Battery module and battery pack

Abstract

The utility model discloses a battery module and a battery pack, the battery module comprises a battery assembly and an insulating assembly, the battery assembly comprises a battery cell group, and the battery cell group comprises a plurality of single battery cells which are sequentially stacked; the insulating assembly comprises a plurality of battery cell insulating films and a plurality of reinforcing insulating parts, each battery cell insulating film respectively wraps the outer surface of each single battery cell, and each reinforcing insulating part is respectively arranged between two adjacent single battery cells. According to the battery module disclosed by the utility model, the battery assembly and the insulating assembly are arranged, so that the single battery cores can be respectively wrapped with the battery core insulating films to realize an insulating protection effect, and meanwhile, the reinforcing insulating part is additionally arranged between the two adjacent single battery cores, so that the insulating level and the insulating strength are further improved through the reinforcing insulating part.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery module and battery pack. Background Technology

[0002] With the rapid development of new energy vehicles, rail transit, and other fields, battery modules, as core energy sources, have become a focus of industry attention regarding their performance and safety. As a high-voltage energy storage system, the insulation safety of power battery modules cannot be ignored, and insulation withstand voltage performance is the most basic indicator for measuring the safety performance of a battery system.

[0003] However, the insulation performance of existing battery modules is still insufficient. For example, existing battery modules use an insulating film wrapped around the outer shell of the battery cell for insulation, which has a relatively low insulation level. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a battery module that can improve the insulation level and enhance the insulation strength of the battery module.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A battery module includes: a battery assembly and an insulation assembly. The battery assembly includes a cell group, which includes a plurality of individual cells stacked sequentially. The insulation assembly includes a plurality of cell insulating films and a plurality of reinforcing insulating members. Each cell insulating film is wrapped around the outer surface of each individual cell, and each reinforcing insulating member is disposed between two adjacent individual cells.

[0007] In one embodiment, the cell insulating film is an insulating blue film.

[0008] In one embodiment, the reinforcing insulation element is an aerogel felt.

[0009] In one embodiment, the reinforcing insulation is disposed between the large surfaces of two adjacent individual cells, and the area of ​​the reinforcing insulation accounts for 50% to 90% of the area of ​​the corresponding bonding surface of the individual cell.

[0010] In one embodiment, the battery assembly further includes a first end plate and a second end plate, the first end plate and the second end plate being respectively disposed at both ends of the battery cell assembly, and the first end plate being provided with a first insulating layer, and / or the second end plate being provided with a second insulating layer.

[0011] In one embodiment, the first insulating layer and / or the second insulating layer are both insulating magnetic varnish layers.

[0012] In one embodiment, the insulation assembly further includes a first end face insulator disposed between the first end plate and the adjacent individual cell, and / or a second end face insulator disposed between the second end plate and the adjacent individual cell.

[0013] In one embodiment, the insulation component further includes a first side insulation member and a second side insulation member, which are respectively disposed on both sides of the battery cell assembly.

[0014] In one embodiment, the insulation component further includes a top insulation member and / or a bottom insulation member, the top insulation member being disposed at the top of the battery assembly and the bottom insulation member being disposed at the bottom of the battery assembly.

[0015] In one embodiment, the battery assembly includes a steel strip that is bundled to the battery cell assembly, and a steel strip insulator is fitted onto the steel strip.

[0016] In one embodiment, the insulating assembly further includes a connecting bar insulator, and the battery assembly further includes a connecting bar; the connecting bar is disposed on the connecting bar insulator and passes through a through hole on the connecting bar insulator to be welded to the tab of the corresponding individual battery cell.

[0017] A battery pack comprising one or more of the aforementioned battery modules.

[0018] Compared with the prior art, the present invention has at least the following advantages:

[0019] The battery module of this utility model, by setting up battery components and insulation components, can achieve insulation protection by wrapping the individual battery cells with insulation films. At the same time, a reinforcing insulation component is added between two adjacent individual battery cells to further improve the insulation level, that is, to increase the insulation strength. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0021] Figure 1 This is a schematic diagram of the battery module in one embodiment of the present invention;

[0022] Figure 2 This is an exploded view of the battery module in one embodiment of the present invention. Detailed Implementation

[0023] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0024] Please see Figure 1 and Figure 2 As shown, a battery module 10 includes a battery assembly 100 and an insulation assembly 200. The battery assembly 100 includes a cell assembly 110, which includes a plurality of individual cells 111 stacked sequentially. The insulation assembly 200 includes a plurality of cell insulating films and a plurality of reinforcing insulating members 210. Each cell insulating film is wrapped around the outer surface of each individual cell 111, and each reinforcing insulating member 210 is disposed between two adjacent individual cells 111.

[0025] It should be noted that by wrapping the individual cell 111 with a cell insulating film, insulation protection is achieved. At the same time, a reinforcing insulating component 210 is added between two adjacent individual cells 111. The reinforcing insulating component 210 further increases the insulation strength between the two adjacent individual cells, that is, further improves the insulation level of the battery module.

[0026] Preferably, the insulating film for the battery cell is an insulating blue film. In this embodiment, the insulating blue film is made of PET (polyethylene terephthalate). PET film material possesses excellent physical and chemical properties. For example, PET film has excellent physical properties such as toughness, high tensile strength, and high impact strength, while also possessing excellent chemical properties such as good chemical resistance, good oil resistance, and good weather resistance. Therefore, it not only ensures that the battery module has better insulation protection, but also improves the isolation and protection of the individual battery cells 111, thereby increasing the overall service life of the battery module. Preferably, the thickness of the insulating blue film is 0.1 mm.

[0027] Preferably, the reinforcing insulation component 210 is an aerogel felt. For example, the aerogel felt can be bonded to the individual battery cells 111 with insulating adhesive, thereby further increasing the insulation strength between the individual battery cells.

[0028] In one embodiment, the reinforcing insulation member 210 is disposed between the large surfaces of two adjacent individual cells 111, and the area of ​​the reinforcing insulation member 210 accounts for 50% to 90% of the area of ​​the corresponding individual cell 111 contact surface, preferably 63.7% to 64.7%, to ensure the best insulation effect.

[0029] In one embodiment, the battery assembly 100 further includes a first end plate 120 and a second end plate 130, which are respectively disposed at both ends of the cell assembly 110, and a first insulating layer is disposed on the first end plate 120 and / or a second insulating layer is disposed on the second end plate 130.

[0030] It should be noted that the first end plate 120 and the second end plate 130 limit and fix the cell assembly 110 in the thickness direction. Simultaneously, a first insulating layer is provided on the first end plate 120, that is, a first insulating layer is provided on the outer surface of the first end plate 120, thereby improving the insulation protection effect of the first end plate 120, and further enhancing the insulation isolation between the first end plate 120 and the cell assembly. Similarly, a second insulating layer is provided on the second end plate 130, that is, a second insulating layer is provided on the outer surface of the second end plate 130, to further improve the insulation protection effect of the second end plate 130, and further enhance the insulation isolation between the first end plate 120 and the cell assembly. This makes the battery module more suitable for applications with high insulation requirements, such as new energy electric locomotives. Preferably, the first insulating layer and / or the second insulating layer are both insulating magnetic paint layers, which can be applied by spraying onto the outer surfaces of the first end plate 120 and the second end plate 130 respectively; for example, the insulating magnetic paint is bright red fluorocarbon surface insulating magnetic paint with a thickness of 450 to 600 μm.

[0031] Furthermore, the insulation assembly also includes a first end-face insulator 220 disposed between the first end plate 120 and its adjacent individual cell 111, and / or a second end-face insulator disposed between the second end plate 130 and its adjacent individual cell 111. Thus, the insulation level of the battery module is further improved by using the first end-face insulator 220 and the second end-face insulator. For example, both the first end-face insulator 220 and the second end-face insulator are insulating sheets made of PC (polycarbonate); or, for example, the insulating sheet can be glued between the end plate and the individual cell 111, and the thickness of the insulating sheet is 0.3 mm.

[0032] Furthermore, the insulation assembly 200 also includes a first side insulator 230 and a second side insulator, which are respectively disposed on both sides of the cell assembly 110. The first side insulator 230 and the second side insulator further improve the insulation effect on both sides of the cell assembly 110; for example, both the first side insulator 230 and the second side insulator are PC material insulating sheets. It should also be noted that by surrounding the four sides of the cell assembly 110 with the first end face insulator 220, the second end face insulator, the first side insulator 230, and the second side insulator, the insulation protection effect is further enhanced, thereby improving the safety performance of the battery module and meeting the usage requirements of high-insulation applications such as new energy vehicles.

[0033] In one embodiment, the insulation component 200 further includes a top insulator 240 and / or a bottom insulator. The top insulator 240 is disposed on the top of the battery assembly 100, and the bottom insulator is disposed on the bottom of the battery assembly 100. That is, the top insulator 240 and / or the bottom insulator can ensure the insulation effect of the top and / or bottom of the battery module. For example, both the top insulator 240 and the bottom insulator are PC insulating sheets with a thickness of 0.3mm. It should also be noted that the top insulator 240 covers the top of the battery assembly 100. While covering the battery module's data acquisition harness, the top insulator 240 can also prevent foreign objects from falling between individual cells 111 during the manufacturing process, thus preventing the risk of insulation failure between individual cells 111.

[0034] In one embodiment, the battery assembly 100 includes a steel strip 140, which is bundled onto the cell assembly 110, and a steel strip insulating element is fitted onto the steel strip 140. The steel strip 140 limits the position of the cell assembly 110 to prevent displacement of individual cells 111, while the steel strip insulating element further enhances insulation protection. For example, the steel strip insulating element is an insulating heat-shrink tubing.

[0035] In one embodiment, the insulating assembly 200 further includes a connecting bar insulating member 250, and the battery assembly 100 further includes a connecting bar; the connecting bar is disposed on the connecting bar insulating member 250 and passes through a through hole on the connecting bar insulating member 250 to be welded to the tab of the corresponding single cell 111.

[0036] It should be noted that the non-connecting portion of the connecting bus is separated from the individual battery cell 111 by the connecting bus insulation component 250, thereby achieving insulation isolation. The connecting portion of the connecting bus passes through the through hole on the connecting bus insulation component 250 and is welded to the corresponding electrode tab of the individual battery cell 111. Specifically, the connecting bus includes a negative output bus 160, a positive output bus 150, and a battery cell series bus 170. The negative output bus 160 is provided with the negative output terminal of the battery cell group, while the positive output bus 150 is provided with the positive output terminal of the battery cell group. For example, the positive and negative output terminals of the battery cell group are located on the outermost individual battery cells 111 on both sides of the battery cell group, and the battery cell series bus 170 is used to connect two adjacent individual battery cells 111 in series. The connecting bus can be made of aluminum or copper. In this embodiment, the connecting bus insulation component 250 is an insulating sheet made of PC material.

[0037] In one embodiment, an insulating heat-shrinkable sleeve is fitted onto the positive output terminal 150. Specifically, the insulating heat-shrinkable sleeve is fitted onto the non-connection area of ​​the positive output terminal 150 to further enhance the insulation protection. Similarly, an insulating heat-shrinkable sleeve is also fitted onto the negative output terminal 160, and the insulating heat-shrinkable sleeve is fitted onto the non-connection area of ​​the negative output terminal 160.

[0038] In one embodiment, the battery assembly further includes a positive electrode base 180 and a positive electrode protective cover 190. The positive electrode base 180 is disposed on the first end plate 120 and has a positive electrode protection cavity. The positive electrode protective cover 190 is disposed at the opening of the positive electrode protection cavity, and one end of the positive electrode output line 150 connected to the single cell 111 extends into the positive electrode protection cavity, so that one end of the positive electrode output line 150 is located between the bottom of the positive electrode protection cavity and the positive electrode protective cover 190. In this way, the positive electrode output line 150 can be isolated and protected by the positive electrode base 180 and the positive electrode protective cover 190 to prevent external foreign objects from contaminating or damaging the positive electrode output line 150. In addition, the positive electrode protective cover 190 is detachably disposed on the positive electrode base 180. For example, the positive electrode protective cover 190 is connected and fixed to the positive electrode base 180 by a snap-fit ​​connection. In this way, it is easy to bind and connect the positive electrode output line 150 to other devices by removing the positive electrode protective cover 190.

[0039] Furthermore, in this embodiment, the positive electrode base 180 is a base made of insulating material, such as a plastic base; and the positive electrode protective cover 190 is also a protective cover made of insulating material, such as a plastic protective cover; thus, the insulation protection effect can be further improved, making the battery module more suitable for application scenarios with high insulation requirements.

[0040] Similarly, the battery assembly also includes a negative electrode base and a negative electrode protective cover. The negative electrode base is disposed on the first end plate 120, and a negative electrode protection cavity is provided on the negative electrode base. The negative electrode protective cover is disposed at the opening of the negative electrode protection cavity, and one end of the negative electrode output row 160 connected to the single cell 111 extends into the negative electrode protection cavity, so that one end of the negative electrode output row 160 is located between the bottom of the negative electrode protection cavity and the negative electrode protective cover. In this way, the negative electrode output row 160 can be isolated and protected by the negative electrode base and the negative electrode protective cover to prevent external foreign objects from contaminating or damaging the negative electrode output row 160. In addition, the negative electrode protective cover is detachably disposed on the negative electrode base. For example, the negative electrode protective cover is fixed to the negative electrode base by means of a snap-fit ​​connection. In this way, it is easy to bind the negative electrode output row 160 to other devices by removing the negative electrode protective cover.

[0041] Furthermore, in this embodiment, the negative electrode base is an insulating material, such as a plastic base; and the negative electrode protective cover is also an insulating material, such as a plastic protective cover; thus, the insulation protection effect can be further improved, making the battery module more suitable for application scenarios with high insulation requirements.

[0042] A battery pack includes one or more of the aforementioned battery modules. When there are multiple battery modules, they are connected in series to form the battery pack.

[0043] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery module, characterized in that, include: A battery assembly, the battery assembly including a cell group, the cell group including a plurality of individual cells stacked sequentially; and An insulating assembly includes multiple cell insulating films and multiple reinforcing insulating members. Each cell insulating film is wrapped around the outer surface of each individual cell, and each reinforcing insulating member is disposed between two adjacent individual cells.

2. The battery module according to claim 1, characterized in that, The insulating film of the battery cell is an insulating blue film.

3. The battery module according to claim 1, characterized in that, The reinforcing insulation component is an aerogel felt.

4. The battery module according to claim 1, characterized in that, The reinforcing insulation element is disposed between the large surfaces of two adjacent individual cells, and the area of ​​the reinforcing insulation element accounts for 50% to 90% of the area of ​​the corresponding bonding surface of the individual cell.

5. The battery module according to claim 1, characterized in that, The battery assembly further includes a first end plate and a second end plate, which are respectively disposed at both ends of the battery cell assembly; and a first insulating layer is disposed on the first end plate, and / or a second insulating layer is disposed on the second end plate.

6. The battery module according to claim 5, characterized in that, The first insulating layer and / or the second insulating layer are both insulating magnetic paint layers.

7. The battery module according to claim 5, characterized in that, The insulation assembly further includes a first end face insulator disposed between the first end plate and the adjacent individual cell, and / or a second end face insulator disposed between the second end plate and the adjacent individual cell.

8. The battery module according to any one of claims 1-7, characterized in that, The insulation component further includes a first side insulation member and a second side insulation member, which are respectively disposed on both sides of the battery cell assembly.

9. The battery module according to any one of claims 1-7, characterized in that, The insulation component further includes a top insulation member and / or a bottom insulation member, wherein the top insulation member is disposed at the top of the battery assembly and the bottom insulation member is disposed at the bottom of the battery assembly.

10. The battery module according to any one of claims 1-7, characterized in that, The battery assembly includes a steel strip, which is bundled to the battery cell assembly, and a steel strip insulation element is sleeved on the steel strip.

11. The battery module according to any one of claims 1-7, characterized in that, The insulating component further includes a connecting bar insulating member, and the battery assembly further includes a connecting bar; the connecting bar is disposed on the connecting bar insulating member and passes through a through hole on the connecting bar insulating member to be welded to the tab of the corresponding individual battery cell.

12. A battery pack, characterized in that, Includes one or more battery modules as described in any one of claims 1-11.

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