Search

CN-122026008-A - Battery pack

CN122026008ACN 122026008 ACN122026008 ACN 122026008ACN-122026008-A

Abstract

The application discloses a battery pack. The battery pack comprises a shell, a battery core module accommodated in the shell, wherein the battery core module comprises a plurality of battery cores, each battery core comprises an electrode, a connecting sheet and at least one first layer element and a second layer element, the connecting sheet is used for electrically connecting the electrodes of the battery cores, the first layer element is in direct contact with the electrodes and at least partially overlapped with the second layer element, the thickness of the first layer element is smaller than or equal to 0.5mm, and the thickness of the second layer element is larger than or equal to the thickness of the first layer element.

Inventors

  • LI WEIBO
  • ZHANG YUEXIANG
  • YANG BIN

Assignees

  • 南京泉峰科技有限公司

Dates

Publication Date
20260512
Application Date
20241030

Claims (13)

  1. 1. A battery pack, the battery pack comprising: A housing; a cell module contained within the housing, the cell module comprising: A plurality of electrical cells, the electrical cells comprising electrodes; The connecting pieces are used for electrically connecting the electrodes of the plurality of electric cores; The connecting piece at least comprises a first layer element and a second layer element, wherein the first layer element is in direct contact with the electrode and at least partially overlapped with the second layer element, the thickness of the first layer element is smaller than or equal to 0.5mm, and the thickness of the second layer element is larger than or equal to the thickness of the first layer element.
  2. 2. The battery pack of claim 1, wherein the first layer member has a first surface and a second surface, the first layer member having a thickness that is the spacing between the first surface and the second surface, the first surface being in direct contact with the electrode, the second surface being at least partially covered by the second layer member.
  3. 3. The battery pack of claim 1, wherein the second layer element has a thickness of 0.5mm or greater.
  4. 4. The battery pack of claim 1, wherein the first layer element is the same material as the second layer element.
  5. 5. The battery pack of claim 4, wherein the first layer element and the second layer element are each made of a copper nickel composite material.
  6. 6. The battery pack of claim 1, wherein the first layer element is a different material than the second layer element, the second layer element having a thermal and/or electrical conductivity greater than the first layer element.
  7. 7. The battery pack of claim 1, wherein the second layer element is made of red copper.
  8. 8. The battery pack of claim 1, wherein the tabs are folded to form the first layer element and the second layer element.
  9. 9. The battery pack of claim 1, wherein the proportion of the length of the tab taken up by the first layer element alone in the direction of current flow is less than or equal to the proportion of the length taken up by the first layer element in combination with the second layer element.
  10. 10. The battery pack of claim 1, wherein the tab has an opening through which a sealant seals the electrode.
  11. 11. The battery pack according to claim 1, wherein the overlapping portion of the first layer member and the second layer member is provided at a portion where the connection portion meets the positive electrode terminal and/or the negative electrode terminal of the battery pack.
  12. 12. The battery pack of claim 1, wherein the battery pack includes a bracket supporting the battery cells, and the connecting piece is at least partially fixed to a side wall of a battery cell module formed by the bracket.
  13. 13. The battery pack of claim 1, further comprising a flexible circuit board including a conductive layer terminated with a pad via, the tab having a mounting portion insertable into the pad via.

Description

Battery pack Technical Field The application relates to the technical field of electric tools, in particular to a battery pack. Background The energy supply iteration of manual operation and fuel oil is carried out, and at present, most of tools widely applied to various scenes such as gardens, buildings and the like use lithium batteries to realize energy supply. One of the emphasis in lithium battery technology is on safety, which includes safety on both a microscopic level, for example, possibly related to the positive and negative electrode materials of the battery cell, and safety on a macroscopic level, for example, water resistance, insulation, heat dissipation, fire resistance, extrusion, drop, etc., and in order to improve the overall performance of the battery pack, the adaptation of the battery pack for an electric tool to severe conditions needs to be considered in combination with the above factors. This section provides background information related to the application, which is not necessarily prior art. Disclosure of Invention It is an object of the present application to solve or at least mitigate some or all of the above problems. To this end, the present application provides a battery pack. The application adopts the following technical scheme: A battery pack comprises a shell, a plurality of battery cells accommodated in the shell, a support, an end cover and a sealing glue, wherein the battery cells comprise electrodes, the support is accommodated in the shell and supports the battery cells, the support is provided with an end face corresponding to the electrode positions of the battery cells and provided with an opening exposing the electrodes, the end cover is accommodated in the shell and mounted to the end face of the support, the sealing glue is filled between the end cover and the end face, the end cover and/or the end face is/are formed with a separator, the sealing glue is separated in a plurality of areas divided by the separator, and the sealing glue covers the electrodes in the plurality of areas. In some embodiments, multiple electrodes within the same area are electrically connected by one connecting pad. In some embodiments, the tabs electrically connect multiple electrodes within the same area via an opening in the end face exposing the electrode. In some embodiments, the tabs are slotted near the interface with the electrode. In some embodiments, the spacer is disposed around the connection tab. In some embodiments, the bracket is coupled to the end cap via a male-female seam allowance. In some embodiments, the female and/or male tang is provided with a sealing material, including a soft gel. In some embodiments, the cell further comprises a cell body, at least a portion of the cell body being uncovered by the sealant. In some embodiments, the sealant comprises one or more of a one-component silicone, a two-component potting adhesive, and an intumescent adhesive. In some embodiments, the sealant has a thermal conductivity of 0.3W/(m·k) or more. In some embodiments, the end cap comprises a flame retardant material. A battery pack comprises a shell, a battery cell accommodated in the shell and comprising electrodes, a support accommodated in the shell and used for supporting the battery cell, an end cover accommodated in the shell and mounted to the end face of the support, wherein the end face is provided with an opening exposing the electrodes, the end cover is accommodated in the shell and comprises a sealant, the sealant is filled between the end cover and the end face and covers the electrodes, the electrodes covered by the sealant comprise a first electrode and a second electrode, and the shortest distance between the first electrode and the end cover is smaller than that between the second electrode and the end cover. In some embodiments, the first type of electrode comprises a positive electrode of a cell. In some embodiments, the second type of electrode comprises a negative electrode of a cell. In some embodiments, the end cap is formed with a recess at a location corresponding to the location of the electrode of the cell, the recess depth of the end cap corresponding to the first type of electrode being greater than the recess depth of the end cap corresponding to the second type of electrode. In some embodiments, the end cap is formed with a countersunk boss toward the first-type electrode at a location corresponding to the location of the first-type electrode. In some embodiments, the central local region of the countersunk boss has a thin-walled feature. In some embodiments, the thickness of the portion of the end cap corresponding to the location of the first type of electrode is less than the thickness of the portion of the end cap corresponding to the location of the second type of electrode. In some embodiments, the end cap is fixedly mounted to the end face of the bracket by a fastener. A method for assembling a battery cell module comprises the steps of