CN218005128U - Group battery, battery package and car - Google Patents

Abstract

The application provides a group battery, battery package and car, this group battery includes: at least two batteries, wherein two opposite surfaces of two adjacent batteries are bonded and connected to form a bonding area, at least one of the two opposite surfaces is provided with a connection area exposed out of the battery shell, and the connection area is at least partially covered by the bonding area. In the technical scheme, the exposed connecting area of the shell is adopted, so that the bonding strength between the batteries is improved, and meanwhile, the insulating strength between the batteries is ensured.

Description

A battery pack, battery pack and automobile

technical field

The present application relates to the technical field of batteries, in particular to a battery pack, a battery pack and an automobile.

Background technique

During the manufacturing process of the battery pack, a plurality of batteries need to be bonded in a row. In order to ensure the insulation between the batteries, a layer of insulating layer is coated on the outside of the battery, but the thickness of the insulating layer is generally not too thick. When the battery pack is subjected to external force, it is easy to tear the insulating layer and damage the battery. connection effect.

Utility model content

The present application provides a battery pack, a battery pack and an automobile, which are used to improve the bonding strength of batteries between the battery packs.

In a first aspect, a battery pack is provided, the battery pack includes: at least two batteries, and the two opposite surfaces of two adjacent batteries are adhesively connected to form a bonding area, and the two opposite surfaces At least one of the surfaces has an exposed connection area of the battery case, the connection area being at least partially covered by the bonding area. In the above technical solution, the bonding strength between the batteries is improved by using the exposed connection area of the casing, and at the same time, the insulation strength between the batteries is ensured.

In a second aspect, a battery pack is provided, and the battery pack includes a casing, and the battery pack described in any one of the above-mentioned casings is disposed in the casing. In the above technical solution, the bonding strength between the batteries is improved by using the exposed connection area of the casing, and at the same time, the insulation strength between the batteries is ensured.

In a third aspect, an automobile is provided, which includes a vehicle body, and the battery pack as described in any one of the above, or the above-mentioned battery pack, arranged on the vehicle body. In the above technical solution, the bonding strength between the batteries is improved by using the exposed connection area of the casing, and at the same time, the insulation strength between the batteries is ensured.

Description of drawings

FIG. 1 is a schematic structural diagram of a battery pack provided in an embodiment of the present application;

FIG. 2 is a schematic structural view of a battery provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of the connection between batteries provided in the embodiment of the present application;

FIG. 4 is a schematic structural diagram of another connection between batteries provided by the embodiment of the present application.

detailed description

The present application will be further described in detail through the accompanying drawings and embodiments below. Through these descriptions, the features and advantages of the present application will become clearer and more specific.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as superior or better than other embodiments. While various aspects of the embodiments are shown in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In addition, the technical features involved in different embodiments of the present application described below may be combined with each other as long as they do not constitute a conflict with each other.

In order to facilitate the understanding of the battery pack provided in the embodiment of the present application, its structure is first introduced. The battery pack includes a plurality of batteries, and the multiple batteries are arranged to form a battery pack. When arranged into a battery pack, the cells are bonded to each other by adhesive bonding. In addition, in order to improve the insulation between the batteries, each battery is wrapped with an insulating film layer, and when the batteries are adhesively connected, they are connected through the adhesive connection between the insulating film layers. However, the insulating film itself is relatively thin, and when the battery is stressed, it is very easy to cause the insulating film to tear, thereby affecting the insulating performance of the battery. To this end, the embodiment of the present application provides a battery pack to improve the strength and insulation of the bonding between the batteries. It will be described in detail below in conjunction with specific drawings and embodiments.

Referring to FIG. 1 , the battery pack provided by the embodiment of the present application includes at least two batteries 10 , and two adjacent batteries 10 among the at least two batteries 10 are adhesively connected. Exemplarily, the minimum number of batteries 10 included in the battery pack may be two, and of course there may be more than one, and the batteries 10 may be arranged in different rows such as single row or multiple rows. In the embodiment of the present application, the adhesive connection between adjacent batteries 10 refers to the adhesive connection between batteries 10 located in the same row.

When two adjacent batteries 10 are bonded, the two opposite surfaces of the two adjacent batteries 10 are bonded and connected. Exemplarily, the battery 10 has a top surface and a bottom surface oppositely arranged, and four sides. The top surface is the surface provided with tabs, the bottom surface is the surface opposite to the top surface, and the four sides are located between the top surface and the bottom surface. The side is divided into a large side and a small side according to the size, wherein the small side is a side with a small area among the sides, and the large side is a side with a large area among the sides. That is, the side surfaces of the battery 10 include two opposite small sides and two opposite large sides.

When the batteries 10 are connected, adjacent batteries 10 are connected by side bonding. Specifically, the small sides of two adjacent batteries can be placed opposite each other, and the two opposite small sides can be adhesively connected; of course, when two large sides are placed oppositely, the two large sides can also be used Adhesive connection. During the specific connection, the connection of the two can be realized by adhesive glue, that is, adhesive glue (not shown) is bonded between the two opposite surfaces in two adjacent batteries 10, The two batteries 10 are adhesively connected. Exemplarily, the bonding glue may specifically be structural glue, glue, adhesive tape and the like.

When setting the adhesive, the greater the thickness of the adhesive, the greater the bonding strength between the battery 10 and the battery 10, but when the thickness of the adhesive is too large, the gap between the battery 10 and the battery 10 is too large. Large, the overall weight and volume of the battery pack are large, which affects the overall space utilization and energy density inside the 10-pack of batteries.

When an insulating layer is provided on the battery 10 , in the embodiment of the present application, an insulating layer may be provided for each battery 10 , or an insulating layer may be provided for some of the batteries 10 . That is, in at least two batteries 10 disclosed in this application, at least part of the casings of adjacent batteries are wrapped with an insulating layer. For batteries that are not coated with an insulating layer, in order to ensure their insulation during connection, a sufficient gap needs to be maintained between the two.

When the insulating layer is coated on the outer surface of the battery 10 casing, if its thickness is too large, the assembly size of the battery 10 will be increased, which is not conducive to improving the overall energy density of the battery 10 pack; if its thickness is too small, it will be unfavorable for the insulation of the battery 10. performance. Therefore, the thickness of the insulating layer provided is generally not too thick, and the structural strength is not too high. In the embodiment of the present application, the insulating layer can be an insulating coating coated or sprayed on the battery case with insulating paint; the insulating layer can also be an insulating film layer, and the insulating film layer can be directly coated on the battery case.

The connection strength between the insulating layer and the insulating layer is smaller than the connection strength between the battery case and the case, so when the battery is connected by the insulating layer, the insulating layer is easy to come out of the battery case under force , making it difficult to connect and fix the battery to the battery, and at the same time, the protruding insulation layer leads to the risk of insulation failure of the battery.

With reference to Fig. 2, in order to improve the connection strength between two batteries 10, two opposite surfaces of two adjacent batteries 10 are adhesively connected to form an adhesive zone, and at least one of the two opposite surfaces has The exposed connection area 11 of the battery case. The bare connection area 11 means that no other structures are arranged on the surface of the battery case, and the battery case is directly bonded to the connected battery. The above-mentioned bonding area refers to the area where the battery is bonded to each other when the battery is bonded. The bonding area is also the area where the adhesive glue is bonded to the battery.

During the adhesive connection, the connection zone 11 is at least partially covered by the adhesive zone. The casing of the battery 10 is directly exposed where the connection area 11 is located. When two adjacent batteries 10 are connected, the connection area 11 is at least partially covered by the adhesive area means that the adhesive glue can be directly bonded to the casing of the battery 10, thereby improving the connection strength of the battery 10 during bonding. .

As far as the connection region 11 is formed, it is at least partially uncovered by the insulating layer 12 . That is, when the connection area 11 is provided, all areas in the connection area 11 are exposed, or only a part of the area is exposed.

When forming the above-mentioned connection area 11, different methods can be adopted, such as the insulating layer 12 directly avoiding the connection area 11, forming an exposed case; or the insulating layer 12 wrapped by each battery 10 has a window corresponding to the connection area 11, The shell is exposed. That is, a window is opened on the insulating layer 12, so that the casing part of the battery 10 is exposed. When opening a window, the position of the window can be set at a certain position and the area can be adjusted as needed. The position and area of the opening of the insulating layer 12 are identified by the connection area 11 below.

When the connection area 11 is provided, the connection area 11 can be located at different positions on the surface where it is located. For example, the connection area 11 can be provided at the middle area of the surface where it is located, or at different positions such as the edge area of the surface where it is located. As a preferred solution, the connection area 11 is located in the middle area of the surface, so that the adhesive glue can also be located in the middle area during bonding. The above-mentioned middle area refers to the area surrounding the center of the surface where the connection area is located, and the middle area can be a circle, a direction, an ellipse, and other shapes of different shapes.

With regard to the shape of the connection area 11, different shapes can be selected. Exemplarily, the shape of the connection area 11 may be a circle, an ellipse, or a polygon such as a rectangle or a prism, or may also be a different shape. As a preference, the shape of the connection area 11 adopts a regular figure such as rectangle, ellipse or circle, so that the insulating layer 12 can open a window.

In addition, regarding the area of the connection area 11 , during setting, the ratio of the area of the connection area 11 to the surface of the battery casing where the connection area 11 is located is between 0.1-0.9. That is, the ratio of the area of the connecting region 11 to the area of the surface on which it is located is between 0.1 and 0.9. Exemplarily, the ratio of the area of the connecting region 11 to the area of the surface on which it is located is 0.1, 0.3, 0.6, 0.9, etc. .

When forming the connection area 11 , the two opposite surfaces of the two batteries 10 may have the connection area 11 respectively, or only one of the batteries 10 may have the connection area 11 . The two cases are described below.

Referring to FIG. 3 , in order to illustrate how the adhesive 20 is connected to the battery, the dotted line illustrates the structure of the part that is shielded when the battery is connected. In order to describe the connection of two batteries, the two batteries are respectively named as a first battery 10a and a second battery 10b.

When the first battery 10 a and the second battery 10 b are connected, the two opposite surfaces are bonded and connected by an adhesive 20 . As a preferred solution, the adhesive glue 20 is arranged in such a way as to cover at least the connection area 11 , so that the coating area of the adhesive glue 20 is larger and the connection strength between the batteries 10 is improved.

When only one cell has a connection region, that is, one of the adhesive regions on the two opposite surfaces of adjacent cells has a connection region. For convenience of description, the first battery 10a has the connection area 11 and the second battery 10b has no connection area as an example.

When the first battery 10a and the second battery 10b are connected by the adhesive 20, the thickness of the adhesive 20 and the thickness of the insulating layer will affect the energy density of the battery pack, so the thickness of the adhesive 20 when setting It should not be too large. However, it is also necessary to consider the insulation performance between the batteries to avoid that the insulation performance between the batteries cannot meet the requirements due to the opening of the window on the insulation layer on one battery. In order to meet the above conditions, when the casing of the first battery 10a and the insulating layer of the second battery 10b are bonded and connected by the adhesive glue 20, the two adjacent batteries (the first battery 10a and the second battery 10b) The resistance between them satisfies:

Among them, d1 and d2 are the thicknesses of the insulating layers on the two adjacent surfaces; d3 is the thickness of the bonding area; s1 and s2 are the areas of the insulating layers on the two adjacent surfaces; s3 is the area of the connection area; ρ1 And ρ2 is the volume resistivity of the insulating layer on the two adjacent surfaces, and ρ3 is the volume resistivity of the bonding area.

In the above formula, the insulation performance between batteries is jointly determined by the adhesive and the insulating layer. It can be seen from the layer structure between the batteries that along the direction of one battery pointing to the other battery, the path of the current is that the insulating film at the unopened place is connected in parallel with the adhesive glue at the opened window, and then connected to the other battery. The insulating film is connected in series.

The above data satisfy that: the thickness d3 of the adhesive is between 0.2mm-3mm and/or the thicknesses d1 and d2 of the insulating layer are both less than or equal to 0.14mm. That is to say, the thickness d3 of the adhesive can be between 0.2mm-3mm and the thicknesses d1 and d2 of the insulating layer are both less than or equal to 0.14mm; or, the thickness d3 of the adhesive can be between 0.2mm-3mm or the thickness of the insulating layer d1 and d2 are all less than or equal to 0.14mm. When selecting the above data, it needs to be selected according to the resistance between the batteries, that is, the resistance between the batteries needs to be greater than or equal to 15MΩ, so as to ensure that the resistivity between the batteries meets the insulation requirements.

Referring to Table 1, Table 1 illustrates the parameters of the insulating layer, the adhesive 20 and the connection area when the insulating layer on a battery is opened (single-sided window).

Table 1

Adhesive thickness d3 0.2mm～3mm Volume conductivity of the adhesive Ω·cm 10E*12-10E*13 The thickness of the insulating layer d1, d2 ≤0.14mm area S1=S2, S3/S2=10-90%

When using one-sided window opening, the thickness d3 of the adhesive, the thicknesses d1 and d2 of the insulating layer, the areas S1 and S2 of the insulating layer, and the area S3 of the connection area should ensure that the two batteries The resistance values between them are all greater than 15MΩ, meeting the requirements for insulation between batteries.

Referring to FIG. 4 , when double windows are used between the batteries, the two bonding areas on the opposite surfaces of the first battery 10 a and the second battery 10 b respectively have a connection area 11 a and a connection area 11 b.

The connection area 11a and the connection area 11b are oppositely arranged. And at least some areas of the two connecting regions 11 overlap. That is, when the two connecting regions 11 face each other, the adhesive glue 20 is at least partially connected to the connecting regions 11 on both sides.

When the connection area 11a and the connection area 11b are specifically arranged, it can be adopted: the connection area 11a and the connection area 11b completely overlap, or the connection area 11a and the connection area 11b are arranged alternately, but some areas overlap. This ensures that both sides of the adhesive 20 can be connected to the connection area 11a and the connection area 11b when bonding, that is, to be directly connected to the shells of the first battery 10a and the second battery 10b.

When the battery adopts double windows, the resistance between two adjacent batteries (the first battery 10a and the second battery 10b) satisfies:

Among them, d1 and d2 are the thicknesses of the insulating layers of the two adjacent surfaces; d3 is the thickness of the bonding area; s1 and s2 are the areas of the insulating layers of the two adjacent surfaces; s3 is the area of the connection area (connection region 11a and connection region 11b completely overlap); ρ1 and ρ2 are the volume resistivity of the insulating layers on the two adjacent surfaces, and ρ3 is the volume resistivity of the bonding region.

In the above formula, the insulation performance between batteries is jointly determined by the adhesive and the insulating layer. It can be seen from the layer structure between the batteries that along the direction of one battery pointing to the other, the current path is that the insulating films at the two unopened places are connected in parallel with the adhesive glue at the opened window and then connected in series.

The above data satisfy that: the thickness d3 of the adhesive is between 0.8mm-5mm and/or the thicknesses d1 and d2 of the insulating layer are both less than or equal to 0.14mm. That is to say, the thickness d3 of the adhesive can be between 0.2mm-3mm and the thicknesses d1 and d2 of the insulating layer are both less than or equal to 0.14mm; or, the thickness d3 of the adhesive can be between 0.2mm-3mm or the thickness of the insulating layer d1 and d2 are all less than or equal to 0.14mm. When selecting the above data, it needs to be selected according to the resistance between the batteries, that is, the resistance between the batteries needs to be greater than or equal to 15MΩ, so as to ensure that the resistivity between the batteries meets the insulation requirements.

Referring to Table 2, Table 2 illustrates the parameters of the insulating film, adhesive glue and connection area when the insulating film on the two batteries is used to open windows.

Table 2

When opening windows on both sides, the thickness d3 of the adhesive, the thicknesses d1 and d2 of the insulating layer, the areas S1 and S2 of the insulating layer, and the area S3 of the connection area should ensure that the two batteries The resistance values between them are all greater than 15MΩ, meeting the requirements for insulation between batteries.

In the above examples, only the resistances of two specific battery connection modes are illustrated. When the adhesive glue completely covers the connection area and connects with part of the insulating layer, the corresponding resistance can be calculated by referring to the principles of the formulas in the above two cases, which will not be repeated in the embodiment of the present application. In the same way, when two connection areas are used and the two connection areas are set in a staggered manner, the calculation method of the corresponding resistance can also be calculated by using the principles of the formulas of the two cases in the above example for deformation calculation. In the embodiment of this application will not go into details.

It can be seen from the above embodiments that in the battery pack used in the embodiment of the present application, the bonding strength between the batteries is improved and the insulation strength between the batteries is ensured at the same time by adopting the connection area for pasting the insulating layer.

The embodiment of the present application also provides a battery pack, the battery pack includes a casing, and any one of the above-mentioned battery packs arranged in the casing. In the above technical solution, the bonding strength between the batteries is improved by using the exposed connection area of the casing, and at the same time, the insulation strength between the batteries is ensured.

An embodiment of the present application provides an automobile, which includes a vehicle body, and a battery pack according to any one of the above, or the above battery pack, arranged on the vehicle body. In the above technical solution, the bonding strength between the batteries is improved by using the exposed connection area of the casing, and at the same time, the insulation strength between the batteries is ensured.

In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "back", "left", "right" etc. indicate orientation or position The relationship is an orientation or positional relationship based on the working state of the application, which is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as limiting the application.

In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be interpreted in a broad sense. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

The present application has been described above in conjunction with preferred implementations, but these implementations are only exemplary and serve as illustrations only. On this basis, various replacements and improvements can be made to the present application, all of which fall within the protection scope of the present application.

Claims (16)

1. A battery pack, comprising: at least two batteries, wherein two opposite surfaces of two adjacent batteries are bonded and connected to form a bonding area, at least one of the two opposite surfaces is provided with a connection area exposed out of the battery shell, and the connection area is at least partially covered by the bonding area.

2. The battery of claim 1, wherein the housing of at least some adjacent ones of the at least two cells are surrounded by an insulating layer; and the connection region is at least partially not covered with an insulating layer.

3. The battery according to claim 1, wherein the bonding areas of the two opposing surfaces are adhesively connected by a bonding glue, and the bonding glue covers at least the connection area.

4. The battery according to any one of claims 1-3, wherein one of the bonding areas of the opposing surfaces has the attachment area.

5. The battery pack according to claim 4, wherein the resistance between the adjacent two cells satisfies:

wherein d1 and d2 are the thicknesses of the insulating layers of the two adjacent surfaces; d3 is the thickness of the adhesive region; s1 and s2 are the areas of the insulating layers of the two adjacent surfaces; s3 is the area of the linking region; ρ 1 and ρ 2 are volume resistivities of the insulating layers of the adjacent two surfaces, and ρ 3 is a volume resistivity of the adhesion region.

6. The battery according to claim 5, wherein the thickness d3 of the adhesive region is between 0.2mm and 3mm; and/or the presence of a gas in the gas,

the thicknesses d1 and d2 of the insulating layers are less than or equal to 0.14mm.

7. The battery according to any one of claims 1 to 3, wherein two adhesive regions of the opposing surfaces have the connecting region, respectively, and the two connecting regions are disposed opposite to each other.

8. The battery pack according to claim 7, wherein the resistance between the adjacent two cells satisfies:

wherein d1 and d2 are the thicknesses of the insulating layers of the two adjacent surfaces; d3 is the thickness of the adhesive region; s1 and s2 are the areas of the insulating layers of the two adjacent surfaces; s3 is the area of the connecting region; ρ 1 and ρ 2 are volume resistivities of the insulating layers of the adjacent two surfaces, and ρ 3 is a volume resistivity of the adhesion region.

9. The battery of claim 8, wherein the thickness d3 of the adhesive region is between 0.8mm and 5mm; and/or the presence of a gas in the gas,

the thicknesses d1 and d2 of the insulating layers are less than or equal to 0.14mm.

10. The battery according to any one of claims 1 to 3, wherein the ratio of the area of the connection region to the cell surface where the connection region is located is 0.1 to 0.9.

11. The battery according to claim 10, wherein the connection region has a shape of a rectangle, an ellipse, or a circle.

12. The battery as defined in claim 11, wherein the connection region is located at a middle region of the surface of the battery.

13. The battery according to any one of claims 1 to 3, wherein the cell comprises four side surfaces and two oppositely disposed top and bottom surfaces, the four side surfaces being located between the top and bottom surfaces; and the two adjacent batteries are connected through side bonding.

14. The battery pack according to claim 13, wherein the side having a smaller area among the four sides of the cell is a small side, and the small sides of the adjacent two cells are opposed to each other and are adhesively connected.

15. A battery pack comprising a case, and the battery pack according to any one of claims 1 to 14 disposed in the case.

16. An automobile comprising a vehicle body, and a battery pack according to any one of claims 1 to 14 or a battery pack according to claim 15 provided on the vehicle body.

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