KR-20260065214-A - BATTERY PACK AND METHOD FOR THE SAME

Abstract

According to one embodiment of the present invention, the method comprises: a step in which a side beam covers both sides of a battery cell stack in which a plurality of battery cells are stacked; a step in which a gripper pin is inserted into a hole of the side beam; a step in which the gripper pin presses the battery cell stack; a step in which the gripper pin loads the battery cell stack; and a step in which the gripper pin unloads the battery cell stack into a pack frame.

Inventors

• 이순오
• 최규현
• 정창권
• 김병용
• 이승준

Assignees

• 주식회사 엘지에너지솔루션

Dates

Publication Date

20260508

Application Date

20241101

Claims (10)

1. A step in which side beams cover both sides of a battery cell stack in which a plurality of battery cells are stacked; A step of inserting a gripper pin into a hole of the side beam; A step in which the above gripper pin presses the above battery cell stack; The step of the above gripper pin loading the battery cell stack; and A method for manufacturing a battery pack, comprising the step of unloading the battery cell stack onto a pack frame using the gripper pin.
2. In paragraph 1, A method for manufacturing a battery pack, wherein the above-mentioned gripper pin has a square cross-section.
3. In paragraph 1, A method for manufacturing a battery pack, wherein the gripper pin is inserted into the side beam up to more than half the length of the battery cell in the direction in which the gripper pin is inserted into the side beam.
4. In paragraph 1, The above gripper pin is a multiple individual battery pack manufacturing method.
5. In paragraph 1, A method for manufacturing a battery pack in which the above-mentioned side beams cover both sides of a battery cell stack.
6. A method for manufacturing a battery pack according to claim 1, wherein the gripper pin is inserted into the hole of the side beam in a vertical direction.
7. A method for manufacturing a battery pack according to claim 1, wherein the gripper pin is inserted from the upper to the lower direction of the side beam.
8. A method for manufacturing a battery pack according to claim 1, wherein the hole of the side beam has a tapered shape.
9. A method for manufacturing a battery pack according to claim 1, wherein the gripper pin includes an automatic locking structure that automatically locks when inserted into a side beam to a depth greater than a certain depth.
10. A battery pack manufactured by the battery pack manufacturing method according to claim 1.

Description

Battery Pack and Method for Manufacturing the Same The present invention relates to a battery pack and a method for manufacturing the same, and more specifically, to a battery pack and a method for manufacturing the same in which a battery cell stack is stably fixed and assembled using a gripper pin and a side beam. 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, a battery pack in which multiple battery cells are electrically connected is used. In such battery packs, capacity and output are improved by connecting multiple battery cells in series or parallel to form a stack of battery cells. In addition, the battery pack can be mounted together with various control and protection systems, such as a Battery Disconnect Unit (BDU), a Battery Management System (BMS), and a cooling system, to form a battery system. During the assembly process of the battery cell stack, there is a possibility that the positions of the cells may become misaligned due to minute positional shifts or external impacts, which can negatively affect the performance and lifespan of the battery pack. In particular, if pressure is not evenly distributed between the cells or if the cells are deformed due to external vibrations or shocks, the cooling performance and electrical connectivity of the battery pack may deteriorate. Therefore, there is a need for technology that ensures the assembly stability of battery packs, minimizes positional variations between battery cells, and improves cooling performance. Against this backdrop, a technology has been developed that uses gripper pins and side beams to secure battery cell stacks and prevent positional variations that may occur during the assembly process. FIG. 1 is a perspective view showing the step of a side beam covering both sides of a battery cell stack according to one embodiment of the present invention. FIG. 2 is a perspective view showing the step of inserting a gripper pin into a hole in a side beam. Figure 3 is a plan view showing the step of inserting a gripper pin into a hole in a side beam. FIG. 4 is a perspective view showing the gripper pin inserted into the hole of the side beam. Figure 5 is a plan view showing Figure 4 viewed from a different angle. Figure 6 is a plan view showing Figure 4 viewed from a different angle than Figure 5. FIG. 7 is a perspective cross-sectional view showing a cross-section cut along the cutting line A-A' of FIG. 5. Figure 8 is a cross-sectional view showing a cross-section cut along the cutting line A-A' of Figure 5. FIG. 9 is a cross-sectional view showing a battery cell stack, a side beam, and a gripper pin according to another embodiment of the present invention. Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference nume