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Safety battery
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A safety and battery technology, used in battery electrodes, secondary batteries, and secondary battery repair/maintenance, etc., can solve problems such as complex processes and achieve the effect of improving safety performance
Pending Publication Date: 2021-06-18
深圳得能能源科技有限公司
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Abstract
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Problems solved by technology
[0006] These conventional active and passive control methods can solve some safety problems, and require a variety of methods to effectively solve some safety problems, and the process is complex
Method used
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Embodiment 1
[0027] A safety battery of the present invention comprises a base material 1, the positive electrode slurry is coated on the outer surface of the base material 1 to form the positive electrode of the battery, and the negative electrode slurry is coated on the outer surface of the base material 1 to form the negative electrode of the battery, wherein the positive electrode slurry The material or the negative electrode slurry are mixed by the active agent A, the conductive agent B and the binder.
[0028] In the present invention, a safety additive is added to the positive electrode or the negative electrode of the battery, wherein the dosage of the safety additive K corresponds to 0.1-20% of the total amount of the positive electrode slurry or the negative electrode slurry.
[0029] The batteries described in the present invention may be batteries such as lithium ion batteries, lithium sulfur batteries, lithium air batteries, and solid state batteries.
Embodiment 2
[0031] The safety additive K in this embodiment is mixed in the positive electrode slurry or the negative electrode slurry, and is correspondingly coated on the outer surface of the substrate 1 together with the positive electrode slurry or the negative electrode slurry, such as figure 1 .
[0033] The production process is as follows, taking the positive pole piece as an example: use aluminum foil as the positive current collector of the battery, evenly coat the positive electrode slurry containing active agent, conductive agent, binder and safety additive on both sides of the aluminum foil, through cold pressing, die-cutting , slitting, assembled with positive pol...
Embodiment 3
[0035] The safety additive K in this embodiment is coated on the outer surface of the substrate 1 and forms a precoat J, and then the positive electrode slurry or negative electrode slurry is coated on the outer surface of the precoat, such as image 3 .
[0036] When an internal short circuit occurs, the active agent A and the current collector are peeled off or loosened by physical or chemical reactions, such as Figure 4 , cut off the current channel, block the electronic conductivity, hinder the further occurrence of failure and improve the safety performance.
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Abstract
The invention discloses a safety battery which comprises a base material. The outer surface of the base material is coated with a positive electrodeslurry or a negative electrodeslurry, a positive electrode or a negative electrode of the battery is correspondingly formed, a safety additive is added into the positive electrode or the negative electrode of the battery, and the use amount of the safety additive is correspondingly 0.1-20% of the use amount of the positive electrode slurry or the negative electrode slurry. The safety additive is made of a foaming agent material or an expansion material or a PTC material. When a short circuit occurs in the battery, the added safety additive enables an active agent and a current collector to be stripped and loosened or enables materials to be loosened through a physical or chemical reaction so that a current channel is cut off, electronic conductivity is blocked, further occurrence of failure is hindered, and the safety performance is improved.
Description
Technical field: [0001] The present invention relates to a safe battery. Background technique: [0002] When the battery is short-circuited or short-circuited internally or externally, a very high temperature will be generated through a large current at an extreme time, which will trigger a series of violent reactions, such as slight swelling and smoke, and severe combustion and explosion. and other security issues. Therefore, how to improve the safety performance of lithium-ion batteries is a hot topic in current research. [0003] At present, the methods to improve the safety of lithium-ion batteries are mainly active protection and passive protection. [0004] Active protection is generally: using the characteristics of shrinkage and closure of the heat-sensitive isolation film when overheating, blocking the lithiumion shuttle between the positive and negative materials; adding safety additives to the electrolyte, forming an insulating layer on the surface of the posit...
Claims
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Application Information
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