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CN-121983755-A - Battery pack and energy storage system

CN121983755ACN 121983755 ACN121983755 ACN 121983755ACN-121983755-A

Abstract

The application provides a battery pack and an energy storage system. The battery pack may include a housing, a cell buss bar, and a plurality of cells. The top of shell is equipped with access hole and apron, and the apron seals the access hole. The top of electric core is equipped with the utmost point post, and electric core busbar connection utmost point post, the tie point of electric core busbar and utmost point post is towards the access hole. When the battery pack works normally, the cover plate covers the access hole. When the battery pack fails, the cover plate is opened to expose the access hole. The electric connection state of the connection points can be directly checked through the access opening, the connection points are overhauled, the operation is simple and convenient, the whole shell is not required to be disassembled, and therefore the overhauling process is simplified.

Inventors

  • YAN WEI
  • MA PENGCHENG
  • LI XINGLIANG

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260505
Application Date
20251225

Claims (14)

  1. 1. A battery pack comprising a housing, and a plurality of cells and a cell buss bar located within the housing, wherein: the battery cell busbar is connected with the poles of the plurality of battery cells, and the connection points of the battery cell busbar and the poles of the plurality of battery cells face to the access hole.
  2. 2. The battery pack according to claim 1, wherein the housing comprises a first shell and a second shell, wherein the first shell and the second shell are connected side by side along the width direction of the battery pack, the battery cell busbar and the plurality of battery cells are positioned in the first shell, and an electric control module is arranged in the second shell; The shell is internally provided with an anode module busbar and a cathode module busbar, one end of the anode module busbar is connected with the total anode of the plurality of electric cores, the other end of the anode module busbar extends into the second shell and is connected with the electric control module, one end of the cathode module busbar is connected with the total cathode of the plurality of electric cores, the other end of the cathode module busbar extends into the second shell and is connected with the electric control module, and the connection point of the anode module busbar and the total anode and the connection point of the cathode module busbar and the total cathode are all oriented to the overhaul port.
  3. 3. The battery pack of claim 2, wherein a separator is disposed between the first housing and the second housing, the separator separating the plurality of cells and the electronic control module; The second shell is provided with a first flue, the first flue is isolated from the electric control module, an inlet of the first flue is arranged on the partition plate and is communicated with the first shell, and an outlet of the first flue is arranged at the top of the second shell.
  4. 4. A battery pack as claimed in claim 3, wherein the outlet of the first flue is provided with an explosion-proof valve.
  5. 5. The battery pack of claim 3 or 4, wherein the inlet of the first chimney includes a plurality of apertures distributed across the separator.
  6. 6. The battery pack according to any one of claims 3-5, wherein the second housing is further provided with a second flue, the second flue is isolated from the electronic control module, an inlet of the second flue is arranged at the bottom of the second housing, an outlet of the second flue is arranged at the top of the second housing, and the second flue penetrates through the second housing along the height direction.
  7. 7. The battery pack of claim 6, wherein the second housing is further provided with a first power terminal and a second power terminal, the first power terminal being positioned at a top of the second housing, the second power terminal being positioned at a bottom of the second housing, the second housing including a first side and a second side opposite along a length of the battery pack, the first chimney and the second chimney being aligned along the length and positioned adjacent to the first side, the first power terminal and the second power terminal being positioned adjacent to the second side.
  8. 8. The battery pack of claim 7, wherein the first power terminal is provided with a first clamping portion and the second power terminal is provided with a second clamping portion.
  9. 9. The battery pack of any one of claims 2-8, wherein the positive module buss bar comprises a copper bar or cable and the negative module buss bar comprises a copper bar or cable.
  10. 10. The battery pack of any one of claims 1-9, wherein a flexible circuit board is further disposed within the housing, the flexible circuit board being connected to the top of the cell buss bar with the flexible circuit board facing the access opening.
  11. 11. The battery pack of claim 10, wherein the flexible circuit board is provided with a plurality of openings, the tops of the plurality of cells are each provided with a venting valve, and the venting valves of the plurality of cells are oriented toward the plurality of openings and the access opening.
  12. 12. The battery pack of any one of claims 1-11, wherein the access opening has an area that is less than an area of the top of the housing.
  13. 13. The battery pack of any one of claims 1-12, wherein the top of the housing is further provided with a first bevel, and the bottom of the housing is further provided with a second bevel, the first bevel being parallel to the second bevel.
  14. 14. An energy storage system comprising a cabinet and a plurality of battery packs as claimed in any one of claims 1 to 13, a plurality of the battery packs being stacked in a height direction of the cabinet.

Description

Battery pack and energy storage system Technical Field The application relates to the technical field of energy, in particular to a battery pack and an energy storage system. Background Currently, a highly integrated closed structural design is generally adopted for a household energy storage battery pack. In order to ensure the dustproof and waterproof protection level and the structural strength of the battery pack, the shells of most battery packs are packaged by adopting integral metal plates or engineering plastics, and key components such as a battery module, a Battery Management System (BMS), an electrical connection cable, a fuse, a contactor and the like are integrated in the shells. The electrical connections inside the battery pack may include series-parallel copper bars or cable connections between modules, post fastening points, and the like. The electrical connection ensures safe and stable operation of the battery pack. If such connection points are in the form of virtual joints, looseness or corrosion, the contact resistance is liable to increase, which can cause local overheating, electric arcs and even fires under high-current working conditions. When a battery pack has a malfunction such as a voltage abnormality, an impedance imbalance, or a communication malfunction, it is generally necessary to check the electrical connection state inside the battery pack. Conventional maintenance or diagnostics also involve disassembly of the outer shell of the entire battery pack if access to the internal wiring is required. The process is complex in operation, time-consuming and labor-consuming, and needs technical personnel to use professional tools for disassembly and overhaul, and the situation that peripheral cables or components are damaged accidentally is very easy to occur in the disassembly and assembly process. Disclosure of Invention The application provides a battery pack and an energy storage system, which are used for overhauling electric connection in the battery pack through an overhauling port, so that an overhauling process is simplified. In a first aspect, the present application provides a battery pack. The battery pack specifically comprises a housing, and a battery cell busbar and a plurality of battery cells which are positioned in the housing. Wherein, the top of shell is equipped with access hole and apron, and the apron seals the access hole. The tops of the battery cores are provided with pole posts. The battery cell busbar is connected with the poles of the battery cells, and the connection points of the battery cell busbar and the poles of the battery cells face the overhaul port. In the battery pack of the present application, the housing is provided with an access opening. When the battery pack is in normal operation, the cover plate covers the access opening to seal the access opening, thereby forming a sealed housing. When the battery pack fails, the cover plate is opened to expose the access opening. Through the access hole, the electric connection state of the connection points of the battery cell busbar and the pole can be directly checked, the connection points are overhauled, the operation is simple and convenient, the whole shell is not required to be disassembled, and therefore the overhauling process is simplified. Further, to facilitate direct removal or installation of the connection points through the access opening, the connection points may be at least partially exposed to the access opening along the height of the battery pack, i.e., a projection of the access opening along the height may cover at least a portion of the connection points. In one possible embodiment, the case may include a first case and a second case, and the first case and the second case may be connected side by side in a width direction of the battery pack. The battery cell busbar and the battery cells are positioned in the first shell, and the second shell is internally provided with an electric control module. The access opening and the cover plate are located at the top of the first housing. A positive module busbar and a negative module busbar are also arranged in the shell. One end of the positive electrode module busbar is connected with the total positive electrodes of the plurality of battery cores, and the other end of the positive electrode module busbar extends into the second shell and is connected with the electric control module. One end of the negative electrode module busbar is connected with the total negative electrodes of the plurality of electric cores, and the other end of the negative electrode module busbar stretches into the second shell and is connected with the electric control module. The connection points of the positive electrode module busbar and the total positive electrode and the connection points of the negative electrode module busbar and the total negative electrode face the overhaul port so as to overhaul the connection points through the overhaul p