Battery pack and electric device

Abstract

The utility model relates to battery technology field discloses a kind of battery pack and electric device, and battery pack includes: box, including bottom plate;Multiple electric core, set in box, multiple electric core is arranged along first direction, each electric core includes shell, shell includes shell and top cover, shell has the opening of at least one side along second direction, top cover closes opening and is welded with shell to form weld joint;Heat exchange plate, along third direction, heat exchange plate is set between bottom plate and shell, first direction, second direction and third direction are perpendicular two by two;Thermal conductive adhesive, adhesion is between heat exchange plate and shell and avoids the weld joint;Wherein, along second direction, the length of shell is L, the spacing between thermal conductive adhesive and weld joint is e, satisfy, 0.02L≤e≤0.04L. It can reduce the risk that thermal conductive adhesive pulls electric core and causes weld joint to crack, prevent leakage, improve battery pack safety.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery packs and electrical devices. Background Technology

[0002] With the rapid development of new energy technologies, battery packs are widely used in vehicles and other fields. A battery pack consists of multiple cells, and the cell casings and top covers are typically connected by welding. During vehicle operation, the welds between the casings and top covers are prone to cracking, leading to leakage risks and posing safety hazards. Utility Model Content

[0003] In view of this, the present invention provides a battery pack and an electrical device to solve the problem that the weld between the casing and the top cover of the battery cell in the battery pack is prone to cracking, which leads to leakage risk and safety hazards.

[0004] In a first aspect, this utility model provides a battery pack, comprising: a housing, including a base plate; a plurality of battery cells disposed within the housing, the plurality of battery cells being arranged along a first direction, each battery cell including a housing, the housing including a shell and a top cover, the shell having an opening on at least one side along a second direction, the top cover closing the opening and being welded to the shell to form a weld; a heat exchange plate along a third direction, the heat exchange plate being disposed between the base plate and the shell, the first direction, the second direction, and the third direction being perpendicular to each other; and thermally conductive adhesive, bonded between the heat exchange plate and the shell and avoiding the weld; wherein, along the second direction, the length of the shell is L, and the distance between the thermally conductive adhesive and the weld is e, satisfying 0.02L≤e≤0.04L.

[0005] Beneficial effects: By bonding the thermally conductive adhesive between the casing and the heat exchange plate, and by avoiding the weld seam, the risk of weld seam cracking due to the thermally conductive adhesive pulling on the battery cell is reduced, preventing leakage and improving battery pack safety. When e is greater than or equal to 0.02L, there is a larger gap between the thermally conductive adhesive and the weld seam, reducing the risk of weld seam cracking; when e is less than or equal to 0.04L, the bonding area between the casing and the heat exchange plate is increased, improving bonding strength and thermal conductivity. Therefore, 0.02L ≤ e ≤ 0.04L can both reduce the risk of weld seam cracking and improve bonding strength and thermal conductivity.

[0006] In one optional embodiment, the thickness of the thermally conductive adhesive is h1, satisfying 0.5mm≤h1≤2mm.

[0007] Beneficial effects: When h1 is greater than or equal to 0.5mm, better bonding strength can be obtained, and the battery cell is more securely fixed; when h1 is less than or equal to 2mm, the thickness of the thermally conductive adhesive is not too thick, which can improve the thermal conductivity; therefore, 0.5mm≤h1≤2mm can obtain both better bonding strength and improved thermal conductivity.

[0008] In one optional embodiment, the battery pack further includes: a pressure plate connected to the housing, located on the side of the housing away from the bottom plate along the third direction, to press the battery cell between the pressure plate and the bottom plate; and structural adhesive bonded between the pressure plate and the housing, avoiding the weld; wherein, along the second direction, the distance between the structural adhesive and the weld is f, satisfying 0.02L≤f≤0.3L.

[0009] Beneficial effects: By bonding the pressure plate and the casing with structural adhesive while avoiding weld seams, the risk of weld seam cracking caused by the structural adhesive pulling on the battery cell can be reduced, preventing leakage and improving battery pack safety. When f is greater than or equal to 0.02L, there is a larger gap between the structural adhesive and the weld seam, reducing the risk of weld seam cracking; when f is less than or equal to 0.3L, the bonding area between the casing and the heat exchange plate can be increased, improving bonding strength and thermal conductivity. Therefore, 0.02L ≤ f ≤ 0.3L can both reduce the risk of weld seam cracking and improve bonding strength and thermal conductivity.

[0010] In one optional embodiment, the thickness of the structural adhesive is h2, satisfying 0.5mm≤h2≤2mm.

[0011] Beneficial effects: When h2 is greater than or equal to 0.5mm, better bonding strength can be obtained, and the battery cells are more securely fixed; when h2 is less than or equal to 2mm, the thickness of the structural adhesive is not too thick, reducing space occupation and improving the utilization rate of the enclosure space, thereby increasing the volumetric energy density of the battery pack; therefore, 0.5mm≤h2≤2mm can obtain both good bonding strength and reduce space occupation, improving the utilization rate of the enclosure space and increasing the volumetric energy density of the battery pack.

[0012] In one optional embodiment, the housing includes side beams and a middle beam. The side beams are connected to the base plate and surround the base plate to form a receiving space for accommodating multiple battery cells. The middle beam is connected to the side beams at both ends along the first direction, dividing the receiving space into a first receiving space and a second receiving space. Multiple battery cells are disposed in both the first and second receiving spaces. Along the second direction, the top cover faces the middle beam, and a pressure relief device is disposed on the top cover. The structure is as follows: along the second direction, the gap between the pressure relief mechanism and the intermediate beam is d, and the width of the housing is W, satisfying 15mm≤d≤W / 2-L-(a+b+1 / 2c), where a is the width of the side beam along the second direction; b is the distance between the outer shell and the side beam along the second direction; c is the width of the intermediate beam along the second direction; and / or, the width W of the housing satisfies 600mm≤W≤1500; the length L of the outer shell satisfies 200mm≤L≤600mm.

[0013] Beneficial effects: When d is greater than or equal to 15mm, the pressure relief mechanism has a larger ejection space. When thermal runaway occurs in the battery cell, the high-temperature ejected material can be smoothly ejected from the pressure relief mechanism, reducing the risk of battery cell explosion and improving safety. When d is less than or equal to W / 2-L-(a+b+1 / 2c), it can improve the utilization rate of the housing space and increase the volumetric energy density of the battery pack. Therefore, when 15mm≤d≤W / 2-L-(a+b+1 / 2c), it can both reduce the risk of battery cell explosion and increase the volumetric energy density of the battery pack.

[0014] In one alternative embodiment, along the second direction, the width c of the intermediate beam satisfies 27mm≤c≤50mm.

[0015] Beneficial effects: A width c of 27mm or more increases the sealing area between the intermediate beam and the heat exchange plate, improving the sealing effect. It also enhances the structural strength of the intermediate beam and its resistance to the impact of high-temperature ejected materials. A width c of 50mm or less controls the weight of the enclosure, contributing to weight reduction. Therefore, a width of 25mm ≤ c ≤ 50mm not only enhances the structural strength of the intermediate beam and improves its impact resistance but also controls the weight of the enclosure, thus contributing to weight reduction.

[0016] In one alternative embodiment, the intermediate beam is fixedly connected to the heat exchange plate by the thermally conductive adhesive and fasteners.

[0017] Beneficial effect: This can improve the connection strength between the intermediate beam and the heat exchange plate.

[0018] In one alternative embodiment, along the second direction, the distance b between the outer shell and the side beam satisfies b ≥ 35 mm.

[0019] Beneficial effects: When the distance b between the outer casing and the side beam is greater than or equal to 35mm, the side beam can be better buffered when it is impacted, reducing the degree of damage to the battery cell and improving the safety of the battery cell.

[0020] In one alternative embodiment, the housing further includes a cover plate connected to the side beam to cover the accommodating space, wherein the width 'a' of the side beam along the second direction satisfies 25mm ≤ a ≤ 50mm.

[0021] Beneficial effects: When the width 'a' of the side beam is greater than or equal to 25mm, the sealing effect between the side beam and the cover plate can be improved, as well as the structural strength of the side beam, the impact resistance can be improved, and the battery cells can be better protected; when the width 'a' of the side beam is less than or equal to 50mm, the weight of the enclosure can be controlled, which helps to reduce weight; therefore, 25mm≤a≤50mm can improve the structural strength of the side beam, improve the impact resistance, and control the weight of the enclosure, which helps to reduce weight.

[0022] Secondly, this utility model also provides an electrical device, including a battery pack according to any embodiment of the first aspect.

[0023] Beneficial effects: Since the electrical device includes the battery pack of the first aspect, the electrical device also has the same technical effects as the battery pack, which will not be elaborated here. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present utility model;

[0026] Figure 2 for Figure 1 Cross-sectional view cut along EE;

[0027] Figure 3 for Figure 2 A magnified view of the middle F position;

[0028] Figure 4 for Figure 2 A magnified view of the area at position G in the middle;

[0029] Figure 5 for Figure 2 A magnified view of the N position in the diagram.

[0030] Explanation of reference numerals in the attached figures:

[0031] 10-Box body; 11-Bottom plate; 12-Side beam; 13-Intermediate beam; 20-Battery cell; 21-Outer shell; 211-Shell; 212-Top cover; 21a-Weld; 30-Heat exchange plate; 40-Thermal conductive adhesive; 50-Pressure plate; 60-Structural adhesive; 70-Fastener; 2121-Pressure relief mechanism; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] A battery pack consists of multiple cells, and the cell casings and top covers are typically connected by welding. During vehicle operation, encountering bumpy road conditions causes the battery pack to vibrate, potentially leading to cracks at the welds between the casings and top covers, posing a risk of leakage and creating a safety hazard.

[0034] The inventors discovered that the thermally conductive adhesive between the water-cooling plate and the battery cell covered the weld between the casing and the top cover. During vehicle operation, encountering bumpy road conditions caused the thermally conductive adhesive to pull on the casing, which was the main cause of cracking at the weld between the casing and the top cover. To address this, thermally conductive adhesive was placed between the water-cooling plate and the casing, avoiding the weld. By controlling the amount of thermally conductive adhesive used, not only was the risk of cracking at the weld between the casing and the top cover reduced, but the appropriate amount of thermally conductive adhesive could also meet the requirements for bonding strength and thermal conductivity.

[0035] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0036] According to an embodiment of the present invention, in a first aspect, a battery pack is provided, comprising: a housing 10, a plurality of battery cells 20, a heat exchange plate 30, and thermally conductive adhesive 40.

[0037] The housing 10 includes a base plate 11. Multiple battery cells 20 are disposed within the housing 10, arranged along a first direction X. Each battery cell 20 includes a housing 21, which comprises a shell 211 and a top cover 212. The shell 211 has an opening on at least one side along a second direction Y. The top cover 212 closes the opening and is welded to the shell 211 to form a weld 21a. A heat exchange plate 30 is disposed between the base plate 11 and the shell 21 along a third direction Z, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other. Thermally conductive adhesive 40 is bonded between the heat exchange plate 30 and the shell 211, avoiding the weld 21a. The length of the shell 21 along the second direction Y is L (…). Figure 2 As shown), the distance between the thermally conductive adhesive 40 and the weld 21a is e( Figure 4 As shown in the figure, it satisfies 0.02L≤e≤0.04L.

[0038] The first direction X can be the width direction of the battery cell 20. The second direction Y can be the length direction of the battery cell 20. The third direction Z can be the height direction of the battery cell 20, and the third direction Z is perpendicular to the base plate 11.

[0039] The battery cell 20 also includes an electrode assembly disposed within the housing 21. The housing 211 may have an opening on one side or both sides. A top cover 212 closes the opening of the housing 211, thereby forming a closed space together with the housing 211 to accommodate the electrode assembly. The top cover 212 may be welded to the opening of the housing 211, forming a weld at the opening. This closed space may also contain electrolyte or the like.

[0040] The heat exchange plate 30 is used for thermal management of the battery cell 20, such as heating or cooling the battery cell 20. The cooling of the battery cell 20 by the heat exchange plate 30 is referred to as a "water-cooled plate".

[0041] Thermally conductive adhesive 40 is bonded between the housing 211 and the heat exchange plate 30. The thermally conductive adhesive 40 avoids the weld 21a, that is, the thermally conductive adhesive 40 does not extend to the weld. In other words, there is no thermally conductive adhesive 40 at the weld 21a and the top cover 212.

[0042] When one side of the housing 211 is open, the length of the housing 21 is L, and the distance between the outer surface of the housing 211 away from the top cover 212 and the outer surface of the top cover 212 along the second direction Y.

[0043] When the shell 211 is open on both sides, the length of the shell 21 is L, and the distance between the outer surfaces of the two top covers 212 along the second direction Y is . The spacing e between the thermally conductive adhesive 40 and the weld 21a is e, and the distance between the thermally conductive adhesive 40 and the weld 21a on the same side along the second direction Y is .

[0044] The spacing e between the thermally conductive adhesive 40 and the weld 21a can be 0.02L, 0.023L, 0.025L, 0.03L, 0.032L, 0.035L, 0.04L, or any value between the two.

[0045] The thermally conductive adhesive 40 is bonded between the housing 211 and the heat exchange plate 30. The adhesive 40 avoids the weld seam 21a, reducing the risk of the weld seam 21a cracking due to the adhesive pulling on the cell 20, preventing leakage, and improving battery pack safety. When e is greater than or equal to 0.02L, there is a larger gap between the thermally conductive adhesive 40 and the weld seam 21a, reducing the risk of weld seam 21a cracking. When e is less than or equal to 0.04L, the bonding area between the housing 211 and the heat exchange plate 30 is increased, improving bonding strength and thermal conductivity. Therefore, 0.02L ≤ e ≤ 0.04L can both reduce the risk of weld seam 21a cracking and improve bonding strength and thermal conductivity.

[0046] In some embodiments, refer to Figure 4 The thickness of the thermally conductive adhesive 40 is h1, which satisfies 0.5mm≤h1≤2mm. h1 can be 0.5mm, 0.6mm, 0.8mm, 1mm, 1.5mm, 1.8mm, 2mm or any value between the two.

[0047] When h1 is greater than or equal to 0.5mm, better bonding strength can be obtained, and the battery cell 20 is more securely fixed; when h1 is less than or equal to 2mm, the thickness of the thermally conductive adhesive 40 is not too thick, which can improve the thermal conductivity. Therefore, 0.5mm≤h1≤2mm can obtain both good bonding strength and improved thermal conductivity.

[0048] In some embodiments, refer to Figure 1 and Figure 5 The battery pack also includes a pressure plate 50 and structural adhesive 60. The pressure plate 50 is connected to the housing 10. Along the third direction Z, the pressure plate 50 is located on the side of the housing 211 away from the bottom plate 11 to press the battery cell 20 between the pressure plate 50 and the bottom plate 11. The structural adhesive 60 is bonded between the pressure plate 50 and the housing 211, avoiding the weld 21a. Along the second direction Y, the distance between the structural adhesive 60 and the weld 21a is f, satisfying 0.02L ≤ f ≤ 0.3L. f can be 0.02L, 0.05L, 0.1L, 0.15L, 0.2L, 0.23L, 0.3L, or any value between two of these.

[0049] Structural adhesive 60 does not extend to weld 21a; in other words, there is no structural adhesive 60 at weld 21a and top cover 212.

[0050] By bonding the pressure plate 50 to the casing 211 with structural adhesive 60 while avoiding the weld 21a, the risk of the weld 21a cracking due to the structural adhesive 60 pulling on the cell 20 can be reduced, preventing leakage and improving battery pack safety. When f is greater than or equal to 0.02L, there is a larger gap between the structural adhesive 60 and the weld 21a, reducing the risk of weld 21a cracking; when f is less than or equal to 0.3L, the bonding area between the casing 211 and the heat exchange plate 30 can be increased, improving bonding strength and thermal conductivity. Therefore, 0.02L ≤ f ≤ 0.3L can both reduce the risk of weld 21a cracking and improve bonding strength and thermal conductivity.

[0051] In some embodiments, refer to Figure 5 The thickness of structural adhesive 60 is h2, which satisfies 0.5mm≤h2≤2mm.

[0052] h2 can be 0.5mm, 0.6mm, 0.8mm, 1mm, 1.5mm, 1.8mm, 2mm or any value between the two.

[0053] When h2 is greater than or equal to 0.5mm, better bonding strength can be obtained, and the battery cell 20 is more securely fixed; when h2 is less than or equal to 2mm, the thickness of the structural adhesive 60 is not too thick, reducing space occupation and improving the space utilization of the enclosure 10; therefore, 0.5mm≤h2≤2mm can obtain both better bonding strength and reduce space occupation, thus improving the space utilization of the enclosure 10.

[0054] In some embodiments, refer to Figures 1 to 3 The housing 10 includes side beams 12 and a middle beam 13. The side beams 12 are connected to the base plate 11 and surround the base plate 11 to form a receiving space for accommodating multiple battery cells 20. The middle beam 13 is connected to the side beams 12 at both ends along the first direction X, and the middle beam 13 divides the receiving space into a first receiving space and a second receiving space. Multiple battery cells 20 are arranged in both the first and second receiving spaces. Along the second direction Y, the top cover 212 is arranged facing the middle beam 13, and a pressure relief mechanism 2121 is provided on the top cover 212. The gap between the pressure relief mechanism 2121 and the middle beam 13 along the second direction Y is d, and the width of the housing 10 is W, satisfying 15mm≤d≤W / 2-L-(a+b+1 / 2c).

[0055] When top covers 212 are provided on both sides of the housing 211, a pressure relief mechanism 2121 is provided on one of the top covers 212 near the intermediate beam 13 along the second direction Y. The pressure relief mechanism 2121 can be an explosion-proof valve or a weak structure installed on the top cover 212. The gap between the pressure relief mechanism 2121 and the intermediate beam 13 is d, which can also be the distance between the outer side of the top cover 212 and the intermediate beam 13. The width W of the housing 10 is the distance between the outer surfaces of the two opposite side beams 12 along the second direction Y.

[0056] The intermediate beam 13 is fixedly connected to the heat exchange plate 30 by thermally conductive adhesive 40 and fasteners 70. The fasteners 70 can be bolts, screws, etc. This improves the connection reliability of the intermediate beam 13.

[0057] Reference Figure 2 The dimension d can be obtained by W / 2 - L - (a + b + 1 / 2c), where a is the width of the side beam 12 along the second direction Y, satisfying 25mm ≤ a ≤ 50mm. b is the distance between the outer shell 21 and the side beam 12 along the second direction Y, satisfying b ≥ 35mm. c is the width of the middle beam 13 along the second direction Y, satisfying 27mm ≤ c ≤ 50mm. The minimum value of (a + b + 1 / 2c) can be 73.5mm.

[0058] The width W of the housing 10 and the length L of the outer casing 21 can be determined according to actual needs. When the battery cell 20 is a blade battery cell, the length L of the outer casing 21 can be 200mm to 600mm. The width W of the housing 10 can be 600mm to 1500mm.

[0059] When d is greater than or equal to 15mm, the pressure relief mechanism 2121 has a larger ejection space. When thermal runaway occurs in the battery cell 20, the high-temperature ejected material can be smoothly ejected from the pressure relief mechanism 2121, reducing the risk of battery cell 20 explosion and improving safety. When d is less than or equal to W / 2-L-(a+b+1 / 2c), the space utilization rate of the housing 10 can be improved, and the volumetric energy density of the battery pack can be increased. Therefore, when 15mm≤d≤W / 2-L-(a+b+1 / 2c), the risk of battery cell 20 explosion can be reduced, and the volumetric energy density of the battery pack can be increased.

[0060] A width 'a' of side beam 12 greater than or equal to 25mm can improve its structural strength, enhance its impact resistance, and better protect the battery cell 20. The maximum width 'a' of side beam 12 can be determined based on actual needs; however, while a larger width 'a' can improve structural strength, it will increase the overall weight of the battery pack. For example, the width 'a' of side beam 12 can be less than or equal to 50mm.

[0061] The width c of the intermediate beam 13 is greater than or equal to 27mm, which can improve the structural strength of the intermediate beam 13 and enhance its resistance to the impact of high-temperature ejected materials. The maximum width c of the intermediate beam 13 can be determined according to actual needs; however, while a larger width c can improve structural strength, it will increase the overall weight of the battery pack. For example, the width c of the intermediate beam 13 can be less than or equal to 50mm.

[0062] The distance b between the outer casing 21 and the side beam 12 is greater than or equal to 35mm. This provides better cushioning when the side beam 12 is impacted, reducing the damage to the battery cell 20 and improving its safety. However, if the distance b is too large, it can lead to low space utilization in the housing 10. This distance can be adjusted according to actual needs.

[0063] According to an embodiment of the present invention, in a second aspect, an electrical device is also provided, including a battery pack according to any embodiment of the first aspect.

[0064] Electrical devices can be vehicles, which can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended vehicles, etc.

[0065] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: The enclosure, including the base plate; Multiple battery cells are disposed in the housing, the multiple battery cells are arranged along a first direction, each battery cell includes a housing, the housing includes a shell and a top cover, the shell has an opening on at least one side along a second direction, and the top cover closes the opening and is welded to the shell to form a weld. A heat exchange plate is disposed between the base plate and the outer shell along a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; Thermally conductive adhesive is used to bond the heat exchange plate to the housing while avoiding the weld seam. Wherein, along the second direction, the length of the outer shell is L, and the distance between the thermally conductive adhesive and the weld is e, satisfying 0.02L≤e≤0.04L.

2. The battery pack according to claim 1, characterized in that, The thickness of the thermally conductive adhesive is h1, which satisfies the condition 0.5mm≤h1≤2mm.

3. The battery pack according to claim 1, characterized in that, The battery pack also includes: A pressure plate, connected to the housing, is located on the side of the housing away from the bottom plate along the third direction, so as to press the battery cell between the pressure plate and the bottom plate; Structural adhesive is used to bond the pressure plate and the housing, while avoiding the weld seam; Wherein, along the second direction, the distance between the structural adhesive and the weld is f, which satisfies 0.02L≤f≤0.3L.

4. The battery pack according to claim 3, characterized in that, The thickness of the structural adhesive is h2, which satisfies the condition 0.5mm≤h2≤2mm.

5. The battery pack according to claim 1, characterized in that, The housing includes side beams and a middle beam. The side beams are connected to the bottom plate and are arranged around the bottom plate to form a receiving space for accommodating multiple battery cells. The two ends of the middle beam along the first direction are respectively connected to the side beams. The middle beam divides the receiving space into a first receiving space and a second receiving space. Multiple battery cells are arranged in both the first receiving space and the second receiving space. Along the second direction, the top cover and the intermediate beam are arranged facing each other, and the top cover is provided with a pressure relief mechanism; Wherein, along the second direction, the gap between the pressure relief mechanism and the intermediate beam is d, and the width of the box is W, satisfying 15mm≤d≤W / 2-L-(a+b+1 / 2c), where a is the width of the side beam along the second direction; b is the distance between the outer shell and the side beam along the second direction; and c is the width of the intermediate beam along the second direction. And / or, The width W of the enclosure satisfies 600mm≤W≤1500; the length L of the outer shell satisfies 200mm≤L≤600mm.

6. The battery pack according to claim 5, characterized in that, Along the second direction, the width c of the intermediate beam satisfies 27mm≤c≤50mm.

7. The battery pack according to claim 5, characterized in that, The intermediate beam and the heat exchange plate are fixedly connected by the thermally conductive adhesive and fasteners.

8. The battery pack according to claim 5, characterized in that, Along the second direction, the distance b between the outer shell and the side beam satisfies b≥35mm.

9. The battery pack according to claim 5, characterized in that, The enclosure also includes a cover plate, which is connected to the side beam to seal the accommodating space; Along the second direction, the width 'a' of the side beam satisfies 25mm ≤ a ≤ 50mm.

10. An electrical device, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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