Battery cell module exhausting and liquid supplementing system

Abstract

The utility model discloses a battery cell module exhausting and liquid supplementing system which comprises a plurality of battery cell main bodies, non-tab areas of the battery cell main bodies are provided with transmission ports, one ends of the transmission ports are communicated with inner cavities of the battery cell main bodies, the other ends of the transmission ports are connected with transmission pipelines in a sealing mode, and first valves are arranged on the transmission pipelines. The replacement bottle is fixedly erected at the top of the battery cell main body, standby electrolyte is preloaded in the replacement bottle, and an inner cavity of the replacement bottle is kept in a low negative pressure state, so that gas generated in the inner cavity of the battery cell main body can enter the replacement bottle, and the standby electrolyte is supplemented into the battery cell main body; a top cover is connected to the liquid supplementing opening in a sealed mode, and a second valve suitable for opening and closing the extraction opening is connected to the extraction opening in a sealed mode. The automatic liquid supplementing and exhausting device is simple in structure, can realize automatic liquid supplementing and exhausting in a short period, can realize long-term automatic liquid supplementing and exhausting under human intervention, and is higher in feasibility, so that the cycle service life of a battery cell is prolonged, and the use safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium-ion batteries, and in particular to an exhaust and fluid replenishing system for a battery core module. Background Art

[0002] Lithium-ion batteries are secondary batteries (rechargeable batteries) that rely primarily on the movement of lithium ions between positive and negative electrodes. A lithium-ion battery pack, also known as a battery module, is a lithium-ion battery manufacturing process that involves connecting multiple lithium-ion cells in parallel and series, taking into account system mechanical strength, thermal management, and battery management system (BMS) compatibility. Due to differences in cell systems, some projects experience capacity reduction before reaching their target service life, including the risk of gassing within the module cells. Lithium-ion battery gassing can occur for a variety of reasons, including abnormal chemical reactions within the cell, overcharge or over-discharge, and excessive water content. When a lithium-ion battery generates gas, it is charged, causing the cell to swell, leading to severe performance degradation. Furthermore, the bloated lithium-ion battery consumes a large amount of electrolyte, resulting in a rapid drop in cell cycle performance and a rapid degradation of electrochemical cell performance, ultimately rendering the cell unusable. Currently, the primary solution is to return the battery to the factory for replacement with a fresh one.

[0003] A Chinese invention application, publication number CN 105449152 A, discloses a lithium-ion battery equipped with a pneumatic, anti-flatulence, automatic refilling device. The device comprises a battery housing, a battery top cover, a positive electrode column, a negative electrode column, and a battery cell disposed within the housing. The battery housing is divided into a battery cell chamber, a reserve electrolyte chamber, and a gas buffer chamber, forming a pneumatic, anti-flatulence, automatic refilling device. While this structure effectively addresses safety hazards caused by battery flatulence and enables timely and automatic electrolyte replenishment, the device, built into the battery housing, is complex and expensive to manufacture. Consequently, despite years of disclosure, this technology has yet to be commercially adopted.

[0004] For example, a Chinese invention application with publication number CN 108258300 A discloses a lithium-ion power battery and its manufacturing, refilling, and venting methods. The method involves providing a refill hole on the top cover of a single cell; installing a secondary infusion tube for injection and venting within the refill hole, with the secondary infusion tube connected to a primary infusion tube at the end away from the refill hole; and providing a tube insertion port on the battery housing. The primary infusion tube is passed through the infusion port and out of the battery housing, forming a connected infusion network within the battery pack. This structure, which provides both refilling and venting through the reserved refill hole, is simple overall, but requires manual intervention, such as regular observation and, when significant bloating is detected, refilling and venting through the tube. While this method extends the battery life to a certain extent, the lack of automatic refilling and venting and the increased reliance on manual intervention make it less effective in actual use. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of the existing technology and propose a battery cell module exhaust and rehydration system with a simple structure. It can not only realize automatic rehydration and exhaust in the short term, but also realize long-term automatic rehydration and exhaust under human intervention, which is more feasible, thereby enhancing the cycle life of the battery cell and improving the safety of use.

[0006] The technical solution to achieve the purpose of this utility model is:

[0007] A battery cell module exhaust and rehydration system includes multiple battery cell bodies, wherein a transmission port is provided in the non-tab area of the battery cell body, one end of the transmission port is connected to the inner cavity of the battery cell body, and the other end is sealed with a transmission pipe, the transmission pipe is provided with a first valve suitable for opening and closing the channel, and the other end is sealed and connected to a replacement bottle fixedly mounted on the top of the battery cell body and inverted, the replacement bottle is pre-filled with spare electrolyte and the inner cavity is maintained in a low negative pressure state, so that the gas generated in the inner cavity of the battery cell body can be automatically pumped into the replacement bottle and the spare electrolyte is automatically replenished into the battery cell body, the replacement bottle is provided with a rehydration port and an air extraction port, the rehydration port is sealed with a top cover, and the air extraction port is sealed with a second valve suitable for opening and closing the air extraction port.

[0008] Furthermore, the replacement bottle is made of a transparent material and has scale lines on its surface.

[0009] Furthermore, a pressure sensor is installed in the replacement bottle, and an alarm connected to the pressure sensor signal is provided on the outside.

[0010] Furthermore, it also includes a controller and a micro electric diaphragm pump electrically connected to the controller, the controller is connected to the pressure sensor signal, and the second valve is in a normally open state and connected to the micro electric diaphragm pump.

[0011] Furthermore, the replacement bottle is provided with an explosion-proof port communicating with the interior, and the explosion-proof port is sealed with a one-way valve.

[0012] Furthermore, the end of the transmission pipe is connected to a first joint, which is a frustum with a small top and a large bottom. The mouth of the replacement bottle is connected to a second joint, and the inner wall of the second joint is a straight cylindrical structure suitable for tightly fitting outside the frustum and is fixedly embedded with a first sealing ring.

[0013] Furthermore, an inner wall of the end portion of the second joint is provided with a slope.

[0014] Furthermore, an annular extension platform is provided at the bottom of the first joint, and an arc-shaped plate is provided on the annular extension platform, which is located outside the first joint and is evenly distributed along the circumference and arranged with gaps. The top of the arc-shaped plate extends to the second joint and the outer wall is provided with a thread to form an annular locking piece. A second sealing ring is provided at the top of the inner ring of the annular locking piece, and a locking nut is connected to the outer ring thread.

[0015] By adopting the above technical solution, the utility model has the following beneficial effects:

[0016] (1) The utility model sets a replacement bottle which is pre-filled with electrolyte and has a low negative pressure inner cavity, so that the gas generated in the inner cavity of the battery cell can be drawn into the replacement bottle in real time, and at the same time, the electrolyte is automatically replenished into the battery cell under the action of gravity, so as to realize automatic liquid replenishment and exhaust in a short period of time; at the same time, since the capacity of the replacement bottle is limited, the pre-filled electrolyte will be used up and when the gas is collected to a certain extent and reaches saturation, the gas generated in the inner cavity of the battery cell cannot be removed in time. By setting a liquid replenishment port and an air extraction port, the replacement bottle can be replenished with liquid regularly through the liquid replenishment port, and the air extraction port can be connected to an external exhaust device for exhaust and negative pressure extraction, and the replacement bottle can be recycled, so as to realize long-term automatic liquid replenishment and exhaust without human intervention, which is more feasible, thereby enhancing the cycle life of the battery cell and improving the safety of use.

[0017] (2) The replacement bottle of the utility model is made of a transparent material, which is convenient for observing the spare electrolyte inside. At the same time, it is provided with a scale line to facilitate accurate assessment of the remaining amount of electrolyte so that the electrolyte can be replenished in a timely and effective manner.

[0018] (3) The utility model is provided with an alarm and a pressure sensor connected by signals, which automatically alarms when the gas pressure in the replacement bottle reaches a set value, reminding the user to take timely measures and exhaust the gas.

[0019] (4) The utility model is equipped with a micro electric diaphragm pump, which monitors the pressure in the replacement bottle in real time through a pressure sensor. When the pressure reaches the set value, it is triggered and sends a signal to the controller, which controls the micro electric diaphragm pump to automatically start and perform automatic air extraction operation.

[0020] (5) The utility model is additionally provided with a one-way valve. When the negative pressure state in the displacement bottle returns to normal pressure as the gas is continuously generated, if the gas is not pumped out in time, the gas can be automatically exhausted through the one-way valve when the pressure rises, thereby further improving the safety of battery use.

[0021] (6) The utility model realizes connection through the first joint and the second joint that cooperate with each other, and ensures the sealing performance through the first sealing ring.

[0022] (7) The utility model provides an inclined surface on the inner wall of the end of the second joint, making it easier to put it outside the first joint.

[0023] (8) The utility model tightens the locking nut, thereby pressing the second sealing ring against the outside of the second joint through the arc plate, thereby further improving the sealing performance of the joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the content of the utility model easier to understand, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein:

[0025] Figure 1 This is a simplified structural diagram of Example 1;

[0026] Figure 2 This is a schematic diagram of the docking structure of the first joint and the second joint of Example 1;

[0027] Figure 3 This is a simplified structural diagram of Example 2.

[0028] The reference numerals in the accompanying drawings are:

[0029] Battery cell body 1, transmission pipe 2, first valve 3, replacement bottle 4, top cover 5, second valve 6, first connector 7, second connector 8, first sealing ring 9, arc plate 10, second sealing ring 11, locking nut 12, one-way valve 13, micro electric diaphragm pump 14. DETAILED DESCRIPTION

[0030] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0031] (Example 1)

[0032] like Figures 1 to 2The illustrated battery cell module exhaust and fluid replenishment system includes four battery cell bodies 1. Each battery cell body has a transfer port in the non-tab area. One end of the transfer port communicates with the cell body's internal cavity, and the other end is sealedly connected to a transfer pipe 2. The transfer pipe 2 is equipped with a first valve 3 for opening and closing the channel, and the other end is sealedly connected to an inverted replacement bottle 4 fixed to the top of the battery cell body. The replacement bottle 4 is pre-filled with a small amount of backup electrolyte, and its internal cavity is maintained at a low negative pressure. This allows gas generated in the internal cavity of the battery cell body 1 to be automatically pumped into the replacement bottle 4, and the backup electrolyte is automatically replenished into the battery cell body 1, achieving automatic fluid replenishment and exhaust in the short term. Considering the limited capacity of the replacement bottle 4, the pre-filled backup electrolyte will eventually run out, and when gas accumulates to a certain level and reaches saturation, the gas generated in the internal cavity of the battery cell body 1 cannot be promptly discharged. In this embodiment, the replacement bottle 4 is provided with a fluid replenishment port and a gas extraction port. The fluid replenishment port is sealedly connected to a top cover 5, and the gas extraction port is sealedly connected to a second valve 6, which is used to open and close the gas extraction port. After opening the top cover 5 regularly, the liquid can be replenished into the replacement bottle 4 through the liquid replenishment port, and the external exhaust device can be connected through the exhaust port to exhaust and draw negative pressure, and it can be recycled to achieve long-term automatic liquid replenishment and exhaust without human intervention, which is more feasible, thereby enhancing the cycle life of the battery cell and improving the safety of use.

[0033] Specifically, the transmission port is provided at the top of the battery cell body 1, and the transmission pipe 2 is composed of a plurality of first pipes respectively connected to each battery cell body 1 and a second pipe connecting each first pipe and the displacement bottle 4. The end of the transmission pipe 2 is connected to a first joint 7, which is a frustum with a small top and a large bottom. The mouth of the displacement bottle 4 is connected to a second joint 8, and the inner wall of the second joint 8 is a straight cylindrical structure suitable for tightly fitting outside the frustum and fixedly embedded with a first sealing ring 9. By inserting the first joint 7 into the second joint 8, as the insertion depth gradually increases, the two structures are gradually locked and the first sealing ring 9 is pressed tightly between the two joints to achieve a sealed and fixed connection. In order to facilitate insertion, the inner wall of the end of the second joint 8 of this embodiment is provided with a bevel. To further enhance the sealing effect, an annular extension platform 9 is provided at the bottom of the first joint 7 in this embodiment. On this annular extension platform 9, arcuate plates 10 are positioned outside the first joint 7 and are evenly distributed along the circumference with gaps therebetween. The top of the arcuate plates 10 extends to the second joint 8, and the outer wall is threaded, forming an annular locking member. A second sealing ring 11 is provided at the top of the inner ring of the annular locking member, and a locking nut 12 is threadedly connected to the outer ring. By rotating the locking nut 12, the arcuate plates 10 are moved toward the center, pressing the second sealing ring 11 against the outside of the second joint 8, achieving a double-layer seal and enhancing the sealing effect.

[0034] The replacement bottle 4 is made of a transparent material, allowing easy observation of the reserve electrolyte inside. The outer surface is also marked with scale lines, allowing for accurate assessment of the remaining reserve electrolyte level, allowing for timely and effective rehydration. Furthermore, a pressure sensor is installed within the replacement bottle 4, and an external alarm connected to the pressure sensor signal is provided. When the gas pressure within the replacement bottle 4 reaches a set value, an alarm is automatically generated, alerting the user to take timely action and manually open the second valve 6, connect a vacuum device, and manually exhaust the gas to create negative pressure.

[0035] The replacement bottle 4 is also provided with an explosion-proof port connected to the interior, and a one-way valve 13 is sealed on the explosion-proof port to prevent untimely human operation or failure of the alarm. The gas can be exhausted through the one-way valve 13 immediately, avoiding the flatulence caused by failure to timely evacuate the gas after the negative pressure state in the replacement bottle 4 returns to normal pressure as the gas is continuously generated, thereby further improving the safety of battery use.

[0036] In this embodiment, a replacement bottle 4 is provided which is pre-filled with spare electrolyte and has a low negative pressure inner cavity, so that the gas generated in the inner cavity of the battery cell main body 1 can be pumped into the replacement bottle 4 in real time, and the electrolyte is automatically replenished into the battery cell main body under the action of gravity, thereby realizing automatic fluid replenishment and exhaust in a short period of time; at the same time, since the capacity of the replacement bottle 4 is limited, the pre-filled electrolyte will be used up and when the gas is collected to a certain extent and reaches saturation, the gas generated in the inner cavity of the battery cell main body 1 cannot be eliminated in time, and by providing a fluid replenishment port and an air extraction port, the replacement bottle 4 can be replenished with fluid regularly through the fluid replenishment port, and the air extraction port can be connected to an external air extraction device for exhaust and negative pressure extraction, and recycled, so as to achieve long-term automatic fluid replenishment and exhaust without human intervention, which is more feasible, thereby enhancing the cycle service life of the battery cell and improving the safety of use.

[0037] (Example 2)

[0038] The structure of this embodiment is similar to that of embodiment 1. Figure 3 As shown, the device further includes a controller and a micro-electric diaphragm pump 14 electrically connected to the controller. The controller is connected to the pressure sensor signal, and the second valve 6 is normally open and connected to the micro-electric diaphragm pump 14. The pressure sensor monitors the pressure in the displacement bottle 4 in real time. When the pressure reaches the set value, it is triggered and sends a signal to the controller, which controls the micro-electric diaphragm pump 14 to automatically open and perform an automatic air extraction operation, eliminating human intervention and making it more convenient to use.

[0039] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery module exhaust and fluid replenishment system, characterized by: The battery cell body comprises a plurality of battery cell bodies, wherein a transmission port is provided in a non-tab area of the battery cell body, one end of the transmission port is connected to the inner cavity of the battery cell body, and the other end is sealedly connected to a transmission pipe, the transmission pipe is provided with a first valve suitable for opening and closing the channel, and the other end is sealedly connected to a replacement bottle fixedly mounted on the top of the battery cell body and inverted, the replacement bottle is pre-filled with a spare electrolyte and the inner cavity is kept in a low negative pressure state, so that the gas generated in the inner cavity of the battery cell body can be automatically pumped into the replacement bottle and the spare electrolyte is automatically replenished into the battery cell body, the replacement bottle is provided with a fluid replenishment port and an air extraction port, the fluid replenishment port is sealed with a top cover, and the air extraction port is sealed with a second valve suitable for opening and closing the air extraction port.

2. The battery module exhaust and fluid replenishment system according to claim 1, characterized in that: The replacement bottle is made of a transparent material and has scale lines on its surface.

3. The battery module exhaust and fluid replenishment system according to claim 1, characterized in that: A pressure sensor is installed in the replacement bottle, and an alarm connected to the pressure sensor signal is provided on the outside.

4. The battery module exhaust and fluid replenishment system according to claim 3, characterized in that: It also includes a controller and a micro electric diaphragm pump electrically connected to the controller, the controller is connected to the pressure sensor signal, and the second valve is in a normally open state and connected to the micro electric diaphragm pump.

5. The battery module exhaust and fluid replenishment system according to claim 1, characterized in that: The replacement bottle is provided with an explosion-proof port communicating with the interior, and the explosion-proof port is sealed with a one-way valve.

6. The battery module exhaust and fluid replenishment system according to claim 1, characterized in that: The end of the transmission pipe is connected to a first joint, which is a frustum with a small top and a large bottom. The mouth of the replacement bottle is connected to a second joint, and the inner wall of the second joint is a straight cylindrical structure suitable for tightly fitting outside the frustum and is fixedly embedded with a first sealing ring.

7. The battery module exhaust and fluid replenishment system according to claim 6, characterized in that: An inner wall of the end portion of the second joint is provided with an inclined surface.

8. The battery module exhaust and fluid replenishment system according to claim 6, characterized in that: An annular extension platform is provided at the bottom of the first joint, and an arc-shaped plate is provided on the annular extension platform, which is located outside the first joint and is evenly distributed along the circumference and arranged at intervals. The top of the arc-shaped plate extends to the second joint and the outer wall is provided with a thread to form an annular locking piece. A second sealing ring is provided on the top of the inner ring of the annular locking piece, and a locking nut is connected to the outer ring thread.

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