Device for injecting liquid into lithium ion battery

Abstract

The utility model relates to a device for injecting liquid into a lithium ion battery, which comprises a shell sleeved outside the lithium ion battery, and the inner wall of the shell is constructed into a slope shape. When liquid is injected into the blade battery, the blade battery is inserted into the shell, and the shell forms a gradient structure, so that on one hand, the blade battery is conveniently inserted, and on the other hand, the bottom of the aluminum shell of the battery is bound by the shell, and when liquid is injected from the liquid injection port of the battery, electrolyte firstly flows into the bottom of the battery core under the action of gravity; the bottom of the battery core aluminum shell is bound, so that the battery core aluminum shell cannot deform in the liquid injection process, and the flatness of the plane of the battery core aluminum shell is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of battery liquid injection, in particular to a device for lithium ion battery liquid injection. Background Art

[0002] The aluminum shell commonly used in blade batteries is generally a shell that is bent after laser or high-frequency welding. Due to the requirement to maximize capacity, the thickness of the shell material has been continuously reduced. The current thinnest aluminum plate thickness is 0.35mm, which leads to low overall shell strength. The length of the blade battery is longer than that of the traditional VDA size battery cell. When the battery cell is filled with liquid under a controlled vacuum, the electrolyte is first deposited at the bottom of the battery cell due to gravity, causing the aluminum shell at the bottom of the battery cell to deform easily when the battery cell is filled. This is especially true for thin aluminum shell batteries, making it difficult to control the flatness of the battery. Utility Model Content

[0003] Based on this, it is necessary to provide a device for injecting lithium-ion batteries to address the technical problem that the current blade battery is longer than the traditional VDA size battery cell. When the battery cell is injected with liquid under a controlled vacuum, the electrolyte is first deposited at the bottom of the battery cell due to gravity, resulting in the aluminum shell at the bottom of the battery cell being easily deformed when the battery cell is injected. This is especially true for thin aluminum shell batteries, which makes the flatness of the battery difficult to control.

[0004] The utility model provides a device for injecting liquid into a lithium ion battery, which comprises a shell sleeved on the outside of the lithium ion battery, and the inner wall of the shell is constructed in a slope shape.

[0005] When the blade battery is injected with liquid, the utility model first inserts the blade battery into the shell. Since the shell forms a sloped structure, on the one hand, it is convenient to insert the blade battery. On the other hand, the bottom of the battery aluminum shell will be restrained by the sloped inner wall of the shell. When injecting liquid from the battery injection port, under the action of gravity, the electrolyte first flows into the bottom of the battery cell. Since the bottom of the battery cell shell is restrained, it will not be deformed during the injection process, thereby maintaining the flatness of the battery aluminum shell plane.

[0006] As a further improvement of the above solution of the utility model, the slope of the inner wall of the shell is 0°-10°.

[0007] As a further improvement of the above-mentioned scheme of the utility model, the outer shell includes a shell and an elastic buffer layer arranged on the inner wall of the shell. An opening for inserting the lithium-ion battery is opened at the top of the shell. From the bottom end of the shell to the top end of the shell, the thickness of the elastic buffer layer gradually decreases to form the slope shape.

[0008] As a further improvement of the above solution of the utility model, the shell has a rectangular structure, and the interior of the shell is constructed into an inner cavity that is compatible with the lithium-ion battery.

[0009] As a further improvement of the above solution of the utility model, it also includes a bottom plate, and the shell is installed on the bottom plate.

[0010] As a further improvement of the above solution of the utility model, there are multiple shells, and the multiple shells are distributed in an array on the bottom plate.

[0011] As a further improvement of the above solution of the utility model, the height of the shell is 300mm-960mm.

[0012] As a further improvement of the above solution of the utility model, the elastic buffer layer is bonded to the inner wall of the shell.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] When the blade battery is injected with liquid, the utility model inserts the blade battery into the shell first. Since the outer shell forms a sloped structure, on the one hand, it is convenient to insert the blade battery. On the other hand, the bottom of the battery aluminum shell will be restrained by the sloped inner wall of the outer shell. When injecting liquid from the battery injection port, under the action of gravity, the electrolyte first flows into the bottom of the battery cell. Since the bottom of the battery cell aluminum shell is restrained, it will not be deformed during the injection process, thereby maintaining the flatness of the battery aluminum shell plane. At the same time, it can strengthen the limit fixation of the battery, reduce the shaking amplitude of the lithium-ion battery in the outer shell, and ensure the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a device for injecting liquid into a lithium-ion battery proposed in an embodiment of the utility model;

[0016] Figure 2 A schematic diagram of the structure of a housing in a device for injecting liquid into a lithium-ion battery proposed in an embodiment of the utility model;

[0017] Figure 3 for Figure 2 Middle AA section view;

[0018] Figure 4 for Figure 3 The enlarged schematic diagram at A in the middle;

[0019] Figure 5 for Figure 3 Enlarged schematic diagram of point B in the middle.

[0020] Figure numerals: 1, outer shell; 101, shell; 102, elastic buffer layer; 2, lithium-ion battery; 3, bottom plate. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0024] This embodiment aims to solve the technical problem that the length of the current blade battery is longer than the traditional VDA size battery cell. When the battery cell is filled with liquid under controlled vacuum, the electrolyte is first deposited at the bottom of the battery cell due to gravity, which causes the aluminum shell at the bottom of the battery cell to be easily deformed when the battery cell is filled with liquid. The impact is more obvious for the thin aluminum shell battery cell, which makes the flatness of the battery difficult to control. A device for filling lithium-ion batteries is provided, which can maintain the flatness of the aluminum shell plane at the lower end of the battery cell during injection, so as to prevent the battery cell shell from deforming during injection.

[0025] Reference Figure 1-Figure 5 The device for lithium-ion battery injection in this embodiment is used to assist the lithium-ion battery 2 in injecting liquid, and includes a plurality of shells 1 and a bottom plate 3, wherein the plurality of shells are distributed in an array on the bottom plate 3. Each shell 1 includes a shell 101 and an elastic buffer layer 102.

[0026] The housing 101 is in a rectangular structure. An opening for inserting the lithium-ion battery 2 is provided at the top of the housing 101 , and the interior of the housing 101 is configured as an inner cavity adapted to the lithium-ion battery 2 .

[0027] The elastic buffer layer 102 is bonded to the inner wall of the shell 101, and the thickness of the elastic buffer layer 102 gradually decreases from the bottom end to the top end of the shell 101, thereby forming a slope-shaped structure on the inner wall of the shell 101, and the angle of the slope is 0°-10°. In this embodiment, the elastic buffer layer 102 can be made of foam with pores and can be compressed.

[0028] Through the above structural setting, when the blade battery is injected, the blade battery is first inserted into the shell 101. Since the shell 101 forms a sloped structure through the elastic buffer layer 102, on the one hand, it is convenient to insert the blade battery and the elastic buffer layer 102 will not cause damage to the blade battery 2. On the other hand, the bottom of the battery aluminum shell will squeeze the elastic buffer layer 102. The elastic buffer layer 102 with a larger bottom thickness is compressed to restrain the bottom of the battery 2, and then the battery is injected from the injection port. Under the action of gravity, the electrolyte first flows into the bottom of the battery cell. The bottom of the battery cell aluminum shell is restrained by the elastic buffer layer 102 and will not be deformed during the injection process, thereby maintaining the flatness of the battery aluminum shell plane.

[0029] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A device for injecting liquid into a lithium-ion battery, characterized in that: The invention comprises a housing (1) which is mounted on the outside of a lithium-ion battery (2); the inner wall of the housing (1) is configured to be sloped.

2. The device for lithium-ion battery injection according to claim 1, characterized in that: The slope of the inner wall of the outer shell (1) is 0°-10°.

3. The device for lithium-ion battery injection according to claim 1, characterized in that: The housing (1) comprises a housing (101) and an elastic buffer layer (102) arranged on the inner wall of the housing (101); an opening for inserting a lithium-ion battery (2) is provided at the top of the housing (101); and the thickness of the elastic buffer layer (102) gradually decreases from the bottom of the housing (101) to the top of the housing (101) to form the slope shape.

4. The device for lithium-ion battery injection according to claim 3, characterized in that: The housing (101) is of a rectangular structure, and the interior of the housing (101) is configured as an inner cavity adapted to the lithium-ion battery (2).

5. The device for lithium-ion battery injection according to claim 1, characterized in that: It also includes a base plate (3), on which the housing (1) is mounted.

6. The device for injecting liquid into a lithium-ion battery according to claim 5, characterized in that: There are multiple shells (1), and the multiple shells (1) are distributed in an array on the bottom plate (3).

7. The device for lithium-ion battery injection according to claim 1, characterized in that: The height of the housing (1) is 300 mm-960 mm.

8. The device for lithium-ion battery injection according to claim 3, characterized in that: The elastic buffer layer (102) is bonded to the inner wall of the housing (101).

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