Battery module ensuring airtightness for HV terminal and battery pack including the battery module

Abstract

The present invention relates to a battery module and a battery pack, and provides sealing, particularly airtightness, to a high voltage (HV) terminal, thereby preventing moisture from penetrating from the outside and improving durability of the battery pack.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2020-0005730, filed on January 16, 2020, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a battery module having a function of providing airtightness to a high voltage (HV) terminal and a battery pack including the battery module. Background Art

[0003] Generally, a secondary battery is a battery that can be repeatedly used by allowing charging and discharging. The secondary battery consists of a battery module and is used in portable compact electronic devices such as mobile phones, laptops, computers, cameras, camcorders, etc., or the secondary battery consists of a battery pack including a plurality of single modules and is used as a power source for driving a motor of a high-power hybrid electric vehicle (HEV), an electric vehicle (EV), etc.

[0004] In particular, electric vehicles use high-output electric energy, so each vehicle requires multiple battery modules. In order to construct a battery pack including multiple single-cell modules, electrical connection between battery modules is required. HV terminals as connection terminals are formed in each battery module, and electrical connection between battery modules is performed by connection between HV terminals formed on one outer side of the battery module.

[0005] Figure 1 is a partial perspective view showing a portion where an HV terminal of a conventional battery module is mounted. Figure 1 , the battery module 10 is electrically connected to another battery module via the HV terminal 12. The module bus bar is used for electrical connection between the battery modules 10. In the conventional battery module 10, the HV terminal 12 is formed on one side of the battery module housing 11 and has a structure exposed to the outside. Specifically, a hole for fastening a bolt is formed in the center of the HV terminal 12, and external moisture or the like may penetrate into the battery module 10 through the hole. As a result, the moisture that penetrates into the battery module 10 through the HV terminal 12 deteriorates the performance of the battery module 10. Summary of the invention

[0006] Technical issues

[0007] The present invention provides a battery module having a structure for providing airtightness to an HV (high voltage) terminal and a battery pack including the battery module.

[0008] Technical Solutions

[0009] The present invention provides a battery module having airtightness to a high voltage (HV) terminal. In one example, the battery module includes: a battery module housing configured to accommodate a plurality of battery cells and having an opening at one side, the opening having a thread; a high voltage (HV) terminal having a structure electrically connected to electrode leads from the plurality of battery cells; and a sealing portion configured to be inserted and fastened to the opening of the battery module housing, wherein the sealing portion allows the high voltage terminal to be electrically connected to the outside, one end of the sealing portion contacts the high voltage terminal, and the other end of the sealing portion is exposed to the outside of the battery module housing, thereby contacting a module bus bar.

[0010] In a specific example, the sealing portion has a structure in which a diameter of an end portion thereof exposed to the outside is larger than a diameter of the opening.

[0011] In a specific example, an insertion groove is formed in the high voltage terminal, and one end of the sealing portion is inserted into the insertion groove.

[0012] Herein, the sealing portion has a structure in which a diameter of a portion inserted into the insertion groove of the high voltage terminal is smaller than a diameter of the opening.

[0013] In one example, the module bus bar is fastened between the sealing portion and the bolts for fastening the module bus bar, and fastening between the battery module housing and the sealing portion and fastening between the sealing portion and the bolts for fastening the module bus bar are performed by threaded fastening schemes, respectively.

[0014] Specifically, a groove for fastening the bolt is formed at an end portion of the sealing portion exposed to the outside, and the bolt for fastening the module bus bar is inserted into the groove.

[0015] In a specific example, a thread for inserting a bolt is formed at the groove formed at the end portion of the sealing portion exposed to the outside.

[0016] A module bus bar is fastened between the sealing portion and the module bus bar fastening bolt.

[0017] In a specific example, a fastening direction between the battery module housing and the sealing portion is consistent with a fastening direction between the sealing portion and a bolt for fastening the module bus bar.

[0018] In another example, 3 to 5 recessed portions arranged at regular intervals are formed at the end portion of the sealing portion exposed to the outside.

[0019] In one example, the battery module further includes an O-ring located at a portion of the battery module housing contacting the sealing portion.

[0020] In a specific example, the sealing portion is made of a conductive metal material.

[0021] In one example, the high voltage terminal is located in the battery module housing and is not exposed to the outside.

[0022] In addition, the present invention provides a battery pack including the above-mentioned battery module. In one example, the battery pack according to the present invention includes: a battery pack housing; and a plurality of battery modules, the plurality of battery modules being accommodated in the battery pack housing, wherein the battery module is the above-mentioned battery module.

[0023] In one example, the present invention provides an energy storage device including the above-mentioned battery pack.

[0024] In yet another example, the present invention provides a vehicle including the above-mentioned battery pack.

[0025] Beneficial effects

[0026] According to the battery module and the battery pack according to the present invention, external moisture penetration can be blocked by providing airtightness to a high voltage (HV) terminal, and durability of the battery pack can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a partial perspective view showing a portion where an HV terminal of a conventional battery module is mounted.

[0028] Figure 2 is a partial perspective view showing a sealing portion covering an HV terminal in a battery module according to one embodiment.

[0029] Figure 3 FIG. 1 is a partial cross-sectional view of a region where a sealing portion covering the HV terminal is formed in a battery module according to an embodiment of the present invention.

[0030] Figure 4 is a partial perspective view showing a process of fastening a sealing portion into a battery module case in a battery module according to one embodiment of the present invention.

[0031] Figure 5 is a partial cross-sectional view showing a state in which a module bus bar is fastened to a sealing portion covering the HV terminal in a battery module according to one embodiment of the present invention. DETAILED DESCRIPTION

[0032] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. The terms and words used in this specification and claims should not be interpreted as limited to common terms or dictionary terms, and the inventors may appropriately define the concepts of the terms in order to best describe their inventions. The terms and words should be interpreted as meanings and concepts consistent with the technical ideas of the present invention.

[0033] The present invention provides a battery module. In one example, the battery module includes: a battery module housing configured to accommodate a plurality of battery cells and having an opening at one side, the opening having a thread; a high voltage (HV) terminal having a structure electrically connected to electrode leads from a plurality of battery cells; and a sealing portion configured to be inserted and fastened to the opening of the battery module housing, wherein the sealing portion allows the HV terminal to be electrically connected to the outside, one end of the sealing portion contacts the HV terminal, and the other end of the sealing portion is exposed to the outside of the battery module housing, thereby contacting a module bus bar.

[0034] The HV terminal is a single-cell bus bar that electrically connects each battery cell by welding the electrode leads from the battery cell. Conventional battery modules have a structure that exposes the HV terminal to the outside of the battery module, which causes external moisture to penetrate into the battery module through the HV terminal. This leads to durability issues such as corrosion of the internal battery cells and may cause performance degradation and fire of the battery module.

[0035] In the present invention, the HV terminal is accommodated inside the battery module housing, and a sealing portion is provided for electrically connecting the HV terminal to the outside while blocking the HV terminal from being exposed to the outside. Thus, the battery module according to the present invention can block the external moisture penetration path caused by forming the HV terminal and maintain the performance of the battery module for a long time.

[0036] Specifically, the sealing portion has a structure in which the diameter of the end exposed to the outside is larger than the diameter of the opening. Thus, the cross-section of the sealing portion has a structure formed as a "convex" step. By setting the diameter of the end exposed to the outside of the sealing portion to be larger than the diameter of the portion in contact with the opening, the sealing portion can be prevented from being deeply inserted into the module due to external force. In addition, the contact area between the module housing and the sealing portion can be increased to further improve the airtightness of the battery module.

[0037] In addition, by forming a step to allow a cross section of the opening formed in the battery module case to correspond to a cross-sectional shape of the sealing portion, the sealing portion can be stably coupled with the battery module case.

[0038] In addition, an insertion groove can be formed in the HV terminal, and one end of the sealing portion can be inserted into the insertion groove. At this time, the diameter of the portion of the sealing portion to be inserted into the insertion groove can be set to be smaller than the diameter of the opening. That is, due to the reduction in diameter of the end of the sealing portion exposed to the outside, the portion in contact with the opening, and the portion inserted into the insertion groove, two steps are formed at the sealing portion. This prevents the sealing portion from moving by fixing the end contacting the HV terminal in the sealing portion.

[0039] On the other hand, the HV terminal of the battery module will be connected to the module busbar for electrical connection between the battery modules. The module busbar is fastened between the sealing portion and the bolts to be used to fasten the module busbar. Further, the fastening between the opening of the battery module housing and the sealing portion and the fastening between the sealing portion and the bolts for fastening the module busbar are performed by threaded fastening schemes, respectively. In the present invention, the electrical connection between the battery modules is performed by fastening the module busbar between the sealing portion and the bolts for fastening the busbar. The battery module according to the present invention has the following structure: wherein the HV terminal is sealed inside the battery module, and at the same time, the sealing portion is directly fastened to the module busbar for electrical connection of the battery module.

[0040] Specifically, a groove for fastening the bolt is formed at the end of the sealing portion exposed to the outside, and a bolt for fastening the module busbar is inserted into the groove. Specifically, a thread for inserting the bolt is formed at a groove formed at the end of the sealing portion exposed to the outside. In this way, the module busbar is fastened between the sealing portion and the module busbar fastening bolt. Specifically, in a state where the module busbar is located between the sealing portion and the bolt for fastening the busbar, the module busbar is fixed by fastening the bolt for fastening the busbar at the sealing portion.

[0041] In a specific example, a thread is formed at a groove formed at the end of the sealing portion exposed to the outside, and a thread corresponding to the thread of the sealing portion is formed at a bolt for fastening the bus bar. The fastening method between the sealing portion and the bolt for fastening the bus bar can be modified in various ways. For example, an adhesive can also be applied or a hinge structure can be applied. However, considering the strength and the possibility of separation, it is advantageous to adopt a threaded fastening method. For example, a female thread is formed at a groove formed at the end of the sealing portion exposed to the outside, and a male thread corresponding to the female thread of the sealing portion is formed at a bolt for fastening the module bus bar.

[0042] In addition, the fastening direction between the opening of the battery module case and the sealing portion is consistent with the fastening direction between the sealing portion and the bolts for fastening the module bus bar. Therefore, when the module bus bar is located between the sealing portion and the bolts for fastening the module bus bar, if the bolts for fastening the module bus bar are fastened to the sealing portion, it is possible to prevent the fastening between the battery module case and the sealing portion from being released.

[0043] In another example, 3 to 5 recessed portions arranged at regular intervals are formed at the end of the sealing portion exposed to the outside. The sealing portion has a structure that minimizes the end exposed to the outside so as to prevent external moisture, etc. from being introduced into the battery module. A groove for fastening the bolt is formed at the sealing portion, and the bolt is used to fasten the bus bar, and 3 to 5 recessed portions arranged at regular intervals are formed around the groove. The recessed portion corresponds to a position where a sealing portion fastening tool contacts the position when the sealing portion is fastened to the battery module housing. The sealing portion fastening tool has a structure that a protrusion corresponding to the recessed portion of the sealing portion exposed to the outside is formed. In a state where the protrusion of the sealing portion fastening tool has been inserted into the recessed portion of the sealing portion, the sealing portion fastening tool can be rotated, thereby allowing the sealing portion to be mounted on the battery module housing.

[0044] In one example, the battery module according to the present invention further includes an O-ring located at the portion where the battery module housing contacts the sealing portion. The O-ring is made of a rubber material that can shrink and deform according to pressure, thereby applying airtightness. The battery module according to the present invention prevents the HV terminal from being exposed to the outside of the battery module by tightening the sealing portion. However, external moisture may penetrate along the contact portion between the battery module housing and the sealing portion. In the present invention, the moisture penetration path is blocked by positioning the O-ring at the contact portion between the battery module housing and the sealing portion. In the present invention, in addition to the O-ring, a silicone tape or a polytetrafluoroethylene (PTFE) tape, etc., can also be used to prevent water from penetrating along the contact portion between the battery module housing and the sealing portion. In addition, when a step is formed on the sealing portion, the O-ring can be located at the portion protruding through the step and the portion in contact with the battery module housing.

[0045] In one embodiment, the sealing portion may be made of a conductive metal material. This is used for electrical connection between the module bus bar and the HV terminal. Specifically, the conductive metal material constituting the sealing portion may be one selected from the group consisting of the following materials: iron, aluminum, copper, gold, silver, nickel, titanium, stainless steel or an alloy thereof, more specifically, copper is most preferred. In addition, the sealing portion may be made of a material homogeneous with the material of the HV terminal.

[0046] In one embodiment, one end of the sealing portion contacts the HV terminal, and the other end of the sealing portion is exposed to the outside of the battery module housing. In addition, the HV terminal is located in the battery module housing and is not exposed to the outside. Thus, the battery module of the present invention can be formed so that the HV terminal is not exposed to the outside, and can effectively prevent water and the like from penetrating into the battery module.

[0047] The present invention provides a battery pack including the above-mentioned battery module. In one embodiment, the battery pack according to the present invention includes: a battery pack case; and a plurality of battery modules, wherein the plurality of battery modules are accommodated in the battery pack case.

[0048] The battery module includes a plurality of secondary batteries, a battery module housing for accommodating the plurality of secondary batteries, and an electrical device installed around the module. In particular, the battery cell may be a pouch-type battery cell and have a structure including an electrode assembly, an electrolyte solution, and a pouch-shaped housing. The construction of such a battery cell is obvious to a person skilled in the art to which the present invention belongs, and a more detailed description thereof will be omitted. In addition, in the battery pack according to the present invention, various secondary batteries known at the time of filing the present invention may be adopted. In addition, the electrical device includes a battery management system (BMS) for monitoring and controlling the operation of the battery module, a battery disconnect unit (BDU) for controlling the electrical connection of the battery module, a fuse located between the battery module and the BMS and providing an overcurrent blocking function, and the like.

[0049] The battery pack case includes a tray in which the battery module is mounted at a lower side, and a battery pack cover covering a side and a top of the battery module, and the tray and the battery pack cover may be coupled by bolt fastening.

[0050] In addition, the present invention provides an energy storage device including the battery pack. The energy storage device is, for example, an energy storage system (ESS) capable of storing a large amount of electrical energy. In addition, the present invention provides a vehicle including the battery pack. The car includes a hybrid car, a plug-in car or an electric vehicle, etc. The vehicle includes various forms of vehicles using the battery pack as a main power source or an auxiliary power source.

[0051] Hereinafter, the present invention will be described in more detail by way of the accompanying drawings, etc. However, the embodiments described in the specification and the configurations described in the accompanying drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. It should be understood that various equivalents and variants may be used to replace them when the present application is submitted.

[0052] (First embodiment)

[0053] Figure 2 1 is a partial perspective view showing a sealing portion covering an HV terminal in a battery module according to an embodiment. Figure 2 , the battery module according to the present invention has the following structure: wherein the HV terminal is accommodated in the battery module housing, and the sealing portion 110 electrically connecting the HV terminal to the outside is inserted into the opening 113 formed in the battery module housing 101. A thread is formed in the opening so that the sealing portion can be fastened by a threaded fastening method. In addition, a groove for bolt fastening is formed in the central portion of the end portion exposed to the outside of the sealing portion 110, and the bolt 120 for fastening the module bus bar is fastened through the groove. Therefore, the sealing portion and the bolt for fastening the module bus bar are also fastened by a threaded fastening method.

[0054] The battery module according to the present invention is formed with the sealing portion 110, which prevents the HV terminal of the battery module from being exposed to the outside and allows the module bus bar to be fastened between the sealing portion 110 and the bolt 120 for fastening the module bus bar. A female thread is formed at a groove formed at the end of the sealing portion 110 exposed to the outside, and a male thread corresponding to the female thread of the sealing portion 110 is formed at the bolt 120 for fastening the bus bar. In the present invention, since a thread fastening method is used as a fastening method between the sealing portion 110 and the bolt 120 for fastening the module bus bar, the fastening is firm and reliable, and can be disassembled as needed.

[0055] Further, the sealing portion 110 has: a groove for fastening the bolt 120, the bolt being used to fasten the module bus bar; and three recessed portions 112 arranged at equal intervals, the three recessed portions 112 being formed around the groove. Each of the recessed portions 112 is located at a position where a sealing portion fastening tool is inserted when the sealing portion 110 is coupled to the battery module housing 101.

[0056] Figure 3 FIG. 1 is a partial cross-sectional view of a region where a sealing portion covering the HV terminal is formed in a battery module according to an embodiment of the present invention. Figure 3The battery module 100 according to the present invention includes a structure in which a plurality of battery cells 130 are accommodated in a battery module case 101. The electrode lead 131 of the battery cell 130 has a structure to be electrically connected to the HV terminal 102. The HV terminal 102 is connected to other battery modules for electrical connection between the battery modules 100, etc.

[0057] The HV terminal 102 has a structure that is electrically connected to the sealing portion 110. The sealing portion 110 is made of a conductive metal material such as copper or its alloy, or aluminum or its alloy, and is made of the same material as the material of the HV terminal 102. The sealing portion 110 has a structure that is fixed to the battery module housing 101 by threaded fastening. The sealing portion 110 is fastened to the battery module housing 101 via a sealing portion fastening tool described later. An O-ring 111 is located between the sealing portion 110 and the battery module housing 101. By forming the O-ring 111, the path through which external moisture penetrates is blocked along the portion where the sealing portion 110 is connected to the battery module housing 101.

[0058] Further, there is a groove formed with a thread at the end of the sealing portion 110 exposed to the outside, and the bolt 120 for fastening the module bus bar is fastened in the groove by thread fastening. Since the sealing portion 110 and the bolt 120 for fastening the module bus bar are fastened by thread fastening, they can be disassembled as needed.

[0059] Further, one end of the sealing portion 110 contacts the HV terminal 102, and the other end of the sealing portion is exposed to the outside of the battery module housing, thereby contacting the module bus bar. The HV terminal 102 has an insertion groove 103, and in a state where one end of the sealing portion 110 has been inserted into the insertion groove 103, the one end of the sealing portion 110 contacts the HV terminal 102. At this time, the diameter of the portion of the sealing portion exposed to the outside is larger than the diameter of the opening 113, and the diameter of the portion inserted into the insertion groove 103 is smaller than the diameter of the opening 113. Thus, two steps are formed in the sealing portion 110.

[0060] (Second embodiment)

[0061] Figure 4 1 is a partial perspective view showing a process of fastening the sealing portion to the battery module housing in a battery module according to an embodiment of the present invention. Figure 4, the sealing part 110 has a groove for fastening a bolt 120, the bolt 120 is used to fasten the module bus bar, and three recessed parts arranged at equal intervals are formed around the groove. Each of the recessed parts is located at such a position that the sealing part fastening tool 210 contacts the position when the sealing part 110 is connected to the battery module housing 101. The sealing part fastening tool 210 has a structure formed with three protrusions 212 extending in the main body 211. The protrusion 212 of the sealing part fastening tool 210 has a shape corresponding to the recessed part of the sealing part 110 exposed to the outside. In a state where the protrusion 212 of the sealing part fastening tool 210 has been inserted into the recessed part of the sealing part 110, the sealing part fastening tool 210 is rotated, thereby allowing the sealing part 110 to be installed on the battery module housing 101.

[0062] In addition, as described above, the fastening between the battery module housing 101 and the sealing portion 110 and the fastening between the sealing portion 110 and the bolts 120 for fastening the module bus bar are respectively performed by a screw fastening scheme. In addition, the fastening direction between the opening of the battery module housing 101 and the sealing portion 110 is consistent with the fastening direction between the sealing portion 110 and the bolts 120 for fastening the module bus bar. Therefore, even if the bolts 120 for fastening the module bus bar are rotated in the tightening direction, the fastening between the battery module housing 101 and the sealing portion 110 will not be released.

[0063] (Third Embodiment)

[0064] Figure 5 1 is a partial cross-sectional view showing a state in which a module bus bar is fastened to a sealing portion covering the HV terminal in a battery module according to an embodiment of the present invention. Figure 5 , the HV terminal 102 has a structure to be accommodated inside the battery module housing, and has a structure to be electrically connected to the sealing portion 110. The sealing portion 110 is fixed at the battery module housing by threaded fastening, and an O-ring 111 is located on a contact portion between the sealing portion 110 and the battery module housing 101. By forming the O-ring 111, a path through which external moisture penetrates is blocked along a portion where the sealing portion 110 is coupled to the battery module housing 101.

[0065] A groove having a thread formed therein is provided at the end of the sealing portion 110 exposed to the outside, and a bolt 120 for fastening the module bus bar is fastened in the groove by thread fastening. Therefore, the bolt 120 for fastening the module bus bar can be removed as needed.

[0066] The module bus bar 140 is fastened between the sealing portion 110 and the bolt 120 for fastening the module bus bar. The module bus bar 140 performs electrical connection between battery modules and is formed of, for example, copper or an alloy thereof. The end of the module bus bar 140 has a structure in which a recess or a hole is formed so that the side surface of the bolt 120 for fastening the module bus bar is wrapped. In a state where the recess of the module bus bar 140 is engaged with the side of the bolt 120 for fastening the module bus bar, the bolt 120 for fastening the module bus bar is rotated to be fixed at the sealing portion 110.

[0067] The above description is only an explanation of the technical idea of ​​the present invention, and those skilled in the art to which the present invention belongs can make various modifications and changes without departing from the essential features of the present invention. Therefore, the drawings disclosed in the present invention are not intended to limit the technical idea of ​​the present invention but are used to describe the present invention, and the scope of the technical idea of ​​the present invention is not limited by these drawings. The scope of the present invention should be interpreted in accordance with the attached claims, and all technical ideas within the scope equivalent to them should be understood to be included in the scope of the present invention.

[0068] Description of Reference Numerals

[0069] 10, 100: Battery module

[0070] 11, 101: Battery module housing

[0071] 12, 102: HV terminal

[0072] 103: Insert into groove

[0073] 110: Sealing part

[0074] 111: O-ring

[0075] 112: Recessed part

[0076] 113: Opening

[0077] 120: Bolt

[0078] 130: Battery Cell

[0079] 131: Electrode sheet or lead wire

[0080] 140: Module busbar

[0081] 210: Sealing part tightening tool

[0082] 211: Main body

[0083] 212: Protrusion

Claims

1. A battery module, comprising: a battery module housing configured to accommodate a plurality of battery cells and having an opening at one side, the opening having a thread; a high voltage terminal having a structure electrically connected to electrode leads from the plurality of battery cells; as well as a sealing portion configured to be inserted into and fastened to the opening of the battery module housing, wherein the sealing portion allows the high voltage terminal to be electrically connected to the outside, one end of the sealing portion contacts the high voltage terminal, and the other end of the sealing portion is exposed to the outside of the battery module housing, thereby contacting the module bus bar, wherein an insertion groove is formed in the high voltage terminal, and one end of the sealing portion is inserted into the insertion groove, The sealing portion is made of a conductive metal material, and the high voltage terminal is located in the battery module housing and is not exposed to the outside.

2. The battery module according to claim 1, wherein: The sealing portion has a structure in which a diameter of an end portion thereof exposed to the outside is larger than a diameter of the opening.

3. The battery module according to claim 1, wherein: The sealing portion has a structure in which a diameter of a portion inserted into the insertion groove of the high voltage terminal is smaller than a diameter of the opening.

4. The battery module according to claim 1, wherein: The module bus bar is fastened between the sealing portion and a bolt for fastening the module bus bar, and The fastening between the battery module housing and the sealing portion and the fastening between the sealing portion and the bolts for fastening the module busbar are respectively performed by a threaded fastening scheme.

5. The battery module according to claim 4, wherein: A groove for fastening the bolt is formed at an end portion of the sealing portion exposed to the outside, and a bolt for fastening the module bus bar is inserted into the groove.

6. The battery module according to claim 5, wherein: A thread for inserting a bolt is formed at the groove formed at the end portion of the sealing portion exposed to the outside.

7. The battery module according to claim 4, wherein: A fastening direction between the battery module case and the sealing portion coincides with a fastening direction between the sealing portion and the bolt for fastening the module bus bar.

8. The battery module according to claim 1, wherein: Three to five recessed portions arranged at regular intervals are formed at an end portion of the sealing portion exposed to the outside. 9 . The battery module according to claim 1 , further comprising an O-ring located at a portion where the battery module case contacts the sealing portion.

10. A battery pack comprising: Battery pack housing; and a plurality of battery modules, the plurality of battery modules being accommodated in the battery pack housing, Wherein, the battery module is the battery module according to any one of claims 1 to 9.

11. An energy storage device comprising the battery pack according to claim 10.

12. A vehicle comprising the battery pack according to claim 10.

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