Lightweight heating structure of cylindrical power battery module

Abstract

The utility model relates to the technical field of power battery modules, in particular to a lightweight heating structure of a cylindrical power battery module, which comprises a battery module fixed in a bracket unit, the battery module comprises a support unit, a plurality of battery modules are arranged on the support unit, at least one side face of the support unit is fixedly provided with a heating unit, the heating unit is used for heating the axial plane of the battery module, and the heating unit is further provided with a pressure relief structure. The heating unit is used for axially heating the internal battery module, so that the heating effect on the internal cylindrical battery cell can be realized, in addition, the pressure relief structure is also arranged on the heating unit, so that the lightweight design can be realized, the arrangement structure is simple and reasonable in design, the weight grouping rate and the volume grouping rate of the module can be improved, and the production cost is reduced. And meanwhile, the cost can be reduced, the reliability, safety and heating efficiency of the module are improved, and the heating stability of the cylindrical power supply is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power battery modules, in particular to a lightweight heating structure for a cylindrical power battery module. Background Art

[0002] In the existing technology, the stacked design of the cylindrical power battery module results in a large number of unusable voids in the adjacent areas of the radial arc surface, thus reducing the volume grouping rate of the module. In addition, when discharging at a high rate in a low-temperature environment, the shape of the cylindrical battery brings design difficulties to the improvement of the grouping rate and heating efficiency of the module.

[0003] One of the common solutions in the market is to adopt a serpentine tube heating solution (radial heating solution), which fills the voids on the radial arc surface of the battery through the serpentine tube. However, this solution has problems such as an overly large heating source volume, a complex heating system, poor reliability and safety, and low heating efficiency due to the poor radial heat conduction performance of the cylindrical battery.

[0004] Another solution in the market is to use a serpentine heating film for heating (radial heating solution). Compared with the serpentine tube solution, it has improvements in terms of weight grouping rate, volume grouping rate, safety and reliability. However, this solution also has the problem of poor radial heat conduction performance of the cylindrical battery, thus affecting the heating efficiency.

[0005] Therefore, in the existing technology, there are certain limitations in the stacked design and heating solutions of the cylindrical power battery module, and a new stacked and heating solution for the cylindrical power battery module is urgently needed to solve these problems. Content of the Utility Model

[0006] The purpose of the utility model is to propose a lightweight heating structure for a cylindrical power battery module to solve the above-mentioned disadvantages in the existing technology.

[0007] To achieve the above purpose, the utility model adopts the following technical solutions:

[0008] Design a lightweight heating structure for a cylindrical power battery module, including:

[0009] A battery module fixed in a bracket unit;

[0010] A heating unit is fixed on at least one side of the bracket unit, and the heating unit is used to heat the axial plane of the battery module, and a pressure relief structure is also arranged on the heating unit.

[0011] Furthermore, the bracket unit includes an upper bracket and a lower bracket, and the battery module is fixed between the upper bracket and the lower bracket.

[0012] Furthermore, the battery module includes a plurality of cylindrical batteries, and the plurality of cylindrical batteries are connected in series and parallel through busbars.

[0013] Furthermore, placement holes are formed on the end faces of the upper bracket and the lower bracket, and the two ends of the cylindrical battery are respectively clamped in two opposite placement holes above and below.

[0014] Furthermore, there are two heating units, which are symmetrically distributed above and below the bracket unit.

[0015] Furthermore, the heating unit includes a heat-conducting pad covering the outer surface of the bracket unit, and a heating film is further arranged above the heat-conducting pad, and the heating film is connected to an external power supply to be energized.

[0016] Furthermore, it further includes heat-insulating cotton, and the heat-insulating cotton covers above the heating film.

[0017] Furthermore, the pressure relief structure is a pressure relief hole formed on the surfaces of the heat-conducting pad, the heating film and the heat-insulating cotton.

[0018] Furthermore, the pressure relief holes are a plurality of crescent-shaped holes, and every two crescent-shaped holes are in a group and are symmetrically arranged.

[0019] Furthermore, the heating area of the heating unit is not less than the supporting area of the bracket unit, and the wiring directions of the two heating units are opposite.

[0020] A lightweight heating structure of a cylindrical power battery module proposed by the present utility model has the beneficial effects that: in the present utility model, the structure of arranging two heating units in a planar manner on both sides of the bracket unit is used to realize the axial heating function of the internal battery module, so as to achieve the heating effect on the internal cylindrical battery cores. In addition, a pressure relief structure is also arranged on the heating unit, so as to achieve a lightweight design. The overall structure design is simple and reasonable, which can not only improve the weight grouping rate and volume grouping rate of the module, but also reduce the cost, increase the reliability, safety and heating efficiency of the module, and greatly improve the heating stability of the cylindrical power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional view of the present utility model;

[0022] Figure 2 is an exploded structural schematic diagram of the present utility model;

[0023] Figure 3 is Figure 2 the right view of

[0024] Figure 4This is a schematic structural diagram of the pressure relief structure of the present utility model.

[0025] In the figure: 1. Bracket unit; 11. Upper bracket; 12. Lower bracket; 2. Battery module; 21. Bus bar; 3. Heating unit; 31. Thermal conductive pad; 32. Heating film; 33. Thermal insulation cotton; 4. Pressure relief structure. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0027] Referring to Figures 1-4 , which is an embodiment of the present utility model, and discloses a lightweight heating structure for a cylindrical power battery module. Specifically, the battery module structure includes a battery module 2 fixed in a bracket unit 1;

[0028] A heating unit 3 is fixed on at least one side surface of the bracket unit 1. The heating unit 3 is used to heat the axial plane of the battery module 2, and a pressure relief structure 4 is further provided on the heating unit 3.

[0029] In some embodiments, in the present utility model, the bracket unit 1 includes an upper bracket 11 and a lower bracket 12. The battery module 2 is fixed between the upper bracket 11 and the lower bracket 12. These two parts cooperate with each other through structural design to form a stable support frame, ensuring that the battery module 2 can be firmly fixed between the upper bracket 11 and the lower bracket 12.

[0030] In addition, in this embodiment, the battery module 2 includes a plurality of cylindrical batteries. Of course, in order to realize the electrical connection between the cylindrical batteries, those skilled in the art know that the plurality of cylindrical batteries can be connected in series and parallel through a bus bar 21. Specifically, the bus bar 21 is a nickel sheet.

[0031] Furthermore, on the basis of the above embodiments, in the present utility model, placing holes are respectively opened on the end faces of the upper bracket 11 and the lower bracket 12. The two ends of the cylindrical battery are respectively clamped in the two opposite placing holes above and below. The placing holes should adopt a through-hole design so that the two ends of the cylindrical battery can protrude, realizing convenient connection with the bus bar 21. When the cylindrical battery is installed in the battery module 2, their two ends will be respectively clamped in the opposite placing holes of the upper bracket 11 and the lower bracket 12 appropriately. This design not only provides stable physical support for the battery, but also ensures the safety of the battery during operation, reducing the risk of movement that the battery may occur under severe vibration or impact.

[0032] In a preferred embodiment, two heating units 3 are provided in this embodiment and are symmetrically distributed above and below the bracket unit 1. By adopting the design of two heating units 3, heating can be simultaneously performed on the upper and lower sides of the battery, so as to improve the heating balance and comprehensiveness of the power battery module.

[0033] Specifically, in the embodiment of the present utility model, the heating unit 3 includes a heat conducting pad 31 covering the outer surface of the bracket unit 1. A heating film 32 is further provided above the heat conducting pad 31, and the heating film 32 is connected to an external power supply to be energized.

[0034] On the basis of the above embodiment, in this embodiment, in order to reduce the heat loss of the heating film 32 during heating, a heat insulating cotton 33 is further included. The heat insulating cotton 33 covers the heating film 32 to reduce heat dissipation.

[0035] In addition, in the embodiment of the present utility model, the pressure relief structure 4 is a pressure relief hole formed on the surfaces of the heat conducting pad 31, the heating film 32 and the heat insulating cotton 33. It should be noted that the pressure relief holes on the heat conducting pad 31, the heating film 32 and the heat insulating cotton 33 should be vertically and oppositely communicated. The design of the pressure relief holes ensures the lightweight design and high heat conduction efficiency of the module while improving its working safety.

[0036] In a preferred embodiment, the pressure relief holes in the present utility model are a plurality of crescent-shaped holes, and every two crescent-shaped holes are in a group and are symmetrically arranged.

[0037] Specifically, in the embodiment of the present utility model, the heating area of the heating unit 3 is not less than the supporting area of the bracket unit 1. Preferably, in this embodiment, the heating area of the heating unit 3 is the same as the supporting area of the bracket unit 1 to achieve a comprehensive heating effect. Among them, the wiring directions of the two heating units 3 are opposite.

[0038] In summary, in the present utility model, the structure of arranging two heating units 3 in a planar manner on both sides of the bracket unit 1 is used to realize the axial heating function of the internal battery module 2, so as to achieve the heating effect on the internal cylindrical battery cells. In addition, a pressure relief structure 4 is further provided on the heating unit 3, so as to realize the lightweight design. The overall structure design is simple and reasonable, which can not only improve the weight grouping rate and volume grouping rate of the module, but also reduce the cost, increase the reliability, safety and heating efficiency of the module, and greatly improve the heating stability of the cylindrical power supply.

[0039] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A lightweight heating structure for a cylindrical power battery module, characterized in that: include: A battery module (2) fixed in the bracket unit (1); A heating unit (3) is fixed on at least one side surface of the bracket unit (1), the heating unit (3) being used to heat the axial plane of the battery module (2), and a pressure relief structure (4) is also provided on the heating unit (3).

2. The lightweight heating structure of a cylindrical power battery module according to claim 1, characterized in that: The bracket unit (1) comprises an upper bracket (11) and a lower bracket (12), and the battery module (2) is fixed between the upper bracket (11) and the lower bracket (12).

3. The lightweight heating structure of a cylindrical power battery module according to claim 2, characterized in that: The battery module (2) comprises a plurality of cylindrical batteries, and the plurality of cylindrical batteries are connected in series or in parallel via a bus bar (21).

4. The lightweight heating structure of a cylindrical power battery module according to claim 3, characterized in that: The end surfaces of the upper bracket (11) and the lower bracket (12) are both provided with placement holes, and the two ends of the cylindrical battery are respectively clamped in two upper and lower opposite placement holes.

5. The lightweight heating structure of a cylindrical power battery module according to claim 1, characterized in that: Two heating units (3) are provided and are symmetrically distributed above and below the bracket unit (1).

6. The lightweight heating structure of a cylindrical power battery module according to claim 5, characterized in that: The heating unit (3) comprises a heat-conducting pad (31) covering the outer surface of the bracket unit (1), and a heating film (32) is also provided above the heat-conducting pad (31), and the heating film (32) is connected to an external power source to realize power supply.

7. The lightweight heating structure of a cylindrical power battery module according to claim 6, characterized in that: It also includes heat-insulating cotton (33), and the heat-insulating cotton (33) covers the top of the heating film (32).

8. The lightweight heating structure of a cylindrical power battery module according to claim 7, characterized in that: The pressure relief structure (4) is a pressure relief hole formed on the surface of the thermal pad (31), the heating film (32) and the thermal insulation cotton (33).

9. The lightweight heating structure of a cylindrical power battery module according to claim 8, characterized in that: The pressure relief holes are a plurality of crescent-shaped holes, and every two of the crescent-shaped holes form a group and are symmetrically arranged.

10. A lightweight heating structure for a cylindrical power battery module according to any one of claims 5 to 9, characterized in that: The heating area of ​​the heating unit (3) is not less than the supporting area of ​​the bracket unit (1), wherein the wiring directions of the two heating units (3) are opposite.

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