Shell and battery module

Abstract

The utility model relates to the technical field of power batteries, and discloses a shell and a battery module, the shell comprises a frame and a middle side plate, the device adopts a single-side welding mode to enable an inserting part and a mounting groove to be welded so as to realize the connection of the middle side plate and an end plate, and adopts the single-side welding mode to realize the connection of the middle side plate and the end plate. Even if the inserting part and the mounting groove are welded and connected on one side of the first direction, the arrangement can ensure that a welding seam does not have large internal stress during welding and cooling, so that the problems of welding cracks and air holes of the welding seam are effectively solved, the welding tension of the welding seam is ensured to meet the requirement, in addition, the shell does not need to be filled with welding wires during welding, and the welding cost is reduced. And the welding tension can be ensured to meet the requirement, so that the welding quality and the production efficiency are ensured, and the cost rise is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a shell and a battery module. Background Art

[0002] At present, the shell of the existing battery module is usually composed of side panels, middle side panels and end panels welded together, where the middle side panels and end panels are connected by plug-in and laser welding is performed without filler wire and on both sides. After the weld is cooled, the weld between the middle side panel and the end panel often produces welding cracks and pores, which leads to insufficient welding tension and cannot meet the welding requirements of the product. Utility Model Content

[0003] The purpose of the utility model is to provide a shell and a battery module, which can solve the problem of welding cracks and pores in the weld between the middle side plate and the end plate, and greatly improve the welding tension of the weld, meet the welding tension requirements of the product, improve product quality and production efficiency, eliminate the need for rework, and avoid an increase in production costs.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a shell, including: a frame, including a first side plate, a second side plate, a first end plate and a second end plate; the first side plate, the second side plate, the first end plate and the second end plate are arranged along the circumferential direction and enclosed to form a accommodating cavity, wherein the first side plate is arranged opposite to the second side plate, the first end plate is arranged opposite to the second end plate, and at least one of the first end plate and the second end plate has an installation groove; a middle side plate, arranged in the accommodating cavity, the middle side plate has a plug-in portion, the plug-in portion is plugged into the installation groove, and is welded to the installation groove on one side in the first direction.

[0005] Optionally, a length of the mounting groove in the first direction is M, a length of the plug-in portion in the first direction is N, and MN≤0.3 mm.

[0006] Optionally, the first end plate has the installation groove, and the first end plate also has a hollow groove on the side facing the middle side plate, the hollow groove extends along the second direction and passes through the first end plate, the installation groove is arranged on the side of the hollow groove away from the middle side plate, and the plug-in portion passes through the hollow groove and is plugged into the installation groove.

[0007] Optionally, in the third direction, a distance from a side of the hollow groove away from the middle side plate to a side of the first end plate away from the middle side plate is L1, 7mm≤L1≤10mm.

[0008] Optionally, the first end plate and / or the second end plate further has a plurality of hollow holes arranged at intervals, and the hollow holes extend along the second direction and penetrate the end plate.

[0009] Optionally, the middle side plate includes a first plate body and a first support plate, the first plate body extends along a third direction, the plug-in portion is arranged on one side of the first plate body in the third direction, and the first support plate is arranged on the bottom surface of the first plate body.

[0010] Optionally, in the third direction, the first support plate protrudes from the first plate body, and a clamping space is formed between the plug-in portion and the first support plate.

[0011] Optionally, the first side panel or the second side panel includes a second plate body, a second support plate and a baffle; the second support plate is arranged on the side of the second plate body facing the middle side panel, and is arranged on the bottom surface of the second plate body; the baffle is arranged on the side of the second plate body facing the middle side panel, and is arranged on the top surface of the second plate body.

[0012] Optionally, the mounting groove is provided on the first end plate, and the plug-in portion is plugged into the mounting groove and is flush with a side of the first end plate facing away from the first plate body.

[0013] In order to achieve the same purpose, the utility model also provides a battery module, including a battery cell and the shell as described above, wherein the battery cell is arranged in the accommodating cavity.

[0014] Compared with the prior art, the battery module shell of the embodiment of the utility model has the beneficial effect that: the device adopts a single-sided welding method to weld the plug-in part and the installation groove to achieve the connection between the middle side plate and the end plate. The single-sided welding method is adopted, even if the plug-in part and the installation groove are welded on one side of the first direction, such an arrangement can greatly reduce the internal stress generated during the welding process, thereby effectively solving the problems of welding cracks and pores in the weld, and ensuring that the welding tension of the weld meets the requirements. In addition, the shell does not need to be filled with wire during welding, and can also ensure that the welding tension meets the requirements, thereby ensuring welding efficiency and avoiding cost increases. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the main structure of the housing of an embodiment of the utility model;

[0016] Figure 2 is a rear view of the housing of the embodiment of the utility model;

[0017] Figure 3 It is an embodiment of the utility model Figure 2 Cross-section view in the AA direction;

[0018] Figure 4 It is an embodiment of the utility model Figure 3 The enlarged view of point B;

[0019] Figure 5 It is a schematic diagram of the main structure of the end plate of an embodiment of the utility model;

[0020] Figure 6 is a rear view of the end plate of the embodiment of the utility model;

[0021] Figure 7 It is a schematic diagram of the connection structure between the middle side plate and the end plate of an embodiment of the utility model;

[0022] Figure 8 It is a structural schematic diagram of the weld according to an embodiment of the utility model;

[0023] Fig. 9 is a top view of the end plate of an embodiment of the utility model;

[0024] Fig.10 It is a schematic diagram of the main structure of the middle side plate of an embodiment of the utility model;

[0025] Fig.11 is a side view of the middle side plate of an embodiment of the utility model;

[0026] Fig.12 It is an embodiment of the utility model Fig.11 Enlarged view of point C.

[0027] In the figure, 1, shell; 11, frame; 111, first side plate; 1111, second plate body; 1112, second support plate; 1113, baffle; 112, second end plate; 1121, mounting groove; 1122, hollow groove; 1123, hollow hole; 113, accommodating cavity; 118, second side plate; 119, second end plate; 12, middle side plate; 121, plug-in part; 122, first plate body; 123, first support plate; 124, clamping space; 2, weld; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0028] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "first" and "second" are used in the present invention only for descriptive purposes to distinguish technical features of the same type, and cannot be understood as indicating or implying the relative importance, order and quantity of these technical features, that is, the "first" technical feature can be called the "second" technical feature, and the "second" technical feature can also be called the "first" technical feature, and the technical features defined as "first" and "second" can explicitly or implicitly include one or more of the technical features. In addition, unless otherwise specified, the meaning of "multiple" is two or more.

[0030] It should be emphasized that in the description of this application, unless otherwise clearly specified and limited, the term "connection" 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] like Figure 1-Figure 8 As shown, a shell 1 of an embodiment of the utility model includes: a frame 11, including a first side plate 111, a second side plate 118, a first end plate 112 and a second end plate 119, wherein the first side plate 111 and the second side plate 118 are arranged opposite to each other, the first end plate 112 and the second end plate 119 are arranged opposite to each other, and the first side plate 111, the second side plate 118, the first end plate 112 and the second end plate 119 are arranged circumferentially, and the adjacent plate ends are welded together to form a accommodating cavity 113, and at least one of the first end plate 112 and the second end plate 119 has a mounting groove 1121; a middle side plate 12 is arranged in the accommodating cavity 113, and the middle side plate 12 has a plug-in portion 121, the plug-in portion 121 is plugged into the mounting groove 1121, and is welded to the mounting groove 1121 on one side of the first direction X.

[0032] Based on the above scheme, the device adopts a single-sided welding method to weld the plug-in part 121 and the installation groove 1121 to achieve the connection between the middle side plate 12 and the end plate. The single-sided welding method is adopted. Even if the plug-in part 121 and the installation groove 1121 are welded and connected on one side of the first direction X, this setting can ensure that the weld 2 will not have a large internal stress during welding and cooling, thereby effectively solving the problem of welding cracks and pores in the weld 2, and ensuring that the welding tension of the weld 2 meets the requirements. In addition, the shell 1 does not need to be filled with wire during welding, and can also ensure that the welding tension meets the requirements, thereby ensuring welding efficiency and avoiding cost increases.

[0033] In this embodiment, the first direction X is the length extension direction of the end plate.

[0034] like Figure 4-Figure 8 As shown, in order to ensure that the laser can pass through the gap to melt the base material during welding, the length of the mounting groove 1121 in the first direction X is M, and the length of the plug-in portion 121 in the first direction X is N, MN≤0.3mm, that is, the assembly gap between the plug-in portion 121 and the mounting groove 1121 is controlled within 0.3mm. The masking setting can ensure that the laser can pass through the gap to melt the base material during welding, thereby avoiding causing obvious glue edges and depressions.

[0035] It should be noted that M and N can be measured by a vernier caliper.

[0036] In some embodiments, in order to facilitate assembly and ensure the connection strength between the middle side panel 12 and the end panel, the frame 11 includes side panels and end panels, wherein the side panels include a first side panel 111 and a second side panel 118, and the end panels include a first end panel 112 and a second end panel 119. The two end panels are correspondingly arranged along a first direction X, and the two side panels are correspondingly arranged along a third direction Z. The middle side panel 12 is provided with plug-in portions 121 on both sides of the third direction Z, and both end panels are provided with mounting grooves 1121. The two plug-in portions 121 are respectively inserted into the two mounting grooves 1121 to ensure the connection strength between the middle side panel 12 and the end panel.

[0037] In this embodiment, the third direction Z is the length extension direction of the middle side plate 12 and is perpendicular to the first direction X.

[0038] like Figure 5 As shown, in order to reduce the weight of the end plate, a hollow groove is provided on the end plate. In this embodiment, the first end plate 112 is taken as an example for description. The first end plate 112 has a mounting groove 1121, and the first end plate 112 also has a hollow groove 1122 on the side facing the middle side plate 12. The hollow groove 1122 extends along the second direction Y and penetrates the first end plate 112. The mounting groove 1121 is provided on the side of the hollow groove 1122 away from the middle side plate 12, and the plug-in portion 121 passes through the hollow groove 1122 and is plugged into the mounting groove 1121.

[0039] In other embodiments, the mounting groove and the hollow groove may be provided on the second end plate 119 , or may be provided on both the first end plate 112 and the second end plate 119 .

[0040] like Figure 5 and Fig. 9 As shown, in order to avoid the end plate from being broken at the hollow groove 1122 due to reducing the weight of the end plate, in the third direction Z, the distance from the side of the hollow groove 1122 away from the middle side plate 12 to the side of the first end plate 112 away from the middle side plate 12 is L1, 7mm≤L1≤10mm, and the strength of the end plate 112 is ensured by setting the hollow margin L1 to avoid breaking at the hollow groove 1122. The distance L1 is preferably 9mm.

[0041] It should be noted that L1 can be measured by a depth tester or a vernier caliper.

[0042] like Figure 5 As shown, in order to further reduce the weight of the end plate, the end plate further has a plurality of hollow holes 1123 arranged at intervals, and the hollow holes 1123 extend along the second direction Y and penetrate the end plate. The second direction Y is the height direction of the end plate.

[0043] like Fig.10 As shown, in order to facilitate the placement of the battery cells, the middle side plate 12 includes a first plate body 122 and a first support plate 123, the first plate body 122 extends along the third direction Z, and the plug-in portion 121 is arranged on one side of the first plate body 122 in the third direction Z, and the first support plate 123 is arranged on the bottom surface of the first plate body 122.

[0044] like Fig.11 and Fig.12 As shown, in order to facilitate the assembly of the middle side plate 12 and the end plate, in the third direction Z, the first support plate 123 protrudes from the first plate body 122 , and a clamping space 124 is formed between the plug-in portion 121 and the first support plate 123 .

[0045] like Figure 1 As shown, in order to facilitate the fixation of the battery cells, the side plate 111 includes a second plate body 1111, a second support plate 1112 and a baffle 1113; the second support plate 1112 is arranged on the side of the second plate body 1111 facing the middle side plate 12, and is arranged on the bottom surface of the second plate body 1111; the baffle 1113 is arranged on the side of the second plate body 1111 facing the middle side plate 12, and is arranged on the top surface of the second plate body 1111, and the baffle 1113 and the support plate cooperate to fix the battery cells.

[0046] Preferably, the second plate body 1111, the second support plate 1112 and the baffle 1113 can be integrally formed, for example, integrally formed by machine pressing, or fixed together by welding.

[0047] like Figure 7 As shown, for ease of assembly, the plug-in portion 121 is plugged into the mounting groove 1121 and is flush with the side of the end plate facing away from the first plate body 122 .

[0048] In order to achieve the same purpose, an embodiment of the utility model further provides a battery module, including a battery cell and the housing 1 as described above, wherein the battery cell is arranged in the accommodating cavity 113 .

[0049] The housing 1 of the present application is further described below using specific embodiments. The following embodiments are examples and do not limit the present application.

[0050] At the same time, relevant comparative examples are listed for comparison.

[0051] Example 1

[0052] like Figure 1 As shown, a shell 1 of the present embodiment includes: a frame 11, including a first side plate 111, a second side plate 118, a first end plate 112 and a second end plate 119, the two side plates and the two end plates together enclose a accommodating cavity 113, the two end plates both have a mounting groove 1121, and the length of the mounting groove 1121 in the first direction X is M; a middle side plate 12, arranged in the accommodating cavity 113, the middle side plate 12 has two plug-in parts 121, the two plug-in parts 121 are respectively plugged into the two mounting grooves 1121, and the plug-in parts 121 are welded to the mounting groove 1121 on one side of the first direction X, and the length of the plug-in part 121 in the first direction X is N, MN≤0.3mm.

[0053] It is particularly noted that in this embodiment, the middle side plate 12 and the two end plates are made of 6 series aluminum alloy, and the middle side plate 12 and the end plates are welded using an annular spot IPG 4000W+2000W laser. The thickness of the plug-in portion can be 1.5mm-2.5mm, and can also be adjusted according to actual needs. From the perspective of installation, the smaller the difference between the installation groove width M and the plug-in portion width N, the more conducive to welding, but the installation requirements are higher. Therefore, from the perspective of welding quality and installation convenience, the preferred value of MN can be 0.2mm.

[0054] Comparative Example 1

[0055] The difference between the housing 1 of the comparative example 1 and the housing 1 of the embodiment 1 is that MN>0.3 mm.

[0056] Comparative Example 2

[0057] The difference between the housing 1 of the comparative example 2 and the housing 1 of the embodiment 1 is that the plug-in portion 121 and the mounting groove 1121 are welded to each other on both sides of the first direction X, that is, double-sided welding is adopted.

[0058] In order to evaluate the shells 1 of the above-mentioned embodiment 1, comparative example 1 and comparative example 2, the shells 1 of embodiment 1, comparative example 1 and comparative example 2 are tested respectively to measure the welding tensile force of the weld 2 between the middle side plate 12 and the end plate 112.

[0059] Measurement steps:

[0060] For the housings 1 in Example 1, Comparative Example 1 and Comparative Example 2, 8 of each type were prepared and placed on a tension measuring device for welding tension testing.

[0061] The welding tensile force measurement results are shown in Table 1:

[0062] Table 1

[0063] Example 1 / N Comparative Example 1 / N Comparative Example 2 / N 1 23880 17803 16210 2 20123 18327 15714 3 21085 17501 17011 4 19971 16958 16872 5 21884 18014 16045 6 22437 17290 15920 7 20786 17743 16116 8 23260 16731 16439

[0064] Measurement conclusion:

[0065] 1. In the housing 1 in Example 1, the welding tensile force of the weld 2 between the middle side plate 12 and the end plate is the largest, that is, the assembly gap between the plug-in portion 121 and the mounting groove 1121 is controlled at 0.3 mm, and a single-sided welding connection method is adopted, which can ensure that during welding, the laser can pass through the gap to melt the parent material, avoiding obvious glue edges and depressions, and can also reduce the internal stress of the weld 2, effectively solving the problem of welding cracks and pores in the weld 2, and ensuring that the welding tensile force of the weld 2 meets the requirements;

[0066] 2. By observing the housing 1 in comparative example 1, it can be found that when the assembly gap is too large, there is a large restraint force between the middle side plate 12 and the end plate during welding, which causes the weld 2 to crack during the cooling process, thereby reducing the welding tension;

[0067] 3. By observing the housing 1 of comparative example 2, it can be found that the use of bilateral welding, that is, the plug-in portion 121 and the mounting groove 1121 are welded and connected on both sides of the first direction X, will cause a large internal stress in the weld 2 during the welding and cooling process, thereby causing the weld 2 to have surface cracks.

[0068] In summary, the embodiment of the utility model provides a shell 1 and a battery module, which realize the connection between the middle side plate 12 and the end plate through the cooperation of the plug-in part 121 and the installation groove 1121. Specifically, the assembly gap between the plug-in part 121 and the installation groove 1121 is controlled within 0.3mm, even if MN≤0.3mm, and a single-sided welding method is adopted, even if the plug-in part 121 and the installation groove 1121 are welded and connected on one side of the first direction X, such an arrangement can ensure that during welding, the laser can pass through the gap to melt the parent material, avoiding obvious glue edges and depressions, and can also reduce the internal stress of the weld 2, effectively solving the problem of welding cracks and pores in the weld 2, and ensuring that the welding tensile force of the weld 2 meets the requirements. In addition, the shell 1 does not need to be filled with wire during welding, and can also ensure that the welding tensile force meets the requirements, thereby ensuring welding efficiency and avoiding cost increases.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A housing (1), characterized in that: include: A frame (11), comprising a first side plate (111), a second side plate (118), a first end plate (112) and a second end plate (119); the first side plate (111), the second side plate (118), the first end plate (112) and the second end plate (119) are arranged along the circumferential direction and enclosed to form a receiving cavity, wherein the first side plate (111) and the second side plate (118) are arranged opposite to each other, the first end plate (112) and the second end plate (119) are arranged opposite to each other, and at least one of the first end plate (112) and the second end plate (119) has a mounting groove (1121); A middle side plate (12) is arranged in the accommodating cavity (113), wherein the middle side plate (12) has an inserting portion (121), wherein the inserting portion (121) is inserted into the mounting groove (1121) and is welded to the mounting groove (1121) on one side in a first direction (X).

2. The housing (1) according to claim 1, characterized in that The length of the installation groove (1121) in the first direction (X) is M, the length of the plug-in portion (121) in the first direction (X) is N, and MN≤0.3 mm.

3. The housing (1) according to claim 1, characterized in that The first end plate (112) has the installation groove (1121), and the first end plate (112) further has a hollow groove (1122) on the side facing the middle side plate (12), and the hollow groove (1122) extends along the second direction (Y) and penetrates the first end plate (112), and the installation groove (1121) is arranged on the side of the hollow groove (1122) away from the middle side plate (12), and the plug-in portion (121) passes through the hollow groove (1122) and is plugged into the installation groove (1121).

4. The housing (1) according to claim 3, characterized in that In the third direction (Z), the distance from the side of the hollow groove (1122) away from the middle side plate (12) to the side of the first end plate (112) away from the middle side plate (12) is L1, 7mm≤L1≤10mm.

5. The housing (1) according to claim 1, characterized in that The first end plate (112) and / or the second end plate (119) further has a plurality of hollow holes (1123) arranged at intervals, and the hollow holes (1123) extend along the second direction (Y) and penetrate the end plate (112).

6. The housing (1) according to claim 1, characterized in that The middle side plate (12) comprises a first plate body (122) and a first supporting plate (123), wherein the first plate body (122) extends along a third direction (Z), and the plug-in portion (121) is arranged on one side of the first plate body (122) in the third direction (Z), and the first supporting plate (123) is arranged on the bottom surface of the first plate body (122).

7. The housing (1) according to claim 6, characterized in that In the third direction (Z), the first support plate (123) protrudes from the first plate body (122), and a clamping space (124) is formed between the plug-in portion (121) and the first support plate (123).

8. The housing (1) according to claim 1, characterized in that The first side plate (111) or the second side plate (118) comprises a second plate body (1111), a second supporting plate (1112) and a baffle (1113); The second supporting plate (1112) is arranged on a side of the second plate body (1111) facing the middle side plate (12), and is arranged on the bottom surface of the second plate body (1111); The baffle (1113) is arranged on a side of the second plate body (1111) facing the middle side plate (12), and is arranged on the top surface of the second plate body (1111).

9. The housing (1) according to claim 6, characterized in that The mounting groove (1121) is arranged on the first end plate (112), and the plug-in portion (121) is plugged into the mounting groove (1121) and is flush with a side of the first end plate (112) facing away from the first plate body (122).

10. A battery module, characterized in that: It comprises a battery cell and a housing (1) as claimed in any one of claims 1 to 9, wherein the battery cell is arranged in the accommodating cavity (113).

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