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CN-115693035-B - Battery module, battery pack, electric vehicle, and method of mounting battery module

CN115693035BCN 115693035 BCN115693035 BCN 115693035BCN-115693035-B

Abstract

The present disclosure relates to a battery module including a plurality of secondary battery cells, at least one positive electrode current collector structure, and at least one negative electrode current collector structure, wherein each secondary battery cell includes an electrode assembly, a positive electrode terminal electrically connected to the positive electrode, a negative electrode terminal electrically connected to the negative electrode, and a case accommodating the electrode assembly, wherein the case includes a groove arranged along a circumference of the case, and the groove includes at least a portion of the negative electrode terminals of the secondary battery cells, and wherein the at least one negative electrode current collector structure includes at least one flat negative electrode bus bar protruding into the groove of the case of each of the at least two secondary battery cells to be connected to the negative electrode terminals of the at least two secondary battery cells.

Inventors

  • M. Nemes

Assignees

  • 三星SDI株式会社

Dates

Publication Date
20260505
Application Date
20220720
Priority Date
20210721

Claims (17)

  1. 1. A battery module (12), comprising: -a plurality of secondary battery cells (20), -at least one positive electrode current collector structure (28), -at least one negative electrode current collector structure (29 a,29 b), -a holder for holding the plurality of secondary battery cells (20), -the at least one positive electrode current collector structure (28) and the at least one negative electrode current collector structure (29 a,29 b); Wherein the method comprises the steps of Each of the secondary battery cells (20) includes an electrode assembly (41) including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, a positive electrode terminal (25) electrically connected to the positive electrode, a negative electrode terminal (23) electrically connected to the negative electrode, and a case (27) accommodating the electrode assembly (21), wherein The at least one positive current collector structure (28) is arranged to interconnect the positive terminals (25) of at least two of the plurality of secondary battery cells (20) with each other, and the at least one negative current collector structure (29 a,29 b) is arranged to interconnect the negative terminals (23) of at least two of the plurality of secondary battery cells (20) with each other, wherein The housing (27) of each of the plurality of secondary battery cells (20) comprises a groove (30), wherein the groove (30) is arranged along a circumference of the housing (27) and the groove (30) comprises at least a portion of the negative terminal (23) of the secondary battery cell (20), and wherein The at least one negative electrode current collector structure (29 a,29 b) comprises at least one flat negative electrode bus bar (42 a,42 b) arranged in a plane aligned with the circumference of the housing (27) of each of at least two of the plurality of secondary battery cells (20), wherein the at least one flat negative electrode bus bar (42 a,42 b) protrudes into the recess (30) of the housing (27) of each of the at least two secondary battery cells (20) to connect the negative electrode current collector structure (29 a,29 b) and the negative electrode terminals (23) of the at least two secondary battery cells (20) to each other.
  2. 2. The battery module (12) of claim 1, wherein The at least one negative electrode bus bar (42 a,42 b) has a thickness (T), and the recess (30) of each of the plurality of secondary battery cells (20) has a width (W), wherein the thickness (T) of the negative electrode bus bar (42 a,42 b) is greater than the width (W) of the recess (30).
  3. 3. The battery module (12) of any of the preceding claims, wherein The recess (30) of each of the plurality of secondary battery cells (20) comprises a base (33) and a side surface (34), wherein the side surface (34) comprises a protrusion (35), wherein the protrusion (35) is arranged to mechanically secure the negative bus bar (42 a,42 b) within the recess (30).
  4. 4. The battery module (12) of claim 1, wherein The negative electrode bus bar (42 a,42 b) and/or the recess (30) of each of the plurality of secondary battery cells (20) is adapted to plastically deform the negative electrode bus bar (42 a,42 b) upon insertion of the negative electrode bus bar (42 a,42 b) into the recess (30).
  5. 5. The battery module (12) of claim 1, wherein The case (27) of each of the plurality of secondary battery cells (20) has a cylindrical shape defining an axis (L), and the recess (30) of the case (27) and the negative electrode terminal (23) are arranged perpendicular to the axis (L).
  6. 6. The battery module (12) of claim 1, wherein The at least one anode current collector structure (29 a,29 b) is made of sheet metal.
  7. 7. The battery module (12) of claim 1, wherein The battery module (12) comprises two negative electrode current collector structures (29 a,29 b), each negative electrode current collector structure comprising a negative electrode bus bar (42 a,42 b), wherein the two negative electrode current collector structures (29 a,29 b) and/or the two negative electrode bus bars (42 a,42 b) are arranged on opposite side surface sections (39 a,39 b) of the housing (27) of the plurality of secondary battery cells (20).
  8. 8. The battery module (12) of claim 1, wherein The battery module (12) comprises two negative current collector structures (29 a,29 b), each negative current collector structure comprising a negative bus bar (42 a,42 b), wherein the plurality of secondary battery cells (20) are arranged between the two negative current collector structures (29 a,29 b) and/or between the two negative bus bars (42 a,42 b).
  9. 9. The battery module (12) according to any one of claims 7 or 8, wherein The plurality of secondary battery cells (20) are arranged linearly, and each of the two negative electrode current collector structures (29 a, 29 b) and/or each of the two negative electrode bus bars (42 a, 42 b) extends parallel to the linearly arranged secondary battery cells (20).
  10. 10. The battery module (12) according to any one of claims 7 or 8, wherein The recess (30) and each of the negative current collector structures (29 a, 29 b) and/or each of the negative bus bars (42 a, 42 b) of each of the plurality of secondary battery cells (20) are arranged in a same plane aligned with the circumference of the housing (27) of each of the plurality of secondary battery cells (20).
  11. 11. The battery module (12) of claim 1, wherein The at least one positive electrode current collector structure (28) and the positive electrode terminal (25) of the at least two secondary battery cells (20) of the plurality of secondary battery cells are mechanically and electrically connected to each other by being pressed against each other.
  12. 12. The battery module (12) of claim 1, wherein The at least one flat negative bus bar (42 a,42 b) and the recess (30) of the housing (27) of each of the at least two secondary battery cells (20) are aligned on the same plane.
  13. 13. A battery pack (10) comprising: the plurality of battery modules (12) according to any of the preceding claims and an interconnect (301) connecting the battery modules (12) to each other.
  14. 14. An electric vehicle (300) comprising a battery pack (10) according to claim 13.
  15. 15. A method of installing a battery module (12), comprising the steps of: Providing a plurality of secondary battery cells (20), at least one positive electrode current collector structure (28) and at least one negative electrode current collector structure (29 a,29 b); Providing a holder for holding the plurality of secondary battery cells (20), the at least one positive current collector structure (28) and the at least one negative current collector structure (29 a,29 b), Wherein each of the secondary battery cells (20) comprises an electrode assembly (41) comprising the positive electrode, the negative electrode and a separator interposed between the positive electrode and the negative electrode, a positive electrode terminal (25) electrically connected to the positive electrode, a negative electrode terminal (23) electrically connected to the negative electrode, and a housing (27) accommodating the electrode assembly (41), wherein the at least one positive electrode current collector structure (28) is arranged to interconnect the positive electrode terminals (25) of at least two of the plurality of secondary battery cells (20) with each other, and the at least one negative electrode current collector structure (29 a,29 b) is arranged to interconnect the negative electrode terminals (23) of at least two of the plurality of secondary battery cells (20) with each other, wherein the housing (27) of each of the plurality of secondary battery cells (20) comprises a recess (30), wherein the recess (30) is arranged along the circumference of the housing (27), and wherein the recess (30) comprises the at least one flat terminal (23) of the plurality of secondary battery cells (20) and the at least one negative electrode structure (29 a,42 b) comprises at least one negative electrode collector bar (29 a); Arranging the at least one flat negative electrode bus bar (42 a,42 b) in a plane aligned with the circumference of the housing (27) of each of at least two secondary battery cells (20), and -Connecting the negative current collector structure (29 a,29 b) and the negative terminals (23) of the at least two of the plurality of secondary battery cells (20) to each other by arranging the at least one flat negative bus bar (42 a,42 b) protruding into the recess (30) of the housing (27) of each of the at least two secondary battery cells (20).
  16. 16. The method of installing a battery module (12) of claim 15, wherein Arranging the at least two secondary battery cells (20) and the at least one flat negative electrode bus bar (42 a,42 b) to protrude into the recess (30) of the housing (27) of the at least two secondary battery cells (20) is performed by moving the at least two secondary battery cells (20) and the at least one flat negative electrode bus bar (42 a,42 b) relative to each other and within the plane aligned with the circumference of the housing (27).
  17. 17. The method of installing a battery module (12) of claim 15, wherein The at least one flat negative bus bar (42 a,42 b) and the recess (30) of the housing (27) of each of the at least two secondary battery cells (20) are aligned on the same plane.

Description

Battery module, battery pack, electric vehicle, and method of mounting battery module Technical Field The present disclosure relates to a battery module for an electric vehicle. The disclosure also relates to a battery pack including the battery module, an electric vehicle including the battery pack, and a method of installing the battery module. Background In recent years, vehicles for transporting goods and personnel using electric power as a motion source have been developed. Such electric vehicles are motor propelled vehicles that use energy stored in rechargeable batteries. The electric vehicle may be powered by a battery alone, or may be a hybrid vehicle powered by, for example, a gasoline generator. Further, the vehicle may include a combination of an electric motor and a conventional internal combustion engine. Typically, the electric vehicle battery EVB or traction battery is a battery used to power a battery electric vehicle BEV. Electric vehicle batteries differ from starter batteries, lighting batteries, and ignition batteries in that they are designed to deliver power for a sustained period of time. Rechargeable batteries or secondary batteries differ from primary batteries in that they can be repeatedly charged and discharged, while primary batteries only provide an irreversible conversion of chemical energy into electrical energy. Low-capacity rechargeable batteries are used as power sources for small electronic devices such as cellular phones, notebook computers, and video cameras, and high-capacity rechargeable batteries are used as power sources for electric vehicles, hybrid vehicles, and the like. Generally, a rechargeable battery includes an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, a case, also called a can, accommodating the electrode assembly, and an electrode terminal electrically connected to the electrode assembly. An electrolyte solution is injected into the case so that the battery can be charged and discharged through electrochemical reactions of the positive electrode, the negative electrode, and the electrolyte solution. The shape of the housing, e.g., cylindrical or rectangular, depends on the intended purpose of the battery. Lithium ion (and similar lithium polymer) batteries, well known by their use in laptop computers and consumer electronics, dominate the recently developed electric vehicles. Rechargeable batteries may be used as battery modules formed of a plurality of unit battery cells coupled in series and/or parallel to provide high energy content, particularly for motor drives of hybrid vehicles. That is, the battery module is formed by interconnecting electrode terminals of a plurality of unit battery cells according to the amount of electricity required and in order to realize a high-power rechargeable battery. The battery module may be constructed in a block design or a modular design. In a block design, each cell is coupled to a common current collector structure and a common battery management system, and its units are arranged in a housing. In a modular design, a plurality of battery cells are connected to form a sub-module, and several sub-modules are connected to form a battery module. In automotive applications, a battery system is typically composed of a plurality of battery modules connected in series for providing a desired voltage. Wherein the battery module may include a sub-module having a plurality of stacked battery cells, each stack including a parallel connection of the series-coupled battery cells (XpYs) or a series connection of the parallel-coupled battery cells (XsYp). The battery pack is a group of any number (preferably identical) of battery modules. They may be configured in series, parallel, or a mixture of both to provide the desired voltage, capacity, or power density. The assembly of the battery pack includes individual battery modules and interconnections providing electrical conductivity therebetween. The mechanical integration of such battery modules requires, for example, suitable mechanical connection between the individual components of the secondary battery cells and between them and the negative current collector structure. These connections must remain functional and preserved during the average life of the battery system. Furthermore, installation space requirements must be met, especially in mobile applications. The electrical connection between the individual components of the battery module (e.g., secondary battery cells) and between them and the negative current collector structure requires reliability, low transition resistance, and cost-effective mountability. CN108666466a discloses a battery module comprising a positive electrode bus structure having a positive electrode contact, a negative bus plate and an insulating reinforcing plate therebetween. The negative bus plate includes a negative electrode thr