A heating device for cylindrical batteries

Abstract

The utility model discloses a kind of heating device of cylindrical battery, belong to cylindrical battery heating technical field;Including upper support and lower support, the upper support and lower support are oppositely provided with several uniform distribution and opposite electric core groove, electric core groove is equipped with electric core, each electric core is equipped with upper heating film and lower heating film between upper support and lower support, lower heating film and upper heating film middle part are equipped with opening;Directly with electric core by upper heating film and lower heating film and adhering contact, by heating simultaneously up and down, shorten heat transfer path, effective heating area is larger than the current heating film arrangement mode, improve heating efficiency and reduce the temperature difference of electric core cold and hot side, different electric core power density can also be adjusted according to temperature condition, and adaptability and adjustability are good.

Description

Technical Field

[0001] This utility model relates to a heating device for cylindrical batteries, belonging to the field of cylindrical battery heating technology. Background Technology

[0002] The low charge / discharge rate of lithium batteries in low-temperature environments directly impacts the user's charging and discharging experience, often resulting in excessively long charging times or insufficient driving range at low temperatures. To address this issue, heating films are a commonly used method for rapidly increasing the battery temperature, particularly for cylindrical battery packs without a water-cooling system.

[0003] Currently, the application of heating films for cylindrical battery cells mainly falls into three categories: bottom heating, side heating, and top bracket heating. However, all of these methods are single-sided heating, resulting in low heating efficiency and excessive temperature differences between the cold and hot sides. Existing single-sided bottom heating methods have very low heating efficiency, especially in low-temperature scenarios, where a significant amount of heat is dissipated by the air during the heating process from bottom to top. Side heating suffers from a small contact area between the heating film and the cylindrical surface, and assembly tolerances may even result in some cells not being in contact with the heating film, affecting the heating effect. Top bracket heating structures have the heating film on the outside of the bracket rather than facing the inside of the cell, and there is an assembly gap between the bracket and the cell, further reducing the heating film's efficiency. Therefore, designing a heating device for cylindrical batteries is essential. Utility Model Content

[0004] This invention addresses the shortcomings of the prior art by providing a heating device for a cylindrical battery.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0006] A heating device for a cylindrical battery includes an upper support and a lower support. The upper support and the lower support are provided with a plurality of uniformly distributed and oppositely arranged cell slots. A cell is provided in the cell slot. An upper heating film and a lower heating film are provided between each cell and the upper support and the lower support. An opening is provided in the middle of the lower heating film and the upper heating film.

[0007] Furthermore, each of the battery cell slots has a through hole at its center.

[0008] Furthermore, the opening and the through hole are the same size.

[0009] Furthermore, the size of the through hole is adapted to the battery cell terminal.

[0010] Furthermore, the position of the through hole is determined according to the welding area of ​​the explosion-proof valve or the bar sheet.

[0011] Furthermore, the cell slot has at least one positioning protrusion.

[0012] Furthermore, both the upper heating film and the lower heating film are provided with positioning holes corresponding to the positioning protrusions.

[0013] Furthermore, each of the battery cell slots has a wire harness clearance slot on its outer side.

[0014] Furthermore, the openings and through holes form a pressure relief and exhaust channel.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: by directly contacting the upper and lower heating films with the battery cell, and heating from both top and bottom simultaneously, the heat transfer path is shortened, and the effective heating area is larger than that of the existing heating film arrangement, which improves heating efficiency and reduces the temperature difference between the hot and cold sides of the battery cell. It can also adjust the power density of different battery cells according to the temperature, and has good adaptability and adjustability. By providing through holes on the upper and lower supports, and openings on the upper and lower heating films, the openings and through holes cooperate to avoid the battery cell poles, explosion-proof valves or welding areas of the valve plates, and reserve pressure relief and smoke exhaust channels. Attached Figure Description

[0016] Fig. 1 This is a schematic diagram of the structure of this utility model.

[0017] Fig. 2 This is a schematic diagram of the battery cell slot.

[0018] In the diagram, 1 is the upper bracket; 2 is the busbar; 3 is the upper heating film; 31 is the upper heating film harness; 4 is the battery cell; 5 is the lower heating film; 51 is the lower heating film harness; 6 is the lower bracket; 7 is the battery cell slot; 71 is the through hole; and 72 is the positioning protrusion. Detailed Implementation

[0019] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0020] like Figs. 1-2 As shown, the heating device for the cylindrical battery in this embodiment includes an upper support 1 and a lower support 6. The upper support 1 and the lower support 6 are provided with a plurality of uniformly distributed and oppositely arranged cell slots 7. Cells 4 are provided in the cell slots 7. Each cell 4 is provided with an upper heating film 3 and a lower heating film 5 between it and the upper support 1 and the lower support 6. The lower heating film 5 and the upper heating film 3 are provided with openings in the middle.

[0021] Each of the battery cell slots 7 has a through hole 71 at its center.

[0022] The opening and the through hole 71 are the same size.

[0023] The dimensions of the through hole 71 are adapted to the four terminals of the battery cell.

[0024] The position of the through hole 71 is determined according to the welding area of ​​the explosion-proof valve or the plate.

[0025] The cell slot 7 has at least one positioning protrusion 72.

[0026] Both the upper heating film 3 and the lower heating film 5 are provided with positioning holes corresponding to the positioning protrusions 72.

[0027] The outer side of each cell slot 7 is provided with a wire harness clearance slot, from which the upper heating film wire harness 31 and the lower heating film wire harness 51 are led out.

[0028] The opening and through hole 71 form a pressure relief and exhaust channel.

[0029] In use, first install the lower heating film 5 of the lower bracket 6. After the lower bracket 6 is positioned, grasp the terminal of the lower heating film harness 51 of the lower heating film 5, identify the positioning reference, i.e., the positioning protrusion 72, and then place it in the cell slot 7 in the lower bracket 6, ensuring that the hole of the lower heating film 5 is aligned with the positioning protrusion 72 in the cell slot 7 of the lower bracket 6. Slightly move it along the direction of the terminal of the lower heating film harness 51 until the wire of the lower heating film 5 is embedded in the cell slot of the lower bracket 6. Then, put the cell 4 into the lower bracket 6, and then use a hard plate to flatten and compact the cell 4 and the lower bracket 6 to ensure the flatness requirements. Then remove the hard plate and place it on the inner cylindrical surface of the lower bracket 6 (the part where the cell 4 contacts the lower bracket 6). Apply adhesive to solidify the battery cell 4 and the lower bracket 6 into one unit. The assembly sequence of the upper bracket 1 and the upper heating film 3 of the battery cell 4 is basically the same as that of the lower bracket 6, except that the battery cell 4 and the lower bracket 6 need to be inverted and placed inside the battery cell groove 7 of the upper bracket 1. The heating film wire harness of the heating film is guided by the wire harness avoidance groove on one side of the battery cell groove 7. The heating film wire harness runs through the gap of the battery cell 4 hole in the upper and lower brackets 6 of the battery cell 4, and then converges into the grooves on both sides of the upper and lower brackets 6 of the battery cell 4, and finally leads out the wiring to connect to the power supply. At this point, the upper heating film 3 and the lower heating film 5 of the battery cell 4 are in contact with the top and bottom of the cylindrical battery cell 4, respectively, and the outer sides of the upper heating film 3 and the lower heating film 5 are directly attached to the upper bracket 1 and the lower bracket 6.

[0030] The upper bracket 1 has a busbar 2 inside the housing to connect each battery cell 4; the upper heating film 3 and the lower heating film 5 can also be coated with adhesive on one side of the contact surface with the battery cell slot 7 so that the heating film can be attached to the inner side of the upper bracket 1 and the lower bracket 6 respectively for heating.

[0031] The upper heating film 3 and the lower heating film 5 are directly in contact with the battery cell 4. By heating from both the top and bottom simultaneously, the heat transfer path is shortened, and the effective heating area is larger than that of the existing heating film arrangement, which improves the heating efficiency, reduces the temperature difference between the hot and cold sides of the battery cell 4, and allows for adjustment of the power density of different battery cells 4 according to the temperature. The adaptability and adjustability are good. Through holes 71 are provided on the upper bracket 1 and the lower bracket 6, and openings are provided on the upper heating film 3 and the lower heating film 5. The openings and through holes 71 are matched to avoid the welding area of ​​the battery cell 4 pole, explosion-proof valve or bar plate, and a pressure relief and smoke exhaust channel is reserved.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heating device for a cylindrical battery, comprising an upper support (1) and a lower support (6), characterized in that: The upper support (1) and the lower support (6) are provided with a number of evenly distributed and oppositely arranged cell slots (7), and cell slots (7) are provided with cell (4). Each cell (4) is provided with an upper heating film (3) and a lower heating film (5) between it and the upper support (1) and the lower support (6). The lower heating film (5) and the upper heating film (3) are provided with openings in the middle.

2. The heating device for a cylindrical battery according to claim 1, characterized in that: Each of the battery cell slots (7) has a through hole (71) at its center.

3. The heating device for a cylindrical battery according to claim 2, characterized in that: The opening and the through hole (71) are the same size.

4. The heating device for a cylindrical battery according to claim 3, characterized in that: The size of the through hole (71) is adapted to the electrode post of the battery cell (4).

5. The heating device for a cylindrical battery according to claim 4, characterized in that: The position of the through hole (71) is determined according to the welding area of ​​the explosion-proof valve or the plate.

6. The heating device for a cylindrical battery according to claim 1, characterized in that: At least one positioning protrusion (72) is provided on the cell slot (7).

7. The heating device for a cylindrical battery according to claim 6, characterized in that: Both the upper heating film (3) and the lower heating film (5) are provided with positioning holes corresponding to the positioning protrusions (72).

8. The heating device for a cylindrical battery according to claim 1, characterized in that: The outer side of each cell slot (7) is provided with a wire harness clearance slot.

9. The heating device for a cylindrical battery according to claim 2, characterized in that: The opening and through hole (71) form a pressure relief and exhaust channel.

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