Battery case and secondary battery

Abstract

The utility model provides a kind of electric core shell and secondary battery, the inside of electric core shell forms the accommodation cavity for accommodating electric core;Electric core shell is equipped with liquid injection hole;The inner wall of electric core shell is equipped with multiple first passageways arranged at intervals, at least one first passageway is communicated with liquid injection hole, at least one first passageway is communicated with accommodation cavity;The inner wall of electric core shell is also provided with at least one second passageway, second passageway is arranged between two adjacent first passageways, and respectively with two adjacent first passageways communication.The first passageway is used to guide the electrolyte newly injected to flow from liquid injection hole to accommodation cavity, and the second passageway enables electrolyte to flow between multiple first passageways, thereby forming eddy current, to promote the mixing of new and old electrolyte.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cell casing and a secondary battery. Background Technology

[0002] A battery consists of a casing and internal cells. The cells are immersed in an electrolyte solution. Lithium ions move between the positive and negative electrodes of the cells through the electrolyte, completing the charge-discharge cycle. Towards the end of the cycle, the amount of active material inside the battery decreases, and the electrolyte performance deteriorates, leading to a significant performance degradation. At this point, injecting lithium replenishing agents and fresh electrolyte to replace the lithium ions lost during cycling can effectively restore battery performance and extend its lifespan.

[0003] However, directly injecting new electrolyte often leads to uneven distribution of lithium content between the old and new electrolytes inside the battery, affecting the effective transport of lithium ions and the recovery of battery performance. Utility Model Content

[0004] This utility model provides a cell casing and a secondary battery to solve the problem in related technologies where direct injection of new electrolyte leads to uneven distribution of lithium content between the old and new electrolytes inside the battery.

[0005] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0006] In a first aspect, the present invention provides a battery cell housing, wherein a receiving cavity for accommodating the battery cell is formed inside the battery cell housing;

[0007] The battery cell housing is provided with a liquid injection hole;

[0008] The inner wall of the battery cell housing is provided with a plurality of spaced first channels, at least one of the first channels is connected to the liquid injection hole, and at least one of the first channels is connected to the receiving cavity;

[0009] The inner wall of the battery cell housing is also provided with at least one second channel, which is disposed between two adjacent first channels and is connected to the two adjacent first channels respectively.

[0010] Optionally, the battery cell housing includes a bottom plate, a side plate, and a top cover, wherein the bottom plate, the side plate, and the top cover enclose a cavity for accommodating the battery cell;

[0011] The side plate is arranged around the outer periphery of the top cover, and the first channel extends around the inner peripheral surface of the side plate. The first channel includes a top channel near the top cover and a bottom channel near the bottom plate, and the top channel communicates with the bottom channel.

[0012] Optionally, the side panel includes a plurality of sub-side panels connected in sequence, each of the sub-side panels being arranged around the outer periphery of the top cover, and the first channel including inclined channels disposed on the plurality of sub-side panels, wherein the inclined channels on two adjacent sub-side panels are connected.

[0013] The angle between the inclined channel on each of the sub-side plates and the base plate is 15°-45°.

[0014] Optionally, each of the sub-side panels includes a plurality of the inclined channels, and the plurality of inclined channels are arranged in parallel.

[0015] The inclined channel near the base plate is the bottom channel, and the side plate is provided with a plurality of bottom channels in the circumference, with each sub-side plate having a bottom channel.

[0016] Optionally, a plurality of second channels are provided between two adjacent first channels, and the plurality of second channels are distributed at intervals along the extension direction of the first channels.

[0017] Optionally, between two adjacent first channels, the extension directions of the plurality of second channels may be the same or different.

[0018] Optionally, the first channel and the second channel include recessed structures disposed on the inner wall of the side plate.

[0019] Optionally, the first channel and the second channel include pipes disposed on the inner wall of the side plate.

[0020] Optionally, the outer wall of the side plate is provided with reinforcing ribs, and the extending direction of the reinforcing ribs intersects with the extending direction of the first channel.

[0021] Secondly, this utility model provides a secondary battery, including any of the cell casings disclosed in the first aspect.

[0022] This invention provides a battery cell housing and a secondary battery. A first channel and a second channel are provided on the inner wall of the battery cell housing. The first channel communicates with an injection hole to guide newly injected electrolyte from the injection hole cavity, allowing it to mix evenly with the remaining old electrolyte in the battery cell housing. The second channel is positioned between two adjacent first channels, enabling the electrolyte to flow between multiple first channels, thereby forming a vortex and further promoting the mixing of new and old electrolytes. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of a battery cell housing provided in an embodiment of the present invention;

[0024] Figure 2 express Figure 1A schematic diagram of the first channel in the battery cell casing shown;

[0025] Figure 3 This is a schematic diagram showing the overall structure of a battery cell housing provided in an embodiment of the present invention.

[0026] Figure label:

[0027] 10: Base plate; 20: Side plate; 21: First channel; 211: Top channel; 212: Bottom channel; 213: Inclined channel; 22: Second channel; 23: Reinforcing rib; 30: Top cover; 40: Injection hole. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0030] The cell casing is used to house the cell and electrolyte. During use, the cell undergoes a series of reactions such as lithium ion deposition and electrolyte decomposition. The cell volume expands with the number of cycles. When the cell reaches the end of the cycle, the expanded cell basically fills the gap between the cell and the side wall of the cell casing, making it difficult for the newly added electrolyte to flow and wet the cell and mix evenly with the old electrolyte, thus affecting the battery performance.

[0031] To address the aforementioned problems, this utility model provides a battery cell housing. The battery cell housing has an internal cavity for accommodating the battery cell, and an injection hole 40 is provided on the battery cell housing. The inner wall of the battery cell housing has multiple spaced-apart first channels 21, at least one of which communicates with the injection hole 40 (it can be understood that one or more first channels 21 can communicate with the injection hole 40, or each first channel 21 can communicate with the injection hole 40). At least one first channel 21 also communicates with the cavity (it can be understood that one or more first channels 21 can communicate with the cavity, or each first channel 21 can communicate with the injection hole). The inner wall of the battery cell housing also has at least one second channel 22, which is located between two adjacent first channels 21 and communicates with each of the two adjacent first channels 21.

[0032] It is understood that the inner wall of the cell housing has multiple first channels 21 and second channels 22. The second channels 22 are located between adjacent first channels 21, so that the adjacent first channels 21 are connected, and all first channels 21 are connected as a whole. This helps the electrolyte injected from the injection hole 40 to disperse and flow to each first channel 21. The electrolyte is injected into the receiving cavity through the first channels 21, which helps the electrolyte to be distributed in the receiving cavity and promotes the mixing of new and old electrolytes.

[0033] In one embodiment, such as Figure 1 As shown, the battery cell housing includes a bottom plate 10, a side plate 20, and a top cover 30. The bottom plate 10, side plate 20, and top cover 30 enclose a cavity for accommodating the battery cell and electrolyte. The top cover 30, bottom plate 10, or side plate 20 is provided with an injection hole 40. The inner wall of the side plate 20 is provided with a plurality of spaced first channels 21, which are used to inject electrolyte injected from the injection hole 40 into the cavity. The inner wall of the side plate 20 is also provided with at least one second channel 22, which is disposed between two adjacent first channels 21 and communicates with the two adjacent first channels 21 respectively.

[0034] In this embodiment, an injection hole 40 is provided on the surface of the cell housing. The injection hole 40 communicates with the first channel 21. Multiple parallel first channels 21 are evenly distributed circumferentially on the inner wall of the side plate 20, extending from one end of the side plate 20 near the top cover 30 to the other end near the bottom plate 10, surrounding the side of the cell. This allows the electrolyte injected from the injection hole 40 to be evenly distributed along the first channel 21 to various positions on the side plate 20, completely immersing the cell inside the cell housing. Due to the provision of the first channel 21 for flow guidance, the electrolyte flow trajectory is more regular, which can accelerate the electrolyte injection speed.

[0035] At least one second channel 22 is provided between two adjacent first channels 21. Understandably, the second channel 22 intersects with the first channel 21, and the multiple first channels 21 and multiple second channels 22 form interlaced liquid channels on the inner wall of the side plate 20. These interlaced liquid channels allow for the flow and exchange of electrolyte in each first channel 21. Furthermore, the different flow directions of the electrolyte in the first channels 21 and second channels 22 allow for the formation of turbulence or eddies when electrolytes flowing in different directions mix together, making it easier to achieve uniform mixing.

[0036] In practical applications, an external drive device can be used to control the rotation of the battery cell casing, and the centrifugal force during rotation further promotes the mixing of the electrolyte. The battery cell casing, after being injected with electrolyte, is placed on the rotating platform of the drive device. The rotating platform can be set at an angle, causing the battery cell casing to tilt relative to the horizontal plane. The rotating platform rotates slowly, and under the action of gravity and centrifugal force, the injected new electrolyte flows along the first channel 21 and the second channel 22 on the inner wall of the battery cell casing, stirring and exchanging with the existing electrolyte, thereby achieving uniform mixing of the old and new electrolytes. It is important to note that the rotation speed of the battery cell casing should not be too high to prevent damage to the internal structure of the battery cell.

[0037] Furthermore, different types of batteries have different structures and manufacturing processes. Therefore, the electrolyte injection hole 40 of the cell casing can be located at any position on the top cover 30, side plate 20, and bottom plate 10, depending on the type of battery. Electrolyte is injected into the receiving cavity inside the cell casing through the electrolyte injection hole 40. For cylindrical batteries, the electrolyte injection hole 40 is usually located at the edge of the top cover 30 or bottom plate 10 of the cell casing; for prismatic batteries, the electrolyte injection hole 40 is generally located at the edge of the top cover 30, near the terminal post or explosion-proof valve; for pouch batteries, the electrolyte injection hole 40 is usually located at the reserved notch on the side or top sealing edge of the battery.

[0038] When the injection hole 40 is located on the top cover 30, there is a gap between the cell and the top cover 30 reserved for the encapsulation of the cell head (that is, a gap for fluid flow is formed between the cell and the top cover 30, the injection hole 40 is connected to the gap, the first channel 21 is connected to the gap, and the connection between the injection hole 40 and the first channel 21 is achieved through the gap), providing space for the injected electrolyte to flow. The electrolyte can flow along the surface of the cell to the edge and flow into the first channel 21 on the side plate 20. Under the action of gravity, it flows from the top of the cell housing to the bottom along the first channel 21 and the second channel 22. When the injection hole 40 is located on the side plate 20 or the bottom plate 10, the injection hole 40 should be positioned at the edge of the side plate 20 or the bottom plate 10 where there is a gap between it and the battery cell. This prevents the expanded battery cell from sticking tightly to the injection hole 40 and affecting the electrolyte injection speed. During injection, the battery can be placed upside down or tilted at the injection station, and the electrolyte can be injected through the injection hole 40. This avoids adding an injection hole 40 on the top of the battery, reducing the risk of damage to the terminals and sealing structure. In this embodiment, the position of the injection hole 40 can be set on the top cover 30, the side plate 20, or the bottom plate 10 as needed, as long as there is a gap between it and the battery cell, allowing the electrolyte to flow into the flow space of the first channel 21.

[0039] In some other embodiments, a pipe can be provided between the injection hole 40 and the first channel 21 so that the electrolyte flows into the first channel 21 through the pipe. In this way, even if the injection hole 40 is located in the position where the expanded battery cell is in close contact, the electrolyte can be introduced into the first channel 21 relatively smoothly.

[0040] It should be noted that the position of the injection hole 40 in this embodiment does not affect the distribution and mixing of the electrolyte. In traditional cell casings with smooth inner walls, the content of new electrolyte is higher near the injection hole 40 and lower further away, resulting in uneven distribution of new and old electrolyte within the cell casing. This necessitates a longer mixing time after electrolyte injection to ensure uniform lithium ion distribution. In this embodiment, the various first channels 21 are connected via second channels 22. Even if the injection hole 40 is located at the edge of the top cover 30 or side plate 20, or if the injection hole 40 is only directly connected to some of the first channels 21 while other first channels 21 are indirectly connected to the injection hole 40 via second channels 22, the content of new electrolyte flowing into each first channel 21 varies considerably. Liquid exchange can also occur between the first channels 21 via second channels 22, effectively reducing the lithium ion concentration difference within each first channel 21 and ensuring uniform lithium ion distribution inside the battery.

[0041] This embodiment provides a cell housing that promotes uniform electrolyte mixing. The cell housing is made of high-strength aluminum alloy, possessing excellent corrosion resistance and lightweight characteristics. Furthermore, precise machining processes ensure the overall strength and sealing performance of the cell housing. Unlike conventional cell housings, the cell housing in this embodiment features a first channel 21 extending from the top to the bottom of the cell housing at regular intervals on its inner wall. These first channels 21 are connected by second channels 22. These flow channels are uniformly distributed along the circumference of the cell, forming a series of staggered patterns to facilitate electrolyte flow and mixing.

[0042] When a battery reaches the end of its cycle and its performance significantly declines, maintenance personnel can use a specialized lithium replenishment and electrolyte injection tool to precisely add the required amount of new electrolyte containing lithium replenishment agent into the cell through the injection hole 40 on the cell casing. Subsequently, an external drive device slowly rotates the cell within a fixed angle range. During rotation, the new electrolyte flows along the grooves on the inner wall of the cell casing under the influence of gravity and centrifugal force, violently agitating and exchanging with the existing electrolyte, thus achieving a uniform mixture of old and new electrolytes. This ensures a uniform distribution of lithium ions inside the battery after adding the new electrolyte, improving the utilization efficiency of the lithium source. A uniformly distributed electrolyte helps improve the electrochemical environment inside the battery, reducing polarization and thus improving the battery's charge / discharge efficiency and cycle stability. By regularly replenishing the lithium source and promoting uniform electrolyte mixing, the capacity decay caused by lithium loss can be effectively mitigated, extending the overall battery life.

[0043] The cell casing in this embodiment is mainly used to replenish new electrolyte in batteries that have reached the end of their cycle life, mixing the old and new electrolytes evenly to improve battery life. It can also be used for the initial injection of electrolyte into new batteries. All related equipment requiring electrolyte injection and mixing can utilize the cell casing disclosed in this embodiment.

[0044] In some alternative embodiments, the side plate 20 is arranged around the outer periphery of the top cover 30, and the first channel 21 extends around the inner peripheral surface of the side plate 20. The first channel 21 includes a top channel 211 near the top cover 30 and a bottom channel 212 near the bottom plate 10, and the top channel 211 and the bottom channel 212 are in communication.

[0045] like Figure 2As shown, the first channel 21 includes a top channel 211 and a bottom channel 212, extending from the top of the side plate 20 to the bottom of the side plate 20 and is inclined, so that the first channel 21 spirals along the circumference of the side plate 20, forming a spiral channel covering the entire inner wall of the side plate 20 of the cell housing. The spiral first channel 21 can prolong the flow time of the electrolyte, increase the contact area, and achieve a longer flow path in a limited space. When the liquid flows in the spiral first channel 21, it is subjected to centrifugal force, which promotes interlayer shear and convection, which is beneficial to the uniform mixing of new and old electrolytes.

[0046] Furthermore, when the cell housing is driven to rotate by an external drive device, the spirally inclined first channel 21 improves the rotation and mixing effect of the electrolyte. The external drive device slowly rotates the cell housing within a fixed angle range, allowing the electrolyte to rotate within the inclined first channel 21. Combined with the second channel 22 connecting to the first channel 21, the electrolyte forms a vortex during rotation. Under the influence of gravity and centrifugal force, a stirring effect is generated between the new and old electrolytes, thereby achieving uniform mixing of the new and old electrolytes.

[0047] In one embodiment, the cross-section of the side plate 20 can be circular, polygonal, or a shape formed by curves and straight lines, etc., and can be flexibly selected according to the type of battery. For example, the cross-section of the side plate 20 of a cylindrical battery is circular, and the cross-section of the side plate 20 of a prismatic battery is rectangular. Various shapes can be formed on the side plates 20 with different cross-sections. Figure 2 The method shown can set an inclined spiral first channel 21, which can promote electrolyte mixing. The type of battery and the shape of the side plate 20 do not affect the formation of a spiral channel on the inner wall of the side plate 20 by the inclined first channel 21.

[0048] In some optional embodiments, the side plate 20 includes a plurality of sub-side plates connected in sequence, each sub-side plate being arranged around the outer periphery of the top cover 30, and the first channel 21 includes an inclined channel 213 disposed on the plurality of sub-side plates, wherein the inclined channels 213 on two adjacent sub-side plates are connected, wherein the angle between the inclined channel 213 on each sub-side plate and the bottom plate 10 is 15°-45°.

[0049] like Figure 1As shown, this embodiment uses a polygonal side plate 20, which is composed of multiple sub-side plates connected sequentially. The first channel 21 is divided into multiple continuous inclined channels 213 on the multiple sub-side plates. The angle between each inclined channel 213 and the bottom plate 10 is the same, and the angle α ranges from 15° to 45°. The inclined angle within the above range helps to reduce the resistance to electrolyte flow, improve the smoothness of electrolyte flow, improve mixing efficiency, reduce local liquid accumulation, and extend the flow path and flow time of electrolyte. In addition, the electrolyte in each first channel 21 is difficult to exchange through the second channel 22. When rotating the battery cell housing to promote mixing, an excessively large inclined angle also makes it difficult for the electrolyte to rotate and form eddies, affecting the mixing effect.

[0050] Correspondingly, in some other embodiments, when the cross-section of the side plate 20 is circular, there is only one side plate 20 and there are no multiple sub-side plates. In this case, the first channel 21 is continuously inclined on the side plate 20, and the included angle between the first channel 21 and the bottom plate 10 is also 15°-45°.

[0051] In some optional embodiments, each sub-side plate includes a plurality of inclined channels 213, which are arranged in parallel; the inclined channel 213 near the bottom plate 10 is a bottom channel 212, and the side plate 20 is provided with a plurality of bottom channels 212 in the circumferential direction, and each sub-side plate is provided with a bottom channel 212.

[0052] The bottom channels 212 of the multiple first channels 21 are evenly distributed on the multiple sub-side plates, so that the electrolyte flows evenly from the first channels 21 on the side plate 20 to various positions on the bottom plate 10, thereby improving the mixing efficiency and avoiding different flow rates of electrolyte at different positions on the bottom plate 10, thus avoiding concentration differences.

[0053] Furthermore, a third channel can be provided on the base plate 10. The third channel extends from the edge of the base plate 10 to the center of the base plate 10. The electrolyte flowing along the first channel 21 on the side plate 20 to the base plate 10 enters the third channel and converges from the periphery of the base plate 10 to the center of the base plate 10, so that the electrolyte can be wetted together with the bottom of the cell, thereby improving the wetting efficiency.

[0054] In some optional embodiments, a plurality of second channels 22 are provided between two adjacent first channels 21, and the plurality of second channels 22 are distributed at intervals along the extension direction of the first channel 21.

[0055] like Figure 1As shown, multiple second channels 22 are provided between every two adjacent first channels 21. The first channel 21 extends from the side of the side plate 20 near the top cover 30 to the side near the bottom plate 10. The multiple second channels 22 are distributed at intervals along the extension direction of the first channel 21, so that the second channels 22 are evenly distributed at different positions on the top and bottom of the side plate 20, so that the new and old electrolytes can be mixed more evenly, ensuring the uniform distribution of lithium ions inside the battery.

[0056] In one embodiment, the first channel 21 and the second channel 22 are equidistantly distributed. A first channel 21 is designed every 1 cm from top to bottom on the side plate 20, and a second channel 22 is designed every certain distance between every two first channels 21, so that a uniform and interwoven network of liquid channels is formed on the inner wall of the side plate 20, and the electrolyte flow and mixing at different positions in the cell housing are consistent, avoiding the formation of local concentration differences.

[0057] In some alternative embodiments, the extension directions of the plurality of second channels 22 between two adjacent first channels 21 may be the same or different.

[0058] When the second channels 22 are oriented in the same direction, directional flow of the electrolyte can be achieved, accelerating the wetting efficiency of a specific area. However, when the second channels 22 are oriented in different directions, the flow state of the electrolyte can be made more complex, which is conducive to the formation of turbulence and further improves the mixing effect.

[0059] In some optional embodiments, the first channel 21 and the second channel 22 are recessed structures provided on the inner wall of the side plate 20, the recess depth of the first channel 21 is D1, the recess depth of the second channel 22 is D2, and 0.25mm≤D2<D1≤0.5mm.

[0060] In this embodiment, both the first channel 21 and the second channel 22 are open recessed structures on the inner wall of the side plate 20. Specifically, the first channel 21 and the second channel 22 can be grooves, and the cross-section of the grooves can be circular, square, or irregular in shape. The first channel 21 and the second channel 22 are exposed in the receiving cavity inside the cell housing. After the battery reaches the end of its life cycle, the expanded cell adheres tightly to the inner wall of the side plate 20, forming a closed flow channel on the surface of the recessed structure on the inner wall of the side plate 20. This allows the electrolyte injected from the injection hole 40 to flow along the first channel 21 and the second channel 22 to various positions on the side plate 20, and finally collect on the bottom plate 10. When the electrolyte in the first channel 21 and the second channel 22 flows along the recessed first channel 21 and the second channel 22 on the inner surface of the side plate 20, it comes into uniform contact with the outer surface of the cell, allowing for uniform wetting during the injection process and improving wetting efficiency.

[0061] The recess depth of the first channel 21 and the second channel 22 directly affects the flow capacity of the electrolyte within the channels. A greater recess depth facilitates electrolyte flow. The depth can be flexibly designed based on the thickness of the side plate 20 to maximize the drainage effect of the first channel 21 and the second channel 22 without compromising the structural strength of the cell casing. In practical applications, the thickness of the side plate 20 of the cell casing is typically 0.5mm-1.8mm. Therefore, based on the thickness of the side plate 20, the recess depth of the first channel 21 and the second channel 22 is designed to be 0.25mm-0.5mm, with the recess depth of the first channel 21 being greater than that of the second channel 22 to reduce the risk of localized electrolyte accumulation in the second channel 22.

[0062] For example, the first channel 21 has a depth of 0.5 mm and is uniformly distributed circumferentially along the cell casing, forming a spiral pattern. The main function of the main channel is to guide the flow of the new electrolyte, ensuring its uniform distribution throughout the cell. A second channel 22, with a depth of 0.25 mm, is designed between the first channels 21 and is staggered along the extension direction of the first channels 21. This promotes the mixing of the new and old electrolytes, further improving mixing efficiency by forming turbulence or eddies.

[0063] In some alternative embodiments, the first channel 21 and the second channel 22 are pipes disposed on the inner wall of the side plate 20.

[0064] In this embodiment, the first channel 21 and the second channel 22 are closed pipes. The first channel 21 is connected to the injection hole 40, and the end of the first channel 21 near the bottom plate 10 is open, so that the electrolyte flows into the receiving cavity inside the cell housing through the opening and wets the cell from the bottom to the top. Furthermore, the multiple openings of the first channels 21 are distributed at different positions on the bottom plate 10, which helps the newly added electrolyte to be distributed in different places, improves the mixing of the electrolyte, promotes the uniformity of the mixing of new and old electrolytes, improves the consistency of the electrolyte environment throughout the cell, and enhances the working performance of the cell.

[0065] In some other embodiments, some of the first channel 21 and the second channel 22 are formed by recessed structures provided on the inner wall of the side plate 20, and others are formed by pipes provided on the inner wall of the side plate 20; the recessed structures on the inner wall can mix the injected electrolyte with the electrolyte around the cell; the pipes on the inner wall can introduce the injected electrolyte to the bottom of the cell, thus helping to achieve a uniform distribution of electrolyte around the entire cell.

[0066] The specific connection between the first channel 21 and the injection hole 40 depends on the position of the injection hole 40. When the injection hole 40 is located on the top cover 30, there is a certain gap between the top cover 30 and the cell head. The electrolyte injected through the injection hole 40 can flow through the gap to the side plate 20. The first channel 21 is open at one end near the top cover 30, and the opening is lower than or flush with the cell head. The electrolyte flowing to the side plate 20 flows into the first channel 21 through the opening. When the injection hole 40 is located on the side plate 20, a pipe can be installed between the injection hole 40 and the adjacent first channel 21. The electrolyte is injected into the first channel 21 through the pipe, and then flows to other first channels 21 through the second channel 22 on the first channel 21. The cell housing is rotated by an external drive device to make the injected electrolyte evenly distributed in the cell housing and mixed evenly with the original electrolyte.

[0067] In some alternative embodiments, the first channel 21 has a width direction perpendicular to its extension direction, and the dimension of the first channel 21 in the width direction is 1mm-3mm.

[0068] The width of the first channel 21 is between 1 mm and 3 mm. The width of the first channel 21 within the above range helps to improve the fluidity of the electrolyte, form an effective mixing channel, and at the same time maintain a certain electrolyte flow rate to improve the mixing effect.

[0069] In some alternative embodiments, such as Figure 3 As shown, the outer wall of the side plate 20 is provided with reinforcing ribs 23, and the extending direction of the reinforcing ribs 23 intersects with the extending direction of the first channel 21.

[0070] On the exterior of the cell casing, multiple reinforcing ribs 23 are designed in a direction perpendicular to the extension direction of the first channel 21. These reinforcing ribs 23 improve the structural strength of the cell casing and reduce the risk of deformation or damage caused by rotation or external forces. Optionally, the reinforcing ribs 23 can also be configured as a staggered structure. Through the orthogonal arrangement of the support structure, the reinforcing ribs 23 can effectively improve the overall deformation resistance of the cell casing, while avoiding stress concentration problems caused by the overlapping directions of the inner and outer wall structures, thus ensuring the stability of the internal liquid channel network.

[0071] This utility model embodiment also provides a secondary battery, including any of the cell casings disclosed in the above embodiments.

[0072] This embodiment provides a maintainable secondary battery suitable for large-scale energy storage systems that promotes uniform electrolyte mixing. The cell casing of this module is also made of high-strength, corrosion-resistant materials, and the inner wall of the cell casing side plate 20 is designed with the same first channel 21 as in the previous embodiment, which slopes from top to bottom and has a depth of 1 mm. These first channels 21 are evenly distributed around the circumference of the cell casing, and second channels 22 connect adjacent first channels. When the electrolyte flows, turbulence or eddies are formed, which promotes the flow and mixing of the electrolyte.

[0073] When the energy storage battery pack reaches the end of its cycle and its performance significantly declines, maintenance personnel can use a dedicated lithium replenisher and electrolyte injection tool to precisely replenish the required new electrolyte containing lithium replenisher into the cell casing through the injection hole 40 on the top of the cell casing. Similar to the aforementioned embodiment, an external drive device slowly rotates the cell casing within a fixed angle range, causing the new electrolyte to flow along the first channel 21 and the second channel 22 on the side plate 20, resulting in vigorous stirring and exchange with the existing electrolyte, achieving uniform mixing of the old and new electrolytes.

[0074] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0075] Although alternative embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the alternative embodiments as well as all changes and modifications falling within the scope of the present invention.

[0076] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or terminal device that includes that element.

[0077] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the principle and implementation of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery cell housing, characterized in that, The cell housing has a cavity inside that accommodates the cell, and the cell housing is provided with a liquid injection hole (40). The inner wall of the battery cell housing is provided with a plurality of spaced first channels (21), at least one of the first channels (21) is connected to the liquid injection hole (40), and at least one of the first channels (21) is connected to the receiving cavity; The inner wall of the battery cell housing is also provided with at least one second channel (22), which is located between two adjacent first channels (21) and is connected to the two adjacent first channels (21) respectively.

2. The cell housing according to claim 1, characterized in that, The battery cell housing includes a bottom plate (10), a side plate (20), and a top cover (30), wherein the bottom plate (10), the side plate (20), and the top cover (30) enclose a cavity for accommodating the battery cell; The side plate (20) is arranged around the outer periphery of the top cover (30), and the first channel (21) extends around the inner periphery of the side plate (20). The first channel (21) includes a top channel (211) near the top cover (30) and a bottom channel (212) near the bottom plate (10). The top channel (211) and the bottom channel (212) are connected.

3. The cell housing according to claim 2, characterized in that, The side panel (20) includes a plurality of sub-side panels connected in sequence, each of the sub-side panels being arranged around the outer periphery of the top cover (30), the first channel (21) including an inclined channel (213) arranged on the plurality of sub-side panels, the inclined channels (213) on two adjacent sub-side panels being connected, wherein; The angle between the inclined channel (213) on each of the sub-side plates and the base plate (10) is 15°-45°.

4. The cell housing according to claim 3, characterized in that, Each of the sub-side panels includes a plurality of the inclined channels (213), and the plurality of inclined channels (213) are arranged in parallel; The inclined channel (213) near the base plate (10) is the bottom channel (212), and the side plate (20) is provided with a plurality of bottom channels (212) in the circumferential direction, and each sub-side plate is provided with the bottom channel (212).

5. The cell housing according to claim 4, characterized in that, A plurality of second channels (22) are provided between two adjacent first channels (21), and the plurality of second channels (22) are distributed at intervals along the extension direction of the first channel (21).

6. The cell housing according to claim 5, characterized in that, Between two adjacent first channels (21), the extension directions of a plurality of second channels (22) may be the same or different.

7. The cell housing according to claim 2, characterized in that, The first channel (21) and the second channel (22) include recessed structures disposed on the inner wall of the side plate (20).

8. The cell housing according to claim 2, characterized in that, The first channel (21) and the second channel (22) include pipes disposed on the inner wall of the side plate (20).

9. The cell housing according to claim 2, characterized in that, The outer wall of the side plate (20) is provided with reinforcing ribs (23), and the extending direction of the reinforcing ribs (23) intersects with the extending direction of the first channel (21).

10. A secondary battery, characterized in that, Includes the cell housing as described in any one of claims 1-9.

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