Battery module structure

Abstract

The utility model provides a battery module structure. The battery module structure comprises a first end plate, a battery cell module, a second end plate and a plurality of steel belts, the first end plate and the second end plate are symmetrically arranged at two ends of the battery cell module, and the first end plate and the second end plate are respectively propped against the battery cell module; one end of each steel belt is fixed on the outer side surface of the first end plate, the other end of each steel belt is fixed on the outer side surface of the second end plate, and the steel belts are arranged on the two sides of the battery cell module; the battery cell module comprises a plurality of battery cell units, and an insulating sheet is arranged between every two adjacent battery cell units; the insulating sheets comprise a first heat-conducting insulating sheet, a heat-insulating flame-retardant sheet and a second heat-conducting insulating sheet, the heat-insulating flame-retardant sheet is arranged between the first heat-conducting insulating sheet and the second heat-conducting insulating sheet, and the first heat-conducting insulating sheet and the second heat-conducting insulating sheet are respectively propped against the adjacent battery cell units. The cable is simple in structure and has good heat-conducting, insulating, heat-insulating and flame-retardant effects.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery module structure. Background Art

[0002] At present, the global energy structure is still dominated by fossil energy, and the environmental safety problems it causes are becoming increasingly serious; the development and utilization of renewable energy is an effective way to solve energy problems, and energy control is the core means of renewable energy development. Lithium-ion batteries are an effective energy storage method to solve the problem of energy control at this stage. Lithium-ion batteries have the advantages of long life, large specific capacity and no memory effect, and are widely used in new energy vehicles, drones, power tools, communication energy storage and other fields.

[0003] The battery pack module generally includes multiple battery cells. During the operation of the module, the battery cells will generate heat. If the generated heat cannot be discharged in time, it is easy to cause heat accumulation and thermal runaway accidents. Moreover, when a battery cell has thermal runaway, the thermal runaway battery cell will quickly transfer the high temperature to the adjacent battery cells, causing the thermal runaway of the battery cells to spread, which poses a great safety hazard. Utility Model Content

[0004] The present invention provides a battery module structure, aiming to solve the problems that the existing battery module is difficult to ensure the heat dissipation of the battery cell unit surface and the insulation between the battery cell units, the thermal runaway of the battery cell units is prone to spread, and there are great safety hazards.

[0005] To achieve the above-mentioned purpose, the embodiment of the utility model provides a battery module structure, comprising a first end plate, a battery cell module, a second end plate and a plurality of steel strips; the first end plate and the second end plate are symmetrically arranged at the two ends of the battery cell module, and the first end plate and the second end plate are respectively abutted against the battery cell module; one end of the steel strip is fixed to the outer surface of the first end plate, and the other end is fixed to the outer surface of the second end plate, and the steel strip is arranged on both sides of the battery cell module;

[0006] The battery cell module includes a plurality of battery cell units, and an insulating sheet is arranged between adjacent battery cell units; the insulating sheet includes a first thermally conductive insulating sheet, a thermally insulating and flame-retardant sheet, and a second thermally conductive insulating sheet, and the thermally insulating and flame-retardant sheet is arranged between the first thermally conductive insulating sheet and the second thermally conductive insulating sheet, and the first thermally conductive insulating sheet and the second thermally conductive insulating sheet are respectively abutted against the adjacent battery cell units.

[0007] As a preferred embodiment, the first thermally conductive insulating sheet and the second thermally conductive insulating sheet are respectively abutted and connected to the thermally insulating and flame-retardant sheet.

[0008] As a preferred embodiment, the area of ​​the side surface of the insulating sheet close to the battery cell unit is less than or equal to the area of ​​the side surface of the battery cell unit close to the insulating sheet.

[0009] As a preferred embodiment, the first thermally conductive insulating sheet, the second thermally conductive insulating sheet and the thermally insulating and flame-retardant sheet all have the same shape and size.

[0010] As a preferred embodiment, the thickness of the first thermally conductive insulating sheet is the same as the thickness of the second thermally conductive insulating sheet; the thickness of the thermal insulation and flame retardant sheet is greater than the thickness of the first thermally conductive insulating sheet.

[0011] As a preferred embodiment, the thickness of the insulating sheet is 0.5 mm to 5 mm.

[0012] As a preferred embodiment, the first thermally conductive insulating sheet and the second thermally conductive insulating sheet are both silicone thermally conductive insulating sheets; and the thermally insulating and flame-retardant sheet is a mica thermally insulating and flame-retardant sheet.

[0013] As a preferred embodiment, at least two first grooves are symmetrically arranged on the outer side of the first end plate; at least two second grooves are symmetrically arranged on the outer side of the second end plate; the two first grooves and the two second grooves are symmetrically arranged one by one.

[0014] As a preferred embodiment, one end of the steel belt is fixed in the first groove, and the other end is fixed in the second groove; at least two steel belts are provided, and the two steel belts are parallel to each other and symmetrically arranged.

[0015] As a preferred embodiment, adjacent battery cell units are connected in series or in parallel via connecting sheets.

[0016] As a preferred embodiment, the battery cell module is a lithium ion battery cell module, a sodium ion battery cell module or a potassium ion battery cell module.

[0017] The present application has good thermal insulation and flame retardant effects by arranging insulating sheets between adjacent battery cells and arranging the heat-insulating and flame-retardant sheets between the first heat-conducting insulating sheet and the second heat-conducting insulating sheet, which can ensure the heat dissipation of the battery cell surface and the insulation between the battery cell units, and can effectively prevent the heat spread of the battery cell unit caused by thermal runaway, thereby improving the safety performance of the battery pack without affecting the heat dissipation performance of the battery cell. The present application has a simple structure, low preparation cost, small size, stable connection, good sealing, and can be applied to large-capacity and large-size battery structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the overall structure of a battery module structure according to an embodiment of the utility model;

[0020] Figure 2 yes Figure 1 Schematic diagram of the overall structure of the battery module structure without steel strapping;

[0021] Figure 3 for Figure 1 A schematic diagram of the structure of an insulating sheet of a battery module structure;

[0022] Figure 4 for Figure 1 A schematic structural diagram of the first end plate of the battery module structure. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0024] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0025] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0028] In the ion battery structure of the embodiment of the present application, the number of battery cell units can be set according to actual usage needs, and can be set to one, two, three, four, six, eight or even more.

[0029] Specifically, Figures 1 to 4 As shown, an embodiment of the present application provides a battery module structure, including a first end plate 10, a battery cell module 20, a second end plate 30 and a plurality of steel strips 40; the first end plate 10 and the second end plate 30 are symmetrically arranged at both ends of the battery cell module 20, and the first end plate 10 and the second end plate 30 are respectively abutted against the battery cell module 20; one end of the steel strip 40 is fixed to the outer surface of the first end plate 10, and the other end is fixed to the outer surface of the second end plate 30, and the steel strip 40 is arranged on both sides of the battery cell module 20;

[0030] The battery cell module 20 includes a plurality of battery cell units 21, and an insulating sheet 22 is arranged between adjacent battery cell units 21; the insulating sheet 22 includes a first thermally conductive insulating sheet 221, a thermally insulating and flame-retardant sheet 222, and a second thermally conductive insulating sheet 223, and the thermally insulating and flame-retardant sheet 222 is arranged between the first thermally conductive insulating sheet 221 and the second thermally conductive insulating sheet 223, and the first thermally conductive insulating sheet 221 and the second thermally conductive insulating sheet 223 are respectively abutted against the adjacent battery cell units 21.

[0031] Specifically, in the present embodiment, eight battery cell units 21 are provided, and the eight battery cell units 21 are arranged in parallel and symmetrically. The eight battery cell units 21, the first end plate 10 and the second end plate 30 are fixed together by connecting plates and steel belts 40. The assembly and disassembly is convenient and easy to operate, which greatly improves the production efficiency and yield.

[0032] As a preferred embodiment, the first heat-conducting insulating sheet 221 and the second heat-conducting insulating sheet 223 are respectively abutted and connected with the heat-insulating flame-retardant sheet 222 .

[0033] As a preferred embodiment, the area of ​​the side surface of the insulating sheet 22 close to the battery cell unit 21 is less than or equal to the area of ​​the side surface of the battery cell unit 21 close to the insulating sheet 22 .

[0034] As a preferred embodiment, the first heat-conducting insulating sheet 221, the second heat-conducting insulating sheet 223 and the heat-insulating flame-retardant sheet 222 are all of the same shape and size. In this way, the heat dissipation on the surface of the battery cell 21 and the insulation between the battery cells 21 can be well ensured, and the heat spread caused by thermal runaway of the battery cell 21 can be effectively prevented.

[0035] As a preferred embodiment, the thickness of the first heat-conducting insulating sheet 221 is the same as that of the second heat-conducting insulating sheet 223; the thickness of the heat-insulating flame-retardant sheet 222 is greater than that of the first heat-conducting insulating sheet 221. In this way, the heat dissipation effect on the surface of the battery cell 21, the insulation effect between the battery cell 21, and the effect of preventing the heat spread of the battery cell 21 due to thermal runaway can achieve the best effect.

[0036] As a preferred embodiment, the thickness of the insulating sheet 22 is 0.5 mm to 5 mm. According to the actual use requirements, the thickness of the insulating sheet 22 can be 0.5 mm, 1.5 mm, 3.5 mm, 5 mm, etc. In this way, the heat dissipation effect on the surface of the battery cell 21, the insulation effect between the battery cell 21, and the effect of preventing the heat spread of the battery cell 21 due to thermal runaway can achieve better effects.

[0037] As a preferred implementation, in this embodiment, the first thermally conductive insulating sheet 221 and the second thermally conductive insulating sheet 223 are both silicone thermally conductive insulating sheets; the thermally insulating flame retardant sheet 222 is a mica thermally insulating flame retardant sheet. It is understandable that in other embodiments, the first thermally conductive insulating sheet 221 and the second thermally conductive insulating sheet 223 can also be made of other thermally conductive insulating materials, and the thermally insulating flame retardant sheet 222 can also be made of other thermally insulating flame retardant materials.

[0038] As a preferred embodiment, at least two first grooves 11 are symmetrically arranged on the outer surface of the first end plate 10; at least two second grooves 31 are symmetrically arranged on the outer surface of the second end plate 30; the two first grooves 11 and the two second grooves 31 are symmetrically arranged one by one. In this way, the battery module structure can be well bundled, the bundling stability is ensured, and the internal space of the module can be effectively saved.

[0039] As a preferred embodiment, one end of the steel belt 40 is fixed in the first groove 11, and the other end is fixed in the second groove 31; at least two steel belts 40 are provided, and the two steel belts 40 are parallel to each other and symmetrically arranged. The steel belt 40 is respectively adapted to the first groove 11 and the second groove 31, and the width of the steel belt 40 is less than or equal to the width of the first groove 11 (the width of the second groove 31); the thickness of the steel belt 40 is less than the depth of the first groove 11, and also less than the depth of the second groove 31, so that the battery module structure can be well bundled, so that the bundling and fixing cost of the module is low, and the internal space of the module can be effectively saved.

[0040] As a preferred embodiment, the adjacent battery cells 21 are connected in series or in parallel through the connecting piece 50. Specifically, in this embodiment, the adjacent battery cells 21 are connected in series through the connecting piece 50. It is understandable that, according to the actual use requirements, in other embodiments, the adjacent battery cells 21 can also be connected in parallel through the connecting piece 50, or the adjacent battery cells 21 can be connected in series and in parallel through the connecting piece 50.

[0041] As a preferred embodiment, the battery cell module is a lithium ion battery cell module, a sodium ion battery cell module or a potassium ion battery cell module. Specifically, in this embodiment, the battery cell module is a lithium ion battery cell module. It is understandable that in other embodiments, the battery cell module may also be a sodium ion battery cell module or a potassium ion battery cell module.

[0042] The present application has good thermal insulation and flame retardant effects by arranging insulating sheets between adjacent battery cells and arranging the heat-insulating and flame-retardant sheets between the first heat-conducting insulating sheet and the second heat-conducting insulating sheet, which can ensure the heat dissipation of the battery cell surface and the insulation between the battery cell units, and can effectively prevent the heat spread of the battery cell unit caused by thermal runaway, thereby improving the safety performance of the battery pack without affecting the heat dissipation performance of the battery cell. The present application has a simple structure, low preparation cost, small size, stable connection, good sealing, and can be applied to large-capacity and large-size battery structures.

[0043] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0044] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery module structure, characterized in that: It includes a first end plate, a battery cell module, a second end plate and a plurality of steel strips; the first end plate and the second end plate are symmetrically arranged at the two ends of the battery cell module, and the first end plate and the second end plate are respectively abutted against the battery cell module; one end of the steel strip is fixed to the outer surface of the first end plate, and the other end is fixed to the outer surface of the second end plate, and the steel strip is arranged on both sides of the battery cell module; The battery cell module includes a plurality of battery cell units, and an insulating sheet is arranged between adjacent battery cell units; the insulating sheet includes a first thermally conductive insulating sheet, a thermally insulating and flame-retardant sheet, and a second thermally conductive insulating sheet, and the thermally insulating and flame-retardant sheet is arranged between the first thermally conductive insulating sheet and the second thermally conductive insulating sheet, and the first thermally conductive insulating sheet and the second thermally conductive insulating sheet are respectively abutted against the adjacent battery cell units.

2. The battery module structure according to claim 1, characterized in that: The first heat-conducting insulating sheet and the second heat-conducting insulating sheet are respectively abutted and connected with the heat-insulating flame-retardant sheet.

3. The battery module structure according to claim 1, characterized in that: The area of ​​the side surface of the insulating sheet close to the battery cell unit is less than or equal to the area of ​​the side surface of the battery cell unit close to the insulating sheet.

4. The battery module structure according to claim 3, characterized in that: The first heat-conducting insulating sheet, the second heat-conducting insulating sheet and the heat-insulating flame-retardant sheet all have the same shape and size.

5. The battery module structure according to claim 1, characterized in that: The thickness of the first heat-conducting insulating sheet is the same as that of the second heat-conducting insulating sheet; the thickness of the heat-insulating flame-retardant sheet is greater than that of the first heat-conducting insulating sheet.

6. The battery module structure according to claim 1, characterized in that: The thickness of the insulating sheet is 0.5 mm to 5 mm.

7. The battery module structure according to claim 1, characterized in that: The first thermally conductive insulating sheet and the second thermally conductive insulating sheet are both silicone thermally conductive insulating sheets; and the thermally insulating and flame-retardant sheet is a mica thermally insulating and flame-retardant sheet.

8. The battery module structure according to claim 1, characterized in that: At least two first grooves are symmetrically arranged on the outer side of the first end plate; at least two second grooves are symmetrically arranged on the outer side of the second end plate; the two first grooves and the two second grooves are symmetrically arranged one by one.

9. The battery module structure according to claim 8, characterized in that: One end of the steel belt is fixed in the first groove, and the other end is fixed in the second groove; at least two steel belts are provided, and the two steel belts are parallel to each other and symmetrically arranged.

10. The battery module structure according to claim 1, characterized in that: The adjacent battery cells are connected in series or in parallel via connecting sheets; The battery cell module is a lithium ion battery cell module, a sodium ion battery cell module or a potassium ion battery cell module.

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