A detachable CTP power battery

Abstract

The utility model provides a detachable CTP power battery relates to battery technical field, include: battery box, be equipped with a plurality of electric core module in battery box, a plurality of liquid cooling plates, each liquid cooling plate is coated with soluble coating, each electric core module is pasted on the corresponding liquid cooling plate through the soluble coating. Advantageous effect is through dividing the traditional whole liquid cooling plate into a plurality of separate liquid cooling plates, to realize the whole structure of CTP power battery is divided into several areas, when the electric core in any area is abnormal or needs to be disassembled and analyzed, the abnormal electric core and the corresponding liquid cooling plate can be disassembled, other parts of the battery are not damaged, the disassembly efficiency and the disassembly integrity are improved, the subsequent maintenance, disassembly analysis etc. can greatly reduce the scrap cost and after-sales expense of whole battery system.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a detachable CTP power battery. Background Technology

[0002] In recent years, with the increasing demand for improved driving range and reduced battery costs in new energy vehicles, the industry urgently needs to develop new packaging technologies beyond the traditional three-level packaging process of "cell-module-pack". To improve battery space utilization and reduce intermediate steps, CTP technology (Cell to Pack) has emerged. However, because CTP directly connects the cell and liquid cooling plate with thermally conductive adhesive, it poses significant challenges to the subsequent disassembly and repair of the battery pack. During disassembly and analysis or after-sales service of CTP battery systems, the connection between the cell and liquid cooling plate via thermally conductive adhesive can cause varying degrees of damage to the cell or liquid cooling plate and other components during disassembly. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides a detachable CTP power battery, comprising:

[0004] A battery housing containing multiple battery cell modules;

[0005] Multiple liquid cooling plates, each coated with a soluble coating, and each battery cell module is attached to the corresponding liquid cooling plate through the soluble coating.

[0006] Preferably, the battery housing is divided into multiple battery compartments, each of which contains at least one of the battery cell modules, and each of the battery compartments has a liquid cooling plate at its bottom.

[0007] Preferably, the top cover of the battery box is provided with a top cover, and the top cover is provided with multiple grooves.

[0008] Preferably, each of the grooves is arranged side by side along the length of the upper cover.

[0009] Preferably, the liquid cooling plate is provided with an S-shaped flow channel, and the inlet and outlet of the S-shaped flow channel are connected to an external heat exchange system.

[0010] Preferably, the bottom of the battery box is covered with a bottom protective plate, and supporting foam is bonded between the bottom protective plate and each of the liquid cooling plates.

[0011] Preferably, one end of the battery box is chamfered, and the top cover and the bottom cover are chamfered at corresponding positions.

[0012] Preferably, the other end of the battery box forms a protruding box positioning structure, the corresponding position of the top cover is provided with a cover positioning structure adapted to the box positioning structure, and the corresponding position of the bottom guard plate is provided with a bottom plate positioning structure adapted to the box positioning structure.

[0013] Preferably, the battery cell module includes:

[0014] Multiple individual battery cells are stacked horizontally.

[0015] End plates are disposed at both ends of the stacked battery cells.

[0016] Preferably, the end plate is made of plastic.

[0017] The above technical solution has the following advantages or beneficial effects:

[0018] By dividing the traditional monolithic liquid cooling plate into multiple individual liquid cooling plates, the overall structure of the CTP power battery can be divided into several regions. When a cell in any region malfunctions or needs to be disassembled for analysis, the soluble coating can be dissolved to selectively remove the malfunctioning cell and its corresponding liquid cooling plate without damaging other parts of the battery. This improves disassembly efficiency and integrity, facilitates subsequent maintenance and disassembly analysis, and can greatly reduce the scrapping cost and after-sales expenses of the entire battery system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the exploded structure of a detachable CTP power battery in a preferred embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the liquid cooling plate in a preferred embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the coating in a preferred embodiment of the present invention. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment; other embodiments that conform to the spirit of the present invention may also fall within its scope.

[0023] In a preferred embodiment of this utility model, based on the above-mentioned problems existing in the prior art, a detachable CTP power battery is provided, characterized in that, as Figure 1-3 The following are included:

[0024] Battery housing 1, wherein multiple battery cell modules 2 are provided in the battery housing 1;

[0025] Multiple liquid cooling plates 5, each of which is coated with a soluble coating 6, and each of the battery cell modules 2 is attached to the corresponding liquid cooling plate 5 through the soluble coating 6.

[0026] Specifically, such as Figure 1 As shown, by setting multiple independent liquid cooling plates 5, the overall structure of the CTP power battery is divided into several independent areas. Before the cell module 2 is put into the box, a soluble coating 6 is applied to the liquid cooling plate 5 (the coating is dissolved by means of solvent or heating), so that the cell module 2 can be bonded to the soluble coating 6. Correspondingly, when it is necessary to disassemble, the soluble coating 6 is dissolved by means of solvent or heating, so that the cell module 2 that needs to be disassembled can be disassembled individually.

[0027] Furthermore, the "soluble coating" refers to a material layer that can dissolve, soften, decompose, or lose its adhesiveness under specific triggering conditions (such as contact with a specific solvent or heating to a specific temperature), thereby releasing the adhesive force. This coating must maintain sufficient adhesive strength, thermal stability, and chemical stability under normal battery operating conditions. Common types of soluble coatings include water-soluble adhesives (such as PVA adhesive), solvent-soluble adhesives, hot melt adhesives (such as EVA), or thermally decomposable adhesives. These types of soluble adhesive materials are existing technologies in packaging, labeling, and temporary fixing. This invention applies them to the interface between the battery liquid cooling plate and the cell module. The core innovation lies in utilizing the controllable dissolution characteristics of this coating to achieve convenient and removable cell modules.

[0028] When a cell in any area malfunctions or needs to be disassembled for analysis, the liquid cooling plate 6 in the area where the malfunctioning cell is located can be disassembled in a targeted manner without damaging other battery modules, thus improving disassembly efficiency and integrity.

[0029] In a preferred embodiment of the present invention, the battery housing 1 is divided into multiple battery compartments 11, each battery compartment 11 is provided with a battery cell module 2, and each liquid cooling plate 5 corresponds to the bottom of a battery compartment 11.

[0030] Specifically, such as Figure 1As shown, in the CTP power battery of this utility model, the battery box is divided into 4 independent battery compartments 11 (in other embodiments, it can be divided into 2, 6, 8, etc. as needed, corresponding to the number of liquid cooling plates 5). Each battery compartment 11 contains a CTP structure cell module 2, so that the cell modules 2 in different areas do not interfere with each other. When a cell in any battery compartment 11 malfunctions or needs to be disassembled for analysis, the liquid cooling plate 6 of that battery compartment 11 can be disassembled in a targeted manner without damaging other battery modules, thus improving disassembly efficiency and integrity.

[0031] In a preferred embodiment of the present invention, the top cover of the battery box 1 is provided with an upper cover 3, and the upper cover 3 is provided with a plurality of grooves 31.

[0032] In a preferred embodiment of this utility model, each groove 31 is arranged side by side along the length of the upper cover.

[0033] Specifically, such as Figure 1 As shown, the top cover has multiple grooves 31 arranged side by side. The grooves 31 significantly improve the bending stiffness by forming an "I-beam profile". When the top cover 3 is subjected to a vertical load, a compression zone is formed at the top of the grooves 31 and a tension zone is formed at the bottom, which can significantly improve the cross-sectional compression resistance compared to a flat plate structure.

[0034] Moreover, the periodically arranged grooves 31 form a "stress waveguide" structure. When subjected to mechanical impact (such as a drop hammer test), the stress wave propagates along the groove array in a sinusoidal curve. Compared with a randomly arranged structure, the peak stress attenuation rate is increased by 60% (based on LS-DYNA impact simulation).

[0035] When the spacing between adjacent grooves 31 is controlled at 80-120mm (based on the standard size of the battery module), an effective stress interference zone can be formed, avoiding the occurrence of stress blank zones.

[0036] In another embodiment, a typical V-groove (60°-90° included angle) is used to create a stress transfer path similar to a truss structure, dispersing local loads into axial stress and effectively reducing the peak stress concentration factor.

[0037] In a preferred embodiment of the present invention, the liquid cooling plate 5 is provided with an S-shaped flow channel 51, and the inlet and outlet of the S-shaped flow channel 51 are connected to an external heat exchange system.

[0038] Specifically, in this embodiment, an S-shaped flow channel 51 is used to make the coolant coverage area reach 85%-90% of the surface area of ​​the liquid cooling plate 5, which can significantly improve the cooling effect.

[0039] Furthermore, the spacing of the S-shaped flow channels 51 can be reserved by 1-2 mm, and paraffin-based phase change material (PCM) can be filled in the spacing to construct a liquid-cooled-phase change composite thermal management system.

[0040] In a preferred embodiment of the present invention, a bottom cover plate 4 is provided on the bottom of the battery box 1, and supporting foam is bonded between the bottom cover plate 4 and each liquid cooling plate 5.

[0041] Specifically, in this embodiment, the dynamic shear modulus (0.1-0.5MPa) of the supporting foam (such as PORON, IXPE, etc.) can effectively absorb Z-axis impact energy, reducing the dynamic stress amplitude between the liquid cooling plate and the bottom guard plate within the 5-200Hz vibration frequency range. Furthermore, the supporting foam has a 15%-25% compression deformation margin, providing a buffer stroke of >3mm under mechanical impact conditions (such as a 15g half-sine wave impact), protecting the liquid cooling plate flow channel structure from deformation.

[0042] In a preferred embodiment of the present invention, the outer wall of the battery box 1 is provided with a plurality of extensions 12, each extension 12 having a fixing screw hole, and the top cover is fixedly connected to the fixing screw hole by screws.

[0043] Specifically, in this embodiment, the outer wall of the battery box is provided with an extension for fixing with screws to other components, and the battery box in this embodiment is provided with a cross-shaped support frame 13 in the middle, which mainly divides the internal structure of the battery box into 4 battery compartments 11, and provides XY support force to resist external forces from squeezing the battery box in the XY direction.

[0044] In a preferred embodiment of the present invention, one end of the battery box 1 is provided with a chamfer 14, and the upper cover 3 and the bottom protective plate 4 are provided with the same chamfer 14 at corresponding positions.

[0045] In a preferred embodiment of the present invention, a protruding housing positioning structure 15 is formed at the other end of the battery box 1, a cover positioning structure 32 adapted to the housing positioning structure 15 is provided at the corresponding position of the upper cover 3, and a bottom plate positioning structure 42 adapted to the housing positioning structure 15 is provided at the corresponding position of the bottom guard plate 4.

[0046] Specifically, in this embodiment, a two-stage assembly guidance sequence is formed by the chamfer 14 (30°-45° guide slope) set on the battery box 1 and the positioning structure: first, coarse guidance is achieved through the chamfer (more than 80% of the deviation is eliminated), and finally, the contact surface of the positioning structure is finely corrected, which can ensure the corresponding installation of the top cover and bottom guard plate with the battery box.

[0047] In a preferred embodiment of this utility model, the battery cell module 2 includes:

[0048] Multiple individual battery cells are stacked horizontally.

[0049] End plates are located at both ends of the stacked battery cells.

[0050] Specifically, the cell module in this embodiment adopts a CTP (Cell-to-Pack) structure, meaning that the cell module has no top or bottom covers, no side plates, and only two end plates. Its biggest feature is that it skips the module stage and directly integrates the cell onto the battery pack, simplifying the battery pack structure and assembly process. This further improves volume utilization, production efficiency, and energy density, while also reducing the number of components.

[0051] In a preferred embodiment of this invention, the end plate is made of plastic.

[0052] Specifically, the density of plastic is 1.1-1.4 g / cm³. 3 Only aluminum alloy (2.7g / cm³) 3 This reduces the weight of the end plate by 40%-50%, which can decrease its mass by 50%-60%. Furthermore, the volume resistivity of the plastic end plate is >10⁻⁶. 12 Ω·cm, much higher than that of metal end plates (typically <10). -6 (Ω·cm) can effectively block the leakage current path between cells.

[0053] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present utility model.

Claims

1. A detachable CTP power battery, characterized in that, include: A battery housing containing multiple battery cell modules; Multiple liquid cooling plates, each coated with a soluble coating, and each battery cell module is attached to the corresponding liquid cooling plate through the soluble coating.

2. The CTP power cell of claim 1, wherein, The battery housing is divided into multiple battery compartments, each of which contains at least one of the battery cell modules, and each battery compartment has a liquid cooling plate at its bottom.

3. The CTP power cell of claim 1, wherein, The top of the battery box is covered with a top cover, and the top cover has multiple grooves.

4. The CTP power cell of claim 3, wherein, Each of the grooves is arranged side by side along the length of the upper cover.

5. The CTP power battery according to claim 1, characterized in that, The liquid cooling plate is provided with an S-shaped flow channel, and the inlet and outlet of the S-shaped flow channel are connected to an external heat exchange system.

6. The CTP power cell of claim 3, wherein, The bottom of the battery box is covered with a bottom protective plate, and supporting foam is bonded between the bottom protective plate and each of the liquid cooling plates.

7. The CTP power cell of claim 6, wherein, One end of the battery box is chamfered, and the corresponding position of the top cover or the bottom protective plate is also chamfered.

8. The CTP power cell of claim 6, wherein, The other end of the battery box forms a protruding box positioning structure, the corresponding position of the top cover is provided with a cover positioning structure adapted to the box positioning structure, and the corresponding position of the bottom guard plate is provided with a bottom plate positioning structure adapted to the box positioning structure.

9. The CTP power cell of claim 1, wherein, The battery cell module includes: Multiple individual battery cells are stacked horizontally. End plates are disposed at both ends of the stacked battery cells.

10. The CTP power cell of claim 9, wherein, The end plate is made of plastic.

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