Lower box body of energy storage device and energy storage device

Abstract

The utility model belongs to the technical field of energy storage devices, and discloses a lower box body of an energy storage device and the energy storage device. The energy storage device lower box body comprises a uniform temperature plate, a liquid cooling pipe and a protective bottom plate, and the top surface of the uniform temperature plate is used for abutting against the battery module; the liquid cooling pipe abuts against the lower portion of the uniform temperature plate. The protective bottom plate is located below the uniform temperature plate and the liquid cooling pipe, the protective bottom plate comprises a connecting part and an isolating part, the connecting part is connected to the uniform temperature plate, the isolating part is downwards arranged on the connecting part in a protruding mode, a containing groove capable of containing the liquid cooling pipe is formed above the isolating part, and the isolating part and the liquid cooling pipe are arranged in a spaced mode. The liquid cooling pipe is arranged in the accommodating groove, and the interval between the inner wall of the accommodating groove and the liquid cooling pipe can form a buffer space, so that when the protective bottom plate is deformed due to the impact such as extrusion or collision, the buffer space can accommodate the deformation of the protective bottom plate, and the extrusion on the liquid cooling pipe and the battery module is reduced; and the safety of the liquid cooling pipe and the battery module is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, in particular to a lower box body of an energy storage device and an energy storage device. Background Art

[0002] With the continuous development of the energy storage industry, energy storage device technology, led by lithium-ion batteries, is increasingly being used in energy storage systems. In the actual working process of the energy storage device, the energy storage device needs to be placed in an energy storage box to improve the protection of the energy storage device. The lower box of the energy storage device is used to accommodate the energy storage device and dissipate heat for the energy storage device. In order to improve the ability of the energy storage device to cope with various working conditions, the structural strength of the energy storage device must be improved, and the design method of the energy storage device structure directly affects the overall safety performance of the energy storage device. With the focus on safety performance and energy, the safety performance of the device has become increasingly important; with the development of new processes and technologies, the device structure has also become diverse.

[0003] The energy storage device may fall during use. When the energy storage device falls, the impact force will be transmitted to the battery module through the box, causing the battery module to be subjected to a large impact force, which will lead to failure of the battery module. The lower box of the existing energy storage device has poor anti-extrusion and anti-impact performance. When subjected to impact such as extrusion or collision, the lower box is easily deformed and easily squeezes the battery module arranged above the lower box, which will damage the battery module and bring certain safety hazards.

[0004] Therefore, there is an urgent need for a lower box of an energy storage device and an energy storage device to solve the above problems. Utility Model Content

[0005] One purpose of the utility model is to provide a lower box of an energy storage device, which has higher safety performance and can better protect the safety of a battery module when it is squeezed or impacted.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Provided is a lower box of an energy storage device, comprising:

[0008] A temperature averaging plate, the top surface of which is used to abut against the battery module;

[0009] A liquid cooling pipe, the liquid cooling pipe abuts against the bottom of the temperature averaging plate;

[0010] A protective bottom plate, the protective bottom plate is located below the temperature equalizing plate and the liquid cooling tube, the protective bottom plate includes a connecting portion and an isolating portion, the connecting portion is connected to the temperature equalizing plate, the isolating portion protrudes downward from the connecting portion, a receiving groove capable of receiving the liquid cooling tube is formed above the isolating portion, and the isolating portion is spaced apart from the liquid cooling tube.

[0011] As an optional solution for the lower box of the energy storage device, the liquid cooling tube includes a plurality of bending portions.

[0012] As an optional solution for the lower box of the energy storage device, the shape of the isolation portion matches the shape of the liquid cooling tube.

[0013] As an optional solution for the lower box of the energy storage device, the lower box of the energy storage device further includes a heat insulation plate, and the heat insulation plate is connected between the temperature balancing plate and the connecting portion.

[0014] As an optional solution for the lower box of the energy storage device, the protective bottom plate further includes reinforcing ribs connected between the bottom surface of the connecting portion and the side wall of the isolation portion.

[0015] As an optional solution for the lower box of the energy storage device, the protective bottom plate also includes a first buffer portion, and the first buffer portion is connected below the isolation portion.

[0016] As an optional solution for the lower box of the energy storage device, the protective bottom plate also includes a second buffer portion, and the second buffer portion is connected to the inner wall of the accommodating groove.

[0017] As an optional solution for the lower box of the energy storage device, the protective bottom plate is an integrated structure.

[0018] Another object of the present invention is to provide an energy storage device with higher anti-extrusion and anti-impact performance, thereby improving the safety of the energy storage device.

[0019] To achieve this purpose, the utility model adopts the following technical solutions:

[0020] The energy storage device comprises a battery module and the lower box of the energy storage device, wherein the battery module is in contact with the upper part of the temperature averaging plate.

[0021] As an optional solution for the energy storage device, the energy storage device further includes an upper box body, the battery module is arranged in the upper box body, and the protective bottom plate is connected to the bottom of the upper box body.

[0022] Beneficial effects of the utility model:

[0023] The utility model provides a lower box of an energy storage device, wherein a temperature averaging plate abuts against the bottom of a battery module, and a liquid cooling tube abuts against the bottom of the temperature averaging plate. The temperature averaging plate absorbs the heat generated by the battery module and can evenly diffuse it to the liquid cooling tube, and the coolant in the liquid cooling tube is used to cool down the temperature, thereby ensuring that the heat generated by the battery module is better dissipated. The liquid cooling tube is arranged in a receiving groove, and the interval between the inner wall of the receiving groove and the liquid cooling tube can form a buffer space. When the lower box of the energy storage device is deformed due to impact such as extrusion or collision, the buffer space can accommodate the deformation of the protective bottom plate, thereby reducing the extrusion of the liquid cooling tube and the battery module, and ensuring the safety of the battery module.

[0024] The utility model also provides an energy storage device, which improves the anti-extrusion and anti-impact performance and can better protect the safety of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an exploded view of the lower box of the energy storage device provided by the utility model;

[0026] Figure 2 It is a structural schematic diagram of the protective bottom plate of the lower box of the energy storage device provided by the utility model;

[0027] Figure 3 It is a partial structural schematic diagram of the energy storage device provided by the utility model.

[0028] In the figure:

[0029] 1. Temperature balancing board;

[0030] 2. Liquid cooling tube;

[0031] 3. Protective bottom plate; 31. Connecting part; 32. Isolating part; 33. Accommodating groove; 34. Reinforcing rib; 35. First buffer part; 36. Second buffer part;

[0032] 4. Isolation board;

[0033] 100. Upper box. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] like Figures 1 to 3 As shown, the lower box of the energy storage device of this embodiment includes a temperature equalizing plate 1, a liquid cooling tube 2 and a protective bottom plate 3. The top surface of the temperature equalizing plate 1 is used to abut the battery module (not shown in the figure). The liquid cooling tube 2 abuts against the bottom of the temperature equalizing plate 1. The protective bottom plate 3 is located below the temperature equalizing plate 1 and the liquid cooling tube 2. The protective bottom plate 3 includes a connecting portion 31 and an isolating portion 32. The connecting portion 31 is connected to the temperature equalizing plate 1, and the isolating portion 32 protrudes downward from the connecting portion 31. A receiving groove 33 capable of accommodating the liquid cooling tube 2 is formed above the isolating portion 32, and the isolating portion 32 is spaced apart from the liquid cooling tube 2.

[0039] Based on the above design, the lower box of the energy storage device provided in this embodiment uses the temperature equalizing plate 1 to abut against the bottom of the battery module, and the liquid cooling tube 2 abuts against the bottom of the temperature equalizing plate. The temperature equalizing plate 1 absorbs the heat generated by the battery module and can be evenly diffused to the liquid cooling tube 2. The coolant in the liquid cooling tube 2 is used to cool down, so that the heat generated by the battery module during operation can be better dissipated. The protective bottom plate 3 is connected to the temperature equalizing plate 1 but not in direct contact with the liquid cooling tube 2. The liquid cooling tube 2 is arranged in the receiving groove 33 formed by the isolation part 32, and the isolation part 32 and the liquid cooling tube 2 are arranged at intervals to form a buffer space. When the lower box of the energy storage device is deformed due to impact such as extrusion or collision, the buffer space can accommodate the deformation of the lower box, reduce the extrusion and collision of the liquid cooling tube 2, and further reduce the extrusion and collision of the battery module, thereby ensuring the safety of the battery module. In addition, the lower box of the energy storage device has fewer components, simple assembly, high production efficiency, and low total product cost.

[0040] Reference Figure 1 The liquid cooling tube 2 includes a plurality of bending parts, that is, the liquid cooling tube 2 is a liquid cooling bent tube. The liquid cooling tube 2 is formed by using a plurality of bending parts, so that the liquid cooling tube 2 can be produced according to the shape and size of the battery module. Compared with setting the liquid cooling tube 2 as a straight tube, the length of the liquid cooling tube 2 can be increased as much as possible under the condition that the area of ​​the temperature equalizing plate 1 remains unchanged, thereby improving the heat dissipation effect. And the long straight tube can be bent as a whole to form a liquid cooling bent tube through a bending process, and the process means are mature, the manufacturing is simple, and the cost is saved. In some embodiments, the liquid cooling tube 2 can be set to an S-shaped bent tube. In some other embodiments, the liquid cooling tube 2 can also be set to a spiral form or other irregular shapes.

[0041] Preferably, the shape of the isolation portion 32 matches the shape of the liquid cooling tube 2, that is, the shape of the receiving groove 33 is a long curved groove, which is convenient for positioning when installing the protective bottom plate 3, and such a setting can increase the area of ​​the connecting portion 31, thereby increasing the area of ​​the protective bottom plate 3 and the temperature equalizing plate 1 connected to each other, and improving the structural strength of the lower box of the energy storage device. Optionally, the protective bottom plate 3 is an integrated structure, which is formed by integral stamping, and the structure is simple and stable, and the protective bottom plate 3 and the temperature equalizing plate 1 are connected by bolts to avoid the risk of damage when welding the protective bottom plate 3 and the temperature equalizing plate 1.

[0042] Reference Figure 2 The protective bottom plate 3 also includes a reinforcing rib 34, which is connected between the bottom surface of the connecting portion 31 and the side wall of the isolation portion 32, so as to improve the ability of the protective bottom plate 3 to resist extrusion and collision and ensure the structural strength of the protective bottom plate 3.

[0043] Reference Figure 3The protective bottom plate 3 also includes a first buffer portion 35, which is connected to the bottom of the isolation portion 32. When an extrusion collision occurs at the bottom of the protective bottom plate 3, the external object first contacts and squeezes the first buffer portion 35, causing the first buffer portion 35 to deform and absorb part of the external force, thereby reducing the external force on the isolation portion 32, thereby reducing the degree of deformation of the isolation portion 32 after the force is applied, and reducing the deformation probability of the protective bottom plate 3. Of course, the first buffer portion 35 can also be arranged below the connecting portion 31 to expand the area of ​​the first buffer portion 35, thereby providing more comprehensive protection for the protective bottom plate 3.

[0044] Furthermore, the protective bottom plate 3 also includes a second buffer portion 36, which is connected to the inner wall of the receiving groove 33. When the isolation portion 32 is deformed by force, the second buffer portion 36 is preferentially contacted with the liquid cooling tube 2, and the deformation of the second buffer portion 36 is used to absorb part of the external force, thereby reducing the damage to the liquid cooling tube 2 caused by external extrusion and collision. The second buffer portion 36 can be arranged on the bottom wall of the receiving groove 33, or the second buffer portion 36 can be arranged on the side wall of the receiving groove 33, or the second buffer portion 36 can be arranged on both the bottom wall and the side wall of the receiving groove 33.

[0045] Furthermore, the lower box of the energy storage device also includes an insulation plate 4, which is connected between the temperature equalizing plate 1 and the connecting portion 31, isolating the heat conduction between the temperature equalizing plate 1 and the protective bottom plate 3, ensuring that the low temperature transmitted by the liquid cooling tube 2 to the temperature equalizing plate 1 is transmitted to the protective bottom plate 3 as little as possible, thereby playing a role of thermal insulation, and then eliminating the thermal insulation coating between the temperature equalizing plate 1 and the protective bottom plate 3, which greatly reduces costs and can also reduce the risk of condensation.

[0046] When assembling the lower box of the energy storage device, first, the liquid cooling tube 2 is welded to the temperature equalizing plate 1 to form a liquid cooling assembly; secondly, the insulation plate 4 is attached to the upper surface of the protective bottom plate 3; thirdly, the liquid cooling tube 2 is aligned with the receiving groove 33 and the liquid cooling assembly is placed on the insulation plate 4; finally, the liquid cooling assembly is connected and fixed to the insulation plate 4 and the protective bottom plate 3 by bolts to complete the assembly of the lower box of the energy storage device.

[0047] This embodiment further provides an energy storage device, including a battery module and the above-mentioned lower box of the energy storage device, and the battery module is abutted against the upper side of the temperature balancing plate 1.

[0048] When the energy storage device is working, the battery module generates a large amount of heat, which can be transferred to the temperature averaging plate 1, and the heat of the temperature averaging plate 1 is further transferred to the liquid cooling tube 2, and the coolant in the liquid cooling tube 2 absorbs the heat to cool the battery module. In addition, the energy storage device has good anti-extrusion and anti-impact performance, which can better protect the safety of the battery module.

[0049] Furthermore, the energy storage device also includes an upper box body 100, the battery module is arranged in the upper box body 100, and the protective bottom plate 3 is connected to the bottom of the upper box body 100, which can further protect the battery module.

[0050] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A lower box of an energy storage device, characterized in that: include: A temperature averaging plate (1), the top surface of the temperature averaging plate (1) being used for abutting against the battery module; A liquid cooling tube (2), the liquid cooling tube (2) being in contact with the lower side of the temperature balancing plate (1); A protective bottom plate (3), the protective bottom plate (3) is located below the temperature equalizing plate (1) and the liquid cooling tube (2), the protective bottom plate (3) comprises a connecting portion (31) and an isolating portion (32), the connecting portion (31) is connected to the temperature equalizing plate (1), the isolating portion (32) is protruded downward from the connecting portion (31), a receiving groove (33) capable of receiving the liquid cooling tube (2) is formed above the isolating portion (32), and the isolating portion (32) is spaced apart from the liquid cooling tube (2).

2. The lower box of the energy storage device according to claim 1, characterized in that: The liquid cooling tube (2) comprises a plurality of bending portions.

3. The lower box of the energy storage device according to claim 1, characterized in that: The shape of the isolation portion (32) matches the shape of the liquid cooling tube (2).

4. The lower box of the energy storage device according to claim 1, characterized in that: The lower box of the energy storage device further comprises a heat insulation plate (4), wherein the heat insulation plate (4) is connected between the temperature equalizing plate (1) and the connecting portion (31).

5. The lower box of the energy storage device according to claim 1, characterized in that: The protective bottom plate (3) further comprises a reinforcing rib (34), wherein the reinforcing rib (34) is connected between the bottom surface of the connecting portion (31) and the side wall of the isolating portion (32).

6. The lower box of the energy storage device according to claim 1, characterized in that: The protective bottom plate (3) further comprises a first buffer portion (35), wherein the first buffer portion (35) is connected below the isolation portion (32).

7. The lower box of the energy storage device according to claim 1, characterized in that: The protective bottom plate (3) also includes a second buffer portion (36), and the second buffer portion (36) is connected to the inner wall of the accommodating groove (33).

8. The lower box of the energy storage device according to claim 1, characterized in that: The protective bottom plate (3) is an integrated structure.

9. An energy storage device, comprising a battery module, characterized in that: The energy storage device further comprises a lower box of the energy storage device as claimed in any one of claims 1 to 8, and the battery module is abutted against the top of the temperature balancing plate (1).

10. The energy storage device according to claim 9, characterized in that: The energy storage device further comprises an upper box body (100), the battery module is arranged in the upper box body (100), and the protective bottom plate (3) is connected to the bottom of the upper box body (100).

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