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CN-121983759-A - Square battery and its manufacturing method

CN121983759ACN 121983759 ACN121983759 ACN 121983759ACN-121983759-A

Abstract

The invention discloses a square battery, which comprises a shell and a battery core arranged in the shell, wherein the shell comprises a top cover plate, a positive pole post is arranged on the top cover plate, the positive pole post and the top cover plate are arranged in an insulating way, the battery core comprises a positive pole lug group and a negative pole lug group, the positive pole lug group and the negative pole lug group are both positioned at one end of the battery core facing the top cover plate, the positive pole lug group gathers towards the first side of the battery core and forms a first bending structure corresponding to the positive pole post and forms a first bending structure corresponding to the first bending structure of the positive pole post, the negative pole lug group gathers towards the first side of the battery core and forms a second bending structure corresponding to the first bending structure of the top cover plate, the positive pole lug group is directly welded with the positive pole post, or the positive pole lug group is directly welded with the top cover plate, or the negative pole lug group is welded with the top cover plate through a second switching plate. The embodiment of the invention greatly improves the space utilization rate inside the battery.

Inventors

  • LUO HUAEN
  • XU RUI
  • QIN JUNRU
  • Jiang Delei

Assignees

  • 路华固态聚合物电池(东莞)有限公司

Dates

Publication Date
20260505
Application Date
20260129

Claims (10)

  1. 1. The square battery is characterized by comprising a shell and a battery cell arranged in the shell, wherein the shell comprises a top cover plate, a positive pole is arranged on the top cover plate, the positive pole and the top cover plate are arranged in an insulating mode, the battery cell comprises a positive pole tab group and a negative pole tab group, the positive pole tab group and the negative pole tab group are both positioned at one end of the battery cell facing the top cover plate, the positive pole tab group gathers towards a first side of the battery cell and forms a first bending structure corresponding to one-time bending arranged on the positive pole, and the negative pole tab group gathers towards the first side of the battery cell and forms a second bending structure corresponding to one-time bending arranged on the top cover plate; The positive electrode tab group is directly welded with the positive electrode post, or the positive electrode tab group is welded with the positive electrode post through a first platy switching piece; the negative electrode tab group is directly welded with the top cover plate, or the negative electrode tab group is welded with the top cover plate through a plate-shaped second adapter piece.
  2. 2. The prismatic battery of claim 1 wherein the housing further comprises a bottom plate and side plates attached to the bottom plate such that the housing defines a first cavity opening corresponding to the top plate and a second cavity opening corresponding to the side plates, the top plate being attached to the housing to close the first cavity opening, and the side plates being attached to the housing and the top plate to close the second cavity opening.
  3. 3. The prismatic cell according to claim 2, wherein said housing is of unitary construction.
  4. 4. The prismatic cell according to claim 2, wherein the first bending structure has a first bending region, the first bending region being disposed adjacent to the bottom plate and a distance between the first bending region and the bottom plate being greater than or equal to 0 and less than or equal to 3 millimeters.
  5. 5. The prismatic cell according to claim 2, wherein the second bending structure has a second bending region, the second bending region being arranged close to the bottom plate and a distance between the second bending region and the bottom plate being greater than or equal to 0 and less than or equal to 3 mm.
  6. 6. The prismatic cell according to claim 2, wherein the length of the housing is greater than or equal to 10 mm and less than or equal to 40 mm, the width of the housing is greater than or equal to 10 mm and less than or equal to 30 mm, and the height of the housing is greater than or equal to 3 mm and less than or equal to 6 mm.
  7. 7. The prismatic cell according to claim 2, wherein said top cover plate, said side cover plates and said housing are all of metallic construction.
  8. 8. A method of manufacturing a square battery according to any one of claims 1 to 7, comprising the steps of: the top cover plate is horizontally arranged, and the welding surface of the top cover plate and the welding surface of the positive pole are upwards oriented; gathering a positive electrode tab group of the battery cell to a first side of the battery cell, and placing the free end of the positive electrode tab group on a positive electrode column or a first switching sheet on the positive electrode column; Gathering a negative electrode tab group of the battery cell to the first side of the battery cell, and placing the free end of the negative electrode tab group on a top cover plate or a second switching piece on the top cover plate; welding the positive electrode tab group with the positive electrode post, or welding the positive electrode tab group with the first switching piece; Welding the negative electrode tab group with the top cover plate, or welding the negative electrode tab group with the second adapter plate; and bending the welded positive electrode tab group once to form the first bending structure, and bending the welded negative electrode tab group once to form the second bending structure.
  9. 9. The method of manufacturing a prismatic battery according to claim 7, wherein the case further comprises a bottom plate and a side cover plate, the case comprises a first cavity opening formed in correspondence with the top cover plate and a second cavity opening formed in correspondence with the side cover plate, the first bending structure is formed by bending the welded positive tab group once, and the second bending structure is formed by bending the welded negative tab group once, the method further comprises: placing the battery cell in the shell and enabling the top cover plate to cover the shell; Welding the top cover plate with the shell to close the first cavity opening; The side cover plate is covered on the shell and the top cover plate; And welding the side cover plate, the top cover plate and the shell to close the second cavity opening.
  10. 10. The method of manufacturing a prismatic battery according to claim 9, wherein the case, the top cover plate, or the side cover plate is provided with a liquid injection hole communicating with the inside of the case, and the step of welding the side cover plate, the top cover plate, and the case to close the second aperture is followed by: electrolyte is injected into the shell through the liquid injection hole, and the liquid injection hole is sealed by a sealing nail.

Description

Square battery and its manufacturing method Technical Field The invention relates to the field of batteries, in particular to a square battery and a manufacturing method thereof. Background In some existing metal-case batteries, a pole is usually riveted on a housing, so that in order to ensure that the laser welding path of a transfer sheet is not blocked, the length of the transfer sheet is generally kept longer to ensure that the path of a stacked core (winding core) is not blocked when the stacked core (winding core) is far away from the laser welding transfer sheet. When the folded core (rolled core) is turned into the shell, the folded connection sheet and the tab group are required to be synchronously folded, and the longer connection sheet is required to ensure that the folded core (rolled core) cannot interfere with the shell and the tab cannot be pulled when the folded core (rolled core) is turned into the shell. After the battery is put into the shell, the two bending parts of the switching sheet and the tab group occupy more space inside the battery, so that the space utilization rate inside the battery core is reduced. Disclosure of Invention The invention aims to provide a square battery and a manufacturing method thereof, which are used for solving the problem that the space utilization rate in a battery core is reduced due to two bending of a switching sheet and a tab group in the prior art. In order to achieve the above purpose, the square battery comprises a shell and a battery core arranged in the shell, wherein the shell comprises a top cover plate, a positive pole post is arranged on the top cover plate, the positive pole post and the top cover plate are arranged in an insulating mode, the battery core comprises a positive pole tab group and a negative pole tab group, the positive pole tab group and the negative pole tab group are both positioned at one end of the battery core towards the top cover plate, the positive pole tab group gathers towards a first side of the battery core and forms a first bending structure corresponding to one bending of the positive pole post, the negative pole tab group gathers towards the first side of the battery core and forms a second bending structure corresponding to one bending of the top cover plate, the positive pole tab group is directly welded and connected with the positive pole post, or the positive pole tab group and the positive pole post are connected through a first transfer welding mode, and the negative pole tab group and the top cover plate are directly connected, or the negative pole tab group and the top cover plate are connected through a second transfer tab. Preferably, the shell further comprises a shell body and a side cover plate, the shell body comprises a bottom plate and a connecting side plate arranged on the bottom plate, so that the shell body forms a first cavity opening corresponding to the top cover plate and a second cavity opening corresponding to the side cover plate, the top cover plate is arranged on the shell body in a covering mode to seal the first cavity opening, and the side cover plate is arranged on the shell body and the top cover plate in a covering mode to seal the second cavity opening. Preferably, the housing is of unitary construction. Preferably, the first bending structure has a first bending region, the first bending region is disposed close to the bottom plate, and a distance between the first bending region and the bottom plate is greater than or equal to 0 and less than or equal to 3 millimeters. Preferably, the second bending structure has a second bending region, the second bending region is disposed close to the bottom plate, and a distance between the second bending region and the bottom plate is greater than or equal to 0 and less than or equal to 3 millimeters. Preferably, the length of the shell is greater than or equal to 10mm and less than or equal to 40 mm, the width of the shell is greater than or equal to 10mm and less than or equal to 30 mm, and the height of the shell is greater than or equal to 3mm and less than or equal to 6 mm. Preferably, the top cover plate, the side cover plates and the housing are all of metal structure. The embodiment of the invention also provides a manufacturing method of the square battery, which comprises the following steps of horizontally arranging a top cover plate, enabling a welding surface of the top cover plate and a welding surface of a positive pole to face upwards, gathering a positive pole tab group of a battery core to a first side of the battery core, enabling a free end of the positive pole tab group to be arranged on the positive pole post or a first switching piece on the positive pole post, gathering a negative pole tab group of the battery core to the first side of the battery core, enabling the free end of the negative pole tab group to be arranged on a second switching piece on the top cover plate or the top cover plate, enabling the pos