CN220821764U - Battery module and battery pack - Google Patents
Battery module and battery pack Download PDFInfo
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- CN220821764U CN220821764U CN202322365593.9U CN202322365593U CN220821764U CN 220821764 U CN220821764 U CN 220821764U CN 202322365593 U CN202322365593 U CN 202322365593U CN 220821764 U CN220821764 U CN 220821764U
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- 238000003466 welding Methods 0.000 claims abstract description 115
- 239000000463 material Substances 0.000 claims abstract description 11
- 230000000052 comparative effect Effects 0.000 description 12
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 239000000306 component Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 229910001094 6061 aluminium alloy Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Abstract
The utility model provides a battery module and a battery pack, which comprise a module frame and a battery core stacking body accommodated in the module frame, wherein the module frame comprises side plates and end plates, the side plates and the end plates are respectively arranged on the periphery of the battery core stacking body to form a frame with two open ends, end plates are provided with end plate grooves, the end parts of the end plates are provided with side plate grooves, the end plates are matched with opposite side plate grooves to form welding grooves, the surface parallel to the opening of the frame is represented as a first plane, the section of the welding grooves on the first plane is trapezoid, and welding materials are filled in the welding grooves. According to the battery module and the battery pack, the welding strength of the welding position of the end plate and the side plate can be remarkably improved, and the probability of occurrence of cracks at the welding position is greatly reduced.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a battery module and a battery pack.
Background
In recent years, power cells have been widely used in many fields. The battery module is used as a core component of the power battery pack, and the structural rigidity of the battery module influences the safety and the service life of the power battery pack.
Conventional battery modules employ a module frame to fix a battery stack therein. In order to ensure the connection stability of the module frame, the end plate and the side plate of the module frame are generally fixed by laser welding.
However, the conventional end plate and side plate are prone to cracking at the welding position after laser welding, and have a problem of insufficient welding strength.
Disclosure of utility model
In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a battery module and a battery pack, which can significantly reduce the probability of cracking of a frame of the battery module after welding, and also improve the welding strength.
In order to achieve the above and other related objects, the present utility model provides a battery module, including a module frame and a battery cell stack body accommodated in the module frame, where the module frame includes a side plate and an end plate, the side plate and the end plate are respectively disposed on a peripheral side of the battery cell stack body to form a frame with two open ends, an end plate groove is disposed at an end of the end plate, a side plate groove is disposed at an end of the side plate, the end plate groove and an opposite side plate groove are matched to form a welding groove, a plane parallel to the opening of the frame is denoted as a first plane, a section of the welding groove on the first plane is trapezoidal, and the welding groove is filled with a welding material.
According to an embodiment of the present utility model, the end plate groove forms a stepped ramp in the end plate width direction, the stepped ramp comprising:
the side plate is connected with the vertical slope in a lap joint mode, and one side of the side plate is connected with the vertical slope in a lap joint mode;
And the welding slope surface is connected with the vertical slope surface to form a step shape, and the welding groove is formed between the welding slope surface and the side plate groove.
According to a specific embodiment of the utility model, the outer surface of the side plate facing away from the cell stack is denoted as a second plane, and the welding groove is flared in the direction of the second plane.
According to one embodiment of the utility model, the ratio of the depth H of the welding groove to the thickness S1 of the side plate is 0.5-0.7.
According to a specific embodiment of the utility model, the thickness S1 of the side plate is 2mm less than or equal to S1 less than or equal to 4mm, and the depth H of the welding groove is 1.5mm less than or equal to H less than or equal to 1.9mm.
According to a specific embodiment of the utility model, the thickness S2 of the end plate is 6mm < S2 < 8mm.
According to a specific embodiment of the utility model, the inclined surface of the welding groove at the end plate is represented as an end plate inclined surface, and the included angle A1 between the end plate inclined surface and the second plane is 60 degrees less than or equal to A1 degrees less than or equal to 80 degrees.
According to a specific embodiment of the utility model, the inclined surface of the welding groove at the side plate is represented as a side plate inclined surface, and an included angle A2 between the side plate inclined surface and the second plane is 60 degrees less than or equal to A2 degrees less than or equal to 80 degrees.
According to one embodiment of the utility model, the welding strength P of the end plate and the opposite side plate at the welding groove is 19000 N.ltoreq.P.ltoreq.22000N.
The utility model also provides a battery pack comprising the battery module.
As described above, the utility model provides a battery module and a battery pack, wherein grooves are formed in the end plates and the side plates of the battery module frame, so that trapezoid welding grooves are formed after the end plates and the side plates are overlapped, the welding strength of the welding parts of the end plates and the side plates can be remarkably improved, and the probability of cracks at the welding parts is greatly reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic top view of a module frame according to the present utility model;
FIG. 2 is a schematic perspective view of a module frame according to the present utility model;
Fig. 3 is a schematic structural view of the joint between the end plate and the side plate according to the present utility model.
Description of element numbers:
10. a module frame; 101. a first plane; 11. a side plate; 111. a side plate groove; 112. a second plane; 12. an end plate; 121. end plate grooves; 1211. a vertical slope; 1212. welding the slope; 20. a cell stack; 13. welding grooves; 131. an end plate inclined plane; 132. side plate inclined plane.
Detailed Description
Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following detailed description of the present utility model. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that, the drawings provided in the following embodiments are only for illustrating the basic concept of the present utility model by way of illustration, and only the components related to the present utility model are shown in the drawings, rather than the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.
Referring to fig. 1, the present utility model provides a battery module, which may include a module frame 10 and a cell stack 20. The module frame 10 may be enclosed around the periphery of the cell stack 20 to form a battery module. Specifically, the module frame 10 may include side plates 11 and end plates 12. The side plates 11 may be provided in a pair, and the pair of side plates 11 are provided opposite to each other. The end plates 12 may likewise be provided in a pair, with the pair of end plates 12 being disposed opposite each other. By welding the ends of each end plate 12 and the opposite end plate 11, a frame open at both ends can be formed, and the cell stack 20 is enclosed within the frame. Further, the side plates 11 and the end plates 12 may be made of aluminum alloy, stainless steel or other materials, such as six-series aluminum alloy.
Referring to FIG. 3, to ensure the welding effect between the end plate 12 and the side plate 11, the thickness S2 of the end plate 12 may be set between 6mm and 8mm, i.e., 6 mm. Ltoreq.S2.ltoreq.8mm. An end plate groove 121 may be provided at an end of each end plate 12. The thickness S1 of the side plate 11 may be set between 2mm and 4mm, i.e., 2 mm. Ltoreq.S1.ltoreq.4 mm. The end of each side plate 11 may be provided with a side plate groove 111. Each end plate groove 121 and the opposite side plate groove 111 may cooperate to form a weld groove 13 in a state where the end of the end plate 12 overlaps the end of the opposite side plate 11.
Further, the end plate groove 121 may be formed as an inclined surface at the welded portion, and the side plate groove 111 may be formed as an inclined surface at the welded portion. At this time, the welding groove 13 forms a trapezoidal cross section on the first plane 101 parallel to the frame opening. Since both sides of the welding groove 13 are inclined, the welding area can be further increased, thereby improving the welding strength. The depth H of the welding groove 13 may be set between 1.5mm and 1.9mm, i.e., 1.5 mm.ltoreq.H.ltoreq.1.9 mm. Further, the ratio of the depth H of the welding groove 13 to the thickness S1 of the side plate 11 may be set between 0.5 and 0.7, i.e., 0.5.ltoreq.H/S1.ltoreq.0.7, to ensure the welding strength of the end plate 12 and the side plate 11.
In one embodiment, referring to fig. 3, in order to ensure the connection strength between the end plate 12 and the side plate 11, the end plate groove 121 may form a stepped slope in the width direction of the end plate 12, a part of the stepped slope may be formed as a vertical slope 1211, another part of the stepped slope may be formed as a welding slope 1212, and the welding slope 1212 may be connected to the vertical slope 1211 to form an integral stepped slope. One side of the side plate 11 may overlap and fit over the vertical ramp 1211 so that the side plate 11 stably overlaps the end plate 12 to facilitate welding. The welding ramp 1212 may cooperate with the opposing side panel groove 11 to form a trapezoidal cross-section welding groove 13 for laser welding by filling welding material into the welding groove 13.
In one embodiment, referring to fig. 1 and 2, in order to facilitate the robot driving the laser head to fill the welding material in the welding groove 13, the welding groove 13 may be flared in a direction away from the cell stack 20. Further, if the outer surface of the side plate 11 facing away from the cell stack 20 is denoted as the second plane 112, the welding groove 13 may be disposed to be flared toward the second plane 112, so that the robot may drive the laser head to perform laser welding into the welding groove 13 at an angle perpendicular to the second plane 112.
Further, referring to fig. 1, the inclined surface of the welding groove 13 at the end plate 12 may be referred to as an end plate inclined surface 131, and the inclined surface of the welding groove 13 at the side plate 11 may be referred to as a side plate inclined surface 132. To ensure welding quality, the angle A1 of the end plate inclined surface 131 to the second plane 112 may be set to 60 DEG to 80 DEG, that is, 60 DEG A1 is 80 deg. The angle A2 of the side plate inclined surface 132 with the second plane 112 may be set at 60 to 80, that is, 60A 2 80.
Specifically, in welding, the side plate 11 is first overlapped on the end plate groove 121 of the end plate 12 so that a welding groove 13 having a trapezoidal cross section is formed between the side plate groove 111 of the side plate 11 and the end plate groove 121 of the end plate 12. Then, the robot drives the laser head to fill the welding groove 13 with the welding material, and the welding material, the end plate 12 and the side plate 11 are welded together, so that the end plate 12 and the side plate 11 are fixed. After the end plate 12 and the side plate 11 are welded, the welding strength P at the welding groove 13 can reach 19000N to 22000N, namely, the welding strength P is 19000N less than or equal to P less than or equal to 22000N. Specifically, the welding mode may be laser filler wire welding, and the welding material may be an aluminum alloy material, for example 6061 aluminum alloy. The end plate 12 and the side plate 11 are provided with the grooves in advance so as to form the trapezoid welding groove 13 for welding, so that the welding area can be increased, the welding strength can be improved, and the probability of cracking of the frame of the battery module after welding can be obviously reduced.
Hereinafter, the present utility model will be more specifically explained by referring to examples, which should not be construed as limiting. Appropriate modifications may be made within the scope consistent with the gist of the utility model, which fall within the technical scope of the utility model.
Example 1
The side plates 11 and the end plates 12 of the module frame 10 may be made of 6 series aluminum alloy, and the thickness of the side plates 11 may be set to 3 mm, and the thickness of the end plates 12 may be set to 6 mm. Side plate grooves 111 are formed at both ends of the side plate 11, end plate grooves 121 are formed at both ends of the end plate 12, and a trapezoidal welding groove 13 can be formed between the side plate groove 111 of each side plate 11 and the end plate groove 121 of the opposite end plate 12. The depth of the welding groove 13 may be set to 1.7 mm. The end plate inclined surface 131 may be set at 74 degrees to the second plane 112, and the side plate inclined surface 132 may be set at 74 degrees to the second plane 112. The parameters can be used for carrying out laser filler wire welding on the side plate 11 and the end plate 12, and the filler wire can be 6061 aluminum alloy.
Example 2
The thickness of the side plate 11 was set to 2mm, the depth of the weld groove was set to 1.5 mm, and the remaining parameters were the same as in example 1.
Example 3
The thickness of the side plate 11 was set to 4mm, the depth of the weld groove was set to 1.9 mm, and the remaining parameters were the same as in example 1.
Example 4
The included angle of the end plate inclined surface 131 and the second plane 112 was set to 60 degrees, the included angle of the side plate inclined surface 132 and the second plane 112 was set to 60 degrees, and the remaining parameters were the same as those of embodiment 1.
Example 5
The included angle of the end plate inclined surface 131 and the second plane 112 was set to 80 degrees, the included angle of the side plate inclined surface 132 and the second plane 112 was set to 80 degrees, and the remaining parameters were kept the same as those of embodiment 1.
Comparative example 1
The thickness of the side plate 11 was set to 1.9 mm, and the remaining parameters were kept the same as in example 1.
Comparative example 2
The depth of the weld groove was set to 1.4 mm and the remaining parameters were identical to those of example 1.
Comparative example 3
The depth of the weld groove was set to 2.0 mm and the remaining parameters were the same as in example 1.
Comparative example 4
The included angle of the end plate inclined surface 131 and the second plane 112 was set to 85 degrees, the included angle of the side plate inclined surface 132 and the second plane 112 was set to 85 degrees, and the remaining parameters were kept the same as those of embodiment 1.
Comparative example 5
The included angle of the end plate inclined surface 131 and the second plane 112 was set to 55 degrees, the included angle of the side plate inclined surface 132 and the second plane 112 was set to 55 degrees, and the remaining parameters were kept the same as in example 1.
All test results are shown in table 1.
Table 1, examples 1 to 5 and comparative examples 1 to 5, data on welding results of the end plate and the side plate
Referring to Table 1, it is apparent from comparative examples 1 to 5 and comparative example 1 that when the thickness of the side plate 11 is less than 2 mm, the welding strength is greatly reduced and cracks are formed at the welding portion. When the thickness of the side plate 11 is controlled to be between 2 mm and 4mm, the welding strength can be 19000N to 22000N, and no crack exists at the welding position.
Referring to Table 1, it is apparent from comparative examples 1 to 5 and comparative examples 2 to 3 that when the depth of the weld groove 13 is less than 1.5 mm, the weld strength is greatly reduced and cracks are present at the weld. When the depth of the welding groove 13 is greater than 1.9 mm, the welding strength is also greatly reduced, and cracks exist at the welding position. When the depth of the welding groove 13 is controlled to be between 1.5 mm and 1.9 mm, the welding strength can be 19000N to 22000N, and no crack exists at the welding position.
Referring to table 1, as shown in comparative examples 1-5 and comparative examples 4-5, when the included angle between the end plate inclined surface 131 and the second plane 112 is smaller than 60 degrees, and the included angle between the side plate inclined surface 132 and the second plane 112 is smaller than 60 degrees, the welding strength is greatly reduced, and the welding portion has cracks. When the included angle between the end plate inclined surface 131 and the second plane 112 is greater than 80 degrees and the included angle between the side plate inclined surface 132 and the second plane 112 is greater than 80 degrees, the welding strength is also greatly reduced, and a crack exists at the welding position. When the included angle between the end plate inclined surface 131 and the second plane 112 is controlled to be between 60 and 80 degrees, and the included angle between the side plate inclined surface 132 and the second plane 112 is controlled to be between 60 and 80 degrees, the welding strength can reach 19000N to 22000N, and no crack exists at the welding position.
In addition, the utility model also provides a battery pack comprising the battery module. The plurality of battery modules can be assembled to form a battery pack. The module frame of the battery module in the battery pack has higher welding strength, and the probability of occurrence of cracks at the subsequent welding position is lower. Based on the battery module, the structural strength of the battery pack can be improved.
In summary, according to the utility model, the grooves are formed on the end plate and the side plate of the battery module frame, so that the welding grooves in the trapezoid shape are formed after the end plate and the side plate are overlapped, the welding strength of the welding position of the end plate and the side plate can be remarkably improved, and the probability of occurrence of cracks at the welding position is greatly reduced.
In the description of the present specification, the descriptions of the terms "present embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiments of the utility model disclosed above are intended only to help illustrate the utility model. The examples are not intended to be exhaustive or to limit the utility model to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best understand and utilize the utility model. The utility model is limited only by the claims and the full scope and equivalents thereof.
Claims (10)
1. The utility model provides a battery module, includes the module frame and accept in the electric core stack in the module frame, its characterized in that, the module frame includes curb plate and end plate, the curb plate with the end plate is located respectively electric core stack's week side to form both ends open-ended frame, the end plate groove is seted up to the tip of end plate, the curb plate groove is seted up to the tip of curb plate, the end plate groove with relative the cooperation of curb plate groove forms the welding groove, is on a parallel with frame open-ended face represents to be first plane, the welding groove is trapezoidal in the cross-section on the first plane, welding groove department is filled with welding material.
2. The battery module according to claim 1, wherein the end plate groove forms a stepped slope in the end plate width direction, the stepped slope comprising:
the side plate is connected with the vertical slope in a lap joint mode, and one side of the side plate is connected with the vertical slope in a lap joint mode;
And the welding slope surface is connected with the vertical slope surface to form a step shape, and the welding groove is formed between the welding slope surface and the side plate groove.
3. The battery module of claim 1, wherein an outer surface of the side plate facing away from the cell stack is denoted as a second plane, and the welding groove is flared toward the second plane.
4. The battery module according to claim 1, wherein a ratio of a depth H of the welding groove to a thickness S1 of the side plate is 0.5.ltoreq.h/S1.ltoreq.0.7.
5. The battery module according to claim 1, wherein the thickness S1 of the side plate is 2 mm.ltoreq.s1.ltoreq.4mm, and the depth H of the welding groove is 1.5 mm.ltoreq.h.ltoreq.1.9 mm.
6. The battery module according to claim 1, wherein the thickness S2 of the end plate is 6mm ∈s2+.8mm.
7. The battery module according to claim 3, wherein the inclined surface of the welding groove at the end plate is expressed as an end plate inclined surface, and the angle A1 of the end plate inclined surface with respect to the second plane is 60 ° or more and A1 or less and 80 °.
8. The battery module according to claim 3, wherein the inclined surface of the welding groove at the side plate is represented as a side plate inclined surface, and the angle A2 of the side plate inclined surface with respect to the second plane is 60 ° or more and A2 or less and 80 °.
9. The battery module according to claim 1, wherein a welding strength P of the end plate and the opposite side plate at the welding groove is 19000 n.ltoreq.p.ltoreq.22000N.
10. A battery pack comprising a battery module according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322365593.9U CN220821764U (en) | 2023-08-31 | 2023-08-31 | Battery module and battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322365593.9U CN220821764U (en) | 2023-08-31 | 2023-08-31 | Battery module and battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220821764U true CN220821764U (en) | 2024-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322365593.9U Active CN220821764U (en) | 2023-08-31 | 2023-08-31 | Battery module and battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220821764U (en) |
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2023
- 2023-08-31 CN CN202322365593.9U patent/CN220821764U/en active Active
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