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CN-121983726-A - Battery pack and vehicle

CN121983726ACN 121983726 ACN121983726 ACN 121983726ACN-121983726-A

Abstract

The invention discloses a battery pack and a vehicle, wherein the battery pack comprises a plurality of battery units, the battery units are sequentially arranged along a first direction, the battery units are suitable for being respectively fixed at the bottom of a vehicle body, two adjacent battery units are fixedly connected, and the battery units are electrically connected. The battery pack is split into a plurality of battery units, the battery units are independent individuals, each battery unit is smaller in size and surface area than an existing integral battery pack, so that the battery units can be stressed and optimized into a plurality of battery units respectively when being fixed on a vehicle body, the influence of expansion on stability during charging and discharging is reduced, in addition, the battery units are fixedly connected with each other, the stability of connection between the battery units can be improved, the battery units are conveniently installed and arranged, and the stability of the battery units after installation is improved, so that the reliability and the maintenance convenience are improved.

Inventors

  • HUANG WEI
  • XIONG YONG
  • HU JIAHAO
  • XU WEI
  • HE QINGLIN

Assignees

  • 比亚迪股份有限公司

Dates

Publication Date
20260505
Application Date
20251222

Claims (15)

  1. 1. The battery pack (1) is characterized by comprising a plurality of battery units (10), wherein the battery units (10) are sequentially arranged along a first direction, the battery units (10) are suitable for being respectively fixed at the bottom of a vehicle body (30), two adjacent battery units (10) are fixedly connected, and the battery units (10) are electrically connected.
  2. 2. The battery pack (1) according to claim 1, wherein the fall of the upper surface of any two of the plurality of battery cells (10) is less than or equal to 0.25mm, and/or The drop of the lower surfaces of any two of the plurality of battery cells (10) is less than or equal to 0.25mm.
  3. 3. The battery pack (1) according to claim 1, wherein the battery cells (10) comprise a battery cell (100) and a housing (101), the battery cell (100) is disposed in the housing (101), the housing (101) comprises a first side beam (102) and a second side beam (103), the first side beam (102) and the second side beam (103) are respectively located at two sides of the battery cell (100) in a first direction, and in two adjacent battery cells (10), the first side beam (102) of one of the battery cells (10) is in lap joint with the second side beam (103) of the other battery cell (10).
  4. 4. A battery pack (1) according to claim 3, wherein the battery unit (10) further comprises an electrical connector (104), the first side beam (102) and the second side beam (103) are provided with through holes, the electrical connector (104) can be inserted into the housing (101) through the through holes to be electrically connected with the battery cell (100), and in two adjacent battery units (10), the electrical connector (104) is electrically connected.
  5. 5. The battery pack (1) according to claim 4, further comprising a distribution box (20), wherein the distribution box (20) is provided on a side of the battery cells (10) located on both sides away from the adjacent battery cells (10), and the electrical connection member (104) is electrically connected with the distribution box (20).
  6. 6. The battery pack (1) according to claim 5, wherein the battery unit (10) further comprises a slave control unit, a monitoring unit and a control unit, the distribution box (20) is provided with a master control unit, the slave control unit is electrically connected with the master control unit, the monitoring unit is arranged in the shell (101) and used for monitoring thermal runaway parameters in the shell (101), and the monitoring unit is electrically connected with the control unit.
  7. 7. The battery pack (1) according to claim 3, further comprising a cooling member, the case (101) further comprising a bottom plate (105), the cooling member being provided on the bottom plates (105) of the plurality of battery cells (10), or The number of the cooling pieces is plural, and the plurality of the cooling pieces are arranged on the bottom plates (105) of the plurality of the battery units (10) in a one-to-one correspondence manner.
  8. 8. A battery pack (1) according to claim 3, wherein the first side beam (102) and the second side beam (103) are each constructed in a lattice-like or hollowed-out structure.
  9. 9. A battery pack (1) according to claim 3, wherein the battery cells (10) are arranged to extend in a second direction, the case (101) further includes a third side beam (106) and a fourth side beam (107), the third side beam (106) and the fourth side beam (107) are respectively located at both sides of the battery cell (100) in the second direction, the third side beam (106) is connected between the first side beam (102) and the second side beam (103), the fourth side beam (107) is connected between the first side beam (102) and the second side beam (103), and the first direction is perpendicular to the second direction.
  10. 10. The battery pack (1) according to claim 9, wherein the third side beam (106) and the fourth side beam (107) are each configured in a grid-like or hollowed-out structure on a side away from the battery cell (100), and the third side beam (106) and the fourth side beam (107) are each configured in a solid structure on a side adjacent to the battery cell (100).
  11. 11. The battery pack (1) according to claim 9, wherein the third side rail (106) and the fourth side rail (107) are each provided with a first fixing portion (108), the battery cells (10) on both sides are each provided with a second fixing portion (109) on a side away from the adjacent battery cells (10), and the first fixing portion (108) and the second fixing portion (109) are each adapted to be fixed to the bottom of the vehicle body (30).
  12. 12. The battery pack (1) according to claim 11, wherein when the number of the battery cells (10) is singular, the connection of the battery cell (10) located in the middle and the adjacent battery cell (10) is provided with a third fixing portion adapted to be fixed to the bottom of the vehicle body (30); When the number of the battery units (10) is even, a fourth fixing part (110) is arranged at the joint between the two battery units (10) positioned in the middle, and the fourth fixing part (110) is suitable for being fixed at the bottom of the vehicle body (30).
  13. 13. The battery pack (1) according to claim 9, wherein the battery cell (10) further comprises a seal (111), the seal (111) sealing to the outer hollows of the first side rail (102), the second side rail (103), the third side rail (106) and the fourth side rail (107).
  14. 14. Battery pack (1) according to claim 1, characterized in that the battery cell (10) is an all-solid-state battery or a semi-solid-state battery.
  15. 15. A vehicle (2), characterized by comprising: A vehicle body (30); the battery pack (1) according to any one of claims 1 to 14, wherein a plurality of the battery cells (10) are respectively fixed to the bottom of the vehicle body (30).

Description

Battery pack and vehicle Technical Field The invention relates to the technical field of vehicles, in particular to a battery pack and a vehicle. Background The all-solid-state battery or semi-solid battery pack in the related art is generally of an overall structural design, the inside of the all-solid-state battery or semi-solid-state battery pack comprises a plurality of modules, each module consists of a plurality of electric cores, and the outside of the all-solid-state battery or semi-solid-state battery pack is covered by an overall shell after the plurality of modules are arranged. However, the expansion degree of the full-solid battery or the semi-solid battery pack is far greater than that of the liquid battery during charge and discharge, and the full-solid battery or the semi-solid battery pack has large influence on the whole shell during expansion due to large volume and large surface area due to the whole structural design of the full-solid battery or the semi-solid battery, so that the stability of the battery pack is easily damaged, and the installation and the later maintenance are not facilitated. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the battery pack which has the advantages of high reliability, convenience in installation and maintenance and the like. The invention further proposes a vehicle. The battery pack comprises a plurality of battery units, wherein the battery units are sequentially arranged along a first direction, the battery units are suitable for being respectively fixed at the bottom of a vehicle body, two adjacent battery units are fixedly connected, and the battery units are electrically connected. According to the battery pack disclosed by the invention, the battery pack is divided into a plurality of battery units, the battery units are all independent individuals, and compared with the existing integral battery pack, each battery unit is smaller in volume and surface area, so that the integral stress of the battery units can be optimized into the stress of the battery units respectively when the battery units are fixed on a vehicle body, the influence of expansion on stability when the battery units are charged and discharged is reduced, in addition, the adjacent two battery units are fixedly connected, the stability of connection between the battery units can be improved, and the battery units are conveniently installed and arranged in combination, so that the stability of the battery units after being installed is improved, and the reliability and the maintenance convenience are improved. In some examples of the invention, the height of the upper surface of any two of the plurality of battery cells is less than or equal to 0.25mm, and/or the height of the lower surface of any two of the plurality of battery cells is less than or equal to 0.25mm. In some examples of the invention, the battery unit comprises a battery core and a shell, wherein the battery core is arranged in the shell, the shell comprises a first side beam and a second side beam, the first side beam and the second side beam are respectively positioned at two sides of the battery core in a first direction, and in two adjacent battery units, the first side beam of one battery unit is in lap joint with the second side beam of the other battery unit. In some examples of the invention, the battery units further comprise electric connectors, through holes are formed in the first side beams and the second side beams, the electric connectors can penetrate into the shell through the through holes to be electrically connected with the electric cores, and in two adjacent battery units, the electric connectors are electrically connected. In some examples of the invention, the battery pack further includes a distribution box disposed on a side of the battery cells on both sides remote from adjacent battery cells, the electrical connection member being electrically connected with the distribution box. In some examples of the invention, the battery unit further comprises a slave control unit, a monitoring unit and a control unit, wherein the distribution box is provided with a master control unit, the slave control unit is electrically connected with the master control unit, the monitoring unit is arranged in the shell and used for monitoring a thermal runaway parameter in the shell, and the monitoring unit is electrically connected with the control unit. In some examples of the invention, the battery pack further comprises a cooling member, wherein the shell further comprises a bottom plate, the cooling member is arranged on the bottom plates of the battery units, or the cooling member is arranged on the bottom plates of the battery units in a one-to-one correspondence mode. In some examples of the invention, the first side beam and the second side beam are each configured in a lattice or hollowe