Support, battery module fixing structure and battery pack

Abstract

The utility model belongs to lithium ion battery technical field, concretely relates to a kind of support, battery module fixed structure and battery package, comprising: metal support main body, the metal support main body has for facing the front and back of battery module;At least two side flange edges, set in the side of the metal support main body, first connecting part for being connected with the battery module is provided on the side flange edge;At least one lower flange edge, set in the bottom of the metal support main body, second connecting part for being connected with battery box is provided on the lower flange edge;And insulating sheet, fixedly adhered to the front of the metal support main body.The utility model is by designing a kind of integrated side and lower flange edge metal support main body, and insulating sheet is fixed on its side facing battery cell, realizes the reliable bolted fixing between battery module and box in three directions.

Description

Technical Field

[0001] This utility model belongs to the field of lithium-ion battery technology, specifically relating to a bracket, a battery module fixing structure, and a battery pack. Background Technology

[0002] With the rapid development of the new energy vehicle industry, battery systems, as their core power source, have seen their safety, reliability, and economy become a focus of industry attention. Cylindrical battery cells, due to their advantages such as high energy density, good consistency, and mature manufacturing processes, have been widely used in passenger vehicles.

[0003] In battery pack assembly, the battery cells are first secured within a module consisting of upper and lower resin supports. Reliable securing of this module to the battery housing is crucial for ensuring the structural stability of the entire battery system during vehicle operation, especially under vibration and impact conditions. Currently, the industry commonly uses two main methods for securing cylindrical battery modules to the housing: One method involves injecting high thermal conductivity structural adhesive into a pre-set adhesive groove on the module's base plate, then bonding the entire module to the base plate using adhesive. While this method achieves a certain degree of fixation, it has significant drawbacks: First, the uniformity of adhesive application at different locations is difficult to control precisely, potentially leading to insufficient local bonding strength and affecting overall fixation reliability; second, the high cost of the thermally conductive structural adhesive (approximately 700-800 RMB / kg) significantly increases the battery pack manufacturing cost.

[0004] Another method involves wrapping the module's outer perimeter with steel straps (or metal cable ties) and then bolting the ends of the steel straps to mounting points on the housing. This method limits the module's displacement to some extent, but typically only provides constraint in two directions (such as the horizontal plane). It still requires adhesive application to certain areas of the base plate to prevent the module from shifting in the vertical or torsional directions. This not only fails to fundamentally solve the problem of high adhesive costs, but the additional steel straps and connectors also increase the weight of the battery pack, which is detrimental to improving the electric vehicle's driving range.

[0005] In addition, there are some improved solutions for fixing battery modules in the existing technology. For example, Chinese patent document CN202222314624.3 discloses a fixing structure for a cylindrical power battery module, which uses a fixing bracket with tenon and mortise connections to be fitted onto the end of the module for fixing. However, it is mainly applicable to scenarios where the battery cells are arranged vertically, and does not fully consider the necessary insulation protection between the metal bracket and the battery cells. Other patents (such as CN202510984891.7 and CN202422168506.5) mainly focus on the fixing method of the battery cells inside the module or the overall module structure design, rather than specifically optimizing the connection relationship between the module and the external casing.

[0006] In summary, the existing methods for fixing cylindrical battery modules to the housing still have shortcomings in terms of fixing reliability (full degree of freedom constraints), cost control, lightweighting, and safety (insulation protection). A more optimized, efficient, and safe fixing solution is urgently needed. Utility Model Content

[0007] The purpose of this utility model is to provide a bracket, a battery module fixing structure and a battery pack, which are extremely simple in structure, low in cost and reliable in fixing.

[0008] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides a bracket for fixing a cylindrical battery module, comprising: A metal support body having a front and a back for facing the battery module; At least two side flanges are provided on the side of the metal bracket body, and the side flanges are provided with a first connection portion for connecting to the battery module; At least one lower flange is disposed on the bottom edge of the metal bracket body, and the lower flange is provided with a second connecting portion for connecting to the battery box; and An insulating sheet is fixedly attached to the front side of the metal bracket body.

[0009] Preferably, the side flange and the lower flange are integrally formed on the metal bracket body through a flange structure, and the side flange and the lower flange are connected by spot welding at the fold.

[0010] Preferably, the first connecting part is a projection weld nut or a through hole provided on the side flange edge; the second connecting part is a through hole provided on the lower flange edge.

[0011] Preferably, the insulating sheet is a polycarbonate sheet and is fixed to the front side of the metal bracket body 1 by adhesive.

[0012] Preferably, the number of spot welds at the fold of the side flange edge and the lower flange edge is at least two.

[0013] Preferably, the metal bracket body is formed by stamping steel plate, and the thickness of the insulating sheet is not less than 1mm.

[0014] This utility model also discloses a battery module fixing structure, including a battery module having an upper resin support and a lower resin support, and further including the support. The side flange of the support is bolted and fixed to the upper resin support and / or the lower resin support by fasteners, so that the front of the support faces the battery cell of the battery module through the insulating sheet.

[0015] Preferably, the side flange is clamped and bolted between the upper resin bracket and the lower resin bracket.

[0016] This utility model also discloses a battery pack, including a battery box and a battery module disposed therein, and a battery module fixing structure, wherein the lower flange of the bracket is bolted and fixed to the battery box by fasteners.

[0017] Preferably, there are multiple brackets, symmetrically arranged on opposite sides of the battery module.

[0018] The beneficial effects of this utility model are as follows: By designing a metal bracket body integrating side and lower flange edges, and fixing an insulating sheet to the side facing the battery cell, this utility model achieves reliable bolt-on fixing between the battery module and the housing in three directions. This structure completely replaces the traditional glue or steel strip binding method, ensuring all-round constraint of the module, significantly improving connection rigidity and vibration safety, while avoiding the use of high-cost adhesives, reducing the number of parts and overall weight, which is beneficial for cost reduction and weight reduction of the battery pack. The setting of the insulating sheet fundamentally eliminates the risk of short circuit that may be caused by contact between the metal bracket and the battery cell, enhancing the electrical safety of the system. In addition, the bracket structure is simple, easy to manufacture using mature processes such as stamping and spot welding, easy to install, and has good versatility for various types of battery cell modules with standardized resin brackets. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the bracket provided in one embodiment of the present invention; Figure 2 yes Figure 1 The three-dimensional structural diagram of the bracket from another angle shows the rear structure. Figure 3 This is a three-dimensional assembly schematic diagram of the battery module fixing structure provided in one embodiment of the present invention; Figure 4 This is a three-dimensional assembly diagram of a battery pack (module fixed to the housing) provided in an embodiment of the present invention; Figure 5 This is a schematic diagram showing the vibration simulation analysis results of the structure of this utility model; Explanation of the labels in the diagram: 1: Metal bracket body; 2: Side flange edge; 21: Projection weld nut; 3: Lower flange edge; 31: Through hole; 4: Insulating sheet; 5: Spot weld point; 100: Battery module; 101: Battery cell; 102: Upper resin bracket; 103: Lower resin bracket; 200: Battery box body. Detailed Implementation

[0020] It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixed connection," and "fixed connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings and preferred embodiments.

[0024] Please see Figures 1 to 4 The following is a specific embodiment of the bracket, battery module fixing structure and battery pack for fixing cylindrical battery modules provided by this utility model.

[0025] In this embodiment, the bracket is mainly used to fix a horizontally arranged cylindrical battery module 100. The bracket mainly includes a metal bracket body 1, a side flange 2, a lower flange 3, and an insulating sheet 4.

[0026] The metal bracket body 1 is preferably made of high-strength steel plate and integrally formed by stamping process to form a roughly plate-shaped structure. The plate thickness can be selected in the range of 1.0 mm to 2.5 mm according to the required mechanical strength. The metal bracket body 1 has a relatively flat front (i.e. the side facing the battery cell 101 in the figure) and a back.

[0027] The side flange 2 and lower flange 3 are flanged structures formed by folding the corresponding edges of the metal bracket body 1 outward at approximately 90 degrees. Specifically, a side flange 2 is formed on each of the two sides of the metal bracket body 1, and a lower flange 3 is formed on its bottom edge. To ensure the structural strength and overall rigidity after flanged construction, spot welding is performed at the folding corners (i.e., the intersections of the folding lines) where each side flange 2 and lower flange 3 intersects. Preferably, at least two weld points 5 are provided, such as... Figure 1 and Figure 2 As shown in the middle section. This spot welding connection method is simple, reliable, and provides high connection strength.

[0028] A first connecting portion is provided on the side flange edge 2 for connecting to the battery module 100. In a preferred embodiment, the first connecting portion is a plurality of (e.g., six shown in the figure) projection-welded nuts 21, which are pre-welded and fixed to corresponding positions on the side flange edge 2 after the stamping process. In other embodiments, the first connecting portion may also be a directly formed through hole, connected by bolts and nuts.

[0029] A second connecting portion is provided on the lower flange edge 3 for connecting to the battery box 200. The second connecting portion preferably has multiple (e.g., three as shown in the figure) through holes 31 for bolts to pass through.

[0030] The insulating sheet 4 is fixedly attached to the front side of the metal bracket body 1. The insulating sheet 4 is preferably made of polycarbonate (PC) sheet with good insulation, flame retardancy, and heat resistance. Its thickness is determined according to the design gap between the surface of the battery cell 101 and the front side of the metal bracket body 1, but to ensure reliable insulation and structural support, a thickness of not less than 1.0 mm is recommended. The insulating sheet 4 is smoothly adhered to the front side of the metal bracket body 1 using thermally conductive double-sided adhesive or high-performance structural adhesive, ensuring complete coverage of the metal surface and preventing any metal parts from being directly exposed to one side of the battery cell 101.

[0031] Figure 3 and Figure 4This demonstrates the application of the aforementioned bracket in the battery module fixing structure and battery pack. The battery module 100 is assembled from multiple cylindrical cells 101, an upper resin bracket 102, and a lower resin bracket 103. During installation, the side flange 2 of the bracket is inserted and clamped into the gap between the upper resin bracket 102 and the lower resin bracket 103 of the battery module 100. Subsequently, bolts are sequentially passed through the mounting holes on the upper resin bracket 102, the projection-welded nuts 21 (or through holes) on the side flange 2, and the corresponding mounting holes on the lower resin bracket 103, and tightened to securely fasten the bracket to the side of the battery module 100. At this time, the front of the bracket (i.e., the side with the insulating sheet 4 attached) is parallel to the cylindrical surface of the cell 101 and maintains a small safety gap. The insulating sheet 4 effectively prevents short circuits caused by contact between the metal bracket body 1 and the cell 101 housing due to vibration or assembly errors.

[0032] Finally, the battery module 100 with the bracket installed is placed into the battery housing 200. After adjusting the position, bolts are passed through the through holes 31 on the lower flange edge 3 of the bracket and screwed into the pre-set threaded holes or connecting nuts on the bottom plate of the battery housing 200, thereby finally fixing the entire battery module 100 into the battery housing 200. Typically, two identical brackets of this type are symmetrically installed on opposite sides of the battery module 100 to achieve full constraint of the module's freedom in the X, Y, and Z directions, resulting in a stable and reliable fixation.

[0033] Figure 5 The vibration simulation analysis results shown (overall and local stress cloud diagrams of the support) indicate that, with the fixing method of this structure, the strain at the connection between the support and the box is minimal, the stress distribution is uniform, and the overall rigidity fully meets the vibration and impact requirements under vehicle driving conditions.

[0034] The bracket structure of this utility model is not limited to the specific dimensions and number of connection holes in the above embodiments. Its core lies in achieving multi-directional bolting through integrated side and lower flange edges, and adding an insulating sheet to ensure safety. This bracket structure is also applicable to other types of battery modules (such as square hard-shell and soft-pack modules) that use similar upper and lower resin bracket structures, after adaptive dimensional adjustments. The material of the metal bracket can also be replaced with aluminum alloy or other alloys depending on cost and strength requirements. Any equivalent substitutions or simple modifications to the structure, materials, or processes using the concept of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. A bracket for fixing a cylindrical battery module, characterized in that, include: Metal bracket body (1) having a front and a back for facing the battery module; At least two side flange edges (2) are provided on the side of the metal bracket body (1), and the side flange edges (2) are provided with a first connecting part for connecting with the battery module; At least one lower flange edge (3) is disposed on the bottom edge of the metal bracket body (1), and the lower flange edge (3) is provided with a second connecting part for connecting to the battery box body; and An insulating sheet (4) is fixedly attached to the front side of the metal bracket body (1).

2. The bracket according to claim 1, characterized in that, The side flange edge (2) and the lower flange edge (3) are integrally formed on the metal bracket body (1) through a flange structure, and the side flange edge (2) and the lower flange edge (3) are connected by spot welding at the fold.

3. The stent according to claim 1 or 2, characterized in that, The first connecting part is a projection weld nut (21) or a through hole provided on the side flange edge (2); the second connecting part is a through hole (31) provided on the lower flange edge (3).

4. The bracket according to claim 1, characterized in that, The insulating sheet (4) is a polycarbonate sheet and is fixed to the front of the metal bracket body (1) by adhesive.

5. The bracket according to claim 2, characterized in that, The number of spot welds at the fold of the side flange edge (2) and the lower flange edge (3) is at least two.

6. The bracket according to claim 1, characterized in that, The metal bracket body (1) is formed by stamping steel plate, and the thickness of the insulating sheet (4) is not less than 1mm.

7. A battery module fixing structure, comprising a battery module (100), the battery module (100) having an upper resin support (102) and a lower resin support (103), characterized in that, It also includes a bracket as described in any one of claims 1-6, wherein the side flange edge (2) of the bracket is bolted and fixed to the upper resin bracket (102) and the lower resin bracket (103) by fasteners, such that the front of the bracket faces the cell (101) of the battery module (100) through the insulating sheet (4).

8. The battery module fixing structure according to claim 7, characterized in that, The side flange edge (2) is clamped and bolted between the upper resin bracket (102) and the lower resin bracket (103).

9. A battery pack, comprising a battery housing (200) and a battery module (100) disposed therein, characterized in that, It also includes the battery module fixing structure as described in claim 7 or 8, wherein the lower flange edge (3) of the bracket is bolted to the battery box (200) by fasteners.

10. The battery pack according to claim 9, characterized in that, Multiple brackets are symmetrically arranged on opposite sides of the battery module (100).

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