Constant-voltage lithium ion battery

Abstract

The utility model discloses a constant-voltage lithium ion battery which comprises a battery cell shell and is characterized in that overflow layers are arranged on two narrow edges of the battery cell shell, electrorheological layers are arranged on two large surfaces of the battery cell shell, and the overflow layers and the electrorheological layers are fixed through heat-conducting structural adhesive in an adhesive mode; the electrorheological layer is arranged on the large surface of the battery cell, the overflow layers are arranged on the narrow edges of the two sides of the battery cell and used for adjusting the content of the electrorheological layer in the circulation process, the battery structure has the advantage of a high-strength structure of the hard-shell battery cell, expansion of the battery can be actively adapted through program setting associated with a battery SOC closed loop in the battery circulation process, and the battery performance is improved. Therefore, zero-strain and constant-pressure stable circulation of the single cells of the solid-state battery in the whole life cycle can be realized, the lithium ion battery module is not easy to deform or crack due to collision of the single cells, and the safety is high.

Description

Technical Field

[0001] The utility model relates to the field of lithium - ion batteries, in particular to a constant - voltage lithium - ion battery. Background Art

[0002] In actual use, lithium - ion batteries are usually assembled into battery modules for use. A battery module is a grouped battery composed of several single - cell batteries and related installation structure parts. A battery module with a standard structure has multiple single - cell batteries. When the battery module is charged and discharged, the single - cell batteries will bulge to varying degrees.

[0003] When the existing lithium - ion batteries are charged and discharged, lithium ions in the battery core escape from the positive electrode to be deposited on the negative electrode. The newly deposited lithium ions have no pores to accommodate them and can only expand on the battery, which severely restricts the application of lithium - ion batteries. The lithium - ion battery module is prone to deformation or cracking due to the collision of single - cell batteries, and has poor safety.

[0004] Therefore, we propose a constant - voltage lithium - ion battery to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to solve the defects existing in the prior art, and to propose a constant - voltage lithium - ion battery.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A constant - voltage lithium - ion battery includes a battery - core housing. Overflow layers are provided on both narrow sides of the battery - core housing, and electrorheological layers are provided on both large surfaces of the battery - core housing. The overflow layers and the electrorheological layers are adhesively fixed by thermally conductive structural adhesives.

[0008] Further preferably, a positive - electrode tab is provided at one end of the battery - core housing, and a negative - electrode tab is provided at the other end of the battery - core housing opposite to the positive - electrode tab.

[0009] Further preferably, a wound core is provided inside the battery - core housing. A positive electrode is provided at one end of the wound core, and a negative electrode is provided at the other end of the wound core opposite to the positive electrode.

[0010] Further preferably, the positive - electrode tab penetrates through the battery - core housing and is connected to the positive electrode, and the negative - electrode tab penetrates through the battery - core housing and is connected to the negative electrode.

[0011] Further preferably, the overflow layers are symmetrically arranged with the battery - core housing as the center, and the horizontal area of the overflow layers is the same as that of the narrow sides of the battery - core housing.

[0012] Further preferably, the electrorheological layers are symmetrically arranged with the battery - core housing as the center, and the horizontal area of the electrorheological layers is the same as that of the large surfaces of the battery - core housing.

[0013] The beneficial effects of the present utility model compared with the prior art are as follows:

[0014] A current-variable layer is provided on the large surface of the battery cell, and overflow layers are provided on the two narrow sides of the battery cell to adjust the content of the current-variable layer during the circulation process. This battery structure has the advantages of the high-strength structure of the hard-shell battery cell and can actively adapt to the expansion of the battery through a program setting associated with the battery SOC closed-loop during the battery circulation process. Therefore, zero strain and constant pressure stable circulation can be achieved for the solid-state battery single cell throughout its life cycle. The lithium-ion battery module is not easily deformed or cracked due to the collision of the single cell, and has strong safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of a constant-voltage lithium-ion battery proposed by the present utility model;

[0016] Figure 2 It is an internal structural diagram of a constant-voltage lithium-ion battery proposed by the present utility model.

[0017] In the figure: 1. Battery cell housing; 2. Overflow layer; 3. Current-variable layer; 4. Positive terminal ear; 5. Negative terminal ear; 6. Wound core; 7. Positive electrode; 8. Negative electrode. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0019] Referring to Figure 1 , a constant-voltage lithium-ion battery includes a battery cell housing 1. Overflow layers 2 are provided on both narrow sides of the battery cell housing 1, and current-variable layers 3 are provided on both large surfaces of the battery cell housing 1. The design of the present invention uses a five-sided hard shell (such as various hard materials like aluminum shell, steel shell, etc.) to limit the expansion of the solid-state battery to the top surface, and a layer of current-variable liquid layer is designed on the top surface of the battery. This current-variable liquid layer can adapt to the expansion and contraction of the battery during the circulation process according to the program;

[0020] The current-variable liquid in this layer can achieve the characteristic of continuously adjustable hardness and softness under the action of an electric field. This current-variable liquid is based on the interaction generated by particle polarization. After an appropriate voltage is applied to the suspension, it is found that the liquid immediately becomes a solid, and when the voltage is cancelled, the solid will quickly become a liquid again. The time for this phase change is only a few milliseconds, and the strength of the solid will increase with the increase of the applied voltage. The phase change and solid-state strength can be controlled by the presence and magnitude of the voltage;

[0021] A current-variable layer 3 is provided on the large surface of the battery cell, and overflow layers 2 are provided on the narrow sides on both sides of the battery cell to adjust the content of the current-variable layer 3 during the circulation process. This battery structure has the advantages of the high-strength structure of a hard-shell battery cell and can actively adapt to the expansion of the battery through a program setting that is closed-loop associated with the battery SOC during the battery circulation process. Thus, zero strain and constant pressure stable circulation can be achieved for the solid-state battery single cell throughout its entire life cycle. The lithium-ion battery module is not easily deformed or cracked due to the collision of single cells, and has strong safety performance.

[0022] Both the overflow layer 2 and the current-variable layer 3 are adhesively fixed through a thermally conductive structural adhesive. While fixing the overflow layer 2 and the current-variable layer 3, the thermally conductive structural adhesive can also conduct heat effectively, dissipate heat effectively, and prevent potential safety hazards caused by overheating of the battery cell.

[0023] Refer to Figure 2 , one end of the battery cell housing 1 is provided with a positive electrode tab 4, and the other end of the battery cell housing 1 opposite to the positive electrode tab 4 is provided with a negative electrode tab 5. By connecting to the acquisition row through the positive electrode tab 4 and the negative electrode tab 5 respectively, the charge and discharge cycle of the battery can be realized.

[0024] A wound core 6 is provided inside the battery cell housing 1. At the same time, an electrolyte is provided inside the battery cell housing 1. The electrolyte contacts the wound core 6. One end of the wound core 6 is provided with a positive electrode 7, and the other end of the wound core 6 opposite to the positive electrode 7 is provided with a negative electrode 8. Lithium ions move between the positive electrode 7 and the negative electrode 8 to generate a potential difference in the battery cell, thereby realizing the charge and discharge of the battery;

[0025] The positive electrode tab 4 penetrates through the battery cell housing 1 and is connected to the positive electrode 7, and the negative electrode tab 5 penetrates through the battery cell housing 1 and is connected to the negative electrode 8. By connecting to the electrode tabs through the positive electrode tab 4 and the negative electrode tab 5 respectively, the charge and discharge cycle of the battery can be realized. The intersections of the positive electrode tab 4 and the negative electrode tab 5 with the battery cell housing 1 are sealed to prevent liquid leakage.

[0026] The overflow layer 2 is symmetrically arranged with the battery cell housing 1 as the center. The shapes and weights of the narrow sides of the battery cell housing 1 are the same, so that the battery cell housing 1 can be more stable. The horizontal area of the overflow layer 2 is the same as that of the narrow side of the battery cell housing 1, so that the overflow layer 2 can completely cover the narrow side of the battery cell housing 1, and can more effectively prevent the battery cell from swelling.

[0027] The current-variable layer 3 is symmetrically arranged with the battery cell housing 1 as the center. The shapes and weights of the large surfaces of the battery cell housing 1 are the same, so that the battery cell housing 1 can be more stable. The horizontal area of the overflow layer 2 is the same as that of the large surface of the battery cell housing 1, so that the overflow layer 2 can completely cover the large surface of the battery cell housing 1, and can more effectively prevent the battery cell from swelling.

Claims

1. A constant voltage lithium ion battery, comprising a battery cell housing, characterized in that: Overflow layers are provided on both narrow sides of the battery cell shell, and electrorheological layers are provided on both large surfaces of the battery cell shell. The overflow layer and the electrorheological layer are both glued and fixed by means of a thermally conductive structural adhesive. A positive pole ear is provided at one end of the battery cell shell, and a negative pole ear is provided at the other end of the battery cell shell opposite to the positive pole ear. A winding core is provided inside the battery cell shell, and a positive pole is provided at one end of the winding core, and a negative pole is provided at the other end of the winding core opposite to the positive pole. The positive pole ear penetrates the battery cell shell and is connected to the positive pole, and the negative pole ear penetrates the battery cell shell and is connected to the negative pole.

2. A constant voltage lithium ion battery according to claim 1, characterized in that: The overflow layer is symmetrically arranged with the battery cell shell as the center, and the horizontal area of ​​the overflow layer is consistent with the narrow side of the battery cell shell.

3. A constant voltage lithium ion battery according to claim 1, characterized in that: The electrorheological layers are symmetrically arranged with the battery shell as the center, and the overflow layer has the same horizontal area as the large surface of the battery shell.

Images