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EP-4243196-B1 - BATTERY, AND BATTERY PACK AND VEHICLE COMPRISING THE SAME

EP4243196B1EP 4243196 B1EP4243196 B1EP 4243196B1EP-4243196-B1

Inventors

  • JO, MIN-KI
  • JUNG, Ji-Min
  • MIN, GEON-WOO
  • KIM, JAE-WOONG
  • KANG, BO-HYUN
  • KIM, DO-GYUN
  • CHOI, Su-Ji
  • HWANGBO, KWANG-SU
  • LIM, HAE-JIN
  • LIM, JAE-WON
  • KIM, HAK-KYUN
  • LEE, JE-JUN

Dates

Publication Date
20260513
Application Date
20220218

Claims (20)

  1. A battery pack (3), comprising: a plurality of batteries (1) arranged in columns and rows and a plurality of busbars (150) arranged between adjacent columns of the plurality of batteries (1), wherein the busbars (150) connect batteries (1) arranged in respective ones of the columns in parallel and connect batteries (1) arranged in two adjacent columns in series, wherein each of the batteries (1) comprises: an electrode assembly (10) including a first electrode and a second electrode and a separator interposed between the first electrode and the second electrode, the first electrode, the second electrode and the separator being wound around a winding axis to define a core and an outer peripheral surface, wherein the first electrode and the second electrode include a first uncoated region (11) and a second uncoated region (12) along a winding direction, respectively, and an active material layer coating is absent in the first uncoated region (11) and the second uncoated region (12); a housing (20) having a cylindrical structure for receiving the electrode assembly (10) through an opening of the housing (20) formed at a bottom and having a closed portion on a top of the housing (20), wherein the housing (20) is electrically connected to the first uncoated region (11); a first current collector (30) coupled to the first uncoated region (11) and disposed within the housing (20); a cap (40) covering the opening; a spacer (50) interposed between the cap (40) and the electrode assembly (10) and configured to fix the electrode assembly (10) and to seal the housing (20); and a terminal (60) electrically connected to the second uncoated region (12) and passing through the closed portion of the housing (20), wherein each of the plurality of busbars (150) includes: a body portion (151) extending between adjacent columns of batteries (1) or along a respective one of the columns of batteries (1); a plurality of first busbar terminals (152) extending in a direction from the body portion (151) to terminals (60) of the batteries (1) of a given column of the batteries (1) and electrically coupled to the terminals (60) of the batteries (1); and a plurality of second busbar terminals (153) extending in an opposite direction from the body portion (151) and electrically coupled to outer surfaces (20a) of the closed portions of the housings (20) of the batteries (1) provided in a column of batteries (1) that is adjacent to said given column of batteries (1).
  2. The battery pack (3) according to claim 1, wherein the spacer (50) includes: a movement prevention portion (51) between the first current collector (30) and the cap (40); a sealing portion (52) between the housing (20) and the cap (40); and a connection portion (53) connecting the movement prevention portion (51) to the sealing portion (52).
  3. The battery pack (3) according to claim 2, wherein a height of the movement prevention portion corresponds to a distance between the first current collector (30) and the cap (40).
  4. The battery pack (3) according to claim 2, wherein the movement prevention portion (51) is at a center on one surface of the electrode assembly (10).
  5. The battery pack (3) according to claim 2, wherein the movement prevention portion (51) includes a spacer hole at a location corresponding to a winding center hole of the electrode assembly (10).
  6. The battery pack (3) according to claim 2, wherein the sealing portion (52) extends along an inner periphery of the housing (20).
  7. The battery pack (3) according to claim 6, wherein the housing (20) includes: a beading portion (21) formed by press-fitting an outer periphery; and a crimping portion (22) of which an end of the housing (20) defining the opening is extended and bent to surround edges of the cap (40) below the beading portion (21).
  8. The battery pack (3) according to claim 7, wherein the sealing portion (52) is bent along the crimping portion (22) and surrounds the edges of the cap (40).
  9. The battery pack (3) according to claim 2, wherein the connection portion (53) includes a plurality of extension legs (53a) extending from the movement prevention portion (51) in a radial or crisscross shape or a combined shape thereof.
  10. The battery pack (3) according to claim 9, wherein the plurality of extension legs (53a) is configured to avoid contacting the first current collector (30).
  11. The battery pack (3) according to claim 9, wherein the plurality of extension legs (53a) is configured to maintain a distance from the cap (40).
  12. The battery pack (3) according to claim 9, wherein the first current collector (30) includes: a support portion (31) at a center on a surface of the electrode assembly (10); a uncoated region coupling portion extending from the support portion (31) and coupled to the first uncoated region (11); and a housing contact portion (33) extending from the support portion (31) or an end of the uncoated region coupling portion and interposed between the housing (20) and the sealing portion (52).
  13. The battery pack (3) according to claim 12, wherein the support portion (31) includes a first current collector hole at a location corresponding to a winding center hole of the electrode assembly (10).
  14. The battery pack (3) according to claim 12, wherein the housing (20) includes: a beading portion (21) of which part of sidewall is press-fit inward; and a crimping portion (22) of which an end of the housing (20) defining the opening is extended and bent around edges of the cap (40) below the beading portion (21), and wherein the housing contact portion (33) contacts a surface of the beading portion (21) facing the cap (40).
  15. The battery pack (3) according to claim 14, wherein the sealing portion (52) is bent along the crimping portion (22), and fills in between the housing contact portion (33) and the cap (40) while surrounding the edges of the cap (40).
  16. The battery pack (3) according to claim 15, wherein the sealing portion (52) has a smaller thickness between the housing contact portion (33) and the cap (40) which than a thickness between the beading portion (21) and the cap (40).
  17. The battery pack (3) according to claim 15, wherein a compression ratio of the sealing portion (52) between the housing contact portion (33) and the cap (40) is larger than a compression ratio of the sealing portion (52) between the beading portion (21) and the cap (40).
  18. The battery pack (3) according to claim 15, wherein a compression ratio of the sealing portion (52) between the housing contact portion (33) and the cap (40) is equal to a compression ratio of the sealing portion (52) between the beading portion (21) and the cap (40).
  19. The battery pack (3) according to claim 12, wherein the movement prevention portion (51) covers the support portion (31) to prevent the support portion (31) from being exposed to outside of the movement prevention portion (51).
  20. The battery pack (3) according to claim 2, wherein the cap (40) includes a venting portion (41) having a smaller thickness than its surrounding area, and the movement prevention portion (51) is disposed at an inner position than the venting portion (41) to prevent the movement prevention portion (51) from covering the venting portion (41).

Description

TECHNICAL FIELD The present disclosure relates to a battery, and a battery pack and a vehicle comprising the same. More particularly, the present disclosure relates to a battery having a structure capable of minimizing the movement of an electrode assembly inside thereof, and a battery pack and a vehicle comprising the same. BACKGROUND ART In a battery, a jelly roll having a positive electrode tab and a negative electrode tab extending upward and downward along the longitudinal direction of a housing respectively may be applied to maximize the current collection efficiency. In the battery to which the jelly roll having this structure is applied, a current collector may be used as an intermediary to connect the positive electrode tab and the negative electrode tab to a terminal and the housing respectively. In this case, for example, the positive electrode current collector may be coupled to the positive electrode tab while covering one surface of the jelly roll, and the negative electrode current collector may be coupled to the negative electrode tab while covering the other surface of the jelly roll. Additionally, the positive electrode current collector may be electrically connected to the terminal, and the negative electrode current collector may be electrically connected to the housing. The battery having the above-described structure may have a relatively large empty space, in particular, between the negative electrode current collector and a cap. Additionally, an empty space may be formed between the bottom of the housing disposed opposite the cap and the positive electrode current collector. These empty spaces may cause the jelly roll to move within the housing, in particular, along the vertical direction, i.e., the heightwise direction of the battery. When the jelly roll moves in the vertical direction, damage may occur to the coupling part between the current collector and the electrode tab, and moreover, damage may occur to the coupling part between the current collector and the housing and the coupling part between the current collector and the terminal. Accordingly, it is necessary to minimize the movement space of the jelly roll. Additionally, when an additional component is applied to reduce the movement space of the jelly roll, the procedural complexity may increase and the manufacturing cost may rise, and accordingly there is a need to solve the problem by making use of the existing component. EP 4 293 802 A1, which constitutes prior art pursuant to Art. 54(3) EPC, discloses a cylindrical battery, which includes an electrode assembly; a battery housing accommodating the electrode assembly; a first current collecting plate coupled to the first uncoated portion and located within the battery housing; a cap plate covering the open portion; a sealing spacer configured to prevent the electrode assembly from moving and to enhance the sealing force of the battery housing; an electrode terminal electrically connected to the second uncoated portion; and an insulating gasket interposed between the electrode terminal and the perforated hole, and the electrode terminal includes a body portion; an outer flange portion extending along an outer surface of the closed portion from a circumference of one side of the body portion; an inner flange portion configured to extend from a circumference of the other side of the body portion; and a flat portion provided on an inner side of the inner flange portion. CN 113346201 A discloses a cylindrical battery. The cylindrical battery comprises a shell, a battery cell, a pole, a cover plate, a positive collector plate and a negative collector plate, the shell is of a cylindrical groove structure, and the battery cell, the positive collector plate and the negative collector plate are all arranged in the shell. The cover plate is connected with the notch of the shell. The pole is riveted with the shell, the pole penetrates into the shell from the bottom end face of the shell, and an insulating sealing piece is arranged between the pole and the shell. The battery cell is of a full-tab structure, the two end faces of the battery cell are connected with the positive collector plate and the negative collector plate respectively, the end, located in the shell, of the pole is electrically connected with the battery cell through the positive collector plate, and the shell is electrically connected with the negative collector plate. The disclosure also relates to a battery module. The battery module comprises the cylindrical battery. The disclosure also relates to a battery pack. The battery pack comprises the battery module. US 2014/186692 A1 discloses a rechargeable battery. In one aspect, the battery includes an electrode assembly having an uncoated region, a case accommodating the electrode assembly therein and an insulation plate disposed on the uncoated region of the electrode assembly. The battery also includes a gasket formed on the insulation plate, wherein the gasket