Battery cell with liquid supplementing device

Abstract

The utility model discloses a battery monomer with liquid supplementing device, including roll core and first liquid supplementing box, the first accommodating groove is seted up on the upper end surface of roll core, and the first accommodating groove is closed groove body, first liquid supplementing box fixedly connected on the first accommodating groove, and the upper end surface of first liquid supplementing box is no higher than the end surface height of roll core, the bottom surface of first liquid supplementing box is provided with liquid outlet, and the pressure valve is fixedly seted up on the liquid outlet. The utility model discloses through setting up accommodating groove on roll core, and the liquid supplementing box with pressure valve is fixed on roll core, and the electrolyte in the battery interior is decomposed and consumed constantly, and this can lead to the pressure increase in the battery interior, and the pressure valve of liquid supplementing box opens at this moment, and the electrolyte in liquid supplementing box flows to accommodating groove, and then completes the liquid supplementing to the battery interior. Compared with the traditional liquid supplementing mechanism on the battery shell, the utility model also guarantees the integrity of battery shell, and will not affect the strength of battery shell.

Description

Technical Field

[0001] This utility model relates to the field of battery electrolyte replenishment technology, and in particular to a battery cell with an electrolyte replenishment device. Background Technology

[0002] Currently, power batteries are gradually becoming the mainstream product in the new energy industry due to their advantages such as high energy density, good capacity consistency, and ability to support high-rate charging and discharging. However, power batteries experience significant electrolyte loss during high-rate charging and discharging. To maintain a stable cycle life in the later stages of battery life, it is necessary to have sufficient electrolyte inside the battery. As the battery is used and cycled, the electrolyte inside the battery is continuously decomposed and consumed in the later stages of the cycle, causing some active materials in the cell to be unable to obtain electrolyte, resulting in a large-scale decrease in battery capacity and a reduced lifespan.

[0003] In the prior art, a liquid replenishment mechanism is set on the battery casing to replenish the battery. However, setting a liquid replenishment mechanism on the battery casing will affect the overall structure of the battery, the strength of the battery casing and the overall safety of the battery. Utility Model Content

[0004] The purpose of this invention is to provide a battery cell with a liquid replenishment device that can meet the liquid replenishment requirements of the battery without changing the integrity of the battery casing.

[0005] The technical solution adopted in this utility model is as follows: A battery cell with a liquid replenishment device includes a winding core and a first liquid replenishment box. A first receiving groove is formed on the upper end face of the winding core. The first receiving groove is a closed groove, that is, the first receiving groove has no through openings on its side walls. The first liquid replenishment box is fixedly connected to the first receiving groove. The upper end face of the first liquid replenishment box is not higher than the end face of the winding core. The lower end face of the first liquid replenishment box is in contact with the bottom of the first receiving groove. The liquid replenishment box has a hollow structure for storing liquid replenishing agent. A liquid outlet is provided on the bottom surface of the first liquid replenishment box, and a pressure valve is fixedly installed on the liquid outlet.

[0006] A second receiving groove is also provided on the lower end face of the core, and the second receiving groove is also a closed groove; a second liquid replenishment box with a pressure valve is also provided in the second receiving groove, and a liquid outlet is provided on the top surface of the second liquid replenishment box, which is in contact with the bottom of the second receiving groove, and a pressure valve is also fixedly provided on the liquid outlet.

[0007] The core includes a first current collector, a second current collector, and a diaphragm. Several grooves of the same size are distributed on the middle part of the top end of the first current collector and the bottom end of the second current collector. The spacing between adjacent grooves is linearly varied so that the grooves are adjacent to each other after winding. The top groove of the first current collector forms a first receiving groove, and the bottom groove of the second current collector forms a second receiving groove.

[0008] The first and second replenishment boxes are made of the same material as the second manifold, and the first and second replenishment boxes are installed in their respective receiving tanks by welding.

[0009] There are multiple liquid outlets, and the number of pressure valves is matched accordingly.

[0010] There are multiple first and / or second receiving slots, and the multiple first or second receiving slots are evenly distributed at the top and bottom of the core.

[0011] This invention utilizes a receiving groove created on the battery core to fix a replenishing box with a pressure valve onto the core. As the electrolyte inside the battery is continuously decomposed and consumed, the internal pressure increases. At this point, the pressure valve of the replenishing box opens, allowing the electrolyte in the box to flow out into the receiving groove, thus completing the replenishment of electrolyte into the battery. Furthermore, in this application, the installed replenishing box does not affect the external structure of the battery core, ensuring the battery's shape and facilitating battery assembly. Compared to traditional methods of creating a replenishing mechanism on the battery casing, this invention also ensures the integrity of the battery casing and does not affect its strength. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a cross-sectional view of the present invention; Figure 2 This is a top view of the unfolded core of this utility model; Figure 3 This is a schematic diagram of the structure of the second fluid replenishment box of this utility model; Figure 4 This is an unfolded side view of the second current collector of this utility model; Figure 5 This is a bottom view of the present invention. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] like Figure 1 , 2 As shown in Figures 3 and 4, this utility model includes a core 1 and a first electrolyte replenishment box. A first receiving groove 4 is provided on the upper end surface of the core 1. The first receiving groove 4 is a closed groove, that is, the first receiving groove 4 has no openings penetrating the side wall. It does not penetrate the positive and negative electrodes of the battery cell. During electrolyte replenishment, the electrolyte can be reduced from flowing into the space between the battery cell 1 and the casing 8 or into the central hole of the battery cell during the liquid immersion process, thereby improving the efficiency of electrolyte replenishment and thus improving the battery capacity and cycle life.

[0016] The first replenishing box is fixedly connected to the first receiving groove 4. The upper end of the first replenishing box is not higher than the end face of the core 1 it is located on, and the lower end of the first replenishing box is in contact with the bottom of the first receiving groove 4. The first replenishing box is a hollow structure for storing replenishing agent. The bottom surface of the first replenishing box is provided with a liquid outlet, and a pressure valve 9 is fixedly installed on the liquid outlet. A second receiving groove is also provided on the lower end surface of the core. The second receiving groove is also a closed groove. A second replenishing box 7 with a pressure valve is also provided in the second receiving groove. The top surface of the second replenishing box 7 is provided with a liquid outlet, which is in contact with the bottom of the second receiving groove. A pressure valve 9 is also fixedly installed on the liquid outlet. This invention achieves its intended function by directly setting a closed tank on the upper and lower surfaces of the battery cell, and then installing a liquid replenishment box with a pressure valve inside the tank. This allows the battery structure to remain unchanged while simultaneously providing a liquid replenishment function. The pressure valve inside the liquid replenishment box senses the pressure changes inside the battery cell caused by insufficient liquid after battery use and automatically opens according to the set pressure to replenish the battery cell. Furthermore, the electrolyte in this invention directly contacts the battery cell through the tank, without penetrating the positive and negative terminals of the battery cell. The electrolyte directly contacts the exposed part inside the battery cell, forming the bottom of the tank, thus greatly improving the efficiency of liquid replenishment.

[0017] The core includes a first current collector 3, a second current collector 5, and a diaphragm 2. Several identically sized grooves are distributed on the middle portion of the top end of the first current collector 3 and the bottom end of the second current collector 5. The spacing between adjacent grooves varies linearly, ensuring that the grooves are sequentially adjacent after winding. The top groove of the first current collector forms a first receiving groove, and the bottom groove of the second current collector forms a second receiving groove. Using a grooving method allows for component adjustment before core production without adding complex process steps. In practical use, the required receiving groove structure can also be formed by milling after core winding. However, the latter may cause stress changes on the end face of the battery cell, which is detrimental to subsequent electrolyte replenishment.

[0018] The first electrolyte replenishment box and the first current collector are made of the same material, and the second electrolyte replenishment box 7 is made of the same material as the second current collector 5. This prevents safety issues from occurring with the battery cell. The first and second electrolyte replenishment boxes 7 are welded into their respective receiving slots. Welding is a convenient and quick method, and it provides a secure fixation without the need for additional connecting fasteners.

[0019] The number of the first and second rehydration boxes is multiple, such as... Figure 5 As shown, multiple settings can be evenly distributed, further improving the efficiency of fluid replenishment.

[0020] The device has multiple liquid outlets, and a corresponding number of pressure valves 9 are provided to match them. By providing multiple liquid outlets, the need for efficient liquid replenishment can be met. When the core volume is large, the volume of the liquid replenishment box can also be designed to be larger, and in this case, multiple liquid outlets can meet the need for rapid liquid replenishment.

[0021] This invention utilizes a first and a second receiving groove on the upper and lower ends of the battery core, respectively. A replenishment box with a pressure valve is fixed within these grooves, ensuring that the replenishment box does not affect the battery core structure. Furthermore, during operation, as the electrolyte inside the battery is continuously decomposed and consumed, the internal pressure increases. At this point, the pressure valve of the replenishment box opens, allowing the electrolyte to flow into the receiving groove, thus replenishing the battery's internal electrolyte. Moreover, in this application, the installed replenishment box does not affect the external structure of the battery core, preserving the battery's shape and facilitating battery assembly. Compared to traditional methods of adding a replenishment mechanism to the battery casing, this invention also ensures the integrity of the battery casing and does not compromise its strength.

[0022] In the description of this invention, it should be noted that for directional terms, such as "center," "lateral," and "vertical," the appropriate terms may be used. The directions and positional relationships indicated by symbols such as "direction", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present invention.

[0023] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0024] Note that the above description is merely a preferred embodiment and application of the technical principles of the present invention. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the specific embodiments described herein, and may include many other effective embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery cell with a liquid replenishment device, characterized in that: The device includes a core and a first replenishing box. A first receiving groove is formed on the upper surface of the core. The first receiving groove is a closed groove, meaning that there is no through opening on the side wall of the first receiving groove. The first replenishing box is fixedly connected to the first receiving groove. The upper surface of the first replenishing box is not higher than the end face of the core. The lower surface of the first replenishing box is in contact with the bottom of the first receiving groove. The replenishing box has a hollow structure for storing replenishing agent. A liquid outlet is provided on the bottom surface of the first replenishing box, and a pressure valve is fixedly installed on the liquid outlet.

2. The battery cell with a liquid replenishment device according to claim 1, characterized in that: A second receiving groove is also provided on the lower end face of the core, and the second receiving groove is also a closed groove; a second liquid replenishment box with a pressure valve is also provided in the second receiving groove, and a liquid outlet is provided on the top surface of the second liquid replenishment box, which is in contact with the bottom of the second receiving groove, and a pressure valve is also fixedly provided on the liquid outlet.

3. The battery cell with a liquid replenishment device according to claim 1, characterized in that: The core includes a first current collector, a second current collector, and a diaphragm. Several grooves of the same size are distributed on the middle part of the top end of the first current collector and the bottom end of the second current collector. The spacing between adjacent grooves is linearly varied so that the grooves are adjacent to each other after winding. The top groove of the first current collector forms a first receiving groove, and the bottom groove of the second current collector forms a second receiving groove.

4. The battery cell with a liquid replenishment device according to claim 1, characterized in that: The first and second replenishment boxes are made of the same material as the second manifold, and the first and second replenishment boxes are installed in their respective receiving tanks by welding.

5. The battery cell with a liquid replenishment device according to any one of claims 1-4, characterized in that: There are multiple liquid outlets, and the number of pressure valves is matched accordingly.

6. The battery cell with a liquid replenishment device according to claim 5, characterized in that: There are multiple first and / or second receiving slots, and the multiple first or second receiving slots are evenly distributed at the top and bottom of the core.

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