Battery pack structure

Abstract

The invention discloses a battery pack structure, which comprises a battery box body, and the inner side of the battery box body comprises a liquid cooling plate for heat dissipation; the battery cell stacking group is arranged on the inner side of the battery box body, and a heat-conducting structural adhesive for bonding the battery cell stacking group and the battery box body is arranged between the battery cell stacking group and the battery box body; wherein microspheres are mixed on the inner side of the heat-conducting structural adhesive, so that the microspheres dissolve the heat-conducting structural adhesive during maintenance; according to the invention, the easily-soluble shell and the sol agent are arranged, so that the problems that the cell stack group is inconvenient to disassemble and the bonding strength of the heat-conducting structural adhesive to the cell stack group cannot be well reduced when the battery pack breaks down are avoided, and the device can well utilize the existing liquid cooling plate to improve heat so as to break the microspheres, so that the heat-conducting structural adhesive is dissolved, and the battery pack is more convenient to use. And thus, the battery cell stacking group is convenient to disassemble, and the maintenance convenience is improved.

Description

Technical Field

[0001] The present invention specifically relates to a battery pack structure. Background Art

[0002] With the rapid development of new energy vehicles, power batteries tend to be highly integrated. More and more vehicle manufacturers choose the CTP structure, which can simply improve the energy density of the battery pack and reduce the manufacturing process. The CTP structure requires a large amount of glue to fix the battery cells in the box. The selection of the colloid needs to consider both heat conduction and structural strength functions. The system heat conduction ability is limited, which affects the battery life. When a battery fails, due to the inability to disassemble, it is a huge challenge for after-sales maintenance. Therefore, we propose a battery pack structure. Summary of the Invention

[0003] The purpose of the present invention is to provide a battery pack structure to solve the problem that the battery cannot be effectively and quickly disassembled after a failure as mentioned in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A battery pack structure, including:

[0005] A battery box body, the inner side of the battery box body includes a liquid cooling plate for heat dissipation;

[0006] A battery cell stack group is arranged on the inner side of the battery box body, and there is a thermally conductive structural adhesive for bonding the two between the battery cell stack group and the battery box body;

[0007] Wherein, microspheres are mixed inside the thermally conductive structural adhesive to dissolve the thermally conductive structural adhesive by the microspheres during maintenance;

[0008] When the battery pack fails and needs to be repaired, it is convenient to heat the liquid cooling plate to reach the paraffin phase change temperature, release the solubilizer inside the soluble shell, dissolve the thermally conductive structural adhesive, and facilitate the rapid disassembly of the battery.

[0009] Preferably, the thermally conductive structural adhesive includes a soluble shell and a solubilizer, and the solubilizer is arranged inside the soluble shell;

[0010] When the battery pack fails, it is convenient to release the solubilizer to reduce the bonding effect of the thermally conductive structural adhesive.

[0011] Preferably, the solubilizer is a lipid solvent or a ketone solvent;

[0012] It is convenient to better solubilize to reduce the bonding strength of the thermally conductive structural adhesive.

[0013] Preferably, the material of the soluble shell is paraffin, and the diameter of the soluble shell is 10 - 50 μm;

[0014] It is convenient to be heated and dissolved to release the inner substance.

[0015] Preferably, the preparation of the microspheres is one or more of the solvent evaporation method, spray drying method, phase separation method, microfluidic technology, and electrospray method;

[0016] It is convenient to quickly produce the microspheres.

[0017] Preferably, the battery cell stack group includes battery cells and double-sided tape. The battery cells and the double-sided tape are arranged side by side to fix two adjacent battery cells through the double-sided tape;

[0018] It is convenient to quickly connect and fix multiple battery cells.

[0019] Preferably, the battery box body further includes a frame, a bottom guard plate, a cavity, and a rubber pad. The bottom surface of the frame is fixed with the bottom guard plate through bolts, and the liquid cooling plate is located between the frame and the bottom guard plate. The bottom guard plate is connected with the rubber pad through a groove, and a cavity for heat insulation is arranged inside the bottom guard plate;

[0020] It is convenient to block the rupture and deformation of the bottom guard plate and ensure the safety of the battery cell stack group.

[0021] Preferably, the bottom guard plate includes a first guard plate, a second guard plate, a connecting slider, and a connecting bolt. The first guard plate and the second guard plate are arranged side by side, and a connecting slider for sliding connection with the first guard plate is provided on one end surface of the second guard plate. The bottom surface of the first guard plate is connected with a connecting bolt extending into the inside of the connecting slider through a threaded part;

[0022] The detachable design is conducive to later maintenance and replacement, and reduces the maintenance cost.

[0023] Preferably, the cross-section of the connecting slider is "convex" shaped;

[0024] It is convenient to quickly connect the first guard plate and the second guard plate to form a whole.

[0025] Preferably, the material of the rubber pad is silicone rubber;

[0026] It is convenient to have better high-temperature resistance and elastic effects

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] (1) By providing a soluble shell and a solubilizing agent, the present invention avoids the inconvenience of disassembling the battery cell stack group in case of battery pack failure and cannot well reduce the bonding strength of the thermally conductive structural adhesive to the battery cell stack group. This device can make good use of the existing liquid cooling plate to increase the heat to break the microspheres and solubilize the thermally conductive structural adhesive, thereby facilitating the disassembly of the battery cell stack group and improving the convenience of maintenance.

[0029] (2) By providing a bottom guard plate, a cavity and a rubber pad, when an external object collides and squeezes the lower surface of the bottom guard plate, it can prevent the bottom guard plate from directly piercing the stacked battery cell group after it is broken. This device can effectively block and buffer through the rubber pad, improving the safety of the stacked battery cell group. Moreover, the cavity and the rubber pad have good heat insulation effects, which can effectively reduce the direct impact of external high and low temperatures on the stacked battery cell group, reduce the interference of the external environment on the stacked battery cell group, and improve the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of the present invention;

[0031] Figure 2 is a schematic structural diagram of the microspheres of the present invention;

[0032] Figure 3 is a schematic structural diagram of the explosion of the present invention;

[0033] Figure 4 is a schematic structural diagram of the battery box of the present invention;

[0034] Figure 5 is of the present invention Figure 4 schematic cross-sectional structure diagram at A.

[0035] In the figure: 1, stacked battery cell group; 11, battery cell; 12, double-sided adhesive; 2, thermally conductive structural adhesive; 21, soluble housing; 22, solubilizing agent; 3, battery box; 31, frame; 32, liquid cooling plate; 33, bottom guard plate; 331, first guard plate; 332, second guard plate; 333, connecting slider; 334, connecting bolt; 34, cavity; 35, rubber pad. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Please refer to Figures 1 - 5 , the present invention provides a technical solution: a battery pack structure, including:

[0038] A battery box 3, the inner side of the battery box 3 includes a liquid cooling plate 32 for heat dissipation;

[0039] A stacked battery cell group 1, arranged inside the battery box 3, and there is a thermally conductive structural adhesive 2 for bonding the two between the stacked battery cell group 1 and the battery box 3;

[0040] Among them, microspheres are mixed inside the thermally conductive structural adhesive 2 to dissolve the thermally conductive structural adhesive 2 by the microspheres during maintenance;

[0041] When the battery pack fails and needs to be repaired, it is convenient to heat the liquid cooling plate 32 to reach the phase change temperature of paraffin, release the solubilizer 22 inside the soluble shell 21, dissolve the thermally conductive structural adhesive 2, and achieve the effect of reducing the bonding strength of the thermally conductive structural adhesive 2, facilitating the removal of the battery cell stacking group 1 for repair.

[0042] Preferably, the thermally conductive structural adhesive 2 includes a soluble shell 21 and a solubilizer 22, and the solubilizer 22 is arranged inside the soluble shell 21;

[0043] When the battery pack is normal, it is convenient to perform stable adhesive fixation through the thermally conductive structural adhesive 2. When the battery pack fails, the bonding effect of the thermally conductive structural adhesive 2 is reduced.

[0044] Preferably, the solubilizer 22 is a lipid solvent or a ketone solvent;

[0045] It is convenient to perform sol to better reduce the bonding strength of the thermally conductive structural adhesive 2.

[0046] Preferably, the material of the soluble shell 21 is paraffin, and the diameter of the soluble shell 21 is 10 - 50 μm;

[0047] It is convenient to dissolve by heating, thereby releasing the solubilizer 22 inside.

[0048] Preferably, the preparation of the microspheres is one or more of the solvent evaporation method, spray drying method, phase separation method, microfluidic technology, and electrospray method;

[0049] It is convenient to quickly manufacture the microspheres.

[0050] Preferably, the battery cell stacking group 1 includes battery cells 11 and double-sided adhesive 12, and the battery cells 11 and the double-sided adhesive 12 are arranged side by side to fix two adjacent battery cells 11 through the double-sided adhesive 12;

[0051] It is convenient to connect and fix multiple battery cells 11 to prevent them from shaking after being placed inside the battery box body 3.

[0052] Preferably, the battery box body 3 further includes a frame 31, a bottom guard plate 33, a cavity 34, and a rubber pad 35. The bottom surface of the frame 31 is fixed with the bottom guard plate 33 by bolts, and the liquid cooling plate 32 is located between the frame 31 and the bottom guard plate 33. The rubber pad 35 is connected to the bottom guard plate 33 through a groove, and a cavity 34 for heat insulation is arranged inside the bottom guard plate 33;

[0053] It is convenient to prevent the bottom protection plate 33 from cracking and deforming towards the side of the battery cell stack group 1 after being collided and squeezed by external objects on the lower surface, directly causing puncture damage to the battery cell stack group 1, facilitating the blocking of the cracking and deforming of the bottom protection plate 33, ensuring the safety of the battery cell stack group 1, and being able to provide good heat insulation to reduce the influence of external heat on the battery cell stack group 1.

[0054] Preferably, the bottom protection plate 33 includes a first protection plate 331, a second protection plate 332, a connecting slider 333 and a connecting bolt 334. The first protection plate 331 and the second protection plate 332 are arranged side by side, and one end face of the second protection plate 332 has a connecting slider 333 that is slidably connected to the first protection plate 331. A connecting bolt 334 extending into the inner side of the connecting slider 333 is connected to the lower surface of the first protection plate 331 through a threaded portion;

[0055] It is convenient to avoid the overall scrapping of the integral bottom protection plate 33 after damage through the detachable first protection plate 331 and second protection plate 332, resulting in waste. The detachable design is conducive to later maintenance and replacement, reducing the maintenance cost.

[0056] Preferably, the cross-section of the connecting slider 333 is "convex" shaped;

[0057] It is convenient to quickly connect the first protection plate 331 and the second protection plate 332 to form a whole.

[0058] Preferably, the material of the rubber pad 35 is silicone rubber;

[0059] It is convenient to have better high-temperature resistance and elastic effects.

[0060] The working principle and usage process of the present invention: When in use, during the normal operation of the battery pack, the thermally conductive structural adhesive 2 and the microspheres jointly participate in heat conduction. The microspheres are made of a soluble shell 21, and a solubilizing agent 22 is placed inside. The material of the soluble shell 21 is paraffin. When the normal temperature of the battery pack does not exceed the phase change of paraffin, when the battery pack fails and needs to be repaired, the liquid cooling plate 32 is heated to reach the paraffin phase change temperature, releasing the solubilizing agent 22 inside the soluble shell 21 and dissolving the thermally conductive structural adhesive 2, achieving the effect of reducing the bonding strength of the thermally conductive structural adhesive 2, facilitating the removal of the battery cell stack group 1 for repair. Further, through the rubber pad 35 and the cavity 34, it is convenient to reduce the transfer of external heat to the battery cell stack group 1. And when an external object accidentally collides with the lower surface of the bottom protection plate 33, the elastic deformation of the rubber pad 35 can buffer the collision, blocking the puncture of the battery cell stack group 1 caused by the bottom protection plate 33 being damaged by the collision, improving the safety of the battery cell stack group 1. Further, the bottom protection plate 33 is composed of the first protection plate 331 and the second protection plate 332, and later they can be separately replaced and maintained, reducing the waste caused by overall scrapping.

[0061] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery pack structure, characterized in that: include: A battery box (3), wherein the inner side of the battery box (3) comprises a liquid cooling plate (32) for heat dissipation; A battery cell stacking group (1) is arranged inside a battery box (3), and a heat-conducting structural adhesive (2) is provided between the battery cell stacking group (1) and the battery box (3) for bonding the two together; The thermally conductive structural adhesive (2) is mixed with microspheres inside so that the microspheres can dissolve the thermally conductive structural adhesive (2) during maintenance.

2. A battery pack structure according to claim 1, characterized in that: The thermally conductive structural adhesive (2) comprises a soluble shell (21) and a sol (22), wherein the sol (22) is arranged on the inner side of the soluble shell (21).

3. A battery pack structure according to claim 2, characterized in that: The sol (22) is a lipid solvent or a ketone solvent.

4. A battery pack structure according to claim 2, characterized in that: The material of the soluble shell (21) is paraffin, and the diameter of the soluble shell (21) is 10-50 μm.

5. A battery pack structure according to claim 1, characterized in that: The microspheres are prepared by one or more of solvent evaporation method, spray drying method, phase separation method, microfluidic technology, and electrostatic spraying method.

6. A battery pack structure according to claim 1, characterized in that: The battery cell stacking group (1) comprises a battery cell (11) and a double-sided adhesive tape (12); the battery cell (11) and the double-sided adhesive tape (12) are arranged side by side so that two adjacent battery cells (11) are fixed by the double-sided adhesive tape (12).

7. A battery pack structure according to claim 1, characterized in that: The battery box (3) further comprises a frame (31), a bottom guard plate (33), a cavity (34) and a rubber pad (35); the bottom guard plate (33) is fixed to the lower surface of the frame (31) by bolts, and the liquid cooling plate (32) is located between the frame (31) and the bottom guard plate (33); the rubber pad (35) is connected to the bottom guard plate (33) by a groove; and a cavity (34) for heat insulation is provided inside the bottom guard plate (33).

8. A battery pack structure according to claim 7, characterized in that: The bottom guard plate (33) includes a first guard plate (331), a second guard plate (332), a connecting slider (333) and a connecting bolt (334); the first guard plate (331) and the second guard plate (332) are arranged side by side, and one end surface of the second guard plate (332) has a connecting slider (333) slidably connected to the first guard plate (331); the lower surface of the first guard plate (331) is connected to a connecting bolt (334) extending into the inner side of the connecting slider (333) through a threaded portion.

9. A battery pack structure according to claim 8, characterized in that: The cross section of the connecting slider (333) is in the shape of a "convex" character.

10. A battery pack structure according to claim 7, characterized in that: The rubber pad (35) is made of silicone rubber.

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