A battery module and electrical equipment

Abstract

The present invention discloses a battery module and an electric device. The battery module includes a box, a battery cell group, two support bases and two end plates. The battery cell group is arranged in the box. The battery cell group includes a plurality of battery cells arranged along a first direction, and the first direction is the length direction of the battery cell group. The two support bases are arranged at intervals along the first direction and are located on both sides of the battery cell group. The two end plates are respectively installed on the two support bases. By installing the end plates on the support bases, the end plate assembly method is simplified, the end plate assembly time is shortened, and the battery module assembly efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery module and electrical equipment. Background Art

[0002] In the related art, a battery module includes a plurality of battery cells connected in series or in parallel to form a battery cell group. The battery cell group is surrounded by side plates and end plates, and the end plates are generally connected to the side plates by fastening bolts.

[0003] However, the installation method of the above end plate is complicated and takes a long time to assemble, resulting in a decrease in the battery module assembly efficiency. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a battery module, when assembling the battery module, the assembler can directly insert the end plate into the support base, the operation is convenient and simple, and no other tools are required to complete this assembly step, thereby improving the assembly efficiency of the battery module.

[0005] The present invention also aims to provide an electrical device having the battery module.

[0006] A battery module according to an embodiment of the first aspect of the present invention includes a box body, a battery cell group, two supporting bases and two end plates.

[0007] The battery cell group is arranged in the box body, and the battery cell group includes a plurality of battery cells arranged along a first direction, wherein the first direction is the length direction of the battery cell group; the two support bases are arranged at intervals along the first direction and are located on both sides of the battery cell group; the two end plates are respectively installed on the support bases.

[0008] According to the embodiment of the present invention, by installing the end plate on the support base, the end plate assembly method is simplified, the end plate assembly time is shortened, and the battery module assembly efficiency is improved.

[0009] According to some embodiments of the present invention, at least one plug-in portion is convexly provided on the surface of the support base facing the end plate, at least one socket portion allowing the plug-in portion to be inserted is formed on the surface of the end plate facing the support base, and the plug-in portion and the socket portion are inserted and matched to achieve a fixed connection between the support base and the end plate. With such a configuration, the insertion and matching method has a simple structure and is easy to manufacture.

[0010] According to some embodiments of the present invention, the support base includes a base body, and the base body and the plug-in portion are integrally formed. The base body and the plug-in portion are integrally formed, which can simplify the manufacturing process of the plug-in portion, shorten the processing time of the support base, and reduce the processing cost of the support base.

[0011] According to some embodiments of the present invention, the support base is provided with two plug-in parts, and the two plug-in parts are symmetrically distributed about the middle position of the support base in the second direction, and the second direction is the width direction of the battery cell group. The plug-in part is arranged away from the middle area of ​​the battery cell in the Y direction, which can avoid the plug-in part from being impacted by a large force, so that the plug-in part is subjected to less force, ensuring the rigidity (verticality) and stability of the plug-in part, which is conducive to the convenience of disassembly of the battery module when the battery module is repaired later.

[0012] According to some embodiments of the present invention, the plug-in portion is a cylinder, and the socket portion is a blind hole matching the cylinder. With this arrangement, the plug-in portion is subjected to a more uniform force, which is conducive to ensuring the rigidity and stability of the plug-in portion and avoiding stress concentration on the plug-in portion.

[0013] According to some embodiments of the present invention, the height of the plug part is H1, the height of the end plate is H2, and 1 / 2H2≤H1≤H2. The connection strength between the plug part and the socket part is ensured, thereby improving the connection stability between the end plate and the support base.

[0014] According to some embodiments of the present invention, the end plate includes a main body and a plurality of reinforcing parts, the plurality of reinforcing parts connected end to end are arranged around the main body, the thickness of the reinforcing parts is greater than the thickness of the main body, and the socket part is located on the reinforcing parts. This arrangement avoids affecting the material rigidity and stability of the area around the socket part due to the formation of the socket part, and improves the structural stability of the end plate.

[0015] According to some embodiments of the present invention, the surface of the end plate facing the support base is provided with a convex strip, the surface of the support base facing the end plate is recessed to form a limiting groove adapted to the convex strip, and the convex strip is inserted into the limiting groove to achieve a fixed connection between the support base and the end plate. With such a configuration, on the one hand, the convex strip can improve the structural strength of the end plate, and on the other hand, the convex strip can improve the connection strength between the end plate and the support base. In addition, the cooperation between the convex strip and the limiting groove can further limit the end plate in the Y direction.

[0016] According to some embodiments of the present invention, the convex strip is located at a middle position of the end plate in the second direction.

[0017] According to some embodiments of the present invention, the thickness of the reinforcement portion is 1 mm-10 mm, and along the second direction, the ratio of the length of the convex strip to the length of the end plate is b, 10%≤b≤50%. With such a configuration, the connection strength between the end plate and the support base is increased as much as possible while ensuring the effect of strengthening the end plate; and the overall weight of the end plate is reduced as much as possible while ensuring the connection strength between the end plate and the support base.

[0018] According to some embodiments of the present invention, the support base is recessed away from the battery cell group along the first direction to form the notch-shaped limiting groove. This arrangement allows the end plate and the support base to be inserted and matched, thereby preventing the end plate and the support base from being over-limited due to the limiting groove and the reinforcement part, which may lead to an increase in the assembly accuracy between the end plate and the support base.

[0019] The electrical equipment according to the embodiment of the second aspect of the present invention comprises the battery module in the above embodiment.

[0020] According to the electric device of the embodiment of the present invention, by adopting the above-mentioned battery module, the assembly efficiency of the electric device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of a battery module according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of a battery module according to an embodiment of the present invention;

[0023] Figure 3 is an exploded schematic diagram of the internal structure according to an embodiment of the present invention;

[0024] Figure 4 is a front view of the internal structure of a battery module according to an embodiment of the present invention;

[0025] Figure 5 is a bottom view of the internal structure of a battery module according to an embodiment of the present invention;

[0026] Figure 6 is a schematic structural diagram of a support base according to an embodiment of the present invention;

[0027] Figure 7 is a schematic structural diagram of an end plate according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] Box 10,

[0030] Battery cell group 20, battery cell 21, electrode end 211, bottom end 212,

[0031] Support base 30, plug-in portion 31, limit groove 32, base body 33,

[0032] The end plate 40, the main body 41, the heat dissipation hole 411, the reinforcement part 42, the insertion hole 421, the convex strip 422, the circular ring 43, the cross 44,

[0033] Insulating base 50 , cable tie 60 , connecting base plate 70 . DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific processes and examples of materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0036] The battery module and the electric device according to the embodiments of the present invention are described below with reference to the accompanying drawings.

[0037] like Figure 1-Figure 7 As shown, the battery module according to the embodiment of the first aspect of the present invention comprises a box body 10, a battery cell group 20, two support bases 30 and two end plates 40. The battery cell group 20 is arranged in the box body 10, and the battery cell group 20 comprises a plurality of battery cells 21 arranged along a first direction, and the first direction is the length direction of the battery cell group 20. The two support bases 30 are arranged at intervals along the first direction and are located on both sides of the battery cell group 20, and the two end plates 40 are respectively mounted on the two support bases 30.

[0038] Specifically, in the embodiment of the present invention, the first direction is Figure 1-Figure 3 The middle X direction is the length direction of the battery pack 20, and the second direction is Figure 1-Figure 3 The Y direction is the width direction of the battery cell group 20.

[0039] The battery cell group 20 includes a plurality of battery cells 21 arranged along the X direction. Figure 2 or Figure 3 As shown, eight battery cells 21 arranged along the X direction form a battery cell group 20. In the X direction, two support bases 30 are arranged at intervals, and the battery cell group 20 is located between the two support bases 30. The two support bases 30 sandwich the battery cell group 20. In this way, the battery cell group 20 can be constrained in the X direction, so that the two support bases 30 can fix the battery cell group 20.

[0040] The two end plates 40 are respectively mounted on the two support bases 30. For example, the end plates 40 and the support bases 30 may be inserted and matched, the end plates 40 and the support bases 30 may be snap-fitted, or the end plates 40 and the support bases 30 may be connected in other suitable ways. This embodiment does not specifically limit the connection method between the end plates 40 and the support bases 30.

[0041] When assembling the battery module, the two support bases 30 clamp the battery cell group 20. The assembler needs to complete the assembly of the end plate 40 before assembling the box body 10. For the assembly of the end plate 40, the assembler can directly install (insert) the end plate 40 on the support base 30, which is convenient and simple to operate, and no other tools are required to complete this assembly step. In the related art, the end plate 40 is fastened to the box body 10 by bolts, and the assembly of the end plate 40 needs to be completed with the help of a wrench, and the assembly of multiple bolts takes a longer assembly time, resulting in reduced assembly efficiency.

[0042] Therefore, according to the embodiment of the present invention, by installing the end plate 40 on the support base 30, the assembly method of the end plate 40 is simplified, the assembly time of the end plate 40 is shortened, and the assembly efficiency of the battery module is improved.

[0043] In some embodiments of the present invention, the battery cell 21 includes an electrode end 211 and a bottom end 212 arranged upper and lower, and the support base 30 is arranged close to the bottom end 212. The distance between the two support bases 30 is equal to the length of the battery cell group 20, and the support base 30 is against the outermost battery cell 21 of the battery cell group 20.

[0044] Specifically, Figure 3 and 4 As shown, the battery module also includes a sheet-shaped insulating base 50, a cable tie 60 and a connecting bottom plate 70. The two support bases 30 and the insulating base 50 are located on the same horizontal plane, and one support base 30, the insulating base 50, and the other support base 30 are arranged in sequence along X, and the battery cell group 20 is placed on the insulating base 50. The distance between the two support bases 30 is equal to the length of the battery cell group 20, as shown in FIG. Figure 4 As shown, the left support base 30 abuts against the leftmost battery cell 21 in the battery cell group 20, and the right support base 30 abuts against the rightmost battery cell 21 in the battery cell group 20. In this way, the two support bases 30 sandwich the battery cell group 20.

[0045] Two tie bands 60 wrap the battery cells 21 into a whole, namely, a battery cell group 20 , wherein one tie band 60 is close to the electrode end 211 of the battery cell 21 , and the other tie band 60 is close to the bottom end 212 of the battery cell 21 .

[0046] The connecting bottom plate 70 connects the two supporting bases 30 , so that the two supporting bases 30 are connected into a whole, which facilitates the assembly of the box body 10 .

[0047] In some embodiments of the present invention, at least one plug-in portion 31 is convexly provided on the surface of the support base 30 facing the end plate 40, and at least one plug-in portion 421 is formed on the surface of the end plate 40 facing the support base 30 to allow the plug-in portion 31 to be inserted. The plug-in portion 31 and the plug-in portion 421 are inserted and matched to achieve a fixed connection between the support base 30 and the end plate 40. In this way, the insertion and matching method has a simple structure and is easy to manufacture.

[0048] Specifically, Figure 3 , Figure 6 and Figure 7 , a plug-in portion 31 is provided on the surface of the support base 30 facing the end plate 40, and a socket portion 421 matching the plug-in portion 31 is provided on the end plate 40, and the plug-in portion 31 is inserted into the socket portion 421, so that the end plate 40 is connected to the support base 30. The plug-in portion 31 can be a protrusion, and correspondingly, the socket portion 421 is a groove; the plug-in portion 31 can be a first tooth, and correspondingly, the socket portion 421 can be a second tooth meshing with the first tooth; the plug-in portion 31 and the socket portion 421 can be other suitable shapes, and this embodiment does not specifically limit the shapes of the plug-in portion 31 and the socket portion 421.

[0049] It should be noted that, in some embodiments, a socket portion 421 may be provided on the end plate 40 , and a plug-in portion 31 matched with the socket portion 421 may be provided on the support base 30 .

[0050] In some embodiments of the present invention, Figure 3 As shown, the support base 30 includes a base body 33, and a plug-in portion 31 is protruding outward on the surface of the base body 33 facing the end plate 40. The base body 33 and the plug-in portion 31 are integrally formed, which can simplify the manufacturing process of the plug-in portion 31, shorten the processing time of the support base 30, and reduce the processing cost of the support base 30.

[0051] Of course, it is understandable that the base body 33 and the plug-in portion 31 can be separately provided, for example, the plug-in portion 31 is welded to the base body 33, or the plug-in portion 31 and the base body 33 are threadedly connected, or the plug-in portion 31 and the base body 33 are plug-connected. The embodiment of the present invention does not impose any specific limitation on the connection method between the base body 33 and the plug-in portion 31.

[0052] In some embodiments of the present invention, two plug-in portions 31 are provided on the support base 30 , and the two plug-in portions 31 are symmetrically distributed about the middle position of the support base 30 in the second direction, and the second direction is the width direction of the battery cell group 20 .

[0053] Specifically, Figure 3As shown, the support base 30 includes a base body 33, and two spaced plug-in parts 31 are protruded on the surface of the base body 33 facing the end plate 40. The area between the two plug-in parts 31 faces the middle area of ​​the battery cell 21, and the two plug-in parts 31 are symmetrically arranged about the middle area of ​​the battery cell 21.

[0054] When the battery module expands, it bulges from the middle of the battery cell 21 to the surrounding areas, and the force in the middle of the battery cell 21 is the largest, and thus the force applied to the middle area of ​​the end plate 40 is the largest. Based on this, the plug-in portion 31 is arranged away from the middle area of ​​the battery cell 21 in the Y direction, which can prevent the plug-in portion 31 from being impacted by a large force, so that the plug-in portion 31 is subjected to a smaller force, ensuring the rigidity (verticality) and stability of the plug-in portion 31, which is conducive to the convenience of disassembly of the battery module when the battery module is repaired later.

[0055] In some embodiments of the present invention, the ratio of the distance between the two plug-in portions 31 to the width of the battery cell group 20 in the second direction is a, and 2 / 3≤a≤1.

[0056] Specifically, Figure 6 As shown, the length direction of the end plate 30 is in the same direction as the width direction of the battery cell group 20. The two plug-in parts 31 are respectively located at both ends of the end plate 30, that is, the distance between the two plug-in parts 31 is roughly the same as the width of the battery cell group 20. This arrangement is convenient for processing.

[0057] Alternatively, the distance between the two plug-in portions 31 is approximately 2 / 3 of the width of the battery cell group 20. Such an arrangement is most conducive to ensuring the rigidity (verticality) and stability of the plug-in portion 31.

[0058] In some embodiments of the present invention, the plug-in portion 31 is a cylinder, the socket portion 421 is a blind hole matching the cylinder, and the height of the plug-in portion 31 is greater than or equal to half the height of the end plate 40 and less than or equal to the height of the end plate 40 .

[0059] It should be noted that if Figure 6 As shown, the plug-in portion 31 may be a cylinder, a quadrangular prism, a hexagonal prism, or other suitable regular polygonal prisms.

[0060] Preferably, the plug-in portion 31 is a cylinder. With this configuration, the plug-in portion 31 is subjected to force more evenly, which is beneficial to ensuring the rigidity and stability of the plug-in portion 31 and avoiding stress concentration on the plug-in portion 31 .

[0061] In addition, combined Figure 6 and Figure 7 It can be seen that the height of the plug-in part 31 is H1, the height of the end plate 40 is H2, and 1 / 2H2≤H1≤H2. This arrangement ensures the connection strength between the plug-in part 31 and the socket part 421, thereby improving the connection stability between the end plate 40 and the support base 30.

[0062] It should be noted that the plug-in portion 31 may be a cylinder with a constant diameter, for example Figure 6 As shown, such arrangement facilitates processing; alternatively, the plug-in portion 31 may be a stepped cylinder.

[0063] In some embodiments of the present invention, the support base 30 and the plug-in portion 31 are made of low alloy steel, carbon steel, or other suitable rigid materials. The end plate 40 is made of aluminum alloy or aluminum material. This arrangement reduces the overall weight of the end plate 40, thereby reducing the overall weight of the battery module, which contributes to the lightweight design of the battery module.

[0064] Of course, it is understandable that the end plate 40 , the support base 30 and the plug-in portion 31 are all made of low alloy steel, carbon steel, or other suitable rigid materials.

[0065] In some embodiments of the present invention, the end plate 40 includes a main body portion 41 and multiple reinforcement portions 42. The multiple reinforcement portions 42 connected end to end are arranged around the main body portion 41. The thickness of the reinforcement portion 42 is greater than the thickness of the main body portion 41. The socket portion 421 is located on the reinforcement portion 42.

[0066] Specifically, Figure 7 As shown, the end plate 40 includes a main body 41 and a reinforcing portion 42. The main body 41 is rectangular, and the reinforcing portion 42 includes a reinforcing portion 42a, a reinforcing portion 42b, a reinforcing portion 42c and a reinforcing portion 42d. The reinforcing portions 42a, 42b, 42c and 42d are connected end to end in sequence and surround the main body 41. The reinforcing portions 42a and 42c are arranged along the height direction of the end plate 40, and the reinforcing portions 42b and 42d are arranged along the length direction of the end plate 40. A through-hole-shaped plug-in portion 421 is formed on the reinforcing portions 42a and 42c. In this way, the material rigidity and stability of the area around the plug-in portion 421 are avoided from being affected by the formation of the plug-in portion 421, and the structural stability of the end plate 40 is improved.

[0067] Furthermore, a circular ring 43 and a cross 44 are provided in the middle of the surface of the main body 41 facing away from the battery cell 21, and the circular ring 43 and the cross 44 are arranged at the same geometric center. When the battery module expands, it bulges from the middle of the battery cell 21 to the surroundings, and the force in the middle of the battery cell 21 is the largest. Such an arrangement helps to improve the structural strength of the end plate 40.

[0068] Furthermore, a plurality of heat dissipation holes 411 penetrating the main body 41 are arranged in an array on the main body 41 , which helps to dissipate heat of the battery module.

[0069] In some embodiments of the present invention, a convex strip 422 is provided on the surface of the end plate 40 facing the support base 30, and the surface of the support base 30 facing the end plate 40 is recessed to form a limiting groove 32 that is compatible with the convex strip 422. The convex strip 422 is inserted into the limiting groove 32 to achieve a fixed connection between the support base 30 and the end plate 40.

[0070] Specifically, Figure 7 As shown in FIG. 1 , the surface of the end plate 40 facing the support base 30 is provided with a convex strip 422, and the convex strip 422 and the insertion hole 421 are both located on the reinforcing portion 42d. The convex strip 422 is strip-shaped, and the convex strip 422 faces the middle area of ​​the battery cell 21. The surface of the support base 30 facing the end plate 40 is concave to form a limiting groove 32 adapted to the convex strip 422, as shown in FIG. Figure 6 As shown, the limiting groove 32 is limitedly matched with the convex strip 422. In this way, on the one hand, the convex strip 422 can improve the structural strength of the end plate 40, and on the other hand, the convex strip 422 can improve the connection strength between the end plate 40 and the support base 30. In addition, the cooperation between the convex strip 422 and the limiting groove 32 can further limit the end plate 40 in the Y direction.

[0071] It should be noted that, in addition to the convex strip 422 being located at the middle position of the end plate 40 in the second direction, in some embodiments, the convex strip 422 may be located at one end of the end plate 40 .

[0072] In some embodiments of the present invention, Figure 7 As shown, the thickness of the convex strip 422 is 1 mm-10 mm, and along the second direction, the ratio of the length L1 of the convex strip 422 to the length L2 of the end plate 40 is b, and 10%≤b≤50%.

[0073] It is understandable that the thickness of the convex strip 422 can be 1 mm, the thickness of the convex strip 422 can be 10 mm, or a value between the two values. In this way, the connection strength between the end plate 40 and the support base 30 can be improved as much as possible while ensuring the effect of strengthening the end plate 40. The length L1 of the convex strip 422 can be 10% of the length L2 of the end plate 40, and the length L1 of the convex strip 422 can be 50% of the length L2 of the end plate 40. In this way, the length of the convex strip 422 can be set to reduce the overall weight of the end plate 40 as much as possible while ensuring the connection strength between the end plate 40 and the support base 30.

[0074] In some embodiments of the present invention, the support base 30 is recessed away from the battery cell group 20 along the first direction to form a notch-shaped limiting groove 32. This arrangement allows the end plate 40 and the support base 30 to be inserted and matched, thereby preventing the end plate 40 and the support base 30 from being over-limited due to the limiting groove 32 and the convex strip 422, thereby improving the assembly accuracy between the end plate 40 and the support base 30.

[0075] In some embodiments of the present invention, the battery module includes at least two battery cell groups 20 arranged in parallel along the second direction, one battery cell group 20 corresponds to two support bases 30, and the two support bases 30 located on the same side are integrally formed.

[0076] Specifically, Figure 3 As shown, the upper battery cell group 20 corresponds to two support bases 30, and the lower battery cell group 20 corresponds to two support bases 30. The two support bases 30 on the left are integrally formed, and the two support bases 30 on the right are integrally formed. This arrangement, on the one hand, simplifies the processing of the support base 30 and reduces the processing cost of the support base 30, and on the other hand, shortens the assembly time of the battery module and improves the assembly efficiency of the battery module.

[0077] The electrical equipment according to the second embodiment of the present invention comprises the battery module in the above embodiment.

[0078] In the present application scheme, the structure of the electrical equipment is not limited. For example, the electrical equipment can be a mobile device such as a vehicle, a ship, a small aircraft, etc., which includes a power source, and the power source includes the above-mentioned battery module. The electric energy provided by the battery module provides driving force for the electrical equipment. The mobile device can be a pure electric device, that is, the driving force of the electrical equipment is all electric energy, and the power source only includes a battery module. The mobile device can also be a hybrid power device, and the power source includes other power devices such as a battery module and an engine. In some embodiments, the electrical equipment is a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, an electric tricycle or a two-wheeled electric vehicle, etc.

[0079] According to the electric device of the embodiment of the present invention, by adopting the above-mentioned battery module, the assembly efficiency of the electric device is improved.

[0080] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0081] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0084] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery module, characterized in that: include: Box body (10); A battery cell group (20), the battery cell group (20) being arranged in the box (10), the battery cell group (20) comprising a plurality of battery cells (21) arranged along a first direction, the first direction being a length direction of the battery cell group (20); Two support bases (30), the two support bases (30) being arranged at intervals along the first direction and located on both sides of the battery cell group (20); Two end plates (40), the two end plates (40) are respectively mounted on the two support bases (30), at least one plug-in portion (31) is convexly provided on the surface of the support base (30) facing the end plate (40), at least one plug-in hole portion (421) is formed on the surface of the end plate (40) facing the support base (30) to allow the plug-in portion (31) to be inserted, the plug-in portion (31) and the plug-in hole portion (421) are inserted and matched to achieve a fixed connection between the support base (30) and the end plate (40), the support base (30) is provided with two plug-in portions (31), the two plug-in portions (31) are symmetrically distributed at a middle position of the support base (30) in a second direction, and the second direction is the width direction of the battery cell group (20).

2. The battery module according to claim 1, characterized in that: The supporting base (30) comprises a base body (33), and the base body (33) and the plug-in portion (31) are integrally formed.

3. The battery module according to claim 1, characterized in that: The ratio of the distance between the two plug-in portions (31) to the width of the battery cell group (20) in the second direction is a, and 2 / 3≤a≤1.

4. The battery module according to claim 1, characterized in that: The plug-in portion (31) is a cylinder; the plug-in portion (421) is a blind hole matching the cylinder.

5. The battery module according to claim 1, characterized in that: The height of the plug-in portion (31) is H1, the height of the end plate (40) is H2, and 1 / 2H2≤H1≤H2.

6. The battery module according to claim 1, characterized in that: The end plate (40) comprises a main body portion (41) and a plurality of reinforcing portions (42), wherein the plurality of reinforcing portions (42) are connected end to end and are arranged around the main body portion (41), the thickness of the reinforcing portions (42) is greater than the thickness of the main body portion (41), and the insertion hole portion (421) is located on the reinforcing portions (42).

7. The battery module according to claim 1, characterized in that: A convex strip (422) is provided on the surface of the end plate (40) facing the support base (30); a surface of the support base (30) facing the end plate (40) is recessed to form a limiting groove (32) matched with the convex strip (422); the convex strip (422) is inserted into the limiting groove (32) to achieve a fixed connection between the support base (30) and the end plate (40).

8. The battery module according to claim 7, characterized in that: The convex strip (422) is located at a middle position of the end plate (40) in the second direction.

9. The battery module according to claim 7, characterized in that: The thickness of the convex strip (422) is 1 mm to 10 mm; Along the second direction, the ratio of the length of the convex strip (422) to the length of the end plate (40) is b, and 10%≤b≤50%.

10. The battery module according to claim 7, characterized in that: The support base (30) is recessed away from the battery cell group (20) along the first direction to form the notch-shaped limiting groove (32).

11. An electrical device, characterized in that: A battery module comprising any one of claims 1-10.

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