Battery box and battery pack

Abstract

The utility model provides a battery box and a battery pack, and relates to the technical field of batteries. The battery box provided by the embodiment of the utility model comprises a box body and a partition plate, and the partition plate is arranged in an accommodating cavity of the box body so as to divide the accommodating cavity into at least two chambers. The partition plate is provided with a side face facing the cavity and a lower end face facing the bottom plate, and the lower end face is connected with the side face through a chamfered face. The partition plate is welded to the bottom plate, and a weld joint is located between the chamfer face and the bottom plate. After the lower end face of the partition plate abuts against the bottom plate, a wedge-shaped gap is formed between the chamfered face and the surface of the bottom plate, and a welding seam formed by welding is located in the wedge-shaped gap, so that the welding seam cannot protrude into a space for placing the battery cell module, and cannot interfere with the battery cell module. Therefore, when the battery box provided by the embodiment of the utility model is used for accommodating the battery cell module, the battery cell module can be stably placed in the cavities separated by the partition plates, so that the overall structural stability of a battery pack is good.

Description

Technical Field

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

[0002] Some existing battery packs use CTP (cell to pack) technology, and the battery cell modules are housed in the battery box. Some existing battery boxes use partitions to divide the internal space, and the partitions are usually fixed by welding, such as laser welding or arc welding. Arc welding will produce a weld of about 5 mm, and the weld here is not easy to grind. Although the laser welding weld is not obvious, the roughness of the weld is relatively large. Therefore, traditional welding methods will cause the weld to interfere with the battery cell module, which makes it difficult to install the battery cell module smoothly, making the overall structural stability of the battery pack poor. Utility Model Content

[0003] The utility model aims to provide a battery box and a battery pack, which can improve the problem that the weld seam in the battery box easily interferes with the battery cell module due to welding, so that the overall structural stability of the battery pack is better.

[0004] The embodiment of the utility model is achieved as follows:

[0005] In a first aspect, the utility model provides a battery box for accommodating a battery cell module, the battery box comprising:

[0006] A box body, the box body includes a bottom plate and a surrounding plate arranged on the bottom plate, the bottom plate and the surrounding plate together form a containing cavity of the box body, and the bottom plate is used to support the battery cell module; and,

[0007] A partition is arranged in the accommodating cavity to divide the accommodating cavity into at least two chambers. The partition has a side surface facing the chamber and a lower end surface facing the bottom plate. The lower end surface and the side surface are connected by a chamfered surface. The partition is welded to the bottom plate and the weld is located between the chamfered surface and the bottom plate.

[0008] In an optional embodiment, the width of the chamfered surface projected on the bottom plate is greater than 5 mm.

[0009] In an optional embodiment, the enclosure includes two first side beams spaced opposite to each other in a first direction, the partition extends along the first direction and the two ends of the partition are respectively connected to the two first side beams; an avoidance groove is provided on the inner side of the first side beam, and the end of the partition is inserted into the avoidance groove.

[0010] In an optional embodiment, the first side beam and the partition are connected by welding or by fasteners.

[0011] In an optional embodiment, the enclosure further includes second side beams spaced opposite to each other in a second direction, the first direction is perpendicular to the second direction, and the enclosure and the bottom plate together form a rectangular accommodating cavity.

[0012] In an optional embodiment, a step portion is protrudingly provided on the inner wall surface of the enclosure, and the step portion abuts against the upper surface of the base plate.

[0013] In an optional embodiment, a liquid cooling channel for cooling liquid to flow is provided in the base plate.

[0014] In an optional embodiment, the enclosure plate and the base plate are connected by welding or by fasteners.

[0015] In an optional embodiment, the enclosure and / or partition is a hollow structure, and reinforcing ribs are provided inside the enclosure and / or partition.

[0016] In a second aspect, the present application provides a battery pack, comprising a battery cell module and a battery box according to any one of the embodiments of the first aspect, wherein the battery cell module is disposed in a cavity.

[0017] In an optional embodiment, the battery cell module is adhered to the base plate.

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

[0019] The battery box provided in the embodiment of the present application includes a box body and a partition, the partition has a side facing the chamber and a lower end face facing the bottom plate, the lower end face is connected to the side face by a chamfered surface, the partition is welded to the bottom plate and the weld is located between the chamfered surface and the bottom plate, because the chamfered surface is provided between the lower end face and the side face of the partition, when the lower end face of the partition abuts against the bottom plate, a wedge-shaped gap is formed between the chamfered surface and the surface of the bottom plate, and the weld formed by welding is located in the wedge-shaped gap, so that the weld will not protrude into the space for placing the battery cell module, and therefore will not interfere with the battery cell module. Therefore, when the battery box provided in the embodiment of the present application is used to accommodate the battery cell module, the battery cell module can be stably placed in each chamber separated by the partition, so that the overall structural stability of the battery pack is good.

[0020] The battery pack provided in the embodiment of the present application includes a battery cell module and the above-mentioned battery box, the battery cell module is arranged in the cavity, and the battery pack has a compact structure and good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of a battery pack in one embodiment of the present application;

[0023] Figure 2 This is a schematic diagram of a battery box in one embodiment of the present application;

[0024] Figure 3 This is an exploded view of a battery box in one embodiment of the present application;

[0025] Figure 4 A cross-sectional view of a battery box in one embodiment of the present application;

[0026] Figure 5 for Figure 4 A magnified view of the local V in the middle;

[0027] Figure 6 for Figure 4 A magnified view of the local VI.

[0028] Icon: 010-battery pack; 100-battery box; 110-bottom plate; 120-first side beam; 121-avoidance groove; 130-second side beam; 140-partition; 141-side surface; 142-lower end surface; 143-chamfered surface; 144-reinforcement rib; 145-wedge-shaped gap; 150-step portion; 200-battery cell module. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 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 the present invention can be understood according to specific circumstances.

[0035] In some existing battery boxes, if a partition is welded on the bottom plate to divide the internal space of the battery box, a weld will be produced at the connection between the bottom plate and the partition. Arc welding will produce a weld of about 5 mm, and the weld here is not easy to grind, which will occupy a certain space inside the battery box and easily interfere with the battery module; although the laser welding weld is not obvious, the roughness of the welding is relatively large, which can still easily cause wear of the battery module. Therefore, traditional welding methods will cause the weld to have a negative impact on the battery module, such as making it difficult to install the battery module smoothly, and the battery module wear, etc., making the overall structural stability and safety of the battery pack poor.

[0036] In order to improve the problems caused by the partition welding method in the above-mentioned prior art, an embodiment of the present application provides a battery box and a battery pack, by setting a chamfer at the lower end of the partition, welding is performed between the chamfer and the bottom plate, and the chamfer is used to accommodate the weld so that the weld will not interfere with the battery cell module, thereby improving the structural stability and safety of the battery pack.

[0037] Figure 1 This is a schematic diagram of a battery pack 010 in one embodiment of the present application; Figure 2 This is a schematic diagram of a battery box 100 in one embodiment of the present application; Figure 3 FIG. 1 is an exploded view of a battery box 100 in one embodiment of the present application. Figures 1 to 3 As shown, the battery pack 010 provided in the embodiment of the present application includes a battery box 100 and a battery cell module 200, and the battery cell module 200 is accommodated in the battery box 100. The battery cell module 200 is a core component of the battery pack 010, and is used for energy storage and power supply. The battery box 100 is used to protect the battery cell module 200 to prevent it from being subjected to external impact and pollution. The battery cell module 200 can be fixed to the base plate 110 by bonding to prevent it from shaking at will in the battery box 100. In order to improve the heat transfer efficiency between the battery cell module 200 and the base plate 110, a thermally conductive structural adhesive can be used for bonding.

[0038] The battery box 100 provided in the embodiment of the present application includes a box body and a partition 140. Among them, the box body includes a bottom plate 110 and a surrounding plate arranged on the bottom plate 110, and the bottom plate 110 and the surrounding plate together enclose a receiving cavity of the box body, and the bottom plate 110 is used to support the battery cell module 200. The partition 140 is arranged in the receiving cavity of the box body to divide the receiving cavity into at least two chambers, and a plurality of battery cell modules 200 can be accommodated in these chambers. The bottom plate 110 and the surrounding plate can be made of the same material (such as 6 series aluminum alloy) to ensure the feasibility of welding. The bottom plate 110 and the surrounding plate can be connected by stir friction welding or bolt fixing.

[0039] In this embodiment, the bottom plate 110 is rectangular, and the bottom plate 110 has two sides extending along a first direction A and two sides extending along a second direction B, and the first direction A is perpendicular to the second direction B. Specifically, the enclosure of the battery box 100 is arranged along the edge of the bottom plate 110, so that the bottom plate 110 and the enclosure together enclose a rectangular accommodating cavity. The enclosure includes two first side beams 120 spaced opposite to each other in the first direction A and second side beams 130 spaced opposite to each other in the second direction B, and the partition 140 extends along the first direction A and the two ends of the partition 140 are respectively connected to the two first side beams 120.

[0040] Specifically, in this embodiment, in order to enhance the connection stability between the partition 140 and the first side beam 120, an escape groove 121 is provided on the inner side of the first side beam 120, and the two ends of the partition 140 in the first direction A are inserted into the escape groove 121. In order to facilitate the installation of the partition 140, the escape groove 121 extends along the depth direction of the battery box 100, and the upper end of the escape groove 121 passes through the top surface of the first side beam 120, and the lower end of the escape groove 121 extends to the bottom plate 110. In this way, the partition 140 can be inserted downward to the bottom plate 110 along the opening at the upper end of the escape groove 121 during installation. The escape groove 121 can also realize the pre-fixation of the partition 140, so as to facilitate the subsequent welding of the partition 140 and the bottom plate 110.

[0041] In other optional embodiments, the connection method between the partition plate 140 and the first side beam 120 can be adjusted as needed. For example, bonding, clamping, welding, direct abutment, etc. can be adopted, or a sheet metal bracket can be fixed with a blind rivet. In some other embodiments, the partition plate 140 may not even be connected to the first side beam 120.

[0042] The number of the partitions 140 may be more than two, and the more than two partitions 140 are arranged in parallel and spaced apart in the second direction B. In this embodiment, three partitions 140 are arranged in the battery box 100; in other embodiments, one, two, four or even more partitions 140 may be arranged.

[0043] Optionally, the battery box 100 may further include a cover plate (not shown in the figure), which can be detachably connected to the opening of the box body to better protect the battery cell module 200.

[0044] In the embodiment of the present application, the partition 140 is connected to the bottom plate 110 by welding. Figure 4 This is a cross-sectional view of a battery box 100 in one embodiment of the present application; Figure 5 for Figure 4 The enlarged view of the local V in . Figure 4 , Figure 5 As shown, the partition 140 divides the accommodating cavity of the battery box 100 into a plurality of chambers, and the partition 140 has a side surface 141 facing the chamber and a lower end surface 142 facing the bottom plate 110. The lower end surface 142 is connected to the side surface 141 through a chamfered surface 143, and the partition 140 is welded to the bottom plate 110, and the weld is located between the chamfered surface 143 and the bottom plate 110.

[0045] In this embodiment, the chamfered surface 143 is an inclined surface, which is inclined to the side surface 141 and the lower end surface 142 of the partition 140. Optionally, the chamfered surface 143 is a plane, the normal vector of the chamfered surface 143 faces the bottom plate 110, and has an angle of 30° to 60° (for example, it can be 45°) with the bottom plate 110. It can be understood that the chamfered surface 143 faces the bottom plate 110, so that a wedge-shaped gap 145 is formed between the chamfered surface 143 and the upper surface of the bottom plate 110, and the battery cell module 200 will hardly enter the wedge-shaped gap 145 when placed in the battery box 100. Therefore, when the weld is accommodated in the wedge-shaped gap 145 between the chamfered surface 143 and the bottom plate 110, it will not interfere with the battery cell module 200.

[0046] In this embodiment, the width of the projection of the chamfered surface 143 on the bottom plate 110 is greater than 5 mm. Since the chamfered surface 143 is a strip-shaped surface extending along the length direction (first direction A) of the partition 140, in this embodiment, the width of the projection of the chamfered surface 143 on the bottom plate 110 is the size of the projection in the thickness direction of the partition 140, that is, the size in the second direction B. By setting the width of the projection of the chamfered surface 143 on the bottom plate 110 to be greater than 5 mm, the weld generated during welding can be well accommodated in the wedge-shaped gap 145 between the chamfered surface 143 and the bottom plate 110, avoiding the weld from interfering with the battery cell module 200.

[0047] The welding between the partition 140 and the bottom plate 110 may be performed by multi-point welding; or a weld having a size equivalent to the length of the partition 140 may be formed along the length direction of the partition 140 to improve the welding strength.

[0048] In this embodiment, the chamfered surfaces 143 are provided on both sides of the partition 140 in the thickness direction, and both sides of the partition 140 are welded, thereby improving the connection strength between the partition 140 and the bottom plate 110. Optionally, the two chamfered surfaces 143 are symmetrically arranged. In other optional embodiments, the chamfered surface 143 can also be a curved surface, such as a round chamfer protruding toward the bottom plate 110.

[0049] In order to reduce the weight of the battery box 100, optionally, the enclosure and / or partition 140 is a hollow structure. In order to ensure the strength of the enclosure and / or partition 140 at the same time, a number of reinforcing ribs 144 may be provided in the enclosure and / or partition 140. In this embodiment, reinforcing ribs 144 are provided in the first side beam 120, the second side beam 130 and the partition 140. The thickness of the enclosure and partition 140 and the distribution of the reinforcing ribs 144 therein can be adjusted according to the overall requirements of the specific battery pack 010. By changing the shape of the reinforcing ribs 144, the expansion force generated by the battery cell module 200 during the expansion process is buffered, thereby ensuring that the overall stiffness of the battery pack 010 meets the requirements of simulation and experiments.

[0050] Furthermore, the enclosure (including the first side beam 120 and the second side beam 130) and the bottom plate 110 can be connected by welding or by fasteners (such as bolts, rivets), or by clamping, bonding, etc. When the enclosure and the bottom plate 110 are connected by welding, the partition 140 and the bottom plate 110 can also be welded, that is, the chamfered surface 143 is provided to avoid the interference of the weld with the battery cell module 200.

[0051] Figure 6 for Figure 4 An enlarged view of a local VI in the figure. Figure 2 , Figure 5 and 6As shown, in this embodiment, the inner wall surface of the enclosure is convexly provided with a step portion 150, and the step portion 150 abuts against the upper surface of the bottom plate 110. Specifically, the inner wall surfaces of the first side beam 120 and the second side beam 130 are both provided with a step portion 150, and the step portion 150 is strip-shaped and the extension direction is parallel to the bottom plate 110. By providing the step portion 150, the relative position between the enclosure and the bottom plate 110 can be better defined, thereby facilitating processing. Optionally, the step portion 150 is a hollow structure, and the step portion 150 is disconnected at the partition 140 to avoid the partition 140. Further, in this embodiment, the lower end surface of the enclosure is flush with the lower surface of the bottom plate 110.

[0052] Furthermore, in this embodiment, in order to enhance the heat dissipation effect of the battery cell module 200, a liquid cooling channel (not shown in the figure) for the flow of coolant is provided in the bottom plate 110. To this end, the bottom plate 110 can be made of a material with good thermal conductivity, such as metal aluminum, copper, stainless steel, aluminum alloy, etc. In this embodiment, the liquid cooling function is integrated into the bottom plate 110, which improves the compactness of the structure; and in other optional embodiments, a liquid cooling plate can also be arranged separately and installed on the inner or outer side of the bottom plate 110. In the case of a separate arrangement of the liquid cooling plate, the liquid cooling plate and the box body can be connected by stir friction welding or bolting.

[0053] In summary, the battery box 100 provided in the embodiment of the present application includes a box body and a partition 140, the box body includes a bottom plate 110 and a surrounding plate arranged on the bottom plate 110, the bottom plate 110 and the surrounding plate together enclose a receiving cavity of the box body, and the bottom plate 110 is used to support the battery cell module 200. The partition 140 is arranged in the receiving cavity to divide the receiving cavity into at least two chambers. The partition 140 has a side surface 141 facing the cavity and a lower end surface 142 facing the bottom plate 110, and the lower end surface 142 is connected to the side surface 141 by a chamfered surface 143. The partition 140 is welded to the bottom plate 110 and the weld is located between the chamfered surface 143 and the bottom plate 110. Since a chamfered surface 143 is provided between the lower end surface 142 and the side surface 141 of the partition 140, when the lower end surface 142 of the partition 140 abuts against the bottom plate 110, a wedge-shaped gap 145 is formed between the chamfered surface 143 and the surface of the bottom plate 110, and the weld formed by welding is located in the wedge-shaped gap 145, so that the weld will not protrude into the space for placing the battery cell module 200, and thus will not interfere with the battery cell module 200. Therefore, when the battery box 100 provided in the embodiment of the present application is used to accommodate the battery cell module 200, the battery cell module 200 can be stably placed in each chamber separated by the partition 140, so that the overall structural stability of the battery pack 010 is good.

[0054] The battery pack 010 provided in the embodiment of the present application includes a battery cell module 200 and the above-mentioned battery box 100. The battery cell module 200 is arranged in the cavity. The battery pack 010 has a compact structure and good stability.

[0055] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery box for accommodating a battery cell module (200), characterized in that: The battery box (100) comprises: A box body, the box body comprising a bottom plate (110) and a surrounding plate arranged on the bottom plate (110), the bottom plate (110) and the surrounding plate together enclosing a receiving cavity of the box body, the bottom plate (110) being used to support the battery cell module (200); and, A partition (140), wherein the partition (140) is arranged in the accommodating cavity to divide the accommodating cavity into at least two chambers, the partition (140) has a side surface (141) facing the chamber and a lower end surface (142) facing the bottom plate (110), the lower end surface (142) and the side surface (141) are connected via a chamfered surface (143), the partition (140) and the bottom plate (110) are welded together, and the weld is located between the chamfered surface (143) and the bottom plate (110).

2. The battery box according to claim 1, characterized in that: The width of the chamfered surface (143) projected on the bottom plate (110) is greater than 5 mm.

3. The battery box according to claim 1, characterized in that: The enclosure comprises two first side beams (120) spaced apart from each other in a first direction (A); the partition (140) extends along the first direction (A) and the two ends of the partition (140) are respectively connected to the two first side beams (120); an avoidance groove (121) is provided on the inner side of the first side beam (120), and the end of the partition (140) is inserted into the avoidance groove (121).

4. The battery box according to claim 3, characterized in that: The first side beam (120) and the partition plate (140) are connected by welding or by fasteners.

5. The battery box according to claim 3, characterized in that: The enclosure also includes second side beams (130) spaced apart from each other in a second direction (B), the first direction (A) is perpendicular to the second direction (B), and the enclosure and the bottom plate (110) together enclose a rectangular accommodating cavity.

6. The battery box according to claim 1, characterized in that: A step portion (150) is convexly provided on the inner wall surface of the enclosure, and the step portion (150) abuts against the upper surface of the bottom plate (110).

7. The battery box according to claim 1, characterized in that: A liquid cooling channel for the flow of cooling liquid is provided in the bottom plate (110).

8. The battery box according to claim 1, characterized in that: The enclosure plate and the base plate (110) are connected by welding or by fasteners.

9. The battery box according to claim 1, characterized in that: The enclosure and / or the partition (140) is a hollow structure, and reinforcing ribs (144) are arranged inside the enclosure and / or the partition (140).

10. A battery pack, characterized in that: The invention comprises a battery cell module (200) and a battery box (100) according to any one of claims 1 to 9, wherein the battery cell module (200) is arranged in the chamber.

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