Battery pack

Abstract

Provided is a battery pack including: a battery cell having a cell tab extending outward; a protection circuit module electrically connected to the cell tab to prevent overcharge and overdischarge of the battery cell; and a module case accommodating the protection circuit module and mounted on the battery cell, wherein the module case includes a first region, a second region located on the first region, and a third region extending from the first region through the second region, and the protection circuit module is accommodated in a cavity provided between the first region and the second region.

Description

[0001] This application is based on and claims priority to Korean Patent Application No. 10-2021-0099794, filed on July 29, 2021, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0002] The embodiment relates to a battery pack. Background Technology

[0003] Unlike non-rechargeable primary batteries, secondary batteries can be charged and discharged. Low-capacity secondary batteries can be used in portable small electronic devices such as smartphones, feature phones, laptops, digital cameras, or camcorders, while high-capacity secondary batteries are widely used as power sources for electric motor drives (such as those in hybrid or electric vehicles) and for energy storage. A secondary battery may include electrode assemblies and external materials for housing the electrode assemblies, which include a positive electrode plate, a separator, and a negative electrode plate. The external materials can be characterized by their circular, prismatic, or pouch-like shapes.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the disclosed background technology, and therefore may include information that does not constitute prior art. Summary of the Invention

[0005] The embodiment relates to a battery pack, the battery pack comprising: a battery cell having an outwardly extending cell terminal piece; a protection circuit module electrically connected to the cell terminal piece to prevent overcharging and over-discharging of the battery cell; and a module housing housing the protection circuit module and mounted on the battery cell, wherein the module housing includes a first region, a second region located on the first region, and a third region extending from the first region through the second region, and the protection circuit module is housed in a cavity disposed between the first region and the second region.

[0006] A battery cell may include an electrode assembly to which a cell terminal is connected and an external material for housing the electrode assembly. The external material includes a first housing portion, a second housing portion located on the first housing portion, a third housing portion located in front of the second housing portion, and a fourth housing portion extending from the third housing portion and the first housing portion and through which the cell terminal is passed. A module housing may be mounted on the fourth housing portion and the third housing portion.

[0007] The first region of the module housing may be located on the fourth housing portion of the outer material, and the third region of the module housing may be located on the third housing portion of the outer material.

[0008] The battery pack may also include: a first double-sided tape disposed between a first region of the module housing and a fourth housing portion of the outer material; and a second double-sided tape disposed between a third region of the module housing and a third housing portion of the outer material.

[0009] The height of the third region of the module housing can be equal to or less than the height of the third housing portion of the external material.

[0010] The height of the third region of the module housing can be greater than the height of the second region of the module housing.

[0011] The module housing may also include a bonding protrusion that projects from the second region toward the first region to bond the protection circuit module, and the protection circuit module may include a recess into which the bonding protrusion bonds.

[0012] The protection circuit module may include a connector extending in the longitudinal direction, and the module housing may include an opening through which the connector passes.

[0013] A first region of the module housing may include an opening configured to receive a cell terminal piece of a battery cell.

[0014] The battery pack may include a protective strip that extends to block the cavity of the module housing while being attached to the bottom surface of the fourth housing portion, and the protective strip adheres to a second region of the module housing. Attached Figure Description

[0015] Features will become apparent to those skilled in the art from the detailed description of exemplary embodiments with reference to the accompanying drawings.

[0016] Figure 1A and Figure 1B These are a plan view and an exploded perspective view of a battery pack according to an example embodiment.

[0017] Figure 2A , Figure 2B and Figure 2C This shows a partial enlarged perspective view, a front view, and a partial sectional view of a battery pack according to an example embodiment.

[0018] Figure 3 This is a perspective view showing an example module housing in a battery pack according to an example embodiment.

[0019] Figure 4 This is a perspective view showing the connection relationship between an example module housing and an example protection circuit module in a battery pack according to an example embodiment.

[0020] Figure 5 This is an enlarged view showing an example combined protrusion disposed in an example module housing in a battery pack according to an example embodiment.

[0021] Figure 6 This is a perspective view showing the connection relationship between an example module housing and an example protection circuit module in a battery pack according to an example embodiment.

[0022] Figure 7 This is a perspective view showing an example module housing with an attachment surface in a battery pack according to an example embodiment. Detailed Implementation

[0023] Example embodiments will now be described more fully below with reference to the accompanying drawings; however, example embodiments may be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the example implementation methods to those skilled in the art. In the drawings, the dimensions of layers and regions are exaggerated for clarity of illustration. The same reference numerals always denote the same elements.

[0024] As used herein, the term “and / or” includes any and all combinations of one or more of the relevant listed items. Furthermore, it will be understood that when element A is referred to as being “connected to” element B, element A may be directly connected to element B, or an intermediary element C may exist between element A and element B such that element A and element B are indirectly connected to each other.

[0025] As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. It will also be understood that when the terms “comprising” or “including” and / or variations thereof are used in this specification, it indicates the presence of the stated features, quantities, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, quantities, steps, operations, elements, components, and / or groups thereof.

[0026] It will be understood that although the terms first, second, etc., may be used herein to describe various components, elements, regions, layers, and / or portions, these components, elements, regions, layers, and / or portions should not be limited by these terms. These terms are used only to distinguish one component, element, region, layer, and / or portion from another component, element, region, layer, and / or portion. Thus, for example, without departing from the teachings of this exemplary embodiment, the first component, first element, first region, first layer, and / or first portion discussed below may be referred to as a second component, second element, second region, second layer, and / or second portion.

[0027] For ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” and “above” are used herein to describe the relationship between one element or feature and another (or more) elements or features as shown in the figures. It will be understood that spatial relative terms are intended to encompass different orientations of the device in use or operation other than those depicted in the figures. For example, if the elements or features in the figures are flipped, an element described as “below” or “under” other elements or features would subsequently be positioned “above” or “above” said other elements or features. Thus, the example term “below” can encompass both above and below orientations.

[0028] Figure 1A and Figure 1B These are a plan view and an exploded perspective view showing a battery pack 100 according to an example embodiment.

[0029] exist Figure 1A and Figure 1B In the example shown, the battery pack 100 of this example embodiment may include a battery cell 110, a protection circuit module 120, and a module housing 130. The battery pack 100 may include double-sided adhesive tape 140 and / or protective tape 150. The battery pack 100 may include covers 161 and 162 for covering and protecting the side peripheries of the battery cell 110, and a cover 163 for covering and protecting the rear periphery of the battery cell 110. The battery cell 110 may include an electrode assembly 110A (see...). Figure 2C ), positive electrode terminal 114, negative electrode terminal 115, and external material 116. The positive electrode terminal 114 can be connected to the positive electrode plate 111 (see...) of the electrode assembly 110A. Figure 2C While extending to the outside of the outer material 116, the negative electrode unit terminal piece 115 can be connected to the negative electrode plate ( Figure 2C The outer material 116 extends to the exterior of the outer housing portion 112. The outer housing portion 116 may include a first housing portion 116a (see [reference needed]). Figure 2CThe battery cell 110A comprises a second housing portion 116b, a third housing portion 116c, a fourth housing portion 118, a fifth housing portion 117, and peripheral sealing portions 119a and 119b. Positive electrode terminal piece 114 and negative electrode terminal piece 115 may extend through the fourth housing portion 118 to the outside of the battery cell 110. The fourth housing portion 118 may include, or be referred to as, a platform. An external material 116 may protect the electrode assembly 110A from external environmental influences, and for this purpose, the fourth housing portion 118 may also be sealed in addition to the peripheral sealing portions 119a and 119b. The fourth housing portion 118 may also include a region substantially sealed to the first housing portion 116a. The fourth housing portion 118 may refer to the region extending forward from the third housing portion 116c and then sealed, and the region extending forward from the first housing portion 116a and then sealed.

[0030] The protection circuit module 120 may include a printed circuit board 121, the printed circuit board 121 having a recess 121a, a positive electrode single-unit terminal piece 114 inserted into and soldered thereto, and a positive electrode soldering terminal piece (…). Figure 2B 122) and the negative electrode single-cell terminal 115 are inserted and soldered to its negative electrode welding terminal ( Figure 2B (123). The protection circuit module 120 may include a charge / discharge protection device (e.g., an integrated circuit, a switching element, a resistive element, a sensor, etc.) 124 and a connector 125. The protection circuit module 120 can monitor the charge / discharge voltage, charge / discharge current, and / or temperature of the battery cell 110 to protect the battery cell 110 from overcharging and over-discharging. The connector 125 can be connected to an external electronic device to charge or discharge the battery cell 110.

[0031] The module housing 130 may include a first region 131, a second region 132, a third region 134, and a fourth region 133. A pair of spaced-apart openings 131a and 131b may be provided in the first region 131. Spaced-apart test holes 132a and / or connecting protrusions (…) Figure 5 The first region 131 (138) can be located in the second region 132. The cavity 135 can be located between the first region 131 and the second region 132. The opening 137 can be located at one end of each of the first region 131 and the second region 132. The protection circuit module 120 can be accommodated in the cavity 135 of the module housing 130.

[0032] Double-sided tape 140 can be placed between module housing 130 and battery cell 110. Double-sided tape 140 can be configured to be approximately "L" shaped and can include a first double-sided tape 141 and a second double-sided tape 142.

[0033] The protective strip 150 can wrap around the battery cell 110 and the module housing 130, thereby insulating the protection circuit module 120 disposed in the module housing 130 from the external environment and protecting the battery cell 110 from external impacts.

[0034] Covers 161 and 162 can respectively cover the outer sealing portions 119a and 119b of the battery cell 110, and cover 163 can cover the fifth housing portion 117 of the battery cell 110, thereby protecting the battery cell 110 from external impacts.

[0035] Figure 2A , Figure 2B and Figure 2C These are a partial enlarged perspective view, a front view, and a partial sectional view of the battery pack 100 according to an example embodiment.

[0036] Reference Figure 2A , Figure 2B and Figure 2C The battery pack 100 in this example embodiment may include a protection circuit module 120 and a module housing 130 mounted to a battery cell 110. The module housing 130 housing the protection circuit module 120 may be disposed on the fourth housing portion 118 of the battery cell 110.

[0037] The battery cell 110 may include an electrode assembly 110A, with cell terminals 114 and 115 connected to the electrode assembly 110A. The electrode assembly 110A may include a positive electrode plate 111, a negative electrode plate 112, and a separator 113 located between the positive and negative electrode plates 111 and 112. The electrode assembly 110A may be surrounded by an external material 116. A liquid electrolyte, gel electrolyte, or solid electrolyte may be contained within the external material 116. The external material 116 may include, or be referred to as, a laminated external material, in which insulating layers are respectively disposed on the upper and lower surfaces surrounding a thin metal film. The external material 116 may also be referred to as a pouch. The external material 116 may include a first housing portion 116a located below the electrode assembly 110A, a second housing portion 116b located above the electrode assembly 110A as the upper part of the first housing portion 116a, a third housing portion 116c located in front of the second housing portion 116b, and a fourth housing portion 118 extending from the third housing portion 116c and the first housing portion 116a and through which the positive electrode terminal piece 114 and the negative electrode terminal piece 115 pass. The plane of the fourth housing portion 118 may be substantially parallel to the plane of the first housing portion 116a and / or the plane of the second housing portion 116b, and may be substantially perpendicular to the plane of the third housing portion 116c. A bent portion 116d may also be provided between the second housing portion 116b and the third housing portion 116c. Peripheral sealing portions 119a and 119b may extend and fold to both sides of the fourth housing portion 118.

[0038] Module housing 130 may be mounted on the fourth housing portion 118 and the third housing portion 116c of the outer material 116. Module housing 130 may be provided with or formed of an insulating material, including polycarbonate (PC), polyimide (PI), polypropylene (PP), or polyethylene (PE). A first region 131 of module housing 130 may be located on the fourth housing portion 118 of the outer material 116. A third region 134 of module housing 130 may be located on the third housing portion 116c of the outer material 116. Module housing 130 may include, or be referred to as, a module cover, a module shell, or module external material.

[0039] The first double-sided tape 141 can be placed between the first region 131 of the module housing 130 and the fourth housing portion 118 of the outer material 116. The second double-sided tape 142 can be placed between the third region 134 of the module housing 130 and the third housing portion 116c of the outer material 116. The double-sided tape 140 composed of the first double-sided tape 141 and the second double-sided tape 142 can be bent into an approximately "L" shape.

[0040] The module housing 130 may include a first region 131, a second region 132 located above the first region 131, and a third region 134 extending upward from the first region 131 and passing through the second region 132. The protection circuit module 120 may be accommodated in a cavity 135 disposed between the first region 131 and the second region 132. The cavity 135 may have widths in both the horizontal and vertical directions to adequately accommodate the protection circuit module 120, which includes the printed circuit board 121 and the charge / discharge protection device 124.

[0041] The first region 131 of the module housing 130 can accommodate the positive electrode single-cell connector 114 and the positive electrode welding connector 122 connected to the positive electrode single-cell connector 114, and may also include openings 131a and 131b, in which the negative electrode single-cell connector 115 and the negative electrode welding connector 123 connected to the negative electrode single-cell connector 115 are respectively accommodated. The height of the third region 134 of the module housing 130 may be less than or equal to the height of the third housing portion 116c of the outer material 116. The height of the third region 134 of the module housing 130 may be greater than the height of the second region 132 of the module housing 130. The height of the third housing portion 116c may refer to the height extending up to the uppermost end of the curved portion 116d connected to the second housing portion 116b.

[0042] A coupling protrusion 138 of the module housing 130 can protrude from the second region 132 of the module housing 130 toward the protection circuit module 120 so as to engage with the protection circuit module 120 housed in the cavity 135 of the module housing 130. A recess 121a of the protection circuit module 120 can be provided in the region corresponding to the coupling protrusion 138. Therefore, the recess 121a of the protection circuit module 120 can engage with the coupling protrusion 138 of the module housing 130.

[0043] The connector 125 of the protection circuit module 120 may extend in the longitudinal direction of the printed circuit board 121. The connector 125 may be electrically connected to an electronic device and may be bent into various shapes. The module housing 130 may include an opening 137 through which the connector 125 passes.

[0044] The lower region of the protective strip 150 can adhere to the fourth housing portion 118 of the outer material 116, the front region of the protective strip 150 can block the cavity 135 of the module housing 130, and the upper region of the protective strip 150 can adhere to the second region 132 of the module housing 130. Therefore, the protective strip 150 ensures the insulation of the protection circuit module 120 and also ensures the insulation of the individual terminals 114 and 115.

[0045] The battery pack 100 described above can distribute drop impacts (e.g., impacts caused by a drop) through the operation of the module housing 130, etc., which covers the protection circuit module 120. Furthermore, by thinning the module housing 130, the battery pack 100 can have a reduced thickness. Additionally, the battery pack 100 can improve heat dissipation performance by allowing a third region 134 of the module housing 130 to dissipate heat from the individual battery cells 110 to the outside.

[0046] Figure 3 This is a perspective view showing an example of a module housing 130 in a battery pack 100 according to an exemplary embodiment. Figure 4 This is a perspective view showing the connection relationship between the example module housing 130 and the example protection circuit module 120 in the example battery pack 100 of this example embodiment.

[0047] exist Figure 3 and Figure 4 In the example shown, the engagement protrusion 138 can protrude from the second region 132 of the module housing 130 toward the first region 131. The engagement protrusion 138 can also protrude toward openings 131a and 131b.

[0048] The positive electrode single-cell connector 114 and the positive electrode welding connector 122, as well as the negative electrode single-cell connector 115 and the negative electrode welding connector 123, can be exposed through a pair of openings 131a and 131b.

[0049] Furthermore, to prevent interference with the peripheral sealing portions 119a and 119b of the external material 116, steps 139 may be further provided on both sides of the first region 131 of the module housing 130. Additionally, a closed fourth region 133 may be provided on one side of each of the first region 131 and the second region 132 of the module housing 130. An opening 137 may be provided on the other side of the module housing 130 through which the connector 125 is led out.

[0050] Figure 5 This is an enlarged view showing an example bonding protrusion 138 in an example module housing 130 disposed in an example battery pack 100 of this example embodiment.

[0051] exist Figure 5In the example shown, the engagement protrusion 138 can protrude from the second region 132 of the module housing 130 toward the first region 131 or openings 131a and 131b. A recess 121a can be provided in the printed circuit board 121 of the protection circuit module 120 corresponding to the engagement protrusion 138. Therefore, the engagement protrusion 138 of the module housing 130 can engage with the recess 121a of the printed circuit board 121 of the protection circuit module 120, making it difficult to separate the printed circuit board 121 and the module housing 130 once the printed circuit board 121 is engaged with the module housing 130.

[0052] Figure 6 This is a perspective view showing the connection relationship between the example module housing 130 and the example protection circuit module 120 in the example battery pack 100 of this example embodiment.

[0053] exist Figure 6 In the example shown, step 139 may be provided on one side of module housing 130 to prevent module housing 130 from interfering with the peripheral sealing portions 119a and 119b of external material 116, and opening 137 may be provided at the other end of module housing 130 to allow connector 125 (connected to protection circuit module 120) to be led out.

[0054] Figure 7 This is a perspective view showing an example module housing 130 with an attachment surface for a protective strip 150 in an example battery pack 100 of this example embodiment.

[0055] exist Figure 7 The example shown, and further refer to Figure 2C The protective tape 150 can adhere to the fourth housing portion 118 while covering the cavity 135 of the module housing 130, and can also cover the second region 132 of the module housing 130. Therefore, the protective tape 150 can cover the protection circuit module 120 and the individual terminal pieces 114 and 115, thereby ensuring insulation between the protection circuit module 120 and the individual terminal pieces 114 and 115. Figure 7 In order to facilitate understanding, the attachment surface of the protective tape 150 is shaded.

[0056] By summarizing and reviewing, pouch-type secondary batteries may include stacked pouches that are easily deformable into various shapes and have a small weight, and may include a protection circuit module mounted on one side of the stacked pouch to control the charging and discharging of the battery.

[0057] As described above, the battery pack according to the example embodiment may include a module housing that covers the protective circuit module to help distribute drop impacts.

[0058] When the battery pack is dropped, the battery pack, including the module housing covering the protective circuit module, can reduce the impact by about 30% to about 40%.

[0059] Furthermore, the battery pack according to the example embodiment can have a reduced thickness by manufacturing a thin module housing.

[0060] According to an example embodiment, in the battery pack, the module housing that houses the protection circuit module can be placed on the fourth housing portion, so the thickness of the battery pack can remain unchanged (e.g., the thickness of the battery pack can be substantially equal to the thickness of the individual battery cells), thereby reducing the thickness of the terminal device to which the battery pack is attached.

[0061] Furthermore, the battery pack according to the example embodiment may include heat dissipation elements in the module housing to improve heat dissipation performance. In the example embodiment, heat generated from the individual battery cells can be quickly dissipated to the outside through the module housing; for example, a third region of the module housing may be used as heat dissipation fins.

[0062] In the battery pack according to the example embodiment, the bonding strength between the module housing and the individual battery cells can be improved. The first and second double-sided adhesive tapes may include a ceramic adhesive layer with high thermal conductivity, which allows heat from the individual battery cells to be rapidly transferred to the module housing, thereby improving heat dissipation performance.

[0063] In the battery pack according to the example embodiment, the height of the third region of the module housing may not be greater than the height of the third housing portion of the outer material, so the thickness of the battery pack may not be increased.

[0064] In the battery pack according to the example embodiment, the protection circuit module integrated into the module housing will not separate from the outside of the module housing due to external impact.

[0065] In the battery pack according to the example embodiment, the connector can extend in the lateral direction instead of in front of the protection circuit module, so as not to increase the length of the battery pack.

[0066] In the battery pack according to the example embodiment, the external material may include peripheral sealing portions for sealing the first housing portion and the second housing portion around their peripheries, and a first region of the module housing may include steps for preventing interference with the peripheral sealing portions. The steps may be provided in each overlapping region of the peripheral sealing portions of the module housing, which may facilitate the installation of the module housing and / or prevent an increase in installation thickness.

[0067] In the battery pack according to the example embodiment, with the protection circuit module attached to the module housing, the individual terminal pieces of the battery cells can be directly welded to the welding terminal pieces of the protection circuit module (e.g., by laser welding or ultrasonic welding), thereby simplifying the manufacturing process of the battery pack.

[0068] In the battery pack according to the example embodiment, the protection circuit module in the module housing can be completed (or terminated with a protection strip), which can help ensure insulation from the external environment and improve the bonding force between the module housing and the battery cell.

[0069] Example embodiments have been disclosed herein, and although specific terminology has been used, it is used and interpreted in a general and descriptive sense only, and not for limiting purposes. In some instances, as will be apparent to those skilled in the art, features, characteristics, and / or elements described in connection with specific embodiments may be used alone or in combination with features, characteristics, and / or elements described in connection with other embodiments, unless specifically indicated otherwise, from the time of filing of this application. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of the invention as set forth in the appended claims.

[0070] Explanation of reference numerals in the attached figures

[0071] 100: Battery pack

[0072] 110: Battery cell

[0073] 110A: Electrode assembly

[0074] 111: Positive plate

[0075] 112: Negative electrode plate

[0076] 113: Diaphragm

[0077] 114: Positive electrode cell connector

[0078] 115: Negative electrode single-cell connector

[0079] 116: External materials

[0080] 116a: First shell section

[0081] 116b: Second shell section

[0082] 116c: Third shell section

[0083] 117: Fifth Shell Section

[0084] 118: Fourth shell section

[0085] 119a, 119b: External sealing parts

[0086] 120: Protection Circuit Module

[0087] 121: Printed Circuit Board

[0088] 121a: concave part

[0089] 122: Positive electrode welding connector

[0090] 123: Negative electrode welding connector

[0091] 124: Charging / Discharging Protection Device

[0092] 125: Connector

[0093] 130: Module housing

[0094] 131: Area 1

[0095] 131a: Steps

[0096] 131a, 131b: Opening

[0097] 132: Second Region

[0098] 132a: Test hole

[0099] 133: Fourth Region

[0100] 134: Third Region

[0101] 135: cavity

[0102] 137: Opening

[0103] 138: Combined protrusion

[0104] 141, 142: First double-sided tape, second double-sided tape

[0105] 150: Protective belt

[0106] 161, 162: Cover

[0107] 163: Cover

Claims

1. A battery pack, the battery pack comprising: A battery cell includes an electrode assembly and an external material housing the electrode assembly, and has outwardly extending cell terminals; The protection circuit module is electrically connected to the individual terminal block; The module housing houses the protection circuit module and is mounted on the battery cell. The module housing includes a first region, a second region located on the first region, and a third region, and the protection circuit module is housed in a cavity disposed between the first region and the second region. The third region extends from the first region through the second region to the outside of the cavity, thereby serving as a heat dissipation fin to dissipate heat generated from the battery cell to the outside. The battery pack further includes double-sided adhesive tape disposed between the first region and the third region of the module housing and the external material, the double-sided adhesive tape comprising a ceramic adhesive layer.

2. The battery pack according to claim 1, wherein, The individual terminal piece is connected to the electrode assembly. The external material includes a first housing portion, a second housing portion located on the first housing portion, a third housing portion located in front of the second housing portion, and a fourth housing portion extending from the third housing portion and the first housing portion and through which the individual terminal piece passes. The module housing is mounted on the fourth housing portion and the third housing portion.

3. The battery pack according to claim 2, wherein, The first region of the module housing is located on the fourth housing portion of the external material, and the third region of the module housing is located on the third housing portion of the external material.

4. The battery pack according to claim 3, wherein, The double-sided adhesive tape includes: A first double-sided adhesive tape is placed between the first region of the module housing and the fourth housing portion of the external material; and A second double-sided tape is placed between the third region of the module housing and the third housing portion of the external material.

5. The battery pack according to claim 2, wherein, The height of the third region of the module housing is equal to or less than the height of the third housing portion of the external material.

6. The battery pack according to claim 2, wherein, The height of the third region of the module housing is greater than the height of the second region of the module housing.

7. The battery pack according to claim 1, wherein, The module housing also includes a bonding protrusion projecting from the second region toward the first region to engage the protection circuit module, and The protection circuit module includes a recess, and the connecting protrusion is attached to the recess.

8. The battery pack according to claim 1, wherein, The protection circuit module includes a connector extending in the longitudinal direction of the protection circuit module, and The module housing also includes an opening through which the connector passes.

9. The battery pack according to claim 2, wherein, The external material also includes a peripheral sealing portion for sealing the first housing portion and the second housing portion on their peripheries, and The first region of the module housing includes a step to prevent interference with the peripheral sealing portion.

10. The battery pack according to claim 1, wherein, The first region of the module housing includes an opening configured to receive the cell terminal piece of the battery cell.

11. The battery pack of claim 2, further comprising a protective strip that extends while being attached to the bottom surface of the fourth housing portion and the second region of the module housing, and blocks the cavity of the module housing.

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