Battery box body and battery pack

Abstract

The invention relates to the technical field of electric energy storage, and particularly discloses a battery box and a battery pack, the battery box comprises a bottom box and a plurality of lifting lugs fixedly arranged on the outer surface of the bottom box, and each lifting lug comprises a welding part welded and fixed to the bottom box and a lifting part fixedly connected to the top of the welding part; wherein a reinforcing groove is formed in the connecting position of the welding part and the hoisting part. According to the battery box body and the battery pack provided by the invention, the problem that the structural strength of the connecting position of the welding part and the hoisting part is relatively low can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy storage, and in particular to a battery box and a battery pack. Background Art

[0002] The battery box body comprises a bottom box for accommodating the battery module and a plurality of hanging ears fixed on the outer surface of the bottom box.

[0003] The existing lifting lug is usually punched into an L-shaped structure from a complete plate, which specifically includes a welding portion for welding and fixing to the side position of the bottom box, and a hanging portion fixed on the top of the welding portion and provided with a hanging hole.

[0004] In actual use, it is found that the simple L-shaped structure has a weak ability to withstand torque, as shown in the following:

[0005] The structural strength of the bending part of the lifting ear (i.e., the connection position between the welding part and the lifting part) is not high. After lifting, under the action of gravity of the bottom box and the battery module, the bending angle of the bending part will increase (i.e., the angle between the welding part and the lifting part will change from a 90° right angle to an obtuse angle). If this continues for a long time, the battery pack will be at a high risk of falling.

[0006] Therefore, it is necessary to improve the existing lifting lugs to solve the problem of low structural strength at the connection position between the welding part and the lifting part.

[0007] The above information disclosed in this Background section is included only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is currently known to a person of ordinary skill in the art. Summary of the invention

[0008] An object of the present invention is to provide a battery box and a battery pack that can effectively solve the problem of low structural strength at the connection position between the welding part and the lifting part.

[0009] To achieve the above objectives, the present invention provides a bottom box and a plurality of lifting ears fixed on the outer surface of the bottom box.

[0010] The lifting lug includes a welding portion welded and fixed to the bottom box, and a lifting portion fixed to the top of the welding portion;

[0011] Wherein, a reinforcement groove is provided at the connection position between the welding portion and the hoisting portion.

[0012] Optionally, the reinforcement groove of at least one of the lifting ears extends from top to bottom, and a drainage hole is provided at the lower end of the reinforcement groove.

[0013] Optionally, the bottom box includes two side surfaces arranged opposite to each other, one end of the two side surfaces is connected by a front end surface, and the other end of the two side surfaces is connected by a rear end surface, and the front end surface, the rear end surface, and the two side surfaces surround and form a battery compartment;

[0014] The position of the battery compartment close to the rear end surface is used to place the battery module, and the position of the battery compartment close to the front end surface is used to place the circuit device; wherein the weight of the battery module is greater than the weight of the circuit device;

[0015] Each of the lifting ears includes a front end lifting ear fixed on the front end surface, a side front lifting ear fixed on the side surface close to the front end surface, and a side rear lifting ear fixed on the side surface close to the rear end surface; wherein the side front lifting ear and the side rear lifting ear are both arranged corresponding to the top angle position of the battery module.

[0016] Optionally, the welding area between the side front lifting ear and the bottom box is larger than the welding area between the front end lifting ear and the bottom box;

[0017] The welding area between the side rear lifting ear and the bottom box is larger than the welding area between the front end lifting ear and the bottom box.

[0018] Optionally, the welding portion of the side front lifting ear includes a first extension portion extending to the bottom surface of the bottom box.

[0019] Optionally, the welding portion of the side rear lifting ear includes a second extension portion extending to the bottom surface of the bottom box and a third extension portion extending to the rear end surface of the bottom box.

[0020] Optionally, a lifting ear reinforcement sheet is fixedly provided on a side of the welding portion and the lifting portion away from the bottom box.

[0021] Optionally, the hoisting portion is provided with a hoisting hole.

[0022] Optionally, it also includes a top cover located above the bottom box to seal the bottom box.

[0023] On the other hand, a battery pack is provided, comprising any of the above-mentioned battery cases, and a battery module and a circuit device located in the battery case.

[0024] The beneficial effects of the present invention are: providing a battery case and a battery pack, wherein a reinforcing groove is arranged at the connection position between the welding part and the lifting part. The design of the reinforcing groove is equivalent to adding a reinforcing rib or a supporting structure at the connection position between the welding part and the lifting part of the lifting ear, which can effectively disperse and withstand the stress generated during lifting, reduce stress concentration, and thus improve the structural strength of the entire lifting ear, so as to solve the problem of low structural strength at the connection position between the welding part and the lifting part in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A schematic diagram of the structure of the top cover provided in the embodiment;

[0027] Figure 2 A schematic top view of a battery box provided in an embodiment;

[0028] Figure 3 A schematic diagram of the structure of the front end lifting lug provided;

[0029] Figure 4 A schematic diagram of the structure of the side front lifting lug is provided;

[0030] Figure 5 A schematic diagram of the structure of the side rear lifting ear is provided.

[0031] In the figure:

[0032] 1. Bottom box; 101. Battery compartment;

[0033] 2a, front end lifting ear; 2b, side front lifting ear; 2c, side rear lifting ear; 201, lifting ear reinforcement plate; 202, welding part; 2021, first extension part; 2022, second extension part; 2023, third extension part; 203, lifting part; 2031, lifting hole; 204, reinforcement groove; 205, drainage hole;

[0034] 3. Battery module. DETAILED DESCRIPTION

[0035] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0036] In the description of the present invention, it is to be understood that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally disposed component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally disposed component.

[0037] In addition, terms such as "long", "short", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device or component referred to must have this specific direction or operate with a specific direction structure, and should not be understood as a limitation of the present invention.

[0038] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0039] The present invention provides a battery box and a battery pack, which are suitable for application scenarios of storing electric energy, and can effectively solve the problem of low structural strength at the connection position between a welding part and a lifting part in the prior art.

[0040] The battery pack provided in this embodiment includes a battery case, and a battery module and a circuit device located in the battery case.

[0041] Optionally, the circuit device includes a BMS and / or a BDU (full name: Battery energy Distribution Unit, which refers to a battery energy distribution unit and is an important component in a high-voltage circuit of an electric vehicle).

[0042] See also Figure 1 and Figure 2 The battery box body includes a bottom box 1, a top cover located above the bottom box 1 to cover the bottom box 1, and a plurality of hanging ears fixed on the outer surface of the bottom box 1.

[0043] The lifting lugs include a welding portion 202 welded to the circumferential surface of the bottom box 1, and a lifting portion 203 fixed to the top of the welding portion 202; wherein a reinforcing groove 204 is provided at the connection position between the welding portion 202 and the lifting portion 203. Furthermore, each of the lifting portions 203 is provided with a lifting hole 2031 for lifting.

[0044] The battery case and battery pack provided in this embodiment are provided with a reinforcing groove 204 at the connection position between the welding part 202 and the lifting part 203. The design of the reinforcing groove 204 is equivalent to adding a reinforcing rib or supporting structure at the connection position between the welding part 202 and the lifting part 203 of the lifting ear, which can effectively disperse and withstand the stress generated during lifting, reduce stress concentration, and thus improve the structural strength of the entire lifting ear. Therefore, it can solve the problem of low structural strength at the connection position between the welding part 202 and the lifting part 203 in the prior art.

[0045] In this embodiment, the bottom box 1 includes two side surfaces arranged opposite to each other, one end of the two side surfaces is connected by a front end surface, and the other end of the two side surfaces is connected by a rear end surface, and the front end surface, the rear end surface, and the two side surfaces surround and form a battery compartment 101;

[0046] The position of the battery compartment 101 close to the rear end surface is a heavy-load area for placing the battery module 3, and the position of the battery compartment 101 close to the front end surface is a light-load area for placing circuit components;

[0047] Each of the ears includes a front end ear 2a fixed on the front end surface, a side front ear 2b fixed on the side surface close to the front end surface, and a side rear ear 2c fixed on the side surface close to the rear end surface; wherein the side front ear 2b and the side rear ear 2c are both arranged corresponding to the top angle position of the battery module 3.

[0048] In this embodiment, the weight of the battery module 3 is greater than the weight of the circuit device. It can be understood that, in general, the weight of the battery module 3 is much greater than that of the circuit device (such as BMS and BDU). Therefore, in this embodiment, the side front lifting ear 2b and the side rear lifting ear 2c are both set at the top corner position of the battery module 3. Such a selection of the lifting ear position ensures that the side front lifting ear 2b and the side rear lifting ear 2c can directly support the heaviest part of the battery pack, effectively distribute the weight, and reduce the additional stress caused by uneven weight distribution. At the same time, this layout minimizes the moment arm of the side front lifting ear 2b and the side rear lifting ear 2c when bearing weight, thereby reducing the bending stress borne by the side front lifting ear 2b and the side rear lifting ear 2c, and improving the structural stability of the battery box. In general, this design minimizes the stress between the bottom box 1 and each lifting ear, thereby improving the overall strength of the battery box.

[0049] In this embodiment, see Figure 3 and Figure 4 The reinforcement grooves 204 of the front end lifting ear 2a and the side front lifting ear 2b extend from top to bottom, and the lower ends of the reinforcement grooves 204 of the two are provided with drainage holes 205. The reinforcement grooves 204 of the front end lifting ear 2a and the side front lifting ear 2b can not only strengthen the structural strength of the lifting ear, but also drain the accumulated liquid to prevent the lifting ear from being corroded and damaged due to the accumulated liquid.

[0050] In some other embodiments, a drainage hole 205 may also be provided at the lower end of the reinforcement groove 204 of the side rear lifting ear 2c, and the present invention is not limited to this.

[0051] In this embodiment, the welding area between the side front lug 2b and the bottom box 1 is larger than the welding area between the front end lug 2a and the bottom box 1; the welding area between the side rear lug 2c and the bottom box 1 is larger than the welding area between the front end lug 2a and the bottom box 1.

[0052] It can be understood that the front end ear 2a mainly bears the weight of the BMS and BDU, and has a smaller workload; the side front ear 2b and the side rear ear 2c mainly bear the weight of the battery module 3, and have a larger workload. Therefore, the dimensions (including height and / or width) of the side front ear 2b and the side rear ear 2c can be set to be larger than the dimensions of the front end ear 2a, so that the weldable area between the side front ear 2b and the side rear ear 2c and the bottom box 1 can be increased, thereby improving the connection strength between the side front ear 2b and the side rear ear 2c and the bottom box 1.

[0053] Optional, see Figure 4 The welding portion 202 of the side front lifting ear 2b includes a first extension portion 2021 extending to the bottom surface of the bottom box 1 to increase the weldable area between the side front lifting ear 2b and the bottom box 1. Figure 5 The welding portion 202 of the side rear lifting ear 2c includes a second extension portion 2022 extending to the bottom surface of the bottom box 1 and a third extension portion 2023 extending to the rear end surface of the bottom box 1, so as to increase the weldable area between the side rear lifting ear 2c and the bottom box 1.

[0054] In this embodiment, the welding portion 202 and the hanging portion 203 are both attached and fixed with a lifting ear reinforcement sheet 201 on one side away from the bottom box 1. Specifically, the welding portion 202 and the hanging portion 203 are combined to form an inner layer lifting ear, and the lifting ear reinforcement sheet 201 is added to the outside of the inner layer lifting ear, so that the lifting ear as a whole presents an inner and outer double-layer structure, further improving the structural strength of the lifting ear.

[0055] In actual production, the ear reinforcement sheet 201 and the inner ear can be first fixedly connected by resistance spot welding, and then the ear can be fixed to the bottom box 1 by spot welding.

[0056] In summary, the battery box and battery pack provided in this embodiment have the following advantages:

[0057] ① Improved structural strength: The design of the reinforced groove 204 is equivalent to adding a reinforcing rib at the key connection position of the lifting ear, which helps to disperse and withstand the stress generated during lifting, reduce stress concentration, and thus significantly improve the load-bearing capacity of the lifting ear;

[0058] ② Optimization of weight distribution: By setting the front side lifting lug 2b and the rear side lifting lug 2c at the top corners of the battery module 3, it is ensured that the lifting lugs directly support the heaviest part of the battery pack, effectively distributing the weight and reducing the additional stress caused by uneven weight distribution;

[0059] ③ Increased welding area: By arranging the extension at a suitable position, the welding area between the side front lifting ear 2b and the side rear lifting ear 2c and the bottom box 1 is larger than the welding area of ​​the front lifting ear 2a, which enhances the connection strength between the lifting ear and the box body and further improves the overall strength of the battery box body;

[0060] ④ Anti-corrosion design: The reinforced groove 204 of the front lifting ear 2a and the side front lifting ear 2b is provided with a drainage hole 205, which not only strengthens the structural strength of the lifting ear, but also can discharge the accumulated liquid to prevent the lifting ear from corrosion and damage due to the accumulated liquid;

[0061] ⑤ Double-layer structure design: The outer sides of the welding part 202 and the lifting part 203 are fixed with a lifting ear reinforcement sheet 201, forming an inner and outer double-layer structure, further improving the structural strength of the lifting ear and enhancing the durability and safety of the battery box.

[0062] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0063] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery box, characterized in that: It comprises a bottom box (1), and a plurality of lifting ears fixedly arranged on the outer surface of the bottom box (1). The lifting lug comprises a welding portion (202) welded and fixed to the bottom box (1), and a lifting portion (203) fixed to the top of the welding portion (202); Wherein, a reinforcement groove (204) is provided at the connection position between the welding portion (202) and the hoisting portion (203).

2. The battery box according to claim 1, characterized in that: The reinforcement groove (204) of at least one of the lifting ears extends from top to bottom, and a drainage hole (205) is provided at the lower end of the reinforcement groove (204).

3. The battery box according to claim 1, characterized in that: The bottom box (1) comprises two side surfaces arranged opposite to each other, one end of the two side surfaces being connected via a front end surface, and the other end of the two side surfaces being connected via a rear end surface, the front end surface, the rear end surface, and the two side surfaces surrounding each other form a battery compartment (101); The position of the battery compartment (101) close to the rear end face is used to place a battery module (3), and the position of the battery compartment (101) close to the front end face is used to place a circuit device; wherein the weight of the battery module (3) is greater than the weight of the circuit device; Each of the lifting ears comprises a front end lifting ear (2a) fixedly arranged on the front end surface, a side front lifting ear (2b) fixedly arranged on the side surface at a position close to the front end surface, and a side rear lifting ear (2c) fixedly arranged on the side surface at a position close to the rear end surface; wherein the side front lifting ear (2b) and the side rear lifting ear (2c) are both arranged corresponding to the top angle position of the battery module (3).

4. The battery box according to claim 3, characterized in that: The welding area between the side front lifting lug (2b) and the bottom box (1) is larger than the welding area between the front end lifting lug (2a) and the bottom box (1); The welding area between the side rear lifting lug (2c) and the bottom box (1) is larger than the welding area between the front end lifting lug (2a) and the bottom box (1).

5. The battery box according to claim 4, characterized in that: The welding portion (202) of the side front lifting ear (2b) comprises a first extension portion (2021) extending to the bottom surface of the bottom box (1).

6. The battery case according to claim 4, characterized in that: The welding portion (202) of the side rear lifting ear (2c) comprises a second extension portion (2022) extending to the bottom surface of the bottom box (1) and a third extension portion (2023) extending to the rear end surface of the bottom box (1).

7. The battery box according to claim 1, characterized in that: A lifting ear reinforcement sheet (201) is fitted and fixedly provided on the side of the welding portion (202) and the lifting portion (203) away from the bottom box (1).

8. The battery box according to claim 1, characterized in that: The hoisting portion (203) is provided with a hoisting hole (2031).

9. The battery box according to claim 1, characterized in that: It also includes a top cover located above the bottom box (1) to cover the bottom box (1).

10. A battery pack, characterized in that: It comprises a battery box as claimed in any one of claims 1 to 9, and a battery module (3) and a circuit device located in the battery box.

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