Lithium battery formation exhaust device
By using the exhaust device of the gas-liquid separation chamber seat and the detection controller, the problem of electrolyte being discharged along with gas during the lithium battery formation process is solved, realizing effective gas discharge and electrolyte reinjection, thereby improving the electrical performance of the lithium battery.
Patent Information
- Application Number
- CN202422743152.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-11-11
AI Technical Summary
During the formation of lithium batteries, the electrolyte is discharged along with the side reaction gases, which affects the battery performance.
An exhaust device employing a gas-liquid separation chamber seat and a detection controller separates gas and electrolyte through the gas-liquid separation chamber and exhaust channel. The opening and closing of the exhaust valve is controlled by a float component and a detection controller to achieve gas accumulation and electrolyte reinjection.
It effectively reduces electrolyte loss, maintains consistent electrolyte levels, and ensures lithium battery performance.
Smart Images
Figure CN223665510U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of batteries, in particular to a lithium battery formation exhaust device. BACKGROUND
[0002] In manufacturing, a lithium ion battery needs to complete the first charge-discharge process of the battery, also known as formation or initial charging. Electrochemical reactions occur in the positive and negative electrode materials inside the battery, and a small amount of irreversible consumption occurs in the electrode materials, electrolyte and lithium ions. Gas production during lithium battery formation is one of the phenomena of complex electrochemical reactions, which includes redox reactions of electrolyte, decomposition of residual moisture, mutual influence of more complex redox reactions, etc. These side reaction gases need to be discharged to avoid negative effects on battery performance. In the manufacturing process using open formation, heat is generated during the charge-discharge process of the battery, and certain thermal expansion causes the electrolyte to be squeezed out, so that the electrolyte in the battery is also discharged at the same time as the gas is discharged. However, the loss of electrolyte will affect the performance of the battery. CONTENT OF THE UTILITY MODEL
[0003] The application provides a lithium battery formation exhaust device to solve the technical problem that in the prior art, electrolyte is discharged together with side reaction gas during the formation process of a lithium battery, affecting the performance of the battery.
[0004] The application provides a lithium battery formation exhaust device, which comprises:
[0005] A gas-liquid separation cavity seat is internally formed with a gas-liquid cavity channel, a float member is arranged in the gas-liquid cavity channel, the gas-liquid cavity channel has a gas-liquid inlet end and a gas outlet end located above the gas-liquid inlet end, and the gas-liquid inlet end is in communication with a liquid injection hole of a lithium battery.
[0006] An exhaust valve is internally formed with an exhaust passage, the exhaust passage is in communication with the gas outlet end, and the exhaust valve is in electrical connection with the detection controller.
[0007] A detection controller is arranged, a detection end of the detection controller is used for detecting the position of the float member, and the detection controller is in electrical connection with the exhaust valve and controls the opening and closing of the exhaust valve.
[0008] Optionally, the exhaust valve is a normally open valve, the detection controller is in electrical connection with the normally open valve, and the detection controller controls the on-off of the circuit of the normally open valve.
[0009] Optionally, a first connecting piece is further arranged, the first connecting piece is internally formed with a first passage, the first connecting piece is in press-fit connection with the liquid injection hole, and the first passage is in communication with the gas-liquid inlet end and the liquid injection hole.
[0010] Optionally, the first connecting piece is a rubber sleeve connector, which is made of elastic material and is connected with a hose.
[0011] Optionally, the detection controller comprises a magnetic induction switch, and the float member comprises a magnetic ball float.
[0012] Optionally, the magnetic ball float is a hollow structure.
[0013] Optionally, an outer wall surface of the magnetic ball float is provided with a corrosion-resistant layer.
[0014] Optionally, the exhaust valve and the detection controller are detachably connected with the gas-liquid separation cavity seat.
[0015] Optionally, the second connecting piece is further connected with the exhaust valve, and a second channel is formed in the second connecting piece, one end of the second channel is communicated with the exhaust channel, and the other end of the second channel is used for connecting a gas collecting device.
[0016] Optionally, an exhaust liquid blocking piece is arranged in the end of the second connecting piece for communicating with the exhaust channel.
[0017] The above technical solution provided by the embodiments of the present application has the following advantages compared with the prior art.
[0018] The lithium battery formation exhaust device provided by the embodiments of the present application is characterized in that the gas-liquid channel of the gas-liquid separation cavity seat is communicated with the liquid injection hole, the gas and the electrolyte discharged from the lithium battery enter the gas-liquid channel, the gas in the gas-liquid channel directly enters the exhaust channel, the electrolyte discharged from the lithium battery remains in the gas-liquid channel, the float member floats on the liquid surface of the electrolyte, and the float member floats upward with the increase of the electrolyte in the gas-liquid channel. The position of the float member is detected by the detection controller, when the float member reaches a certain height, the detection controller controls the exhaust valve to be closed, the gas generated in the lithium battery formation process remains in the exhaust channel and the gas-liquid channel, and with the increase of the generated gas, the gas in the exhaust channel and the gas-liquid channel continuously suspends and gathers, the liquid level of the electrolyte in the gas-liquid channel decreases, and the electrolyte is re-injected into the lithium battery through the liquid injection hole; when the detection controller detects that the float member decreases to a certain height, the detection controller controls the exhaust valve to be opened, and the gas can be discharged through the exhaust channel.
[0019] The present application controls the closing of the exhaust valve, so that the byproduct gas in the lithium battery formation process has time to float and gather, keeps the gas floating and gathering above the electrolyte surface, and re-injects the electrolyte flowing out of the lithium battery into the lithium battery through the extrusion of the gas; by controlling the opening of the exhaust valve, the byproduct gas in the lithium battery formation process can be discharged through the exhaust passage. Therefore, the device can exhaust the gas generated in the lithium battery formation process, while also reducing the loss of electrolyte, ensuring higher consistency of the electrolyte retention amount of the lithium battery, and protecting the electrical performance of the lithium battery. BRIEF DESCRIPTION OF DRAWINGS
[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and serve to explain the principles of the present application together with the specification.
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without creative labor.
[0022] One or more embodiments are exemplarily illustrated by the pictures in the drawings corresponding thereto, which do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified. The drawings in the drawings do not constitute a proportional limitation.
[0023] Figure 1 A structural schematic diagram of the lithium battery formation exhaust device provided by the embodiments of the present application is shown.
[0024] Figure 2 A structural schematic diagram of the lithium battery formation exhaust device provided by the embodiments of the present application in cooperation with the lithium battery is shown.
[0025] Explanation of reference numerals:
[0026] 1, gas-liquid separation cavity seat; 11, gas-liquid cavity; 2, exhaust valve; 3, detection controller; 4, float member; 5, first connecting member; 6, second connecting member; 7, lithium battery; 71, liquid injection hole. DETAILED DESCRIPTION
[0027] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.
[0028] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the elements and settings of particular examples in the following are described. Of course, they are only examples and are not intended to limit the present application. Furthermore, the present application can repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and / or settings discussed.
[0029] For the purpose of description, spatial relative terms, such as "inner", "outer", "inward", "outward", "lower", "below", "upper", "above", "front", "back", and the like, can be used to describe the relative position relationship or movement of one element or feature to another element or feature as shown in the drawings. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over or the posture is changed or the movement state is changed, the directional indications will also change accordingly, for example: the element described as "below" or "under" other elements or features will be oriented as "above" or "over" other elements or features. Therefore, the example term "below" can include both upward and downward positions. The device can be additionally oriented (rotated by 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.
[0030] Please refer to Figure 1 The embodiments of the present application provide a lithium battery formation exhaust device, comprising:
[0031] A gas-liquid separation cavity seat 1, which is internally formed with a gas-liquid cavity 11, wherein a float member 4 is arranged in the gas-liquid cavity 11, the gas-liquid cavity 11 has a gas-liquid inlet end and a gas outlet end above the gas-liquid inlet end, and the gas-liquid inlet end is in communication with a liquid injection hole 71 of a lithium battery 7;
[0032] An exhaust valve 2, which is internally formed with an exhaust passage, and the exhaust passage is in communication with the gas outlet end; and
[0033] A detection controller 3 is arranged, a detection end of the detection controller 3 is used for detecting the position of the float member 4, and the detection controller 3 is electrically connected with the exhaust valve 2 to control the opening and closing of the exhaust valve 2.
[0034] In the opening formation manufacturing process of the lithium battery 7, the gas generated in the formation process of the lithium battery 7 is discharged from the liquid injection hole 71 of the lithium battery 7, at the same time, the heat generated in the charging and discharging process of the lithium battery 7 and the certain thermal expansion will cause the extrusion of the electrolyte to be discharged, so that the electrolyte will be discharged together with the gas. In this application, the gas-liquid cavity 11 of the gas-liquid separation cavity seat 1 is communicated with the liquid injection hole 71, the gas and electrolyte discharged from the lithium battery 7 will enter the gas-liquid cavity 11, the gas in the gas-liquid cavity 11 will directly enter the exhaust channel, and the electrolyte discharged from the lithium battery 7 will remain in the gas-liquid cavity 11, the float member 4 will float on the liquid surface of the electrolyte, and the float member 4 will float upward with the increase of the electrolyte in the gas-liquid cavity 11. The position of the float member 4 is detected by the detection controller 3, when the float member 4 reaches a certain height, the detection controller 3 controls the exhaust valve 2 to be closed, the gas generated in the formation process of the lithium battery 7 will remain in the exhaust channel and the gas-liquid cavity 11, and with the increase of the generated gas, the gas in the exhaust channel and the gas-liquid cavity 11 will continue to suspend and gather, the liquid level of the electrolyte in the gas-liquid cavity 11 will decrease, and the electrolyte will be re-injected into the lithium battery 7 through the liquid injection hole 71; when the detection controller 3 detects that the float member 4 decreases to a certain height, the detection controller 3 controls the exhaust valve 2 to be opened, and the gas can be discharged through the exhaust channel.
[0035] In this application, the closing of the exhaust valve 2 is controlled, so that the byproduct gas in the formation process of the lithium battery 7 has time to float and gather, the gas continues to suspend and gather above the liquid surface of the electrolyte, and the electrolyte flowing out of the lithium battery 7 is re-injected into the lithium battery 7 through the extrusion of the gas; the opening of the exhaust valve 2 is controlled, so that the byproduct gas in the formation process of the lithium battery 7 can be discharged through the exhaust channel. Therefore, the device can discharge the gas generated in the formation process of the lithium battery 7, and also can reduce the loss of the electrolyte, ensure that the consistency of the electrolyte retention amount of the lithium battery 7 is higher, and protect the electrical performance of the lithium battery 7.
[0036] Specifically, the gas-liquid separation cavity seat 1 is used, the gas-liquid cavity 11 is vertically arranged in the gas-liquid separation cavity seat 1 and connected to the upper side of the lithium battery 7, and the height of the gas outlet end is higher than that of the gas inlet end, so that the electrolyte flowing out of the lithium battery 7 can remain in the gas-liquid cavity 11, and the loss of the electrolyte is effectively avoided.
[0037] In order to facilitate connection, the lithium battery formation exhaust device further comprises a first connecting piece 5, a first channel is formed in the first connecting piece 5, the first connecting piece 5 is in pressure connection with the liquid injection hole 71, and the first channel communicates the gas-liquid inlet end and the liquid injection hole 71. The first connecting piece 5 is arranged to facilitate the connection of the liquid injection hole 71. The first connecting piece 5 can be a rubber sleeve connector, which is made of an elastic material and is in pressure connection or is connected with a hose in a pagoda shape. Of course, the first connecting piece 5 can be integrally formed with the gas-liquid separation cavity seat 1, and the first connecting piece 5 can also be detachably connected with the gas-liquid separation cavity seat 1, for example, the first connecting piece 5 is fastened to the gas-liquid separation cavity seat 1 by screwing or bonding.
[0038] In some embodiments of the present application, the exhaust valve 2 is a normally open valve, the detection controller 3 is electrically connected with the normally open valve, and the detection controller 3 controls the on-off of the circuit of the normally open valve. By arranging the normally open valve, the exhaust passage is in a communication state in a normal state, and the gas flowing through the gas-liquid separation cavity seat 1 can be stably discharged.
[0039] Optionally, the exhaust valve 2 and the gas-liquid separation cavity seat 1 can be fixedly connected by welding or detachably connected, for example, fastened together by screws or threads. Specifically, one end of the exhaust valve 2 and the gas outlet end of the gas-liquid separation cavity seat 1 are fastened together by threads.
[0040] In some embodiments of the present application, a second connecting piece 6 connected with the exhaust valve 2 is further included, a second channel is formed in the second connecting piece 6, one end of the second channel communicates with the exhaust passage, and the other end of the second channel is used to connect a gas collecting device. The gas collecting device collects the gas discharged from the exhaust valve 2.
[0041] The end of the second connecting piece 6 for communicating with the exhaust passage is provided with an exhaust liquid blocking piece. The exhaust liquid blocking piece can be a pagoda-shaped structure, a microporous membrane material, an ultrafiltration membrane, a waterproof and breathable membrane, etc. The exhaust liquid blocking piece can ensure the stable passage of gas and block the liquid to a certain extent. By arranging the exhaust liquid blocking piece, the stable flow of gas can be ensured, and the passage of electrolyte can be avoided, further avoiding the loss of electrolyte.
[0042] In some embodiments of the present application, the detection controller 3 comprises a magnetic induction switch, and the float member 4 comprises a magnetic ball float, and the magnetic induction switch is used to sense the magnetic ball float. Through the arrangement of the magnetic ball float and the magnetic induction switch, when the magnetic ball float floats to a certain height, the magnetic induction switch senses the magnetic ball float, the magnetic induction switch controls the normally open valve to be electrically connected, and after the normally open valve is powered on, it is switched from normally open to closed, at this time the whole exhaust pipeline is closed. The gas generated by the side reaction in the formation process continues to suspend and accumulate, the electrolyte level drops, the magnetic ball float sinks, and after the magnetic induction switch loses the magnetic triggering condition, the internal conduction is disconnected, the normally open valve loses power and returns to the normally open state, at this time the gas is discharged.
[0043] The magnetic ball float adaptively and dynamically follows the liquid level, thereby controlling the opening and closing of the exhaust valve 2, and the cyclic closing and opening of the valve realizes sufficient gas generation and exhaust, while avoiding the loss of electrolyte. It realizes automatic adaptation to the speed of gas generation, keeps the gas continuously accumulated above the liquid, and realizes active exhaust; the magnetic float is used to follow the change of the reaction liquid level in real time, the electromagnetic valve is directly connected with the electromagnetic switch, and no additional control system is needed.
[0044] Optionally, the magnetic ball float is a hollow structure, and through the arrangement of the hollow magnetic ball float, it can be ensured that the diameter of the magnetic ball float can be maximally matched with the gas-liquid cavity 11, and at the same time, it can be ensured that it can stably float above the liquid surface of the electrolyte.
[0045] Optionally, the outer wall surface of the magnetic ball float is provided with a corrosion-resistant layer, which can be PP (polypropylene), PTFE (polytetrafluoroethylene) or stainless steel material, and can resist immersion in electrolyte.
[0046] In some embodiments of the present application, the exhaust valve 2 and the detection controller 3 are detachably connected with the gas-liquid separation cavity seat 1. The exhaust valve 2 and the exhaust end of the gas-liquid separation cavity seat 1 are connected together through threaded fastening, and the detection controller 3 is fixed on the gas-liquid separation cavity seat 1 through screws or threads; the combination of the components of the device is simple and convenient, and the functional components are compactly combined together, which is convenient for maintenance and replacement.
[0047] In summary, when the electrolyte overflows during the formation process, the liquid level in the gas-liquid separation cavity seat 1 rises, the magnetic ball float floats up, at this time the normally open valve is in an open exhaust state, when the magnetic ball float continuously rises to the position of the magnetic induction switch, the magnetic induction switch is internally triggered to be connected. After the magnetic induction switch senses the magnetic ball float, the normally open valve is powered on and switched from normally open to closed, at this time the whole exhaust pipeline is closed. The gas generated by the side reaction in the formation process continues to suspend and accumulate, the electrolyte level drops, the magnetic ball float sinks, and after the magnetic induction switch loses the magnetic triggering condition, the internal conduction is disconnected, the normally open valve loses power and returns to the normally open state, at this time the gas is discharged.
[0048] By adopting the magnetic ball float to dynamically follow the change of electrolyte overflow, the exhaust valve 2 is controlled to be closed, so that the byproduct gas has time to float and gather, ensuring that the gas is continuously suspended and gathered above the liquid surface, and then the magnetic ball float is relied on to adaptively control the exhaust valve 2 to be opened, so that the cycle of closing and opening the valve is realized to achieve sufficient gas production and exhaust.
[0049] The present application provides a lithium battery formation exhaust device. The gas production in the formation process is a slow process, while the electrolyte overflow caused by the high temperature and expansion of the battery in the overcharge of charge and discharge is obviously faster, and the electrolyte is more likely to flow out of the exhaust pipe. The device can realize exhaust and reduce the loss of electrolyte, ensure the consistency of the electrolyte retention of the battery is higher, and protect the performance of the lithium battery 7.
[0050] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.
[0051] Although the terms first, second, third, and the like can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to differentiate one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms when used herein do not imply a sequence or order. Therefore, a first element, component, region, layer or section discussed below can be referred to as a second element, component, region, layer or section without departing from the teachings of the example embodiments.
[0052] The foregoing detailed description of the application has been presented for purposes of illustration and description. Various modifications and changes can be made to these embodiments without departing from the spirit and scope of the application. It is intended that the scope of the application should not be limited by the particular representative embodiments described above.
Claims
1. A lithium battery formation exhaust device, characterized by, The application relates to a lithium battery liquid injection device, which comprises the following parts: a gas-liquid separation cavity seat, which is internally formed with a gas-liquid cavity channel, wherein a float member is arranged in the gas-liquid cavity channel, the gas-liquid cavity channel has a gas-liquid inlet end and a gas outlet end located above the gas-liquid inlet end, and the gas-liquid inlet end is communicated with a liquid injection hole of a lithium battery; an exhaust valve, which is internally formed with an exhaust channel communicated with the gas outlet end; and a detection controller, which is used for detecting the position of the float member and is electrically connected with the exhaust valve to control the opening and closing of the exhaust valve. The exhaust valve is a normally open valve, the detection controller is electrically connected with the normally open valve, and the detection controller controls the on-off of the circuit of the normally open valve.
2. The lithium battery formation exhaust apparatus according to claim 1, wherein The device further comprises a first connecting member, which is internally formed with a first channel, the first connecting member is press-fit connected with the liquid injection hole, and the first channel is communicated with the gas-liquid inlet end and the liquid injection hole.
3. The lithium battery formation exhaust apparatus according to claim 1, wherein The first connecting member is a rubber sleeve connecting head, the rubber sleeve connecting head is made of elastic material and is press-fit or is in a pagoda shape and connected with a hose.
4. The lithium battery formation exhaust apparatus according to claim 3, wherein The detection controller comprises a magnetic induction switch, the float member comprises a magnetic ball float, and the magnetic induction switch is used for inducting the magnetic ball float.
5. The lithium battery formation exhaust apparatus according to claim 1, wherein The magnetic ball float is a hollow structure.
6. The lithium battery formation exhaust apparatus according to claim 5, wherein An anticorrosion layer is arranged on the outer wall surface of the magnetic ball float.
7. The lithium battery formation exhaust apparatus according to claim 5, wherein The exhaust valve and the detection controller are detachably connected with the gas-liquid separation cavity seat.
8. The lithium battery formation exhaust apparatus according to any one of claims 1 to 7, wherein The device further comprises a second connecting member connected with the exhaust valve, the second connecting member is internally formed with a second channel, one end of the second channel is communicated with the exhaust channel, and the other end of the second channel is used for connecting a gas collecting device.
9. The lithium battery formation exhaust apparatus according to any one of claims 1 to 7, wherein An exhaust liquid blocking member is arranged in the end of the second connecting member communicated with the exhaust channel.
10. The lithium battery formation exhaust apparatus according to claim 9, wherein,