Search

KR-20260066020-A - BATTERY MODULE AND BATTERY PACK INCLUDING THE SAME

KR20260066020AKR 20260066020 AKR20260066020 AKR 20260066020AKR-20260066020-A

Abstract

A battery module according to one embodiment of the present invention comprises: a battery cell stack in which a plurality of battery cells including electrode leads are stacked; a module frame that accommodates the battery cell stack; and a busbar frame located in the direction of protrusion of the electrode leads protruding from the battery cells, wherein a protrusion is formed on one of the busbar frame and the module frame, and an insertion hole into which the protrusion is inserted is formed on the other.

Inventors

  • 김민섭
  • 성준엽
  • 최종화

Assignees

  • 주식회사 엘지에너지솔루션

Dates

Publication Date
20260512
Application Date
20260422

Claims (8)

  1. A battery cell stack comprising 32 to 48 plurality of battery cells, each including an electrode lead, stacked in one direction; A module frame housing the above battery cell stack; and It includes a busbar frame that is positioned in the protruding direction of the electrode lead protruding from the battery cell and is formed to be extended in one direction. A plurality of protrusions are formed on one of the busbar frame and the module frame, and a plurality of insertion holes are formed in the other, into which the plurality of protrusions are each inserted. The above module frame includes an upper cover that covers the upper surface of the battery cell stack, and The upper cover is formed with a portion extending outward to correspond to the shape of the end plate, and A battery module that covers the busbar frame, wherein the above plurality of protrusions are inserted into each of the above plurality of insertion holes, and the end plate is aligned based on the extended formed portion.
  2. In paragraph 1, The above-mentioned extended formed part is, A battery module extending horizontally from the upper cover toward the end plate.
  3. In paragraph 2, A battery module in which, based on the direction from the lower surface of the battery cell stack toward the upper surface, the extended formed portion is aligned with at least a portion of the upper surface of the end plate.
  4. In paragraph 1, The above module frame further includes a frame that covers the lower surface of the battery cell stack, and The above frame is a battery module in which a portion of it is formed to extend outwardly to correspond to the shape of the end plate.
  5. In paragraph 4, The extended portion of the upper cover is formed to extend horizontally from the upper cover toward the end plate, and The extended portion of the above frame is a battery module that extends horizontally from the frame toward the end plate.
  6. In paragraph 5, Based on the direction from the lower surface toward the upper surface of the above battery cell stack, The extended portion formed of the upper cover is aligned with at least a portion of the upper surface of the end plate, and The extended portion of the above frame is aligned with at least a portion of the lower surface of the end plate of the battery module.
  7. In paragraph 6, A battery module in which the end plate covers the busbar frame, such that at least a portion of the upper surface of the end plate is aligned with the extended portion of the upper cover, and at least a portion of the lower surface of the end plate is aligned with the extended portion of the frame.
  8. A battery pack including a battery module according to paragraph 1.

Description

Battery module and battery pack including the same The present invention relates to a battery module and a battery pack including the same, and more specifically, to a battery module having a busbar frame and a battery pack including the same. In modern society, as the use of portable devices such as mobile phones, laptops, camcorders, and digital cameras has become commonplace, the development of technologies related to such mobile devices is becoming active. Furthermore, rechargeable secondary batteries are being utilized as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs) as a solution to address air pollution caused by conventional gasoline vehicles using fossil fuels; consequently, the need for the development of secondary batteries is increasing. Currently commercialized rechargeable batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium-ion batteries. Among these, lithium-ion batteries are gaining attention for their advantages, such as the ability to charge and discharge freely with almost no memory effect compared to nickel-based batteries, a very low self-discharge rate, and high energy density. These lithium secondary batteries primarily use lithium-based oxides and carbon materials as the positive and negative active materials, respectively. The lithium secondary battery comprises an electrode assembly in which a positive plate and a negative plate, each coated with the positive and negative active materials, are arranged with a separator in between, and a battery case that seals and houses the electrode assembly together with an electrolyte. Generally, lithium secondary batteries can be classified according to the shape of the casing into can-type secondary batteries, in which the electrode assembly is embedded in a metal can, and pouch-type secondary batteries, in which the electrode assembly is embedded in a pouch of aluminum laminate sheet. In the case of secondary batteries used in small devices, 2 to 3 battery cells are arranged, whereas in the case of secondary batteries used in medium to large devices such as automobiles, battery modules in which multiple battery cells are electrically connected are used. In such battery modules, capacity and output are improved by connecting multiple battery cells in series or parallel to form a stack of battery cells. Additionally, one or more battery modules can be mounted together with various control and protection systems, such as a Battery Management System (BMS) and a cooling system, to form a battery pack. Figure 1 is an exploded perspective view of a conventional battery module. Referring to FIG. 1, a conventional battery module (10) may include a battery cell stack (12) formed by stacking a plurality of battery cells (11), a monoframe (20) that houses the battery cell stack (12), and an end plate (40) that covers both open sides of the monoframe (20). A busbar frame (30) may be positioned between the battery cell stack (12) and the end plate (40). The busbar frame (30) can cover the front and rear of the battery cell stack (12) and simultaneously guide electrical connections between the battery cells (11). Specifically, a busbar (31) can be mounted on the busbar frame (30), and the electrode lead (13) of the battery cell (11) can pass through a slit formed in the busbar frame (30) and then be electrically connected to the busbar (31). Through this, the battery cells (11) can be connected in series or in parallel. At this time, the busbar frame (30) can be composed of an injection-molded member, but as the size of the battery module (10) increases, the busbar frame (30) may bend. In particular, the busbar frame (30) frequently bends in the direction in which the battery cell stack (12) is located, that is, in the x-axis direction. If the busbar frame (30) bends, it becomes difficult to assemble the busbar frame (30) with parts such as the mono frame (20) and end plate (40), and parts such as the busbar (31) or connector (not shown) cannot be stably mounted on the busbar frame (30). In addition, pressure due to the bending phenomenon is applied to the electrode lead (13), and manufacturing defects may occur. Figure 1 is an exploded perspective view of a conventional battery module. FIG. 2 is an exploded perspective view of a battery module according to one embodiment of the present invention. FIG. 3 is a perspective view of a battery cell included in the battery module of FIG. 2. FIG. 4 is a perspective view of a busbar frame included in the battery module of FIG. 2. FIG. 5 is a partial perspective view of a battery module with the top cover removed. FIG. 6 is a perspective view of a module frame included in the battery module of FIG. 2. FIG. 7 is a partial perspective view of a battery module with an upper cover attached. FIG. 8 is a perspective view of a busbar frame according to another embodiment of the present invention. FIG. 9 is a perspective vie