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CN-122000203-A - Capacitor core group and capacitor

CN122000203ACN 122000203 ACN122000203 ACN 122000203ACN-122000203-A

Abstract

The invention provides a capacitor core group and a capacitor, and relates to the technical field of electronic components, wherein the capacitor core group comprises a first electrode, a second electrode and a plurality of single-core groups, each single-core group comprises a first connecting piece, a second connecting piece and a plurality of capacitance elements, one ends of the plurality of capacitance elements are connected through the first connecting piece, and the other ends of the plurality of capacitance elements are connected through the second connecting piece so as to form parallel connection of the plurality of capacitance elements; the first connecting pieces of the plurality of single-core groups are respectively connected with the first electrode, and the second connecting pieces of the plurality of single-core groups are respectively connected with the second electrode so as to form a parallel connection of the plurality of single-core groups. Therefore, the inductance is reduced by the double parallel connection mode, and the current paths are dispersed, so that current flows from the upper layer element to the lower layer element at high frequency, the current sharing degree of the capacitor is improved, the current of the capacitor is prevented from being too concentrated, the local heating and heat concentration can be reduced, and the capacitor is ensured to meet the temperature rise requirement.

Inventors

  • PAN ZHEN
  • XIA YUQUAN
  • LI XIAOJUN
  • CAI JIE

Assignees

  • 宁波市江北九方和荣电气有限公司

Dates

Publication Date
20260508
Application Date
20260316

Claims (10)

  1. 1. The capacitor core group is characterized by comprising a first electrode (1), a second electrode (2) and a plurality of single-core groups (3), wherein each single-core group (3) comprises a first connecting piece (31), a second connecting piece (32) and a plurality of capacitor elements (33), one ends of the capacitor elements (33) are connected through the first connecting piece (31), the other ends of the capacitor elements are connected through the second connecting piece (32) to form a plurality of parallel connection of the capacitor elements (33), the first connecting pieces (31) of the single-core groups (3) are respectively connected to the first electrode (1), and the second connecting pieces (32) of the single-core groups (3) are respectively connected to the second electrode (2) to form a plurality of parallel connection of the single-core groups (3).
  2. 2. The capacitor core pack according to claim 1, wherein in each of the single core packs (3), a plurality of the capacitor elements (33) are divided into a first capacitor pack and a second capacitor pack, the first connecting member (31) includes a first connecting piece (311) and a third connecting piece (312), the second connecting member (32) includes a second connecting piece (321) and a fourth connecting piece (322), one end of the plurality of the capacitor elements (33) in the first capacitor pack is connected by the first connecting piece (311), the other end is connected by the second connecting piece (321), one end of the plurality of the capacitor elements (33) in the second capacitor pack is connected by the third connecting piece (312), and the other end is connected by the fourth connecting piece (322).
  3. 3. The capacitor core group according to claim 2, characterized in that the first connection tab (311) is arranged symmetrically to the third connection tab (312) and/or the second connection tab (321) is arranged symmetrically to the fourth connection tab (322).
  4. 4. The capacitor core group according to claim 2, characterized in that the degree of overlap of the first connection tab (311) and the third connection tab (312) is greater than or equal to 50%, and/or the degree of overlap of the second connection tab (321) and the fourth connection tab (322) is greater than or equal to 50%.
  5. 5. The capacitor core group according to claim 2, wherein the first connection tab (311) includes a first connection portion (3111), a first bent portion (3112), and a second bent portion (3113) connected in this order, one end of the plurality of capacitor elements (33) in the first capacitor group are connected by the first connection portion (3111), the first bent portion (3112) is located at one side of the first connection portion (3111) in a first direction, and the second bent portion (3113) is located at one side of the first connection portion (3111) in a second direction and is overlapped with the first electrode (1); And/or the second connecting piece (321) comprises a second connecting portion (3211), a third bending portion (3212) and a fourth bending portion (3213) which are sequentially connected, the other ends of the plurality of capacitive elements (33) in the first capacitive group are connected through the second connecting portion (3211), the third bending portion (3212) is located at one side of the second connecting portion (3211) along the first direction, and the fourth bending portion (3213) is located at one side of the second connecting portion (3211) along the second direction and is lapped on the second electrode (2); wherein the first direction is perpendicular to the second direction.
  6. 6. The capacitor core pack according to claim 1, further comprising an insulating sheet (4), the first electrode (1), the insulating sheet (4) and the second electrode (2) being sequentially stacked on one side of a plurality of the single core packs (3), and the second electrode (2) being located on one side of the insulating sheet (4) close to the single core packs (3).
  7. 7. The capacitor core pack according to claim 6, wherein the first electrode (1) is convexly provided with a first plugging portion (11), the second electrode (2) is convexly provided with a second plugging portion (21), the second plugging portion (21) penetrates through the insulating sheet (4) and the first electrode (1), and the first plugging portion (11) and the second plugging portion (21) are located on one side of the first electrode (1) away from the second electrode (2) and are respectively used for being plugged into a circuit board.
  8. 8. Capacitor core group according to claim 6, characterized in that the orthographic projection of the first electrode (1) and the second electrode (2) on the insulating sheet (4) is located within the contour of the insulating sheet (4).
  9. 9. The capacitor core pack according to claim 6, further comprising an insulating pressure plate (5), wherein the insulating pressure plate (5) is provided between the second electrode (2) and the capacitive element (33), and a side of the second electrode (2) away from the insulating sheet (4) is bonded to the insulating pressure plate (5).
  10. 10. A capacitor comprising a capacitor core set according to any one of claims 1-9.

Description

Capacitor core group and capacitor Technical Field The invention relates to the technical field of electronic components, in particular to a capacitor core group and a capacitor. Background The thin film capacitor is used as a core device of the converter, plays a vital role in the system, and meanwhile, as the switching frequency of the switching device is higher, the requirement on the resonance frequency of the capacitor is higher. At present, for a conventional capacitor, the higher the resonant frequency is, the more concentrated the capacitor heats up and the higher the hottest spot temperature is, so that the hottest spot temperature of the whole system is also higher and higher, and the service life of the capacitor and the system is further affected. In addition, under high frequency, current is difficult to flow from the uppermost element to the bottom element, and at most flows to the second element, so that the uppermost element needs to bear about 70% of current, and meanwhile, the current of the capacitor is too concentrated, so that local heating and heat concentration are caused, and the temperature rise requirement cannot be met. Disclosure of Invention The invention solves the problem of how to avoid too concentrated current of the capacitor. In order to solve the above problems, the present invention provides a capacitor core pack and a capacitor. In a first aspect, the invention provides a capacitor core group, which comprises a first electrode, a second electrode and a plurality of single-core groups, wherein each single-core group comprises a first connecting piece, a second connecting piece and a plurality of capacitance elements, one ends of the plurality of capacitance elements are connected through the first connecting piece, the other ends of the plurality of capacitance elements are connected through the second connecting piece to form a plurality of parallel connection of the capacitance elements, the first connecting pieces of the plurality of single-core groups are respectively connected with the first electrode, and the second connecting pieces of the plurality of single-core groups are respectively connected with the second electrode to form a plurality of parallel connection of the single-core groups. Optionally, in each single-core group, the plurality of capacitance elements are divided into a first capacitance group and a second capacitance group, the first connecting piece comprises a first connecting piece and a third connecting piece, the second connecting piece comprises a second connecting piece and a fourth connecting piece, one ends of the plurality of capacitance elements in the first capacitance group are connected through the first connecting piece, the other ends of the plurality of capacitance elements in the second capacitance group are connected through the second connecting piece, one ends of the plurality of capacitance elements in the second capacitance group are connected through the third connecting piece, and the other ends of the plurality of capacitance elements in the second capacitance group are connected through the fourth connecting piece. Optionally, the first connecting piece and the third connecting piece are symmetrically arranged, and/or the second connecting piece and the fourth connecting piece are symmetrically arranged. Optionally, the overlapping degree of the first connecting piece and the third connecting piece is greater than or equal to 50%, and/or the overlapping degree of the second connecting piece and the fourth connecting piece is greater than or equal to 50%. Optionally, the first connecting piece includes a first connecting portion, a first bending portion and a second bending portion that are sequentially connected, one ends of the plurality of capacitive elements in the first capacitive group are connected through the first connecting portion, the first bending portion is located at one side of the first connecting portion along a first direction, and the second bending portion is located at one side of the first connecting portion along a second direction and is overlapped with the first electrode; and/or the second connecting piece comprises a second connecting part, a third bending part and a fourth bending part which are sequentially connected, the other ends of the plurality of capacitance elements in the first capacitance group are connected through the second connecting part, the third bending part is positioned at one side of the second connecting part along the first direction, and the fourth bending part is positioned at one side of the second connecting part along the second direction and is lapped on the second electrode; wherein the first direction is perpendicular to the second direction. Optionally, the capacitor core group further includes an insulating sheet, the first electrode, the insulating sheet, and the second electrode are sequentially stacked on one side of the single core group, and the second ele