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CN-224217511-U - Battery pack and energy storage cabinet

CN224217511UCN 224217511 UCN224217511 UCN 224217511UCN-224217511-U

Abstract

The application provides a battery pack and an energy storage cabinet. The battery pack may include at least two sets of first coils arranged in a first direction. Each set of first coils comprises at least one first coil. A first electric core is arranged between any two adjacent groups of first coils, and the two groups of first coils are symmetrically arranged relative to the first electric core. The two groups of coils are used for applying a constant magnetic field to the first electric core when current is introduced, so that the first electric core in the battery pack is applied with the constant magnetic field. Therefore, the electrode material in the first cell is magnetized by the constant magnetic field, so that ions in the first cell are magnetically aligned and flow and diffusion of the ions are accelerated, and the internal polarization resistance in the first cell is reduced, so that the electrochemical reaction speed is improved. Thus, the capacity, the quick charge capacity and the energy efficiency of the first battery cell can be improved, and the service life of the first battery cell can be prolonged.

Inventors

  • TIAN ZHIMING
  • LI LINFU
  • XIE KEQIANG
  • SHEN BINGJIE
  • YU SHENJUN

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260508
Application Date
20250306

Claims (17)

  1. 1. The battery pack is characterized by comprising at least two groups of first coils which are arranged along a first direction, each group of first coils in the at least two groups of first coils comprises at least one first coil, a first electric core is arranged between any two adjacent groups of first coils in the at least two groups of first coils, the two groups of first coils are symmetrically arranged relative to the first electric core, and the two groups of first coils are used for applying a constant magnetic field to the first electric core when current is introduced.
  2. 2. The battery pack according to claim 1, further comprising at least two sets of second coils arranged in a second direction, the second direction being perpendicular to the first direction, each of the at least two sets of second coils including at least one second coil, a second cell being provided between any adjacent two sets of second coils of the at least two sets of second coils, the two sets of second coils being symmetrically arranged with respect to the second cell, the two sets of second coils being adapted to apply a constant magnetic field to the second cell when a current is applied.
  3. 3. The battery pack according to claim 2, wherein the at least two first coils are connected in parallel, any one of the at least two first coils including at least two first coils arranged in the second direction and connected in series; The at least two groups of second coils are connected in parallel, any one group of second coils in the at least two groups of second coils comprises at least two second coils, the at least two second coils are arranged along the first direction, and the at least two second coils are connected in series.
  4. 4. A battery pack as claimed in claim 2 or 3, wherein a first thermal insulation layer is provided between the first cell and the two sets of first coils, and a second thermal insulation layer is provided between the second cell and the two sets of second coils.
  5. 5. A battery pack as claimed in claim 2 or 3, wherein the outer surface of each of the at least two first coils and each of the at least two second coils is coated with an insulating layer.
  6. 6. A battery pack as claimed in any one of claims 1 to 3, wherein the first coil is supplied with a constant current during charging or discharging of the battery pack.
  7. 7. The battery pack according to any one of claims 1 to 3, wherein the battery pack includes two sets of first coils arranged in the first direction with a plurality of first electric cells disposed therebetween, and/or, The battery pack comprises two groups of second coils arranged along a second direction, a plurality of second electric cores are arranged between the two groups of second coils, and the second direction is perpendicular to the first direction.
  8. 8. The battery pack according to any one of claims 1 to 3, wherein the first cell includes four sides connected in sequence, two sides of the four sides being disposed opposite to each other in the first direction, and the other two sides being disposed opposite to each other in the second direction, the second direction being perpendicular to the first direction, and an area of the two sides being larger than an area of the other two sides.
  9. 9. The battery pack of claim 8, wherein an area of any one of the two sets of first coils covers at least 85% of any one of the two sets of sides of the first cell.
  10. 10. The battery pack of any one of claims 1 to 3, further comprising a first liquid cooling plate located at a bottom of the first cell, the first liquid cooling plate in thermally conductive connection with each of the at least two sets of first coils.
  11. 11. The battery pack of claim 10, wherein a thermal conductive adhesive is disposed between the liquid cooling plate and each of the first coils, the thermal conductive adhesive having a thermal conductivity greater than or equal to 0.5W/(mK).
  12. 12. A battery pack as claimed in any one of claims 1 to 3, wherein the battery pack has a port, the at least two sets of first coils being connected to the port.
  13. 13. A battery pack as claimed in any one of claims 1 to 3, further comprising a second liquid cooling plate provided in correspondence with each of the first coils, the second liquid cooling plate having a U-shaped configuration and being sandwiched between opposite sides of each of the first coils, the second liquid cooling plate being located between the first cells and each of the first coils.
  14. 14. The battery pack of claim 13, wherein a thermally conductive material is disposed between the second liquid cooling plate and the first cell.
  15. 15. An energy storage cabinet comprising a cabinet housing at least one battery pack according to any one of claims 1 to 14.
  16. 16. The energy storage cabinet is characterized by comprising a cabinet, wherein the cabinet contains at least one battery pack, and each battery pack in the at least one battery pack is provided with at least one pair of coils which are positioned outside the battery packs and symmetrically arranged relative to the battery packs, and the coils are used for applying a constant magnetic field to the battery packs when current is introduced.
  17. 17. The energy storage cabinet of claim 16, wherein the material of the housing of the battery pack is a material having a magnetic permeability greater than or equal to 4pi x 10 -7 H/m and less than or equal to 4pi x 10 -5 H/m.

Description

Battery pack and energy storage cabinet Technical Field The application relates to the technical field of energy storage, in particular to a battery pack and an energy storage cabinet. Background The lithium ion battery has the advantages of high energy density, long service life and the like, and is widely applied to the fields of new energy automobiles, energy storage and the like. In practical applications, a plurality of electric cells are generally integrated into a battery pack in a serial or parallel manner. However, there are individual differences between the plurality of cells. Under the action of the battery management unit (battery management unit, BMU), when the battery pack is discharged, the battery pack stops discharging when the voltage of the single battery cell reaches the discharge cut-off voltage, and when the battery pack is charged, the battery pack stops charging when the voltage of the single battery cell reaches the charge cut-off voltage. Therefore, the lowest capacity cell in the battery pack can severely affect the capacity exertion of the entire battery pack. Disclosure of utility model The application provides a battery pack and an energy storage cabinet, wherein a constant magnetic field is applied to a battery core of the battery pack so as to improve the capacity and energy efficiency of the battery core, thereby improving the overall performance of the battery pack. In a first aspect, the present application provides a battery pack. The battery pack specifically includes at least two first coils arranged along a first direction, each of the at least two first coils including at least one first coil. And first electric cores are arranged between any two adjacent first coils in the at least two groups of first coils, and the two groups of first coils are symmetrically arranged relative to the first electric cores. The two groups of first coils are used for applying a constant magnetic field to the first electric core when current is introduced. In the present application, the battery pack may include a plurality of battery cells. When the battery pack is in a charging state or a discharging state, the first coil is supplied with a constant current, so that the first coil can apply a constant magnetic field on two sides of a first cell of the plurality of cells. The first battery cell may be one or more battery cells. Specifically, ions inside the battery cell move from the positive electrode material to the negative electrode material when the battery pack is in a charged state, and ions move from the negative electrode material to the positive electrode material when the battery pack is in a discharged state. Taking charge as an example, when ions move to the vicinity of the anode material, the presence of minute protrusions on the surface of the anode material causes the ions to move along the surface of the minute protrusions and tend to preferentially deposit on the surface of the minute protrusions, thereby triggering dendrite growth. When the first coil applies a constant magnetic field, ions cut magnetic lines of force of the constant magnetic field when moving along the surface of the minute projection, so that the ions move in a spiral direction due to lorentz force, and further, the ions are prevented from being deposited near the minute projection. Therefore, the electrode material in the first battery cell is magnetized by the constant magnetic field, so that ions in the first battery cell are magnetically arranged and flow and diffusion of the ions are accelerated, the internal polarization resistance in the first battery cell is reduced, the electrochemical reaction speed is improved, the capacity, the quick charge capacity and the energy efficiency of the first battery cell can be increased, the service life of the first battery cell is prolonged, and the overall performance of the battery pack is improved. In one embodiment, the battery pack may further include at least two sets of second coils arranged in a second direction, the second direction being perpendicular to the first direction. Each of the at least two sets of second coils includes at least one second coil. And a second electric core is arranged between any two adjacent second coils in the at least two groups of second coils, and the two groups of second coils are symmetrically arranged relative to the second electric core. The two groups of second coils are used for applying a constant magnetic field to the second electric core when current is introduced. The first and second electric cores may be the same electric core or may be different electric cores. That is, the battery cell includes four sides connected in sequence, wherein two opposite sides may be provided with two first coils, or two other opposite sides may be provided with two second coils, or wherein two opposite sides may be provided with two first coils and two other opposite sides may be provided with two second coils. In this emb