High-safety battery and battery system

Abstract

The utility model relates to the technical field of batteries, in particular to a high-safety battery and a battery system.The high-safety battery comprises a shell, a battery cell is arranged in the shell, a liquid release valve is arranged at the bottom of the shell, an electrolyte flow channel is formed in the bottom face in the shell and connected with one end of the liquid release valve, and the other end of the liquid release valve is connected with the battery cell. And the other end of the liquid discharge valve is connected with a pipeline, so that the electrolyte in the shell can be discharged through the electrolyte flow channel and the liquid discharge valve. According to the utility model, the problem that the electrolyte is blocked by a diaphragm, a gasket and the like and is not circulated, so that the discharge efficiency is low or the electrolyte cannot be completely discharged is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, concretely relates to a high safety battery and battery system. BACKGROUND

[0002] With energy storage battery bigger and bigger, the energy inside the energy storage battery is bigger and bigger, and the safety performance of the energy storage battery also causes people's worry more and more. Electrolyte is an important participant of battery safety problem, electrolyte will have a large number of side reactions with battery materials to produce flammable gas and heat, and electrolyte will produce a large amount of flammable electrolyte vapor at high temperature, in addition, a large amount of electrolyte is sprayed out with high-temperature high-pressure gas after the valve of the battery is opened, which will cause the failure of adjacent batteries.

[0003] The Chinese invention patent application with the application publication number CN113745749A discloses a kind of anti-explosion lithium ion power battery system and its control method, including lithium ion power battery group of single battery composition, lithium ion power battery group is installed in battery module shell, the top of each single battery is equipped with outward safety valve, bottom is equipped with inward safety valve, the inward safety valve is connected with pipeline, each pipeline is gathered to pipeline integrated device, then through pressure pump connection to waste electrolyte storage tank, waste electrolyte storage tank is equipped with drain valve, pressure pump is equipped with exhaust pipe valve door.This anti-explosion lithium ion power battery system extracts flue gas and part of electrolyte of battery by pressure pump and outward safety valve, then utilizes inward safety valve to extract participating electrolyte, to avoid the reaction of electrolyte. However, the inward safety valve of the single battery is arranged on the side, and the gasket and redundant diaphragm in the single battery can hinder the discharge of electrolyte, resulting in low discharge efficiency or inability to discharge completely. SUMMARY

[0004] The purpose of the utility model is to provide a high safety battery and battery system to avoid the problem of low discharge efficiency or inability to discharge completely caused by the blockage of electrolyte by diaphragm, gasket and the like.

[0005] To solve the above technical problems, in the first aspect, the utility model provides a kind of high safety battery, including shell, the shell is arranged in electric core, the shell bottom is provided with liquid release valve, the bottom surface of the shell interior is equipped with electrolyte flow channel, the electrolyte flow channel is connected with one end of the liquid release valve, the other end of the liquid release valve is connected with pipeline, so that the electrolyte in the shell can be discharged through the electrolyte flow channel and the liquid release valve.

[0006] In some embodiments, the liquid release valve includes a one-way valve, and the electrolyte in the shell is discharged from the liquid release valve to the pipeline under high pressure in the shell or low pressure in the pipeline.

[0007] In some embodiments, the drain valve is provided with one or more, when the drain valve is provided with one, the drain valve is arranged at the center of the bottom of the shell, the electrolyte flow channel is provided with multiple, one end of the multiple electrolyte flow channels is connected with the drain valve, and the other end of the multiple electrolyte flow channels extends to the inner wall of the shell.

[0008] In some embodiments, the multiple electrolyte flow channels are arranged in parallel.

[0009] In some embodiments, a drain pipe is arranged between the drain valve and the pipeline, and the drain valve is connected with the pipeline through the drain pipe.

[0010] In the second aspect, the utility model provides a kind of battery system, including battery management system and air pump, the air pump is arranged on the pipeline, the battery management system is respectively connected with the air pump and the high safety battery, and the battery management system is used to control the opening of air pump according to the temperature signal and / or voltage signal of the high safety battery, and the air pump is used to actively extract electrolyte in the high safety battery.

[0011] In some embodiments, the high safety battery is provided with at least one group, each group of the high safety battery is provided with multiple, the pipeline includes main pipeline and multiple branch pipelines arranged on the main pipeline, and the drain valve of multiple high safety batteries is connected with multiple branch pipelines one by one.

[0012] In some embodiments, the drain pipe and the branch pipeline are connected through threaded joint or plug-in joint.

[0013] In some embodiments, a box body is included, multiple partitions are arranged in the box body, multiple partitions form at least one battery mounting position, a group of high safety batteries are fixed on the battery mounting position, the partition and the high safety battery are close, a pressure sensor is arranged between the partition and the high safety battery, the pressure sensor is connected with the battery management system, and the battery management system is used to control the opening of air pump according to the temperature signal and / or voltage signal and / or pressure signal of the high safety battery.

[0014] In some embodiments, the pipeline is arranged at the bottom of the box body, a support is arranged between the pipeline and the high safety battery, and the high safety battery is fixed on the support.

[0015] The utility model has the advantages that:

[0016] 1. This utility model provides an electrolyte flow channel on the bottom surface inside the housing, with a drain valve located at the bottom of the housing. This allows the electrolyte to flow into the electrolyte flow channel and then out of the housing through the drain valve, avoiding the problem of low discharge efficiency or incomplete discharge caused by the electrolyte being blocked by diaphragms, gaskets, etc.

[0017] 2. The drain valve of this utility model includes a one-way valve, which prevents electrolyte backflow, and the electrolyte can be discharged from the shell when the gas pressure inside the shell is high or the gas pressure inside the pipe is low.

[0018] 3. The drain valve of this utility model can be set in one or more as needed. When a drain valve is set, the drain valve is arranged at the center of the bottom of the shell, which is conducive to the rapid discharge of electrolyte.

[0019] 4. The battery system of this utility model is equipped with a battery management system and a vacuum pump. The vacuum pump can draw negative pressure into the pipeline, so that the battery management system can control the vacuum pump to actively extract the electrolyte from the casing according to the battery temperature and voltage, forming an active safety management system, which further improves the safety of the battery system.

[0020] 5. This utility model allows one pipe to correspond to multiple high-safety batteries, enabling unified management of multiple high-safety batteries and reducing the risk of battery thermal diffusion.

[0021] 6. By incorporating a pressure sensor, this utility model enables the battery management system to control the air pump based on the pressure generated by battery expansion, further enhancing the safety of the battery system. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the internal structure of the high-safety battery of this utility model and its connection with the pipeline.

[0023] Figure 2 This is a schematic diagram of the bottom structure of the high-safety battery of this utility model;

[0024] Figure 3 This is a schematic diagram of the battery system of this utility model.

[0025] Reference numerals: 1-Housing; 2-Drain valve; 3-Electrolyte flow channel; 4-Pipe; 41-Main pipe; 42-Branch pipe; 5-Drain pipe; 6-Battery management system; 7-Air pump; 8-Baffle; 9-Pressure sensor. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0027] This utility model provides a high-safety battery, including a casing 1, which is square in shape, and a battery cell disposed inside the casing 1, such as... Figure 1 As shown, three high-safety batteries are illustrated. Only the bottom of the casing 1 of one of the high-safety batteries is shown. A drain valve 2 is provided at the bottom of the casing 1. An electrolyte flow channel 3 is opened on the bottom surface inside the casing 1. The electrolyte flow channel 3 is connected to one end of the drain valve 2, and the other end of the drain valve 2 is connected to a pipe 4, so that the electrolyte in the casing 1 can be discharged through the electrolyte flow channel 3 and the drain valve 2.

[0028] Understandably, by setting a drain valve 2 and an electrolyte flow channel 3 at the bottom of the shell 1, the electrolyte is not affected by the diaphragm, gaskets and other structures inside the shell 1. Under the action of air pressure and gravity, it flows into the electrolyte flow channel 3, then flows through the electrolyte flow channel 3 to the drain valve 2, and finally flows into the pipe 4 through the drain valve 2 to be discharged. This avoids the problem of low discharge efficiency or incomplete discharge caused by the electrolyte being blocked by the diaphragm, gaskets and other structures.

[0029] In some embodiments, the drain valve 2 includes a one-way valve, through which electrolyte in the housing 1 is discharged from the drain valve 2 to the pipe 4 under high pressure in the housing 1 or low pressure in the pipe 4.

[0030] Understandably, since the drain valve 2 includes a one-way valve, when high-temperature and high-pressure gas is generated inside the casing 1, the one-way valve opens under high-pressure conditions, allowing the electrolyte to flow rapidly into the pipe 4, thereby reducing the reaction intensity of battery failure and reducing flammable materials; in addition, the vacuum pump 7 can draw negative pressure into the pipe 4, making the gas pressure inside the casing 1 much greater than that inside the pipe 4, which also allows the electrolyte to flow rapidly into the pipe 4. This is an active safety management method that can drain all the electrolyte before the battery thermal runaway occurs, avoiding the risk of battery thermal diffusion.

[0031] In some embodiments, one or more drain valves 2 are provided. When only one drain valve 2 is provided, such as... Figure 1 As shown, the drain valve 2 is located at the center of the bottom of the housing 1. Multiple electrolyte channels 3 are provided, with one end connected to the drain valve 2 and the other end extending towards the inner wall of the housing 1. By arranging the drain valve 2 at the center of the bottom of the housing 1, rapid electrolyte discharge is facilitated, and the extension of the electrolyte channels 3 towards the inner wall of the housing 1 helps reduce electrolyte residue.

[0032] In some embodiments, multiple electrolyte channels 3 are arranged in parallel.

[0033] In some embodiments, such as Figure 2 As shown, a drain pipe 5 is installed between the drain valve 2 and the pipe 4, and the drain valve 2 is connected to the pipe 4 through the drain pipe 5.

[0034] As Figure 3 shown, the utility model also provides a battery system, including battery management system 6 and air pump 7, air pump 7 sets up on pipeline 4, battery management system 6 is connected with air pump 7 and high safety battery respectively, battery management system 6 is connected with high safety battery through CCS component, can monitor the temperature and voltage of high safety battery, battery management system 6 controls the opening of air pump 7 according to the temperature signal and / or voltage signal of high safety battery, air pump 7 is used to draw negative pressure for pipeline 4, thereby actively draws the electrolyte in high safety battery, forms active safety management system, further improves the safety of battery system.

[0035] In some embodiments, high safety battery is provided at least in a group, and each group of high safety battery is provided with multiple high safety batteries. Figure 1 As shown, pipeline 4 includes a main pipeline 41 and a plurality of branch pipelines 42 arranged on the main pipeline 41, and the liquid leakage valves 2 of the plurality of high safety batteries are connected one by one with the plurality of branch pipelines 42, thereby achieving unified management of the plurality of high safety batteries and reducing the risk of battery thermal diffusion.

[0036] In some embodiments, the liquid leakage pipe 5 is connected with the branch pipeline 42 through a threaded joint or a plug-in joint, and the threaded joint and the plug-in joint are both existing mature technologies.

[0037] In some embodiments, a box body is provided, as shown. Figure 3 The box body is provided with a plurality of partitions 8, and the plurality of partitions 8 form at least one battery mounting position, and a group of high safety batteries are fixed on the battery mounting position, the partitions 8 and the high safety batteries are in close contact, and a pressure sensor 9 is arranged between the partitions 8 and the high safety batteries, the pressure sensor 9 is connected with the battery management system 6, and the battery management system 6 is used to control the opening of the air pump 7 according to the temperature signal and / or voltage signal and / or pressure signal of the high safety battery.

[0038] In some embodiments, the pipeline 4 is arranged at the bottom of the box body, a support is arranged between the pipeline 4 and the high safety battery, and the high safety battery is fixed on the support, thereby avoiding interference between the pipeline 4 and the high safety battery.

[0039] The working principle of the battery system is as follows: when the battery fails, there will be abnormal signals such as temperature, voltage and pressure, the battery management system 6 (BMS) can receive the temperature, voltage and pressure signals of the battery and process them, and then issues a start command to the air pump 7, the air pump 7 starts to pump air to the high safety batteries integrated on the same pipeline 4, the negative pressure state of the pipeline 4 can open the liquid leakage valve 2, thereby discharging the electrolyte of the high safety batteries integrated on the same pipeline 4, thereby reducing the failure strength of the battery and preventing the remaining batteries from failing due to thermal diffusion.

[0040] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A high safety battery, characterized by: The application relates to a high-safety battery, which comprises a shell (1) provided with an electric core, a liquid leakage valve (2) arranged at the bottom of the shell (1), and an electrolyte flow channel (3) arranged on the bottom surface of the shell (1) and connected with one end of the liquid leakage valve (2), and the other end of the liquid leakage valve (2) is connected with a pipeline (4), so that the electrolyte in the shell (1) can be discharged through the electrolyte flow channel (3) and the liquid leakage valve (2).

2. The high safety battery of claim 1, wherein: The liquid leakage valve (2) is a one-way valve, and the electrolyte in the shell (1) is discharged from the liquid leakage valve (2) to the pipeline (4) under high air pressure in the shell (1) or low air pressure in the pipeline (4).

3. The high safety battery according to claim 1 or 2, characterized in that: The liquid leakage valve (2) is provided with one or more liquid leakage valves (2), when the liquid leakage valve (2) is provided with one liquid leakage valve (2), the liquid leakage valve (2) is arranged at the center of the bottom of the shell (1), and a plurality of electrolyte flow channels (3) are provided, one end of the plurality of electrolyte flow channels (3) is connected with the liquid leakage valve (2), and the other end of the plurality of electrolyte flow channels (3) extends to the inner wall of the shell (1).

4. The high safety battery according to claim 3, characterized in that: The plurality of electrolyte flow channels (3) are arranged in parallel.

5. The high safety battery according to claim 1 or 2, characterized by: A liquid leakage pipe (5) is arranged between the liquid leakage valve (2) and the pipeline (4), and the liquid leakage valve (2) is connected with the pipeline (4) through the liquid leakage pipe (5).

6. A battery system of a high safety battery according to any one of claims 1 to 5, characterized by: The application further relates to a battery management system (6) and an air extraction pump (7), the air extraction pump (7) is arranged on the pipeline (4), the battery management system (6) is connected with the air extraction pump (7) and the high-safety battery respectively, the battery management system (6) is used for controlling the opening of the air extraction pump (7) according to the temperature signal and / or voltage signal of the high-safety battery, and the air extraction pump (7) is used for actively extracting the electrolyte in the high-safety battery.

7. The battery system of claim 6, wherein: The high-safety battery is provided with at least one group, each group is provided with a plurality of high-safety batteries, the pipeline (4) comprises a main pipeline (41) and a plurality of branch pipelines (42) arranged on the main pipeline (41), and the liquid leakage valves (2) of the plurality of high-safety batteries are connected with the plurality of branch pipelines (42) one by one.

8. The battery system of claim 7, wherein: The liquid leakage pipe (5) and the branch pipeline (42) are connected through a threaded joint or a plug-in joint.

9. The battery system of claim 7, wherein: The application further relates to a box, a plurality of partitions (8) are arranged in the box, the plurality of partitions (8) form at least one battery mounting position, a group of high-safety batteries are fixed on the battery mounting position, the partition (8) and the high-safety battery are in close contact, a pressure sensor (9) is arranged between the partition (8) and the high-safety battery, the pressure sensor (9) is connected with the battery management system (6), and the battery management system (6) is used for controlling the opening of the air extraction pump (7) according to the temperature signal and / or voltage signal and / or pressure signal of the high-safety battery.

10. The battery system of claim 9, wherein: The pipeline (4) is arranged at the bottom of the box, a support is arranged between the pipeline (4) and the high-safety battery, and the high-safety battery is fixed on the support.

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