Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, and belongs to the technical field of batteries. The battery pack comprises a box body, a battery pack and an end plate, the box body has a first direction and a second direction which intersect with each other and is provided with a containing cavity, the box body comprises a beam and a supporting plate, the beam intersects with the first direction and extends in the second direction, and the beam and the supporting plate are connected and used for defining the containing cavity; the battery pack is arranged in the accommodating cavity and comprises a plurality of single batteries arranged along a first direction; the end plate is arranged in the accommodating cavity, is arranged on one side of the battery pack in the first direction and is respectively connected with the battery pack and the beam; the battery pack and the beam are connected through the end plate, the first protruding part is arranged on one of the end plate and the beam, the clamping part is arranged on the other one of the end plate and the beam, and the first protruding part is at least partially embedded into the clamping part, so that the battery pack is limited, the connection between the box body and the battery pack is more stable, and the stability and the safety of the battery pack are improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and electrical equipment. Background Technology

[0002] Currently, battery packs commonly employ extrusion-in-the-box technology, using high-performance adhesive materials to bond modules together. However, during the use of assembled battery packs, insufficient preload between the casing and the battery pack can lead to vibrations, affecting the stability and safety of the power battery. Utility Model Content

[0003] The purpose of this utility model is to provide a battery pack that overcomes the technical problem of insufficient pre-tightening force between the casing and the battery pack. Another purpose of this application is to provide electrical equipment.

[0004] Technical solution: This application discloses a battery pack, including:

[0005] A box having intersecting first and second directions and a receiving cavity, the box including beams and supporting plates, the beams intersecting the first direction and extending along the second direction, the beams being connected to the supporting plates and used to enclose the receiving cavity;

[0006] A battery pack, disposed within the receiving cavity, includes a plurality of individual battery cells arranged along the first direction;

[0007] An end plate is disposed within the receiving cavity, and the end plate is disposed on one side of the battery pack in the first direction, and connects the battery pack and the beam respectively;

[0008] One of the end plate and the beam is provided with a first protrusion and the other is provided with a snap-fit ​​portion, wherein the first protrusion is at least partially embedded in the snap-fit ​​portion.

[0009] In some embodiments, the first protrusion protrudes from the side of the end plate facing the beam, the snap-fit ​​portion is provided on the side of the beam facing the end plate, and the first protrusion has a first stepped surface, which is located on the side of the first protrusion away from the support plate.

[0010] The snap-fit ​​portion has a second stepped surface, which is located on the side of the snap-fit ​​portion facing the support plate.

[0011] The first step surface and the second step surface are at least partially opposite each other so that the first step surface and the second step surface can contact each other.

[0012] In some embodiments, the snap-fit ​​portion further includes a first wall located on the side of the snap-fit ​​portion facing the end plate, and the first wall has an angle α with the second step surface, satisfying: 30°≤α≤90°;

[0013] The first protrusion also includes a second wall, which is located on the side of the first protrusion facing the beam. The second wall has an angle b with the first step surface, satisfying 30°≤b≤90°.

[0014] In some embodiments, the housing has a third orientation, and the end plate further includes:

[0015] The ribs are located on the same side of the end plate as the first protrusion and are spaced apart along the third direction. The ribs extend from the end plate toward the beam.

[0016] Along the first direction, the size of the rib is less than or equal to the size of the first protrusion.

[0017] In some embodiments, the end plate includes a plurality of ribs, the plurality of ribs being spaced apart along the third direction, and at least one of the ribs being located on the side of the first protrusion away from the support plate, and at least one of the ribs being located between the first protrusion and the support plate.

[0018] In some embodiments, the housing has a third direction, the third direction, the first direction, and the second direction intersect each other, and along the third direction, the battery pack has a first dimension e mm, and the first step surface and the support plate have a maximum distance f mm, satisfying: 0.05≤f / e≤0.6;

[0019] The first protrusion also includes a third step surface, which is located on the side of the first protrusion away from the first step surface. Along the third direction, the third step surface and the support plate have a minimum distance g mm, which satisfies 2≤g≤20 and f>g.

[0020] In some embodiments, the end plate further includes:

[0021] A plate, which is sandwiched between the battery pack and the beam and connected to the battery pack;

[0022] The first protrusion is connected to the plate and extends from the plate toward the beam.

[0023] Along the first direction, the plate has a second dimension h mm, satisfying: 2≤h≤10, and the first protrusion has a third dimension t mm, satisfying: 0.15≤t / h≤1.5;

[0024] Along the third direction, the first protrusion has a maximum size d mm, which satisfies: 2≤d≤f.

[0025] In some embodiments, the end plate further includes a mounting base disposed at one end of the plate body away from the support plate and extending toward the side of the plate body away from the battery pack, the mounting base being connected to the plate body.

[0026] In some embodiments, the battery pack has end plates sandwiched between its two sides and the beam in the first direction.

[0027] This application also discloses an electrical device, including a battery pack as described in the above embodiments.

[0028] Beneficial Effects: The battery pack of this application embodiment includes a housing, a battery pack, and an end plate. The housing has intersecting first and second directions and a receiving cavity. The housing includes a beam and a support plate. The beam intersects the first direction and extends along the second direction. The beam and the support plate are connected to form the receiving cavity. The battery pack is disposed within the receiving cavity and includes multiple individual batteries arranged along the first direction. The end plate is disposed within the receiving cavity and is located on one side of the battery pack in the first direction, connecting the battery pack to the beam. One of the end plate and the beam has a first protrusion, and the other has a snap-fit ​​portion. The first protrusion is at least partially embedded in the snap-fit ​​portion. By connecting the battery pack and the beam through the end plate, and by providing a first protrusion on one end plate and a snap-fit ​​portion on the other, with the first protrusion at least partially embedded in the snap-fit ​​portion, the battery pack is limited, making the connection between the housing and the battery pack more stable and improving the stability and safety of the battery pack.

[0029] The electrical equipment in this application includes the battery pack described in the above embodiments, and therefore can have all the technical features and effects of the battery pack described above, which will not be repeated here. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a three-dimensional structural diagram of the battery pack according to an embodiment of this application, and the battery pack is not fully disclosed in the figure;

[0032] Figure 2 This is a top view of the battery pack according to an embodiment of this application;

[0033] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0034] Figure 4 This is a three-dimensional structural diagram of the end plate of the battery pack in an embodiment of this application;

[0035] Figure 5 This is a left view of the end plate of the battery pack in an embodiment of this application;

[0036] Figure 6 This is a schematic diagram of the left-hand structure of the beam in the battery pack according to an embodiment of this application;

[0037] Figure 7 This is a schematic diagram showing the connection relationship between the battery pack, beam, and end plate in the battery pack of an embodiment of this application;

[0038] Figure 8 for Figure 7 A magnified view of a portion of point B in the middle;

[0039] Figure 9 This is a schematic diagram showing the connection relationship between the battery pack, beam, and end plate in another embodiment of the battery pack of this application;

[0040] Figure 10 for Figure 9 A magnified view of a portion of point C in the middle;

[0041] Reference numerals: 1. Housing; X, First direction; Y, Second direction; 10. Receiving cavity; 11. Beam; 12. Support plate; 2. Battery pack; 21. Individual battery; 3. End plate; 31. First protrusion; 111. Snap-fit ​​part; 311. First stepped surface; 1111. Second stepped surface; 1112. First wall; 312. Second wall; Z, Third direction; 32. Rib; 313. Third stepped surface; 33. Plate; 34. Mounting base. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0043] In the description of this application, it should be understood that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In the description of this application, "multiple" means two or more, and "at least one" can refer to one, two, or more, unless otherwise explicitly specified. The terms "first," "second," and "third," etc., are only for the convenience of description and are used to name parts or embodiments by number, and do not imply any order of importance between the parts or embodiments.

[0044] It should also be noted that in the accompanying drawings of this application, arrows marked X indicate a first direction or its opposite, arrows marked Y indicate a second direction or its opposite, and arrows marked Z indicate a third direction or its opposite. The introduction of the first direction X, the second direction Y, and the third direction Z in the description of this application is to more clearly define the structure and relative positional relationships of the components in a battery pack and electrical device. In actual implementation, the third direction Z is generally a vertical direction or height direction, and the first direction X and the second direction Y are generally horizontal directions. The first direction X, the second direction Y, and the third direction Z intersect each other. Optionally, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other to optimize the layout of a battery pack and electrical device.

[0045] In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, the range of included angles from 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of completely parallel angles from 10° is considered parallel.

[0046] In the preamble of this application, in the field of power battery manufacturing, with continuous technological advancements and the market's pursuit of cost-effectiveness, the traditional process of large module gap insertion and the use of structural adhesive to bond side panels has gradually been replaced by more economical and efficient solutions. Currently, to reduce manufacturing costs, the industry generally adopts extrusion insertion technology and uses high-performance adhesive materials as the bonding method between modules. However, while this change saves costs, it also brings new challenges. Specifically, because the pre-tightening force between the casing and the battery pack is not effectively enhanced, the battery pack is prone to instability within the casing when vibration occurs during battery pack use, which may lead to displacement and relative sliding of the battery pack. This not only reduces the overall integrity and structural stability of the battery pack but may also cause cell damage due to uneven stress between battery packs, affecting battery performance and lifespan.

[0047] In view of this, embodiments of this application provide a battery pack aimed at solving at least one of the above-mentioned technical problems.

[0048] Please see Figures 1 to 10 As shown, the battery pack of this embodiment includes a housing 1, a battery pack 2, and an end plate 3. The housing 1 has intersecting first direction X and second direction Y, and a receiving cavity 10. The housing 1 includes a beam 11 and a supporting plate 12. The beam 11 intersects the first direction X and extends along the second direction Y. The beam 11 is connected to the supporting plate 12 and forms the receiving cavity 10. The battery pack 2 is disposed within the receiving cavity 10 and includes multiple individual batteries 21 arranged along the first direction X. The end plate 3 is disposed within the receiving cavity 10, located on one side of the battery pack 2 in the first direction X, and connects the battery pack 2 to the beam 11. One of the end plate 3 and the beam 11 has a first protrusion 31, and the other has a snap-fit ​​portion 111. The first protrusion 31 is at least partially embedded in the snap-fit ​​portion 111. The battery pack 2 is connected to the beam 11 by the end plate 3. A first protrusion 31 is provided on one of the end plate 3 and the beam 11, and a snap-fit ​​part 111 is provided on the other. The first protrusion 31 is at least partially embedded in the snap-fit ​​part 111. This ensures that when the battery pack 2 is squeezed into the box, the end plate 3 can tightly engage with the box 1, thereby limiting the position of the battery pack 2. This makes the connection between the box 1 and the battery pack 2 more stable and stronger. It optimizes the connection method between the battery pack 2 and the box 1, reduces the performance degradation and safety hazards of the battery pack caused by the loose assembly of the battery pack 2, and improves the stability and safety of the battery pack.

[0049] In this application, the end plate 3 is made of insulating material. Before the battery pack 2 is assembled into the box, multiple individual cells 21 can be bonded together to form a battery pack 2 using a high-performance adhesive material. The end plate 3 is then bonded to either side of the battery pack 2 along the first direction X, completing the preparatory steps before assembly into the box. It should be understood that the number of battery packs 2 is not limited, as shown in the appendix to this application. Figure 1 and attached Figure 2 As shown, only a portion of the battery pack 2 is illustrated in the housing 1, but battery pack 2 can be arranged on both sides along the second direction Y to increase the battery capacity of the battery pack. For ease of explanation, the housing method of this application only uses a portion of the battery pack 2 as an example. Of course, when there are many battery packs 2, multiple packs can be combined and assembled into a whole housing. It should be understood that the snap-fit ​​part 111 in this application can be a groove or a solid with a receiving space, including but not limited to a hook, for the first protrusion 31 to be partially inserted. The first protrusion 31 can be a protrusion, and when the snap-fit ​​part 111 is a hook-shaped structure, the first protrusion 31 can also be a hook-shaped structure.

[0050] Please see Figures 4 to 7As shown, in some embodiments, a first protrusion 31 protrudes from the end plate 3 on the side facing the beam 11, and a snap-fit ​​portion 111 is provided on the side of the beam 11 facing the end plate 3. The first protrusion 31 has a first stepped surface 311, which is located on the side of the first protrusion 31 away from the support plate 12. The snap-fit ​​portion 111 has a second stepped surface 1111, which is located on the side of the snap-fit ​​portion 111 facing the support plate 12. The first stepped surface 311 and the second stepped surface 1111 are at least partially opposite to each other so that the first stepped surface 311 can contact the second stepped surface 1111. After the battery pack 2 is assembled into the box, the end plate 3 and the beam 11 are limited by the first step surface 311 and the second step surface 1111. This allows the first step surface 311 and the second step surface 1111 to abut against each other when the battery pack vibrates during use. This ensures that there is sufficient pre-tightening force between the battery pack 2 and the box body 1, effectively preventing excessive amplitude of vibration in the battery pack. This improves the overall integrity and structural stability of the battery pack, avoids uneven force on the battery pack 2 which could cause battery damage, ensures battery performance and lifespan, and ultimately improves the overall performance, durability and safety of the battery pack.

[0051] Please see Figure 8As shown, in some embodiments, the snap-fit ​​portion 111 further includes a first wall 1112, located on the side of the snap-fit ​​portion 111 facing the end plate 3, and the first wall 1112 and the second step surface 1111 have an included angle α, satisfying: 30°≤α≤90°; the first protrusion 31 further includes a second wall 312, located on the side of the first protrusion 31 facing the beam 11, and the second wall 312 and the first step surface 311 have an included angle b, satisfying 30°≤b≤90°. It should be understood that in 30°≤α≤90° and 30°≤b≤90°, the angles α and β can be equal or unequal, and α and β can be measured using an angle ruler or an angle measuring instrument. Specifically, 'a' can be any angle or a range between any two angles from 90°, 85°, 80°, 75°, 70°, 65°, 60°, 55°, 50°, 45°, 40°, 35°, and 30°. Similarly, 'b' can be any angle or a range between any two angles from 90°, 85°, 80°, 75°, 70°, 65°, 60°, 55°, 50°, 45°, 40°, 35°, and 30°. When the angles formed by the first wall 1112 and the second step surface 1111, and the angles formed by the second wall 312 and the first step surface 311 are both within the range of 30° to 90°, a more stable limiting position can be formed between the first protrusion 31 and the locking part 111. On the one hand, this can reduce the risk of slippage between the first protrusion 31 and the locking part 111 caused by an excessively large angle between a and b. On the other hand, it can reduce the risk of an inability to form an effective locking fit between the first protrusion 31 and the locking part 111 when the end plate 3 vibrates during assembly or battery pack use due to an excessively small angle between a and b.

[0052] Meanwhile, when the battery pack vibrates during use, the end plate 3 may tend to move relative to the beam 11 toward the side away from the support plate 12. The first protrusion 31 and the snap-fit ​​part 111 form a special angle limit (that is, the first wall 1112 and the second step surface 1111 form an angle greater than or equal to 30° and less than or equal to 90°, and the second wall 312 and the first step surface 311 form an angle greater than or equal to 30° and less than or equal to 90°). This decomposes the force acting on the first step surface 311 and the second step surface 1111 into a force in the height direction and a force in the horizontal direction, reducing the pressure exerted by the first protrusion 31 on the second step surface 1111, avoiding excessive stress on the beam 11 and causing local deformation, reducing the risk of the end plate 3 slipping off, ensuring the reliability of the battery pack structure, and the overall stability of the battery pack.

[0053] Please see Figure 4 and Figure 5As shown, in some embodiments, the housing 1 has a third direction Z, and the end plate 3 also includes a rib 32. The rib 32 and the first protrusion 31 are located on the same side of the end plate 3 and are distributed at intervals along the third direction Z. The rib 32 extends from the end plate 3 towards the direction where the beam 11 is located. Along the first direction, the size of the rib 32 is less than or equal to the size of the first protrusion 31. It should be understood that the rib 32 provided on the end plate 3 can be integrally injection molded by the end plate 3, or it can be connected by other conventional methods, such as bonding, or fixed connection by external connectors, or interference fit connection, which will not be described in detail here. By arranging the rib 32 on the end plate 3, the overall structural strength of the end plate 3 can be increased, and the resistance to deformation can be improved. At the same time, the rib 32 can abut against or abut against the beam 11, which increases the preload of the battery pack 2 in the first direction X, making the battery pack 2 less prone to instability and center of gravity shift when subjected to vibration in the third direction Z, thus ensuring the stability of the battery pack.

[0054] It should be understood that when the battery pack 2 and the end plate 3 are assembled and enter the housing, the beam 11 undergoes a certain deformation to ensure that the first protrusion 31 of the end plate 3 can smoothly cooperate with the snap-fit ​​part 111, that is, the first protrusion 31 can be embedded in the snap-fit ​​part 111.

[0055] Please refer to the following: Figure 4 , Figure 5 and Figure 7 As shown, in some embodiments, the end plate 3 includes a plurality of ribs 32, which are spaced apart along a third direction Z. At least one rib 32 is located on the side of the first protrusion 31 away from the support plate 12, and at least one rib 32 is located between the first protrusion 31 and the support plate 12. In some embodiments, each rib 32 extends along a second direction Y on the end plate 3. In other embodiments, each rib 32 extends along a third direction Z on the end plate 3. In some embodiments, the ribs 32 are staggered in the YZ plane, that is, some ribs 32 extend along the second direction Y, and some ribs 32 extend along a third direction Z. By providing a plurality of ribs 32, on the one hand, the overall structural strength of the end plate 3 is further increased, and the deformation resistance is improved. On the other hand, the end plate 3 and the beam 11 are in multi-point contact, resulting in higher overall stability, improved toughness, and better deformation resistance. Furthermore, the overall weight of the end plate 3 is reduced, the battery pack is lighter, materials are reduced, and costs are lowered. Furthermore, at least one rib 32 is located on the side of the first protrusion 31 away from the support plate 12, and at least one rib 32 is located between the first protrusion 31 and the support plate 12, so that both ends of the end plate 3 in the third direction Z can abut against or abut against the beam 11, thereby ensuring the connection stability between the beam 11 and the end plate 3, so that when the battery pack 2 vibrates during use, it is not easy to become unstable and cause the center of gravity to shift, thus ensuring the stability of the battery pack.

[0056] Please see Figures 7 to 10 As shown, in some embodiments, along the third direction Z, the battery pack 2 has a first dimension e mm, and the first step surface 311 and the support plate 12 have a maximum distance f mm, satisfying: 0.05≤f / e≤0.6; the first protrusion 31 also includes a third step surface 313, which is located on the side of the first protrusion 31 away from the first step surface 311, and along the third direction Z, the third step surface 313 and the support plate 12 have a minimum distance g mm, satisfying 2≤g≤20, and f>g.

[0057] Specifically, the first dimension e represents the height dimension of the battery pack 2, the maximum dimension f represents the farthest distance between the first step surface 311 and the support plate 12, and the minimum dimension g represents the closest distance between the third step surface 313 and the support plate 12.

[0058] Specifically, f / e can be any value from 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, or a range between any two values. g can be any value from 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or a range between any two values. When f / e is within the range of 0.05 to 0.6 and the first dimension e of the battery pack remains unchanged, a larger f / e means a larger f. If f is larger and g is larger, the first protrusion 31 will be further away from the support plate 12, and the center of gravity will increase accordingly. A higher center of gravity means that the battery pack will be less safe from impacts when subjected to third-direction Z-shaped bumps and vibrations. Conversely, if f is smaller and g is smaller, the first protrusion 31 will be closer to the support plate 12, the center of gravity will be lower, the stability of the battery pack will be higher, and the safety from impacts will be higher.

[0059] When f / e is within the range of 0.05 to 0.6, and f > g and 2 ≤ g ≤ 20, the end plate 3 and beam 11 can form a stable connection, and the battery pack has good stability and safety.

[0060] Please see Figure 5 As shown, in some embodiments, the end plate 3 further includes: a plate body 33, which is sandwiched between the battery pack 2 and the beam 11 and connected to the battery pack 2; a first protrusion 31 is connected to the plate body 33 and extends from the plate body 33 in the direction of the beam 11; along the first direction X, the plate body 33 has a second dimension h mm, satisfying: 2≤h≤10; the first protrusion 31 has a third dimension t mm, satisfying: 0.15≤t / h≤1.5; along the third direction Z, the first protrusion 31 has a maximum dimension d mm, satisfying: 2≤d≤f.

[0061] Specifically, the second dimension h represents the thickness of the plate 33, and h can be any value from 2, 3, 4, 5, 6, 7, 8, 9, 10 or a range between any two values. The third dimension t can represent the thickness of the first protrusion 31, and t / h can be any value from 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5 or a range between any two values. d can represent the maximum dimension of the first protrusion 31 in the third direction Z.

[0062] When 0.15≤t / h≤1.5, and 2≤h≤10 and 2≤d≤f, the end plate 3 and beam 11 can form a stable connection, and the battery pack has good stability and safety. Specifically, the thicker h of the plate 33, the greater the overall strength of the end plate 3; the greater the thickness t of the first protrusion 31, the more the first protrusion 31 is embedded in the snap-fit ​​part 111, and the higher the reliability of the connection between the end plate 3 and beam 11; the greater the maximum dimension d of the first protrusion 31 in the third direction Z, the higher the strength of the first protrusion 31, the less prone it is to deformation, and the higher the reliability of the connection between the end plate 3 and beam 11.

[0063] It should be understood that in the following embodiments of this application, a laser rangefinder or photoelectric sensor can be used to measure the dimensions of f, e, g, h, t, and d; in conjunction with GB 38031-2020 (Safety Requirements for Power Batteries for Electric Vehicles), the vibration frequency of the battery pack under a 12-hour vibration test is tested to meet the minimum requirement: after the vibration is completed, the vibration frequency of the battery pack needs to be above 50 Hz, and the higher the vibration frequency, the better the stability and safety of the battery pack under vibration environment.

[0064] The test results of the examples are shown in the table below:

[0065]

[0066]

[0067] As can be seen from the above embodiments: In embodiments 1 to 13, when f / e is in the range of 0.05-0.6 and g is in the range of 2-20, the ranges disclosed in the above embodiments all satisfy the requirement that the vibration frequency of the battery pack is above 50 Hz. This indicates that the battery pack has good stability and safety under vibration. In embodiments 29 and 30, when f / e is greater than 0.6 or less than 0.05, the vibration frequency of the battery pack decreases, approaching or reaching the lower limit value. This indicates that the stability and safety of the battery pack under vibration are somewhat reduced. In embodiments 14 to 28, when t / h is in the range of 0.15-1.5, h is in the range of 2-10, and d is in the range of 2-f, the ranges disclosed in the above embodiments all satisfy the requirement that the vibration frequency of the battery pack is above 50 Hz. Wherein, keeping h constant, if t is larger and d is larger, the overall strength of the end plate 3 is greater, the connection between the end plate 3 and the beam 11 is more stable, and the battery pack has better safety and stability under bumpy vibration. In Examples 31 and 32, when t / h is less than 0.15 or greater than 1.5, and d is less than 2 or greater than f, the vibration frequency of the battery pack decreases and approaches or reaches the lower limit value. It can be seen that the stability and safety of the battery pack under vibration environment are reduced.

[0068] In some embodiments, the end plate 3 further includes a mounting base 34, which is disposed at the end of the plate body 33 away from the supporting plate 12 and extends toward the side of the plate body 33 away from the battery pack 2. The mounting base 34 is connected to the plate body 33. It should be understood that the mounting base 34 integrated on the end plate 3 has mounting holes for mounting a high-voltage base. The high-voltage base is mounted on the mounting base, which can reduce the assembly error between the charging control system (CCS), the battery pack 2 and the mounting base 34, reduce the dimensional misalignment between the busbar and the terminal observation hole, and reduce the welding burst problem caused by welding trajectory misalignment. It has high overall flexibility.

[0069] In some embodiments, end plates 3 are sandwiched between the battery pack 2 and the housing 1 on both sides in the first direction X. By providing end plates 3 on both sides of the battery pack 2 along the first direction X, the pre-tightening force between the battery pack 2 and the housing 1 is further improved, ensuring that the end plates 3 can tightly engage with the housing 1 when the battery pack 2 is squeezed into the housing, thereby achieving a more reliable limit on the battery pack 2. The connection between the housing 1 and the battery pack 2 is more stable and has greater connection strength, making it less likely for the battery pack 2 to become unstable and cause a shift in the center of gravity when subjected to vibration in the third direction Z, thus improving the stability and safety of the battery pack and reducing the risk of failure.

[0070] In some embodiments, the bottom of the first protrusion 31 and the rib 32 are provided with chamfers, which are directed toward the beam 11 to reduce the assembly difficulty of the end plate 3, increase the guide feature (i.e., the chamfer) to have smaller requirements for the box gap, improve the box entry accuracy, and improve the assembly efficiency of the battery pack.

[0071] This application also discloses an electrical device including a battery pack as described in the above embodiments. Therefore, the electrical device of this application can possess all the technical features and effects of the aforementioned battery pack, which will not be repeated here.

[0072] The above description of the embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application; those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, include: A box (1) having intersecting first direction (X) and second direction (Y) and having a receiving cavity (10), the box (1) including a beam (11) and a support plate (12), the beam (11) intersecting the first direction (X) and extending along the second direction (Y), the beam (11) being connected to the support plate (12) and used to enclose the receiving cavity (10); A battery pack (2) is disposed in the receiving cavity (10) and includes a plurality of individual cells (21) arranged along the first direction (X); An end plate (3) is disposed in the receiving cavity (10). The end plate (3) is disposed on one side of the battery pack (2) in the first direction (X) and connects the battery pack (2) and the beam (11) respectively. One of the end plate (3) and the beam (11) is provided with a first protrusion (31) and the other is provided with a snap-fit ​​part (111), wherein the first protrusion (31) is at least partially embedded in the snap-fit ​​part (111).

2. The battery pack according to claim 1, characterized in that, The first protrusion (31) protrudes from the end plate (3) on the side facing the beam (11), and the snap-fit ​​part (111) is provided on the side of the beam (11) facing the end plate (3). The first protrusion (31) has a first stepped surface (311), and the first stepped surface (311) is located on the side of the first protrusion (31) away from the support plate (12). The snap-fit ​​portion (111) has a second stepped surface (1111), which is located on the side of the snap-fit ​​portion (111) facing the support plate (12); The first step surface (311) and the second step surface (1111) are at least partially opposite to each other so that the first step surface (311) and the second step surface (1111) can contact each other.

3. The battery pack according to claim 2, characterized in that, The snap-fit ​​part (111) further includes a first wall (1112), the first wall (1112) is located on the side of the snap-fit ​​part (111) facing the end plate (3), and the first wall (1112) and the second step surface (1111) have an angle α, satisfying: 30°≤α≤90°; The first protrusion (31) also includes a second wall (312), which is located on the side of the first protrusion (31) facing the beam (11). The second wall (312) has an angle b with the first step surface (311) such that 30°≤b≤90°.

4. The battery pack according to claim 1, characterized in that, The housing (1) has a third direction (Z), and the end plate (3) further includes: The rib (32) and the first protrusion (31) are located on the same side of the end plate (3) and are distributed at intervals along the third direction (Z). The rib (32) extends from the end plate (3) toward the beam (11). Along the first direction (X), the size of the rib (32) is less than or equal to the size of the first protrusion (31).

5. The battery pack according to claim 4, characterized in that, The end plate (3) includes a plurality of ribs (32), which are arranged at intervals along the third direction (Z), and at least one rib (32) is located on the side of the first protrusion (31) away from the support plate (12), and at least one rib (32) is located between the first protrusion (31) and the support plate (12).

6. The battery pack according to claim 2, characterized in that, The housing (1) has a third direction (Z), the third direction (Z), the first direction (X) and the second direction (Y) intersect each other, along the third direction (Z), the battery pack (2) has a first dimension e mm, and the first step surface (311) and the support plate (12) have a maximum distance f mm, satisfying: 0.05≤f / e≤0.6; The first protrusion (31) further includes a third step surface (313), which is located on the side of the first protrusion (31) away from the first step surface (311) along the third direction (Z). The third step surface (313) and the support plate (12) have a minimum distance g mm, which satisfies 2≤g≤20 and f>g.

7. The battery pack according to claim 1, characterized in that, The end plate (3) also includes: Plate (33), which is sandwiched between the battery pack (2) and the beam (11) and connected to the battery pack (2); The first protrusion (31) is connected to the plate (33) and extends from the plate (33) toward the beam (11); Along the first direction (X), the plate (33) has a second dimension h mm, satisfying: 2≤h≤10, and the first protrusion (31) has a third dimension t mm, satisfying: 0.15≤t / h≤1.5; Along the third direction (Z), the first protrusion (31) has a maximum size d mm, which satisfies: 2≤d≤f.

8. The battery pack according to claim 7, characterized in that, The end plate (3) further includes a mounting base (34), which is disposed at one end of the plate body (33) away from the support plate (12) and extends toward the side of the plate body (33) away from the battery pack (2). The mounting base (34) is connected to the plate body (33).

9. The battery pack according to claim 1, characterized in that, The battery pack (2) has end plates (3) sandwiched between the beam (11) on both sides in the first direction (X).

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

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