Battery and battery pack

Abstract

The utility model provides a battery and a battery pack, and relates to the technical field of batteries. The battery comprises a shell, wherein an accommodating cavity with an opening at one end is defined by the shell; the battery cell is arranged in the accommodating cavity; the cover plate is arranged at the position of the opening in a covering mode so as to seal the containing cavity; at least one of the cover plate and the shell is provided with an active material supplementing part, the active material supplementing part is arranged close to the accommodating cavity, the active material supplementing part is provided with a filling cavity, the filling cavity is filled with a lithium supplementing agent, and the filling cavity is opened when the active material supplementing part bears preset pressure. According to the battery and the battery pack provided by the embodiment of the invention, the loss of active lithium is automatically compensated in the battery circulation process, the lithium supplementing time is ensured to be matched with the lithium consumption amount, and the lithium supplementing efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery and a battery pack. Background Technology

[0002] Lithium-ion batteries are a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution. They are widely used in portable electronic devices, electric vehicles, energy storage systems and other fields.

[0003] During the charging and discharging process, the active lithium in existing lithium-ion batteries is continuously consumed, resulting in irreversible capacity loss. As a result, the capacity of lithium-ion batteries continues to decline, making it difficult to maintain a long cycle life. Utility Model Content

[0004] This invention provides a battery and battery pack that automatically compensates for the loss of active lithium during battery cycling, ensuring that the timing of lithium replenishment matches the amount of lithium consumed and improving lithium replenishment efficiency.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] In a first aspect, embodiments of this application provide a battery, comprising:

[0007] A housing that defines a receiving cavity with an opening at one end;

[0008] A battery cell, wherein the battery cell is disposed within the receiving cavity;

[0009] A cover plate is provided over the opening to close the receiving cavity;

[0010] At least one of the cover plate and the housing is provided with an active material replenishment part, the active material replenishment part having a filling cavity filled with lithium replenishing agent, and the active material replenishment part opening the filling cavity when subjected to a preset pressure from the receiving cavity.

[0011] In one possible implementation, the cavity wall of the filling cavity is provided with a structurally weak portion, the strength of which is lower than the strength of other parts of the active material replenishment portion, and the structurally weak portion opens the filling cavity when subjected to the preset pressure.

[0012] In one possible implementation, the thickness of the structurally weak portion is less than the thickness of other portions of the active material replenishment portion.

[0013] In one possible implementation, the cavity wall of the filling cavity includes an outer surface facing the battery cell and an inner surface facing the filling cavity;

[0014] The weak point in the structure is formed by one of the inner surface and the outer surface being recessed towards the other.

[0015] In one possible implementation, the structural weak points are provided in multiple ways, and the strength of the multiple structural weak points is different.

[0016] In one possible implementation, the cavity wall of the filling cavity has a discharge port that connects the filling cavity and the receiving cavity, and the discharge port is covered with a membrane, which constitutes the weak part of the structure.

[0017] In one possible implementation, the battery further includes a puncture member disposed within the filling cavity and facing the membrane.

[0018] When subjected to the preset pressure, the membrane deforms toward the puncture member and comes into contact with the puncture member.

[0019] In one possible implementation, the puncture member is movable along the opening direction of the discharge port, and the puncture member is configured to move toward the membrane and abut against the membrane when the active material replenishment portion is subjected to a preset pressure.

[0020] In one possible implementation, the active material replenishment section is provided with a plurality of filling cavities; and / or, the active material replenishment section is provided with a plurality of cavities.

[0021] Secondly, embodiments of this application also provide a battery pack, including the battery in any of the above possible implementations.

[0022] The beneficial effects of this utility model are as follows: This application provides a battery and battery pack in which the active material replenishment section responds to the pressure change when the internal pressure changes due to lithium loss during battery cycling. When the pressure reaches a preset value, the filling chamber opens, and the lithium replenishing agent enters the cell area through the connecting path, contacts the negative electrode material, and releases active lithium, thereby compensating for capacity decay.

[0023] This achieves automatic compensation for active lithium loss during battery cycling and avoids seal damage caused by lithium replenishment operations. The lithium replenishing agent is stored inside the cover plate, without occupying space in the cell array, thus maintaining the battery's energy density. The pressure triggering mechanism is linked to the battery's operating state, ensuring that the timing of lithium replenishment matches the amount of lithium consumed, improving replenishment efficiency. The closed-loop lithium replenishing agent release process prevents external contaminants from entering the battery, ensuring electrolyte purity. Attached Figure Description

[0024] Figure 1 An exploded view of the battery provided in this application.

[0025] Figure 2 Structural diagram of the cover plate provided in this application Figure 1 ;

[0026] Figure 3 Structural diagram of the cover plate provided in this application Figure 2 ;

[0027] Figure 4 for Figure 2 A schematic diagram of the first structural type of part A;

[0028] Figure 5 for Figure 2 The second structural diagram of part A;

[0029] Figure 6 for Figure 2 A schematic diagram of the third structure in section A;

[0030] Figure 7 for Figure 2 The fourth structural diagram of part A.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100 - Housing; 110 - Receiving cavity;

[0033] 200-cell;

[0034] 300-cover plate;

[0035] 400 - Active material replenishment section; 410 - Filling cavity; 420 - Structurally weak section; 430 - Discharge port; 440 - Membrane body;

[0036] 500 - Puncture piece.

[0037] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0038] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0039] Lithium-ion batteries are a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution. They are widely used in portable electronic devices, electric vehicles, energy storage systems and other fields.

[0040] During the charging and discharging process, the active lithium in existing lithium-ion batteries is continuously consumed, resulting in irreversible capacity loss. This leads to a continuous decline in battery capacity and makes it difficult to maintain a long cycle life. Replenishing the active lithium lost during use can effectively improve the cycle life of lithium-ion batteries.

[0041] Existing lithium replenishment designs also include one approach where lithium plates are pre-embedded in the structure. However, pre-embedded lithium plates occupy a significant amount of internal space in the lithium-ion battery, reducing its energy density. Furthermore, connecting the lithium plate leads to the battery cover is difficult, and the replenishment process requires an additional charging process between the reference electrode terminal and the negative or positive terminal, further increasing the complexity of the process. In another example, replenishment can damage the battery casing, leading to insufficient sealing and increasing the risk of moisture ingress.

[0042] To address the aforementioned issues, this application provides a battery and battery pack in which the active material replenishment section responds to pressure changes caused by lithium loss during battery cycling. When the pressure reaches a preset value, the filling chamber opens, and the lithium replenishing agent enters the cell area through the connecting path, contacts the negative electrode material, and releases active lithium, thereby compensating for capacity decay.

[0043] This achieves automatic compensation for active lithium loss during battery cycling and avoids seal damage caused by lithium replenishment operations. The lithium replenishing agent is stored inside the cover plate, without occupying space in the cell array, thus maintaining the battery's energy density. The pressure triggering mechanism is linked to the battery's operating state, ensuring that the timing of lithium replenishment matches the amount of lithium consumed, improving replenishment efficiency. The closed-loop lithium replenishing agent release process prevents external contaminants from entering the battery, ensuring electrolyte purity.

[0044] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0045] The following will combine Figures 1 to 7 The embodiments of this application will be described below.

[0046] Reference Figures 1 to 3 As shown, one embodiment of this application provides a battery, including a housing 100, a battery cell 200 and a cover plate 300, wherein the housing 100 defines a receiving cavity 110 with an opening at one end; the battery cell 200 is disposed in the receiving cavity 110; and the cover plate 300 is disposed on the opening to close the receiving cavity 110.

[0047] At least one of the cover plate 300 and the housing 100 is provided with an active material replenishment part 400. The active material replenishment part 400 is located near the receiving cavity 110. The active material replenishment part 400 has a filling cavity 410, which is filled with lithium replenishing agent. The active material replenishment part 400 opens the filling cavity 410 when subjected to a preset pressure from the receiving cavity 110.

[0048] It is understood that the active material replenishment part 400 can be provided on the cover plate 300, on the housing 100, or on both the cover plate 300 and the housing 100. Optionally, when the active material replenishment part 400 is provided on the cover plate 300, the active material replenishment part 400 can be provided on the side of the cover plate 300 or on the end face of the cover plate 300 facing the receiving cavity 110.

[0049] Of course, the active material replenishment section 400 includes, but is not limited to, the listed configurations. As long as the design enables the active material replenishment section 400 to open the filling cavity 410 when subjected to a preset pressure from the self-accepting cavity 110, it is within the scope of protection of this application and is not limited here.

[0050] For example, refer to Figure 1 and Figure 2 The active material replenishment part 400 is provided on the end face of the cover plate 300 facing the receiving cavity 110.

[0051] Optionally, the cover plate 300 includes a body and an active material replenishment part 400, the active material replenishment part 400 being disposed on the side of the body facing the receiving cavity 110. Optionally, the body and the active material replenishment part 400 may be integrally molded.

[0052] Specifically, when the internal pressure changes due to lithium loss during battery cycling, the active material replenishment section 400 responds to the pressure change. When the pressure reaches a preset value, the filling chamber 410 opens, and the lithium replenishing agent enters the cell 200 area through the connecting path, contacts the negative electrode material, and releases active lithium to compensate for capacity decay.

[0053] This process is completed automatically in a closed environment, achieving self-triggering through a pressure-triggered mechanism, which simplifies the lithium replenishment process and reduces operational risks. Furthermore, the filling chamber 410 in this design retains its structural support function after release, ensuring the mechanical stability of the battery.

[0054] Thus, the battery of this application achieves automatic compensation for active lithium loss during battery cycling and avoids seal damage caused by lithium replenishment operations. The lithium replenishing agent is stored inside the cover plate 300, without occupying the space of the cell group 200, maintaining the battery energy density. The pressure triggering mechanism is linked to the battery operating state to ensure that the timing of lithium replenishment matches the amount of lithium consumed, improving lithium replenishment efficiency. The closed lithium replenishing agent release process prevents external contaminants from entering the battery, ensuring the purity of the electrolyte.

[0055] In some embodiments, combined with Figure 3 The cavity wall of the filling cavity 410 is provided with a structurally weak part 420. The strength of the structurally weak part 420 is lower than the strength of other parts of the active material replenishment part 400. The structurally weak part 420 opens the filling cavity 410 when subjected to a preset pressure.

[0056] Understandably, the structural weak point 420 has lower strength than the surrounding area and will preferentially fracture under pressure. Optionally, the thickness of the structural weak point 420 can be designed to be less than the thickness of the surrounding area.

[0057] Specifically, when the pressure inside the battery changes due to lithium-ion consumption, the active material replenishment section 400 is subjected to mechanical stress generated by the expansion of the cell 200. The structurally weak section 420, as a pre-designed mechanical weak point, preferentially fractures or deforms when the stress reaches a critical value, thereby opening the filling cavity 410. The lithium replenishing agent enters the cell 200 region through the rupture and contacts the negative electrode material to replenish the active lithium.

[0058] Thus, this design enables the controlled release of the lithium replenishing agent under preset conditions, avoiding the damage to the battery's seal caused by traditional lithium replenishment operations. Furthermore, the weakened design of the structural weak point 420 ensures that the lithium replenishment process is triggered only when the internal pressure of the battery reaches a threshold, maintaining the integrity of the battery structure while reducing the risk of premature contact between the lithium replenishing agent and the electrolyte. The lithium replenishing agent release path directly connects to the cell 200 region through a cavity wall rupture, improving the efficiency of active lithium replenishment.

[0059] In some embodiments, combined with Figure 3 and Figure 4 The thickness of the structurally weak part 420 is less than the thickness of other parts of the active material replenishment part 400.

[0060] Understandably, the thickness difference causes the structurally weak part 420 to deform or rupture preferentially when subjected to pressure, thereby opening the filling cavity 410 to release the lithium replenishing agent.

[0061] Optionally, the structurally weak part 420 can be formed into a recessed area on the cavity wall surface by stamping, or the wall thickness distribution in different areas can be controlled by injection molding.

[0062] Specifically, during battery charging and discharging, the continuous consumption of active lithium leads to capacity decay. When the internal pressure of the battery reaches a preset threshold, the active material replenishment section 400 is compressed. At this time, the structurally weak section 420 experiences a decrease in mechanical strength due to thinning, and preferentially undergoes rupture or deformation, thereby connecting the filling cavity 410 with the internal space of the battery. The lithium replenishing agent enters the cell 200 area through the ruptured part and contacts the negative electrode material to replenish the active lithium.

[0063] This design achieves a self-triggered function for the lithium replenishment structure, controlling the release of the lithium replenishing agent while maintaining battery sealing. The 420-position weak point in the structure forms a controllable rupture point through thickness differences, solving the problems of traditional pre-embedded lithium sheets occupying internal space and the complex processing of capsule-shaped structures. It also avoids damaging the battery's structural stability during traditional lithium replenishment operations. The lithium replenishing agent release process is automatically correlated with the battery's internal pressure, ensuring the timeliness and reliability of active lithium replenishment.

[0064] In some embodiments, combined with Figure 4 The cavity wall of the filling cavity 410 includes an outer surface facing the cell 200 and an inner surface facing the filling cavity 410. The structural weak part 420 is formed by one of the inner surface and the outer surface being recessed towards the other.

[0065] Optionally, the structural weak point 420 can be designed with the outer surface recessed towards the inner surface.

[0066] Specifically, the cavity wall of the filling cavity 410 is designed with recessed areas on its inner or outer surface, such that the material thickness or structural strength of these recessed areas is lower than that of the surrounding areas. When the pressure inside the battery changes due to cyclic use, the recessed areas bear concentrated stress, thus preferentially rupturing under a preset pressure threshold. In this way, this application can precisely control the timing and location of lithium replenishment release, avoiding premature leakage or insufficient release of lithium replenishment.

[0067] Optionally, the structurally weak part 420 can be integrally molded with the cavity wall, which reduces assembly complexity and ensures the reliability of the lithium replenishment structure.

[0068] In some embodiments, combined with Figure 3 There are multiple structural weak points 420, and the strength of the multiple structural weak points 420 is different.

[0069] It is understandable that the different strengths of multiple structural weak points 420 can result in different compressive strengths for different structural weak points 420.

[0070] Specifically, when the active lithium inside the cell 200 reaches different stages of depletion, the externally applied pressure can sequentially trigger the structural weak points 420 of different strengths to rupture. For example, under the first pressure, the structural weak point 420 with the lowest strength ruptures first, releasing some of the lithium replenishing agent; as the number of cycles increases, the structural weak points 420 with higher strength open sequentially under subsequent pressure triggers.

[0071] In this way, the lithium replenishing agent is released in stages, avoiding the problem of excessive replenishment or excessively high local concentration caused by a one-time release. This design can release the corresponding dose of lithium replenishing agent in stages according to the actual degree of loss of the active lithium in the 200 cells. This not only avoids material waste caused by excessive replenishment, but also maintains the lithium-ion balance in different cycle cycles, thereby effectively extending the cycle life of the battery.

[0072] In some embodiments, combined with Figure 5 The cavity wall of the filling cavity 410 is provided with a discharge port 430 that connects the filling cavity 410 and the receiving cavity 110. The discharge port 430 is covered with a membrane 440, which constitutes a structurally weak part 420.

[0073] Understandably, the discharge port 430 is a through channel located between the filling cavity 410 and the receiving cavity 110, providing a flow path for the release of lithium replenishing agent. The membrane 440 is a fractured material layer covering the surface of the discharge port 430. Optionally, the membrane 440 can be made of aluminum-plastic composite membrane, polymer film, etc.

[0074] Specifically, when the active lithium inside the battery is consumed due to cycling, the internal pressure of the cell 200 gradually increases. When the pressure reaches a preset threshold, the membrane 440 covering the discharge port 430 ruptures due to its weak structure, and the lithium replenishing agent in the filling cavity 410 enters the receiving cavity 110 through the discharge port 430 and comes into contact with the cell 200, thus replenishing the active lithium.

[0075] In this way, the lithium replenishment agent is released directionally through the discharge port 430, avoiding unnecessary contact with other components of the cell 200. In addition, the controllable rupture design of the membrane 440 ensures the reliability and timeliness of the lithium replenishment process.

[0076] In some embodiments, combined with Figure 6 The battery of this application also includes a puncture member 500, which is disposed in the filling cavity 410 and facing the membrane 440. When the membrane 440 is subjected to a preset pressure, it deforms toward the puncture member 500 and abuts against the puncture member 500.

[0077] Understandably, the puncture element 500 can be a rigid component disposed inside the filling cavity 410 with its tip pointing towards the membrane 440. Optionally, the puncture element 500 can be a metal needle, a ceramic protrusion structure, etc. It generates a puncture force by contacting the membrane 440 to break the seal of the membrane 440 and release the lithium replenishing agent.

[0078] Specifically, when the battery's internal active lithium is depleted, leading to capacity decay, a preset pressure is generated through the cell 200 and applied to the active material replenishment section 400. Under this pressure, the membrane 440 of the filling cavity 410 undergoes elastic deformation towards the puncture member 500. As the deformation increases, the membrane 440 contacts the tip of the puncture member 500, rupturing in the stress concentration area at the tip of the puncture member 500. The lithium replenishing agent in the filling cavity 410 enters the receiving cavity 110 through the discharge port 430 and contacts the cell 200, completing the replenishment of active lithium.

[0079] By integrating the puncture component 500 inside the filling cavity 410, the membrane 440 is ruptured by the gas pressure generated by the battery itself. No additional space is required and the lithium replenishment process is self-triggered. This achieves the directional and controllable release of the lithium replenishing agent under the internal pressure of the battery. While maintaining the stability and sealing of the battery structure, it completes the automatic replenishment of active lithium, thereby improving the lithium replenishment efficiency.

[0080] In some embodiments, combined with Figure 7 The puncture member 500 is movable along the opening direction of the discharge port 430. The puncture member 500 is configured to move toward the membrane 440 and abut against the membrane 440 when the active material replenishment part 400 is subjected to a preset pressure.

[0081] The movable nature of the piercing element 500 along the opening direction of the discharge port 430 means that the moving path of the piercing element 500 is consistent with the opening direction of the discharge port 430. Optionally, the movement of the piercing element 500 can be aided by the design of slide rails, guide grooves, etc., so that the piercing element 500 moves along a preset path.

[0082] The puncture member 500 is configured to move toward the membrane 440 and abut against the membrane 440 when the active material replenishment section 400 is subjected to a preset pressure. Optionally, the puncture member 500 may be linked with a pressure triggering mechanism, which may include a design such as a pressure-sensing spring. When the active material replenishment section 400 is subjected to external pressure, the puncture member 500 is displaced toward the membrane 440 by a driving force.

[0083] Specifically, when the battery loses active lithium due to cyclic charging and discharging, the cell 200 may expand in volume or experience internal pressure changes. At this time, the active material replenishment section 400 is subjected to a preset pressure, triggering the puncture member 500 to move along the opening direction of the discharge port 430. The movement of the puncture member 500 causes its tip to contact and puncture the membrane 440 covering the discharge port 430, and the lithium replenishing agent in the filling cavity 410 is released to the surface of the cell 200 through the discharge port 430, completing the replenishment of active lithium.

[0084] Thus, this solution uses the movable puncture component 500 in conjunction with pressure triggering to automatically release the lithium replenishing agent under preset pressure conditions without external intervention, ensuring the convenience of lithium replenishment and improving lithium replenishment efficiency.

[0085] In some embodiments, the active material replenishment portion 400 may be provided with a plurality of filling cavities 410. In some embodiments, refer to Figures 2 to 7 Multiple active material replenishment sections 400 may be provided.

[0086] Specifically, when the internal pressure of the cell 200 reaches a preset threshold, multiple filling cavities 410 distributed on the active material replenishment section 400 can rupture sequentially, allowing the lithium replenishing agent to be released into the cell 200 in stages.

[0087] In some examples, multiple filling cavities 410 can be arranged at intervals along the length of the cover plate 300, and each filling cavity 410 corresponds to a structural weak point 420 with different fracture strength, thereby releasing lithium replenishment at different pressure stages.

[0088] In addition, active material replenishment parts 400 can be provided at the edge and center of the cover plate 300 respectively, so that the lithium replenishment agent can uniformly cover the surface of the cell 200.

[0089] In some examples, multiple filling cavities 410 can also be arranged in a concentric ring shape, with the thinner part 420 of the filling cavity 410 near the center being more prone to fracture.

[0090] In some examples, multiple active material replenishment sections 400 are arranged in a grid pattern, with each replenishment section corresponding to a local area of ​​the cell 200 to achieve targeted lithium replenishment.

[0091] Thus, by designing a graded triggering mechanism with multiple filling cavities 410 or replenishment sections, the lithium replenishing agent can be replenished differently according to the degree of decay in different areas of the cell 200, solving the problem of localized over-deposition caused by a one-time release of the lithium replenishing agent. Uniform replenishment of active lithium is achieved through staged release and multi-point distribution. Furthermore, the filling cavity 410 is directly integrated inside the cover plate 300, improving the full utilization of space.

[0092] Another aspect of this application provides a battery pack, including the battery from any of the above embodiments. The battery pack may be an integrated power module formed by combining multiple battery cells, and the multiple batteries may be connected in series, parallel, or mixed connection.

[0093] Specifically, the battery pack contains individual battery cells with enclosed housings 100, and the cells 200 are placed inside the housings 100 and sealed by a cover plate 300. The active material replenishment section 400 on the cover plate 300 automatically opens when the internal pressure of the battery reaches a preset threshold, releasing a lithium replenishing agent to the cell 200 area. The lithium replenishing agent reacts upon contact with the negative electrode of the cell 200, replenishing the active lithium lost due to cycling, thereby restoring battery capacity. When multiple battery cells are combined into a battery pack, each cell independently triggers the lithium replenishment mechanism, ensuring the overall battery pack performance is stable. Thus, through a pressure-triggered lithium replenishment structure, self-triggered lithium replenishment is achieved while maintaining battery sealing, effectively extending the overall cycle life of the battery pack.

[0094] Finally, it should be noted that other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and alterations may be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A battery, characterized by, include: The housing (100) defines a receiving cavity (110) with an opening at one end. A battery cell (200) is disposed within the receiving cavity (110); A cover plate (300) is provided over the opening to close the receiving cavity (110). At least one of the cover plate (300) and the housing (100) is provided with an active material replenishment part (400), the active material replenishment part (400) has a filling cavity (410) filled with lithium replenishing agent, and the active material replenishment part (400) opens the filling cavity (410) when subjected to a preset pressure from the receiving cavity (110).

2. The battery of claim 1, wherein, The cavity wall of the filling cavity (410) is provided with a structurally weak part (420). The strength of the structurally weak part (420) is lower than the strength of other parts of the active material replenishment part (400). The structurally weak part (420) opens the filling cavity (410) when subjected to the preset pressure.

3. The battery of claim 2, wherein, The thickness of the structurally weak part (420) is less than the thickness of other parts of the active material replenishment part (400).

4. The battery of claim 3, wherein, The cavity wall of the filling cavity (410) includes an outer surface facing the battery cell (200) and an inner surface facing the filling cavity (410); The structural weak point (420) is formed by one of the inner surface and the outer surface being recessed toward the other.

5. The battery of claim 2, wherein, The structural weak part (420) is provided in multiple ways, and the strength of the multiple structural weak parts (420) is different.

6. The battery according to claim 2, characterized in that, The cavity wall of the filling cavity (410) is provided with a discharge port (430) that connects the filling cavity (410) and the receiving cavity (110). The discharge port (430) is covered with a membrane (440), and the membrane (440) constitutes the weak part (420) of the structure.

7. The battery according to claim 6, characterized in that, Also includes: A puncture element (500) is disposed within the filling cavity (410) and oriented towards the membrane body (440). When subjected to the preset pressure, the membrane (440) deforms toward the puncture member (500) and comes into contact with the puncture member (500).

8. The battery of claim 7, wherein, The puncture member (500) is movable along the opening direction of the discharge port (430), and the puncture member (500) is configured to move toward the membrane (440) and abut against the membrane (440) when the active material replenishment part (400) is subjected to a preset pressure.

9. The battery of any one of claims 1-7, wherein, The active material replenishment section (400) is provided with a plurality of filling cavities (410); and / or, the active material replenishment section (400) is provided with a plurality of cavities.

10. A battery pack, characterized in that, The battery includes any one of claims 1-9.

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