The structure of this utility model Figure 5 Enlarged view of a portion of point A in the middle;

[0023] Figure 7 This is a partial view of the module's intermediate fixing structure of this utility model;

[0024] Figure 8 This is an overall cross-sectional view of the module middle fixing structure of this utility model.

[0025] In the diagram: 1. Outer shell; 2. Cold plate; 3. Battery cell; 4. Cooling module; 41. Single-sided water-cooled plate; 42. External pipe; 5. Protection mechanism; 51. Protective plate; 52. Support layer; 53. Buffer; 531. Sleeve; 532. Hole; 6. Fixing frame; 7. Adhesive strip; 8. Guide strip; 9. Circular connecting end. Detailed Implementation

[0026] 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.

[0027] Please see Figure 1-6 This utility model provides a technical solution: a large battery soft-pack module, comprising:

[0028] The package includes a housing 1, a cold plate 2, battery cells 3, a cooling module 4, and a protection mechanism 5. Multiple battery cells 3 are provided on one side of the cold plate 2. The cooling module 4 is located on one side of the cold plate 2 and is used to cool the multiple battery cells 3. The multiple battery cells 3 are fixedly installed together by a module fixing mechanism. The housing 1 is welded and fixed to the cold plate 2. The protection mechanism 5 is installed between the inner wall of the housing 1 and the module fixing mechanism to protect the battery cells 3.

[0029] The protective mechanism 5 includes a protective plate 51, a support layer 52, and a buffer 53. There are three protective plates 51, which are located on the inner side wall of the outer shell 1. Multiple support layers 52 are provided between the protective plate 51 and the inner side wall of the outer shell 1, and the buffer 53 is located between the protective plate 51 and the inner wall of the outer shell 1. The outer shell 1 is C-shaped and fixedly connected to the cold plate 2. The top of the outer shell 1 is provided with two circular connection ends 9 for connecting to external equipment.

[0030] Specifically, a protective mechanism 5 is provided on the inner wall of the outer shell 1. The protective mechanism 5 is located between the outer shell 1 and the battery cell 3 to protect the battery cell 3. It has a buffering effect, reduces wear or damage to the outer membrane of the battery cell caused by rigid contact, and reduces the risk of leakage and short circuit. The buffer 53 can deform to absorb energy. The support layer 52 adopts a deformable fireproof adhesive layer, which takes into account both buffering and structural stability. It does not affect the welding and fixing of the outer shell 1 and the cold plate 2, and can alleviate the impact of vehicle vibration, impact and other external forces on the battery cell 3.

[0031] In this application, multiple battery cells are combined into a module. The module is connected to the outer shell through a bracket. The whole package has high rigidity. After installation in the whole package, each module achieves dual-sided cooling, improving cooling efficiency. When installing the module, the rear module is installed. After the hole is aligned, the bolts are fixed with the cold plate side facing the rear. Glue is applied to the side of the module's cold plate, and the height of the glue is controlled to be ≤3mm. When placing the module, the gap between it and the previously placed module is ≥4mm. After placement, the module is pushed back to the fixing hole for fixing. The frontmost module is installed. Before installation, the other movable single-sided water-cooling plate is pre-attached to the module.

[0032] in, Figure 7 The module is fixed in the middle of the structure, and the module is connected to the outer shell through a bracket. The overall package has high rigidity and strength. Figure 8 The image shows a cross-sectional view of the outer casing 1. Multiple battery cells 3 are fixedly installed by brackets to ensure a more secure installation of the battery cells 3.

[0033] The buffer 53 includes a sleeve 531 and holes 532. The sleeve 531 is fixed between the protective plate 51 and the inner wall of the outer shell 1, and the sleeve 531 is provided with multiple holes 532.

[0034] Furthermore, the holes 532 of the sleeve 531 are arranged in a honeycomb array. When the outer shell 1 is impacted, the honeycomb holes 532 deform to absorb the impact force. The cooperation between the holes 532 and the silicone allows the buffer 53 to not only adapt to the gap between the protective plate 51 and the outer shell 1, but also to form a stepped buffer with the deformation of the support layer 52. First, the holes 532 collapse, and then the support layer 52 is compressed, overcoming the defect of insufficient buffering capacity of a single hole structure. Since the protection mechanism 5 is installed between the inner wall of the outer shell 1 and the module fixing mechanism, it will not directly apply the impact force to the battery cell 3. By grading energy absorption, the risk of the outer shell 1 deforming and squeezing the battery cell 3 is reduced, and the stability of the impact protection is improved.

[0035] The sleeve 531 is a silicone sleeve, and the support layer 52 is a deformable fireproof adhesive layer;

[0036] It is worth noting that the silicone tube is made of high-temperature resistant silicone, with a temperature range of -40℃ to 150℃; the fireproof adhesive layer is an organosilicon gel layer with added aluminum hydroxide flame retardant, with a thickness of 2-3mm. It is bonded to the protective plate 51 and the inner wall of the outer shell 1 through room temperature vulcanization. After curing, it forms an elastic connection that can be stretched by 10%-15%. The high temperature resistance of the silicone tube matches the flame retardancy of the fireproof adhesive layer, maintaining the buffering performance under the high temperature conditions of the battery cell 3. Moreover, the elasticity of the fireproof adhesive layer can help the silicone tube to return to its original position, solving the problem that traditional buffer materials are not resistant to high temperatures and are prone to failure when exposed to fire. At the same time, it takes into account both buffering and fireproof functions, adapting to the complex temperature environment of new energy vehicles.

[0037] The cooling module 4 includes a single-sided water-cooled plate 41 and an external pipe 42. The external pipe 42 is installed on one side of the cooling plate 2. Multiple single-sided water-cooled plates 41 are provided and located between adjacent battery cells 3. Multiple single-sided water-cooled plates 41 are connected to the external pipe 42, and the external pipe 42 is connected to an external liquid supply device.

[0038] It is worth noting that the contact edge between the single-sided water-cooled plate 41 and the outer shell 1 is sealed by laser welding; a heat-resistant sealing ring is fitted at the connection between the outer pipe 42 and the single-sided water-cooled plate 41. The sealing ring is made of fluororubber and is sealed by the tightening force of the thread of the outer pipe 42. Laser welding enhances the structural strength, while the fluororubber sealing ring compensates for any micro-gaps that may exist in the welding, prevents leakage of the cooling medium, improves the reliability of the water cooling system, and ensures the heat dissipation efficiency of the dual-sided cooling structure.

[0039] Two mounting brackets 6 are fixedly installed on the surface of the cold plate 2. The two mounting brackets 6 are used to fix multiple battery cells 3.

[0040] Specifically, the fixing frame 6 is a C-shaped metal bracket, which is rigidly connected to the cold plate 2 by bolts. A 0.5mm thick nitrile rubber pad is pasted on the side of the fixing frame 6 facing the battery cell 3. The surface of the rubber pad has a wavy texture. When the battery cell 3 expands, the rubber pad compensates for the deformation space by compressing itself, and the wavy texture increases the friction with the battery cell 3 to prevent the battery cell 3 from sliding laterally. The rubber pad of the fixing frame 6 buffers the lateral force and forms a three-dimensional protection with the longitudinal buffer of the protection mechanism 5 to avoid excessive displacement of the battery cell 3 in the three-dimensional direction.

[0041] A columnar adhesive strip 7 is fixedly installed on the surface of the protective plate 51 near the battery cell 3;

[0042] The adhesive strip 7 is a cylindrical silicone strip, which is integrally molded with the protective plate 51. The end of the adhesive strip 7 away from the protective plate 51 is hemispherical, and the hemispherical surface is covered with a 0.1mm thick polytetrafluoroethylene film. The hemispherical end reduces the contact area with the battery cell 3, reducing the risk of friction damage. The low coefficient of friction of the polytetrafluoroethylene film can reduce the relative wear when the battery cell 3 expands and contracts, avoiding scratches on the outer film caused by direct contact between the protective plate 51 and the battery cell 3. At the same time, the elasticity of the silicone strip further buffers local pressure.

[0043] The inner wall of the outer shell 1 is integrally formed with a guide strip 8, which is used for guiding the installation of the cold plate 2;

[0044] The guide bar 8 is a long, raised strip. During assembly, the cold plate 2 fits against the guide bar 8, overcoming the defects of traditional guide structures that are prone to jamming and inaccurate positioning, improving the welding quality between the outer shell 1 and the cold plate 2, and ensuring the overall rigidity of the module.

[0045] The module is fixed inside the outer casing 1 by multiple brackets;

[0046] Multiple battery cells are combined into a module. The module is connected to the outer shell through a bracket. The whole package has high rigidity. After installation, each module can achieve dual-sided cooling, which improves cooling efficiency. When installing the module, the tail module is installed and the bolts are fixed after the hole positions are aligned.

[0047] The battery cell 3 and the single-sided water-cooled plate 41 involved in this application are both implemented using existing mature technologies, which are conventional technical means in this field, so their specific working processes will not be described in detail.

[0048] This device uses an integrated stamped shell 1 as the basic frame. The shell 1 is rigidly connected to the cold plate 2 by welding around the perimeter. Combined with the fixed structure in the middle and on both sides of the module, a stable overall module skeleton is formed to resist vibration and deformation. The single-sided water cooling plate 41 is first positioned by snap-fit ​​to the shell 1 and then fixed by welding. This ensures the precise alignment of the single-sided water cooling plate 41 and the shell 1, and also distributes the stress on the weld, avoiding structural failure caused by a single connection method.

[0049] Each module comes with a single-sided water-cooled plate 41 as a basic cooling unit. When multiple modules are stacked and installed in a specific direction, the single-sided water-cooled plates 41 of adjacent modules cooperate with the outer shell to form a double-sided cooling structure. By increasing the cooling area, the heat dissipation efficiency is improved. The single-sided water-cooled plate 41 and the cold plate 2 are bonded with glue to ensure the sealing of the cooling medium circulation path and achieve directional heat dissipation of the battery cell 3.

[0050] A protective mechanism 5 is provided between the outer casing 1 and the battery. The protective plate 51 in the protective mechanism 5 is a rubber plate with moderate hardness, which can undergo a certain deformation. A rubber strip 7 is provided between the protective plate 51 and the battery core 3 to soften the contact part of the battery core 3. Multiple deformable support layers 52 are provided between the protective plate 51 and the outer casing 1 for support. A rubber sleeve 531 is provided between the outer casing 1 and the protective plate 51. Multiple holes 532 are provided in the sleeve 531 so that the sleeve 531 deforms when it is squeezed to absorb energy and protect the battery core 3. The protective mechanism 5 is located between two fixed frames 6.

[0051] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large battery pouch module, characterized in that, include: The package includes a housing (1), a cold plate (2), battery cells (3), a cooling module (4), and a protection mechanism (5). The cold plate (2) has multiple battery cells (3) on one side. The cooling module (4) is located on one side of the cold plate (2) and is used to cool the multiple battery cells (3). The multiple battery cells (3) are fixedly installed together by a module fixing mechanism. The housing (1) is welded to the cold plate (2). The protection mechanism (5) is installed between the inner wall of the housing (1) and the module fixing mechanism to protect the battery cells (3). The protective mechanism (5) includes a protective plate (51), a support layer (52), and a buffer (53). There are three protective plates (51), which are located on the inner wall of the outer shell (1). Multiple support layers (52) are provided between the protective plate (51) and the inner wall of the outer shell (1). The buffer (53) is located between the protective plate (51) and the inner wall of the outer shell (1). The outer shell (1) is C-shaped and fixedly connected to the cold plate (2). The top of the outer shell (1) is provided with two circular connection ends (9) for connecting with external equipment.

2. The battery soft-pack large module according to claim 1, characterized in that: The buffer (53) includes a sleeve (531) and holes (532). The sleeve (531) is fixed between the protective plate (51) and the inner wall of the outer shell (1), and the sleeve (531) is provided with multiple holes (532).

3. A battery soft-pack large module according to claim 2, characterized in that: The sleeve (531) is a silicone sleeve, and the support layer (52) is a deformable fireproof adhesive layer.

4. A battery soft-pack large module according to claim 1, characterized in that: The cooling module (4) includes a single-sided water-cooled plate (41) and an external pipe (42). The external pipe (42) is installed on one side of the cooling plate (2). There are multiple single-sided water-cooled plates (41) and they are located between adjacent battery cells (3). All of the single-sided water-cooled plates (41) are connected to the external pipe (42). The external pipe (42) is connected to an external liquid supply device.

5. A battery soft-pack large module according to claim 1, characterized in that: Two fixing brackets (6) are fixedly installed on the surface of the cold plate (2), and the two fixing brackets (6) are used to fix multiple battery cells (3).

6. A battery soft-pack large module according to claim 1, characterized in that: A columnar adhesive strip (7) is fixedly installed on the surface of the protective plate (51) near the battery cell (3).

7. A battery soft-pack large module according to claim 1, characterized in that: The inner wall of the outer shell (1) is integrally formed with a guide strip (8), which is used for guiding the installation of the cold plate (2).

8. A battery soft-pack large module according to claim 1, characterized in that: The module is fixed inside the outer shell (1) by multiple brackets.

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