Lithium battery liquid supplementing structure and lithium battery

Abstract

The utility model relates to a lithium battery liquid supplementing structure and a lithium battery, and the lithium battery liquid supplementing structure is at least partially attached to one side of a battery cell so as to be extruded by the battery cell when the volume of the battery cell is expanded. The lithium battery liquid supplementing structure comprises a main body part, a spraying part, a liquid absorbing elastic body and a one-way valve, according to the lithium battery liquid supplementing structure and the lithium battery provided by the utility model, the electrolyte can be accommodated in the main body part, and the electrolyte at the lower end of the battery cell is conveyed to the upper end of the battery cell through the guide flow channel and the spraying channel and then is discharged by utilizing the characteristics that the liquid absorbing elastomer can absorb liquid and expand and can discharge the absorbed liquid when being extruded; the one-way valve is connected to the liquid inlet to achieve one-way liquid inlet of the lower end of the body part. Therefore, excessive electrolyte at the lower end of the battery cell can be transferred to the upper end of the battery cell, the condition that the middle-upper end of the battery cell lacks electrolyte after the lithium battery is used for a long time is relieved, and the lithium precipitation risk of the battery is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a lithium battery refilling structure and a lithium battery. Background Art

[0002] The diaphragm is a key component of lithium-ion batteries. Its unique microporous structure can transmit ions while isolating electrons, thereby enabling the charging and discharging of lithium-ion batteries. Due to the large porosity of the diaphragm and the fact that at least one side of the base membrane of conventional diaphragms is sprayed with a ceramic coating with liquid absorption and retention capabilities, the electrolyte preferentially penetrates the diaphragm during the infiltration process and then penetrates into the interior of the electrode plates. As the battery energy density increases, the coating thickness of the electrode plates gradually increases and the thickness of the diaphragm gradually decreases. Although this can increase the time of the infiltration process, the diaphragm's porosity is limited, and in large-capacity energy storage cells, the problem of poor internal cell infiltration still exists.

[0003] In addition, as the battery is continuously recycled, the electrolyte inside the middle and upper end electrodes is continuously consumed in the vertical direction of the battery, and the free electrolyte at the bottom is difficult to be replenished to the middle and upper end electrodes in time through the capillary action of the diaphragm or electrode, resulting in the risk of lithium plating in the middle and upper end electrodes. Utility Model Content

[0004] In view of this, the embodiments of the present application provide a lithium battery refilling structure and a lithium battery to solve the problem of lithium plating risk in the middle and upper electrode plates of the battery in the background art.

[0005] In a first aspect, an embodiment of the present application provides a lithium battery refilling structure, which is disposed inside a lithium battery housing, and at least a portion of the lithium battery refilling structure is attached to one side of a cell of the lithium battery, comprising:

[0006] A main body portion, comprising an inner cavity and a guide flow channel extending along the Z direction, wherein the main body portion is capable of elastic deformation at the location of the inner cavity, the guide flow channel is in communication with the inner cavity, and the lower end of the main body portion along the Z direction has at least one liquid inlet capable of allowing the electrolyte in the shell to flow into the inner cavity;

[0007] a spray portion, at least one of the spray portions being disposed on a side of the main body facing the battery cell along the Z direction, and extending along the Y direction to cover the battery cell; a spray channel communicating with the guide flow channel being formed in the spray portion; and a plurality of penetrating spray ports being formed on a side of the spray portion facing the battery cell along the Z direction, the spray ports being capable of discharging electrolyte transported from the guide flow channel to the spray channel;

[0008] a liquid-absorbing elastic body, the liquid-absorbing elastic body being arranged in the inner cavity, the liquid-absorbing elastic body being capable of absorbing liquid and expanding, and being capable of discharging the absorbed liquid when squeezed;

[0009] A one-way valve is connected to the liquid inlet so that the electrolyte flowing into the inner cavity from the liquid inlet cannot flow out from the liquid inlet.

[0010] In an optional embodiment, the two spray parts are arranged along the X direction to cover part of the battery core, and the two guide flow channels are arranged along the X direction on both sides of the inner cavity and are respectively connected to the corresponding spray parts.

[0011] In an optional embodiment, each of the spray parts is provided with a plurality of spray openings spaced apart along the X direction; and the opening size of the spray openings gradually increases away from the guide channel along the X direction.

[0012] In an optional embodiment, the liquid inlet is arranged on both sides of the main body and is connected to the inner cavity and the guide channel.

[0013] In an optional embodiment, the one-way valve includes a baffle, which is hinged to the inner wall of the main body along the upper edge of the Z direction. When the lower edge of the baffle along the Z direction abuts against the inner bottom surface of the main body, the liquid inlet is closed, and the baffle can move from the liquid inlet toward one side of the inner cavity.

[0014] In a second aspect, an embodiment of the present application provides a lithium battery, comprising a shell, a battery cell, and the lithium battery refilling structure described in the first aspect, wherein the battery cell and the lithium battery refilling structure are arranged inside the shell.

[0015] In an optional embodiment, the battery cell has rounded corners or oblique angles on both sides along the X direction; along the Y direction, the projection of the guide channel coincides with a portion of the projection of the rounded corners or the oblique angles.

[0016] In an optional embodiment, at least two battery cells are installed in the shell, the main body is located between two adjacent battery cells, and the spray part is attached to one side of the two battery cells along the Z direction.

[0017] In an optional embodiment, the lithium battery further includes a cover plate, which covers one side of the open end of the shell to seal the battery cell and the lithium battery rehydration structure within the shell; the cover plate has an air avoidance groove along the Z direction toward the side of the battery cell, and the air avoidance groove is used to accommodate the connecting piece and the pole ear of the lithium battery, as well as the spray part.

[0018] In an optional embodiment, the two spray parts are spaced apart along the X direction so that a gap is formed between the two spray parts; an explosion-proof valve is provided on the cover plate, and the position of the explosion-proof valve corresponds to the position of the gap.

[0019] The lithium battery refilling structure and lithium battery provided in the embodiments of the present application can accommodate electrolyte in the main body. By utilizing the characteristics of the liquid-absorbing elastomer that can absorb liquid and expand, and can discharge the absorbed liquid when squeezed, the electrolyte at the lower end of the battery cell is transported to the upper end of the battery cell through the guide flow channel and the spray channel and then discharged. The one-way valve is connected to the liquid inlet to achieve one-way liquid inflow at the lower end of the main body. In this way, the utility model can transfer excess electrolyte at the lower end of the battery cell to the upper end of the battery cell, alleviate the situation where the upper end of the battery cell lacks electrolyte after long-term use of the lithium battery, and reduce the risk of lithium deposition in the battery.

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 A three-dimensional schematic diagram of a lithium battery refilling structure provided in an embodiment of the present application;

[0023] Figure 2 Schematic diagram of the connection relationship between the lithium battery refilling structure and the battery cell provided in the embodiment of the present application;

[0024] Figure 3 A schematic cross-sectional view of a lithium battery refilling structure provided in an embodiment of the present application;

[0025] Figure 4 for Figure 3 A magnified view of part A;

[0026] Figure 5 A schematic diagram of the lithium battery structure provided in an embodiment of the present application;

[0027] Figure 6 This is an exploded diagram of the lithium battery structure provided in an embodiment of the present application.

[0028] The reference numerals in the figures are:

[0029] 1. Liquid-absorbing elastomer;

[0030] 2. Main body; 20. Inner cavity; 21. Guide channel; 23. Liquid inlet; 24. Transition channel;

[0031] 3. One-way valve; 31. Baffle;

[0032] 4. Spraying part; 41. Spraying channel; 42. Spraying port;

[0033] 10. Lithium battery;

[0034] 100, housing;

[0035] 200, battery cell; 201, rounded corner; 202, buckle;

[0036] 300, cover plate; 301, air avoidance groove; 302, explosion-proof valve. DETAILED DESCRIPTION

[0037] To make the technical solutions and beneficial effects of the present invention more clearly understood, the following detailed description is given by way of specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly illustrate the details of the local features. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0038] In the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of simplifying the description of the present invention, and do not indicate that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and should not be understood as a limitation to the present invention.

[0039] In this utility model, the terms "first" and "second" are used solely for descriptive purposes and should not be construed as indicating the relative importance of the features indicated or the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two or three, and "several" means at least one, such as one, two, or three, unless otherwise expressly specified.

[0040] In this utility model, unless otherwise expressly defined, the terms "install," "connect," "connect," "fix," "dispose," etc. should be understood broadly. For example, "connect" can mean fixed, removable, or integrated; it can mean mechanical or electrical; it can mean direct or indirect connection through an intermediary; it can also mean internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0041] In the present invention, unless otherwise clearly defined, when a first feature is “on,” “above,” “above,” “above,” “below,” “below,” or “below” a second feature, the first feature and the second feature may be in direct contact, or the first feature and the second feature may be in indirect contact via an intermediate medium. Moreover, when a first feature is “on,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0042] In the present invention, the X direction, the Y direction, and the Z direction represent different directions. For ease of understanding, the X direction, the Y direction, and the Z direction are set based on a Cartesian coordinate system in this embodiment.

[0043] In order to fully understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below. However, in addition to these detailed descriptions, the present application may also have other implementation methods.

[0044] This embodiment provides a lithium battery 10, such as Figure 1 、 Figure 5 、 Figure 6 As shown, it includes a shell 100, a battery cell 200 and a lithium battery refilling structure, and the battery cell 200 and the lithium battery refilling structure are arranged inside the shell 100.

[0045] The lithium battery refilling structure is at least partially attached to one side of the battery cell 200 so as to be squeezed when the battery cell 200 expands in volume. Figures 1-4 As shown, the lithium battery liquid replenishing structure includes: a main body 2, a spraying part 4, a liquid absorbing elastic body 1 and a one-way valve 3.

[0046] The main body 2 includes an inner cavity 20 and a guide channel 21 extending along the Z direction. The main body 2 can produce elastic deformation at the position of the inner cavity 20. The guide channel 21 is connected to the inner cavity 20, and the lower end of the main body 2 along the Z direction has at least one liquid inlet 23 for the electrolyte in the shell 100 to flow into the inner cavity 20.

[0047] The spray portion 4 is arranged on the side of the main body 2 facing the battery cell 200 along the Z direction, and the spray portion 4 extends along the Y direction to cover the battery cell 200. A spray channel 41 connected to the guide flow channel 21 is formed in the spray portion 4. The spray portion 4 is provided with a plurality of penetrating spray ports 42 on the side facing the battery cell 200 along the Z direction. The spray ports 42 can discharge the electrolyte transported from the guide flow channel 21 to the spray channel 41.

[0048] The liquid-absorbent elastic body 1 is disposed in the inner cavity 20 . The liquid-absorbent elastic body 1 can absorb liquid and expand, and can discharge the absorbed liquid when squeezed.

[0049] The one-way valve 3 is connected to the liquid inlet 23 so that the electrolyte flowing into the inner cavity 20 from the liquid inlet 23 cannot flow out from the liquid inlet 23 .

[0050] The lithium battery 10 and its lithium battery rehydration structure provided in the embodiment of the present application can accommodate electrolyte in the main body 2. By utilizing the characteristics of the liquid-absorbing elastomer 1 that can absorb liquid and expand, and can discharge the absorbed liquid when squeezed, the electrolyte at the lower end of the battery cell 200 is transported to the upper end of the battery cell 200 through the guide channel 21 and the spray channel 41 and then discharged. The one-way valve 3 is connected to the liquid inlet 23 to realize one-way liquid inflow at the lower end of the main body 2. In this way, the lithium battery 10 and its lithium battery rehydration structure provided in the embodiment of the present application can transfer excess electrolyte at the lower end of the battery cell 200 to the upper end of the battery cell 200, alleviate the situation where the upper end of the battery cell 200 lacks electrolyte after long-term use of the lithium battery 10, and reduce the risk of lithium plating in the battery.

[0051] The lithium battery refilling structure provided in the embodiment of the present application works as follows:

[0052] like Figure 2 As shown, in this embodiment, with the Z direction as the vertical direction, after long-term use of the lithium battery 10, the internal electrolyte is deposited at the lower end of the battery cell 200. The provided lithium battery refill structure is partially attached to one side of the battery cell 200, and the battery cell 200 has the physical characteristics of shrinking and absorbing during discharge and expanding during charging. Therefore, as the battery cell 200 discharges, the electrolyte at the lower end of the lithium battery 10 is continuously absorbed by the liquid-absorbing elastic body 1 through the liquid inlet 23. The liquid-absorbing elastic body 1 is a material that can absorb liquid and expel the liquid after being squeezed, such as a sponge or foam. After the battery cell 200 is discharged, the volume of the battery cell 200 shrinks, and the liquid-absorbing elastic body 1 expands after absorbing the liquid. As the battery cell 200 charges, the liquid-absorbing elastic body 1, which has absorbed the liquid, is affected by the volume expansion of the battery cell 200, and the electrolyte inside it is squeezed out and transported along the guide channel 21 and the spray channel 41 to the upper end of the battery cell 200 and then discharged from the spray port 42, replenishing the electrolyte at the upper end of the battery cell 200 and reducing the difference in electrolyte content between the upper and lower ends of the battery cell 200. Among them, the function of the one-way valve 3 is to ensure that the liquid at the liquid inlet 23 can only enter the interior of the main body 2 from the outside of the main body 2. In this way, when the liquid-absorbing elastic body 1 is discharged, the electrolyte will not leak from the liquid inlet 23 when entering the guide channel 21.

[0053] In an optional embodiment, if Figure 2 、 Figure 3As shown, two spray portions 4 are arranged along the X-direction to cover a portion of the battery cell 200, and two guide channels 21 are arranged along the X-direction on both sides of the inner cavity 20 and are respectively connected to the corresponding spray portions 4. In this embodiment, the layout of the guide channels 21 on both sides allows the liquid to be more quickly and evenly transferred to the upper end of the battery cell 200 when the liquid-absorbing elastomer 1 discharges liquid. In this embodiment, the X-direction is the length direction of the battery cell 200. The arrangement of the two spray portions 4 along the X-direction can make the sprayed electrolyte more evenly distributed along the length direction of the battery cell 200, thereby promoting the absorption of the electrolyte by the upper end of the battery cell 200.

[0054] In an optional embodiment, if Figure 1 As shown, each spray portion 4 is provided with a plurality of spray openings 42 spaced apart along the X-direction. The openings of the spray openings 42 gradually increase in size as they move away from the guide channel 21 in the X-direction. In this embodiment, the openings of the spray openings 42 along the X-direction are designed to gradually increase in size. This layout prioritizes ensuring sufficient electrolyte at the center of the battery cell 200 along the X-direction. This allows the electrolyte at the center of the battery cell 200 to diffuse from top to bottom and to both sides under the effects of gravity and capillary action. Combined with the relatively smaller spray openings 42 located closer to the guide channel 21, this ensures that all parts of the battery cell 200 along the X-direction fully absorb the electrolyte.

[0055] In an optional embodiment, if Figure 1 As shown, the guide channel 21 is connected to the midpoint of the spray channel 41 along the Y direction. In this embodiment, the connection position between the guide channel 21 and the spray channel 41 is at the midpoint of the Y direction, which can facilitate the uniform diffusion of the electrolyte in the Y direction after entering the spray channel 41, that is, in the width direction of the battery cell 200 in this embodiment, and facilitate uniform absorption of the electrolyte along the width of the battery cell 200.

[0056] In an optional embodiment, if Figures 1-4 As shown, the liquid inlet 23 is provided on both sides of the main body 2 and is in communication with the inner cavity 20 and the guide channel 21. In this embodiment, the liquid inlet 23 is provided on both sides of the main body 2 so that the liquid inlet 23 is exposed between the battery cells 200, making it easier to absorb electrolyte. The liquid inlet 23 is in communication with the inner cavity 20 and the guide channel 21 so that the electrolyte entering through the liquid inlet 23 can be quickly absorbed by the liquid-absorbing elastomer 1, or a portion can directly enter the guide channel 21.

[0057] In an optional embodiment, if Figure 3 、 Figure 4As shown, the one-way valve 3 includes a baffle 31. The upper edge of the baffle 31 along the Z direction is hinged to the inner wall of the main body 2. When the lower edge of the baffle 31 along the Z direction abuts the inner bottom surface of the main body 2, the liquid inlet 23 is closed, and the baffle 31 can move from the liquid inlet 23 toward the side of the inner cavity 20. In this embodiment, the one-way valve 3 is simple in structure. Only one baffle 31 is used to achieve unidirectional liquid inflow to the liquid inlet 23. The principle is that the baffle 31 is a rotatable structure, such as Figure 4 As shown, the inner bottom surface of the main body 2 can cooperate with the baffle 31 to close the liquid inlet 23 when the baffle 31 rotates to the lowest position. It can be understood that Figure 4 As shown, the length of the baffle 31 should be designed to be greater than the length of the liquid inlet 23 along the Z direction. In this way, when the lower end of the baffle 31 abuts the inner bottom surface of the main body 2, it can only move toward one side of the inner cavity 20. When there is electrolyte outside the main body 2, the electrolyte enters the main body 2 from the liquid inlet 23 under the action of hydraulic pressure. At this time, a gap exists between the lower end of the baffle 31 and the inner bottom surface of the main body 2. When the liquid-absorbing elastic body 1 is squeezed to discharge liquid, because the inner cavity 20 of the main body 2 is pressurized and the pressure is greater than that outside the main body 2, the baffle 31 will press against the inner bottom surface of the main body 2 under the action of pressure, so that the liquid inlet 23 remains in a closed state, thereby realizing the one-way flow function of the one-way valve 3.

[0058] In an optional embodiment, if Figure 4 As shown, the main body 2 also includes a transition channel 24, which connects the inner cavity 20 and the guide channel 21. The transition channel 24 extends along the X direction, is perpendicular to the guide channel 21, and is aligned with the liquid inlet 23, so as to facilitate the electrolyte to flow into the inner cavity 20 after flowing from the liquid inlet 23.

[0059] In an optional embodiment, if Figure 2 As shown, the battery cell 200 of the lithium battery 10 of this embodiment has rounded corners 201 or bevels on both sides along the X direction; along the Y direction, the projection of the guide channel 21 coincides with the projection of part of the rounded corner 201 or bevel. In this embodiment, the space formed by the rounded corner 201 of the battery cell 200 (the extra space relative to the case without the bevel) is used to provide space for the guide channel 21, so that the guide channel 21 can be protected as much as possible from the impact of the expansion of the battery cell 200 (different from the inner cavity 20 of the main body 2, which needs to be squeezed by the battery cell 200). Because the squeezing of the guide channel 21 is likely to affect the circulation of the internal liquid and may affect the function of the one-way valve 3, the guide channel 21 is set at the position of the rounded corner 201 in this embodiment. It can be understood that the rounded corner 201 can be replaced by a bevel.

[0060] In an optional embodiment, if Figure 2As shown, two battery cells 200 are installed in the shell 100 of the lithium battery 10 of this embodiment, the main body 2 is located between the two adjacent battery cells 200, and the spray part 4 is attached to one side of the two battery cells 200 along the Z direction. In this embodiment, the main body 2 is arranged between the two adjacent battery cells 200, so that it can be subjected to the squeezing force of the battery cells 200 on both sides at the same time, which can increase the amount of liquid discharged by the liquid-absorbing elastomer 1 when it is squeezed. Preferably, the main body 2 is as close to the side of the battery cell 200 with a larger area as possible so that the total volume changes more when squeezed. It can be understood that the number of battery cells 200 installed in the lithium battery 10 can be 3, 4 or more in other embodiments, so the main body 2 can also be located between multiple adjacent battery cells 200.

[0061] In an optional embodiment, if Figure 2 As shown, the top of the battery cell 200 in the Z direction of this embodiment has a clip 202 for clamping the spray portion 4. The clip 202 squeezes the spray portion 4 in the Z direction away from the battery cell 200 to ensure close contact between the spray portion 4 and the battery cell 200, facilitating spraying of the battery cell 200. This ensures that after the electrolyte reaches the space at the top of the battery cell 200, it can contact the diaphragm through the holes, thereby increasing the flow rate.

[0062] In an optional embodiment, if Figure 5 、 Figure 6 As shown, the lithium battery 10 further includes a cover plate 300, which covers one side of the open end of the housing 100 to seal the battery cell 200 and the lithium battery refilling structure within the housing 100. The cover plate 300 has a clearance groove 301 along the Z direction facing the battery cell 200. The clearance groove 301 is used to accommodate the connecting piece and tab of the lithium battery 10, as well as the spray part 4. In this embodiment, the above-mentioned design of the cover plate 300 can provide space for the spray part 4, preventing the spray part 4 from being squeezed, while also accommodating components such as the connecting piece and tab of the lithium battery 10, thereby improving space utilization.

[0063] In an optional embodiment, if Figure 5 、 Figure 6 As shown, the two spray sections 4 are spaced apart in the X direction to form a gap between them. An explosion-proof valve 302 is provided on the cover plate 300, and the position of the explosion-proof valve 302 corresponds to the position of the gap. In this embodiment, the two spray sections 4 are designed to avoid the explosion-proof valve 302, so as not to conflict with the original installation position of the explosion-proof valve 302 on the lithium battery 10.

[0064] In an optional embodiment, the main body 2 is made of elastic plastic material, and a sealed elastic plastic cavity with a thickness of 0.1 mm to 0.5 mm is formed by a blow molding process.

[0065] In an optional embodiment, the liquid-absorbing elastic body 1 is made of polyurethane foam, and a fire retardant such as chlorine, bromine and other elements is added therein to play a flame retardant role.

[0066] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations of the claims. Various modifications and variations may be made to the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form additional embodiments of the present application that may not be explicitly described. Therefore, the above embodiments merely illustrate several implementations of the present application and do not limit the scope of protection of the patent application.

Claims

1. A lithium battery refilling structure, arranged inside a housing (100) of a lithium battery (10), wherein at least a portion of the lithium battery refilling structure is attached to one side of a cell (200) of the lithium battery (10), characterized in that: include: A main body (2) comprising an inner cavity (20) and a guide flow channel (21) extending along the Z direction, wherein the main body (2) is capable of elastic deformation at the location of the inner cavity (20), the guide flow channel (21) is in communication with the inner cavity (20), and the lower end of the main body (2) along the Z direction has at least one liquid inlet (23) capable of allowing electrolyte in the housing (100) to flow into the inner cavity (20); a spray portion (4), at least one of the spray portions (4) being arranged on a side of the main body (2) facing the battery core (200) along the Z direction, and the spray portion (4) extending along the Y direction to cover the battery core (200), a spray channel (41) communicating with the guide flow channel (21) being formed in the spray portion (4), and a plurality of penetrating spray ports (42) being provided on a side of the spray portion (4) facing the battery core (200) along the Z direction, the spray ports (42) being capable of discharging electrolyte transported from the guide flow channel (21) to the spray channel (41); a liquid-absorbing elastic body (1), the liquid-absorbing elastic body (1) being arranged in the inner cavity (20), the liquid-absorbing elastic body (1) being capable of absorbing liquid and expanding, and being capable of discharging the absorbed liquid when squeezed; A one-way valve (3) is connected to the liquid inlet (23) so that the electrolyte flowing into the inner cavity (20) from the liquid inlet (23) cannot flow out from the liquid inlet (23).

2. The lithium battery rehydration structure according to claim 1, characterized in that: The two spray parts (4) are arranged along the X direction to cover a portion of the battery core (200), and the two guide flow channels (21) are arranged along the X direction on both sides of the inner cavity (20) and are respectively connected to the corresponding spray parts (4).

3. The lithium battery rehydration structure according to claim 2, characterized in that: Each of the spraying portions (4) is provided with a plurality of spraying openings (42) spaced apart along the X direction; the opening size of the spraying openings (42) gradually increases as the opening moves away from the guide flow channel (21) along the X direction.

4. The lithium battery rehydration structure according to claim 2, characterized in that: The liquid inlet (23) is arranged on both sides of the main body (2) and is in communication with the inner cavity (20) and the guide flow channel (21).

5. The lithium battery rehydration structure according to any one of claims 1 to 4, characterized in that: The one-way valve (3) includes a baffle (31), wherein the baffle (31) is hinged to the inner wall of the main body (2) along the upper edge of the Z direction. When the baffle (31) abuts against the inner bottom surface of the main body (2) along the lower edge of the Z direction, the liquid inlet (23) is closed, and the baffle (31) can move from the liquid inlet (23) toward one side of the inner cavity (20).

6. A lithium battery, characterized in that: The invention comprises a shell (100), a battery cell (200) and a lithium battery refilling structure according to any one of claims 1 to 5, wherein the battery cell (200) and the lithium battery refilling structure are arranged inside the shell (100).

7. The lithium battery according to claim 6, characterized in that The battery core (200) has rounded corners (201) or oblique angles on both sides along the X direction; along the Y direction, the projection of the guide channel (21) coincides with a portion of the projection of the rounded corners (201) or the oblique angles.

8. The lithium battery according to claim 6 or 7, characterized in that At least two battery cells (200) are installed in the housing (100), the main body (2) is located between two adjacent battery cells (200), and the spraying portion (4) is attached to one side of the two battery cells (200) along the Z direction.

9. The lithium battery according to claim 8, characterized in that The lithium battery (10) further comprises a cover plate (300), the cover plate (300) covering one side of the open end of the shell (100) to seal the battery core (200) and the lithium battery rehydration structure within the shell (100); the cover plate (300) has an air-avoidance groove (301) on one side facing the battery core (200) along the Z direction, the air-avoidance groove (301) being used to accommodate the connecting piece and the tab of the lithium battery (10), as well as the spray portion (4).

10. The lithium battery according to claim 9, characterized in that The two spraying parts (4) are spaced apart along the X direction so that a gap is formed between the two spraying parts (4); an explosion-proof valve (302) is provided on the cover plate (300), and the position of the explosion-proof valve (302) corresponds to the position of the gap.

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