Lithium battery negative electrode lithium supplement assembly and cylindrical battery

Abstract

The utility model provides a kind of lithium battery negative pole lithium supplement assembly and cylindrical battery, including shell, roll core and lithium supplement stick, the roll core is fixedly arranged in the shell, its inside is equipped with center hole;The lithium supplement stick includes containing rod, plugging head and lithium supplement agent, the containing rod is arranged in the center hole, and with the shell opposite fixed, containing groove is opened on the containing rod;The plugging head is sealed and fixed on the containing groove;The lithium supplement agent is filled and arranged in the containing groove.The utility model can carry out lithium supplement operation to electrolyte by setting lithium supplement stick in center hole, to prolong the service life of battery, by setting lithium supplement stick to include containing rod, plugging head and lithium supplement agent, lithium supplement agent is filled in containing groove, and plugging head is used to plug containing groove, lithium supplement operation can be carried out after battery is used for a period of time, avoid the problem that lithium concentration in electrolyte is too high, guarantee the overall performance of battery.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a lithium battery negative electrode lithium replenishment component and a cylindrical battery. Background Technology

[0002] During the initial charge and discharge of a lithium battery, a series of complex chemical reactions occur between the electrodes and the electrolyte solution, forming a passivation film, or SEI film, on the electrode surface. The formation of the SEI film irreversibly consumes a large number of lithium ions. At the same time, during long-term battery cycling, it further causes the loss of active lithium, thus affecting the battery's lifespan.

[0003] The lithium-ion consumption caused by the SEI film is usually addressed by replenishing lithium during the battery manufacturing stage. To address lithium-ion consumption during long-term cycling and extend battery life, corresponding lithium replenishment components are incorporated into lithium-ion batteries. For example, a battery cell disclosed in utility model publication CN220753710U features a porous central pillar within the cell's central hole. This pillar absorbs a replenishing agent, which then diffuses into the containment cavity, achieving lithium replenishment.

[0004] In the above technical solution, the porous central column has pores inside, which are used to absorb the replenishing agent. However, these pores are directly connected to the electrolyte, which can lead to an excessively high lithium-ion concentration in the electrolyte during the initial use of the battery, affecting the overall performance of the battery. Utility Model Content

[0005] In view of this, this utility model proposes a lithium battery negative electrode lithium replenishment component and a cylindrical battery, which can perform lithium replenishment operation on the battery after a period of battery use, thus ensuring the overall performance of the battery.

[0006] The technical solution of this utility model is achieved as follows: On the one hand, this utility model provides a lithium battery negative electrode lithium replenishment component, including a shell, a core, and a lithium replenishment rod, wherein,

[0007] The core is fixedly disposed inside the housing, and a central hole is provided inside it;

[0008] The lithium replenishing rod includes a receiving rod, a sealing head, and a lithium replenishing agent. The receiving rod is disposed in the central hole and fixed relative to the housing. A receiving groove is formed on the receiving rod. The sealing head is sealed and fixed on the receiving groove and can dissolve in the electrolyte in the housing. The lithium replenishing agent is filled and disposed in the receiving groove.

[0009] Based on the above technical solutions, preferably, multiple sealing heads and multiple lithium replenishing agents are provided, and the multiple sealing heads and multiple lithium replenishing agents are alternately arranged along the axial direction of the receiving tank.

[0010] More preferably, the lengths of the plurality of sealing heads along the axial direction of the receiving groove are different.

[0011] More preferably, the lengths of the plurality of lithium replenishing agents along the axial direction of the receiving tank are different.

[0012] Based on the above technical solutions, preferably, the receiving groove is formed at one end of the receiving rod.

[0013] More preferably, the end of the receiving rod away from the receiving groove is welded and fixed to the housing.

[0014] More preferably, it also includes a negative electrode tab, the two ends of which are fixedly disposed between the winding core and the housing and electrically connected thereto;

[0015] The end of the receiving rod away from the receiving groove is welded and fixed to the negative electrode tab.

[0016] Further preferred options include a negative electrode tab and a negative electrode current collector, wherein,

[0017] One end of the negative electrode tab is fixedly disposed on the winding core and electrically connected thereto;

[0018] The negative electrode current collector is fixedly disposed between the negative electrode tab and the housing and electrically connected thereto. The end of the receiving rod away from the receiving groove is welded and fixed to the negative electrode current collector.

[0019] Based on the above technical solutions, preferably, the material of the receiving rod is the same as the material of the housing.

[0020] Secondly, this utility model provides a cylindrical battery, including the aforementioned lithium battery negative electrode lithium replenishment component.

[0021] The lithium battery negative electrode lithium replenishment component and cylindrical battery of this utility model have the following advantages over the prior art:

[0022] (1) By setting a lithium replenishing rod in the center hole, lithium replenishment can be performed on the electrolyte to extend the battery's service life. By setting the lithium replenishing rod to include a receiving rod, a sealing head and a lithium replenishing agent, the lithium replenishing agent is filled into the receiving tank and the receiving tank is sealed with the sealing head. After the battery has been used for a period of time, lithium replenishment can be performed on it to avoid the problem of excessive lithium concentration in the electrolyte and ensure the overall performance of the battery.

[0023] (2) By setting multiple sealing heads and multiple lithium replenishing agents, the electrodes can be replenished with lithium in stages, thereby further improving the battery's service life and ensuring the overall performance of the battery. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a cross-sectional view of a lithium battery negative electrode lithium replenishment component according to the present invention.

[0026] Figure 2 for Figure 1 Enlarged view of point A in the image.

[0027] Figure 3 for Figure 1 Enlarged view of point B in the image.

[0028] Figure 4 This is a cross-sectional view of the receiving groove in Embodiment 2 of a lithium battery negative electrode lithium replenishment component of this utility model.

[0029] The components are: 1. Shell; 2. Core; 201. Center hole; 3. Lithium replenishing rod; 31. Receiving rod; 32. Sealing head; 33. Lithium replenishing agent; 301. Receiving tank; 4. Negative electrode tab; 5. Negative electrode current collector. Detailed Implementation

[0030] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] Example 1

[0032] This utility model discloses a cylindrical battery, including a lithium battery negative electrode lithium replenishment component. The lithium battery negative electrode lithium replenishment component includes a housing 1, a core 2, and a replenishment rod 3, which is used to realize the automatic lithium replenishment operation of the battery.

[0033] The casing 1 is the main structure of the battery, which not only provides physical support for the internal components of the battery and ensures the integrity of the overall battery structure, but also protects the various internal components of the battery from external impacts and vibrations.

[0034] The core 2 is the core component of the battery. It is made of positive electrode material, separator and negative electrode material. During the winding process of the core 2, a central hole 201 is formed in the middle. The central hole 201 is used to realize the filling of the cell and the venting. After the core 2 is wound, the core 2 is fixedly set in the housing 1.

[0035] The lithium replenishing rod 3 includes a receiving rod 31, a sealing head 32, and a lithium replenishing agent 33, such as Figure 2 As shown, the receiving rod 31 is disposed in the central hole 201 and electrically connected to the housing 1. The receiving rod 31 has a receiving groove 301, the sealing head 32 is sealed and fixed on the receiving groove 301, and the lithium replenishing agent 33 is filled and disposed in the receiving groove 301.

[0036] The plug head 32 is made of polymer materials such as PVDF (polyvinylidene fluoride), PP (polypropylene) and PE (polyethylene). After the plug head 32 has been used for a period of time, it can dissolve in the electrolyte in the shell 1, so that the lithium replenishing agent 33 in the receiving tank 301 comes into contact with the electrolyte, thereby achieving the effect of replenishing the electrolyte with lithium to cope with the consumption of lithium during battery use.

[0037] In the initial stage of battery use, the sealing head 32 seals the receiving tank 301, preventing lithium ions in the lithium replenishing agent 33 from entering the electrolyte, thus maintaining the lithium concentration in the electrolyte and ensuring the overall performance of the battery. After the battery has been used for a period of time, the sealing head 32 disappears, and the lithium replenishing agent 33 flows into the electrolyte, thereby achieving the lithium replenishment effect and restoring the battery's performance.

[0038] The dissolution time of the plug head 32 determines the lithium replenishment time of the battery. Therefore, the material of the plug head 32 and the setting length of the plug head 32 can be controlled to adjust the lithium replenishment time of the battery.

[0039] like Figure 2 As shown, the receiving groove 301 is formed at one end of the receiving rod 31, thereby making the receiving groove 301 more deep to store more lithium replenishing agent 33.

[0040] Preferably, the end of the receiving rod 31 away from the receiving groove 301 is welded and fixed to the housing 1. This not only enables electrical conduction between the receiving rod 31 and the housing 1, but also allows the two to be fixed together, thereby improving the stability of the various components inside the battery.

[0041] The material of the receiving rod 31 should be metal, and preferably the same as that of the housing 1.

[0042] Example 2

[0043] Unlike Example 1, as Figure 4As shown, multiple sealing heads 32 and lithium replenishing agents 33 are provided, and these multiple sealing heads 32 and multiple lithium replenishing agents 33 are alternately arranged along the axial direction of the receiving tank 301. After the battery has been running for a period of time, the upper sealing head 32 dissolves, and the upper lithium replenishing agent 33 replenishes lithium to the electrolyte. After another period of time, the second upper sealing head 32 dissolves, and the second upper lithium replenishing agent 33 replenishes lithium to the electrolyte. This multi-stage lithium replenishment method not only ensures the lithium concentration in the electrolyte but also extends the battery's lifespan.

[0044] To adjust the timing of each lithium replenishment, the lengths of multiple sealing heads 32 along the axial direction of the receiving tank 301 can be different; similarly, to adjust the amount of lithium replenishment each time, the lengths of multiple lithium replenishing agents 33 along the axial direction of the receiving tank 301 can be different.

[0045] Example 3

[0046] Unlike Embodiment 1, the lithium battery negative electrode replenishment assembly also includes a negative electrode tab 4. The two ends of the negative electrode tab 4 are fixedly disposed between the core 2 and the housing 1 and electrically connected thereto, while the end of the receiving rod 31 away from the receiving groove 301 is welded and fixed to the negative electrode tab 4.

[0047] Example 4

[0048] Unlike Embodiment 1, the lithium battery negative electrode replenishment assembly also includes a negative electrode tab 4 and a negative electrode current collector 5. One end of the negative electrode tab 4 is fixedly mounted on the winding core 2 and electrically connected thereto. The negative electrode current collector 5 is fixedly mounted between the negative electrode tab 4 and the housing 1 and electrically connected thereto. The end of the receiving rod 31 away from the receiving groove 301 is welded and fixed to the negative electrode current collector 5.

[0049] According to actual needs, Embodiments 1, 3 and 4 fix the receiving rod 31 in different positions so that the battery can be used in different operating conditions.

[0050] The working principle of the lithium battery negative electrode lithium replenishment component and cylindrical battery of this utility model is as follows:

[0051] In the initial stage of battery use, the sealing head 32 seals the receiving tank 301, preventing lithium ions in the lithium replenishing agent 33 from entering the electrolyte, thus maintaining the lithium concentration in the electrolyte and ensuring the overall performance of the battery. After the battery has been used for a period of time, the sealing head 32 dissolves, and the lithium replenishing agent 33 flows into the electrolyte, thereby achieving the lithium replenishment effect and restoring the battery's performance.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lithium battery negative electrode lithium replenishment component, characterized in that: Includes a housing (1), a core (2), and a lithium replenishment rod (3), wherein, The core (2) is fixedly installed inside the housing (1), and a central hole (201) is provided inside it. The lithium replenishing rod (3) includes a receiving rod (31), a sealing head (32), and a lithium replenishing agent (33). The receiving rod (31) is disposed in the central hole (201) and fixed relative to the housing (1). A receiving groove (301) is provided on the receiving rod (31). The sealing head (32) is sealed and fixed on the receiving groove (301). The sealing head (32) can dissolve in the electrolyte in the housing (1). The lithium replenishing agent (33) is filled in the receiving groove (301).

2. The lithium battery negative electrode lithium replenishment component as described in claim 1, characterized in that: Multiple plugging heads (32) and multiple lithium replenishing agents (33) are provided, and multiple plugging heads (32) and multiple lithium replenishing agents (33) are alternately arranged along the axial direction of the receiving groove (301).

3. A lithium battery negative electrode lithium replenishment component as described in claim 2, characterized in that: The lengths of the multiple sealing heads (32) along the axial direction of the receiving groove (301) are different.

4. A lithium battery negative electrode lithium replenishment component as described in claim 3, characterized in that: The lengths of the multiple lithium replenishing agents (33) along the axial direction of the receiving tank (301) are different.

5. A lithium battery negative electrode lithium replenishment component as described in claim 1, characterized in that: The receiving groove (301) is formed at one end of the receiving rod (31).

6. A lithium battery negative electrode lithium replenishment component as described in claim 5, characterized in that: The end of the receiving rod (31) away from the receiving groove (301) is welded and fixed to the housing (1).

7. A lithium battery negative electrode lithium replenishment component as described in claim 5, characterized in that: It also includes a negative electrode tab (4), the two ends of which are fixedly disposed between the core (2) and the housing (1) and electrically connected thereto; The end of the receiving rod (31) away from the receiving groove (301) is welded and fixed to the negative electrode tab (4).

8. A lithium battery negative electrode lithium replenishment component as described in claim 5, characterized in that: It also includes the negative electrode tab (4) and the negative electrode current collector (5), wherein, One end of the negative electrode tab (4) is fixedly disposed on the winding core (2) and electrically connected thereto; The negative electrode current collector (5) is fixedly disposed between the negative electrode tab (4) and the housing (1) and electrically connected thereto. The end of the receiving rod (31) away from the receiving groove (301) is welded and fixed to the negative electrode current collector (5).

9. A lithium battery negative electrode lithium replenishment component as described in claim 1, characterized in that: The material of the receiving rod (31) is the same as that of the housing (1).

10. A cylindrical battery, characterized in that: Including the lithium battery negative electrode lithium replenishment component as described in any one of claims 1-9.

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