Low-voltage battery module structure

Abstract

The utility model relates to a low-voltage battery module structure, which belongs to the technical field of low-voltage lithium batteries and comprises a battery cell, a buffer pad and an adhesive tape, the battery core is generally a single lithium battery, and the buffer pad is made of flame-retardant foam or a high-temperature-resistant insulating material and can effectively prevent thermal runaway from spreading and reduce the expansion force of the lithium battery at the end of the service life; the adhesive tape is a high-strength and high-toughness adhesive tape. The plurality of battery cells are stacked in parallel, the battery cells are isolated by using buffer pads to form a module, and the outer side of the module is wound with an adhesive tape for fixing. The problems that an existing low-voltage lithium battery module is complex in assembly, high in cost, large in weight and ineffective in expansion are mainly solved. The lithium battery module has the characteristics of simple module structure, low cost and simple production process, a certain pre-tightening force is applied to the lithium battery module at the initial stage of the service life of the lithium battery module, and the buffer pad is compressed and absorbs the expansive force at the last stage of the service life, so that the service life of a lithium battery system is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of module assembly, in particular to a low-voltage battery module structure. Background Art

[0002] Lithium-ion power batteries have been widely used in the field of new energy pure electric vehicles and hybrid new energy vehicles. With the maturity of technology, the existing low-voltage lithium battery module is composed of end plates, side plates and fastener connection structures. In the face of the problems of complex assembly, high cost, heavy weight and expansion failure of the existing low-voltage lithium battery module, the simplification of the module processing process has put forward higher requirements on the life and cost of low-voltage lithium batteries. Summary of the invention

[0003] The purpose of the invention of the utility model is to overcome the above-mentioned deficiencies of the prior art and to provide a low-voltage battery module structure, which has the characteristics of simple module structure, low cost and simple production process.

[0004] The technical solution of the utility model is: a low-voltage battery module structure, characterized in that: it includes a battery cell, a buffer pad, and an adhesive tape; a plurality of battery cells are stacked in parallel, and the buffer pad is used to isolate two adjacent battery cells to form a module, and the outer side of the module is fixed with an adhesive tape.

[0005] The carrier is located on the upper part of the module.

[0006] Aluminum bars are integrated on the carrier, and the aluminum bars are connected to the battery cell poles by laser welding.

[0007] The number of turns of the tape is 1 to 20; the tape is a wider tape wound in the middle of the outer side of the module, or multiple thinner tapes are evenly arranged up and down; the tape has a thickness of 0.1 to 2 mm and a width of 5 to 300 mm.

[0008] The buffer pad is made of insulating flame-retardant material, has a thickness of 0.2-5 mm, and has a length and width that are adapted to the size of the battery cell.

[0009] The buffer pad is a foam pad, an aerogel pad or a fire blanket.

[0010] The lower part of the module is generally connected and fixed to the box body by structural adhesive.

[0011] The module structure of the utility model mainly solves the problems of complex assembly, high cost, heavy weight and expansion failure of existing low-voltage lithium battery modules. The module structure of the utility model gives it a certain preload at the beginning of its life, and the buffer pad compresses and absorbs its expansion force at the end of its life, thereby greatly improving the system life of the lithium battery module structure (i.e., module structure). The module structure of the utility model removes the traditional module end plate, side plate and fastener connection structure, has a simple structure, reduces processing steps, reduces production equipment investment, and is easier to realize automation and large-scale production, thereby greatly reducing product cost and weight.

[0012] The utility model proposes a solution of setting a buffer pad between the wrapped tape and the battery cell, which ensures that the module has a certain initial preload force and can absorb the expansion force generated by the battery cell at the end of its life, thereby ensuring that the lithium battery system can operate in a relatively ideal preload force range throughout its life cycle, thereby greatly improving the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments 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 creative work.

[0014] Figure 1 It is a structural schematic diagram of the low-voltage battery module structure of the utility model;

[0015] Figure 2 This is an explosion diagram of the low-voltage battery module of the utility model;

[0016] Figure 3 It is an assembly schematic diagram of the low-voltage battery module of the utility model. DETAILED DESCRIPTION

[0017] The technical solution of the utility model will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] Figure 1-3In the present invention, the module structure 7 includes a battery cell 71, a buffer pad 72, a tape 73, and a carrier (CCS) 74; the battery cell 71 is generally a lithium battery cell, and the buffer pad 72 is a flame-retardant foam or a high-temperature resistant insulating material, which can effectively prevent the spread of thermal runaway and reduce the expansion force of the lithium battery at the end of its life. Multiple battery cells 71 are stacked in parallel, and the battery cells 71 are isolated by buffer pads 72 to form a module, and the outside of the module is fixed with tape. The carrier 74 is integrated with aluminum bars, temperature acquisition, voltage acquisition and other components. The aluminum bar is welded to the module battery cell pole to form a battery system. The aluminum bar integrated on the carrier 74 can be used as the positive and negative electrode interface for the module current output and input, and the temperature acquisition and voltage acquisition components are integrated thereon, which can perform temperature and voltage signal acquisition and transmission.

[0019] The battery cell 71 is generally a square shell lithium battery cell, and the number of module battery cells can be 1 to 20. The buffer pad 72 is an insulating flame-retardant material with a certain compressibility under the action of external force, such as foam, aerogel pad, fire blanket, etc., with a thickness of 0.2 to 5 mm, and a length and width adapted to the size of the battery cell. The tape 73 is a high-strength, high-toughness tape with a thickness of 0.1 to 2 mm, a width of 5 to 300 mm, and a number of windings of 1 circle. The module is wrapped with tape under external pressure, the external force is 5 to 3000 N, and the initial preload force that the module can obtain is 1 to 2500 N. The number of wrapped tapes 73 can be a wider one wrapped in the middle of the outer side of the module, or multiple tapes can be evenly arranged up and down to ensure uniform module preload. The lower part of the module is generally connected and fixed to the box 76 by a high-strength structural adhesive 75.

[0020] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. 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 low-voltage battery module structure, characterized in that: It comprises a battery cell (71), a buffer pad (72), and an adhesive tape (73); a plurality of battery cells (71) are stacked in parallel, and the buffer pad (72) is used to isolate two adjacent battery cells (71) to form a module, and the adhesive tape (73) is wound around the outside of the module for fixing.

2. The low-voltage battery module structure according to claim 1, characterized in that: The carrier (74) is located at the upper part of the module.

3. The low-voltage battery module structure according to claim 2, characterized in that: An aluminum bar is integrated on the carrier (74), and the aluminum bar is connected to the pole of the battery cell (71) by laser welding.

4. The low-voltage battery module structure according to claim 1, characterized in that: The number of turns of the adhesive tape (73) is 1 to 20; the adhesive tape (73) is a piece of adhesive tape wound in the middle of the outer side of the module, or a plurality of adhesive tapes are evenly arranged up and down; the adhesive tape (73) has a thickness of 0.1 to 2 mm and a width of 5 to 300 mm.

5. The low-voltage battery module structure according to claim 1, characterized in that: The buffer pad (72) is made of insulating flame-retardant material, the buffer pad (72) has a thickness of 0.2-5 mm, and the length and width of the buffer pad (72) are adapted to the size of the battery cell (71).

6. The low-voltage battery module structure according to claim 1, characterized in that: The buffer pad (72) is a foam pad, an aerogel pad or a fire blanket.

7. The low-voltage battery module structure according to claim 1, characterized in that: The lower part of the module is connected and fixed to the box body (76) by means of structural adhesive (75).

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