Filling assembly for battery assembly, battery assembly and electric equipment

Abstract

The invention relates to the technical field of batteries, and discloses a filling assembly for a battery assembly, the battery assembly and electric equipment. In the prior art, a pre-tightening force scheme of steel rolling belt binding or glue filling has the problems of safety risk, non-uniform stress of a battery cell, large weight and the like. According to the invention, the filling assembly is arranged between the end part of the battery cell module and the tray, the side plate of the filling assembly and the convex block on the edge beam of the tray form the wedge-shaped matching surface, and the compressible material is stressed through wedge-shaped extrusion when the module enters a cavity, so that the battery cell is uniformly clamped. The side plates are made of PPO materials, the second side face is of a honeycomb structure, and the compressible material is PU foam. The scheme solves the problems of insufficient pre-tightening force and uneven stress in the prior art, has the advantages of high reliability, uniform stress, large gap adaptation range, simplicity in assembly, low cost, facilitation of light weight, improvement of low-temperature fast charging performance and the like, and is suitable for battery core stacking assembly of battery components such as CTB (computer to board), CTP (computer to plate) and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and more particularly to a filling assembly for a battery assembly, a battery assembly, and an electrical device. Background Art

[0002] In CTB and CTP battery packs, pre-tightening force needs to be applied when stacking the cells to ensure that the cells remain clamped during the charge and discharge cycle, thereby reducing impedance and improving battery performance.

[0003] The existing preload stacking solution has obvious defects: although the steel strip bundling solution can maintain the preload, it is easy to damage the blue film and poses a safety hazard; although the pull-rod glue filling solution improves safety, the battery cells at both ends of the module are not subjected to enough force, and the glue filling will increase the weight of the package, affecting the lightweight design.

[0004] Therefore, there is an urgent need for a new filling component that can simultaneously meet the requirements of continuous preload, safety and improved battery performance. Summary of the Invention

[0005] The technical problem addressed by this invention is that existing steel strip bundling solutions are prone to damaging the blue film, posing a safety risk. The existing steel strip bundling solution, with its glue filling method, results in insufficient force on the cells at both ends of the module, resulting in reduced capacity utilization, and the glue filling increases the weight of the package. A new solution is needed that balances sustained preload and safety, improving battery performance and lifespan.

[0006] To solve the above technical problems, on the one hand, a filling assembly for a battery assembly is provided, characterized in that it includes:

[0007] A filling assembly for a battery assembly is characterized by comprising: the filling assembly is arranged between the end of the battery cell module of the battery assembly and the tray, the filling assembly includes a side plate, and the side plate abuts against the tray.

[0008] As an optional technical solution of the present invention, the tray includes a protrusion, and both the protrusion and the side plate are wedge-shaped structures. The side plate and the protrusion form a wedge-shaped matching surface to abut against each other.

[0009] As an optional technical solution of the present invention, the pallet further includes side beams, and the protrusions are fixed to the side beams by welding or are integrally formed.

[0010] As an optional technical solution of the present invention, the side plate includes a first side surface and a second side surface that are opposite to each other, the first side surface is a plane abutting against the protrusion, and the second side surface is honeycomb-shaped.

[0011] As an optional technical solution of the present invention, the first side surface and the bevel angle of the protrusion are consistent.

[0012] As an optional technical solution of the present invention, a slot is provided on the side panel for installing a low-voltage sampling harness or a high-voltage copper busbar, aluminum busbar, etc.

[0013] As an optional technical solution of the present invention, the filling component further includes a compressible material, and the compressible material is arranged between the end of the battery cell module and the side plate.

[0014] As an optional technical solution of the present invention, the compressible material is arranged in contact with the second side surface.

[0015] As an optional technical solution of the present invention, the compressible heat-insulating material is PU foam, and the material of the side panels is PPO.

[0016] On the other hand, as an optional technical solution of the present invention, the present invention discloses a battery assembly, comprising: an upper cover and the above-mentioned filling assembly, the upper cover and the tray form a accommodating cavity, and the accommodating cavity is used to accommodate the battery cell module and the filling assembly.

[0017] As an optional technical solution of the present invention, the filling component is arranged relative to the end of the battery cell module.

[0018] On the other hand, as an optional technical solution of the present invention, the present disclosure also provides an electrical device including the above-mentioned battery assembly.

[0019] The beneficial effects disclosed herein are as follows: the present invention adopts a combination of wedge-shaped side panels and tray side beams, and the compressible material is forced to compress the battery cell through the extrusion of the wedge-shaped mating surface, so that the end face and the middle battery cell are subjected to consistent force, which has the advantages of high reliability, uniform force, large gap adaptation range, adjustable foam thickness and side panel side beam shape, simple assembly, low cost, and is conducive to lightweight and platform-based promotion. In addition, the PU foam has a low thermal conductivity coefficient, which can maintain the heat of the battery cell, reduce internal resistance, and improve charging performance during low-temperature fast charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a partial structural diagram of some embodiments of the present invention Figure 1 ;

[0022] Figure 2 This is a partial structural diagram of some embodiments of the present invention Figure 2 ;

[0023] Figure 3 This is a partial structural diagram of some embodiments of the present invention Figure 3 ;

[0024] The reference numerals in the specification are as follows:

[0025] 1. Filling component; 11. Side panel; 111. First side surface; 112. Second side surface; 12. Compressible material; 2. Tray; 21. Side beam; 22. Convex fastener; 3. Battery cell module. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of them. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0027] An explosion-proof valve, a cover plate, a battery, a battery assembly, and an electrical device according to the present disclosure are described in detail below.

[0028] In an optional embodiment of the present disclosure, Figure 1-3 , a filling assembly 1 for a battery assembly is provided, characterized in that the filling assembly 1 is arranged between the end of the battery cell module 3 of the battery assembly and the tray 2, and the filling assembly 1 includes a side panel 11, which abuts the tray 2. Specifically, the filling assembly 1 adopts a plastic side panel 11, which is installed between the two ends of the battery cell module 3 and the inner side wall of the tray 2. The edge of the side panel 11 fits tightly with the inner plane of the side beam 21 of the tray 2, forming a lateral constraint structure for the battery cell module. The abutment between the side panel and the tray provides an initial pre-tightening force for the battery cell module to prevent the battery cell from being displaced due to vibration, while laying the foundation for the force transmission of the subsequent wedge extrusion structure.

[0029] In some embodiments, as Figure 1-3 The tray 2 includes a protrusion 22. Both the protrusion 22 and the side panel 11 are wedge-shaped structures. The side panel 11 and the protrusion 22 form a wedge-shaped mating surface to abut against each other. Specifically, a wedge-shaped welding block 22 (with a bevel angle of 5°-10°) is welded on the side beam 21 of the tray 2, and the corresponding position of the side panel 11 is designed as a wedge-shaped surface with the same angle. When the module is installed in the tray, the wedge-shaped surfaces of the two fit tightly together to form an extrusion structure. The wedge-shaped mating surface generates a horizontal component of force when the tray is inverted, pushing the side panel to squeeze the battery module, so that the compressible material is compressed, and the battery cell is evenly clamped, solving the problem of uneven force.

[0030] In some embodiments, as Figure 1-3The tray 2 also includes side beams 21, and the protrusions 22 are welded to the side beams 21 or integrally formed with them. Specifically, the protrusions 22 are made of aluminum alloy and are fixed to the side beams 21 by laser welding (weld strength ≥ 300 MPa) or integrally formed with the side beams by die-casting. Welding or integral molding ensures a secure connection between the protrusions and the side beams, preventing displacement during extrusion and ensuring that the preload force is effectively transmitted to the side panels and battery modules.

[0031] In some embodiments, as Figure 1-3 The side panel 11 includes a first side surface 111 and a second side surface 112. The first side surface 111 is flat and abuts the protrusion 22, while the second side surface 112 has a honeycomb pattern. Specifically, the first side surface 111 of the side panel 11 is milled into a smooth surface that aligns with the wedge-shaped surface of the protrusion 22. The second side surface 112 adopts a honeycomb hollow structure (pore diameter 2-5mm, pore depth 1 / 3 of the side panel thickness). The flat first side surface design maximizes contact area and improves force transmission efficiency. The honeycomb second side surface reduces friction with the compressible material and reduces the weight of the side panel.

[0032] In some embodiments, as Figure 1-3 The first side surface 111 and the bump 22 have the same bevel angle. Specifically, the bevel angles of the first side surface 111 of the side panel 11 and the bump 22 are both 8° (with a tolerance of ±0.5°), precisely controlled by the mold to ensure a gap-free fit. The consistent bevel angles ensure a uniform horizontal force distribution across the side panel, avoiding localized stress concentration and ensuring uniform force distribution across the battery cell module.

[0033] In some embodiments, as Figure 1-3 The side panel 11 is provided with a slot for installing low-voltage sampling wiring harnesses or high-voltage copper and aluminum busbars. Specifically, a rectangular slot (8-15mm wide and 5-10mm deep) is provided on the edge of the side panel 11, and an insulating rubber strip is provided inside for inserting low-voltage sampling wiring harnesses or fixing high-voltage copper / aluminum busbars. The slot design provides installation space for wiring harnesses and conductive busbars, optimizes the battery pack layout, prevents exposed wiring harnesses from contacting battery cells, and improves safety and compatibility.

[0034] In some embodiments, as Figure 1-3 The filling assembly 1 also includes a compressible material 12, which is positioned between the end of the cell module 3 and the side panel 11. Specifically, the compressible material 12 is made of 3-5 mm thick PU foam, cut into rectangular sheets that match the cell end and positioned between the end of the cell module 3 and the second side surface 112 of the side panel 11. The PU foam elastically deforms under pressure, providing a continuous preload for the cell, absorbing the cell's expansion deformation during charge and discharge, and preventing performance degradation caused by stress concentration.

[0035] In some embodiments, as Figure 1-3The compressible material 12 is positioned in contact with the second side surface 112. Specifically, the compressible material 12 is slightly larger than the end of the battery cell, with one side closely contacting the end surface of the battery cell module 3 and the other side completely conforming to the honeycomb-shaped second side surface 112 of the side panel 11. This precise contact ensures uniform compression of the compressible material, preventing cell displacement. The honeycomb surface and the foam distribute pressure, improving preload uniformity.

[0036] In some embodiments, as Figure 1-3 The compressible heat-insulating material 12 is PU foam and the material of the side panel 11 is PPO. Specifically, the compressible material 12 is selected to have a density of 30-50 kg / m 3 PU foam (thermal conductivity ≤ 0.03W / (m·K)), the side panel 11 is made of PPO engineering plastic (density 1.07-1.10g / cm 3 , tensile strength ≥60MPa) injection molding. PU foam's low thermal conductivity reduces heat loss from the battery cell, maintaining temperature and lowering internal resistance during low-temperature fast charging. The PPO side panels offer excellent mechanical properties and light weight, contributing to lightweight and cost-effective battery pack design.

[0037] In some embodiments, as Figure 1-3 , provides a battery assembly, including an upper cover and the aforementioned filling assembly 1, and a receiving cavity formed by the upper cover and tray 2, which is used to accommodate the battery cell module 3 and the filling assembly 1. Specifically, the tray 2 is a rectangular cavity (with longitudinal beams and side beams at the bottom), and the upper cover is a flat structure fixed to the edge of the tray by bolts; the filling assembly 1 is installed on both sides of the tray cavity, and the battery cell module 3 is placed in the center. The upper cover is closed to form a sealed receiving cavity. The receiving cavity provides mechanical protection for the battery cell module and filling assembly, preventing external impact and dust intrusion. The sealing design improves the waterproof and dustproof performance of the battery assembly.

[0038] In some embodiments, as Figure 1-3 The filler assembly 1 is positioned opposite the end of the cell module 3. Specifically, a set of filler assemblies 1 is installed on each side of the tray 2 cavity, with the center axis of the cell module 3 as the axis of symmetry, ensuring uniform preload on both sides. The opposing filler assemblies apply bidirectional symmetrical preload to the cell module, preventing module deviation, ensuring consistent cell clamping force, and improving battery pack performance stability.

[0039] In some embodiments, as Figure 1-3 The present invention also provides an electrical device comprising the aforementioned battery assembly. Specifically, the electrical device is a new energy vehicle, energy storage power station, or portable electronic device. The battery assembly is secured within the device via a bracket and electrically connected to the electronic control system and energy management system. Electrical devices employing this battery assembly can achieve stable charge and discharge performance, improve low-temperature fast charging efficiency, extend battery life, and utilize a lightweight design to reduce device weight.

[0040] The present disclosure relates to the field of battery technology and provides a filling assembly for a battery assembly 1, a battery assembly, and an electrical device. A filling assembly for a battery assembly is provided, comprising: the filling assembly 1 is arranged between the end of the battery cell module 3 of the battery assembly and the tray 2, the filling assembly 1 includes a side panel 11, and the side panel abuts the tray 2. The present invention arranges a filling assembly with a wedge-shaped side panel between the end of the battery cell module and the tray, and utilizes the wedge-shaped mating surface of the tray protrusion and the side panel to squeeze the compressible material so that the battery cell is evenly stressed, thereby solving the problems of insufficient preload, uneven force, and safety risks in the prior art, and having the advantages of high reliability, uniform force, and a wide gap adaptability range; the honeycomb structure of the side panel and the slot design achieve lightweighting and layout optimization, the low thermal conductivity of the PU foam improves the low-temperature fast charging performance, and the PPO material reduces costs; the battery assembly's accommodating cavity and the symmetrical filling assembly design provide mechanical protection and preload consistency, which can improve charging and discharging stability, extend battery life, and reduce equipment weight when applied to electrical equipment.

[0041] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present disclosure.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0043] In this disclosure, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0044] In the present disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0046] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A filling assembly (1) for a battery assembly, characterized in that include: The filling assembly (1) is arranged between the end of the battery cell module (3) of the battery assembly and the tray (2), and the filling assembly (1) includes a side plate (11) that abuts against the tray (2).

2. The filling assembly (1) according to claim 1, characterized in that The tray (2) includes a protrusion (22); the protrusion (22) and the side plate (11) are both wedge-shaped structures; the side plate (11) and the protrusion (22) form a wedge-shaped matching surface so as to abut against each other.

3. The filling assembly (1) according to claim 1, characterized in that The tray (2) further comprises a side beam (21), and the protrusion (22) and the side beam (21) are fixed by welding or integrally formed.

4. The filling assembly (1) according to claim 1, wherein the side plate (11) comprises a first side surface (111) and a second side surface (112) opposite to each other, the first side surface (111) being a plane abutting against the protrusion (22), and the second side surface (112) being honeycomb-shaped.

5. The filling assembly (1) according to claim 1, characterized in that The first side surface (111) and the projection (22) have the same inclined angle.

6. The filling assembly (1) according to claim 1, characterized in that The side plate (11) is provided with a slot for installing a low-voltage sampling wire harness or a high-voltage copper busbar, aluminum busbar, etc.

7. The filling assembly (1) according to claim 1, characterized in that The filling assembly (1) further comprises a compressible material (12), wherein the compressible material (12) is arranged between the end of the battery core module (3) and the side plate (11).

8. The filling assembly (1) according to claim 7, characterized in that The compressible material (12) is disposed in contact with the second side surface (112).

9. The filling assembly (1) according to claim 7, characterized in that The compressible heat-insulating material (12) is PU foam, and the material of the side panel (11) is PPO.

10. A battery assembly, characterized in that: It comprises an upper cover and a filling assembly (1) according to any one of claims 1 to 9, wherein the upper cover and the tray (2) form a receiving cavity, and the receiving cavity is used to receive the battery cell module (3) and the filling assembly (1).

11. The battery assembly according to claim 10, characterized in that The filling assembly (1) is arranged relative to the end of the battery core module (3).

12. An electrical device, characterized in that: A battery assembly comprising the battery assembly according to any one of claims 10-11.

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