Automobile battery assembly

Abstract

The utility model discloses an automobile battery assembly, which is positioned between a lower base film and an upper base film and is provided with a plurality of heating units corresponding to battery cells along the length direction, each heating unit comprises a plurality of second metal wires arranged in parallel, a first spacing area is arranged between every two adjacent second metal wires, and the second metal wires are connected end to end; a second spacer region is arranged between every two adjacent heating units, the width of the second spacer region is larger than that of the first spacer region, the surface of the second metal wire is coated with an insulating layer, at least two first through holes are formed in the lower base film and the upper base film at intervals in the length direction, at least two second through holes are formed in the lower base film and the upper base film at intervals in the width direction, and the insulating layer is coated with an insulating layer. The first through hole and the second through hole are located in the peripheral area of the heating unit. According to the utility model, the decrease of the heating value of the heating film and uneven heating caused by short circuit due to mutual contact between metal wires are avoided, the binding force between the base film and the automobile battery assembly is also improved, and the stability of heat transfer is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an automobile battery assembly. Background Art

[0002] At present, power batteries are composed of power battery packs through different battery cells connected in series and parallel. The performance of power batteries is very sensitive to temperature. Studies have shown that the optimal operating temperature range is between 20°C and 40°C. When working at high temperatures, active chemicals may undergo irreversible reactions, thereby destroying the battery; when working at low temperatures, the lithium battery will cause lithium deposition at the anode, resulting in a permanent reduction in battery capacity. Therefore, in the prior art, power batteries are thermally managed, and the battery is cooled when the operating temperature is high, and heated when the workstation temperature is low, so that the battery operating temperature is maintained within an appropriate range.

[0003] In the prior art, an electric heating circuit with a plurality of heating wires is arranged between power batteries. By electrically connecting the electric heating circuits, the battery cells of the power battery assembly are kept warm. However, during the use of the battery, it is difficult to avoid the internal expansion of the battery due to heat, and the expansion stress can easily cause the position of the heating wire to shift, thereby affecting the reliability and uniformity of the insulation. Summary of the invention

[0004] The purpose of the utility model is to provide an automobile battery assembly, which not only avoids the decrease in heat generation and uneven heating of the heating film caused by short circuit between metal wires, but also improves the bonding strength between the base film and the automobile battery assembly, ensuring the stability of heat transfer.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an automobile battery assembly, comprising: an input end, an output end and a plurality of battery cells arranged in parallel, a lower base film and an upper base film are stacked on the lower surface or side surface of the plurality of battery cells, a plurality of heating units corresponding to the battery cells are arranged between the lower base film and the upper base film and along the length direction, adjacent heating units are electrically connected through a first metal wire, and the heating units located at both ends of the lower base film and the upper base film respectively have an input interface area electrically connected to the input end and an output interface area electrically connected to the output end;

[0006] The heating unit includes a plurality of second metal wires arranged in parallel, with a first spacing area between adjacent second metal wires and connected end to end, a second spacing area between adjacent heating units, the width of the second spacing area is greater than the width of the first spacing area, the surface of the second metal wire is coated with an insulating layer, at least two first through holes are opened on the lower base film and the upper base film at intervals in the length direction thereof, at least two second through holes are opened on the lower base film and the upper base film at intervals in the width direction thereof, and the first through holes and the second through holes are located in the peripheral area of ​​the heating unit.

[0007] The further improved scheme in the above technical scheme is as follows:

[0008] 1. In the above solution, the first through holes are respectively located on both sides of the heating unit and are staggered.

[0009] 2. In the above solution, the first through holes are distributed at equal intervals.

[0010] 3. In the above solution, the second through holes are distributed at equal intervals.

[0011] 4. In the above solution, the input interface area and the output interface area are located on the lower base film or the upper base film.

[0012] 5. In the above solution, the diameter of the first metal wire is the same as that of the second metal wire.

[0013] 6. In the above solution, an adhesive layer is provided on the surface of the first metal wire and the second metal wire.

[0014] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0015] The utility model automobile battery assembly, the heating unit of which includes a plurality of second metal wires arranged in parallel, the adjacent heating units are electrically connected through the first metal wires, the surface of the second metal wires of the heating units is coated with an insulating layer, the adjacent second metal wires are connected end to end, thereby avoiding short circuit caused by contact between the first metal wire and the second metal wire, and between adjacent second metal wires, especially the increased risk of metal wire contact caused by alternating hot and cold, resulting in reduced heating value and uneven heating of the heating film, thereby improving the uniformity and reliability of heating of the electric heating film; in addition, it realizes accurate matching of the lower base film, the upper base film and the battery cell position by providing at least two first through holes spaced apart in the length direction of the lower base film and the upper base film and at least two second through holes spaced apart in the width direction, while also reducing the position offset between the battery cell and the lower base film and the upper base film under expansion stress, thereby improving the bonding strength of the base film and the automobile battery assembly, thereby ensuring the stability of heat transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 This is a schematic diagram of the overall structure of the automobile battery assembly of the utility model;

[0017] Attached Figure 2 It is a schematic diagram of the three-dimensional structure of the upper base film of the utility model;

[0018] Attached Figure 3 It is a partial structural schematic diagram of the automobile battery assembly of the utility model;

[0019] Attached Figure 4 It is a cross-sectional schematic diagram of the second metal wire of the utility model.

[0020] In the above figures: 100, battery cell; 1, heating unit; 101, second metal wire; 2, input end; 3, input interface area; 4, output interface area; 5, first metal wire; 6, output end; 71, first through hole; 72, second through hole; 8, lower base film; 9, upper base film; 10, first spacer area; 11, second spacer area; 12, adhesive layer; 13, insulating layer. DETAILED DESCRIPTION

[0021] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0022] Embodiment 1: An automotive battery assembly, comprising: an input terminal 2, an output terminal 6 and a plurality of battery cells 100 arranged in parallel, a lower base film 8 and an upper base film 9 are stacked on the lower surface or side surface of the plurality of battery cells, a plurality of heating units 1 corresponding to the battery cells 100 are arranged between the lower base film 8 and the upper base film 9 and along the length direction, adjacent heating units 1 are electrically connected through a first metal wire 5, and the heating units 1 located at both ends of the lower base film 8 and the upper base film 9 respectively have an input interface area 3 electrically connected to the input terminal 2 and an output interface area 4 electrically connected to the output terminal 6;

[0023] The heating unit 1 comprises a plurality of second metal wires 101 arranged in parallel, a first spacing area 10 is provided between adjacent second metal wires 101 and the wires are connected end to end, and a second spacing area 11 is provided between adjacent heating units 1, and the width of the second spacing area 11 is greater than the width of the first spacing area 10;

[0024] The surface of the second metal wire 101 is coated with an insulating layer; at least two first through holes 71 are opened on the lower base film 8 and the upper base film 9 at intervals in the length direction thereof, and at least two second through holes 72 are opened on the lower base film 8 and the upper base film 9 at intervals in the width direction thereof, and the first through holes 71 and the second through holes 72 are located in the peripheral area of ​​the heating unit 1.

[0025] The first through holes 71 are respectively located on two sides of the heating unit 1 and are staggeredly distributed.

[0026] The second through holes 72 are distributed at equal intervals.

[0027] The above-mentioned input interface area 3 and output interface area 4 are located on the lower base film 8 .

[0028] An adhesive layer 12 is disposed on the surfaces of the first metal wire 5 and the second metal wire 101 .

[0029] The lower base film 8 is a PET film, and the upper base film 9 is a PET film.

[0030] The diameter of the first metal wire 5 is 15 μm.

[0031] The diameters of the first metal wire 5 and the second metal wire 101 are the same.

[0032] The battery cell 100 has protrusions that can be embedded in the first through hole 71 and the second through hole 72 .

[0033] Embodiment 2: An automotive battery assembly, comprising: an input terminal 2, an output terminal 6 and a plurality of battery cells 100 arranged in parallel, a lower base film 8 and an upper base film 9 are stacked on the lower surface or side surface of the plurality of battery cells, and a plurality of heating units 1 corresponding to the battery cells 100 are arranged between the lower base film 8 and the upper base film 9 and along the length direction;

[0034] Adjacent heating units 1 are electrically connected via first metal wires 5, and the heating units 1 located at both ends of the lower base film 8 and the upper base film 9 respectively have an input interface area 3 electrically connected to the input end 2 and an output interface area 4 electrically connected to the output end 6; the heating unit 1 includes a plurality of second metal wires 101 arranged in parallel, and a first spacing area 10 is provided between adjacent second metal wires 101 and connected end to end;

[0035] There is a second spacing area 11 between adjacent heating units 1, and the width of the second spacing area 11 is greater than that of the first spacing area 10. The surface of the second metal wire 101 is coated with an insulating layer. At least two first through holes 71 are opened at intervals in the length direction of the lower base film 8 and the upper base film 9, and at least two second through holes 72 are opened at intervals in the width direction of the lower base film 8 and the upper base film 9. The first through holes 71 and the second through holes 72 are located in the peripheral area of ​​the heating unit 1.

[0036] The first through holes 71 are distributed at equal intervals. The second through holes 72 are distributed at equal intervals.

[0037] The above-mentioned input interface area 3 and output interface area 4 are located on the upper base film 9 .

[0038] The lower base film 8 and the upper base film 9 are both PI films.

[0039] The diameter of the second metal wire 101 is 300 μm.

[0040] The diameters of the first metal wire 5 and the second metal wire 101 are the same.

[0041] When the above-mentioned automotive battery assembly is used, it avoids short circuits caused by contact between the first metal wire and the second metal wire, and between adjacent second metal wires, and especially the increased risk of metal wire contact due to alternating hot and cold, resulting in a decrease in the heating value of the heating film and uneven heating, thereby improving the uniformity and reliability of the heating of the electric heating film; in addition, it achieves precise matching of the positions of the lower base film, the upper base film and the battery cell by providing at least two first through holes spaced apart in the length direction of the lower base film and the upper base film, and at least two second through holes spaced apart in the width direction, while also reducing the positional offset between the battery cell and the lower base film and the upper base film under expansion stress, thereby improving the bonding strength between the base film and the automotive battery assembly, thereby ensuring the stability of heat transfer.

[0042] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An automotive battery assembly, comprising: An input terminal (2), an output terminal (6) and a plurality of battery cells (100) arranged in parallel, characterized in that: a lower base film (8) and an upper base film (9) are stacked on the lower surface or side surface of the plurality of battery cells, a plurality of heating units (1) corresponding to the battery cells (100) are arranged between the lower base film (8) and the upper base film (9) and along the length direction, adjacent heating units (1) are electrically connected via a first metal wire (5), and the heating units (1) located at both ends of the lower base film (8) and the upper base film (9) respectively have an input interface area (3) electrically connected to the input terminal (2) and an output interface area (4) electrically connected to the output terminal (6); The heating unit (1) comprises a plurality of second metal wires (101) arranged in parallel, a first spacing area (10) being provided between adjacent second metal wires (101) and being connected end to end, a second spacing area (11) being provided between adjacent heating units (1), the width of the second spacing area (11) being greater than the width of the first spacing area (10), the surface of the second metal wire (101) being coated with an insulating layer, at least two first through holes (71) being provided at intervals in the length direction of the lower base film (8) and the upper base film (9), at least two second through holes (72) being provided at intervals in the width direction of the lower base film (8) and the upper base film (9), the first through holes (71) and the second through holes (72) being located in the peripheral area of ​​the heating unit (1).

2. The automotive battery assembly according to claim 1, characterized in that: The first through holes (71) are respectively located on two sides of the heating unit (1) and are distributed in a staggered manner.

3. The automotive battery assembly according to claim 1, characterized in that: The first through holes (71) are distributed at equal intervals.

4. The automotive battery assembly according to claim 1, characterized in that: The second through holes (72) are distributed at equal intervals.

5. The automotive battery assembly according to claim 1, characterized in that: The input interface area (3) and the output interface area (4) are located on the lower base film (8) or the upper base film (9).

6. The automotive battery assembly according to claim 1, characterized in that: The first metal wire (5) and the second metal wire (101) have the same diameter.

7. The automotive battery assembly according to claim 1, characterized in that: An adhesive layer (12) is provided on the surfaces of the first metal wire (5) and the second metal wire (101).

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