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CN-121983727-A - Battery pack and energy storage device

CN121983727ACN 121983727 ACN121983727 ACN 121983727ACN-121983727-A

Abstract

The application provides a battery pack and an energy storage device, wherein the battery pack comprises a shell, a battery management system and a plurality of battery cells are arranged in the shell, the size of each battery cell in the first direction and the size of each battery cell in the second direction are larger than those of each battery cell in the third direction, each battery cell comprises two pole posts and an explosion-proof valve arranged between the two pole posts, the battery cells comprise two rows arranged side by side, and the pole post and the explosion-proof valve of any battery cell are arranged towards the other battery cell. According to the application, the third direction with smaller battery core size corresponds to the height direction of the shell, and the first direction with larger size corresponds to the depth direction of the shell, so that a larger number of battery cores can be arranged in the height direction of the cabinet body, and the space in the depth direction of the cabinet body can be fully utilized. Through setting up the explosion-proof valve of two rows of electric cores relatively, the high-temperature high-speed efflux of eruption can get into the clearance between two rows of electric cores when electric core thermal runaway, and reduce the injection velocity to avoid causing the damage to electric structures such as the outside cable of casing.

Inventors

  • LI XIANZHE
  • Jiang Fuxu
  • Shi Jiafei
  • DAI SHENGYONG

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260505
Application Date
20251224

Claims (15)

  1. 1. A battery pack, comprising: The battery management system and the plurality of electric cores are arranged in the shell, the battery management system comprises a circuit board, the plurality of electric cores are connected with the circuit board through conductive pieces, and the plurality of electric cores are connected through the conductive pieces; The size of each battery cell in the first direction and the size of each battery cell in the second direction are larger than the size of each battery cell in the third direction, each battery cell comprises two polar posts and an explosion-proof valve arranged between the two polar posts, the two polar posts and the explosion-proof valve are positioned in the planes of the battery cells in the first direction and the third direction, the two polar posts are arranged along the first direction of the battery cell, and the first direction, the second direction and the third direction are mutually perpendicular; the plurality of electric cores comprise two rows arranged side by side along the second direction, each row of electric cores comprise a plurality of electric cores arranged along the first direction, and the polar column and the explosion-proof valve of any row of electric cores are arranged towards the other row of electric cores; the shell is provided with a pressure relief hole, and the pressure relief hole is positioned in the surface of the shell in the first direction and the second direction.
  2. 2. The battery pack of claim 1, wherein a plurality of cells in one column of the cells are arranged side by side with a plurality of cells in another column of the cells in the second direction; The explosion-proof valves of any one row of the battery cells are arranged towards the explosion-proof valves of another row of the battery cells.
  3. 3. The battery pack according to claim 1, wherein a plurality of cells in one column of the cells are arranged offset from a plurality of cells in another column of the cells in the second direction; The explosion-proof valves of any one row of the battery cores are arranged in a staggered manner with the explosion-proof valves of the other row of the battery cores.
  4. 4. The battery pack of any one of claims 1-3, wherein the number of cells in two columns is the same; the direction of the plane where the circuit board is located is perpendicular to the first direction, and the circuit board is located at one side of the two rows of the battery cells.
  5. 5. The battery pack of any one of claims 1-3, wherein the number of cells in two columns is different; The circuit board comprises a first circuit board and a second circuit board; The direction of the plane where the first circuit board is located is parallel to the first direction, and the first circuit board is located at one side of a row of the battery cells with smaller quantity; the direction of the plane where the second circuit board is located is perpendicular to the first direction, and the second circuit board is located on one side of a row of more electric cores.
  6. 6. The battery pack according to any one of claims 1 to 5, wherein, in adjacent two of the cells in each column, the faces in which the second direction and the third direction are located are disposed adjacent to each other, and a ratio of a dimension of each of the cells in the second direction to a dimension of the third direction is 2 to 4.
  7. 7. The battery pack of any one of claims 1-6, wherein a thermal insulation is disposed between two rows of the cells; a heat insulation piece is arranged between two adjacent electric cores of each row of electric cores; The pressure relief hole is arranged towards the explosion-proof valve.
  8. 8. The battery pack of any one of claims 1-7, wherein the plurality of cells are connected in series by the conductive member therebetween; In the two rows of the battery cells, the conducting parts between the two battery cells far away from the battery management system are of flexible structures, and the rest of the conducting parts are of rigid structures.
  9. 9. The battery pack according to any one of claims 1to 8, wherein the housing is partitioned by a partition into a first accommodation chamber and a second accommodation chamber, the first accommodation chamber and the second accommodation chamber are arranged in the first direction, the plurality of electric cells are disposed in the first accommodation chamber, the battery management system is disposed in the second accommodation chamber, and the conductive member penetrates out of the partition to be connected to the circuit board.
  10. 10. A battery pack, comprising: The battery management system and the plurality of electric cores are arranged in the shell, the battery management system comprises a circuit board, the plurality of electric cores are connected with the circuit board through conductive pieces, and the plurality of electric cores are connected through the conductive pieces; The size of each battery cell in the first direction and the size of each battery cell in the second direction are larger than the size of each battery cell in the third direction, each battery cell comprises two polar posts and an explosion-proof valve arranged between the two polar posts, the two polar posts and the explosion-proof valve are positioned in the planes of the battery cells in the first direction and the third direction, the two polar posts are arranged along the first direction of the battery cell, and the first direction, the second direction and the third direction are mutually perpendicular; the plurality of electric cores comprise two rows arranged side by side along the second direction, each row of electric cores comprises a plurality of electric cores arranged along the first direction, and the polar post and the explosion-proof valve of any row of electric cores are arranged away from the other row of electric cores; The shell is provided with a pressure relief hole, and the pressure relief hole is positioned in the surface of the shell in the first direction and the third direction.
  11. 11. The battery pack of claim 10, wherein the number of cells in two rows is the same; the direction of the plane where the circuit board is located is perpendicular to the first direction, and the circuit board is located at one side of the two rows of the battery cells.
  12. 12. The battery pack of claim 10, wherein the number of cells in two rows is different; The circuit board comprises a first circuit board and a second circuit board; The direction of the plane where the first circuit board is located is parallel to the first direction, and the first circuit board is located at one side of a row of the battery cells with smaller quantity; the direction of the plane where the second circuit board is located is perpendicular to the first direction, and the second circuit board is located on one side of a row of more electric cores.
  13. 13. The battery pack according to any one of claims 10 to 12, wherein, in two adjacent cells of each column of the cells, the faces in which the second direction and the third direction are located are disposed adjacent to each other, and a ratio of a dimension of each cell in the second direction to a dimension of each cell in the third direction is 2 to 4.
  14. 14. The battery pack according to any one of claims 10 to 13, wherein a thermal insulation member is provided between the side of each column of the battery cells having the terminal post and the case; a heat insulation piece is arranged between two adjacent electric cores of each row of electric cores; The pressure relief hole is arranged towards the explosion-proof valve.
  15. 15. An energy storage device, the energy storage device comprising: A cabinet body; The control module, the power module and the battery packs are sequentially stacked in the cabinet body along the height direction of the cabinet body; the battery pack includes: The battery management system and the plurality of electric cores are arranged in the shell, the battery management system comprises a circuit board, the plurality of electric cores are connected with the circuit board through conductive pieces, and the plurality of electric cores are connected through the conductive pieces; The size of each battery cell in the first direction and the size of each battery cell in the second direction are larger than the size of each battery cell in the third direction, each battery cell comprises two polar posts and an explosion-proof valve arranged between the two polar posts, the two polar posts and the explosion-proof valve are positioned in the planes of the battery cells in the first direction and the third direction, the two polar posts are arranged along the first direction of the battery cell, and the first direction, the second direction and the third direction are mutually perpendicular; the plurality of electric cores comprise two rows arranged side by side along the second direction, each row of electric cores comprise a plurality of electric cores arranged along the first direction, and the polar column and the explosion-proof valve of any row of electric cores are arranged towards the other row of electric cores; the shell is provided with a pressure relief hole, and the pressure relief hole is positioned in the surface of the shell in the first direction and the second direction.

Description

Battery pack and energy storage device Technical Field The application relates to the technical field of power supply, in particular to a battery pack and an energy storage device. Background In the systems such as the communication base station, the core machine room, the data center and the like, the lithium battery plays an irreplaceable role as a standby power supply component when the power grid is powered down and the load fluctuates. Lithium batteries are typically placed in standard cabinets, which are rectangular in shape and of a fixed width, and are therefore also correspondingly designed in the form of rectangular solids. In order to improve the space utilization of the lithium battery, a square battery cell is currently generally selected, the battery cell is vertically placed in the shell to form a lithium battery structure, a pole of the battery cell is arranged upwards, namely, the width direction of the battery cell is the same as the depth direction of the shell, and the height direction of the battery cell is the same as the height direction of the shell. However, the height dimension of the square battery cell is far larger than the width dimension thereof, and the standing manner leads to a larger height and a shallower depth of the formed lithium battery. When placing this lithium cell in the rack, be limited by the rack size, the lithium cell quantity that can hold is less, and the space of cabinet body depth direction can't be fully utilized. In addition, the high-temperature and high-speed jet generated during thermal runaway of the battery cell can be directly sprayed out of the shell, so that the cable and other structures outside the shell are easily damaged. Disclosure of Invention The application provides a battery pack and an energy storage device, which solve the problems that when the existing lithium batteries are placed in a cabinet, the number of the lithium batteries which can be accommodated is small, the space in the depth direction of the cabinet body cannot be fully utilized, and the cable and other structures outside the shell are damaged by high-temperature and high-speed jet generated when the battery core is in thermal runaway. In order to achieve the above purpose, the application adopts the following technical scheme: The battery pack comprises a shell, wherein a battery management system and a plurality of electric cores are arranged in the shell, the battery management system and the electric cores are distributed in the first direction, the battery management system comprises a circuit board, the electric cores are connected with the circuit board through conductive pieces and are connected with each other through conductive pieces, the size of each electric core in the first direction and the size of each electric core in the second direction are larger than the size of each electric core in the third direction, each electric core comprises two polar posts and an explosion-proof valve arranged between the two polar posts, the two polar posts and the explosion-proof valve are located in a plane where the first direction and the third direction of the electric core are located, the two polar posts are distributed in the first direction of the electric core, the first direction, the second direction and the third direction are perpendicular to each other, the electric cores in the first direction and the second direction are arranged side by side, the polar posts and the explosion-proof valve of any electric core are arranged towards the other, and the two polar posts and the explosion-proof valve of the electric core in the first direction are located in the second direction, and the pressure relief hole is formed in the shell. According to the application, the first direction and the third direction of any row of the battery cells are arranged towards the other row of the battery cells, and the two pole columns are arranged along the first direction of the battery cells, so that the third direction with smaller battery cell size corresponds to the height direction of the shell, the first direction with larger size corresponds to the depth direction of the shell, the height size of the shell can be set smaller, the depth size can be set larger, and when the battery pack is placed in the cabinet body, a larger number of battery cells can be arranged in the height direction of the cabinet body, the capacity density of the energy storage device is improved, and the space in the depth direction of the cabinet body can be fully utilized. Through setting up the explosion-proof valve of two electric cores relatively, when certain electric core takes place thermal runaway, its high temperature high-speed efflux that erupts can get into the clearance between two electric cores of row, and the partial kinetic energy and the heat energy of this efflux can receive the hindrance of the electric core that does not run away to the face, plays the cushioning effect, reduces