Lithium ion battery module

Abstract

The utility model discloses a lithium ion battery module which comprises a battery cell group and a Kevlar protective layer, side plates are arranged on the left side and the right side of the battery cell group respectively, and the Kevlar protective layer wraps the upper side and the lower side of the battery cell group and the sides, away from the battery cell group, of the side plates; the battery module has the advantage that the energy density of the battery module can be effectively improved on the premise of ensuring the structural strength of the battery module.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium batteries, and particularly relates to a lithium-ion battery module. Background Art

[0002] A lithium-ion battery module is a rechargeable battery, which has the advantages of high energy density, fast charge and discharge, long cycle life, no pollution, etc., and has been widely used in the fields of portable electronic devices, communication, energy storage and electric vehicles. Conventional lithium-ion battery modules, such as the lithium-ion battery module and lithium-ion battery disclosed in the application number CN202023155867.4, the lithium-ion battery module includes: a plurality of cores, the cores are stacked cores, wound cores or stacked cores or wound cores wrapped with a coating film; positive electrode tabs and negative electrode tabs are respectively arranged at both ends of each core, and the positive electrode tabs and negative electrode tabs on each end face of the core are connected by connecting pieces; a housing for accommodating the cores, a plurality of cavities are arranged in the internal space of the housing, and one core is arranged in each cavity; a cover plate for sealing the housing; a bus bar and an end bus bar arranged on the cover plate.

[0003] Conventionally, the housing is generally made of aluminum alloy. The aluminum alloy housing has a large mass, which has a great influence on the mass formation rate of the lithium-ion battery module and is not conducive to improving the energy density of the lithium-ion battery module. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a lithium-ion battery module, which can effectively improve the energy density of the battery module on the premise of ensuring the structural strength of the battery module.

[0005] The technical solution adopted by the utility model to solve the above technical problem is: a lithium-ion battery module, including a battery cell group and a Kevlar protective layer, side plates are respectively arranged on the left and right sides of the battery cell group, and the Kevlar protective layer covers the upper and lower sides of the battery cell group and the side of the side plate away from the battery cell group.

[0006] Preferably, the side plate is a carbon fiber plate.

[0007] Preferably, the Kevlar protective layer includes a Kevlar cloth, and the Kevlar cloth is wound and covered on the upper and lower sides of the battery cell group and the side of the side plate away from the battery cell group.

[0008] Preferably, the two ends of the Kevlar cloth are respectively bonded and fixed to the same side plate through an adhesive, and the middle part of the Kevlar cloth is bonded and fixed to the other side plate through an adhesive.

[0009] Preferably, one end of the Kevlar cloth is adhesively fixed to one of the side plates through an adhesive, the other end of the Kevlar cloth covers the Kevlar cloth and is adhesively fixed through an adhesive, and the middle part of the Kevlar cloth is adhesively fixed to the other side plate through an adhesive.

[0010] Preferably, the two ends of the Kevlar cloth are located on the side of one of the side plates away from the battery cell group.

[0011] Preferably, the wound Kevlar cloth forms a laminate, and the adjacent layers of Kevlar cloth are adhesively fixed through an adhesive.

[0012] Preferably, the adhesive is an epoxy resin adhesive.

[0013] Preferably, the side plate away from the battery cell group is provided with concave lines.

[0014] Preferably, the battery cell group includes a plurality of single battery cells arranged in the left-right direction, and pole ears are provided on the front side and / or the rear side of the single battery cells.

[0015] Compared with the prior art, the advantages of the present utility model are as follows:

[0016] 1. The Kevlar protective layer is used to replace the traditional metal module housing. The Kevlar protective layer has the advantages of low material density, high strength, good toughness, high temperature resistance, etc. On the premise of meeting the structural strength of the battery module, the mass grouping rate of the battery module can be effectively improved;

[0017] 2. Compared with the traditional metal module housing, the Kevlar protective layer is easy to process and has a lower manufacturing cost, which helps to reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] Figure 2 is an exploded structural diagram of the present utility model;

[0020] Figure 3 is a schematic side view structure of the present utility model Figure 1 ;

[0021] Figure 4 is Figure 3 an enlarged schematic view of part A in

[0022] Figure 5 is a schematic side view structure of the present utility model Figure 2 ;

[0023] Figure 6 is a schematic cross-sectional structure diagram of the present utility model;

[0024] Figure 7 This is a schematic diagram of the partial structure of the present utility model.

[0025] In the figure: 1, battery cell group; 11, single battery cell; 12, tab; 2, side plate; 21, concave pattern; 3, Kevlar protection layer; 31, Kevlar cloth; 4, adhesive. Specific embodiments

[0026] The following further describes the present utility model in detail with reference to the embodiments of the accompanying drawings.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying 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, and therefore should not be construed as a limitation of the present utility model.

[0028] Embodiment 1: As Figure 1 and Figure 2 shown, a lithium-ion battery module includes a battery cell group 1 and a Kevlar protection layer 3. Side plates 2 are respectively arranged on the left and right sides of the battery cell group 1, and the Kevlar protection layer 3 covers the upper and lower sides of the battery cell group 1 and the side of the side plate 2 away from the battery cell group 1.

[0029] In this embodiment, the side plate 2 is a carbon fiber plate, which is light in weight and high in strength. On the premise of ensuring the structural strength of the battery module, it helps to reduce the overall weight of the battery module. At the same time, the carbon fiber plate also has good thermal conductivity, which helps the battery module to dissipate heat better.

[0030] In this embodiment, the battery cell group 1 includes a plurality of single battery cells 11 arranged in the left-right direction. Tabs 12 are arranged on the front side and / or the rear side of the single battery cell 11. When the positive and negative tabs 12 are on the same side, both the positive and negative tabs 12 are on the front side or the rear side of the single battery cell 11. When the positive and negative tabs 12 are on different sides, tabs 12 are arranged on both the front side and the rear side of the single battery cell 11, which is specifically determined according to the actual selection of the single battery cell 11.

[0031] Embodiment 2: As Figure 3 and Figure 4 shown, the rest is the same as Embodiment 1, and the difference is that the Kevlar protection layer 3 includes Kevlar cloth 31, and the Kevlar cloth 31 is wound and covered on the upper and lower sides of the battery cell group 1 and the side of the side plate 2 away from the battery cell group 1. The Kevlar cloth 31 uses an aramid fiber composite material, and its strength is about five times that of steel, but the density is only about 1.44 g / cm 3 , while the density of steel is about 7.859 g / cm 3, the density of aluminum alloy is about 2.63-2.85g / cm 3 It can be seen that the use of Kevlar 31 to replace the traditional metal module shell can help to achieve the lightweight of the battery module and effectively improve the quality grouping rate of the battery module.

[0032] In this embodiment, the two ends of the Kevlar cloth 31 are respectively bonded and fixed to the same side panel 2 by adhesive 4 , and the middle part of the Kevlar cloth 31 is bonded and fixed to the other side panel 2 by adhesive 4 .

[0033] In this embodiment, the adhesive 4 is epoxy resin adhesive, and the thickness of the epoxy resin adhesive is preferably 0.09-0.3 mm. Its shear resistance can reach more than 7 MPa, which can meet the conventional expansion pressure range of the battery cell group 1 (0-3.5 MPa).

[0034] Embodiment 3: Figure 5 As shown, the rest of the parts are the same as those of the second embodiment, except that one end of the Kevlar cloth 31 is bonded and fixed to one side panel 2 by adhesive 4, the other end of the Kevlar cloth 31 covers the Kevlar cloth 31 and is bonded and fixed by adhesive 4, and the middle of the Kevlar cloth 31 is bonded and fixed to the other side panel 2 by adhesive 4. Compared with the second embodiment, the bonding surface is larger and the structural stability is better.

[0035] In this embodiment, two ends of the Kevlar cloth 31 are located on a side of the side plate 2 away from the battery cell group 1 .

[0036] Embodiment 4: Figure 6 As shown, the rest of the parts are the same as those of the second embodiment, except that the wound Kevlar cloth 31 forms a stack, and adjacent layers of Kevlar cloth 31 are bonded and fixed by adhesive 4. The stacking design can increase the overall thickness of the Kevlar protective layer 3 and improve the structural strength. The specific number of stacking layers depends on parameters such as the expansion force of the battery cell group 1.

[0037] Embodiment 5: Figure 7 As shown, the rest of the parts are the same as those of the second, third or fourth embodiments, except that a groove 21 is provided on the side of the side plate 2 away from the battery pack 1, and the design of the groove 21 helps to increase the size of the Kevlar cloth 31 (see Figure 5 ) and the bonding surface between the side panel 2, which helps to improve the bonding effect.

[0038] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. It is obvious that the implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A lithium-ion battery module, comprising a battery cell group (1), side plates (2) are respectively arranged on the left and right sides of the battery cell group (1), and it is characterized in that It further includes a Kevlar protective layer (3), and the Kevlar protective layer (3) covers the upper and lower sides of the battery cell group (1) and the side plate (2) on the side away from the battery cell group (1).

2. The lithium-ion battery module according to claim 1, wherein The side plate (2) is a carbon fiber plate.

3. A lithium-ion battery module according to claim 1, characterized in that The Kevlar protective layer (3) includes Kevlar cloth (31), and the Kevlar cloth (31) is wound and covers the upper and lower sides of the battery cell group (1) and the side plate (2) on the side away from the battery cell group (1).

4. A lithium-ion battery module according to claim 3, characterized in that The two end portions of the Kevlar cloth (31) are respectively bonded and fixed to the same side plate (2) through an adhesive (4), and the middle portion of the Kevlar cloth (31) is bonded and fixed to the other side plate (2) through the adhesive (4).

5. The lithium-ion battery module according to claim 3, characterized in that One end portion of the Kevlar cloth (31) is bonded and fixed to one side plate (2) through the adhesive (4), the other end portion of the Kevlar cloth (31) covers the Kevlar cloth (31) and is bonded and fixed through the adhesive (4), and the middle portion of the Kevlar cloth (31) is bonded and fixed to the other side plate (2) through the adhesive (4).

6. The lithium ion battery module according to claim 5, characterized in that The two end portions of the Kevlar cloth (31) are located in the direction of the side plate (2) on the side away from the battery cell group (1).

7. A lithium ion battery module according to claim 5, characterized in that The wound Kevlar cloth (31) forms a laminate, and adjacent layers of the Kevlar cloth (31) are bonded and fixed through the adhesive (4).

8. A lithium ion battery module according to claim 4, 5 or 7, characterized in that The adhesive (4) is an epoxy resin adhesive.

9. A lithium-ion battery module according to claim 4 or 5, characterized in that A concave pattern (21) is provided on the side plate (2) on the side away from the battery cell group (1).

10. A lithium-ion battery module according to claim 1, characterized in that The battery cell group (1) includes a plurality of single battery cells (11) arranged in the left - right direction, and electrode tabs (12) are provided on the front side and / or the rear side of the single battery cells (11).

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