Battery shell, battery pack and electric equipment

Abstract

The utility model discloses a battery shell, a battery pack and electric equipment. The battery shell comprises an upper cover and a lower cover, the upper cover is arranged on the bottom plate in a covering manner; the battery module comprises a bottom plate and a cover plate, the side, away from the battery module, of the cover plate is connected with the bottom plate, a containing cavity is formed between the cover plate and the upper cover, the containing cavity is used for arranging the battery module, a liquid cooling cavity is formed between the cover plate and the bottom plate, and a liquid cooling working medium circulates in the liquid cooling cavity. Wherein the liquid cooling cavity for circulating the liquid cooling working medium is formed between the cover plate and the bottom plate, the heat of the battery module is taken away through the circulation of the liquid cooling working medium, the space of the bottom plate in the battery pack is fully utilized, the integration degree is high, and the space utilization rate is higher.

Description

Technical Field

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

[0002] The battery pack system mainly includes a battery pack upper cover, a battery pack bottom plate, the batteries and modules of the battery pack, high and low voltage circuits and a control system, a battery pack liquid cooling system and a heat conduction system, etc. The complete liquid cooling system includes components such as a battery cooler, an electronic expansion valve, an electronic water pump, a battery valve and a liquid cooling plate; among them, the liquid cooling plate realizes the cooling function by the flow of the liquid cooling working medium in the channel to transfer the excess heat, and is a key component of the liquid cooling system.

[0003] The battery generates excess heat during operation, and the heat is transferred by the contact between the battery or the module and the surface of the liquid cooling plate, and finally is taken away by the liquid cooling working medium flowing through the internal flow channel of the liquid cooling plate. The general requirements for the liquid cooling plate are high heat dissipation power, which can timely export the excess heat generated during the operation of the power battery and avoid the occurrence of excessive temperature rise.

[0004] In the liquid cooling solution adopted by the electric vehicle power battery, the liquid cooling plate is installed on the new energy vehicle as a separate part, which will occupy more space, increase the cost, and is not conducive to the development requirements of the lightweight of new energy vehicles. Summary of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, the utility model provides a battery housing, in which a liquid cooling cavity for circulating the liquid cooling working medium is formed between the cover plate and the bottom plate. The heat of the battery module is taken away by the circulation of the liquid cooling working medium, making full use of the space of the bottom plate inside the battery pack, with high integration and higher space utilization rate.

[0006] The utility model further provides a battery pack.

[0007] The utility model further provides an electrical equipment.

[0008] The battery housing according to the first aspect embodiment of the utility model includes: an upper cover; a bottom plate, the upper cover is covered on the bottom plate; a cover plate, the cover plate is connected to the bottom plate to form a receiving cavity between the cover plate and the upper cover, the receiving cavity is used for arranging the battery module, a liquid cooling cavity is formed between the cover plate and the bottom plate, and the liquid cooling working medium circulates in the liquid cooling cavity.

[0009] According to the embodiment of the utility model, a liquid cooling cavity for circulating the liquid cooling working medium is formed between the cover plate and the bottom plate. The heat of the battery module is taken away by the circulation of the liquid cooling working medium, making full use of the space of the bottom plate inside the battery pack, with high integration and higher space utilization rate.

[0010] According to some embodiments of the present utility model, the bottom plate includes: a bottom wall and an annular side wall, the annular side wall is connected to the peripheral side of the bottom wall, the annular side wall is provided with a clamping portion, the clamping portion is annularly arranged on the annular side wall, and the cover plate is clamped with the clamping portion.

[0011] According to some embodiments of the present utility model, the clamping portion is a groove.

[0012] According to some embodiments of the present utility model, a liquid inlet and a liquid outlet are provided on the annular side wall, and the liquid cooling cavity communicates with the liquid inlet and the liquid outlet.

[0013] According to some embodiments of the present utility model, the battery housing further includes: a first sealing member, and the first sealing member is clamped between the cover plate and the clamping portion.

[0014] According to some embodiments of the present utility model, the battery housing further includes: a second sealing member, and the second sealing member is arranged between the first sealing member and the clamping portion.

[0015] According to some embodiments of the present utility model, the battery housing further includes: a first heat conducting layer, and the first heat conducting layer is arranged between the cover plate and the battery module for realizing heat transfer between the battery module and the cover plate.

[0016] According to some embodiments of the present utility model, a plurality of spaced baffles are arranged on the bottom plate, the baffles extend in the height direction, and a plurality of mutually enclosed liquid cooling cavities are formed between the cover plate and the plurality of baffles.

[0017] A battery pack according to an embodiment of the second aspect of the present utility model includes: the battery housing; a battery module, and the battery module is arranged in the accommodating cavity.

[0018] An electrical device according to an embodiment of the third aspect of the present utility model includes: the battery pack.

[0019] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0020] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0021] Figure 1 is a schematic diagram of the overall structure of a battery pack according to an embodiment of the present utility model;

[0022] Figure 2It is a partial schematic diagram of a battery pack according to an embodiment of the present invention.

[0023] Reference numerals:

[0024] 10. Battery pack; 11. Upper cover; 12. Bottom plate; 121. Bottom wall; 122. Annular side wall; 123. Clamping portion; 13. Cover plate; 14. Battery module; 15. First heat-conducting layer; 16. Liquid-cooling cavity; 17. First seal. Detailed implementation manners

[0025] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention will be described in detail below.

[0026] Reference will be made below to Figure 1 - Figure 2 Describe a battery housing according to an embodiment of the present invention, and a battery pack 10 including the above battery housing is also proposed; and, an electrical device including the above battery pack 10 is further proposed.

[0027] Among them, Figure 1 - Figure 2 The up-down direction in

[0028] As Figure 1 shown, the battery housing includes: an upper cover 11, a cover plate 13 and a bottom plate 12. The upper cover 11 is covered on the bottom plate 12, and a receiving cavity is formed between the cover plate 13 and the upper cover 11 for arranging the battery module 14. Specifically, the upper cover 11 is fixedly connected to the bottom plate 12 to form the appearance of the battery pack 10. An installation space is formed between the upper cover 11 and the bottom plate 12, and both the cover plate 13 and the battery module 14 are arranged in the installation space. A receiving cavity is formed between the cover plate 13 and the upper cover 11, and the battery module 14 is arranged in the receiving cavity.

[0029] The upper cover 11 and the bottom plate 12 are connected by means including but not limited to riveting, screws, gluing, riveting + gluing or screws + gluing. In actual use, the connection method is set according to needs and will not be elaborated here one by one.

[0030] As Figure 1 and Figure 2As shown, the cover plate 13 is connected to the bottom plate 12 to form a liquid cooling cavity 16 between the cover plate 13 and the bottom plate 12, and a liquid cooling working medium flows in the liquid cooling cavity 16. Specifically, the cover plate 13 is disposed in the installation space, the cover plate 13 is disposed between the battery module 14 and the bottom plate 12, and one side of the cover plate 13 facing away from the battery module 14 is connected to the bottom plate 12 to form a hollow structure between the cover plate 13 and the bottom plate 12, that is, a liquid cooling cavity 16 is formed between the cover plate 13 and the bottom plate 12, and a liquid cooling working medium can flow in the liquid cooling cavity 16, and the heat of the battery module 14 is carried away by the flow of the liquid cooling working medium. The liquid cooling working medium reciprocally flows in the liquid cooling cavity 16 to achieve the purpose of regulating the temperature of the battery pack 10. Integrating the liquid cooling cavity 16 inside the bottom plate 12 of the battery pack 10 makes the structure more integrated and improves the space utilization rate.

[0031] Furthermore, the bottom plate 12 can be made of a metal material to ensure the strength of the bottom of the battery housing and ensure the structural strength of the liquid cooling cavity 16 formed between the bottom plate 12 and the cover plate 13 through which the liquid cooling working medium flows.

[0032] In the related art, the liquid cooling plate is formed by sealing an upper cooling plate and a lower cooling plate to form a channel for the liquid cooling working medium. In the present utility model, without changing the space and function, the cover plate 13 and the bottom plate 12 are used to replace the separate liquid cooling plate in the prior art, reducing the lower cooling plate, saving the cost of the lower cooling plate, and improving the volume utilization rate of the battery pack 10.

[0033] According to Figure 1 and Figure 2 As shown, the bottom plate 12 includes: a bottom wall 121 and an annular side wall 122, the annular side wall 122 is connected to the peripheral side of the bottom wall 121, the annular side wall 122 is provided with a clamping portion 123, the clamping portion 123 is annularly arranged on the annular side wall 122, and the cover plate 13 is clamped with the clamping portion 123. Specifically, the upper end surface of the annular side wall 122 is fixedly connected to the upper cover 11, and the annular side wall 122 and the upper cover 11 are connected by means including but not limited to riveting, screws, gluing, riveting + gluing or screws + gluing. In actual use, the connection method is set according to needs and will not be elaborated here one by one. The annular side wall 122 is connected to the peripheral side of the bottom wall 121, and the annular side wall 122 is connected to the cover plate 13 to form a sealed liquid cooling cavity 16 between the cover plate 13 and the bottom plate 12.

[0034] Specifically, a clamping portion 123 is provided on the inner side of the annular side wall 122, the clamping portion 123 is annularly arranged around the side wall, and the cover plate 13 is clamped and connected to the clamping portion 123 to fix the cover plate 13 on the inner circumference of the annular side wall 122 to form a liquid cooling cavity 16 through which the liquid cooling working medium flows between the cover plate 13 and the bottom plate 12.

[0035] Further, the clamping portion 123 is a groove. That is to say, the clamping portion 123 can be a groove, which is recessed inward to form an annular groove. The outer peripheral side of the cover plate 13 is clamped with the groove to fix the cover plate 13 on the bottom plate 12, so as to form a liquid cooling cavity 16 for circulating the liquid cooling working medium between the cover plate 13 and the bottom plate 12.

[0036] Further, an inlet and an outlet are provided on the annular side wall 122, and the liquid cooling cavity 16 communicates with the inlet and the outlet. Specifically, the liquid cooling working medium in the liquid cooling cavity 16 enters through the inlet and exits through the outlet, so as to realize the circulating flow of the liquid cooling working medium in the liquid cooling cavity 16.

[0037] In some other embodiments, there can be multiple liquid cooling cavities 16, and the multiple liquid cooling cavities 16 are arranged at intervals and respectively correspond to the positions where multiple battery cells are located to ensure the cooling effect on the battery cells. The inlets can be multiple, and the outlets can be multiple. The multiple inlets and the multiple outlets correspond to each other one by one, and the multiple inlets and the multiple outlets are respectively communicated with the multiple liquid cooling cavities 16.

[0038] As Figure 2 shown, the battery housing further includes: a first seal 17, and the first seal 17 is clamped between the cover plate 13 and the clamping portion 123. Specifically, the outer peripheral side of the first seal 17 is fixedly connected to the clamping portion 123, and the inner peripheral side of the first seal 17 abuts against the cover plate 13. The first seal 17 is arranged between the cover plate 13 and the clamping portion 123. On the basis of the clamping connection between the cover plate 13 and the clamping portion 123, the first seal 17 is further arranged between the cover plate 13 and the clamping portion 123 to ensure the sealing performance between the cover plate 13 and the bottom plate 12.

[0039] Further, the battery housing further includes: a second seal, and the second seal is arranged between the first seal 17 and the cover plate 13. The second seal includes but is not limited to sealant or structural adhesive. On the basis of the first seal 17, sealant or structural adhesive is coated to further improve the sealing performance between the cover plate 13 and the clamping portion 123.

[0040] As Figure 1 and Figure 2 shown, the battery housing further includes: a first heat conduction layer 15, and the first heat conduction layer 15 is arranged between the cover plate 13 and the battery module 14 for realizing heat transfer between the battery module 14 and the cover plate 13. Specifically, the first heat conduction layer 15 is arranged on the side where the cover plate 13 abuts against the battery module 14. The cover plate 13 evenly exchanges the heat of the liquid cooling working medium and the battery module 14 to realize heat exchange, so as to achieve the purpose of controlling the temperature of the battery module 14.

[0041] In some other embodiments, the battery housing further includes: a second heat conducting layer disposed between the battery module 14 and the upper cover 11 for achieving heat transfer between the battery module 14 and the upper cover 11, so that part of the heat of the battery module 14 is dissipated to the outside through the upper cover 11, improving the heat dissipation efficiency of the battery module 14.

[0042] In some embodiments, a plurality of spaced baffles are provided on the bottom plate 12. The baffles extend in the height direction. A plurality of mutually enclosed liquid cooling cavities 16 are formed between the cover plate 13 and the plurality of baffles. Specifically, the lower surface of the baffle is fixedly connected to the bottom wall 121. The baffle extends upward in the height direction. When the cover plate 13 is snap-connected to the bottom plate 12, the upper surface of the baffle abuts against the cover plate 13, and a plurality of liquid cooling cavities 16 are formed between the cover plate 13 and the baffle. The plurality of liquid cooling cavities 16 are separated from each other. The plurality of liquid cooling cavities 16 can be communicated with each other or not communicated with each other. Liquid cooling working media flow in the plurality of liquid cooling cavities 16 respectively. The liquid cooling working media and the battery module 14 perform heat pipe exchange through the cover plate 13 to adjust the temperature of the battery module 14.

[0043] In some embodiments, the cover plate 13 and the baffle can be directly adhered together by compaction and riveting, which is equivalent to adding strengthening cross beams to the bottom plate 12, indirectly improving the structural strength of the bottom plate 12 of the battery pack 10.

[0044] The battery pack 10 according to the second aspect embodiment of the present invention includes: a battery housing and a battery module 14. An accommodation cavity is formed between the upper cover 11 and the cover plate 13, and the battery module 14 is disposed in the accommodation cavity. The cover plate 13 and the bottom plate 12 are used to replace the original separate liquid cooling plate, reducing the lower cooling plate, saving the cost of the lower cooling plate, and improving the volume utilization rate of the battery pack 10. With the reduction of components, the integration of the battery pack 10 is improved, reducing the overall component assembly process of the battery pack 10. While the work efficiency is improved, the qualified rate of the product will also be improved.

[0045] The electrical equipment according to the third aspect embodiment of the present invention includes: a battery pack 10. In the present invention, the cover plate 13 and the bottom plate 12 are used to replace the original separate liquid cooling plate, reducing the number of components and also reducing the overall weight of the battery pack 10, indirectly improving the mass energy density of the battery pack 10, which means that the electrical equipment has higher endurance and faster acceleration.

[0046] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0047] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0048] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery housing, characterized in that: include: Upper cover (11); A bottom plate (12), the upper cover (11) being disposed on the bottom plate (12); A cover plate (13), wherein a receiving cavity is formed between the cover plate (13) and the upper cover (11), wherein the receiving cavity is used to arrange a battery module (14), and wherein the cover plate (13) is connected to the bottom plate (12) to form a liquid cooling cavity (16) between the cover plate (13) and the bottom plate (12), wherein the liquid cooling cavity (16) is used to circulate a liquid cooling medium.

2. The battery housing according to claim 1, characterized in that: The bottom plate (12) comprises: a bottom wall (121) and an annular side wall (122); the annular side wall (122) is connected to the peripheral side of the bottom wall (121); the annular side wall (122) is provided with a clamping portion (123); the clamping portion (123) is arranged in an annular shape on the annular side wall (122); and the cover plate (13) is clamped with the clamping portion (123).

3. The battery housing according to claim 2, characterized in that: The clamping portion (123) is a groove.

4. The battery casing according to claim 2, characterized in that: A liquid inlet and a liquid outlet are provided on the annular side wall (122), and the liquid cooling cavity (16) is connected to the liquid inlet and the liquid outlet.

5. The battery casing according to claim 2, characterized in that: Also includes: A first sealing member (17), wherein the first sealing member (17) is sandwiched between the cover plate (13) and the clamping portion (123).

6. The battery casing according to claim 5, characterized in that: Also includes: A second sealing member is arranged between the first sealing member (17) and the clamping portion (123).

7. The battery housing according to claim 1, characterized in that: Also includes: A first heat-conducting layer (15), wherein the first heat-conducting layer (15) is arranged between the cover plate (13) and the battery module (14) and is used to achieve heat transfer between the battery module (14) and the cover plate (13).

8. The battery casing according to claim 1, characterized in that: The bottom plate (12) is provided with a plurality of spaced baffles, the baffles extending in the height direction of the battery housing, and a plurality of mutually enclosed liquid cooling cavities (16) are formed between the cover plate (13) and the plurality of baffles.

9. A battery pack, characterized in that: include: The battery housing according to any one of claims 1 to 8; A battery module (14), wherein the battery module (14) is arranged in the accommodating cavity.

10. An electrical device, characterized in that: include: The battery pack (10) as claimed in claim 9.

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