Battery pack structure using PTC (Positive Temperature Coefficient) heating film

Abstract

The utility model relates to a battery pack structure using PTC (Positive Temperature Coefficient) heating films, which comprises a box body, battery pack modules are arranged in the box body, each battery pack module is provided with a PTC heating film to assist in working, and the PTC heating films are electrically connected in parallel; a hollow groove is formed in the box body; and the box body is integrally provided with an extending convex edge. The internal resistance of the PTC heating film used by the utility model can be increased along with the temperature rise, so that the over-temperature protection can be automatically realized, the thermal runaway of the battery caused by the failure of a heating loop is avoided, and the PTC heating film is used in parallel during connection due to the characteristics of the PTC heating film, so that the service life of the battery is prolonged. According to the battery pack box, connection of external wire harnesses can be greatly simplified under the condition that a plurality of battery packs work in a matched mode, follow-up quick assembly, disassembly and daily maintenance are facilitated, in addition, auxiliary installation bosses, auxiliary installation supports and water cooling plates reserved with a plurality of rows of rubber strips are arranged to conduct auxiliary reinforcing assembly on all parts arranged in the box body, and therefore the assembling efficiency of the battery pack box is improved. Therefore, the working stability of the device is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery packs, and in particular relates to a battery pack structure using a PTC heating film. Background Art

[0002] The battery pack is an important part of electric vehicles. The battery pack provides a power source for electric vehicles, and then provides electric energy for electric vehicles. The battery pack box is a component of the battery pack. The battery pack box not only protects the battery pack cells, but also provides an installation base for the battery pack so that the battery pack can be stably installed in the electric vehicle. Therefore, the design of the battery pack box also needs to consider the weight to avoid excessive weight and bring additional energy consumption to the electric vehicle.

[0003] At present, there is still room for improvement in the structure of the battery pack. It is hoped that the internal space can be reasonably used to arrange the circuits and modules while reducing the overall volume and weight. It also needs to have a certain strength to meet normal stacking and daily use. In addition, there is a better choice for the resistance wire heating film used in the existing battery pack, namely the PTC heating film, which can automatically achieve over-temperature protection, so it is necessary to develop a battery pack structure that solves the above problems to obtain a better user experience. Utility Model Content

[0004] In order to solve the above problems, the utility model adopts the following technical solutions:

[0005] A battery pack structure using a PTC heating film includes a box body, characterized in that a battery pack module is arranged in the box body, each group of battery pack modules is configured with a PTC heating film to assist work, and the PTC heating films are electrically connected to each other by parallel connection; a hollow groove is opened in the box body; and the box body is integrally formed with an extended convex edge design.

[0006] Preferably, a water cooling plate is laid on the bottom of the box body, and an auxiliary bracket is fixed on the water cooling plate, and a plurality of internal thread screw holes are opened on the auxiliary bracket.

[0007] Preferably, a plurality of rows of rubber strips are preset on the water cooling plate.

[0008] Preferably, the front panel of the box body is integrally formed with an auxiliary boss by wire cutting to provide the joint for fixed and sealed assembly.

[0009] Preferably, the box body is made of pure metal material, and the upper surface and the lower surface are both purely flat designs that can be stacked.

[0010] Preferably, the water-cooling plate is an integrated water-cooling plate with an aluminum alloy joint.

[0011] Preferably, the bracket configured in the box body is provided with an insulating gasket to assist the connection and assembly of the acquisition board for insulation protection and heat dissipation.

[0012] Compared with the prior art, the advantages of the present invention are:

[0013] 1. Compared with the resistance wire heating film used in the traditional battery pack, the internal resistance of the PTC heating film used in the utility model will increase with the increase of temperature. This function can automatically realize over-temperature protection to prevent thermal runaway of the battery. Due to the characteristics of the PTC heating film, it is used in parallel when connected. The heating circuit that works with the PTC heating film in the utility model adopts a parallel structure, which can greatly simplify the connection of the external wiring harness, so as to facilitate the subsequent quick assembly and disassembly and daily maintenance;

[0014] 2. The utility model reduces the overall weight by hollowing out, but such a design does not mean a reduction in strength. The utility model is made of pure metal materials, and the box body is integrally formed with an extended convex edge design. The protruding design of this part can enable the utility model to obtain higher compressive strength when stacked than the flat vertical surface design, avoiding deformation of the box body caused by extrusion during stacking;

[0015] 3. In order to strengthen the stable assembly of internal circuits, modules and electrical components, the utility model is provided with auxiliary bosses, auxiliary brackets and a water-cooling plate with multiple rows of rubber strips reserved to perform auxiliary reinforcement assembly of various components arranged inside the box, so that the utility model has better stability and can stabilize the position even in the shaking state during driving to obtain an ideal working effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the overall assembly diagram of the utility model;

[0017] Figure 2 and Figure 3 This is a schematic diagram of the internal structure of the box of the utility model;

[0018] Figure 4 A schematic diagram of the arrangement of the battery pack module equipped with a PTC heating film in the box of the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the utility model provided with a parallel interface of a heating harness;

[0020] Figure 6 It is a schematic diagram of assembling a bracket equipped with an insulating gasket according to the utility model;

[0021] Figure 7 for Figure 6 A partial enlarged exploded view of point A in the middle. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figures 1 to 4 As shown, the utility model is a battery pack structure using a PTC heating film, which is mainly composed of a box body (1) and a battery pack module (2), a PTC heating film (3) and a water cooling plate (4) arranged inside the box body (1). An integrated water cooling plate with an aluminum alloy joint is fixedly arranged at the bottom of the box body (1), and the upper surface of the water cooling plate (4) is preset with multiple rows of rubber strips (42) and an auxiliary bracket (40) to reinforce the positioning and installation of the battery pack module (2) equipped with the PTC heating film (3) and other components, wherein the auxiliary bracket (40) is provided with multiple internal thread screw holes (41), which can be used to further reinforce electrical components such as BDU board brackets by using screws, so that the utility model has better stability and can stabilize the position even in a shaking state during driving to obtain an ideal working effect. The same effect can also be achieved in the front panel (100) of the box body (1). The inner wall surface of the front panel (100) is integrally formed with an auxiliary boss (12) by wire cutting to provide the joint for fixed and sealed assembly. Compared with the previous welding boss for positioning and assembling the joint, the integrally formed auxiliary boss (12) cut on the plate with a certain thickness is undoubtedly stronger and can provide better wrapping and strength for the assembled interface.

[0024] An insulating gasket (13) is provided between the collection plate (14) and the bracket (15) in the box (1) to assist in the connection and assembly of the two. The provision of the insulating thermal pad can achieve the working requirements of insulation protection and auxiliary heat conduction, thereby improving safety while increasing the working efficiency of heat conduction.

[0025] like Figure 4 and Figure 5 As shown, the utility model adopts a PTC heating film (3) to replace the more commonly used resistance wire heating film. The internal resistance of the PTC heating film (3) will increase with the increase of temperature. This function can automatically realize over-temperature protection to prevent thermal runaway of the battery. Due to the characteristics of the PTC heating film, it is used in parallel when connected. The battery pack structure is also designed with a heating harness parallel interface (16) to greatly simplify the connection of the external harness when multiple battery packs work together, so as to facilitate subsequent quick assembly and disassembly and daily maintenance.

[0026] like Figure 6 and Figure 7 As shown, the bracket (15) configured in the box (1) of the utility model is provided with an insulating gasket (13) to assist the collection board (14) in the connection and assembly for insulation and heat dissipation. Since the collection board (14) will also generate heat during operation, the addition of the insulating gasket (13) can play a role in assisting heat dissipation. In addition, the insulating gasket (13) is more conducive to safety and can extend the life of the collection board (14) to a certain extent, and also directly improve the practicality and durability of the utility model.

[0027] It is worth mentioning that the utility model reduces the overall weight by hollowing out. The hollow groove (10) is not a through groove, but a groove with a certain depth. Although there are multiple hollow grooves (10) inside, this does not mean a reduction in strength. Because the utility model is made of pure metal material, and the box body is integrally formed with an extended convex edge design (11), based on the fact that the box body (1) of the utility model can be stacked to reduce the space occupied during transportation, placement or work, the protruding design of this part can enable the utility model to obtain higher compressive strength when stacked than a purely flat vertical surface design, thereby avoiding deformation of the box body caused by extrusion during stacking.

[0028] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description of reference terms "one scheme", "some schemes", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more schemes or examples.

Claims

1. A battery pack structure using a PTC heating film, comprising a box (1), characterized in that: A battery pack module (2) is arranged in the box (1), each battery pack module (2) is equipped with a PTC heating film (3) to assist operation, and the PTC heating films are electrically connected to each other by being connected in parallel; a hollow groove (10) is provided in the box (1); and the box (1) is integrally formed with an extended convex edge design (11).

2. A battery pack structure using a PTC heating film according to claim 1, characterized in that: A water cooling plate (4) is provided at the bottom of the box body (1), and an auxiliary bracket (40) is provided on the water cooling plate (4), wherein a plurality of internal thread screw holes (41) are provided on the auxiliary bracket (40).

3. A battery pack structure using a PTC heating film according to claim 2, characterized in that: The water cooling plate (4) is preset with multiple rows of rubber strips (42).

4. A battery pack structure using a PTC heating film according to claim 1, characterized in that: The front panel (100) of the box body (1) is integrally formed with an auxiliary boss (12) by wire cutting to provide a fixed and sealed assembly for the joint.

5. A battery pack structure using a PTC heating film according to claim 1, characterized in that: The box body (1) is made of pure metal material, and the upper surface and the lower surface are both of a pure flat design that can be stacked.

6. A battery pack structure using a PTC heating film according to claim 2, characterized in that: The water cooling plate (4) is an integrated water cooling plate with an aluminum alloy joint.

7. A battery pack structure using a PTC heating film according to claim 1, characterized in that: The bracket (15) arranged in the box (1) is provided with an insulating gasket (13) to assist the connection and assembly of the collection board (14) for insulation protection and heat dissipation.

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