Battery pack

Abstract

The utility model belongs to the technical field of power batteries, and discloses a battery pack. The battery pack comprises a bottom supporting piece, a liquid cooling plate, a battery cell assembly and an adhesive layer, wherein the liquid cooling plate is stacked above the bottom supporting piece; the battery cell assembly is arranged above the liquid cooling plate, and the liquid cooling plate is used for cooling the battery cell assembly; the glue layer is laid on the liquid cooling plate, the glue layer is used for bonding and fixing the battery cell assembly and the liquid cooling plate, and the viscosity of the glue layer is 30000-80000 mPa.s. The leveling property of the adhesive layer is improved by adopting the adhesive layer with lower viscosity, so that the thickness of the adhesive layer can be reduced, the curing speed is accelerated, the production takt is accelerated, and the production cost is reduced.

Description

Technical Field

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

[0002] Traditional electric vehicle battery packs utilize MTP (Module-to-Pack) technology, where cells are assembled into modules, which are then installed in a battery pack, forming a three-stage assembly model: cell-module-pack. CTP (Cell-to-Pack) battery packs, on the other hand, bypass the standardized module stage and integrate cells directly into the pack, eliminating the intermediate module. This significantly improves the battery pack's space efficiency and energy density, leading to widespread adoption.

[0003] Currently, CTP battery packs eliminate module fixing bolts. Module fixation relies entirely on adhesive bonding between the battery cells and the liquid cooling plate, ensuring the module's mechanical reliability. To ensure the liquid cooling plate's cooling effect on the battery cells, the glue has a high thermal conductivity, resulting in high viscosity. To ensure leveling, the glue layer is thick, making it difficult to press open and costly. The glue also cures slowly, often requiring six hours of stabilization to reach handling strength (0.5 MPa). Otherwise, heating and curing are required, further increasing costs. Utility Model Content

[0004] The purpose of the utility model is to provide a battery pack that can solve the problems of high cost and long curing time caused by the high viscosity of the existing glue layer.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A battery pack, comprising:

[0007] bottom support member;

[0008] a liquid cooling plate, the liquid cooling plate being stacked above the bottom support member;

[0009] A battery cell assembly, wherein the battery cell assembly is arranged above the liquid cooling plate, and the liquid cooling plate is used to cool the battery cell assembly;

[0010] An adhesive layer is laid on the liquid cooling plate, and the adhesive layer is used to bond and fix the battery core assembly and the liquid cooling plate. The viscosity of the adhesive layer is 30,000-80,000 mPa·s.

[0011] As an optional solution to the above battery pack, the thermal conductivity of the adhesive layer is 0.3-0.8w / m·k;

[0012] And / or, the thickness of the adhesive layer is 0.5-1 mm.

[0013] As an optional solution for the above-mentioned battery pack, the battery cell assembly includes a plurality of battery cells arranged at intervals, and a glue overflow gap is formed between at least two adjacent battery cells. The glue forming the glue layer can overflow upward from the glue overflow gap to form a glue overflow portion, and the glue overflow portion bonds the adjacent battery cells.

[0014] As an optional solution of the above-mentioned battery pack, the plurality of battery cells are arranged in a matrix, and the glue overflow portion is provided between four adjacent battery cells.

[0015] As an optional solution to the above battery pack, the height of the glue overflow portion is 50%-80% of the height of the battery cell;

[0016] And / or, the height of the glue overflow portion is 50-90 mm.

[0017] As an optional solution of the above battery pack, the circumferential side wall of the battery cell includes two oppositely disposed first surfaces and two oppositely disposed second surfaces, and the area of ​​the first surface is larger than the area of ​​the second surface;

[0018] An insulating member is provided between two opposite second surfaces, the insulating member being used for insulating and connecting the two opposite second surfaces, and two adjacent insulating members are spaced apart to form the glue overflow gap;

[0019] And / or, two opposite first surfaces are provided with a rubber stopper, and the rubber stopper is used to prevent the rubber material forming the rubber layer from entering between the two opposite first surfaces.

[0020] As an optional solution of the above-mentioned battery pack, along the arrangement direction of the two first surfaces and / or second surfaces in the same battery cell, the size of the glue overflow gap is 0.5-1 mm.

[0021] As an optional solution for the above-mentioned battery pack, the height of the rubber stopper is 5-10 mm.

[0022] As an optional solution of the above battery pack, a buffer layer is provided between the liquid cooling plate and the bottom support member.

[0023] As an optional solution to the above battery pack, the buffer layer is a foam buffer layer;

[0024] And / or, the thickness of the buffer layer is 1-3 mm;

[0025] And / or, the thermal conductivity of the buffer layer is 0.04-0.1 w / m·k.

[0026] Beneficial effects of the utility model:

[0027] In the battery pack provided by this invention, the adhesive layer bonding the liquid cooling plate and the battery cell assembly has a viscosity of 30,000-80,000 mPa·s. By using an adhesive layer with a lower viscosity, the leveling properties of the adhesive layer are improved, which allows for a thinner adhesive layer and accelerates curing, thus speeding up production cycles and reducing production costs.

[0028] Since the viscosity of the glue layer is low, the glue layer can form a glue overflow portion between the gaps of adjacent battery cells during pressure maintenance. The glue overflow portion bonds the adjacent battery cells, which is beneficial to improving the overall strength of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a cross-sectional view of a portion of the structure of the battery pack provided by the present invention;

[0030] Figure 2 It is a top view of a partial structure of the battery pack provided by the present invention.

[0031] In the picture:

[0032] 10. Bottom support member; 20. Liquid cooling plate; 30. Battery cell assembly; 31. Battery cell; 311. First surface; 312. Second surface; 40. Glue layer; 50. Glue stopper; 60. Buffer layer; 70. Insulator; 80. Glue overflow gap. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0034] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0037] This embodiment provides a battery pack, such as Figure 1 As shown, including from bottom to top ( Figure 1 The bottom support member 10, liquid cooling plate 20, adhesive layer 40, and battery cell assembly 30 are sequentially arranged (in the middle Z direction). The liquid cooling plate 20 is stacked on the bottom support member 10, supporting the liquid cooling plate 20 and the battery cell assembly 30 thereon. The adhesive layer 40 is laid on the liquid cooling plate 20 to bond and secure the battery cell assembly 30 to the liquid cooling plate 20. A heat exchange medium flows through the liquid cooling plate 20, exchanging heat with the battery cell assembly 30 to control the operating temperature of the battery cell assembly 30 and prevent overheating and thermal runaway of the battery pack.

[0038] The adhesive layer 40 is formed by curing an adhesive. Optionally, the adhesive may be glue.

[0039] By fixing the battery cell assembly 30 and the liquid cooling plate 20 with the adhesive layer 40 , fasteners such as bolts can be omitted, and the space required for fixing the liquid cooling plate 20 and the battery cell assembly 30 can be reduced, thereby reducing costs and simplifying the structure.

[0040] It should be noted here that the liquid cooling plate 20 is a conventional technology in this field, and the structure of the liquid cooling plate 20 and its cooling principle are both existing technologies and will not be described in detail here.

[0041] Since the heat generated by the battery cell assembly 30 during operation needs to be transferred to the liquid cooling plate 20 through the adhesive layer 40, the prior art uses thermal conductivity as an important parameter of the adhesive layer 40. Generally, an adhesive with a high thermal conductivity is selected to form the adhesive layer 40. The thermal conductivity of the adhesive layer 40 is generally 1.3-2w / m·k, thereby ensuring the temperature control effect of the battery cell assembly 30. However, the high thermal conductivity will lead to a high viscosity of the adhesive layer 40, generally 150,000-300,000mPa·s. It is understandable that an adhesive with high viscosity has poor fluidity and is difficult to level when applied to the liquid cooling plate 20. It is generally necessary to flatten the adhesive, which is difficult. In addition, the thickness of the adhesive cannot be too thin, generally 1.5-2mm. This results in a slow curing speed of the adhesive and a long pressure holding time, which greatly reduces the production cycle and equipment utilization of the production line. At the same time, a large number of pressure holding tooling and logistics vehicles are required, which increases production costs.

[0042] To address the above issues, in this embodiment, the viscosity of the adhesive layer 40 is 30,000-80,000 mPa·s. By using an adhesive layer 40 with a lower viscosity, the leveling properties of the adhesive layer 40 are improved, thereby reducing the thickness of the adhesive layer 40 and accelerating the curing speed, which helps speed up production cycles and reduce production costs.

[0043] For example, the viscosity of the adhesive layer 40 may be 35,000 mPa·s, 40,000 mPa·s, 45,000 mPa·s, 50,000 mPa·s, 55,000 mPa·s, 60,000 mPa·s, 65,000 mPa·s, 70,000 mPa·s, or 75,000 mPa.

[0044] It can be understood that although selecting a glue layer 40 with a lower viscosity will result in a decrease in the thermal conductivity of the glue layer 40, due to the low viscosity of the glue layer 40, the thickness of the glue layer 40 will be correspondingly reduced, which can compensate for the impact of the decrease in thermal conductivity on the heat exchange effect between the battery cell assembly 30 and the liquid cooling plate 20, thereby ensuring the temperature control effect of the battery cell assembly 30.

[0045] To shorten the curing time of the adhesive layer 40, reduce costs, and improve heat dissipation, in some embodiments, the thickness of the adhesive layer 40 is 0.5-1 mm. By selecting an adhesive layer 40 with a lower viscosity, the thickness of the adhesive layer 40 can be reduced to 0.25-0.67 times the thickness of the existing adhesive layer 40, reducing the amount of adhesive used. This not only reduces costs and improves heat dissipation, but also significantly shortens the curing time of the adhesive layer 40, thereby speeding up production cycles.

[0046] Illustratively, the thickness of the adhesive layer 40 may be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, or 1 mm.

[0047] In some embodiments, the thermal conductivity of the adhesive layer 40 is 0.3-0.8 w / m·k to ensure that the liquid cooling plate 20 can control the temperature of the battery cell assembly 30. For example, the thermal conductivity of the adhesive layer 40 can be 0.3 w / m·k, 0.35 w / m·k, 0.4 w / m·k, 0.45 w / m·k, 0.5 w / m·k, 0.55 w / m·k, 0.6 w / m·k, 0.65 w / m·k, 0.7 w / m·k, 0.75 w / m·k, or 0.8 w / m·k.

[0048] The adhesive layer 40 with the above parameters has a very fast curing speed. Within 1 hour of applying the glue, the curing strength at room temperature can reach 0.5-1Mpa. The pressure holding time after applying the glue can be 5-20 minutes. Compared with the existing technology, the pressure holding time can be shortened from 2 hours to 5 minutes, which greatly shortens the pressure holding time, speeds up the production cycle, and reduces the production cost. The cost of a single package of glue can be reduced by 30%-50%.

[0049] Since the viscosity of the glue layer 40 is low, the glue layer 40 is easy to overflow during pressure maintenance. In order to improve the strength of the battery, in some embodiments, the battery cell assembly 30 includes a plurality of battery cells 31 arranged at intervals. The glue layer 40 can overflow from the gaps between adjacent battery cells 31 during the pressure maintenance process, thereby solidifying into overflow glue portions between adjacent battery cells 31. The overflow glue portions can bond adjacent battery cells 31 to improve the overall strength and stability of the battery pack.

[0050] In some embodiments, as Figure 1 and Figure 2 As shown, multiple battery cells 31 are arranged in a matrix, and the overflow portion can be formed between the gaps enclosed by four adjacent battery cells 31. It is understood that the battery cells 31 generate heat and expand during operation. To prevent the overflow portion from interfering with the expansion of the battery cells 31 and affecting the cycle performance of the battery cells 31, the overflow portion is positioned between the gaps enclosed by four adjacent battery cells 31. This can increase the overall strength of the battery pack while reducing the impact on the expansion of the battery cells 31, thereby improving the cycle performance of the battery cells 31.

[0051] In other embodiments, the glue overflow portion may also be provided at other locations, as long as it can bond adjacent battery cells 31 and improve the overall strength of the battery pack.

[0052] Specifically, the multiple battery cells 31 are arranged in at least two rows, each row including at least two battery cells 31 arranged along the X direction, and at least two rows of battery cells 31 arranged along the Y direction. The multiple battery cells 31 are arranged in a matrix, which can fully utilize the space within the battery pack and thus improve the energy density.

[0053] To improve the overall strength of the battery pack, in some embodiments, the height of the glue overflow portion (i.e., the dimension along the Z direction) can be 50%-80% of the height of the battery cell 31 to increase the contact area between the battery cell 31 and the glue overflow portion, thereby improving the overall strength.

[0054] Exemplarily, typical non-limiting data of the ratio of the height of the glue overflow portion to the height of the battery cell 31 are 50%, 55%, 60%, 65%, 70%, 75%, and 80%.

[0055] In some embodiments, the height of the overflow portion can be 50-90 mm. Within this range, the contact area between the overflow portion and the battery cell 31 is large, and the overall strength of the battery pack is improved. The height of the overflow portion is not too high, thereby reducing the difficulty of forming the overflow portion during the pressure holding process.

[0056] For example, typical non-limiting data for the height of the glue overflow portion are 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, and 90 mm.

[0057] In some embodiments, the battery cell 31 is generally rectangular, and the circumferential sidewalls of the battery cell 31 include two first surfaces 311 disposed opposite each other along the X direction and two second surfaces 312 disposed opposite each other along the Y direction. The first surfaces 311 and the second surfaces 312 are disposed adjacent to each other, and the area of ​​the first surface 311 is larger than the area of ​​the second surface 312. In other words, the dimension of the first surface 311 along the Y direction is larger than the dimension of the second surface 312 along the X direction. The first surface 311 is the larger surface of the battery cell 31, and the second surface 312 is the narrower surface of the battery cell 31.

[0058] It is understood that when the battery cell 31 is in operation, the first surface 311 is the primary expansion surface. To prevent the adhesive layer 40 from overflowing between two adjacent first surfaces 311 during pressure maintenance, thereby affecting the expansion of the battery cell 31, a rubber stopper 50 is provided between two opposing first surfaces 311. The rubber stopper 50 prevents the glue from overflowing upward from the adhesive layer 40 during pressure maintenance, thereby preventing the glue from overflowing onto the first surface 311 of the battery cell 31, preventing the glue from affecting the expansion of the battery cell 31 and thus preventing the cycling performance of the battery cell 31.

[0059] In some embodiments, the rubber blocking member 50 is made of an elastic material and can be compressed between two opposite first surfaces 311 . The gap between the two first surfaces 311 is sealed by the compression deformation of the rubber blocking member 50 to prevent glue from overflowing between the first surfaces 311 of the battery cell 31 .

[0060] Optionally, the rubber stopper 50 may be made of elastic materials such as foam, silicone, etc.

[0061] In some embodiments, the glue blocking member 50 may be in an elongated shape, with a length matching the dimension of the first surface 311 along the Y direction. The glue blocking member 50 may be disposed at the bottom of the first surface 311 to prevent glue from overflowing upward to the first surface 311 .

[0062] To prevent the adhesive stopper 50 from affecting the expansion of the first surface 311, in some embodiments, the height H of the adhesive stopper 50 may be 5-10 mm. Within this range, the adhesive stopper 50 can effectively prevent adhesive from overflowing onto the first surface 311 while minimizing obstruction to the first surface 311, thereby minimizing the impact on the expansion of the first surface 311.

[0063] Exemplarily, typical non-limiting data of the height H of the rubber stopper 50 are 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, and 10 mm.

[0064] In other embodiments, the rubber blocking member 50 can be roughly U-shaped, and the rubber blocking member 50 includes a horizontal bar and vertical bars respectively connected to the two ends of the horizontal bar. The horizontal bar is located at the bottom end of the first surface 311, and the vertical bars are located on both sides of the first surface 311. It can effectively prevent the glue from contacting the first surface 311, thereby avoiding interference with the first surface 311 and collision, and ensuring the cycle performance of the battery cell 31.

[0065] In some embodiments, the adhesive stopper 50 can be bonded and fixed to two adjacent battery cells 31 to simplify the fixing structure and reduce the space occupied by the adhesive stopper 50. Optionally, the adhesive stopper 50 can have adhesive backings on both opposite sides of the adhesive stopper 50, and the adhesive stopper 50 can be bonded and fixed to the first surfaces 311 of the two adjacent battery cells 31 via the adhesive backings.

[0066] To prevent short circuits between adjacent battery cells 31, in some embodiments, an insulating member 70 made of an insulating material is disposed between two opposing second surfaces 312. The insulating member 70 insulates the second surfaces 312 of two adjacent battery cells 31, preventing short circuits between the battery cells 31 and thereby ensuring the reliability of the battery pack.

[0067] Optionally, the insulating member 70 may be made of plastic or insulating foam.

[0068] In order to form the glue overflow gap 80, in some embodiments, two adjacent insulating members 70 are spaced apart to form the glue overflow gap 80. Figure 2 As shown, the glue overflow gap 80 is located between two adjacent insulating parts 70 along the X direction and between two adjacent glue blocking parts 50 along the Y direction, thereby preventing glue from overflowing to the first surface 311 and the second surface 312 of the battery cell 31. A glue overflow portion can be formed between the edges and corners of four adjacent battery cells 31, and the overall strength of the battery pack is improved by bonding the glue overflow portion to the edges and corners of the battery cell 31.

[0069] To enhance the effect of the overflow glue portion on improving the battery pack's strength, the dimension L of the overflow glue gap 80 along the alignment direction of the two second surfaces 312 of the same battery cell 31 is 0.5-1 mm. Within this range, the overflow glue portion can effectively cover the corners of the battery cell 31, thereby improving the battery pack's strength, while also reducing the area occupied by the overflow glue portion on the first surface 311, thereby preventing expansion of the battery cell 31.

[0070] For example, typical non-limiting data of the dimension L of the overflow gap 80 are 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, and 1 mm.

[0071] Correspondingly, along the arrangement direction of the two first surfaces 311 of the same battery cell 31, the size of the overflow gap 80 is 0.5-1 mm. Within this range, the overflow glue portion can effectively cover the corners of the battery cell 31, thereby improving the strength of the battery pack, while also reducing the area occupied by the overflow glue portion on the second surface 312, thereby preventing the expansion of the battery cell 31 from being affected.

[0072] Due to the demand for weight reduction and low cost of the battery pack, the thickness of the liquid cooling plate 20 is getting thinner and thinner, resulting in a significant decrease in the mechanical strength of the liquid cooling plate 20. The liquid cooling plate 20 is located between the battery cell assembly 30 and the bottom support 10. The liquid cooling plate 20 directly bears the weight of the battery cell assembly 30, which increases the deformation of the liquid cooling plate 20 during the pressure holding process. Reducing the deformation of the liquid cooling plate 20 by increasing the thickness of the glue layer 40 will not only greatly increase the cost, but also affect the heat transfer effect between the liquid cooling plate 20 and the battery cell assembly 30.

[0073] To address the above issues, in some embodiments, a buffer layer 60 is provided between the liquid cooling plate 20 and the bottom support member 10. The buffer layer 60 can absorb the pressure exerted on the liquid cooling plate 20, thereby reducing deformation of the liquid cooling plate 20. This eliminates the need to increase the thickness of the adhesive layer 40, thereby saving costs and shortening the holding time.

[0074] In some embodiments, the buffer layer 60 is a foam buffer layer 60. The foam buffer layer 60 can not only reduce the deformation of the liquid cooling plate 20, but also improve the thermal insulation performance of the battery pack, reduce the mutual influence between the temperature of the battery pack and the ambient temperature, and thus help maintain the stability of the battery pack.

[0075] Optionally, the thermal conductivity of the buffer layer 60 is 0.04-0.1 W / m·K to improve the thermal insulation performance of the battery pack. For example, typical non-limiting data of the thermal conductivity of the buffer layer 60 are 0.04 W / m·K, 0.05 W / m·K, 0.06 W / m·K, 0.07 W / m·K, 0.08 W / m·K, 0.09 W / m·K, and 1 W / m·K.

[0076] In some embodiments, the buffer layer 60 can be a contoured layer so that the shape of the surface of the buffer layer 60 in contact with the liquid cooling plate 20 is adapted to the liquid cooling plate 20, and the shape of the surface of the buffer layer 60 in contact with the bottom support member 10 is adapted to the bottom support member 10, which is beneficial to buffering the pressure and reducing the deformation of the liquid cooling plate 20.

[0077] In some embodiments, the thickness d of the buffer layer 60 is 1-3 mm. When the thickness d of the buffer layer 60 is within the above range, the amount of material used can be reduced while ensuring the buffering effect on the liquid cooling plate 20, thereby reducing costs.

[0078] Exemplarily, typical non-limiting data of the thickness d of the buffer layer 60 are 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.8 mm, and 3 mm.

[0079] In some embodiments, the battery pack includes a box body, the bottom support member 10 may be a bottom guard plate of the box body, and the battery cell assembly 30 and the liquid cooling plate 20 are both placed in the box body to improve the modularity of the battery pack.

[0080] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery pack, characterized in that: include: bottom support member (10); a liquid cooling plate (20), the liquid cooling plate (20) being stacked above the bottom support member (10); A battery cell assembly (30), the battery cell assembly (30) being arranged above the liquid cooling plate (20), the liquid cooling plate (20) being used to cool the battery cell assembly (30); A glue layer (40) is laid on the liquid cooling plate (20), the glue layer (40) adhesively fixes the battery core assembly (30) and the liquid cooling plate (20), and the viscosity of the glue layer (40) is 30,000-80,000 mPa·s.

2. The battery pack according to claim 1, wherein: The thermal conductivity of the adhesive layer (40) is 0.3-0.8w / m·k; And / or, the thickness of the adhesive layer (40) is 0.5-1 mm.

3. The battery pack according to claim 1, wherein: The battery cell assembly (30) comprises a plurality of battery cells (31) arranged at intervals, wherein a glue overflow gap (80) is formed between at least two adjacent battery cells (31), and the glue forming the glue layer (40) can overflow upward from the glue overflow gap (80) to form a glue overflow portion, and the glue overflow portion is bonded to the adjacent battery cells (31).

4. The battery pack according to claim 3, characterized in that: The plurality of battery cells (31) are arranged in a matrix, and the glue overflow portion is provided between four adjacent battery cells (31).

5. The battery pack according to claim 3, wherein: The height of the glue overflow portion is 50%-80% of the height of the battery core (31); And / or, the height of the glue overflow portion is 50-90 mm.

6. The battery pack according to claim 3, characterized in that: The circumferential side wall of the battery core (31) comprises two first surfaces (311) and two second surfaces (312) disposed opposite to each other, and the area of ​​the first surface (311) is greater than the area of ​​the second surface (312); An insulating member (70) is provided between two opposite second surfaces (312), the insulating member (70) being used for insulating and connecting the two opposite second surfaces (312), and two adjacent insulating members (70) being spaced apart to form the glue overflow gap (80); And / or, the two opposite first surfaces (311) are provided with a rubber blocking member (50), and the rubber blocking member (50) is used to block the rubber material forming the rubber layer (40) from entering between the two opposite first surfaces (311).

7. The battery pack according to claim 6, characterized in that: Along the arrangement direction of the two first surfaces (311) and / or second surfaces (312) in the same battery cell (31), the size of the glue overflow gap (80) is 0.5-1 mm.

8. The battery pack according to claim 6, wherein: The height of the rubber blocking member (50) is 5-10 mm.

9. The battery pack according to any one of claims 1 to 5, characterized in that: A buffer layer (60) is provided between the liquid cooling plate (20) and the bottom support member (10).

10. The battery pack according to claim 9, characterized in that: The buffer layer (60) is a foam buffer layer (60); and / or, the buffer layer (60) has a thickness of 1-3 mm; And / or, the thermal conductivity of the buffer layer (60) is 0.04-0.1w / m·k.

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