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CN-122000561-A - Battery device and electricity utilization device

CN122000561ACN 122000561 ACN122000561 ACN 122000561ACN-122000561-A

Abstract

The application discloses a battery device and an electricity utilization device. The battery device comprises a box body, a battery unit component and a heating component. The battery cell assembly is located in the accommodating space, and the battery cell assembly comprises a plurality of battery cells arranged along a first direction, and the first direction is intersected with the height direction of the box body. The heating component is located accommodation space to locate between the diapire of battery cell subassembly and box, heating component is including generating heat piece and inoxidizing coating, follows the direction of height of box, and the both sides of generating heat piece are equipped with the inoxidizing coating respectively, and the inoxidizing coating interconnect of the both sides of generating heat piece. The protective layer of the heating element plays a role in protecting the heating element, and can prevent the metal foreign matters from piercing the heating element, so that the probability of damage of the heating element is reduced, and the working reliability of the heating element is improved.

Inventors

  • LIANG YONGGUANG
  • LI XINGXING
  • HUANG XIAOTENG

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20241108

Claims (20)

  1. 1. A battery device, characterized by comprising: the box body is internally provided with an accommodating space; The battery cell assembly is positioned in the accommodating space and comprises a plurality of battery cells arranged along a first direction, and the first direction is intersected with the height direction of the box body; The heating component is positioned in the accommodating space and arranged between the battery unit component and the bottom wall of the box body, the heating component comprises a heating element and a protective layer, the protective layer is arranged on two sides of the heating element respectively along the height direction of the box body, the protective layers on two sides of the heating element are mutually connected, the protective layer is arranged with the heating element in an insulating mode, and the heating element is arranged to generate heat under the condition of being electrified and used for heating the battery unit.
  2. 2. The battery device according to claim 1, wherein the protective layer of the heat generating member toward the bottom wall of the case is at least two layers.
  3. 3. The battery device of claim 2, wherein the protective layer having at least two layers comprises: an insulating film layer; The reinforcing layer is positioned on one side of the insulating film layer, which is away from the heating element, and the reinforcing layer is connected with the insulating film layer.
  4. 4. The battery device according to claim 3, wherein the reinforcing layer comprises any one of an epoxy resin layer, a ceramic composite layer, a nylon polyester resin composite insulating film layer, or a polyurea coating layer.
  5. 5. The battery device according to claim 3, wherein the thickness of the reinforcing layer is S, and the value of S is in the range of 0.1mm to 0.5mm.
  6. 6. The battery device of claim 5, wherein S has a value in the range of 0.15mm to 0.25mm.
  7. 7. A battery device according to claim 3, wherein the heating element further comprises a glue layer, the glue layer being located on a side of the reinforcement layer facing away from the insulating layer, the reinforcement layer being bonded to the bottom wall of the housing by the glue layer.
  8. 8. The battery device of claim 3, further comprising a structural adhesive layer disposed within the receiving space and between the battery cell assembly and the bottom wall of the housing, the battery cell assembly being bonded to the bottom wall of the housing by the structural adhesive layer, the heating element being disposed within the structural adhesive layer.
  9. 9. The battery device according to any one of claims 1 to 8, wherein the heat generating member has a first heat generating region, a second heat generating region, and a third heat generating region, one side of the second heat generating region in the first direction is provided with the first heat generating region, the other side of the second heat generating region in the first direction is provided with the third heat generating region, the first heat generating region and the third heat generating region are respectively used for heating different battery cells outermost in the first direction, a dimension of the first heat generating region in the first direction is L1, a dimension of the second heat generating region in the first direction is L2, a dimension of the third heat generating region in the first direction is L3, a resistance of the first heat generating region is R1, a resistance of the second heat generating region is R2, and a resistance of the third heat generating region is R3, R2/L2< R1/L1, R2/L2< R3/L3.
  10. 10. The battery device according to claim 9, wherein the first heating region, the second heating region, and the third heating region each have a bent portion, a length of the first heating region is L4 in an extending direction of the first heating region, a length of the second heating region is L5 in an extending direction of the second heating region, and a length of the third heating region is L6, L4/L1> L5/L2, L6/L3> L5/L2 in an extending direction of the third heating region.
  11. 11. The battery device according to claim 9 or 10, wherein the number of the heat generating members is one, the heat generating members have three heating sections connected in series, one heating section is located in the second heating zone, and the other two heating sections are located in the first heating zone and the third heating zone in one-to-one correspondence.
  12. 12. The battery device of any one of claims 1-10, wherein the heating component comprises at least two parallel heat generating elements configured to heat the battery cell assembly individually or simultaneously.
  13. 13. The battery device of claim 12, further comprising a control switch, wherein each of the heat generating elements is connected in series with the control switch and constitutes a parallel branch, each of the parallel branches is connected in parallel, and the battery cell is configured to supply power to the parallel branch.
  14. 14. The battery device according to claim 13, wherein the number of the heat generating members is two, one of the heat generating members is a first heat generating member, the other of the heat generating members is a second heat generating member, the first heat generating member is located on one side of the second heat generating member in the second direction, At least part of the first heating parts and at least part of the second heating parts are respectively used for heating the battery cells at the outermost sides of the battery cell assemblies along the first direction, and the second direction is respectively intersected with the first direction and the height direction of the box body.
  15. 15. The battery device according to claim 14, wherein the number of the battery cells in the battery cell assembly is three or more, the first heat generating member includes a first heat generating portion, a second heat generating portion, and a third heat generating portion, the first heat generating portion is connected in series to one side of the second heat generating portion in the first direction, the third heat generating portion is connected in series to the other side of the second heat generating portion in the first direction, the first heat generating portion and the third heat generating portion are respectively used for heating the battery cells in the battery cell assembly that are different from each other in the outermost side in the first direction, and the second heat generating portion is used for heating the battery cells in the middle of the battery cell assembly.
  16. 16. The battery device according to claim 15, wherein the second heat generating portion is a straight resistance wire having a length direction identical to the first direction, the straight resistance wire has a first connection end connected in series with the first heat generating portion and a second connection end connected in series with the third heat generating portion, and/or the first heat generating portion and the third heat generating portion have first bent portions, respectively.
  17. 17. The battery device according to claim 15 or 16, wherein the second heat generating member includes a first heat generating section, a second heat generating section, and a third heat generating section, one end of the second heat generating section in the first direction is connected in series with the first heat generating section, the other end of the second heat generating section in the first direction is connected in series with the third heat generating section, the first heat generating section and the third heat generating section are used for heating the battery cells that are different outermost in the first direction in the battery cell assembly, and the second heat generating section is used for heating the battery cells in the middle of the battery cell assembly.
  18. 18. The battery device of claim 17, wherein the first, second, and third heat-generating segments each have a second bend.
  19. 19. The battery device according to claim 17 or 18, wherein a dimension of the second heat generating section in the second direction is D1, a maximum dimension between the second heat generating section and the second heat generating portion in the second direction is D2, and a value of D1/D2 is in a range of 0.1 to 0.98.
  20. 20. The battery device of claim 19, wherein D1/D2 has a value in the range of 0.7-0.95.

Description

Battery device and electricity utilization device Technical Field The application relates to the technical field of batteries, in particular to a battery device and an electricity utilization device. Background The battery works in a low-temperature environment, so that the charge and discharge performance of the battery can be influenced, the service life of the battery is influenced, and the problem that the heating film is poor in heating reliability exists in the process of heating the battery monomer in the battery by adopting the heating film. Disclosure of Invention In view of the above, the present application provides a battery device and an electric device, which can improve the uneven heating of the battery. In a first aspect, the present application provides a battery device comprising: the box body is internally provided with an accommodating space; The battery cell assembly is positioned in the accommodating space and comprises a plurality of battery cells arranged along a first direction, and the first direction is intersected with the height direction of the box body; The heating component is located accommodation space to locate between the diapire of battery cell subassembly and box, heating component is including generating heat piece and inoxidizing coating, follows the direction of height of box, and the both sides of generating heat piece are equipped with the inoxidizing coating respectively, and the inoxidizing coating interconnect of the both sides of generating heat piece, inoxidizing coating and the insulating setting of generating heat piece, the setting of generating heat is used for heating battery cell subassembly under the circular telegram. The guard layer of heating element plays the effect of protection to the heating element, can stop that metal foreign matter pierces heating element to reduce the probability that heating element's heating element damaged appears, thereby improve the reliability of heating element work, especially when heating element is a plurality of, can reduce the metal foreign matter in the box and pierce partial heating element and cause the probability that the part heating element damaged unable work, thereby can make a plurality of heating element heat battery cell assembly simultaneously, with the battery cell assembly is heated evenly. In some embodiments, the protective layer of the heat generating element towards the bottom wall of the case is at least two layers. Therefore, the multiple protection effect can be achieved, the probability that metal foreign matters on the bottom wall of the box body pierce the heating component is reduced, and the working reliability of the heating component is improved. In some embodiments, the protective layer having at least two layers comprises: an insulating film layer; the reinforcing layer is positioned on one side of the insulating film layer, which is away from the heating element, and the reinforcing layer is connected with the insulating film layer. When metallic foreign matter exists in the bottom wall of the box body, the reinforcing layer is used as a first layer for protection, the metallic foreign matter is prevented from penetrating into the heating component, and when the first layer for protection fails, the insulating film layer can further prevent the metallic foreign matter from penetrating through the heating component, so that the working reliability of the heating component is improved. In some embodiments, the reinforcing layer comprises any one of an epoxy resin layer, a ceramic composite layer, a nylon polyester resin composite insulating film layer, or a polyurea coating. Therefore, the metal piercing resistance effect of the heating component can be improved, so that the working reliability of the heating component is improved. In some embodiments, the thickness of the reinforcing layer is S, which ranges from 0.1mm to 0.5mm. Reinforcing layer S=0.1mm can stop basically that the metal foreign matter pierces the piece that generates heat, and along with the increase of S, the metal foreign matter pierces the degree of difficulty of generating heat also bigger, and the reliability of heating element work is higher, but the reinforcing layer after can occupy the great space of box, influences battery device' S capacity. Therefore, the value range of S is set to be 0.1mm-0.5mm under the condition of considering the puncture resistance of the reinforcing layer and the occupied space of the reinforcing layer. In some embodiments, S has a value in the range of 0.15mm to 0.25mm. S=0.15mm, can further improve the reinforcing layer and stop metal foreign matter and impale the ability of heating element more, give consideration to under the condition of reinforcing layer occupation space, with the value scope of S0.15mm-0.25mm, on the one hand can reduce the influence to battery device capacity, can satisfy the reinforcing layer simultaneously to metal foreign matter' S anti demand of impali