Battery module and battery pack containing the same

Abstract

To provide a battery module capable of scattering heat and fire at a high temperature, exhausted at the time of generating an ignition phenomenon in a battery module, and provide a battery pack including the battery module.SOLUTION: A battery module according to an embodiment of the present invention, includes: a battery cell lamination body in which a plurality of battery cells is laminated; a module frame that houses each battery cell; a first bus bar frame that is housed in the module frame, and covers a front surface of the battery cell lamination body; and a second bus bar frame that is housed in the module frame, and covers a rear surface of the battery cell lamination body. A terminal bus bar is mounted to the first bus bar frame, and a module connector is mounted to the second bus bar frame. A bending part penetrating to an upper plate is formed to the module frame, and the bending part is positioned closer to the module connector than the terminal bus bar.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] [Cross - reference to Related Applications] This application claims the benefit of priority based on Korean Patent Application No. 10 - 2020 - 0161480 filed on November 26, 2020 and Korean Patent Application No. 10 - 2021 - 0161637 filed on November 22, 2021, and all the contents disclosed in the documents of the Korean patent applications are incorporated herein by reference.

[0002] The present invention relates to a battery module and a battery pack including the same, and more specifically, to a battery module with enhanced stability and a battery pack including the same.

Background Art

[0003] As the development of technology for mobile devices and the demand for them increase, the demand for secondary batteries as an energy source has been rapidly increasing. Therefore, many studies on secondary batteries that can meet various requirements have been conducted.

[0004] Secondary batteries have received great attention not only as an energy source for mobile devices such as mobile phones, digital cameras, and laptop computers, but also as an energy source for power devices such as electric bicycles, electric vehicles, and hybrid electric vehicles.

[0005] Recently, the need for large - capacity secondary battery structures, including their use as an energy storage source for secondary batteries, has increased, and the demand for medium - to large - sized module - structured battery packs formed by aggregating battery modules in which a large number of secondary batteries are connected in series / parallel has been increasing.

[0006] On the other hand, when configuring a battery pack by connecting multiple battery cells in series or parallel, it is common to configure a battery module consisting of at least one battery cell, and then use at least one battery module to add other components and configure the battery pack. Since the battery cells that make up such medium- and large-sized battery modules are composed of rechargeable secondary batteries, such high-power, high-capacity secondary batteries generate a large amount of heat during the charging and discharging process.

[0007] The battery module includes a battery cell stack in which multiple battery cells are stacked, a frame that houses the battery cell stack, and end plates that cover the front and rear surfaces of the battery cell stack.

[0008] Figure 1 is a diagram showing the state of a battery module in a conventional battery pack when it catches fire. Figure 2 is section AA of Figure 1, and is a diagram showing the flames that affect adjacent battery modules when a battery module in a conventional battery pack catches fire.

[0009] Referring to Figures 1 and 2, a conventional battery module includes a battery cell stack in which multiple battery cells 10 are stacked, a frame 20 that houses the battery cell stack, end plates 30 formed on the front and rear surfaces of the battery cell stack, and terminal bus bars 40 that protrude from the outside of the end plates.

[0010] The frame 20 and the end plate 30 can be joined together so as to be sealed through welding. When the frame 20 and the end plate 30 that house the battery cell stack are joined in this way, if the internal pressure of the battery cell 10 increases during overcharging of the battery module and exceeds the limit of the fusion strength of the battery cell 10, the high-temperature heat, gas, and flame generated in the battery cell 10 may be discharged to the outside of the battery cell 10.

[0011] At this time, the high-temperature heat, gas, and flame can be discharged through the openings formed in the end plate 30. However, in a battery pack structure in which multiple battery modules are arranged so that the end plates 30 face each other, the battery module emitting the high-temperature heat, gas, and flame may affect adjacent battery modules. This may damage the terminal busbars 40 formed in the end plate 30 of adjacent battery modules, and the high-temperature heat, gas, and flame may enter the inside of the battery modules through the openings formed in the end plate 30 of adjacent battery modules, damaging multiple battery cells 10. [Overview of the Initiative] [Problems that the invention aims to solve]

[0012] The problem that this invention aims to solve is to provide a battery module and a battery pack including the same that can disperse the high-temperature heat and flames emitted when an ignition phenomenon occurs within the battery module.

[0013] However, the problems that the embodiments of the present invention aim to solve are not limited to those described above, and can be broadly expanded within the scope of the technical ideas included in the present invention. [Means for solving the problem]

[0014] A battery module according to one embodiment of the present invention includes a battery cell stack in which a plurality of battery cells are stacked, a module frame housing the battery cell stack, a first busbar frame housed in the module frame and covering the front surface of the battery cell stack, and a second busbar frame housed in the module frame and covering the rear surface of the battery cell stack, wherein a terminal busbar is mounted on the first busbar frame, a module connector is mounted on the second busbar frame, and a venting portion is formed in the module frame that penetrates an upper plate, and the venting portion is located closer to the module connector than the terminal busbar.

[0015] The venting portion is a hole structure formed in the upper plate, and the hole structure can penetrate the upper plate diagonally in a direction closer to the second busbar frame.

[0016] The terminal busbar may be connected to an external busbar that provides connectivity to other battery modules adjacent to the battery module containing the terminal busbar.

[0017] The venting section may be formed to vent gas in the direction in which the second busbar frame is located.

[0018] The venting section is formed on the upper surface of the module frame and includes an inlet facing the battery cell stack and an outlet for discharging the gas that has flowed in through the inlet, the outlet may be formed in a direction perpendicular to the inlet.

[0019] The venting portion includes a connecting portion formed between the inlet and the outlet, which guides the gas flowing into the inlet in the direction of the outlet, and the upper surface of the connecting portion may be formed at an angle.

[0020] The venting portion may be formed to vent upward with respect to the battery cell stack.

[0021] The venting portion is connected to the battery cell stack and includes an inlet formed upward on the upper surface of the module frame, an outlet formed upward for discharging gas that has flowed in through the inlet, and a connecting portion connecting the inlet and the outlet, wherein the connecting portion may be formed perpendicular to the inflow and outflow directions of the inlet and the outlet.

[0022] A discharge passage can be formed between the upper part of the module frame and the battery cell stack.

[0023] A battery pack according to another embodiment of the present invention includes the battery module described above.

Advantages of the Invention

[0024] According to the embodiment, when a thermal runaway phenomenon occurs in the battery module, in order to control high-temperature heat, gas, and flames, a bending portion is formed at the upper end of the battery module so as to be adjacent to a module connector disposed on one side of the battery module rather than a terminal bus bar disposed on the other side of the battery module, whereby the propagation of flames to an adjacent battery module can be delayed.

[0025] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Brief Description of the Drawings

[0026] [Figure 1] It is a drawing showing a state at the time of ignition of a battery module mounted on a conventional battery pack. [Figure 2] It is a drawing showing a state of flames that affect an adjacent battery module at the time of ignition of a battery module mounted on a conventional battery pack, which is a portion cut along A-A in FIG. 1. [Figure 3] It is a perspective view showing a battery module according to an embodiment of the present invention. [Figure 4] It is an exploded perspective view of the battery module in FIG. 3. [Figure 5] It is a perspective view of a battery cell included in the battery module in FIG. 4. [Figure 6] It is a perspective view showing the second end plate of the battery module in FIG. 3 at an angle so that it can be seen from the front. [Figure 7] It is a cross-sectional view cut along the cutting line B-B in FIG. 3. [Figure 8] It is a perspective view showing a battery module according to another embodiment of the present invention. [Figure 9]This is a perspective view showing a battery module according to yet another embodiment of the present invention. [Modes for carrying out the invention]

[0027] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings, so that they can be easily implemented by a person with ordinary skill in the art to which the present invention pertains. The present invention can be realized in a variety of different forms and is not limited to the embodiments described herein.

[0028] To clearly explain the present invention, unnecessary explanatory parts have been omitted, and the same or similar reference numerals have been used throughout the specification for identical or similar components.

[0029] Furthermore, the dimensions and thicknesses of each component shown in the drawings are arbitrary for the sake of explanation, and the present invention is not necessarily limited to what is shown. In the drawings, the thicknesses are shown enlarged to clearly represent multiple layers and regions. Also, in the drawings, the thicknesses of some layers and regions are shown exaggerated for the sake of explanation.

[0030] Furthermore, when a part such as a layer, membrane, region, or plate is said to be "above" another part, this includes not only the case where it is "directly above" the other part, but also the case where there is another part in between. Conversely, when one part is said to be "directly above" another part, it means that there is no other part in between. Also, being "above" a reference part means being located above or below the reference part, and does not necessarily mean being located "above" in the opposite direction of gravity.

[0031] Furthermore, when a specification states that a certain part "includes" a certain component, unless otherwise stated, this means that other components are not excluded and that other components may be included.

[0032] Furthermore, throughout the specification, "on a plane" refers to the view of the subject from above, and "on a cross-section" refers to the view of a cross-section obtained by cutting the subject perpendicularly, viewed from the side.

[0033] Figure 3 is a perspective view showing a battery module according to one embodiment of the present invention. Figure 4 is an exploded perspective view of the battery module of Figure 3. Figure 5 is a perspective view of the battery cells included in the battery module of Figure 4.

[0034] Referring to Figures 3 to 5, a battery module 100a according to one embodiment of the present invention includes a battery cell stack 120 in which a plurality of battery cells 110, each containing electrode leads 111 and 112 protruding in directions opposite to each other, a module frame 200 housing the battery cell stack 120, a first busbar frame 310 arranged on one side of the battery cell stack 120 in the direction (x-axis direction) from which the electrode leads 111 protrude, and a second busbar frame 320 arranged on the other side of the battery cell stack 120 in the other direction (-x-axis direction) from which the electrode leads 112 protrude.

[0035] First, referring to Figure 5, it is preferable that the battery cell 110 is a pouch-type battery cell. For example, the battery cell 110 according to this embodiment has a structure in which two electrode leads 111 and 112 face each other and protrude from one end 114a and the other end 114b of the cell body 113, respectively. More specifically, the electrode leads 111 and 112 are connected to an electrode assembly (not shown) and protrude from the electrode assembly (not shown) to the outside of the battery cell 110.

[0036] On the other hand, the battery cell 110 can be manufactured by bonding both ends 114a, 114b of the cell case 114 and one side portion 114c that connects them, with the electrode assembly (not shown) housed in the cell case 114. In other words, the battery cell 110 according to this embodiment has a total of three sealing portions 114sa, 114sb, and 114sc, and the sealing portions 114sa, 114sb, and 114sc are sealed by methods such as heat fusion, and the remaining one side portion can consist of a connecting portion 115. The cell case 114 can consist of a laminate sheet containing a resin layer and a metal layer.

[0037] Furthermore, the connecting portion 115 extends along one edge of the battery cell 110, and a protruding portion 110p of the battery cell 110, called a bat-ear, may be formed at the end of the connecting portion 115. In addition, a terrace portion 116 may be formed between the electrode leads 111 and 112 and the cell body 113, while the cell case 114 is sealed with the protruding electrode leads 111 and 112 in between. In other words, the battery cell 110 includes a terrace portion 116 that extends from the cell case 114 in the direction in which the electrode leads 111 and 112 protrude.

[0038] The battery cell 110 may consist of multiple cells, and multiple battery cells 110 can be stacked so as to be electrically connected to each other to form a battery cell stack 120. Referring to Figure 4, the battery cells 110 can be stacked along the y-axis to form the battery cell stack 120. A first busbar frame 310 can be located on one side of the battery cell stack 120 in the direction in which the electrode leads 111 protrude (x-axis direction). A second busbar frame 320 can be located on the other side of the battery cell stack 120 in the direction in which the electrode leads 112 protrude (-x-axis direction). The battery cell stack 120, the first busbar frame 310, or the second busbar frame 320 can be housed in a module frame 200. The module frame 200 can protect the battery cell stack 120 and the electrical components connected thereto from external physical shocks.

[0039] The module frame 200 according to an embodiment of the present invention may have a monoframe structure. First, the monoframe may be in the form of a metal sheet material with an integrated top surface, bottom surface, and both sides, and may be manufactured by extrusion molding. However, the structure of the module frame 200 is not limited to this, and may be a structure in which a U-shaped frame and an upper plate are joined. In the case of a structure in which a U-shaped frame and an upper plate are joined, the upper plate may be formed by joining the upper side of a U-shaped frame, which is a metal sheet material with an integrated bottom surface and both sides, and may be manufactured by press molding.

[0040] A thermally conductive resin may be injected between the battery cell stack 120 and the lower surface of the module frame 200, and a thermally conductive resin layer (not shown) may be formed between the battery cell stack 120 and the lower surface of the module frame 200 through the injected thermally conductive resin.

[0041] On the other hand, the module frame 200 can be opened in the direction in which the electrode leads 111 and 112 protrude (x-axis direction, -x-axis direction), and the first end plate 410 and the second end plate 420 can be positioned on the open sides of the module frame 200, respectively. The first end plate 410 can be joined to the module frame 200 while covering the first busbar frame 310, and the second end plate 420 can be joined to the module frame 200 while covering the second busbar frame 320. In other words, the first busbar frame 310 can be positioned between the first end plate 410 and the battery cell stack 120, and the second busbar frame 320 can be positioned between the second end plate 420 and the battery cell stack 120. In addition, an insulating cover 800 (see Figure 3) for electrical insulation can be positioned between the first end plate 410 and the first busbar frame 310.

[0042] The first end plate 410 and the second end plate 420 are positioned to cover one and the other side of the battery cell stack 120, respectively. The first end plate 410 and the second end plate 420 can protect the first busbar frame 310, the second busbar frame 320 and many electrical components connected thereto from external impacts, and for this purpose must have a certain strength and may include a metal such as aluminum. The first end plate 410 and the second end plate 420 can also be joined to the corresponding edge of the module frame 200 by means of welding or other methods.

[0043] The first busbar frame 310 is positioned on one side of the battery cell stack 120, covering the battery cell stack 120 while simultaneously guiding the connection between the battery cell stack 120 and external equipment. Specifically, at least one of a busbar, a terminal busbar, and a module connector may be mounted on the first busbar frame 310. In particular, at least one of a busbar, a terminal busbar, and a module connector may be mounted on the side of the first busbar frame 310 opposite the side facing the battery cell stack 120. As an example, Figure 4 shows the first busbar frame 310 with a busbar 510 and a terminal busbar 520 mounted on it.

[0044] The battery cells 110 constituting the battery cell stack 120 may be connected in series or parallel by bus bars 510 and terminal bus bars 520, and the battery cells 110 may be electrically connected to external devices and circuits through terminal bus bars 520 exposed outside the battery module 100a. For example, the terminal bus bar 520 may be connected to an external bus bar that provides connection to other adjacent battery modules that contain the terminal bus bar 520.

[0045] The first busbar frame 310 may include an electrically insulating material. The first busbar frame 310 can prevent short circuits by restricting contact between the busbars 510 and terminal busbars 520 and the battery cell 110, except for the portions where the busbars 510 and terminal busbars 520 are joined to the electrode leads 111.

[0046] On the other hand, as mentioned above, a second busbar frame 320 can be positioned on the other side of the battery cell stack 120. Busbars and module connectors may be mounted on the second busbar frame 320. Electrode leads 112 may be joined to the busbars mounted on the second busbar frame 320. The second busbar frame 320 may include an electrically insulating material to prevent short circuits.

[0047] An opening may be formed in the first end plate 410 according to this embodiment, through which a terminal busbar 520 is exposed. The opening may be a terminal busbar opening. For example, as shown in Figures 3 and 4, a terminal busbar opening 410H may be formed in the first end plate 410 through which a terminal busbar 520 is exposed. The terminal busbar 520 further includes an upwardly protruding portion compared to the busbar 510, and such an upwardly protruding portion can be exposed to the outside of the battery module 100a through the terminal busbar opening 410H. The terminal busbar 520 exposed through the terminal busbar opening 410H can be connected to other battery modules or BDUs (Battery Disconnect Units) to form an HV (High Voltage) connection.

[0048] Figure 6 is a perspective view of the battery module from Figure 3, taken at a different angle so that the second end plate is visible from the front. Figure 7 is a cross-sectional view taken along the cutting line BB in Figure 3.

[0049] Referring to Figure 6, an opening may be formed in the second end plate 420 according to this embodiment, through which at least one of the module connectors is exposed. The opening may be a module connector opening. For example, as shown in Figure 6, a module connector opening 420H may be formed in the second end plate 420, through which a module connector 600 is exposed. This means that the module connector 600 is mounted on the second busbar frame 320 mentioned earlier.

[0050] On the other hand, although not specifically shown in the diagram, the module connector 600 can be connected to a temperature sensor, voltage measuring element, etc., located inside the battery module 100a. Such a module connector 600 is connected to an external BMS (Battery Management System) to form an LV (Low Voltage) connection, and is responsible for transmitting temperature information and voltage levels measured by the temperature sensor and voltage measuring element to the external BMS.

[0051] Referring to Figures 3, 6, and 7, a venting section 900 is formed in the upper plate of the module frame 200, and the venting section 900 may be formed more adjacent to the module connector 600 than to the terminal bus bar 520. The venting section 900 is a hole structure formed in the upper plate of the module frame 200, and the hole structure can penetrate the upper plate of the module frame 200 at an angle in the direction closer to the second bus bar frame 320. The venting section 900 may be formed so that gas is vented in the direction in which the second bus bar frame 320 or the second end plate 420 is located. This may be intended to ensure that if heat, gas, flames, or sparks are generated inside the battery module 100a, the heat, gas, flames, or sparks are discharged towards the second busbar frame 320 or second end plate 420 where a component forming an LV connection (hereinafter referred to as an LV component), such as a module connector 600, is located, rather than towards the first busbar frame 310 or first end plate 410 where a component forming an HV connection (hereinafter referred to as an HV component), such as a terminal busbar 520, is located.

[0052] According to this embodiment, as shown in Figure 7, an exhaust passage 450 can be formed between the upper part of the module frame 200 and the battery cell stack 120. Gas and heat generated between the first end plate 410 and the battery cell stack 120 can move through the exhaust passage 450 toward the second busbar frame 320 or second end plate 420 located on the opposite side of the first end plate 410. The gas and heat that have moved toward the second busbar frame 320 or second end plate 420 can be discharged from the battery module 100a through the venting section 900. Since the HV member is more prone to overheating than the LV member and is more susceptible to self-ignition or internal ignition, guiding the gas and heat generated around the first end plate 410 through the exhaust passage 450 toward the direction where the second end plate 420 is located can mitigate the internal heat propagation phenomenon.

[0053] Referring to Figures 1 and 2, in the case of conventional battery modules, high-temperature heat, gas, and flames ejected through openings in the battery module can affect adjacent battery modules. In particular, adjacent battery modules facing each other with terminal busbars 40 for HV connection may suffer damage to the terminal busbars 40, battery cells 10, and other electrical components.

[0054] Unlike conventional designs, the battery module 100a according to this embodiment has a venting section 900 formed on the upper plate of the module frame 200. By forming the venting section 900 adjacent to the module connector 600 rather than the terminal bus bar 520, it is possible to restrict the discharge of high-temperature heat, gas, and flames originating from the battery cells 110 through openings in the first end plate 410, such as the terminal bus bar opening 410H. If flames are transferred to the terminal bus bar 520, the external bus bars connecting adjacent battery modules may melt, causing an internal short circuit and additional ignition, which is highly likely to be transferred to adjacent battery modules. However, according to this embodiment, damage to adjacent battery modules and the HV connection structure can be significantly reduced.

[0055] Figure 8 is a perspective view showing a battery module according to another embodiment of the present invention.

[0056] Referring to Figure 8, the venting section 910 according to this embodiment may be formed to vent upward with respect to the battery cell stack 120. The venting section 910 is connected to the battery cell stack 120 and includes an inlet 911 formed upward on the upper surface of the module frame 200, an outlet 912 formed upward for discharging gas that has flowed in through the inlet 911, and a connecting section 913 connecting the inlet 911 and the outlet 912. The connecting section 913 may be formed perpendicular to the inflow and outflow directions of the inlet 911 and the outlet 912.

[0057] The venting section 910 minimizes damage to other battery modules positioned next to it by venting the high-temperature heat, gas, and flames inside the battery module upwards. However, since the exhaust port 912 is formed facing upwards, foreign matter in the air may enter the exhaust port 912 due to gravity. By forming the connecting section 913 perpendicular to the exhaust port 912, the phenomenon of foreign matter entering the battery module through the inlet 911 can be minimized.

[0058] Furthermore, a foreign matter blocking section (not shown) is formed on the connecting section 913 to block foreign matter from entering through the discharge port 912, thereby preventing foreign matter from entering the inlet 911 section through the connecting section 913 from the discharge port 912.

[0059] Figure 9 is a perspective view showing a battery module according to another embodiment of the present invention.

[0060] Referring to Figure 9, the venting section 920 according to this embodiment includes an inlet 921 formed on the upper surface of the module frame 200 and connected to the battery cell stack, and an outlet 922 for discharging the gas that has flowed in through the inlet 921, the outlet 922 may be formed perpendicular to the inlet 921. The venting section 920 also includes a connecting section 923 formed between the inlet 921 and the outlet 922 for guiding the gas that has flowed into the inlet 921 in the direction of the outlet 922, the upper surface of the connecting section 923 may be formed at an angle.

[0061] By forming the outlet 922 perpendicular to the inlet 921 and the upper surface of the module frame 200, it is possible to prevent foreign matter floating in the air from entering the outlet 922 due to gravity. Furthermore, by forming the upper surface of the connecting portion 923 at an angle toward the outlet 922, high-temperature heat, gas, and flames flowing into the inlet 921 can be redirected through the connecting portion 923 and naturally discharged through the outlet 922.

[0062] The following describes the experimental results for confirming the effect of the venting section 900 of this embodiment.

[0063] Table 1 compares the voltage drop time required when the battery module catches fire, depending on the presence and location of the venting section 900.

[0064] [Table 1]

[0065] Referring to Table 1, the reference is a battery module in which the venting portion 900 is not formed, CASE 1 is a configuration in which the venting portion 900 is formed adjacent to the LV member as in the embodiment of the present invention, and CASE 2 is a configuration in which the venting portion 900 is formed entirely on the upper plate of the module frame 200.

[0066] In the reference case, the initial venting and flame generation time was 156 seconds, which was slightly later than in CASE 1 and CASE 2. However, from 186 seconds onward, the voltage drop progressed rapidly, and the total voltage drop time was shown to be 119 seconds. This is because the reference battery module has a sealed structure without a venting section 900, so the oxygen supply is cut off when internal ignition occurs, delaying the initial venting and flame generation time. Furthermore, after venting and flame generation, the influx of external oxygen may have accelerated ignition, leading to a rapid voltage drop.

[0067] In CASE 2, the initial venting and flame generation time was 74 sec, indicating that venting and flame were detected earlier than in the other cases. The voltage drop began at 102 sec, and the total voltage drop time until the voltage became 0 at 213 sec was shown to be 111 sec. In CASE 2, the initial voltage drop was shown to proceed much more rapidly than in the other cases, which may be due to the rapid diffusion of heat due to the supply of sufficient oxygen through the numerous venting sections 900.

[0068] In CASE 1, the initial venting and flame generation time was 88 seconds, and the voltage drop progressed from 125 seconds to 360 seconds, with a total voltage drop time of 235 seconds. CASE 1 showed a longer total voltage drop time compared to the other cases, and the time taken for each stage of voltage drop was also shown to be more uniform and longer compared to the other cases. This may be because, compared to CASE 2, excessive oxygen does not flow in through the venting section 900, and heat propagation is delayed by properly discharging heat and gas from inside the battery module. Also, the venting section 900 in CASE 1 is located adjacent to the LV member, and by inducing the flow of gas etc. in the direction in which the LV member is located, it may be because the temperature around the HV member, which may be in a relatively high temperature state, is mitigated.

[0069] On the other hand, in the explanation regarding Table 1, the drawing numbers shown in Figure 7 were added to the venting sections, but this is merely for the sake of explanation, and the same effect as described above applies to Figures 8 and 9 or other venting sections.

[0070] A battery pack according to another embodiment of the present invention may include the aforementioned battery module, a battery module adjacent to the aforementioned battery module, and a pack case for housing the aforementioned battery module and the adjacent battery module. The first terminal busbar and the second terminal busbar included in the aforementioned battery module and the adjacent battery module may be arranged in directions facing each other. In this case, the first venting portion formed in the aforementioned battery module and the second venting portion formed in the adjacent battery module may each have a hole structure that is vented in directions away from each other.

[0071] The battery modules and battery packs according to the aforementioned embodiment can be applied to a variety of devices. Specifically, they can be applied to means of transportation such as electric bicycles, electric vehicles, and hybrids, but are not limited to these, and can be applied to a variety of devices that can use secondary batteries.

[0072] Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concepts of the present invention as defined in the claims also fall within the scope of the present invention.

[0073] Furthermore, the present invention may also preferably include the following examples. [1] A battery cell stack in which multiple battery cells are stacked, A module frame housing the aforementioned battery cell stack, A first busbar frame housed in the module frame and covering the front surface of the battery cell stack, and The module frame includes a second busbar frame that is housed within the module frame and covers the rear surface of the battery cell stack, The first busbar frame is fitted with a terminal busbar, and the second busbar frame is fitted with a module connector. A battery module having a venting portion formed in the module frame that penetrates the upper plate, wherein the venting portion is located closer to the module connector than the terminal bus bar. [2] The venting portion is a hole structure formed in the upper plate, the hole structure penetrates the upper plate diagonally in a direction close to the second busbar frame, the battery module as described in [1]. [3] The battery module according to [1] or [2], wherein the terminal busbar is connected to an external busbar that provides connectivity to other battery modules adjacent to the battery module containing the terminal busbar. [4] The battery module according to any one of [1] to [3], wherein the venting portion is formed to vent gas in the direction in which the second busbar frame is located. [5] The venting section is An inlet formed on the upper surface of the module frame and facing the battery cell stack, It includes an outlet for discharging the gas that has flowed in through the inlet, The battery module according to any one of [1] to [4], wherein the discharge port is formed perpendicular to the inlet. [6] The venting section is It includes a connecting portion formed between the inlet and the outlet, which guides the gas flowing into the inlet in the direction in which the outlet is located. The upper surface of the connecting portion is formed at an angle, as described in [5], the battery module. [7] The venting portion is formed to be vented upward with respect to the battery cell stack, as described in any one of [1] to [6]. [8] The venting section is An inlet is connected to the aforementioned battery cell stack and is formed upward on the upper surface of the module frame, An outlet formed in the upward direction for discharging the gas that has flowed in through the inlet, and Includes a connecting portion that connects the inlet and the outlet, The battery module according to [7], wherein the connecting portion is formed in a direction perpendicular to the inflow and outflow directions of the inlet and outlet. [9] A battery module according to any one of [1] to [8], wherein a discharge passage is formed between the upper part of the module frame and the battery cell stack. A battery pack containing a battery module as described in any one of the items

[10] [1] to [9]. [Explanation of symbols]

[0074] 200: Module Frame 310, 320: Busbar frame 410, 420: End plate 520: Terminal Bus Bar 600: Module connector 900, 910, 920: Venting section

Claims

1. A battery module, A battery cell stack, in which multiple battery cells are stacked, A module frame housing the aforementioned battery cell stack, A terminal busbar exposed to the outside of the battery module and located on one side of the battery module, A module connector exposed to the outside of the battery module and located on the other side of the battery module, and The terminal busbar includes an external busbar that connects to the terminal busbar of another battery module adjacent to the battery module. The module frame has a venting portion that penetrates one surface of the module frame. The venting portion is located closer to the module connector than the terminal busbar in the battery module.

2. A first end plate is joined to one open side of the module frame and covers one side of the battery cell stack, and The module frame is joined to the other open side and further comprises a second end plate that covers the other side of the battery cell stack, The first end plate has a terminal busbar opening through which the terminal busbar is exposed to the outside. The battery module according to claim 1, wherein the second end plate has a module connector opening through which the module connector is exposed to the outside.

3. The battery module according to claim 2, which is used in a state in which the first end plates are arranged facing each other relative to other battery modules.

4. The aforementioned venting section is a hole structure formed in the upper part of the module frame, The battery module according to claim 2, wherein the hole structure penetrates the upper part of the module frame diagonally in a direction closer to the second end plate.

5. The battery module according to any one of claims 2 to 4, wherein the venting portion is formed to vent gas in the direction in which the second end plate is located.

6. The aforementioned venting section is An inlet formed on the upper surface of the module frame and facing the battery cell stack, It includes an outlet for discharging the gas that has flowed in through the inlet, The battery module according to claim 1, wherein the discharge port is formed in a direction perpendicular to the inlet.

7. The aforementioned venting section is It includes a connecting portion formed between the inlet and the outlet, which guides the gas flowing into the inlet in the direction in which the outlet is located. The upper surface of the connecting portion is formed at an angle, as described in claim 6 of the battery module.

8. The battery module according to any one of claims 1 to 7, wherein the venting portion is formed to vent upward with respect to the battery cell stack.

9. The battery module according to any one of claims 1 to 8, which is used in a state in which the terminal busbars are arranged adjacent to each other so as to face each other with respect to other battery modules.

10. The aforementioned venting section is An inlet is connected to the aforementioned battery cell stack and is formed upward on the upper surface of the module frame, An outlet formed in the upward direction for discharging the gas that has flowed in through the inlet, and Includes a connecting portion that connects the inlet and the outlet, The battery module according to claim 1, wherein the connecting portion is formed in a direction perpendicular to the inflow and discharge directions of the inlet and outlet.

11. A discharge passage is formed between one surface of the module frame and the battery cell stack. The battery module according to any one of claims 1 to 10, wherein the gas or heat generated within the battery module is guided to move along the discharge passage to the venting section located closer to the module connector.

12. The battery module according to claim 11, wherein the discharge passage is formed between the upper part of the module frame and the battery cell stack.

13. A first busbar frame housed in the module frame and covering one side of the battery cell stack, and The module frame further includes a second busbar frame that is housed within the module frame and covers the other side of the battery cell stack, The battery module according to any one of claims 2 to 12, wherein a terminal busbar is mounted on the first busbar frame and a module connector is mounted on the second busbar frame.

14. The first end plate covers the first busbar frame, The battery module according to claim 13, referencing claim 2, wherein the second end plate covers the second busbar frame.

15. A battery pack comprising a battery module according to any one of claims 1 to 14.

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