Lower shell structure of energy storage battery

Abstract

A lower shell structure of an energy storage battery is characterized in that the lower shell structure comprises a disc-shaped shell and a metal heat conduction plate, the disc-shaped shell is an integrally-formed injection molding part composed of a bottom plate and a surrounding plate, and a flow guide groove is formed in the upper surface of the bottom plate in a concave mode so that protruding connecting ribs can be formed in the positions, on the two sides of the flow guide groove, of the upper surface of the bottom plate; the metal heat-conducting plate covers the bottom plate in a sealing mode, welding plastic strips are arranged at the positions, corresponding to the connecting ribs of the bottom plate, of the metal heat-conducting plate in an integrated injection molding mode, and seen from the cross section of the welding plastic strips, the upper ends of the welding plastic strips are connected with the metal heat-conducting plate in an integrated injection molding mode, and the lower ends of the welding plastic strips are connected with the connecting ribs in a welded mode to form a welding part. The metal heat conduction plate seals the flow guide groove to form a cooling flow channel, and a cooling liquid inlet and a cooling liquid outlet are led out of the cooling flow channel.

Description

Technical Field

[0001] The utility model relates to a shell (or box) of an energy storage battery. Background Art

[0002] Energy storage batteries mainly refer to batteries used in solar power generation equipment, wind power generation equipment and renewable energy storage. During use, they will undergo certain charging and discharging behaviors, which will be accompanied by battery heating. In order to ensure the comprehensive performance and service life of the battery, the heat generated by the battery needs to be dissipated in time.

[0003] In the prior art, a liquid cooling plate is used as a bottom plate on which an upper box body is buckled to form a shell structure for accommodating batteries. The liquid cooling plate is an independent component made of metal (usually aluminum alloy) with an internal flow channel. It has a complex structure and its material cost and production cost are both high. Summary of the invention

[0004] The invention object of the utility model is to provide a lower shell structure of an energy storage battery, which reduces the manufacturing cost on the basis of ensuring a certain heat dissipation performance so as to be suitable for mass production.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a lower shell structure of an energy storage battery, comprising a disc-shaped shell and a metal heat-conducting plate, the disc-shaped shell is an integrally formed injection-molded part consisting of a bottom plate and a surrounding plate, the upper surface of the bottom plate is concavely provided with a guide groove, so that the upper surface of the bottom plate forms raised connecting ribs at the positions on both sides of the guide groove; the metal heat-conducting plate is sealed on the bottom plate, and the metal heat-conducting plate is integrally injection-molded with a welding plastic strip corresponding to the connecting rib of the bottom plate, and from the cross-section of the welding plastic strip, its upper end is integrally injection-molded and connected with the metal heat-conducting plate, and its lower end is welded and connected with the connecting rib to form a welding part, so that the metal heat-conducting plate seals the guide groove to form a cooling channel, and a coolant inlet and a coolant outlet are led out of the cooling channel.

[0006] In the above scheme, the structure of the connecting rib is as follows: viewed from the cross section of the connecting rib, it includes a welding protrusion in the middle and two blocking walls arranged on both sides of the welding protrusion; the welding protrusion is welded and fused with the lower end of the welding plastic strip to form the welding portion, and a limiting accommodating space for the welding portion is formed between the two blocking walls.

[0007] Furthermore, the junction between the metal heat conducting plate and the two sides of the welding plastic strip is bent downward and towards each other to extend into flanges, and the distance between the two flanges is smaller than the upper width of the cross section of the welding plastic strip.

[0008] Furthermore, the width of the upper end of the cross section of the welded plastic strip is 15 mm to 40 mm, and the spacing between the two flanges is 5 mm to 20 mm.

[0009] In the above solution, the welding plastic strip is connected to the metal heat conducting plate by integral injection molding using a secondary encapsulation process.

[0010] The design points of the utility model are:

[0011] The utility model adopts an integral injection molded part for the disc-shaped shell, and integrally forms a guide groove on the disc-shaped shell of the injection molded part. The mass production cost is low. However, in order to improve the heat exchange efficiency, the heat conductive plate in contact with the battery is still a metal heat conductive plate. However, how to reliably seal the metal heat conductive plate with the plastic shell becomes a difficulty. The inventor of this case has made a breakthrough by integrally injection-molding a welding plastic strip on the metal heat conductive plate, so as to achieve reliable welding and sealing between plastics by welding the plastic strip and the injection molded part shell, which not only ensures the heat dissipation performance but also greatly reduces the production cost, and is suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front view full cross-sectional schematic diagram of an embodiment of the utility model;

[0013] Figure 2 for Figure 1 A is an enlarged schematic diagram;

[0014] Figure 3 It is a top view schematic diagram of a disc-shaped housing according to an embodiment of the utility model.

[0015] In the above drawings: 1, disc-shaped shell; 11, bottom plate; 111, guide groove; 112, connecting rib; 1121, welding protrusion; 1122, blocking wall; 1123, limit accommodating space of welding part; 12, enclosure;

[0016] 2. Metal heat conducting plate; 21. Welding plastic strip; 211. Welding part; 22. Flanging.

[0017] 3. Coolant inlet;

[0018] 4. Coolant outlet. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0020] The present invention will be clearly described below with drawings and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0021] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0022] As used herein, “connected” or “positioned” may refer to two or more components or devices being in direct physical contact with each other, or being in indirect physical contact with each other, or may refer to two or more components or devices operating or moving with each other.

[0023] The terms “include,” “including,” “have,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0024] The terms used in this document generally have the ordinary meaning of each term used in this field, in the context of the case and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present invention.

[0025] The terms "front", "back", "upper" and "lower" used in this article are directional terms. In this case, they are only used to illustrate the positional relationship between the structures and are not used to limit the protection plan of this case and the specific direction during actual implementation.

[0026] Embodiment: A lower shell structure of an energy storage battery, see Figures 1 to 3 As shown:

[0027] Energy storage battery lower shell structure, see Figures 1 to 3 , comprising a disc-shaped shell 1 and a metal heat conducting plate 2, the disc-shaped shell 1 is an integrally formed injection molded part consisting of a bottom plate 11 and a surrounding plate 12, the upper surface of the bottom plate 11 is concavely provided with a guide groove 111, so that the upper surface of the bottom plate forms raised connecting ribs 112 at the positions on both sides of the guide groove 111; the metal heat conducting plate 2 is sealed on the bottom plate 11, and the metal heat conducting plate 2 is integrally injection molded with a welding plastic strip 21 corresponding to the connecting rib 112 of the bottom plate 11, and from the cross section of the welding plastic strip 21, its upper end is integrally injection molded and connected with the metal heat conducting plate 2, and its lower end is welded and connected with the connecting rib 112 to form a welding portion 211, so that the metal heat conducting plate 2 seals the guide groove 111 to form a cooling channel, and a coolant inlet 3 and a coolant outlet 4 are led out of the cooling channel.

[0028] See also Figures 1 to 3 The structure of the connecting rib 112 is as follows: Figure 2As shown, it includes a welding protrusion 1121 in the middle and two blocking walls 1122 arranged on both sides of the welding protrusion 1121. The welding protrusion 1121 is welded and fused with the lower end of the welding plastic strip 21 to form the welding portion 211. The welding protrusion 1121 is specially provided for welding, and a limiting accommodating space 1123 of the welding portion is formed between the two blocking walls 1122 to ensure that the molten welding portion during welding will not flow into the guide groove and block the guide groove.

[0029] See also Figure 2 As shown, the junction of the metal heat conducting plate 2 and the two sides of the welding plastic strip 21 is bent downward and toward each other to extend the flanges 22, and the distance between the two flanges 22 is smaller than the upper width of the cross section of the welding plastic strip 21. Specifically, the upper width of the cross section of the welding plastic strip 21 is 15mm to 40mm, and the distance between the two flanges is 5mm to 20mm.

[0030] The welding plastic strip 21 is connected to the metal heat conducting plate 2 by integral injection molding using a secondary injection molding process (also called rubber encapsulation).

[0031] During welding, welding equipment is used to vibrate and frictionally heat the top of the welding plastic strip 21 which is pressed onto the metal heat conducting plate 2, so that the welding plastic strip 21 melts and integrates with the welding protrusion 1121 to form a welding portion 211.

[0032] The mass production of this embodiment has low production cost, simple production process and is easy to implement. When in use, the heat generated by the installed batteries can be efficiently transferred to the coolant in the cooling channel through the metal heat conductive plate, and the coolant takes away the heat, thereby achieving good heat dissipation.

[0033] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A lower shell structure of an energy storage battery, characterized in that: The invention comprises a disc-shaped shell and a metal heat-conducting plate, wherein the disc-shaped shell is an integrally formed injection-molded part consisting of a base plate and a surrounding plate, wherein a guide groove is recessed on the upper surface of the base plate so that raised connecting ribs are formed on the upper surface of the base plate at positions on both sides of the guide groove; the metal heat-conducting plate is sealed on the base plate, and a welding plastic strip is integrally injection-molded on the metal heat-conducting plate corresponding to the connecting rib of the base plate, and from the cross section of the welding plastic strip, its upper end is integrally injection-molded and connected to the metal heat-conducting plate, while its lower end is welded and connected to the connecting rib to form a welding portion, so that the metal heat-conducting plate seals the guide groove to form a cooling channel, and a coolant inlet and a coolant outlet are led out of the cooling channel.

2. The lower shell structure of the energy storage battery according to claim 1, characterized in that: The structure of the connecting rib is as follows: viewed from the cross section of the connecting rib, it includes a welding protrusion in the middle and two blocking walls arranged on both sides of the welding protrusion; the welding protrusion is welded and fused with the lower end of the welding plastic strip to form the welding portion, and a limiting accommodating space for the welding portion is formed between the two blocking walls.

3. The lower shell structure of the energy storage battery according to claim 1 or 2, characterized in that: The junction between the metal heat conducting plate and the two sides of the welding plastic strip is bent downward and towards each other to extend flanges, and the distance between the two flanges is smaller than the upper end width of the cross section of the welding plastic strip.

4. The lower shell structure of the energy storage battery according to claim 3 is characterized in that: The upper end width of the cross section of the welded plastic strip is 15 mm to 40 mm, and the spacing between the two flanges is 5 mm to 20 mm.

5. The lower shell structure of the energy storage battery according to claim 1, characterized in that: The welding plastic strip is connected with the metal heat conducting plate by integral injection molding through a secondary encapsulation process.

Images