Battery pack and vehicle

Abstract

The utility model discloses a battery pack and a vehicle, the battery pack comprises a liquid cooling plate, a battery pack box body and a conductive piece, the conductive piece is provided with a first slot, the conductive piece is inserted on a second conductive part of the battery pack box body through the first slot, and the conductive piece abuts against the second conductive part; the first conductive part of the liquid cooling plate abuts against the conductive piece. In the embodiment of the utility model, the conductive piece is abutted against the first conductive part in the liquid cooling plate and the second conductive part in the battery pack box body, so that the reliability of equipotential connection can be improved, and reliable equipotential connection between the liquid cooling plate and the battery pack box body can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of equipotential technology, especially to a battery pack and vehicle. BACKGROUND

[0002] For the battery pack in the vehicle, equipotential connection is needed to protect human safety, ensure electrical safety and ensure normal operation of the electrical system.

[0003] The equipotential connection of the battery pack is an important measure to ensure that the potentials between different conductive components inside the battery pack are the same, mainly used to improve the safety, performance and reliability of the battery pack. The core goal of equipotential connection is to eliminate or reduce the potential difference in the battery pack, thereby reducing the risk of partial discharge, electric leakage, electric shock and electrochemical corrosion.

[0004] In the related art, the battery pack includes a box body and a liquid cooling plate, and the liquid cooling plate needs to be connected with the box body in equipotential.

[0005] How to achieve reliable equipotential connection between the liquid cooling plate and the box body is an urgent problem to be solved at present. UTILITY MODEL CONTENTS

[0006] The utility model provides a battery pack and vehicle, aims at improving the reliability of equipotential connection.

[0007] In the first aspect of the utility model implementation, first, a battery pack is provided, including a liquid cooling plate, a battery pack box body and a conductive part;

[0008] The conductive part has a first slot, the conductive part is inserted on the second conductive part of the battery pack box body through the first slot, and the conductive part abuts against the second conductive part.

[0009] The first conductive part of the liquid cooling plate abuts against the conductive part.

[0010] Optionally, the conductive part also has a second slot, the first conductive part is inserted on the second slot, and at least part of the first conductive part abuts against the bottom wall of the second slot.

[0011] Optionally, the slot of the first slot faces downward, and the top wall of the first slot abuts against at least part of the top end of the second conductive part.

[0012] Optionally, the second conductive part includes at least one expansion beam vertical rib and / or at least one longitudinal beam assembly in the battery pack box body.

[0013] The first slot in the conductive part includes at least one vertical rib slot matched with at least one expansion beam vertical rib and / or at least one longitudinal beam slot matched with at least one longitudinal beam assembly.

[0014] Optionally, the liquid cooling plate comprises a metal body, and the first conductive part is at least part of an end of the metal body.

[0015] The liquid cooling plate further comprises an insulating coating, which covers part of the metal body other than the first conductive part.

[0016] Optionally, the battery pack case has a reference surface, and along the height direction of the battery pack case, the distance between the first conductive part and the reference surface is less than the distance between the bottom wall of the second slot and the reference surface, and the difference is greater than or equal to 2mm.

[0017] Optionally, the battery pack case has a reference surface, and along the height direction of the battery pack case, the distance between the part of the top end of the second conductive part that abuts against the first slot and the reference surface is greater than the distance between the top wall of the first slot and the reference surface, and the difference is greater than or equal to 2mm.

[0018] Optionally, the conductive part is a conductive elastic material.

[0019] Optionally, the conductive part is a conductive foam.

[0020] In the second aspect of the embodiment of the present application, a vehicle is also provided, which comprises the battery pack as described above.

[0021] In the embodiment of the present application, the liquid cooling plate is connected to the battery pack case in equal potential through the conductive path of the first conductive part, the conductive part and the second conductive part. In the embodiment of the present application, the conductive part abuts against the first conductive part in the liquid cooling plate and the second conductive part in the battery pack case, which can improve the reliability of the equal potential connection, so as to realize reliable equal potential connection between the liquid cooling plate and the battery pack case. In addition, the conductive part is directly inserted on the second conductive part of the battery pack case, which is more convenient and fast compared with the mode of realizing equal potential connection between the liquid cooling plate and the battery pack case through a wire harness. The inserted mode can also limit the conductive part to a certain extent, which can avoid displacement of the conductive part, so as to further improve the reliability of the equal potential connection. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description.

[0023] Figure 1 The structure diagram of the conductive part and the battery pack case in the battery pack provided in the embodiment of the present application is shown.

[0024] Figure 2The cross-section structure diagram of the battery pack is provided in the embodiment of the utility model Figure 1 ;

[0025] Figure 3 The cross-section structure diagram of the battery pack is provided in the embodiment of the utility model Figure 1 ;

[0026] Figure 4 The structure diagram of a conductive part in the battery pack is provided in the embodiment of the utility model

[0027] Figure 5 The structure diagram of another conductive part in the battery pack is provided in the embodiment of the utility model

[0028] Figure 6 The structure diagram of a side liquid cooling plate in the battery pack is provided in the embodiment of the utility model

[0029] Figure 7 The structure diagram of the battery pack box and the battery module in the battery pack is provided in the embodiment of the utility model.

[0030] Reference signs:

[0031] 1-conductive part, 11-first slot, 111-rib slot, 112-longitudinal beam slot, 12-second slot, 2-battery module, 21-liquid cooling plate, 22-battery cell assembly, 3-battery pack box, 31-box body, 32-bulging beam, 321-bulging beam rib, 322-bulging beam side plate, 33-longitudinal beam assembly, 331-longitudinal beam, 332-longitudinal beam fixing bolt. DETAILED DESCRIPTION

[0032] The technical scheme in the embodiment of the utility model will be described below with reference to the drawings in the embodiment of the utility model.

[0033] The embodiments of the utility model are only used for explaining the utility model and are not used for limiting the scope of the utility model. In the following paragraphs, the utility model is described in a more specific manner with reference to the drawings. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the utility model.

[0034] In the related art, the battery pack includes a box body and a liquid cooling plate, and the liquid cooling plate needs to be connected to the box body in the same potential. How to realize reliable equal potential connection between the liquid cooling plate and the box body is an urgent problem to be solved at present. In order to solve the above problem, the embodiment of the utility model provides a battery pack and a vehicle, and the battery pack and the vehicle mentioned above will be described in detail.

[0035] In the first aspect, with reference to Figures 1 to 5The utility model discloses a battery pack including liquid cooling plate 21, battery pack box 3 and conducting part 1, conducting part 1 has first slot 11, conducting part 1 is inserted on the second conducting part of battery pack box 3 through first slot 11, and conducting part 1 is in abutment with the second conducting part, and the first conducting part of liquid cooling plate 21 is in abutment with conducting part 1.

[0036] Among them, the number of battery pack box 3 is usually one, and the liquid cooling plate 21 is specifically a side liquid cooling plate, and the number of liquid cooling plate 21 is usually multiple, and multiple liquid cooling plates 21 are connected to one battery pack box 3 by at least one conducting part 1 to realize equipotential connection.

[0037] The first conducting part of at least one liquid cooling plate 21 applies a downward pressure to a conducting part 1, and the conducting part 1 is in abutment with at least one of the first conducting part and the second conducting part of the battery pack box 3 under the action of the downward pressure.

[0038] The conducting part 1 has at least one first slot 11, and the conducting part 1 is inserted on at least one second conducting part of the battery pack box 3 through the at least one first slot 11. Through the cooperation of the first slot 11 and the second conducting part, the movement of the conducting part 1 along the width direction of the battery pack box 3 can be limited. The width direction of the battery pack box 3 can refer to the direction shown by the arrow A in Figure 1 、 Figure 2 、 Figure 7 .

[0039] Referring to Figure 7 , the liquid cooling plate 21 is connected to the battery cell assembly 22, and the battery cell assembly 22 is connected to the battery pack box 3. The liquid cooling plate 21 and the battery cell assembly 22 are integrated together to form a battery module 2, and the battery module 2 is connected to the box body 31. The liquid cooling plate 21 is usually fixed by being bonded to the battery cell assembly 22 through thermal conductive glue, and the battery cell assembly 22 is usually fixed by being bonded to the box body 31 of the battery pack box 3 through thermal conductive glue. The first conducting part in the liquid cooling plate 21 has a certain electrical conductivity. The first conducting part in the liquid cooling plate 21 is specifically a metal part in the liquid cooling plate 21 that is not sprayed with an insulating coating.

[0040] The battery pack box 3 further includes an expansion beam 32 and a longitudinal beam assembly 33, the expansion beam 32 is fixed on the box body 31, the expansion beam 32 includes a plurality of expansion beam ribs 321 and two expansion beam side plates 322 oppositely arranged along the width direction thereof, the plurality of expansion beam ribs 321 are located between the two expansion beam side plates 322, and the plurality of expansion beam ribs 321 are arranged at intervals along the length direction of the expansion beam 32. The second conducting part in the battery pack box 3 has a certain electrical conductivity. The second conducting part in the battery pack box 3 can include at least one expansion beam rib 321 and / or at least one longitudinal beam assembly 33. The conducting part 1 can be located between the two expansion beam side plates 322 in an expansion beam 32.

[0041] The number of the first slots 11 can be 1-3. The slot opening of the first slot 11 is generally downward, and a bevel chamfer can be arranged at the slot opening of the first slot 11 to facilitate assembly of the conductive part 1. The width of the bevel chamfer can be set according to actual needs, for example, can be set to be greater than or equal to 1 mm.

[0042] The liquid cooling plate 21 can be designed to interfere with the conductive part 1, so that after the liquid cooling plate 21 is installed in place, the first conductive part in the liquid cooling plate 21 applies a downward pressure to the conductive part 1. The conductive part 1 is in abutment with at least one second conductive part in the battery pack box body 3 under the action of the downward pressure. The liquid cooling plate 21 realizes equipotential connection with the battery pack box body 3 through the conductive path of the first conductive part, the conductive part 1, and the second conductive part.

[0043] In the embodiment of the utility model, the liquid cooling plate 21 realizes equipotential connection with the battery pack box body 3 through the conductive path of the first conductive part, the conductive part 1, and the second conductive part. In the embodiment of the utility model, the conductive part 1 is in abutment with the first conductive part in the liquid cooling plate 21 and the second conductive part in the battery pack box body 3, which can improve the reliability of equipotential connection, thereby realizing reliable equipotential connection between the liquid cooling plate 21 and the battery pack box body 3. In addition, the conductive part 1 is directly inserted on the second conductive part of the battery pack box body 3, which is more convenient and fast compared with the mode of realizing equipotential connection between the liquid cooling plate 21 and the battery pack box body 3 through a wire harness. In addition, the inserted mode can also have a certain limiting effect on the conductive part 1, which can avoid displacement of the conductive part 1, thereby further improving the reliability of equipotential connection.

[0044] In an optional embodiment of the utility model, referring to Figures 2 to 5 , the conductive part 1 also has a second slot 12, and the first conductive part is inserted on the second slot 12; at least part of the first conductive part is in abutment with the bottom wall of the second slot 12.

[0045] Among them, a conductive part 1 has at least one second slot 12, and the first conductive part of at least one liquid cooling plate 21 is inserted on the at least one second slot 12 of the conductive part 1. The first conductive part in the liquid cooling plate 21 applies a downward pressure to the bottom wall of the second slot 12, and the bottom wall of the second slot 12 is in abutment with the first conductive part in the liquid cooling plate 21 under the action of the downward pressure.

[0046] The slot of the second slot 12 is upward. The shape and size of the second slot 12 match the shape and size of the liquid cooling plate 21, for example, when the liquid cooling plate 21 is in the shape of an elongated plate structure, the shape of the second slot 12 is rectangular. The slot of the second slot 12 can be provided with an inclined chamfer to facilitate the insertion of the liquid cooling plate 21. The width of the inclined chamfer can be set according to actual needs, for example, it can be greater than or equal to 1mm. The second slot 12 is gap fit with the liquid cooling plate 21, and the single side gap of the gap fit can be about 1mm.

[0047] Referring to Figure 5 , the conductive part 1 can have only one second slot 12, and the depth of the second slot 12 can be less than the depth of the first slot 11. Referring to Figures 2 to 4 , the conductive part 1 can have two second slots 12, and the depth of the second slot 12 can be greater than the depth of the first slot 11.

[0048] In this embodiment, the second slot 12 can play a guiding role for the liquid cooling plate 21 during installation of the liquid cooling plate 21. In addition, through the cooperation of the second slot 12 and the liquid cooling plate 21, the movement of the conductive part 1 along the width direction of the battery pack box body 3 can be limited, and the limiting effect on the conductive part 1 can be further ensured.

[0049] In an optional embodiment of the utility model, referring to Figures 2 to 5 , the slot of the first slot 11 is downward, and at least part of the top wall of the first slot 11 abuts against the top end of the second conductive part. The first slot 11 cooperates with the second conductive part to realize insertion, and at least part of the top wall of the first slot 11 also abuts against the top end of the second conductive part, that is, the first slot 11 can realize abutment with the second conductive part, and it is not necessary to additionally set other structures to abut against the second conductive part.

[0050] In an optional embodiment of the utility model, referring to Figures 2 to 5 , the second conductive part includes at least one expansion beam stud 321 and / or at least one longitudinal beam assembly 33 in the battery pack box body 3; the first slot 11 in the conductive part 1 includes at least one stud slot 111 cooperating with the at least one expansion beam stud 321 and / or at least one longitudinal beam slot 112 cooperating with the at least one longitudinal beam assembly 33.

[0051] Among them, the shape and size of the stud slot 111 match the shape and size of the expansion beam stud 321, and the shape and size of the longitudinal beam slot 112 match the shape and size of the longitudinal beam assembly 33. The shape of the stud slot 111 and the longitudinal beam slot 112 is usually rectangular. The stud slot 111 is gap fit with the expansion beam stud 321, and the longitudinal beam slot 112 is gap fit with the longitudinal beam assembly 33, and the single side gap of the gap fit can be about 1mm.

[0052] The bottom wall of the stud slot 111 abuts against the bottom end of the stud of the expansion beam 321, and the bottom wall of the longitudinal beam slot 112 abuts against the top end of the longitudinal beam assembly 33. The longitudinal beam assembly 33 comprises a longitudinal beam 331 and a longitudinal beam fixing bolt 332, and the longitudinal beam 331 can be fixed on the expansion beam 32 through the longitudinal beam fixing bolt 332. Preferably, the longitudinal beam slot 112 is matched with the longitudinal beam 331 and the longitudinal beam fixing bolt 332, and the bottom wall of the longitudinal beam slot 112 abuts against the top end of the longitudinal beam fixing bolt 332.

[0053] With reference to Figure 5 The first slot 11 in the conductive part 1 can only comprise one stud slot 111. With reference to Figures 2 to 4 The first slot 11 in the conductive part 1 can comprise two stud slots 111 and one longitudinal beam slot 112, wherein the longitudinal beam slot 112 is located between the two stud slots 111. In this embodiment, when the second conductive part comprises at least one stud of the expansion beam 321 and at least one longitudinal beam assembly 33, the conductive part 1 simultaneously abuts against at least one stud of the expansion beam 321 and at least one longitudinal beam assembly 33, and a plurality of reliable equipotential points can be formed, thereby further improving the reliability of the equipotential connection.

[0054] In an optional embodiment of the utility model, the liquid cooling plate 21 comprises a metal main body, and the first conductive part is at least part of an end of the metal main body in the length direction thereof; the liquid cooling plate 21 further comprises an insulating coating, and the insulating coating covers part of the metal main body other than the first conductive part.

[0055] The first conductive part is at least part of an end of the metal main body in the length direction thereof. The first conductive part can be the entire end of the metal main body, or can be the bottom of the end of the metal main body. Specifically, the bottom of the end of the metal main body abuts against the bottom wall of the second slot 12. In the length direction of the liquid cooling plate 21, the size of the first conductive part is preferably greater than or equal to the thickness of the conductive part 1. The thickness of the conductive part 1 can be 2mm-5mm. The length direction of the liquid cooling plate 21 is parallel to the length direction of the battery pack box body 3.

[0056] The insulating coating can be an epoxy resin coating, an acrylic coating, a ceramic coating, etc. The insulating coating can be formed on the metal main body in a spraying manner. When spraying, the first conductive part is hidden so that the insulating coating only covers part of the metal main body other than the first conductive part, and does not cover the first conductive part. In this embodiment, through the setting of the insulating coating, the insulation of most of the liquid cooling plate 21 can be realized.

[0057] In an optional embodiment of the utility model, with reference to Figure 2 And Figure 3, the battery pack box body 3 has a reference surface, the distance between the first conductive part and the reference surface is less than the distance between the bottom wall of the second slot 12 and the reference surface in the height direction of the battery pack box body 3, and the difference is greater than or equal to 2mm; the distance between the part of the top end of the second conductive part abutting against the first slot 11 and the reference surface is greater than the distance between the top wall of the first slot 11 and the reference surface in the height direction of the battery pack box body 3, and the difference is greater than or equal to 2mm.

[0058] The height direction of the battery pack box body 3 can refer to the direction shown by the B arrow in the figure. Figure 2 The reference surface can be the bottom surface of the battery pack box body 3. The distance between the first conductive part and the reference surface is less than the distance between the bottom wall of the second slot 12 and the reference surface, that is, the first conductive part interferes with the bottom wall of the second slot 12, and the interference amount is greater than or equal to 2mm, so as to ensure the reliable abutment of the first conductive part and the bottom wall of the second slot 12. The interference design refers to intentionally manufacturing an overlap or interference in size between two cooperating parts, so that they are pressed against each other during assembly, generating a downward pressure.

[0059] The distance between the part of the top end of the second conductive part abutting against the first slot 11 and the reference surface is greater than the distance between the top wall of the first slot 11 and the reference surface, that is, the part of the top end of the second conductive part abutting against the first slot 11 interferes with the top wall of the first slot 11, and the interference amount is greater than or equal to 2mm, so as to ensure the reliable abutment of the second conductive part and the top wall of the first slot 11.

[0060] When the second conductive part includes the expansion beam stud 321 and the longitudinal beam assembly 33, and the first slot 11 includes the stud slot 111 and the longitudinal beam slot 112, at least part of the end of the metal body in the liquid cooling plate 21 interferes with the bottom wall of the second slot 12, and the interference amount is greater than or equal to 2mm; the part of the top end of the expansion beam stud 321 cooperating with the stud slot 111 interferes with the top wall of the stud slot 111, and the interference amount is greater than or equal to 2mm; the part of the top end of the longitudinal beam assembly 33 cooperating with the longitudinal beam slot 112, for example, the top end of the longitudinal beam fixing bolt 332, interferes with the top wall of the longitudinal beam slot 112, and the interference amount is greater than or equal to 2mm.

[0061] In an optional embodiment of the utility model, the conductive part 1 is made of conductive elastic material. The conductive part 1 can be made of conductive foam, conductive rubber, etc. Since the conductive part 1 has certain flexibility and elasticity, when the first conductive part in the liquid cooling plate 21 applies a downward pressure to the conductive part 1, the conductive part 1 will abut against the first conductive part in the liquid cooling plate 21 accordingly. By utilizing the flexibility and elasticity of the conductive part 1 itself and the downward pressure applied by the first conductive part in the liquid cooling plate 21 to the conductive part 1, the conductive part 1 can abut against the first conductive part in the liquid cooling plate 21 and the second conductive part in the battery pack box body 3.

[0062] In an optional embodiment of the present application, the conductive member 1 is conductive foam. The conductive foam is foam coated with a conductive coating, and the foam can be polyurethane (PU) foam, vinyl foam, etc., and the material of the conductive coating can be copper, silver, nickel, carbon, etc. The conductive foam has good flexibility and elasticity, and the weight of the conductive foam is relatively light, and the cost is relatively low.

[0063] In an optional embodiment of the present application, the number of conductive members 1 is multiple, and the multiple conductive members 1 are arranged along the width direction of the battery pack box body 3; or the number of conductive members 1 is one, and the length direction of the conductive member 1 is parallel to the width direction of the battery pack box body 3.

[0064] When the number of conductive members 1 is multiple, the specific number of conductive members 1 is determined according to the number of liquid cooling plates 21, and the specific number of conductive members 1 is less than or equal to the number of liquid cooling plates 21, and the specific number of conductive members 1 can be 4-10. When the number of conductive members 1 is multiple, the equipotential connection of multiple liquid cooling plates 21 and one battery pack box body 3 can be realized, and the material usage can be saved, thereby reducing the cost.

[0065] In the second aspect, the present application provides a vehicle, and the vehicle comprises the battery pack provided in the first aspect. Since the vehicle comprises the above-mentioned battery pack, the vehicle also has the beneficial effects of the above-mentioned battery pack, which will not be described here.

[0066] It should be noted that, in this document, the terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0067] It should be understood that when an element, or components are referred to as being "on" another element, or components, it can be directly on another element or intervening elements can also be present. In contrast, when an element is referred to as being "connected" to another element, or components, it can be directly connected to the other element or intervening elements can be present. When an element such as a layer, or component is referred to as being "disposed on" or "formed on" another element, or components, it can be directly disposed on or formed on another element or intervening elements can also be present. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0068] The various embodiments in the specification are described in a related manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the difference from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

[0069] The above only the preferred embodiment of the present application, and not for limiting the scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, are included in the scope of the present application.

[0070] The battery pack and vehicle provided by the present application are described in detail above, and the principle and implementation mode of the present application are described by applying specific examples in this paper. The above embodiment is only used to help understand the structure and core idea of the present application. Meanwhile, for the general technical personnel in the field, according to the idea of the present application, the specific implementation mode and application range will be changed. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A battery pack, characterized by, The battery pack comprises a liquid cooling plate, a battery pack box body and an electrically conductive piece. The electrically conductive piece has a first slot, and the electrically conductive piece is inserted into a second electrically conductive part of the battery pack box body through the first slot. The first electrically conductive part of the liquid cooling plate abuts against the electrically conductive piece.

2. The battery pack of claim 1, wherein, The electrically conductive piece further has a second slot, and the first electrically conductive part is inserted into the second slot.

3. The battery pack of claim 1 or 2, wherein, The slot opening of the first slot faces downward, and the top wall of the first slot at least partially abuts against the top end of the second electrically conductive part.

4. The battery pack of claim 1 or 2, wherein, The second electrically conductive part comprises at least one expansion beam stud and / or at least one longitudinal beam assembly in the battery pack box body. The first slot in the electrically conductive piece comprises at least one stud slot matched with the at least one expansion beam stud and / or at least one longitudinal beam slot matched with the at least one longitudinal beam assembly.

5. The battery pack of claim 1 or 2, wherein, The liquid cooling plate comprises a metal body, and the first electrically conductive part is at least part of the end of the metal body. The liquid cooling plate further comprises an insulating coating layer, and the insulating coating layer covers part of the metal body other than the first electrically conductive part.

6. The battery pack of claim 2, wherein, The battery pack box body has a reference surface, and along the height direction of the battery pack box body, the distance between the first electrically conductive part and the reference surface is less than the distance between the bottom wall of the second slot and the reference surface, and the difference is greater than or equal to 2 mm.

7. The battery pack of claim 3, wherein, The battery pack box body has a reference surface, and along the height direction of the battery pack box body, the distance between the part of the top end of the second electrically conductive part that abuts against the first slot and the reference surface is greater than the distance between the top wall of the first slot and the reference surface, and the difference is greater than or equal to 2 mm.

8. The battery pack of claim 1 or 2, wherein, The electrically conductive piece is made of an electrically conductive elastic material.

9. The battery pack of claim 8, wherein, The electrically conductive piece is made of an electrically conductive foam.

10. A vehicle characterized by comprising: The battery pack comprises the battery pack as claimed in any one of claims 1 to 9.

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