A CTP battery pack box body structure
Patent Information
- Application Number
- CN202522533933.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-28
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-11-28
AI Technical Summary
[0002]参照图1，为现有CTP电池包结构示意图，具体来说，该CTP电池包主体由电芯模组1以及对电芯模组进行支撑的框架结构组成，其中框架结构包括支撑板2和箱体边框5，组装时，将电芯模组1通过例如结构胶固定于支撑板2上，并将支撑板2和箱体边框5焊接以组成CTP电池包，同时为了匹配CTP电池包底部的冲击和刮底防护要求，上述框架结构还包括设置于支撑板2下方的底护板3，并在底护板3和支撑板2间设置钣金支撑梁4，即将钣金支撑梁4焊接于支撑板2和底护板3之间以实现底护板的安装，基于钣金支撑梁4的支撑方案，一方面由于需要增设钣金支撑梁4，增加了物料零件数量；另一方面，由于需要钣金支撑梁4焊接在支撑板2和底护板3之间，即需要惊醒额外的焊接工序，增加了质量管控点，对应地，质量风险会增大；同时由于钣金支撑梁宽度较大，焊点多，热变形严重、应力集中加剧、材料性能劣化，导致CTP电池包重量较重且成本较高
[0005]通过将支撑板体设计成具有支撑部和凹筋部的波纹板结构，凹筋部直接承担了原有钣金支撑梁的连接与支撑功能，无需再额外增设独立的钣金支撑梁零件，省去了钣金支撑横梁零件，使得电池包框架结构的零件数量显著精简，在降低了箱体结构整体重量的同时减少了不同零件间的尺寸适配误差，提高了箱体装配的兼容性，且凹筋部作为支撑板体的一体结构，其第一连接部直接与防护板体通过单次焊接即可实现固定，无需像钣金支撑梁那样进行两次焊接；同时，凹筋部的结构设计使得焊接区域更集中、焊点布局更合理，大幅减少了焊接次数，且焊接次数的减少直接对应质量管控点的缩减，降低了因多焊点质量波动带来的生产风险，减少了质量检测的人力与时间成本，提升了生产过程的稳定性与可靠性。
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Figure CN224922875U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of power battery technology, and specifically relates to a CTP battery pack housing structure. Background Technology
[0002] Reference Figure 1 This is a schematic diagram of an existing CTP battery pack structure. Specifically, the main body of the CTP battery pack consists of a cell module 1 and a frame structure that supports the cell module. The frame structure includes a support plate 2 and a housing frame 5. During assembly, the cell module 1 is fixed to the support plate 2 using, for example, structural adhesive, and the support plate 2 and housing frame 5 are welded together to form the CTP battery pack. In order to meet the impact and scratch protection requirements of the bottom of the CTP battery pack, the frame structure also includes a bottom protective plate 3 located below the support plate 2, and a sheet metal support beam 4 is provided between the bottom protective plate 3 and the support plate 2. The sheet metal support beam 4 is welded between the support plate 2 and the bottom protective plate 3 to achieve the installation of the bottom protective plate. Based on the support scheme of the sheet metal support beam 4, on the one hand, the number of material parts is increased due to the need to add the sheet metal support beam 4; on the other hand, since the sheet metal support beam 4 needs to be welded between the support plate 2 and the bottom protective plate 3, an additional welding process is required, increasing the quality control points and correspondingly increasing the quality risk; at the same time, due to the large width of the sheet metal support beam and the number of welding points, the thermal deformation is serious, the stress concentration is aggravated, and the material performance is degraded, resulting in a heavier CTP battery pack and higher cost. Summary of the Invention
[0003] To address the aforementioned problems, this application provides a CTP battery pack housing structure to resolve the issues in the background art.
[0004] This application discloses a CTP battery pack housing structure, including: The base plate structure includes a support plate and a protective plate disposed on the lower side of the support plate. The support plate includes a panel portion, which has a support portion that contacts and connects to the battery cell and a recessed rib portion that extends toward and connects to the protective plate. The frame structure is connected to the base plate structure, and the frame structure and the base plate structure together form an assembly space for accommodating the battery cell.
[0005] By designing the support plate as a corrugated plate structure with support sections and concave ribs, the concave ribs directly assume the connection and support functions of the original sheet metal support beams, eliminating the need for additional independent sheet metal support beam parts and sheet metal support crossbeam parts. This significantly reduces the number of parts in the battery pack frame structure, lowers the overall weight of the enclosure structure, reduces dimensional mismatch errors between different parts, and improves the compatibility of enclosure assembly. Furthermore, as an integral structure of the support plate, the first connection of the concave ribs can be directly fixed to the protective plate through a single welding, unlike the sheet metal support beams which require two welding operations. At the same time, the structural design of the concave ribs makes the welding area more concentrated and the weld point layout more reasonable, greatly reducing the number of welding operations. The reduction in the number of welding operations directly corresponds to the reduction of quality control points, reducing the production risks caused by quality fluctuations at multiple weld points, reducing the manpower and time costs of quality inspection, and improving the stability and reliability of the production process.
[0006] Furthermore, the concave rib includes a first connecting portion that contacts and connects with the protective plate body, and a first ear portion that connects the first connecting portion and the support portion.
[0007] Furthermore, the first connecting portion extends along the surface of the protective plate, and the first connecting portion is welded to the protective plate.
[0008] Furthermore, the ratio of the width of the support portion to the width of the panel portion is greater than 70%.
[0009] Furthermore, the depth of the concave rib is 5mm to 10mm.
[0010] Furthermore, the support plate also includes an extension portion formed by extending outward from the outer edge of the panel portion.
[0011] Furthermore, the extension portion includes a flat plate portion disposed parallel to the protective plate body and a second ear portion connecting the flat plate portion and the panel portion, and the flat plate portion is disposed on the side of the panel portion away from the protective plate body.
[0012] Furthermore, the support plate also includes a second connecting portion formed by vertically extending the outer edge of the flat plate portion.
[0013] Furthermore, the frame structure is located on the outside of the extension portion and is connected to the support plate and the protective plate.
[0014] Furthermore, the support portion and the extension portion are integrally formed. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 A schematic diagram of the CTP battery pack housing structure in the prior art is shown; Figure 2 A schematic diagram of the box structure according to an embodiment of this application is shown; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view of section B in the middle.
[0017] 10. Support plate; 11. Panel; 110. Support; 111. Recessed rib; 111a. First connecting part; 111b. First ear; 12. Extension; 120. Flat plate; 121. Second ear; 13. Second connecting part; 20. Protective panel; 30. Frame structure; 40. Battery cell. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0019] A CTP (Cell to Pack) battery pack housing structure (hereinafter referred to as the housing) is used as the core load-bearing component of the CTP battery pack to achieve stable assembly and safety protection of the battery cells. In some examples, refer to... Figure 2The aforementioned housing structure consists of a base plate structure and a frame structure 30. The base plate structure and the frame structure 30 together enclose an assembly space for accommodating the battery cells. The size and shape of this assembly space are adapted to the overall specifications of the battery cells to be assembled, thus accommodating the battery cell assembly. During the battery cell assembly process, existing mature structural adhesive bonding technology is used to fix the battery cells inside the aforementioned assembly space, thereby completing the assembly of the entire CTP battery pack. In some examples, the frame structure 30 and the base plate structure are fixed using a rigid connection. For example, the connection between the frame structure 30 and the base plate structure can be solidified through welding processes, including but not limited to existing welding technologies such as arc welding and laser welding, to ensure that the connection between the frame structure 30 and the base plate structure is free of loosening and gaps, ensuring the overall rigidity of the housing structure. In some embodiments, the aforementioned base plate structure is a double-layer structure, including an upper support plate 10 and a protective plate 20 disposed below the support plate 10. The support plate 10 serves as the direct load-bearing component for the battery cell and is made of a rigid material such as HC340LA. The protective plate 20 primarily provides bottom protection, resisting damage to the internal battery cell caused by external impacts and collisions. (Refer to...) Figure 1 The aforementioned support plate 10 includes a panel portion 11 and an extension portion 12, wherein the extension portion 12 is formed by extending outward from the outer edge of the panel portion 11, and the panel portion 11 and the extension portion 12 are integrally formed to ensure the structural integrity of the support plate 10. At the same time, the upper surface of the panel portion 11 constitutes the assembly surface of the battery cell, that is, the battery cell is tightly attached and fixed to the panel portion 11 by adhesive materials such as structural adhesive to achieve a reliable connection between the battery cell and the base plate structure. Continue to refer to the appendix Figure 2 and combined Figure 3The aforementioned panel portion 11 has a support portion 110 that directly contacts the surface of the battery cell and a recessed rib portion 111 that extends toward and connects to the protective plate 20. The support portion 110 extends approximately horizontally and serves as a support surface for the battery cell; that is, the support portion 110 extends along the contour of the lower surface of the battery cell, ensuring that the bottom of the battery cell is fully fitted with the support portion 110. The battery cell is assembled and fixed by applying structural adhesive to the surface of the support portion 110. Correspondingly, the recessed rib portion 111 serves as a connection structure between the support plate 10 and the protective plate 20, and includes a first connecting portion 111a and a first ear portion 111b, wherein the first connecting portion 111a is... Extending along the surface of the protective plate 20, and fixed to the protective plate 20 by a reliable connection method such as welding, the welded parts must ensure uniform welds and no false welds to ensure connection strength. Correspondingly, the first ear 111b is configured as a connection structure between the support part 110 and the first connecting part 111a. For example, the first ear 111b adopts an inclined extension design, with one end smoothly connected to the lower surface of the support part 110 and the other end seamlessly connected to the edge of the first connecting part 111a, so that the entire concave rib 111 forms a cross-sectional structure similar to an isosceles trapezoid. The design of this isosceles trapezoid structure can improve the deformation resistance of the concave rib 111 itself. In some embodiments, the ratio of the width of the support portion 110 to the width of the panel portion 11 is greater than or equal to 70% (i.e., Figure 2 The ratio of L1, L2, and L3 to L is specified. This proportional design ensures that the support portion 110 has sufficient load-bearing width, providing stable and reliable support for the battery cell and preventing deformation caused by uneven stress on the battery cell due to insufficient support width. At the same time, the depth of the concave rib portion 111 (i.e., the vertical distance between the upper surface of the panel portion 11 and the upper surface of the protective plate 20) is 5mm to 10mm, achieving a perfect balance between structural strength, load-bearing capacity, and lightweight in the base plate structure. In some embodiments, refer to Figure 4The aforementioned extension portion 12 has a flat plate portion 120 and a second ear portion 121. The flat plate portion 120 is located on the side of the panel portion 11 away from the protective plate 20, i.e., the flat plate portion 120 is located above the panel portion 11, and the flat plate portion 120 and the panel portion 11 are smoothly connected via the second ear portion 121. The design of the second ear portion 121 avoids stress sharp angles at the connection point, improving the structural toughness of the extension portion 12. For example, the aforementioned first ear portion 111b is formed by extending obliquely outward from the outer edge of the panel portion 11, and its oblique angle matches the isosceles trapezoidal structure of the concave rib portion 111, ensuring a natural structural transition. Corresponding to the arrangement of the extension portion 12, the aforementioned frame structure 30 is disposed on the outside of the extension portion 12 and connected to the support plate 10 and the protective plate 20, further improving the connection stability between the frame structure 30 and the base plate structure. For example, the aforementioned support plate 10 also has an integrally formed second connecting portion 13, which is formed by extending vertically from the outer edge of the flat plate portion 120 (i.e., perpendicular to the surface direction of the flat plate portion 120). The second connecting portion 13 extends and fits along the inner side of the frame structure 30, and the two are fixedly connected by welding or other methods. That is, the second connecting portion 13 constitutes a connection structure between the support plate 10 and the frame structure 30, and it fully fits with the inner side of the frame structure 30, increasing the contact width and improving the connection strength. Correspondingly, the upper surface of the aforementioned protective plate 20 is flat and smooth, and constitutes the bottom support surface of the frame structure 30. The lower edge of the frame structure 30 fits tightly with the upper surface of the protective plate 20, forming a stable support relationship, further ensuring the overall load-bearing capacity of the box structure.
[0020] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A CTP battery pack housing structure, characterized in that, include: The base plate structure includes a support plate (10) and a protective plate (20) disposed on the lower side of the support plate (10). The support plate (10) includes a panel portion (11), which has a support portion (110) that contacts and connects to the battery cell and a concave rib portion (111) that extends toward the protective plate (20) and connects to the protective plate (20). The frame structure (30) is connected to the base plate structure, and the frame structure (30) and the base plate structure together form an assembly space for accommodating the battery cell.
2. The CTP battery pack housing structure according to claim 1, characterized in that, The recessed rib (111) includes a first connecting part (111a) that contacts and connects to the protective plate (20) and a first ear part (111b) that connects the first connecting part (111a) and the support part (110).
3. The CTP battery pack housing structure according to claim 2, characterized in that, The first connecting part (111a) extends along the surface of the protective plate (20), and the first connecting part (111a) and the protective plate (20) are welded together.
4. The CTP battery pack housing structure according to claim 1, characterized in that, The ratio of the width of the support portion (110) to the width of the panel portion (11) is greater than 70%.
5. The CTP battery pack housing structure according to claim 1, characterized in that, The depth of the concave rib (111) is 5mm to 10mm.
6. The CTP battery pack housing structure according to claim 1, characterized in that, The support plate (10) also includes an extension (12) formed by extending outward from the outer edge of the panel portion (11).
7. The CTP battery pack housing structure according to claim 6, characterized in that, The extension portion (12) includes a flat plate portion (120) disposed parallel to the protective plate body (20) and a second ear portion (121) connecting the flat plate portion (120) and the panel portion (11), and the flat plate portion (120) is disposed on the side of the panel portion (11) away from the protective plate body (20).
8. The CTP battery pack housing structure according to claim 7, characterized in that, The support plate (10) also includes a second connecting portion (13) formed by extending vertically from the outer edge of the flat plate portion (120).
9. A CTP battery pack housing structure according to claim 8, characterized in that, The frame structure (30) is located on the outside of the extension (12) and is connected to the support plate (10) and the protective plate (20).
10. A CTP battery pack housing structure according to claim 6, characterized in that, The support part (110) and the extension part (12) are integrally formed.