Plastic shell structure for relieving acid stratification

Abstract

The utility model relates to the field of battery structures, and provides a plastic shell structure for relieving acid layering, which comprises a battery jar, a middle cover and a hollow connecting piece, the middle cover is installed above the battery jar to seal the battery jar, the connecting piece is installed on the side face of the battery jar, and the two ends of the connecting piece are bent into a first bent part and a second bent part respectively; the inner surfaces of the bending part I and the bending part II are respectively connected with the upper surface of the middle cover and the lower surface of the battery jar base in a sealing manner, the middle cover is provided with a middle cover valve hole, the inner surface of the bending part I is provided with an open hole communicated with the middle cover valve hole, the lower surface of the battery jar base is provided with a jar bottom valve hole, and the inner surface of the bending part II is provided with an open hole communicated with the jar bottom valve hole; a connecting piece valve hole is formed in the outer surface of the first bending part. The gas inlet and acid outlet is additionally arranged at the bottom of the bottom groove, the upper and lower parts of the plastic shell are communicated through the connecting piece, water loss in the battery using process is reduced, gas generated by electrolyzing water in the battery using process can be sent to the bottom to stir acid in the battery, and the sulfation problem caused by acid layering is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery structure, and in particular to a plastic shell structure for mitigating acid stratification. Background Technology

[0002] Thermal runaway and sulfation are important causes of lead-acid battery failure. During the later stages of charging, lead-acid batteries produce electrolyzed water. After prolonged use, the water content inside the battery continuously decreases, causing the electrolyte saturation in the separator to drop, which in turn exacerbates the thermal runaway reaction. In addition, gravity causes the high-density electrolyte inside the battery to continuously settle to the bottom, resulting in a widening density difference between the upper and lower parts of the electrolyte in the separator, which intensifies the sulfation of active materials and accelerates battery failure.

[0003] CN106532139A discloses a lead-acid battery and a silica gel for filling the lead-acid battery. The lead-acid battery includes a three-dimensional network structure composed of silica gel, which encapsulates the electrolyte within the gaps of the three-dimensional network structure. Due to the supporting effect of the three-dimensional network structure, the structure of the battery's active materials can be effectively locked in, preventing changes and thus preventing the electrolyte from stratifying, thereby delaying battery capacity decay. However, the manufacturing process of silica gel is complex and costly. Therefore, an ideal solution is needed. Summary of the Invention

[0004] This invention provides a plastic shell structure to alleviate acid stratification. An air inlet and acid outlet are added to the bottom of the bottom tank, and the upper and lower parts of the plastic shell are connected by a connector to reduce water loss during battery use. At the same time, the gas generated by water electrolysis during battery use can be sent to the bottom to stir the acid inside the battery, reducing sulfation problems caused by acid stratification.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A plastic shell structure for mitigating acid stratification includes a battery compartment, a middle cover, and a hollow connector. The middle cover is installed above the battery compartment to seal it. The connector is installed on the side of the battery compartment, and both ends of the connector are bent into a first bend and a second bend, respectively. The inner surfaces of the first bend and the second bend are respectively sealed to the upper surface of the middle cover and the lower surface of the battery compartment base. The middle cover has a valve hole. The inner surface of the first bend has an opening communicating with the valve hole. The lower surface of the battery compartment base has a bottom valve hole. The inner surface of the second bend has an opening communicating with the bottom valve hole. The outer surface of the first bend has a connector valve hole.

[0007] Preferably, the battery compartment is divided into several individual cells by vertical partitions.

[0008] Preferably, the battery compartment base is hollow, with an internal valve hole on the upper surface of the base and a valve hole at the bottom of the compartment located on the lower surface of the base.

[0009] Preferably, the valve hole inside the tank is sealed with a rubber cap.

[0010] Preferably, each cell is equipped with a corresponding valve hole inside the tank, a valve hole at the bottom of the tank, and a valve hole in the middle cover.

[0011] Preferably, the two bends of the connector face the same direction, and the bending angle is adapted to the bending angle of the upper and lower surfaces and sides of the battery compartment. More preferably, the bending angle of the two bends of the connector is 90°.

[0012] Preferably, the connectors are installed on the same side of the battery compartment, and each cell is equipped with one connector.

[0013] Preferably, the battery compartment has a longitudinal groove on its side, and the connector is installed in the longitudinal groove.

[0014] Preferably, the upper surface of the middle cover and the lower surface of the battery slot base are provided with horizontal grooves, and the bent part of the connector is installed in the horizontal groove.

[0015] Preferably, the valve hole of the connector is sealed with a rubber cap, and the valve opening pressure is > 30 kPa.

[0016] Therefore, the beneficial effects of this utility model are as follows: an air inlet and an acid outlet are added to the bottom of the bottom tank, and the upper and lower parts of the plastic shell are connected by a connector, so that the plastic shell has multiple functions. The battery can undergo acid cycling formation and reduce water loss during battery use, avoiding thermal runaway failure caused by excessive water loss. At the same time, the gas generated by water electrolysis during battery use can be sent to the bottom to stir the acid inside the battery, reducing the sulfation problem caused by acid stratification. Attached Figure Description

[0017] Figure 1 This is an exploded view of the plastic shell structure of this utility model for mitigating acid stratification.

[0018] Figure 2 This is an assembly diagram of the plastic shell structure for mitigating acid stratification according to this utility model.

[0019] Figure 3 This is a structural diagram of the middle cover.

[0020] Figure 4 This is a structural diagram of the bottom of the battery compartment.

[0021] Figure 5 This is a structural diagram of the battery compartment base.

[0022] Figure 6 This is an inverted view of the connector.

[0023] In the diagram: 1. Battery slot, 11. Longitudinal groove one, 2. Base, 21. Valve hole inside the slot, 22. Valve hole at the bottom of the slot, 23. Horizontal groove two, 3. Middle cover, 31. Valve hole in the middle cover, 32. Longitudinal groove two, 33. Horizontal groove one, 4. Connector, 41. Vertical part, 42. Bend one, 421. Opening one, 422. Valve hole of connector, 43. Bend two, 431. Opening two. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] Example

[0026] A plastic shell structure for mitigating acid stratification includes a battery compartment 1, a middle cover 3, and a connector 4. The base 2 of the battery compartment 1 is hollow, with an inner valve hole 21 on the upper surface and a bottom valve hole 22 on the lower surface. The middle cover 3 covers the battery compartment 1 and is hollow, with a middle cover valve hole 31 on its upper surface. The connector 4 is hollow, with a first bend 42 and a second bend 43 at both ends connecting to the middle cover 3 and the base 2, respectively. The lower surface of the first bend 42 has a hole communicating with the middle cover valve hole 31, and its upper surface also has a connector valve hole 422. The upper surface of the second bend 43 has a hole communicating with the bottom valve hole 22. Specifically:

[0027] The battery compartment 1 is formed by the side wall and the base 2 to form a container with an open top. The base 2 is a flat plate with a certain thickness and a hollow interior, which is evenly divided into several individual compartments by several vertical partitions.

[0028] The upper surface of the base 2 (the surface inside the battery compartment 1) is provided with an internal valve hole 21. The internal valve hole 21 is sealed with a rubber cap. When the gas pressure generated in the individual cell inside the battery reaches a preset pressure, the rubber cap is pushed up, and gas enters the individual cell inside the battery through the bottom of the battery compartment 1. When the gas pressure generated in the individual cell inside the battery is less than the preset pressure, the rubber cap falls down to seal the valve hole, preventing gas from entering the individual cell inside the battery. The number and position of the internal valve holes 21 can be arbitrarily set, as long as the above effect is achieved. Preferably, one internal valve hole 21 is provided for each individual cell, that is, the number of internal valve holes 21 corresponds to the number of individual cells, and the internal valve hole 21 is preferably located at the center of the bottom surface of the individual cell.

[0029] The lower surface of the base 2 (that is, the surface inside the battery compartment 1) is provided with a bottom valve hole 22 for easy communication with the outside. The number and position of the bottom valve holes 22 can be arbitrarily set as long as the above-mentioned effect is achieved. Preferably, the bottom valve holes 22 correspond one-to-one with the valve holes 21 inside the compartment and are coaxially arranged with the valve holes 21 inside the compartment. That is, one bottom valve hole 22 is provided for each individual cell, and the bottom valve hole 22 is preferably located at the center of the bottom surface of the individual cell.

[0030] The battery compartment 1 has an opening at the top, and a middle cover 3 is used to cover the upper surface of the battery compartment 1 for sealing. The middle cover 3 has a longitudinally penetrating middle cover valve hole 31 for adding acid and facilitating the connection of the connector 4. Gas generated during battery use escapes from the middle cover valve hole 31. The number and position of the middle cover valve holes 31 can be arbitrarily set, as long as the above-mentioned effects are met. Preferably, one middle cover valve hole 31 is provided for each individual cell, and the middle cover valve hole 31 is preferably located at the center of the upper surface of the individual cell.

[0031] The connector 4 consists of a vertical section 41 in the middle and bent sections at both ends. The entire interior is hollow, allowing for gas flow. The connector 4 is installed on the side of the battery compartment 1, preferably on the same side of the battery compartment 1. The number and position of the connectors 4 can be arbitrarily set. Preferably, one connector 4 is provided for each individual cell, meaning the number of connectors 4 corresponds to the number of individual cells. The vertical section 41 of the connector 4 is preferably located on the longitudinal centerline of the side of the individual cell.

[0032] The bent portion at the upper end of connector 4 is called bent portion one 42, and the bent portion at the lower end is called bent portion two 43. When installing connector 4, the lower surface of bent portion one 42 is sealed and fitted with the upper surface of the middle cover 3. The lower surface of bent portion one 42 has a hole that communicates with the valve hole 31 of the middle cover. The upper surface of bent portion one 42 is also provided with a connector valve hole 422, which is sealed by a rubber cap. Preferably, the connector valve hole 422 is coaxial with the hole on the lower surface of bent portion one 42. The upper surface of bent portion two 43 is sealed and fitted with the lower surface of the base 2 of battery compartment 1. The hole on the upper surface of bent portion one 42 communicates with the valve hole 22 at the bottom of the compartment. Preferably, the angle between the bent portion and the vertical portion 41 is consistent with the angle between the side and bottom / top surfaces of battery compartment 1.

[0033] To facilitate the installation of connector 4, the battery compartment 1 and the middle cover 3 have longitudinal grooves on their sides, which match and connect to form a complete longitudinal groove 11 for the installation of the vertical part 41 of connector 4. The upper surface of the middle cover 3 has a horizontal groove 33 for the installation of the bent part 42 of connector 4; the lower surface of the base 2 has a horizontal groove 23 for the installation of the bent part 43 of connector 4. The longitudinal groove 11 runs through the entire side, that is, the length of the longitudinal groove 11 is the same as the height of the side and the length of the vertical part 41 of connector 4. The number and position of the grooves depend on the number and position of connector 4. Preferably, one longitudinal groove 11 is provided for each cell, that is, the number of longitudinal grooves 11 is set for the number of cells, and the position of the longitudinal groove 11 is preferably located on the longitudinal center line of the side of the cell; one horizontal groove is provided for each cell, that is, the number of horizontal grooves is set for the number of cells, and the two ends of the horizontal groove 1 33 are preferably the top end of the longitudinal groove 11 and the middle cover valve hole 31, and the two ends of the horizontal groove 23 are exactly the bottom end of the longitudinal groove 11 and the bottom valve hole 22.

[0034] Without connector 4 installed, the battery has valve holes at both the top and bottom. The top has a middle cover valve hole 31, and the bottom has a tank bottom valve hole 22. By connecting an external acid circulation device, the battery formation process uses an acid circulation process, resulting in better formation effect and more stable formation temperature control than water bath formation. With connector 4 installed, the acid pot is installed on the connector valve hole 422. The battery, connector 4, and acid pot form a new formation combination. During battery formation, part of the gas is discharged through the acid pot, and the other part enters the connector 4. During battery cycling, the gas generated is discharged to the connector 4 through the middle cover valve hole 31, and then re-enters the battery through the lower valve hole, agitating the internal acid, reducing acid stratification caused by the sedimentation of high-density acid, increasing the cathode absorption reaction of gas at the negative electrode, and reducing battery water loss due to gas loss.

[0035] Example 1

[0036] A plastic shell structure to mitigate acid stratification, such as Figure 1 and 2 As shown, it is assembled from a battery compartment 1, a middle cover 3, and a connector 4. The middle cover 3 is installed above the battery compartment 1, and the connector 4 is installed on the same side of the battery compartment 1, with both ends of the connector 4 bent to abut against the upper surface of the middle cover 3 and the lower surface of the battery compartment 1, respectively. The specific structure is described below:

[0037] Battery compartment 1 is formed by side walls and base 2 into a cuboid with an open top. The interior of battery compartment 1 is evenly divided into 6 compartments by 5 vertical partitions.

[0038] The base 2 of battery compartment 1 is a flat plate with a certain thickness and a hollow interior. For example... Figure 4As shown, the upper surface of the base 2 (the surface inside the battery compartment 1) is provided with an internal valve hole 21. The internal valve hole 21 is sealed with a rubber cap. When the gas pressure generated in the individual cell inside the battery reaches a preset pressure, the rubber cap is pushed up, and gas enters the individual cell inside the battery through the bottom of the battery compartment 1. When the gas pressure generated in the individual cell inside the battery is less than the preset pressure, the rubber cap falls down to seal the valve hole, preventing gas from entering the individual cell inside the battery. One internal valve hole 21 is provided for each individual cell, resulting in a total of six internal valve holes 21. The internal valve holes 21 are approximately located at the center of the bottom surface of each individual cell. Figure 5 As shown, the lower surface of the base 2 (that is, the surface inside the battery slot 1) is provided with 6 slot bottom valve holes 22 to facilitate communication with the outside. The 6 slot bottom valve holes 22 correspond one-to-one with the 6 slot inner valve holes 21 and are coaxially arranged.

[0039] The battery compartment 1 has an opening at the top, and the middle cover 3 is used to cover the upper surface of the battery compartment 1 for sealing. For example... Figure 3 As shown, the middle cover 3 has a longitudinally penetrating middle cover valve hole 31 for adding acid and facilitating the connection of the connector 4. Gas generated during battery use overflows from the middle cover valve hole 31. There is one middle cover valve hole 31 for each cell, that is, a total of 6 middle cover valve holes 31 are provided, and the position of the middle cover valve hole 31 is approximately located at the center of the upper surface of the cell.

[0040] like Figure 6 As shown, the connector 4 consists of a vertical section 41 in the middle and bent sections at both ends. The angle between the vertical section 41 and the bent sections is 90°, and the two bent sections are in the same direction. The connector 4 is shaped like a "[". The entire interior of the bent sections is hollow, allowing air to circulate. One connector 4 is provided for each cell, meaning a total of 6 connectors 4 are installed. The vertical section 41 of the connector 4 is located on the longitudinal centerline of the side of the cell.

[0041] The upper bend of connector 4 is called bend 42, and the lower bend is called bend 43. When installing connector 4, the lower surface of bend 42 is sealed to the upper surface of the middle cover 3. The lower surface of bend 42 has an opening 421 that communicates with the valve hole 31 of the middle cover. The upper surface of bend 42 also has a connector valve hole 422, which is sealed with a rubber cap. The connector valve hole 422 is coaxial with the opening on the lower surface of bend 42. The upper surface of bend 43 is sealed to the lower surface of the base 2 of the battery compartment 1. The upper surface of bend 42 has an opening 431 that communicates with the valve hole 22 at the bottom of the compartment. The opening pressure of connector valve hole 422 is > 30 kPa (the opening pressure of the rubber cap corresponding to a conventional plastic shell structure is 30 kPa), increasing the circulation of gas generated during battery use, reducing battery water loss, and preventing bulging caused by excessive battery gas pressure.

[0042] To facilitate the installation of connector 4, grooves are provided on battery compartment 1 and middle cover 3. The number and position of the grooves depend on the number and installation position of connector 4. Longitudinal grooves 11-1 and 11-2 are respectively provided on the sides of battery compartment 1 and middle cover 3, which match and connect to form a complete longitudinal groove 11 for the installation of the vertical part 41 of connector 4. A horizontal groove 33 is provided on the upper surface of middle cover 3 for the installation of the bent part 42 of connector 4; a horizontal groove 23 is provided on the lower surface of base 2 for the installation of the bent part 43 of connector 4. The longitudinal groove 11 extends through the entire side, meaning the length of the longitudinal groove 11 is the same as the height of the side and the length of the vertical part 41 of connector 4. The two ends of horizontal groove 33 are exactly the top of longitudinal groove 11 and the valve hole 31 of middle cover, while the two ends of horizontal groove 23 are exactly the bottom of longitudinal groove 11 and the valve hole 22 at the bottom of groove.

[0043] The usage process is as follows: Without connector 4 installed, the battery has valve holes at both the top and bottom. The top has a middle cover valve hole 31, and the bottom has a tank bottom valve hole 22. By connecting an external acid circulation device, the battery formation process uses an acid circulation process, which results in better formation effect and more stable formation temperature control than water bath formation. With connector 4 installed, the acid pot is installed on the connector valve hole 422. The battery, connector 4, and acid pot form a new formation combination. During the battery formation process, part of the gas is discharged through the acid pot, and the other part enters the connector 4. During battery cycling, the gas generated is discharged to the connector 4 through the middle cover valve hole 31, and then re-enters the battery through the lower valve hole, agitating the internal acid, reducing acid stratification caused by the sedimentation of high-density acid, increasing the cathode absorption reaction of gas at the negative electrode, and reducing battery water loss due to gas loss.

[0044] Although this document frequently uses terms such as groove and single cell, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; it is not intended as an additional limitation. The specific embodiments described herein are merely illustrative examples of this utility model. Those skilled in the art to which this utility model pertains can make various modifications or additions to the described specific embodiments or adopt similar methods to replace them, but without departing from the protection scope defined by this utility model.

Claims

1. A plastic shell structure for mitigating acid stratification, characterized in that, The device includes a battery compartment, a middle cover, and a hollow connector. The middle cover is installed above the battery compartment to seal it. The connector is installed on the side of the battery compartment, and both ends of the connector are bent into a first bend and a second bend, respectively. The inner surfaces of the first bend and the second bend are respectively sealed to the upper surface of the middle cover and the lower surface of the battery compartment base. The middle cover has a valve hole, and the inner surface of the first bend has an opening that communicates with the valve hole. The lower surface of the battery compartment base has a bottom valve hole, and the inner surface of the second bend has an opening that communicates with the bottom valve hole. The outer surface of the first bend has a connector valve hole.

2. The plastic shell structure for mitigating acid stratification according to claim 1, characterized in that, The battery compartment is divided into several individual cells by vertical partitions.

3. The plastic shell structure for mitigating acid stratification according to claim 1, characterized in that, The battery compartment base is hollow, with an internal valve hole on the upper surface and a valve hole at the bottom of the compartment on the lower surface of the base.

4. The plastic shell structure for mitigating acid stratification according to claim 1, characterized in that, The valve holes inside the tank and the valve holes of the connectors are sealed with rubber caps.

5. A plastic shell structure for mitigating acid stratification according to claim 2, characterized in that, Each cell is equipped with a corresponding bottom valve hole and middle cover valve hole.

6. The plastic shell structure for mitigating acid stratification according to claim 1, characterized in that, The two bends of the connector face the same direction, and the bending angle is adapted to the bending angle of the upper and lower surfaces and sides of the battery compartment.

7. A plastic shell structure for mitigating acid stratification according to claim 6, characterized in that, The bending angle of the two bends of the connector is 90°.

8. A plastic shell structure for mitigating acid stratification according to claim 1, 6, or 7, characterized in that, The connector is installed on the same side of the battery compartment.

9. A plastic shell structure for mitigating acid stratification according to claim 1, characterized in that, The battery compartment has a longitudinal groove on its side, and the connector is installed in the longitudinal groove.

10. A plastic shell structure for mitigating acid stratification according to claim 1 or 9, characterized in that, The upper surface of the middle cover and the lower surface of the battery slot base are both provided with horizontal grooves, and the bent part of the connector is installed in the horizontal groove.

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