Box body of battery pack and battery pack

Abstract

The utility model provides a battery pack box and battery pack, the battery pack box comprises a plate body and a beam body, the beam body comprises a connecting part and a middle part, the connecting part is connected with the plate body, the middle part is connected with one side of the connecting part deviating from the plate body, in the extension direction of the plate body, at least one side of the connecting part is provided with a protruding part protruding out of the middle part, and the plate body is provided with a groove. The protruding part is welded to the plate body to form a welding seam, and the welding seam is connected to the side, away from the plate body, of the protruding part. By arranging the protruding part on the beam body, when the beam body and the plate body are welded, welding mainly occurs between the protruding part and the plate body, the protruding part is relatively thin and small in heat capacity, and the protruding part is prone to temperature rise and reaches the melting temperature, so that a welding seam is formed, and it is ensured that when the beam body reaches the needed fusion depth, the temperature rise of the plate body is still kept within the allowable range; and the risks of overheating and weld penetration are avoided. Therefore, the demand balance between the beam body welding penetration depth and the plate body welding penetration prevention can be realized, the plate body welding penetration risk is reduced, and the welding quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding technical field, concretely relates to battery package's box and battery package. BACKGROUND

[0002] In the related art, the bottom plate is thin and the cross beam is thick in the welding process of the battery package, which makes the heat conduction performance and heat capacity of the two different. Specifically, the thicker cross beam has larger heat capacity and the temperature rises slowly when absorbing more heat; and the thin bottom plate has smaller heat capacity and the temperature rises faster under the same condition.

[0003] When the welding track is at the intersection angle position of the cross beam and the bottom plate, the thickness difference will cause uneven heat absorption. If the cross beam needs to reach the appropriate welding penetration, more heat input is necessary due to the thicker cross beam, and at this time, the nearby bottom plate will absorb more heat, and too much heat may cause the temperature of the bottom plate to exceed the melting point, thereby causing the welding-through phenomenon. SUMMARY

[0004] The embodiment of the utility model provides a kind of battery package's box and battery package, can improve the technical problem that the beam body and plate body of battery package in the related art are welded, and plate body is prone to welding-through.

[0005] First, the embodiment of the utility model provides a kind of battery package's box, and the box of battery package includes:

[0006] Plate body;And,

[0007] Beam body, including connecting portion and intermediate portion, the connecting portion is connected with the plate body, the intermediate portion is connected to the side of the connecting portion away from the plate body, in the extension direction of the plate body, at least one side of the connecting portion has the protruding portion arranged protruding the intermediate portion, the protruding portion is welded with the plate body, to form weld, the weld is connected to the side of the protruding portion away from the plate body.

[0008] In an embodiment, the beam body further includes a main body portion connected to the side of the intermediate portion away from the connecting portion, in the extension direction of the plate body, the same side of the main body portion and the connecting portion is arranged protruding the intermediate portion.

[0009] In an embodiment, in the thickness direction of the plate body, the size of the protruding portion is between 1.5mm to 2.5mm.

[0010] In an embodiment, in the extension direction of the plate body, the distance of the protruding portion protruding the intermediate portion is between 2mm to 4mm.

[0011] In one embodiment, the size of the middle portion is between 6 mm and 8 mm in the thickness direction of the plate.

[0012] In one embodiment, the orthographic projection of the weld on the beam in the thickness direction of the plate is equivalent to the orthographic projection of the weld on the plate in the extension direction of the plate.

[0013] In one embodiment, the orthographic projection of the weld on the beam has a dimension between 5 mm and 7 mm in the thickness direction of the plate.

[0014] In one embodiment, in the extension direction of the plate, both sides of the connecting portion protrude from the middle portion, and two welds are formed accordingly.

[0015] In one embodiment, the protrusion has a first side facing away from the plate and a second side facing away from the beam;

[0016] The centerline of the weld width intersects with the end of the first side adjacent to the second side, or the centerline of the weld width intersects with the end of the second side adjacent to the first side.

[0017] Secondly, embodiments of the present invention provide a battery pack, which includes the aforementioned battery pack housing.

[0018] The beneficial effects of the embodiments of this utility model are as follows:

[0019] In this embodiment of the invention, by providing a protrusion in the beam, when the beam is welded to the plate, the welding mainly occurs between the protrusion and the plate. Because the protrusion is relatively thin and has a small heat capacity, it easily heats up and reaches its melting temperature, thus forming a weld. This ensures that when the beam reaches the required weld penetration, the temperature rise of the plate remains within an acceptable range, avoiding the risks of overheating and burn-through. In this way, a balance can be achieved between the required weld penetration of the beam and the prevention of burn-through in the plate, reducing the risk of burn-through and improving welding quality. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a perspective view of the battery pack housing provided in an embodiment of the present invention;

[0022] Figure 2 is a sectional view of a structure of a beam body and a plate body provided by an embodiment of the present application;

[0023] Figure 3 is Figure 2 an enlarged view of a partial A in the structure;

[0024] Figure 4 is a sectional view of another structure of a beam body and a plate body provided by an embodiment of the present application;

[0025] Figure 5 is Figure 4 an enlarged view of a partial B in the structure;

[0026] Figure 6 is a three-dimensional view of a battery pack provided by an embodiment of the present application.

[0027] Reference signs:

[0028] 1000, battery pack; 100, box body; 1, plate body; 2, beam body; 21, connecting part; 211, protruding part; 2111, first side; 2112, second side; 22, middle part; 23, main body part; 3, welding seam; 200, box cover. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person skilled in the art without creative labor fall within the protection scope of the present application. In addition, it should be understood that the specific embodiments described herein are only used for illustrating and explaining the present application, and are not used for limiting the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing in the drawings. And "inner" and "outer" refer to the contour of the device.

[0030] The present application provides a box body of a battery pack, Figures 1 to 5 for some embodiments of the present application.

[0031] Please refer to Figure 1 In some embodiments of the present application, the box body 100 of the battery pack 1000 comprises a plate body 1 and a beam body 2.

[0032] See Figure 2 and Figure 3 , or Figure 4 and Figure 5The beam 2 includes a connecting part 21 and a middle part 22. The connecting part 21 is connected to the plate 1, and the middle part 22 is connected to the side of the connecting part 21 away from the plate 1. In the extension direction of the plate 1 (left and right direction in the figure), at least one side of the connecting part 21 has a protrusion 211 that protrudes from the middle part 22. The protrusion 211 is welded to the plate 1 to form a weld 3. The weld 3 is connected to the side of the protrusion 211 away from the plate 1.

[0033] In the technical solution of this application, by providing a protrusion 211 in the beam body 2, when the beam body 2 is welded to the plate body 1, the welding mainly occurs between the protrusion 211 and the plate body 1. Since the protrusion 211 is relatively thin and has a small heat capacity, it easily heats up and reaches its melting temperature, thus forming a weld 3. This ensures that when the beam body 2 reaches the required penetration depth, the temperature rise of the plate body 1 remains within an acceptable range, avoiding the risk of overheating and burn-through. In this way, a balance can be achieved between the required penetration depth of the beam body 2 and the prevention of burn-through in the plate body 1, reducing the risk of burn-through in the plate body 1 and improving the welding quality.

[0034] Understandably, weld 3 can also be connected to the intermediate part 22. When weld 3 can be connected to the intermediate part 22, a larger range of connection is established between plate 1, protrusion 211 and intermediate part 22, increasing the connection path between plate 1 and beam 2. More connection paths can improve the overall load-bearing capacity of the structure, thereby improving the welding strength between plate 1 and beam 2.

[0035] In some embodiments of this application, see Figure 3 The beam 2 also includes a main body 23, which is connected to the side of the intermediate part 22 opposite to the connecting part 21. In the extension direction of the plate 1 (left-right direction in the figure), the main body 23 and the connecting part 21 protrude from the intermediate part 22 on the same side. In these embodiments, the main body 23 and the connecting part 21 protruding from the intermediate part 22 on the same side increases the overall structural stability of the beam 2 in the extension direction of the plate 1, enhances the mechanical strength of the beam 2, and improves the impact resistance of the entire box 100.

[0036] In some embodiments of this application, see Figure 3In the thickness direction of the plate body 1 (up and down direction in the figure), the size (a in the figure) of the protruding portion 211 is between 1.5 mm and 2.5 mm. In these embodiments, the size range of the protruding portion 211 in the thickness direction of the plate body 1 has an important influence on the welding effect. If the size of the protruding portion 211 is too small, it can lead to too small heat capacity during welding, making it difficult to form a stable weld 3, or the protruding portion 211 can be completely melted before the required penetration of the beam body 2 is reached, affecting the welding quality. If the size is too large, the temperature rise of the protruding portion 211 will be slower under the same welding energy, resulting in an increase in welding time, and too much heat can be conducted to the plate body 1, increasing the risk of the plate body 1 being welded through. This size range is determined by taking into account welding efficiency, penetration control and protection of the plate body 1, etc. It helps to ensure that the temperature rise of the plate body 1 is within the allowable range while meeting the penetration requirements of the beam body 2, improving the success rate and quality of welding.

[0037] In some embodiments of the present application, see Figure 3 In the extension direction of the plate body 1 (left and right direction in the figure), the distance (b in the figure) of the protruding portion 211 protruding from the middle portion 22 is between 2 mm and 4 mm. In these embodiments, the distance of the protruding portion 211 protruding from the middle portion 22 in the extension direction of the plate body 1 has an important influence on the realization of the technical effect, as well as the connection strength of the beam body 2 and the plate body 1. If the distance is too small, it can lead to an increase in the proportion of heat conducted to the middle portion 22, and the thicker middle portion 22 will have a slower temperature rise, making it difficult for the beam body 2 to reach the penetration. Correspondingly, there is a risk of the plate body 1 being welded through. If the distance is too large, it will affect the compactness of the overall structure of the beam body 2, and it will be difficult to accurately control the heat concentration in the protruding portion 211 during welding, which can lead to uneven welding, affecting the quality of the weld 3 and the penetration control of the beam body 2, and can lead to uneven stress transmission between the plate body 1 and the beam body 2 when subjected to external forces, thereby affecting the connection strength of the beam body 2 and the plate body 1, and thus affecting the structural strength of the box body 100. Therefore, the distance range of the protruding portion 211 protruding from the middle portion 22 in the extension direction of the plate body 1 is between 2 mm and 4 mm, which helps to control the heat concentration area during welding, ensures that the weld 3 is mainly formed between the protruding portion 211 and the plate body 1, realizes the balance between the welding penetration of the beam body 2 and the plate body 1 not being welded through, and guarantees the connection strength of the plate body 1 and the beam body 2, thereby guaranteeing the structural strength of the box body 100.

[0038] In some embodiments of the present application, see Figure 3In the thickness direction of the plate body 1 (the up-down direction in the figure), the size (c in the figure) of the intermediate portion 22 is between 6 mm and 8 mm. In these embodiments, the size range of the intermediate portion 22 in the thickness direction of the plate body 1 has an influence on the overall structural strength of the beam body 2 and the heat conduction during welding. In welding, the size of the intermediate portion 22 affects the heat conduction path and speed from the protruding portion 211 to other parts of the beam body 2 (such as the main body portion 23). If the size is too small, the heat is quickly transferred to the thicker main body portion 23, and the beam body 2 is not easy to reach the penetration, and correspondingly, there is a risk of welding through the plate body 1. If the size is too large, the intermediate portion 22 will become a relatively weak part of the beam body 2, affecting the overall structural strength of the beam body 2. Therefore, the size of the intermediate portion 22 in the thickness direction of the plate body 1 is between 6 mm and 8 mm, achieving a balance between the welding penetration of the beam body 2 and the non-welding through of the plate body 1, and ensuring the overall structural strength of the beam body 2, thereby ensuring the structural strength of the box body 100.

[0039] In some embodiments of the present application, see Figure 3 , the size (d in the figure) of the orthographic projection of the weld 3 on the beam body 2 in the thickness direction of the plate body 1 is equivalent to the size (e in the figure) of the orthographic projection of the weld 3 on the plate body 1 in the extension direction of the plate body 1. In these embodiments, the size of the orthographic projection of the weld 3 on the beam body 2 in the thickness direction of the plate body 1 is equivalent to the size of the orthographic projection of the weld 3 on the plate body 1 in the extension direction of the plate body 1, and the growth of the weld 3 in the two directions is balanced. In the welding process, this means that the heat conduction effect in the thickness direction and the extension direction of the plate body 1 is similar, which helps to form a uniform weld 3. The uniform weld 3 can better withstand stress, improve the strength and sealing performance of the welding joint, prevent leakage or structural damage due to uneven weld 3 during use, and thereby enhance the overall performance of the battery pack 1000 box body 100.

[0040] In some embodiments of the present application, see Figure 3 , the size (d in the figure) of the orthographic projection of the weld 3 on the beam body 2 in the thickness direction of the plate body 1 is between 5 mm and 7 mm. In these embodiments, the size range of the orthographic projection of the weld 3 on the beam body 2 in the thickness direction of the plate body 1 has an important influence on the strength and sealing performance of the weld 3. If the size is too small, the cross-sectional area of the weld 3 is small, which may not be able to withstand large stress and is prone to breakage, and at the same time, the sealing performance is difficult to guarantee. If the size is too large, it may cause too much heat to be conducted to the plate body 1 during welding, increasing the risk of welding through the plate body 1, and may also make the welding structure bulky, not meeting the requirement of compact structure. Therefore, the size of the orthographic projection of the weld 3 on the beam body 2 in the thickness direction of the plate body 1 is between 5 mm and 7 mm, which can avoid the risk of welding through the plate body 1 and ensure the strength and sealing performance of the weld 3.

[0041] In some embodiments of the present application, see Figure 3 or Figure 5 In the extension direction of the plate body 1, the protruding part 22 is arranged on both sides of the connecting part 21, and two weld seams 3 are formed correspondingly. In these embodiments, the design of the two weld seams 3 increases the stability of the connection between the beam body 2 and the plate body 1. When subjected to external force, the two weld seams 3 can share the stress, improve the reliability of the connection, further improve the strength and sealing performance of the connection between the beam body 2 and the plate body 1, and overall enhance the structural performance of the battery pack 1000 box 100.

[0042] In some embodiments of the present application, see Figure 5 The protruding part 211 has a first side 2111 facing away from the plate body 1 and a second side 2112 facing away from the beam body 2; the middle line (L in the figure) of the width of the weld seam 3 intersects one end of the first side 2111 adjacent to the second side 2112 (as shown in Figure 5 ), or the middle line (L in the figure) of the width of the weld seam 3 intersects one end of the second side 2112 adjacent to the first side 2111 (that is, L in the figure is slightly offset downward). In these embodiments, this design helps to accurately control the position and shape of the weld seam 3, and the specific intersection relationship between the middle line of the weld seam 3 and the side of the protruding part 211 can ensure that the protruding part 211 is relatively centered in the width direction of the weld seam 3, ensure that the weld seam 3 is mainly formed between the protruding part 211 and the plate body 1, and ensure that the temperature rise of the plate body 1 still remains within the allowable range when the beam body 2 reaches the required penetration, avoiding the risk of overheating and weld-through. In this way, the balance between the welding penetration of the beam body 2 and the non-weld-through of the plate body 1 can be achieved, the risk of weld-through of the plate body 1 is reduced, and the welding quality is improved.

[0043] See Figure 6 The present application also provides a battery pack 1000, which comprises a box 100, and the box 100 of the battery pack 1000 is as described above. Since the battery pack 1000 adopts all the technical solutions of the above-mentioned embodiments, it at least has the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. It can be understood that the battery pack 1000 also comprises a box cover 200, which is arranged on the opening of the box 100 to define a cavity for mounting a battery module.

[0044] The embodiments of the present application are described in detail above, and the principles and implementation modes of the present application are described by applying specific examples. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A battery pack housing, characterized in that, include: plate body; as well as, The beam includes a connecting portion and a middle portion. The connecting portion is connected to the plate body, and the middle portion is connected to the side of the connecting portion opposite to the plate body. In the extension direction of the plate body, at least one side of the connecting portion has a protrusion that protrudes from the middle portion. The protrusion is welded to the plate body to form a weld, and the weld is connected to the side of the protrusion opposite to the plate body.

2. The casing of the battery pack according to claim 1, characterized in that, The beam also includes a main body, which is connected to the side of the intermediate part away from the connecting part. In the extension direction of the plate, the main body and the connecting part protrude from the intermediate part on the same side.

3. The housing of the battery pack according to claim 1, characterized in that, In the thickness direction of the plate, the size of the protrusion is between 1.5 mm and 2.5 mm.

4. The casing of the battery pack according to claim 1, characterized in that, In the extension direction of the plate, the distance by which the protrusion protrudes from the middle part is between 2 mm and 4 mm.

5. The housing of the battery pack according to claim 1, characterized in that, In the thickness direction of the plate, the size of the middle part is between 6 mm and 8 mm.

6. The housing of the battery pack according to claim 1, characterized in that, The orthographic projection of the weld on the beam is equivalent in the thickness direction of the plate to the orthographic projection of the weld on the plate in the extension direction of the plate.

7. The housing of the battery pack according to claim 6, characterized in that, The orthographic projection of the weld on the beam has a dimension between 5 mm and 7 mm in the thickness direction of the plate.

8. The housing of the battery pack according to any one of claims 1-7, characterized in that, In the extension direction of the plate, both sides of the connecting part protrude from the middle part, and two welds are formed accordingly.

9. The casing of the battery pack according to any one of claims 1-7, characterized in that, The protrusion has a first side facing away from the plate and a second side facing away from the beam; The centerline of the weld width intersects with the end of the first side adjacent to the second side, or the centerline of the weld width intersects with the end of the second side adjacent to the first side.

10. A battery pack, characterized in that, The housing includes the battery pack as described in any one of claims 1-9.

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