WO2020155269A1

WO2020155269A1 - Battery pack

Info

Publication number: WO2020155269A1
Application number: PCT/CN2019/076290
Authority: WO
Inventors: 陈兴地; 唐彧; 游凯杰; 余勇飞; 杨中飞; 方仲褀
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2019-01-28
Filing date: 2019-02-27
Publication date: 2020-08-06
Also published as: CN209169258U

Abstract

The present application relates to the field of energy storage elements, and in particular to a battery pack. The battery pack comprises a battery module, a net-shaped insulating pad, and a lower box, wherein the battery module is accommodated inside the lower box, and the net-shaped insulating pad is arranged between the battery module and the lower box. According to the battery pack provided by the present application, by means of providing the net-shaped insulating pad, the battery module is effectively isolated from the lower box, so as to avoid a short circuit caused by poor flatness of the lower box, and the battery module does not come into contact with the lower box even if the battery module expands and during the charging and discharging, so as to further avoid short circuiting.

Description

Battery pack

This application claims the priority of the Chinese patent application filed with the Chinese Patent Office on January 28, 2019, the application number is 201920144067.0, and the invention name is "battery pack", the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the field of energy storage elements, and in particular to a battery pack.

Background technique

The battery pack generally includes a battery box and a battery module. The battery box includes a lower box and an upper cover. After the battery module is installed on the lower box, if the flatness of the bottom inside the lower box is poor, the lower box will touch the battery Module, so that the battery module has the risk of short circuit.

Application content

The present application provides a battery pack to solve the above technical problem and avoid contact short circuit between the battery module and the lower case.

The present application provides a battery pack, including a battery module, a mesh insulating pad, and a lower box; the battery module is accommodated in the lower box, and the mesh insulating pad is arranged on the battery module And the lower box.

Preferably, the mesh insulation pad has a plurality of mesh holes.

Preferably, the battery module and the lower case are fixed by an adhesive layer.

Preferably, the adhesive layer is distributed in the plurality of meshes.

Preferably, the thickness of the glue layer is the same as the thickness of the mesh insulating pad.

Preferably, the battery module includes a plurality of battery cells;

The area of the mesh is greater than or equal to half of the bottom area of the single battery cell.

Preferably, the area of the mesh is smaller than or equal to the bottom area of a single battery cell.

Preferably, the battery unit includes a cuboid-shaped casing and a cover plate covering the opening of the casing;

When installing the battery module to the lower box, the larger surface of the shell in the plane perpendicular to the cover plate is the installation surface of the battery module.

Preferably, the material of the mesh insulation pad is polycarbonate.

Preferably, the mesh on the mesh insulation pad is a diamond-shaped hole.

The technical solution provided by this application can achieve the following beneficial effects:

The battery pack provided by this application includes a battery module, a mesh insulating pad and a lower box. A mesh insulating pad is arranged between the battery module and the lower box. By setting the mesh insulating pad, the The battery module is isolated from the lower box, avoiding the short circuit of the battery module due to the poor flatness of the lower box.

It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the application.

Description of the drawings

In order to more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the specific embodiments or the description of the prior art. Obviously, the appendix in the following description The drawings are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a structural exploded view of the battery pack provided by the first embodiment of this application;

2 is an exploded view of the structure of the battery pack provided by the second embodiment of this application;

3 is an exploded view of the structure of the battery pack provided by the third embodiment of the application.

icon:

1- Battery pack;

11- Battery module;

111-Battery unit;

111a-shell;

111b-cover plate;

111c-electrode terminal;

112-bus bar;

113-lead terminal;

12-Mesh insulation pad;

121-Mesh;

13- Lower cabinet;

14-Upper cover.

detailed description

The application will be further described in detail below through specific embodiments in conjunction with the drawings.

As shown in FIG. 1, an embodiment of the present application provides a battery pack 1, which includes a battery module 11, a mesh insulation pad 12 and a lower box 13. Generally, the battery pack 1 also includes an upper cover 14. The lower case 13 is made of metal. The lower case 13 and the upper cover 14 are mated and connected to form a receiving cavity for accommodating the battery module 11, and the battery module 11 is arranged in the receiving cavity. The number of battery modules 11 is not limited, and can be one or more.

The battery module 11 can be divided into an upright type, a lying type and a side lying type. The battery module 11 includes a plurality of battery cells 111. Referring to FIGS. 2 and 3, each battery cell 111 includes a housing 111a, a cover plate 111b, and an electrode terminal 111c. The electrode terminal 111c includes a positive terminal electrically connected to the positive electrode and an electrical The negative terminal connected to the negative electrode, and the electrode terminal 111c is connected in series or in parallel as required. As shown in FIG. 1, the electrode terminals 111c of the plurality of battery cells 111 are connected in series through the bus bar 112, and finally led to the outside through the lead-out terminal 113. The shell 111a is usually a rectangular parallelepiped structure, and the bottom surface parallel to the cover plate 111b is the mounting surface (installed on the lower box 13), and the electrode terminal 111c faces upwards, which is called an upright type, as shown in Figure 2, which is an upright battery Module 11; when the larger surface of the plane perpendicular to the cover plate 111b is the mounting surface (installed in the lower box 13), the electrode terminal 111b faces the side, which is called the flat type (the state shown in Figure 1); When the smaller surface in the plane where the cover plate 111b is located is the mounting surface (installed on the lower box 13), the electrode terminal 111b faces the side, which is called the side-lying type (the state shown in FIG. 3). During installation, the battery module 11 and the mesh insulation pad 12 are put into the lower case 13, and the lower case 13 is matched with the upper cover 14 to form the battery pack 1.

The flatness of the lower case 13 is not high due to the manufacturing precision of the lower case 13. In order to avoid contact between the battery module 11 and the lower case 11 and cause a short circuit, a mesh insulating pad 12 is arranged on the battery module 11 and A mesh insulation pad 12 is provided between the lower boxes 13 to effectively isolate the battery module 11 from the lower box 13 and avoid short circuit of the battery module 11 due to the poor flatness of the lower box 13.

Preferably, the mesh insulating pad 12 has a plurality of mesh holes 121, so that while isolating the battery module 11 from the lower case 13, it can also play a role in facilitating the heat dissipation of the battery module 11. The hole 121 can therefore reduce the overall weight of the mesh insulating pad 12 and achieve the weight reduction of the battery pack. The number of meshes 121 is not limited here, and can be specifically designed according to the size of the mesh insulating pad 12 and the bottom area of the battery cell 111. The relationship between the area of the mesh 121 and the battery cell 111 will be described in detail below.

The battery module 11 and the lower box 13 can be fixed in a variety of ways. As an implementation mode, the battery module 11 and the lower box 13 can be fixed with an adhesive layer (not shown in the figure). At this time, the glue can be applied to the lower box 13 first, and then put into the mesh insulating pad 12, and then the battery module 11 is installed. The glue solidifies to form a glue layer, so that the battery module 11 and the lower box 13 are fixedly connected. Of course, the mesh insulating pad 12 can also be pre-fixed with the battery module 11 manually or by a manipulator, and then put into the lower box 13 where the glue is applied, and the glue passes through the mesh 121 on the mesh insulating pad 12. Bonded with the battery module 11. It can be understood that those skilled in the art can adjust the installation sequence according to the actual situation, which is not limited here. During the above-mentioned gluing and installation process, the battery module 11 and the lower case 13 are fixed by the glue layer, which prevents the battery module 11 from moving in the lower case 13 which may affect the performance of the battery pack. Preferably, the glue is a structural glue.

Since the mesh insulation pad 12 has a plurality of meshes 121, the glue layer is distributed in the plurality of meshes 121 after solidification. Those skilled in the art can understand that the glue layer may be distributed in part or most of the mesh 121, which can also play a role in fixing the battery module 121. Preferably, all the meshes 121 are filled with a glue layer, so that the connection area between the battery module 11 and the lower case 13 is larger, and the connection is more uniform and reliable.

Further preferably, the thickness of the glue layer is the same as the thickness of the mesh insulating pad 12. During the gluing process, if the amount of glue applied is too small, it will affect the reliability of the connection between the battery module 11 and the lower box 13; if the amount of glue is too much, it will cause the glue layer to be too thick and waste, and Affect the overall size of the battery pack. By providing the mesh insulating pad 12, the peripheral structure surrounding the mesh 121 has a limiting effect on the glue, so that the thickness of the glue layer can be controlled to be the same as the thickness of the mesh insulating pad 12. In this way, the rationality of the glue amount is ensured, the connection between the battery module 11 and the lower box 13 is reliable, and the waste caused by the excessive glue amount and the impact on the overall size of the battery pack are avoided.

Preferably, the battery module 11 includes a plurality of battery cells 111. Since the battery module 11 and the lower case 13 are fixed by a glue layer, if the amount of glue is too small, the battery module 11 will fall off. Therefore, the area of the mesh 121 on the mesh insulating pad 12 cannot be too small. If it is too small, it will hinder the penetration of the glue through the mesh 121, thereby affecting the glue and the battery module 11. In the embodiment of the present application, The area of the mesh 121 on the mesh insulating pad 12 is greater than or equal to half of the bottom area of the single battery cell 111 in the battery module 11. Taking the flat battery module 11 in FIG. 1 as an example, the side facing each other with the lower case 13 is the bottom surface of the battery unit 111, and the area of the bottom surface of the battery unit 111 is the aforementioned bottom area. By setting the area of the mesh 121 on the mesh insulating pad 12 to be greater than or equal to half of the bottom area of the single battery cell 111 in the battery module 11, the unreliable bonding caused by the too small mesh 121 is avoided.

In addition, if the area of the mesh 121 is too large, the insulating effect of the mesh insulating pad 12 between the battery module 11 and the lower case 13 will be weakened. Therefore, in the embodiment of the present application, the area of the mesh 121 Less than or equal to the bottom area of a single battery cell. As a result, the area of the mesh 121 will not be too large or too small, which can not only ensure a firm bond between the battery module 11 and the lower case 13, but also effectively bond the battery module 11 and the lower case 13 Ground isolation prevents the battery module 11 from short-circuiting.

Those skilled in the art can understand that the above-mentioned battery module 11 may be a flat type, as shown in FIG. 1, that is, in the battery cells 111 stacked on each other, the larger surface of the plane perpendicular to the cover plate 111b faces the lower box. 13. The battery module 11 can also be upright, as shown in FIG. 2, that is, the battery cells 111 are stacked in one direction, with the electrode terminals 111 c facing upward, and the bottom surface parallel to the cover plate 111 b of the battery cell 111 faces the lower box 13. The battery module 11 may also be a side-lying type, as shown in FIG. 3, that is, in the battery cells 111 stacked on each other, the smaller surface in the plane perpendicular to the cover plate 111 b faces the lower box 13.

In this embodiment, it is preferable that the battery module 11 is a flat type. Compared with the side-lying and upright battery modules, the single battery unit 111 of the flat battery module 11 is connected to the lower box 13 Therefore, for the mesh insulation pad 12, the mesh 121 does not need to be too dense to ensure the connection effect of the glue and simplify the manufacturing process of the mesh insulation pad 12. For the vertical battery module, since the connection area between the single battery unit 111 and the lower case 13 is relatively small, in order to ensure the bonding effect, the mesh 121 needs to be denser than that of the flat battery module. For the side-lying battery module, the arrangement of the mesh 121 also needs to be denser than that of the flat-lying battery module. Therefore, setting the battery module in a flat type can simplify the manufacturing process of the mesh insulating pad 12 to the greatest extent and reduce the production cost.

As a preferred implementation manner, the material of the mesh insulating pad 12 is polycarbonate (PC), and the mesh insulating pad 12 made of PC has certain elasticity without excessive deformation. When the battery module 11 is installed, The battery module 11 will not squash the mesh insulating pad 12, but the mesh insulating pad 12 has a certain degree of elasticity, so it can ensure that the distance between the battery module 11 and the lower box 13 is kept within a proper range, namely Played an isolation role and played a buffer role.

The overall shape of the mesh insulation pad 12 can be adapted to the battery module 11 and the lower box 13. Generally, the battery module 11 is roughly rectangular parallelepiped. Therefore, the overall shape of the mesh insulation pad 12 may be a rectangle. The rectangular mesh insulating pad 12 is matched with the shape of the lower box 13 to avoid the size and area of the mesh insulating pad 12 being too large or too small. Of course, the shape of the mesh insulating pad 12 can also be set to other shapes according to the shape design of the battery module 11, which is not limited here.

In addition, the overall area of the mesh insulating pad 12 should not be too large. If it is too large, when installing between the battery module 11 and the lower box 13, an extra part will be generated on the edge of the mesh insulating pad 12, occupying the lower box. If the overall area of the mesh insulating pad 12 is too small, it will only isolate the part of the battery module 11, which will affect the isolation effect between the battery module 11 and the lower box 13. Therefore, it is preferable that the overall area of the mesh insulation pad 12 is approximately the same as the installation area of the battery module 11 as a whole. After the installation of the battery module 11 is completed, the mesh insulation pad 12 and the installation surface of the battery module 11 and the lower box 13 are the same. fit.

Preferably, the mesh 121 on the mesh insulation pad 12 is a diamond-shaped hole. Those skilled in the art will understand that the mesh 121 may also be in other shapes such as a circle, a square, etc., which is not limited herein. The size of the multiple meshes 121 may be unequal or equal. Preferably, the size of the multiple meshes 121 is the same, so that the mold structure used in injection molding is simple and the production cost is reduced.

The above descriptions are only preferred embodiments of the application, and are not used to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

A battery pack includes a battery module, a mesh insulating pad and a lower box; the battery module is accommodated in the lower box, and the mesh insulating pad is arranged on the battery module and the lower box. Between the boxes.
The battery pack according to claim 1, wherein the mesh insulating pad has a plurality of mesh holes.
The battery pack of claim 2, wherein the battery module and the lower case are fixed by an adhesive layer.
The battery pack according to claim 3, wherein the adhesive layer is distributed in the plurality of meshes.
The battery pack according to claim 4, wherein the thickness of the glue layer is the same as the thickness of the mesh insulating pad.
The battery pack according to claim 2, wherein the battery module includes a plurality of battery cells;

The area of the mesh is greater than or equal to half of the bottom area of the single battery cell.
The battery pack according to claim 6, wherein the area of the mesh is smaller than or equal to the bottom area of the single battery cell.
The battery pack according to claim 6, wherein the battery unit comprises a rectangular parallelepiped casing and a cover plate covering the opening of the casing;

When installing the battery module to the lower box, the larger surface of the shell in the plane perpendicular to the cover plate is the installation surface of the battery module.
The battery pack according to any one of claims 1-8, wherein the material of the mesh insulation pad is polycarbonate.
The battery pack according to any one of claims 1-8, wherein the mesh holes on the mesh insulation pad are diamond-shaped holes.