Battery device

Abstract

The utility model relates to the technical field of batteries, and provides a battery device which comprises a heat exchange pipeline and a single battery, a heat exchange channel is formed in the heat exchange pipeline, the single battery comprises a main body and a pole component, two end side parts are respectively connected to two opposite ends of a middle part along the length direction of the single battery, and two end side parts are respectively connected to two opposite ends of the middle part along the width direction of the single battery. The size of the end side part is smaller than that of the middle part; the terminal post assembly is arranged on the end side part, the end side part is in contact with the heat exchange pipeline, orthographic projections of the terminal post assembly and the heat exchange pipeline on the same plane coincide in the arrangement direction of the end side part and the heat exchange pipeline, and the terminal post assembly can be arranged right opposite to the heat exchange pipeline. And the pole assembly is the most serious heating position in the use process of the single battery, so that the temperature of the pole assembly can be quickly reduced by shortening the heat transfer path from the pole assembly to the heat exchange pipeline, the normal use of the single battery is ensured, and the safe use performance of the battery device is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery device. Background Art

[0002] In the related art, a battery device may include multiple single cells. The battery device may generate a large amount of heat during use. In order to ensure the normal operation of the battery device, a cooling plate may be used to quickly dissipate heat from the single cells. However, due to the structural limitations of the single cells, the heat dissipation performance of the single cells may be affected, which in turn affects the normal use of the battery device. Utility Model Content

[0003] The utility model provides a battery device to improve the use performance of the battery device.

[0004] The utility model provides a battery device, comprising: a heat exchange pipeline and a single battery, wherein the heat exchange pipeline is formed with a heat exchange channel, the single battery comprises a main body and a pole assembly, the main body comprises a middle part and two end side parts, along the length direction of the single battery, the two end side parts are respectively connected to the opposite ends of the middle part, and along the width direction of the single battery, the size of the end side part is smaller than the size of the middle part;

[0005] Among them, the pole assembly is arranged on the end side part, the end side part is in contact with the heat exchange pipeline, and along the arrangement direction of the end side part and the heat exchange pipeline, the positive projections of the pole assembly and the heat exchange pipeline on the same plane coincide with each other.

[0006] A battery device of one embodiment of the utility model includes a heat exchange pipeline and a single cell. The single cell is in heat exchange contact with the heat exchange pipeline, and then heat exchange with the single cell can be formed through the heat exchange pipeline, thereby improving the use performance of the single cell. The single cell includes a main body and a pole assembly, and the main body includes a middle part and two end side parts. In the width direction of the single cell, the size of the end side part is smaller than the size of the middle part, and the pole assembly is arranged on the end side part. By making the end side part contact with the heat exchange pipeline, and along the arrangement direction of the end side part and the heat exchange pipeline, the positive projections of the pole assembly and the heat exchange pipeline on the same plane coincide, that is, the pole assembly can be arranged directly opposite to the heat exchange pipeline, and the pole assembly is the position with the most serious heat generation during the use of the single cell, thereby shortening the heat transfer path from the pole assembly to the heat exchange pipeline, and quickly reducing the temperature of the pole assembly, thereby ensuring the normal use of the single cell, and then improving the safe use performance of the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:

[0008] Figure 1 is a schematic diagram of a partial structure of a battery device according to an exemplary embodiment;

[0009] Figure 2 is a schematic diagram of a partial structure of a battery device according to another exemplary embodiment;

[0010] Figure 3 is a schematic diagram of a partial cross-sectional structure of a battery device according to an exemplary embodiment;

[0011] Figure 4 FIG. 4 is a schematic structural diagram of a single cell of a battery device according to an exemplary embodiment.

[0012] The following are the descriptions of the reference numerals:

[0013] 10. Bottom heat exchange structure; 11. Heat exchange channel; 12. Main board; 13. Heat exchange pipeline; 20. Single battery; 21. Main body; 211. Middle part; 212. End side part; 213. Large surface; 214. Side surface; 22. Pole assembly; 23. Weak part; 24. Isolation piece; 30. Battery case. DETAILED DESCRIPTION

[0014] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0015] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0016] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0017] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0018] An embodiment of the present utility model provides a battery device, please refer to Figures 1 to 4 The battery device includes: a heat exchange pipeline 13 and a single battery 20, the heat exchange pipeline 13 is formed with a heat exchange channel 11, the single battery 20 includes a main body 21 and a pole assembly 22, the main body 21 includes a middle part 211 and two end side parts 212, along the length direction of the single battery 20, the two end side parts 212 are respectively connected to the opposite ends of the middle part 211, along the width direction of the single battery 20, the size of the end side part 212 is smaller than the size of the middle part 211; wherein, the pole assembly 22 is arranged on the end side part 212, the end side part 212 is in contact with the heat exchange pipeline 13, and along the arrangement direction of the end side part 212 and the heat exchange pipeline 13, the positive projections of the pole assembly 22 and the heat exchange pipeline 13 on the same plane coincide with each other.

[0019] A battery device according to an embodiment of the present invention includes a heat exchange pipeline 13 and a single battery 20 . The single battery 20 is in heat exchange contact with the heat exchange pipeline 13 , and heat exchange with the single battery 20 can be formed through the heat exchange pipeline 13 , thereby improving the performance of the single battery 20 . The single cell 20 includes a main body 21 and a pole assembly 22. The main body 21 includes a middle portion 211 and two end portions 212. Along the width direction of the single cell 20, the size of the end portion 212 is smaller than that of the middle portion 211, and the pole assembly 22 is arranged on the end portion 212. By making the end portion 212 contact with the heat exchange pipeline 13, and along the arrangement direction of the end portion 212 and the heat exchange pipeline 13, the positive projections of the pole assembly 22 and the heat exchange pipeline 13 on the same plane coincide with each other, that is, the pole assembly 22 can be arranged directly opposite to the heat exchange pipeline 13, and the pole assembly 22 is the position where heat is most serious during the use of the single cell 20. Therefore, the temperature of the pole assembly 22 can be quickly reduced by shortening the heat transfer path from the pole assembly 22 to the heat exchange pipeline 13, thereby ensuring the normal use of the single cell 20 and further improving the safe use performance of the battery device.

[0020] It should be noted that, combined with Figure 1 As shown, the battery device includes a heat exchange pipeline 13 and a single battery 20. The single battery 20 can be in contact with the heat exchange pipeline 13, and then the single battery 20 can be cooled by the heat exchange pipeline 13, thereby avoiding the risk of thermal runaway of the battery device and improving the safe use performance of the battery device.

[0021] like Figure 3 and Figure 4 As shown, the single battery 20 includes a main body 21 and a pole assembly 22 , the pole assembly 22 is arranged on the main body 21 , and at least two single batteries 20 can be connected in series or in parallel through a bus bar, for example, the bus bar can be welded to the pole assembly 22 .

[0022] Combination Figure 4 As shown, the main body 21 includes a middle portion 211 and two end side portions 212. Along the length direction of the single battery 20, the two end side portions 212 are respectively connected to the opposite ends of the middle portion 211, and along the width direction of the single battery 20, the size of the end side portions 212 is smaller than the size of the middle portion 211, that is, the overall volume of the main body 21 is shrunk at its two end side portions 212, thereby reducing the overall volume of the main body 21.

[0023] Considering the need to balance the current capacity of the pole assembly 22, the energy density of the single battery 20, and the creepage distance between electrical parts, the height of the pole assembly 22 cannot be too small, but it cannot be too large. Therefore, in general, the height of the pole assembly 22 can be less than the thickness of the main body 21, which will result in a large gap between the pole assembly 22 and the battery shell in the height direction. These gaps will be filled with electrolyte, which requires a high electrolyte injection volume, otherwise local lithium precipitation is likely to occur. A high injection volume will increase costs. Therefore, by making the size of the end side portion 212 smaller than the size of the middle portion 211 along the width direction of the single battery 20, the waste of this part of space can be reduced and the injection coefficient can be reduced.

[0024] The pole assembly 22 is arranged on the end side part 212, and the orthographic projections of the pole assembly 22 and the heat exchange pipeline 13 on the same plane coincide with each other, which can shorten the heat transfer path from the pole assembly 22 to the heat exchange pipeline 13, quickly reduce the temperature of the pole assembly 22, and ensure the normal use of the single battery 20.

[0025] Along the arrangement direction of the end side portion 212 and the heat exchange pipeline 13, the positive projections of the pole assembly 22 and the heat exchange pipeline 13 on the same plane coincide with each other, that is, the heat exchange pipeline 13 can be set at the top end of the single cell 20, or the heat exchange pipeline 13 can be set at the bottom end of the single cell 20, or the heat exchange pipeline 13 can be set at the side end of the single cell 20, thereby ensuring that the heat exchange pipeline 13 realizes heat exchange protection for the end side portion 212, and then realizes rapid heat dissipation of the pole assembly 22.

[0026] Combination Figure 3 As shown, the heat exchange pipeline 13 is formed with a heat exchange channel 11, and a cooling medium may be arranged in the heat exchange channel 11, for example, a fluid or a fixed phase change material, etc. The cooling medium in the heat exchange channel 11 may circulate, and the pole assembly 22 and the heat exchange channel 11 are arranged opposite to each other, thereby effectively improving the heat dissipation capacity of the pole assembly 22.

[0027] The heat exchange pipeline 13 is formed with a heat exchange channel 11, that is, the pole assembly 22 and the heat exchange pipeline 13 are arranged opposite each other. At this time, the heat exchange pipeline 13 can utilize the space formed by the contraction of the end side part 212, which is beneficial to the setting of the heat exchange pipeline 13 and can facilitate the rapid heat dissipation of the pole assembly 22 by the heat exchange channel 11.

[0028] Combination Figure 1 As shown, the end side portion 212 is in contact with the heat exchange pipeline 13. The end side portion 212 and the heat exchange pipeline 13 may be in direct contact, or the end side portion 212 and the heat exchange pipeline 13 may be in indirect contact. There is no limitation here, as long as it is ensured that the heat exchange pipeline 13 can form heat exchange protection for the end side portion 212.

[0029] In one embodiment, Figure 1 and Figure 3 As shown, the heat exchange pipeline 13 is located below the single cell 20 to support the end side portion 212, that is, the heat exchange pipeline 13 can form a support for the single cell 20, which can not only realize heat exchange protection for the single cell 20, but also form a support for the single cell 20, thereby improving the safety performance of the single cell 20.

[0030] In one embodiment, Figure 4 As shown, the main body 21 includes two opposite large surfaces 213 and side surfaces 214 arranged around the large surfaces 213. The pole assembly 22 is arranged on the large surfaces 213, so that the main body 21 can provide a reliable supporting surface for the pole assembly 22, which is beneficial to the installation efficiency and stability performance of the pole assembly 22, and can also facilitate the installation of the pole assembly 22.

[0031] In one embodiment, there are multiple single cells 20, and the large surfaces 213 of two adjacent single cells 20 are arranged relative to each other so that the stacking direction of the multiple single cells 20 is perpendicular to the large surface 213, thereby facilitating the stacking of the single cells 20, improving the assembly efficiency of the battery device, and reliably improving the space utilization of the battery device.

[0032] Combination Figure 3 As shown, the large surfaces 213 of two adjacent single batteries 20 are arranged opposite to each other, and the single batteries 20 are arranged on the bottom heat exchange structure 10 .

[0033] The battery device further includes a main board 12, which contacts the middle portion 211. The main board 12 is formed with a heat exchange pipeline 13, that is, the heat exchange pipeline 13 belongs to the main board 12. For example, a protruding structure is formed by stamping the main board 12, and the protruding structure can be used as the heat exchange pipeline 13. Figure 1 shown.

[0034] Alternatively, the heat exchange pipeline 13 is independently arranged relative to the main board 12, and the heat exchange pipeline 13 is connected to the main board 12, that is, the heat exchange pipeline 13 and the main board 12 can be independently formed structures, and the heat exchange pipeline 13 can be connected to the main board 12, and the main board 12 forms a support for the heat exchange pipeline 13, thereby improving the stability performance of the heat exchange pipeline 13.

[0035] It should be noted that, combined with Figure 1 As shown, the heat exchange pipeline 13 and the main board 12 can form a bottom heat exchange structure 10, and the single battery 20 is arranged on the bottom heat exchange structure 10, so that the bottom heat exchange structure 10 can form a reliable support and protection for the single battery 20. A heat exchange flow channel can also be formed in the main board 12.

[0036] In one embodiment, the main board 12 is bonded to the middle part 211, and the heat exchange pipe 13 is protruded relative to the main board 12 in the direction toward the single cell 20. This not only ensures a reliable fixed connection between the single cell 20 and the middle part 211, but also the heat exchange pipe 13 can support the end side part 212 of the single cell 20, and can control the thickness of the glue layer between each single cell 20 in the battery device and the main board 12, improve consistency, reduce stress concentration, and thereby improve the safe use performance of the battery device.

[0037] The heat exchange pipeline 13 is arranged to protrude relative to the main board 12 in the direction toward the single battery 20, thereby ensuring the contact between the heat exchange pipeline 13 and the end side part 212, that is, the heat exchange pipeline 13 can make full use of the space saved by the end side part 212, and the glue layer between the main board 12 and the middle part 211 can ensure the reliable fixed connection between the main board 12 and the middle part 211.

[0038] In one embodiment, along the width direction of the single cell 20, the end side portion 212 is connected to the middle of the middle portion 211, that is, the upper and lower sides of the end side portion 212 can form a relatively large space between the battery box, thereby providing a reliable storage space for other structures, thereby improving the space utilization of the battery device.

[0039] Along the width direction of the single battery 20 , the end portion 212 is connected to the middle of the middle portion 211 , that is, the upper and lower ends of the end portion 212 are spaced a certain distance from the upper and lower ends of the middle portion 211 .

[0040] In one embodiment, along the width direction of the single cell 20, the minimum vertical distance between the opposite sides of the end side portion 212 and the opposite sides of the middle portion 211 is consistent, which not only facilitates the molding of the single cell 20, but also plays a fool-proof role during assembly, avoiding upper and lower assembly errors, thereby improving the assembly efficiency of the battery device.

[0041] Along the width direction of the single cell 20, the minimum vertical distance between the opposite sides of the end side portion 212 is consistent with the opposite sides of the middle portion 211, that is, along the width direction of the single cell 20, the vertical distance between the opposite sides of the end side portion 212 is consistent with the opposite sides close to the middle portion 211, that is, the end side portion 212 has a first top end and a first bottom end, and the middle portion 211 has a second top end and a second bottom end, and the vertical distance between the first top end and the second top end can be basically equal to the vertical distance between the first bottom end and the second bottom end.

[0042] In one embodiment, there are multiple single cells 20, and the extension direction of at least part of the heat exchange pipeline 13 is parallel to the stacking direction of the multiple single cells 20, so that the heat exchange pipeline 13 can simultaneously form heat exchange protection for multiple pole assemblies 22, thereby improving the safe use performance of the battery device.

[0043] In one embodiment, the heat exchange pipeline 13 can be a pipeline, which can be arranged below the single battery 20 and can be arranged opposite to the pole assembly 22. The pipeline can be arranged in a serpentine shape to ensure heat exchange protection for the single battery 20.

[0044] In one embodiment, the battery device also includes a battery case 30, and the heat exchange pipeline 13 and the single battery 20 are both arranged in the battery case 30. The heat exchange pipeline 13 is fixedly connected to the battery case 30. The battery case 30 protects the heat exchange pipeline 13 and the single battery 20, and can form an installation position for the single battery 20 through the heat exchange pipeline 13, thereby improving the battery grouping efficiency.

[0045] The battery box 30 may include a frame, a bottom plate and a top cover, and the heat exchange pipe 13 and the main board 12 may form a bottom heat exchange structure 10. The bottom plate may be formed by the bottom heat exchange structure 10, or the bottom heat exchange structure 10 may be disposed on the bottom plate, thereby achieving cooling of the single battery 20.

[0046] In one embodiment, the single cell 20 further includes at least one weak portion 23, which is disposed on the main body 21; wherein, at least one weak portion 23 is disposed on a side of the main body 21 facing the heat exchange pipeline 13, thereby reducing the probability of gas impacting the vehicle passenger compartment after the weak portion 23 explodes, thereby improving the safety performance of the battery device.

[0047] Combination Figure 4 As shown, the weak portion 23 is disposed on the main body 21, and the weak portion 23 can be disposed on the side surface 214 of the main body 21, so that the weak portion 23 can be disposed toward the bottom heat exchange structure 10. The weak portion 23 can be integrally formed with the battery housing of the single battery 20, or the weak portion 23 can be separately formed with the battery housing of the single battery 20, which is not limited here.

[0048] In one embodiment, along the width direction of the single cell 20, the weak portion 23 and the orthographic projections of the heat exchange pipeline 13 on the same plane coincide with each other, that is, the weak portion 23 and the heat exchange pipeline 13 can be arranged opposite each other. When the single cell 20 thermally runs away and releases pressure, the weak portion 23 bursts, and the heat exchange pipeline 13 can cool the high-temperature material. It is not ruled out that the heat exchange pipeline 13 is melted by the high-temperature material to release the cooling medium, thereby forming a rapid heat dissipation for the single cell 20, avoiding safety problems of the battery device.

[0049] In one embodiment, Figure 1 As shown, the single cell 20 also includes an isolation member 24, which is arranged on the main body 21, and at least a portion of the isolation member 24 is located on the end side portion 212; wherein, at least a portion of the isolation member 24 is located between the end side portion 212 and the heat exchange pipeline 13, thereby enabling the isolation member 24 to not only form a reliable support and protection for the single cell 20 and provide a certain buffering capacity, but also reduce the risk of impacting and deforming the heat exchange pipeline 13 when the battery device vibrates, thereby effectively improving the safety performance of the battery device.

[0050] At least part of the isolation member 24 is located between the end side portion 212 and the heat exchange pipeline 13, which can not only protect the heat exchange pipeline 13 from being deformed by impact and reducing the heat exchange flow, but also conveniently protect the weak portion 23 of the single battery 20, avoiding the weak portion 23 from being hit and opening the valve during normal use, thereby forming reliable protection for the battery device.

[0051] In one embodiment, the isolation member 24 is an insulating bracket, which can not only protect the single cell 20, but also reduce the risk of short circuit between the single cell 20 and the battery box 30, thereby improving the safe use performance of the battery device.

[0052] The insulating bracket may be a plastic bracket, or the insulating bracket may be a rubber bracket or the like.

[0053] It should be noted that a single cell includes a battery cell and an electrolyte, which is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A battery cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion includes a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged.

[0054] In one embodiment, the single cell 20 may be a quadrangular prism-shaped battery. A quadrangular prism-shaped battery mainly refers to a battery having a prism-shaped appearance, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.

[0055] The battery cell can be a laminated battery cell, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first electrode sheet stacked on top of each other, a second electrode sheet with electrical properties opposite to the first electrode sheet, and a diaphragm sheet arranged between the first electrode sheet and the second electrode sheet, so that multiple pairs of first electrode sheets and second electrode sheets are stacked to form a laminated battery cell.

[0056] Alternatively, the battery cell may be a wound battery cell, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

[0057] In one embodiment, the battery device is a battery module or a battery pack.

[0058] The battery module includes a plurality of single batteries 20 . The battery module may further include end plates and side plates. The end plates and side plates are used to fix the plurality of single batteries 20 .

[0059] It should be noted that multiple single cells 20 can be formed into a battery module and then arranged in the battery box 30, and multiple single cells 20 can be fixed by end plates and side plates. Multiple single cells 20 can be directly arranged in the battery box 30, that is, there is no need to group multiple single cells 20, in which case the end plates and side plates can be removed.

[0060] Those skilled in the art will readily come up with other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. The present disclosure is intended to cover any variation, use or adaptation of the present utility model, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and example embodiments are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0061] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from its scope. The scope of protection of the present disclosure is limited only by the appended claims.

Claims

1. A battery device, characterized in that: include: A heat exchange pipeline (13) and a single cell (20), wherein the heat exchange pipeline (13) is formed with a heat exchange channel (11), and the single cell (20) comprises a main body (21) and a pole assembly (22), wherein the main body (21) comprises a middle portion (211) and two end portions (212), wherein along the length direction of the single cell (20), the two end portions (212) are respectively connected to opposite ends of the middle portion (211), and along the width direction of the single cell (20), the size of the end portion (212) is smaller than the size of the middle portion (211); The pole assembly (22) is arranged on the end side portion (212), the end side portion (212) is in contact with the heat exchange pipeline (13), and along the arrangement direction of the end side portion (212) and the heat exchange pipeline (13), the orthographic projections of the pole assembly (22) and the heat exchange pipeline (13) on the same plane overlap.

2. The battery device according to claim 1, characterized in that: The heat exchange pipeline (13) is located below the single battery (20) to support the end side portion (212).

3. The battery device according to claim 1 or 2, characterized in that: The main body (21) comprises two opposite large surfaces (213) and side surfaces (214) arranged around the large surfaces (213), and the pole assembly (22) is arranged on the large surfaces (213).

4. The battery device according to claim 3, characterized in that: There are a plurality of single cells (20), and the large surfaces (213) of two adjacent single cells (20) are arranged opposite to each other, so that the stacking direction of the plurality of single cells (20) is perpendicular to the large surface (213); The battery device further comprises a main board (12), the main board (12) is in contact with the middle part (211), the main board (12) is formed with the heat exchange pipeline (13), or the heat exchange pipeline (13) is independently arranged relative to the main board (12), and the heat exchange pipeline (13) is connected to the main board (12).

5. The battery device according to claim 4, characterized in that: The main board (12) is bonded to the middle portion (211), and the heat exchange pipeline (13) is arranged to protrude relative to the main board (12) in a direction toward the single battery (20).

6. The battery device according to claim 1 or 2, characterized in that: Along the width direction of the single battery (20), the end side portion (212) is connected to the middle portion of the middle portion (211).

7. The battery device according to claim 6, characterized in that: Along the width direction of the single battery (20), the minimum vertical distance between the opposite sides of the end side portion (212) and the opposite sides of the middle portion (211) is consistent.

8. The battery device according to claim 1 or 2, characterized in that: There are a plurality of single cells (20), and the extension direction of at least a portion of the heat exchange pipeline (13) is parallel to the stacking direction of the plurality of single cells (20).

9. The battery device according to claim 1 or 2, characterized in that: The battery device further comprises a battery box (30), the heat exchange pipeline (13) and the single battery (20) are both arranged in the battery box (30), and the heat exchange pipeline (13) is fixedly connected to the battery box (30).

10. The battery device according to claim 1 or 2, characterized in that: The single battery (20) further comprises at least one weak portion (23), wherein the weak portion (23) is arranged on the main body (21); Wherein, at least one of the weak portions (23) is arranged on a side of the main body (21) facing the heat exchange pipeline (13).

11. The battery device according to claim 10, characterized in that: Along the width direction of the single battery (20), the orthographic projections of the weak portion (23) and the heat exchange pipeline (13) on the same plane overlap.

12. The battery device according to claim 1 or 2, characterized in that: The single battery (20) further comprises an isolating member (24), wherein the isolating member (24) is arranged on the main body (21), and at least a portion of the isolating member (24) is located on the end side portion (212); Wherein, at least a portion of the isolation element (24) is located between the end side portion (212) and the heat exchange pipeline (13).

13. The battery device according to claim 12, characterized in that: The isolating member (24) is an insulating bracket.

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