Battery pack and electric device

Abstract

The present disclosure provides a battery pack and an electric device, the battery pack comprising: a battery pack; a box body comprising a bottom plate and a frame connected to the bottom plate to form a containing cavity; a support received in the containing cavity, the support being provided with a connecting fitting part; and a connecting piece having a first end and a second end, the first end of the connecting piece being fixedly connected to the support after penetrating through the connecting fitting part, and the second end of the connecting piece being welded to the bottom plate. Compared with the related art, the present disclosure welds the connecting piece to the bottom plate of the box body, without pre-opening holes on the bottom plate of the box body, thus saving additional sealing pads or glue guide grooves, and keeping the bottom plate intact and continuous, which not only avoids stress concentration and structural weakening caused by opening holes, but also eliminates the hidden danger of opening holes destroying the sealing continuity. Therefore, the structural strength of the box body is improved, the sealing performance is improved, and the manufacturing difficulty is reduced.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] With the rapid development of the new energy industry, battery packs, as the core component of energy storage systems, have become a focus of attention in related fields due to their structural reliability, thermal management efficiency, and sealing performance. In related technologies, battery packs typically include a housing and a heat exchange plate located at the bottom of the housing. The heat exchange plate is used to achieve heat exchange between the battery modules and the external cooling medium to maintain a stable battery operating temperature.

[0003] When the heat exchange plate and the housing are made of different materials, traditional welding processes cannot be used for connection due to differences in their coefficients of thermal expansion and welding compatibility issues. In such cases, bolted connections with adhesive or riveting with adhesive are generally used. This method requires pre-drilling holes in the bottom plate of the housing, which reduces structural strength and housing sealing performance. Furthermore, the precise positioning of the pre-drilled holes and their presence also increase the difficulty of applying adhesive (e.g., requiring the use of adhesive guide channels), further increasing manufacturing complexity. Utility Model Content

[0004] The purpose of this disclosure is to provide a battery pack and electrical equipment to solve the problems of low structural strength, poor sealing performance, and high manufacturing difficulty caused by the opening of the bottom plate of the casing in the related technology.

[0005] In a first aspect, this disclosure provides a battery pack, comprising:

[0006] Battery pack;

[0007] The housing includes a base plate and a frame, the frame being connected to the base plate to form a cavity for housing the battery pack;

[0008] A support member, housed within the receiving cavity, is used to support the battery pack and has a connecting mating portion thereon; and

[0009] A connector having a first end and a second end, wherein the first end of the connector passes through the connecting mating part and forms a fixed connection with the support member, and the second end of the connector is welded to the base plate.

[0010] Secondly, this disclosure provides an electrical device including the aforementioned battery pack.

[0011] Compared with related technologies, this disclosure eliminates the need for pre-drilling holes in the bottom plate of the enclosure by welding the connector to the bottom plate, thus saving the need for additional sealing gaskets or adhesive guide grooves. The bottom plate remains intact and continuous, avoiding stress concentration and structural weakening caused by openings, and eliminating the potential for openings to disrupt the seal continuity. Therefore, it improves the structural strength of the enclosure, enhances sealing performance, and reduces manufacturing difficulty. Attached Figure Description

[0012] Figure 1 This is a perspective view of the battery pack provided in an embodiment of this disclosure.

[0013] Figure 2 yes Figure 1 The battery pack shown is a top view.

[0014] Figure 3 yes Figure 1 The diagram shows the structural connection point between the battery pack connector and the housing.

[0015] Figure 4 yes Figure 1 The diagram shows the structural configuration of the battery pack's support components, connectors, and base plate.

[0016] Explanation of reference numerals in the attached figures:

[0017] 10-Box body, 11-Base plate, 12-Frame, 13-Receiving cavity;

[0018] 20 - Support component; 21 - Connecting and mating part;

[0019] 30 - Connector, 31 - Weld stamp;

[0020] 40 - Adhesive layer;

[0021] 50 - Reinforcing component, 51 - First reinforcing body, 52 - Second reinforcing body;

[0022] 60-Barrier part. Detailed Implementation

[0023] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this disclosure, and should not be construed as limiting this disclosure.

[0024] With the rapid development of the new energy industry, battery packs, as the core component of energy storage systems, have become a focus of industry attention due to their structural reliability, thermal management efficiency, and sealing performance. In related technologies, battery packs typically include a housing and a heat exchange plate located at the bottom of the housing. The heat exchange plate is used to facilitate heat exchange between the battery modules and the external cooling medium to maintain a stable battery operating temperature.

[0025] In practical applications, when the heat exchange plate and the housing are made of different materials (such as aluminum alloy heat exchange plate and steel housing), traditional welding processes cannot be used for connection due to differences in the thermal expansion coefficients of the materials and welding compatibility issues. Currently, the industry generally adopts the following alternative solutions:

[0026] Bolted connection with adhesive: Multiple through holes need to be made in the bottom plate of the box. The heat exchange plate is mechanically fixed to the box with bolts, and adhesive is used to fill the gaps to assist in sealing and heat transfer.

[0027] Riveting and gluing: Mechanical riveting is achieved by using rivets, and adhesives are used to enhance the connection strength and sealing.

[0028] However, the applicant discovered the following significant flaws in the aforementioned technical solution:

[0029] (1) The pre-drilling process damages the integrity of the bottom plate of the box, and the position accuracy of the opening is required, which increases the processing difficulty and cost.

[0030] (2) Dense openings will reduce the structural strength of the bottom plate of the box and affect the overall mechanical reliability of the battery pack.

[0031] (3) The opening area disrupts the sealing continuity of the enclosure, requiring additional design of sealing gaskets or adhesive structures, which increases the risk of sealing failure.

[0032] (4) If there are openings in the bottom plate of the box, the adhesive may seep into the openings and cause pollution or loss. It is necessary to design additional complex structures such as adhesive guide channels, which further increases the complexity of the process and the manufacturing cost.

[0033] To overcome the shortcomings of the above technical solutions, referring to Figures 1 to 3 As shown, this disclosure provides a battery pack, including a housing 10, a support member 20, and a connector 30.

[0034] The housing 10 includes a base plate 11 and a frame 12. The base plate 11 is a single plate structure, and the frame 12 can be a four-sided frame or annular sidewall. The frame 12 is connected to the base plate 11 by welding or riveting to enclose and form a receiving cavity 13. The receiving cavity 13 is used to house internal components such as the battery pack and support member 20.

[0035] The support member 20 can be a tray or a heat exchange plate for supporting the battery pack. The support member 20 is provided with a connecting mating part 21, which can be a threaded hole, a bayonet, a boss, a rivet hole or a welding bevel, etc., to connect with the connector 30. In this embodiment, the support member 20 is a heat exchange plate as an example. The support member 20 not only provides support and installation, but also has a heat conduction function.

[0036] The connector 30 has a first end and a second end. The connector 30 can be a stud, rivet, T-shaped nail, L-shaped bracket, or stepped shaft, etc. The first end of the connector 30 passes through the connecting mating part 21 and forms a fixed connection with the support member 20. The connection method can be threaded engagement, interference fit riveting, snap-fit, or welding, etc. The second end of the connector 30 is welded to the base plate 11. The welding method can be resistance spot welding, laser welding, friction stir welding, or brazing, etc. By welding the connector 30 to the base plate 11 of the housing 10, there is no need to pre-drill holes in the base plate 11 of the housing 10, saving the need for additional sealing gaskets or adhesive guide grooves. The base plate 11 remains intact and continuous, which avoids stress concentration and structural weakening caused by opening holes, and eliminates the hidden danger of opening holes disrupting the sealing continuity, thus significantly improving the structural strength of the housing 10.

[0037] Furthermore, the second end of the connector 30 is welded to the side of the base plate 11 facing the support member 20. The welding position is located at the bottom of the receiving cavity 13, reducing the risk of damage. The outer surface of the base plate 11 remains non-porous, eliminating stress concentration and external leakage paths caused by conventional bolt holes.

[0038] Preferably, refer to Figure 4 As shown, a weld mark 31 is formed at the welding point between the connector 30 and the base plate 11. The area of ​​the weld mark 31 is S, and the end face area of ​​the first end of the connector 30 is S1. The formula value of S / S1 is limited to a preset range, where 1≤S / S1≤1.5. Specifically, it can be 1, 1.1, 1.2, 1.3, 1.4 or 1.5. The value can be the aforementioned listed values ​​or any value between 1 and 1.5.

[0039] The formula value of S / S1 cannot be too small. If it is too small and does not reach the lower limit of the preset range, the weld width or penetration depth will be insufficient, and the weld mark 31 will become a weak link, reducing the connection strength between the connector 30 and the housing 10. When the battery pack is subjected to vibration or impact, the weld mark 31 will be subjected to tensile or shear forces, and the connector 30 will be easily pulled out or cut off, increasing safety hazards.

[0040] The formula value of S / S1 should not be too large. If it is too large, it will exceed the upper limit of the preset range, resulting in an excessively wide molten pool. Excessive heat input will cause localized overheating of the base plate 11, which can easily lead to dents or warping, affecting flatness. It can also easily burn through the base plate 11 or damage the surface coating, reducing corrosion resistance.

[0041] Furthermore, referring to Figure 1 as well as Figure 2 As shown, inside the battery pack, the connectors 30 and the connecting mating parts 21 are not arranged at a single point, but appear in groups. There are multiple connectors 30 and multiple connecting mating parts 21. The number and position of the connectors 30 are completely matched with the number and position of the connecting mating parts 21. The multiple connecting mating parts 21 are distributed at intervals along the circumference of the support member 20, arranged in a ring, polygon or segmented manner, forming multiple dispersed connection paths. The weight, expansion force and external vibration load of the battery pack are distributed to multiple connection paths, reducing the load peak of a single solder mark 31, and single-point failure will not cause the support member 20 to loosen, thus improving redundancy and reliability.

[0042] In the embodiments provided in this disclosure, a longitudinal beam (not shown) is provided inside the receiving cavity 13. The longitudinal beam is used to divide the receiving cavity 13 into multiple subspaces, each of which is a battery compartment. The battery compartments are independent of each other, realizing failure isolation and thermal runaway zoning management. Each battery compartment contains one or more battery packs, and each battery pack is housed in the corresponding battery compartment. In one feasible embodiment, a longitudinal beam is provided inside the receiving cavity 13. The longitudinal beam is fixed to the inner wall of the receiving cavity 13 by welding. The length direction of the longitudinal beam extends along a first direction (e.g., the vehicle travel direction), thereby dividing the receiving cavity 13 into two battery compartments arranged side by side along a second direction (e.g., the vehicle width direction).

[0043] The longitudinal beam is a linearly extending rigid strip-shaped member to provide sufficient moment of inertia, improving the overall lateral bending and torsional stiffness of the battery pack. The support member 20 has several connecting parts 21 corresponding to the longitudinal beam. The orthographic projection of these connecting parts 21 in the thickness direction of the longitudinal beam falls on the beam, resulting in several connectors 30 distributed below the beam. These connectors 30 are spaced sequentially along the extension direction of the longitudinal beam, and can be equidistant or unequally spaced, without limitation. The weld marks 31 of these connectors 30 are located in the high-strength area of ​​the longitudinal beam, thereby reducing local buckling under vibration or impact. The local deformation at the weld mark 31 is significantly suppressed, improving the fatigue resistance of the weld mark 31 and making the connection strength more stable.

[0044] In one feasible implementation, the support member 20 is a heat exchange plate, which serves both to support the battery module and to perform heat exchange. As one structural example, the upper surface of the support member 20 is the mounting surface of the battery module, and the lower surface of the support member 20 directly or indirectly abuts against the bottom plate 11 of the housing 10. An S-shaped or parallel flow channel is integrally formed inside the support member 20. The cooling medium flows through the flow channel at a certain speed. The heat generated by the battery module during charging and discharging is diffused into the flow channel. The heated cooling medium flows through the flow channel to the external heat exchanger, and the cooled low-temperature cooling medium returns to the support member 20, forming a closed loop.

[0045] The fixed mating area formed by the connecting part 21 and the connector 30 is a high-stress area. Preferably, the minimum distance between the flow channel and the connecting part 21 is limited to 5mm. This ensures that the sidewall of the flow channel maintains sufficient solid wall thickness between itself and the high-stress area, protecting the structural strength near the flow channel and preventing the sidewall of the flow channel from being crushed or torn. At the same time, when the connector 30 is welded to the base plate 11, sufficient solid wall thickness can prevent heat from penetrating into the flow channel and causing thermal deformation of the flow channel.

[0046] In one feasible implementation, refer to Figure 3 As shown, an adhesive layer 40 is provided between the support member 20 and the base plate 11. The adhesive layer 40 is a continuous or discontinuous adhesive material, located between the lower surface of the support member 20 and the upper surface of the base plate 11, filling the gap between them. On the one hand, after curing, the adhesive layer 40 forms a high-strength adhesive interface, bonding to both the support member 20 and the base plate 11, thereby improving the overall rigidity. On the other hand, when the battery pack is subjected to vibration or impact, the adhesive layer 40 can disperse concentrated stress (such as point stress near the connector 30) to a large area, preventing local deformation or fatigue cracking of the base plate 11. Furthermore, the adhesive layer 40 can provide vibration damping, effectively filtering impacts and vibrations, and reducing NVH (noise, vibration, and harshness).

[0047] The solder mark 31 is spaced apart from the edge of the adhesive layer 40. There is a radial distance between the outermost edge of the solder mark 31 and the outermost edge of the adhesive layer 40, that is, the solder mark 31 does not directly penetrate or damage the adhesive layer 40, and the adhesive layer 40 will not overflow to the welding joint between the connector 30 and the base plate 11. The adhesive layer 40 is usually an electrical insulating material. Excess adhesive will affect the metal contact surface between the connector 30 and the base plate 11, leading to the risk of poor soldering / detachment.

[0048] Preferably, the minimum distance between the solder mark 31 and the edge of the adhesive layer 40 is 2mm. The spacing distance cannot be too small. If the spacing distance is too small and does not reach the lower limit of the preset range, the adhesive layer 40 is prone to flow towards the connector 30 due to the squeezing action before curing, and penetrate into the metal contact surface between the connector 30 and the base plate 11. During welding, the energy is blocked by the adhesive layer 40, resulting in poor welding and incomplete fusion.

[0049] In the embodiments provided in this disclosure, the support member 20 completely covers the adhesive layer 40, and the ratio of the orthographic projection area of ​​the adhesive layer 40 on the base plate 11 to the orthographic projection area of ​​the support member 20 on the base plate 11 is between 0.5 and 1. Specifically, it can be 0.5, 0.6, 0.7, 0.8, 0.9, or 1, and the value can be any value between 0.5 and 1, as listed above.

[0050] The ratio cannot be too small. If it is too small and does not reach the lower limit of the preset range, the adhesive layer 40 will be unevenly distributed or the edges will be missing adhesive. The local area not filled by the adhesive layer 40 will be too large, which will weaken the vibration reduction effect and reduce the overall stiffness.

[0051] The ratio cannot be too large. If it is too large, it will exceed the upper limit of the preset range, resulting in excessive glue usage. The outer edge of the glue layer 40 will overflow onto the outside of the support 20, which will waste materials, increase costs, and may interfere with adjacent components.

[0052] Furthermore, referring to Figure 4 As shown, a sealant 60 is provided on the outer periphery of the connector 30. The sealant 60 can be a sleeve structure. The sealant 60 extends towards the support 20 in a direction perpendicular to the base plate 11. The sealant 60 is located on the outer periphery of the connector 30 and surrounds the connector 30. The sealant 60 fits against the support 20, and the top of the sealant 60 forms a zero-gap contact with the bottom surface of the support 20 (the two are just in contact after assembly, with no visible gap) or a slight interference contact (the sealant 60 is slightly higher than the support 20, and the support 20 is slightly compressed after being fixed, improving the sealing and limiting effect). There is no longer a vertical gap between the top of the sealant 60 and the support 20 for the adhesive to flow, thereby further preventing the adhesive from overflowing to the weld between the connector 30 and the base plate 11. Furthermore, after the adhesive-blocking component 60 is attached to the support component 20, it is equivalent to adding a longitudinal support rib below the support component 20, which can significantly reduce the deflection of the support component 20 under vibration or internal pressure and improve the overall resistance to deformation.

[0053] The minimum distance between the adhesive-blocking component 60 and the solder mark 31 must be greater than 2mm. The distance between the adhesive-blocking component 60 and the solder mark 31 cannot be too small. If the distance is too small and does not reach the lower limit of the preset range, the welding heat during the welding of the connector 30 to the base plate 11 can easily affect the adhesive-blocking component 60, causing it to deform due to heat, reducing the adhesive-blocking effect, or even causing adhesive-blocking failure. The distance between the adhesive-blocking component 60 and the solder mark 31 cannot be too large. If the distance is too large, the un-adhesive area will be too long, resulting in a decrease in local rigidity.

[0054] In the embodiments provided in this disclosure, the housing 10 is integrally stamped, and the frame 12 and the bottom plate 11 are formed from the same metal sheet in one piece without welds or riveting. A reinforcing member 50 is provided in the receiving cavity 13, and the reinforcing member 50 forms an internal truss in the receiving cavity 13 to improve the torsional stiffness of the housing 10 and prevent deformation of the bottom plate 11 and the frame 12.

[0055] Specifically, refer to Figure 3 As shown, the reinforcing member 50 has a first reinforcing body 51 and a second reinforcing body 52, which are directly or indirectly connected. In one feasible embodiment, the first reinforcing body 51 can be a vertical stiffener, and the second reinforcing body 52 can be a horizontal stiffener. The reinforcing member 50 is preferably integrally formed to improve structural strength. The first reinforcing body 51 is connected to the frame 12, and the second reinforcing body 52 is connected to the base plate 11. When the frame 12 is subjected to lateral impact, the reinforcing member 50 converts the bending moment into an axial force and transmits it to the base plate 11, reducing local deformation of the frame 12. At the same time, the force exerted by the battery pack on the support member 20 can also be transmitted from the base plate 11 to the frame 12 through the reinforcing member 50, increasing the load-bearing capacity of the support member 20.

[0056] In one feasible embodiment, the connector 30 passes through the second reinforcing body 52 and is welded to the base plate 11. A pre-set hole is provided on the second reinforcing body 52, through which the connector 30 can pass and be welded to the base plate 11, transforming the connector 30 from a single-point suspension to a cross-beam support. Impacts or vibrations experienced by the connector 30 are diffused to the base plate 11 and the second reinforcing body 52. ​​The weld seam between the connector 30 and the base plate 11 bears the main tensile / shear forces, while the connection point between the connector 30 and the second reinforcing body 52 can bear a portion of the load, thereby reducing the stress at the weld mark 31 on the base plate 11. This reduces the bending moment at the weld mark 31, thus increasing the connection strength between the connector 30 and the base plate 11. Even if the weld mark 31 of the connector 30 fails, the blocking effect of the second reinforcing body 52 can limit the displacement of the connector 30, maintaining the stable support state of the support member 20.

[0057] Furthermore, the first reinforcing member 51 is welded to the frame 12, with its entire surface attached to the inner side of the frame 12, effectively adding a longitudinal reinforcing rib to the frame 12. The second reinforcing member 52 is welded to the base plate 11, with its entire surface attached to the base plate 11, effectively adding a transverse reinforcing rib to the inner side of the base plate 11. After the first reinforcing member 51 and the second reinforcing member 52 intersect, the frame 12, the base plate 11, and the reinforcing member 50 together form a closed thin-walled box girder, significantly improving the shear stiffness of the box 10. Because the reinforcing member 50 provides in-plane stiffness, the base plate 11 and the frame 12 can be made of thinner metal plates, thereby reducing the weight of the battery pack.

[0058] In the embodiments provided in this disclosure, the support member 20 is provided with a groove, and the first end of the connector 30 is received in the groove. The groove acts as a three-dimensional stop, which can realize the precise positioning function of the connector 30. After the first end of the connector 30 is inserted, it is automatically limited in the X / Y / Z directions, and no additional positioning is required during assembly. After the first end of the connector 30 forms a connection with the connecting mating part 21, the top surface of the first end of the connector 30 should be lower than or flush with the top surface of the support member 20, so as to avoid the connector 30 protruding from the support member 20 and maintain a flat appearance. If the first end of the connector 30 protrudes from the groove, the connector 30 is prone to interference with the battery pack after the battery pack is placed on the support member 20.

[0059] In one feasible embodiment, the connector 30 is a rivet, with one end riveted to the connecting mating part 21 and the other end welded to the base plate 11. The connecting mating part 21 is a rivet hole penetrating the support member 20. The rivet includes a head and a shank. The head abuts against the upper surface of the support member 20 and is formed into a mushroom head through cold forging, creating a permanent mechanical riveting connection. This eliminates the need for thread machining and anti-loosening washers, thus eliminating the risk of thread loosening. The shank passes through the rivet hole and is welded to the base plate 11 at its end. In this way, one end of the rivet is mechanically locked to the support member 20, and the other end is metallurgically locked to the base plate 11.

[0060] In one feasible embodiment, the support member 20 is a heat exchange plate, and the connecting part 21 can be recessed one end distance towards the side closer to the base plate 11 to avoid the cooling flow channel. This recess can take the form of a stepped hole, a countersunk flange, or a partially thin-walled groove. The shortest gap between the connecting part 21 and the base plate 11 is 0mm-5mm. Specifically, it can be 0mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, or 5mm. The values ​​can be those listed above or any value between 0mm and 5mm.

[0061] The gap cannot be too small; if it is, the bottom surface of the support member 20 will make metal-to-metal contact with the top surface of the base plate 11, forming a rigid support. The gap cannot be too large; if it is too large, it will encroach on the height space inside the receiving cavity 13, and may easily interfere with the components of the battery pack.

[0062] Preferably, the top surface of the support member 20 is provided with a groove, the cap body is received into the groove, and the rod body passes through the second reinforcing body 52 and is welded to the base plate 11.

[0063] Secondly, this disclosure provides an electrical device that may include the aforementioned battery pack.

[0064] By way of example only, electrical equipment can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, construction vehicles, etc.

[0065] In addition, electrical equipment can also be used for the storage, conversion, and release of recyclable electrical energy.

[0066] The above description, based on the embodiments shown in the figures, details the structure, features, and effects of this disclosure. The above description is only a preferred embodiment of this disclosure, but this disclosure does not limit the scope of implementation to what is shown in the figures. Any changes made in accordance with the concept of this disclosure, or modifications to equivalent embodiments with equivalent changes, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of this disclosure.

Claims

1. A battery pack, characterized in that, include: Battery pack; The housing includes a base plate and a frame, the frame being connected to the base plate to form a cavity for housing the battery pack; A support member, housed within the receiving cavity, is used to support the battery pack and has a connecting mating portion thereon; and A connector having a first end and a second end, wherein the first end of the connector passes through the connecting mating part and forms a fixed connection with the support member, and the second end of the connector is welded to the base plate.

2. The battery pack according to claim 1, characterized in that, The second end of the connector is welded to the side of the base plate facing the support.

3. The battery pack according to claim 1, characterized in that, The weld mark is formed at the joint between the connector and the base plate, the area of ​​the weld mark is S, and the end face area of ​​the first end of the connector is S1, where 1≤S / S1≤1.

5.

4. The battery pack according to claim 1, characterized in that, Multiple connectors and multiple connecting parts are provided, and the multiple connectors and multiple connecting parts are arranged in a one-to-one correspondence, with the multiple connecting parts distributed at intervals along the circumference of the support.

5. The battery pack according to claim 1, characterized in that, The cavity is provided with a longitudinal beam, which divides the cavity into multiple battery compartments. The support member is provided with several connecting parts in the area corresponding to the longitudinal beam.

6. The battery pack according to claim 1, characterized in that, The support is a heat exchange plate, and a flow channel is formed inside the heat exchange plate. The shortest distance between the flow channel and the connecting part is 5mm.

7. The battery pack according to claim 1, characterized in that, The weld mark is formed at the joint between the connector and the base plate, and an adhesive layer is provided between the support and the base plate, with the weld mark and the edge of the adhesive layer spaced apart.

8. The battery pack according to claim 7, characterized in that, The shortest distance between the solder mark and the edge of the adhesive layer is 2mm.

9. The battery pack according to claim 7, characterized in that, The ratio of the projected area of ​​the adhesive layer on the base plate to the projected area of ​​the support member on the base plate is between 0.5 and 1.

10. The battery pack according to claim 7, characterized in that, A sealant is provided on the base plate, and the sealant extends toward the support member in a direction perpendicular to the base plate. The sealant is located on the outer periphery of the connector.

11. The battery pack according to claim 10, characterized in that, The shortest distance between the adhesive barrier and the solder mark is greater than 2 mm.

12. The battery pack according to claim 10, characterized in that, The housing is integrally stamped and formed. The cavity is provided with a reinforcing member. The reinforcing member has a first reinforcing body and a second reinforcing body. The first reinforcing body and the second reinforcing body are directly or indirectly connected. The first reinforcing body is connected to the frame, and the second reinforcing body is connected to the bottom plate.

13. The battery pack according to claim 12, characterized in that, The connector passes through the second reinforcing body and is then welded to the base plate.

14. The battery pack according to claim 12, characterized in that, The first reinforcing body is welded to the frame, and the second reinforcing body is welded to the base plate.

15. The battery pack according to claim 1, characterized in that, The shortest gap between the connecting part and the base plate is 0mm-5mm.

16. The battery pack according to claim 1, characterized in that, The support member has a groove, and the first end of the connector is received in the groove.

17. The battery pack according to claim 1, characterized in that, The connector is a rivet, one end of which is riveted to the connecting mating part, and the other end of which is welded to the base plate.

18. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-17.

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