Battery pack and electric equipment

Abstract

The utility model relates to the technical field of power batteries, in particular to a battery pack and electric equipment, the battery pack comprises a box body, a cold plate and a battery monomer assembly, the box body comprises an edge beam and a middle beam, the cold plate is arranged below the box body, the edge beam, the middle beam and the cold plate define a containing cavity, the battery monomer assembly is arranged in the containing cavity, and the battery monomer assembly is arranged in the containing cavity. The inner wall of each side beam is provided with a first inclined part which gradually inclines towards the containing cavity in the direction away from the cold plate, and each middle beam is provided with a second inclined part which gradually inclines towards the containing cavity in the direction away from the cold plate. The battery cell assembly includes a third inclined portion at least partially abutting against the first inclined portion and a fourth inclined portion at least partially abutting against the second inclined portion. The anti-degumming device can prevent the battery cell from degumming and improve the safety.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field, specifically provide a battery pack and electrical equipment. BACKGROUND

[0002] With the popularization of new energy vehicles, lithium batteries are used more and more commonly in new energy vehicles. Generally, many single lithium batteries are connected in series to form a battery string, and connected in parallel to form a large battery pack. In the existing CTP battery pack, the adhesion between the battery cell and the cold plate will appear delamination in the extreme vibration and impact working condition. Once delamination occurs, it will affect the reliability of the battery, and further affect the safety of the battery pack.

[0003] Therefore, there is a need in the art for a new technical solution to solve the above problems. SUMMARY

[0004] The utility model aims at solving above-mentioned technical problem, provides a new battery pack that can prevent the delamination of battery cell and improve safety.

[0005] The utility model provides a battery pack, which comprises:

[0006] The box body comprises a side beam and an intermediate beam;

[0007] The cold plate is arranged below the box body, and the side beam, the intermediate beam and the cold plate form a receiving cavity;

[0008] The battery monomer assembly is arranged in the receiving cavity;

[0009] The inner wall of the side beam has a first inclined portion, which gradually inclines towards the receiving cavity in a direction away from the cold plate. The intermediate beam has a second surface, which gradually inclines towards the receiving cavity in a direction away from the cold plate. The battery monomer assembly comprises a third inclined portion at least partially abutting the first inclined portion and a fourth inclined portion at least partially abutting the second surface.

[0010] In the above technical solution, the first inclined portion of the side beam is inclined, and the second inclined portion of the intermediate beam is inclined. The battery monomer assembly, the side beam and the intermediate beam are inclined, the abutting surfaces of the first inclined portion and the third inclined portion, and the abutting surfaces of the second inclined portion and the fourth inclined portion are all inclined from bottom to top and towards the receiving cavity. When the battery pack is subjected to vibration and impact, the battery monomer assembly will move upwards, the abutting surfaces of the first inclined portion and the third inclined portion, and the abutting surfaces of the second inclined portion and the fourth inclined portion will be subjected to inclined force, and the third inclined portion and the fourth inclined portion will be subjected to downward reaction force, thereby limiting the battery monomer assembly and preventing delamination of the battery monomer assembly, thereby improving the safety of the battery pack.

[0011] In the preferred embodiment of the above-mentioned battery pack, the battery cell assembly includes a battery pack and an end plate. The battery pack includes a plurality of battery cells arranged along a first direction. The end plate includes a first end plate and a second end plate. The first end plate is disposed between the side beam and the battery pack, and the second end plate is disposed between the middle beam and the battery pack. The first end plate and the second end plate are arranged along the first direction.

[0012] When the above technical solution is adopted, the first end plate and the second end plate are arranged along the first direction, that is, the contact surfaces of the first inclined portion and the third inclined portion and the contact surfaces of the second inclined portion and the fourth inclined portion are arranged along the first direction. Adjacent battery cells are glued together. The side beam and the middle beam abut against the first end plate and the second end plate on the large surface of the battery cell, which not only facilitates the assembly of the battery cell assembly, but also has a good limiting effect.

[0013] In the preferred embodiment of the above-mentioned battery pack, the contact area between the first inclined portion and the third inclined portion is 30% to 100% of the area of ​​the first inclined portion or the area of ​​the third inclined portion.

[0014] When the above technical solution is adopted, the contact area between the first inclined part and the third inclined part is too small, which is not conducive to the contact of the contact surfaces. When the battery pack is subjected to vibration and impact, the battery cell assembly is subjected to an upward force. The upward force at the contact point between the first inclined part and the third inclined part is greater than the downward reaction force at the contact point, which makes it impossible to effectively limit the battery cell assembly. However, a larger contact area can effectively limit the battery cell assembly and prevent the battery cell assembly from delaminating, thereby improving the safety of the battery pack.

[0015] In the preferred embodiment of the above-mentioned battery pack, the contact area between the second inclined portion and the fourth inclined portion is 30% to 100% of the area of ​​the second inclined portion or the area of ​​the fourth inclined portion.

[0016] When the above technical solution is adopted, the contact area between the second inclined part and the fourth inclined part is too small, which is not conducive to the contact of the contact surfaces. When the battery pack is subjected to vibration and impact, the battery cell assembly is subjected to an upward force. The upward force at the contact point between the second inclined part and the fourth inclined part is greater than the downward reaction force at the contact point, which makes it impossible to effectively limit the battery cell assembly. However, a larger contact area can effectively limit the battery cell assembly and prevent the battery cell assembly from delaminating, thereby improving the safety of the battery pack.

[0017] In the preferred embodiment of the above-mentioned battery pack, the tilt angle of the first tilted portion and / or the third tilted portion is 0.1 degrees to 5 degrees, and the tilt angle of the second tilted portion and / or the fourth tilted portion is 0.1 degrees to 5 degrees.

[0018] When the above technical solution is adopted, the tilt angle of the first tilting part and / or the third tilting part is 0.1 degrees to 5 degrees, and the tilt angle of the second tilting part and / or the fourth tilting part is 0.1 degrees to 5 degrees. This not only facilitates the assembly of battery cells into the box, but also prevents the clamping force of the tooling on the battery cells from exceeding the safety threshold of the battery cells during assembly, ensuring that the battery cells are not damaged, extending the service life of the battery cells, and improving the safety of the battery pack. In addition, it allows the side beams and the middle beams to have a better limiting effect on the battery cells, which can solve the problem of the bottom of the battery cells delaminating under extreme conditions of vibration and impact, thereby improving the safety of the battery pack.

[0019] In the preferred embodiment of the above-mentioned battery pack, the first end plate has a first groove on the side away from the side beam that is away from the battery pack, and the second end plate has a second groove on the side away from the middle beam that is away from the battery pack.

[0020] When the above technical solution is adopted, the first end plate is provided with a first groove away from the battery pack, and the second end plate is provided with a second groove away from the battery pack. When the battery cell expands, it can serve as a buffer space for the expanded part. The groove absorbs the expansion of the battery cell and prevents the battery cell assembly from being damaged due to expansion.

[0021] In the preferred embodiment of the above-mentioned battery pack, a first adhesive member is provided between the first groove and the outline of the first end plate for bonding with the battery pack, and a second adhesive member is provided between the second groove and the outline of the second end plate for bonding with the battery pack.

[0022] With the above technical solution, the first adhesive and the second adhesive are provided so that the first end plate is bonded to the battery pack and the second end plate is bonded to the battery pack. When the battery pack is subjected to vibration and impact, the battery pack and the end plate have good adhesion and will not move relative to each other. At the same time, there will be no problem of the bottom of the battery cell assembly delaminating, which improves the safety of the battery.

[0023] In the preferred embodiment of the above-mentioned battery pack, the first end plate connects at least two battery packs, and the at least two battery packs are arranged along a second direction, which is perpendicular to the first direction.

[0024] With the above technical solution, at least two battery packs are connected through an end plate. When the battery packs and the end plate are subjected to vibration and impact, the contact area between the end plate and the battery packs is large, which can increase the connection strength between the battery packs and the end plate and the cold plate. A large peeling force is required to de-adhere the battery cell assembly to the cold plate, which improves the problem of de-adhesion between the battery cell assembly and the cold plate, thereby improving the safety of the battery pack.

[0025] In the preferred embodiment of the above-mentioned battery pack, a third adhesive is provided between the battery cell assembly and the cold plate, and a fourth adhesive is provided between two adjacent battery cells.

[0026] When the above technical solution is adopted, the setting of the third and fourth adhesive components can ensure that when the battery pack is subjected to extreme conditions of vibration and impact, the battery cell assembly and the cold plate are bonded together by the third adhesive component and will not delaminate. At the same time, there will be no relative movement between the battery cells, thus extending the service life of the battery pack.

[0027] In a second aspect, the present invention provides an electrical device including the battery pack described in the second aspect. Attached Figure Description

[0028] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0029] Figure 1 This is a top view of the battery pack of this utility model;

[0030] Figure 2 This is a structural schematic diagram of the box body and end plate of this utility model;

[0031] Figure 3 This is a structural schematic diagram of the side beam and the first end plate of this utility model;

[0032] Figure 4 This is a structural schematic diagram of the middle beam and the second end plate of this utility model.

[0033] Reference signs:

[0034] 1. Box body; 11. Side beam; 110. First inclined section; 12. Middle beam; 120. Second inclined section; 13. Receiving cavity;

[0035] 2. Battery cell assembly; 21. Battery pack; 211. Battery cell;

[0036] 3. Cold-rolled steel plate; 31. Top surface;

[0037] 4. End plate; 41. First end plate; 410. Third inclined portion; 411. First groove; 412. First end plate outline; 413. First adhesive component; 42. Second end plate; 420. Fourth inclined portion; 421. Second groove; 422. Second end plate outline; 423. Second adhesive component;

[0038] α, Angle between the edge beam and the cold plate; β, Angle between the middle beam and the cold plate. Detailed Implementation

[0039] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0040] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "connection," "setting," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] like Figures 1 to 4 As shown, in a first aspect, the battery pack of this utility model includes a housing 1, a cold plate 3, and a battery cell assembly 2. The housing 1 includes a side beam 11 and a middle beam 12. The cold plate 3 is disposed below the housing 1. The side beam 11, the middle beam 12, and the cold plate 3 surround to form a receiving cavity 13. The battery cell assembly 2 is received in the receiving cavity 13. The inner wall of the side beam 11 has a first inclined portion 110. The first inclined portion 110 gradually tilts toward the receiving cavity 13 in a direction away from the cold plate 3. The middle beam 12 has a second inclined portion 120. The second inclined portion 120 gradually tilts toward the receiving cavity 13 in a direction away from the cold plate 3. The battery cell assembly 2 includes a third inclined portion 410 that at least partially abuts against the first inclined portion 110 and a fourth inclined portion 420 that at least partially abuts against the second inclined portion 120.

[0043] The first inclined portion 110 of the side beam 11 of this utility model is inclined, that is, the first inclined portion 110 is wider at the top and narrower at the bottom. The second inclined portion 120 of the middle beam 12 is also inclined, that is, the second inclined portion 120 is wider at the top and narrower at the bottom. This allows the battery cell assembly 2, the side beam 11, and the middle beam 12, which are installed in the receiving cavity 13, to be inclined. The contact surfaces of the first inclined portion 110 and the third inclined portion 410, and the contact surfaces of the second inclined portion 120 and the fourth inclined portion 420, are all inclined from bottom to top and toward the receiving cavity 13. When the battery pack is subjected to vibration and impact, the battery cell assembly 2 will move upward. The contact surfaces of the first inclined portion 110 and the third inclined portion 410, and the contact surfaces of the second inclined portion 120 and the fourth inclined portion 420 will be subjected to an inclined force, while the third inclined portion 410 and the fourth inclined portion 420 will be subjected to a downward reaction force. This will limit the battery cell assembly 2 and prevent the battery cell assembly 2 from delaminating, thereby improving the safety of the battery pack.

[0044] like Figures 1 to 2 As shown, the battery cell assembly 2 of this utility model includes a battery pack 21 and an end plate 4. The end plate 4 includes a first end plate 41 and a second end plate 42. The first end plate 41 is disposed between the side beam 11 and the battery pack 21, and the second end plate 42 is disposed between the middle beam 12 and the battery pack 21. The battery pack 21 includes a plurality of battery cells 21 arranged along the first direction X. The first end plate 41 and the second end plate 42 are arranged along the first direction X, that is, the contact surfaces of the first inclined portion 110 and the third inclined portion 410 and the contact surfaces of the second inclined portion 120 and the fourth inclined portion 420 are arranged along the first direction X. Adjacent battery cells 21 are glued together. The side beam 11 and the middle beam 12 abut against the first end plate 41 and the second end plate 42 on the large surface of the battery cell 21, which not only facilitates the assembly of the battery cell assembly 2, but also has a good limiting effect.

[0045] like Figures 2 to 3As shown, the contact area between the first inclined portion 110 and the third inclined portion 410 is 30% to 100% of the area of ​​the first inclined portion 110 or 30% to 100% of the area of ​​the third inclined portion 410. In this embodiment, it can be 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100%. Preferably, the contact area between the first inclined portion 110 and the third inclined portion 410 is 80% of the area of ​​the first inclined portion 110. The small contact area between the first inclined portion 110 and the third inclined portion 410 is not conducive to the contact of the contact surfaces. When the battery pack is subjected to vibration and impact, the battery cell assembly 2 is subjected to an upward force. The upward force at the contact point between the first inclined portion 110 and the third inclined portion 410 is greater than the downward reaction force at the contact point, thus failing to effectively limit the battery cell assembly 2. However, a larger contact area can effectively limit the battery cell assembly 2 and prevent the battery cell assembly 2 from delaminating, thereby improving the safety of the battery pack.

[0046] like Figure 2 and Figure 4 As shown, the contact area between the second inclined portion 120 and the fourth inclined portion 420 is 30% to 100% of the area of ​​the second inclined portion 120 or 30% to 100% of the area of ​​the fourth inclined portion 420. In this embodiment, it can be 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100%. Preferably, the contact area between the second inclined portion 120 and the fourth inclined portion 420 is 90% of the area of ​​the second inclined portion 120. The small contact area between the second inclined portion 120 and the fourth inclined portion 420 is not conducive to the contact of the contact surfaces. When the battery pack is subjected to vibration and impact, the battery cell assembly 2 is subjected to an upward force. The upward force at the contact point between the second inclined portion 120 and the fourth inclined portion 420 is greater than the downward reaction force at the contact point, thus failing to effectively limit the battery cell assembly 2. However, a larger contact area can effectively limit the battery cell assembly 2 and prevent the battery cell assembly 2 from delaminating, thereby improving the safety of the battery pack.

[0047] like Figures 3 to 4As shown, the angle α between the side beam 11 and the cold plate 3, that is, the angle between the first inclined portion 110 of the side beam 11 and the upper surface 31 of the cold plate 3, is α, where α < 90 degrees. The inclination angle of the first inclined portion 110 and / or the third inclined portion 410 is 0.1 degrees to 5 degrees. α is complementary to the inclination angle of the first inclined portion 110 and / or the third inclined portion 410. In this embodiment, the inclination angle of the first inclined portion 110 can be 0.1 degrees or 0. The inclination angles are 2 degrees, 0.4 degrees, 0.6 degrees, 0.8 degrees, 1 degree, 1.2 degrees, 1.4 degrees, 1.6 degrees, 1.8 degrees, 2 degrees, 2.2 degrees, 2.4 degrees, 2.6 degrees, 2.8 degrees, 3 degrees, 3.2 degrees, 3.4 degrees, 3.6 degrees, 3.8 degrees, 4 degrees, 4.2 degrees, 4.4 degrees, 4.6 degrees, 4.8 degrees, and 5 degrees; or, the inclination angle of the third inclined part 410 can be 0.1 degrees, 0.2 degrees, or 0.4 degrees. 0.6 degrees, 0.8 degrees, 1 degree, 1.2 degrees, 1.4 degrees, 1.6 degrees, 1.8 degrees, 2 degrees, 2.2 degrees, 2.4 degrees, 2.6 degrees, 2.8 degrees, 3 degrees, 3.2 degrees, 3.4 degrees, 3.6 degrees, 3.8 degrees, 4 degrees, 4.2 degrees, 4.4 degrees, 4.6 degrees, 4.8 degrees, 5 degrees; or, the tilt angles of the first tilting part 110 and the third tilting part 410 are both 0.1 degrees, 0.2 degrees, 0 ... The inclination angles are 0.4 degrees, 0.6 degrees, 0.8 degrees, 1 degree, 1.2 degrees, 1.4 degrees, 1.6 degrees, 1.8 degrees, 2 degrees, 2.2 degrees, 2.4 degrees, 2.6 degrees, 2.8 degrees, 3 degrees, 3.2 degrees, 3.4 degrees, 3.6 degrees, 3.8 degrees, 4 degrees, 4.2 degrees, 4.4 degrees, 4.6 degrees, 4.8 degrees, and 5 degrees. Preferably, the inclination angle of the first inclined portion 110 and / or the third inclined portion 410 is 0.57 degrees. The tilt angle of the first tilting part 110 and / or the third tilting part 410 is 0.1 degrees to 5 degrees. This not only facilitates the assembly of the battery cell assembly 2 into the box, but also prevents the clamping force of the tooling on the battery cell assembly 2 from exceeding the safety threshold of the battery cell assembly 2 during the box assembly process. This ensures that the battery cell 21 is not damaged, extends the service life of the battery cell 21, and improves the safety of the battery pack. In addition, it allows the side beam 11 and the middle beam 12 to have a better limiting effect on the battery cell assembly 2, which can solve the problem of the bottom of the battery cell assembly 2 delaminating under extreme working conditions of vibration and impact, thereby improving the safety of the battery pack.

[0048] like Figures 3 to 4As shown, the angle β between the intermediate beam 12 and the cold plate 3, that is, the angle between the second inclined portion 120 of the intermediate beam 12 and the upper surface 31 of the cold plate 3, is β < 90 degrees. The inclination angle of the second inclined portion 120 and / or the fourth inclined portion 420 is 0.1 degrees to 5 degrees. β is complementary to the inclination angle of the second inclined portion 120 and / or the fourth inclined portion 420. In this embodiment, the inclination angle of the second inclined portion 120 can be 0.1 degrees, 0.2 degrees, 0.4 degrees, 0.6 degrees, 0.8 degrees, 1 degree, 1.2 degrees, 1.4 degrees, 1.6 degrees, 1.8 degrees, 2 degrees, 2.2 degrees, 2.4 degrees, 2.6 degrees, 2.8 degrees, 3 degrees, 3.2 degrees, 3.4 degrees, 3.6 degrees, 3.8 degrees, 4 degrees, 4.2 degrees, 4.4 degrees, 4.6 degrees, 4.8 degrees, 5 degrees; or, the tilt angle of the fourth tilting part 420 can be 0.1 degrees, 0.2 degrees, 0. 4 degrees, 0.6 degrees, 0.8 degrees, 1 degree, 1.2 degrees, 1.4 degrees, 1.6 degrees, 1.8 degrees, 2 degrees, 2.2 degrees, 2.4 degrees, 2.6 degrees, 2.8 degrees, 3 degrees, 3.2 degrees, 3.4 degrees, 3.6 degrees, 3.8 degrees, 4 degrees, 4.2 degrees, 4.4 degrees, 4.6 degrees, 4.8 degrees, 5 degrees; or, the tilt angles of the second tilting part 120 and the fourth tilting part 420 are both 0.1 degrees, 0.2 degrees, and 5 degrees. The inclination angles are 0.4 degrees, 0.6 degrees, 0.8 degrees, 1 degree, 1.2 degrees, 1.4 degrees, 1.6 degrees, 1.8 degrees, 2 degrees, 2.2 degrees, 2.4 degrees, 2.6 degrees, 2.8 degrees, 3 degrees, 3.2 degrees, 3.4 degrees, 3.6 degrees, 3.8 degrees, 4 degrees, 4.2 degrees, 4.4 degrees, 4.6 degrees, 4.8 degrees, and 5 degrees. Preferably, the inclination angle of the second inclined portion 120 and / or the fourth inclined portion 420 is 0.57 degrees. The tilt angle of the second tilting part 120 and / or the fourth tilting part 420 is 0.1 degrees to 5 degrees. This not only facilitates the assembly of the battery cell assembly 2 into the box, but also prevents the clamping force of the tooling on the battery cell assembly 22 from exceeding the safety threshold of the battery cell assembly 22 during the box assembly process. This ensures that the battery cell 21 is not damaged, extends the service life of the battery cell 21, and improves the safety of the battery pack. In addition, it allows the side beam 11 and the middle beam 12 to have a better limiting effect on the battery cell assembly 2, which can solve the problem of the bottom of the battery cell assembly 2 delaminating under extreme working conditions of vibration and impact, thereby improving the safety of the battery pack.

[0049] like Figures 3 to 4 As shown, the first end plate 41 has a first groove 411 away from the side beam 11 on the side away from the battery pack 21, and the second end plate 42 has a second groove 421 away from the battery pack 21 on the side away from the middle beam 12. When the battery cell 21 expands, it can serve as a buffer space for the expanded part. The groove absorbs the expansion of the battery cell 21 and will not cause damage to the battery cell assembly 2 due to expansion.

[0050] like Figures 3 to 4As shown, a first adhesive member 413 for bonding with the battery pack 21 is provided between the first groove 411 and the first end plate outline 412, and a second adhesive member 423 for bonding with the battery pack 21 is provided between the second groove 421 and the second end plate outline 422. The arrangement of the first adhesive member 413 and the second adhesive member 423 makes the first end plate 41 bonded to the battery pack 21 and the second end plate 42 bonded to the battery pack 21. When the battery pack is subjected to vibration and impact, the battery cell assembly 2 has good adhesion and will not move relative to each other. At the same time, there will be no problem of the bottom of the battery cell assembly 2 delaminating, which improves the safety of the battery.

[0051] like Figures 1 to 2 As shown, the first end plate 41 connects at least two battery packs 21, which are arranged along a second direction Y, perpendicular to the first direction X. The end plate 4 connects to the at least two battery packs 21. When the battery cell assembly 2 is subjected to vibration and impact, the contact area between the end plate 4 and the battery pack 21 is large, increasing the connection strength between the battery pack 21, the end plate 4, and the cold plate 3. This requires a larger peeling force to de-adhere the battery cell assembly 2 to the cold plate 3, thus improving the battery pack's safety. A third adhesive (not shown) is provided between the battery cell assembly 2 and the cold plate 3, and a fourth adhesive (not shown) is provided between two adjacent battery cells 21. The third and fourth adhesives ensure that even under extreme vibration and impact conditions, the battery cell assembly 2 and the cold plate 3 remain bonded together and will not de-adhere. Simultaneously, the battery cells 21 will not move relative to each other, extending the battery pack's lifespan.

[0052] In a second aspect, the electrical device of this utility model includes the battery pack of the first aspect. The electrical device of this technical solution includes the battery pack of any technical solution of this utility model, and therefore possesses all the technical effects of the battery pack of any technical solution of this utility model.

[0053] It should be noted that the above preferred embodiments are merely illustrative of the principles of this utility model and are not intended to limit the scope of protection of this utility model. Without departing from the principles of this utility model, those skilled in the art can adjust the above-described settings to make this utility model applicable to more specific application scenarios.

[0054] Of course, the alternative implementation methods described above, as well as the alternative implementation methods and preferred implementation methods, can be used in combination to create new implementation methods that are suitable for more specific application scenarios.

[0055] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A battery pack, characterized by, The battery pack comprises: a box body comprising a side beam and a middle beam; a cold plate arranged below the box body, the side beam, the middle beam and the cold plate forming a receiving cavity; a battery cell assembly arranged in the receiving cavity; wherein an inner wall of the side beam has a first inclined portion gradually inclined towards the receiving cavity in a direction away from the cold plate, the middle beam has a second inclined portion gradually inclined towards the receiving cavity in a direction away from the cold plate, the battery cell assembly comprises a third inclined portion at least partially abutting the first inclined portion and a fourth inclined portion at least partially abutting the second inclined portion.

2. The battery pack of claim 1, wherein, The battery cell assembly comprises a battery pack and end plates, the battery pack comprises a plurality of battery cells arranged in a first direction, the end plates comprise a first end plate arranged between the side beam and the battery pack and a second end plate arranged between the middle beam and the battery pack, the first end plate and the second end plate are arranged in the first direction.

3. The battery pack of claim 1, wherein, The contact area of the first inclined portion and the third inclined portion is 30% to 100% of the area of the first inclined portion or the contact area of the first inclined portion and the third inclined portion is 30% to 100% of the area of the third inclined portion.

4. The battery pack of claim 1, wherein, The contact area of the second inclined portion and the fourth inclined portion is 30% to 100% of the area of the second inclined portion or the contact area of the second inclined portion and the fourth inclined portion is 30% to 100% of the area of the fourth inclined portion.

5. The battery pack of claim 1, wherein, The inclination angle of the first inclined portion and / or the third inclined portion is 0.1 to 5 degrees, and the inclination angle of the second inclined portion and / or the fourth inclined portion is 0.1 to 5 degrees.

6. The battery pack of claim 2, wherein, The side of the first end plate away from the side beam is provided with a first groove away from the battery pack, and the side of the second end plate away from the middle beam is provided with a second groove away from the battery pack.

7. The battery pack of claim 6, wherein, The first groove and the profile of the first end plate are provided with a first adhesive member bonding with the battery pack, and the second groove and the profile of the second end plate are provided with a second adhesive member bonding with the battery pack.

8. The battery pack of claim 2, wherein, The first end plate connects at least two groups of battery packs, and the at least two groups of battery packs are arranged in a second direction perpendicular to the first direction.

9. The battery pack of claim 2, wherein, The battery cell assembly and the cold plate are provided with a third adhesive member, and adjacent two battery cells are provided with a fourth adhesive member.

10. An electric device, characterized by The battery pack comprises the battery pack according to any one of claims 1-9.

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