Battery cells, battery packs and electrical devices

Abstract

This application discloses a battery cell, a battery device, and an electrical device, relating to the field of battery technology. The battery cell includes a housing, an end cap, and an electrode assembly. The housing includes an end plate and a side plate, which surround a cavity. An opening is provided at one end of the side plate opposite to the end plate. The end cap covers the opening and has a first side and a second side. The electrode assembly is disposed within the cavity, and a gap is provided between the periphery of the electrode assembly and the end plate and the side plate. The first side of the end cap is the side away from the electrode assembly and has an injection port. The second side of the end cap has an outlet. A flow channel communicating between the injection port and the outlet is provided within the end cap, and the outlet communicates with the gap. The technical solution provided by this application aims to improve the overall structural stability and reliability of the battery cell.

Description

Technical Field

[0001] The embodiments in this application relate to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0002] In related technologies, battery cells can be encapsulated and protected by end caps and housings, and electrolyte injection holes can be provided on the end caps to allow electrolyte to be injected into the housing to wet the electrode components, thus ensuring the production and manufacturing of battery cells.

[0003] However, most of the injection holes on the end caps are oriented towards the electrode assembly, which means that the liquid flow injected through the injection holes can easily directly impact the electrode assembly, causing damage to the electrode assembly and affecting the overall structural stability of the battery cell. Utility Model Content

[0004] Several embodiments in this application propose a battery cell, a battery device, and an electrical device, aiming to improve the overall structural stability and reliability of the battery cell.

[0005] One embodiment of this application proposes a battery cell including a housing, an end cap, and an electrode assembly. The housing includes an end plate and a side plate, which surround a cavity. An opening is provided at one end of the side plate opposite to the end plate. The end cap covers the opening and has a first side and a second side. The electrode assembly is disposed within the cavity, and a gap is provided between the periphery of the electrode assembly and the end plate and the side plate. The first side of the end cap is the side away from the electrode assembly and has a liquid injection port. The second side of the end cap has a liquid outlet. A flow channel communicating between the liquid injection port and the liquid outlet is provided inside the end cap, and the liquid outlet communicates with the gap.

[0006] The technical solution of this application, by setting a flow channel inside the end cap and positioning the outlet of the flow channel at the gap and communicating with the gap, allows the electrolyte to flow into the gap from the outlet after being buffered by the flow channel. This allows the electrolyte to be injected into the bottom of the receiving cavity first, and then to wet the entire electrode assembly from bottom to top. This prevents the electrolyte injection of the battery cell from directly impacting the rolled side of the electrode assembly, effectively avoiding the electrode assembly from being impacted, delaminated, or damaged. At the same time, the buffering of the electrolyte by the flow channel also allows foreign matter carried by the electrolyte to adhere to the flow channel, which helps to avoid the possibility of foreign matter carried by the electrolyte adhering to the electrolyte assembly due to direct impact of the electrolyte on the rolled side of the electrode assembly. This results in better production quality of the battery cell, improving the performance of the battery cell and the production yield.

[0007] In one embodiment, the flow channel extends into the gap.

[0008] By adopting the above scheme, the flow channel extends into the gap, which can more stably guide the electrolyte into the gap for injection. This helps to further prevent electrolyte splashing from impacting the sides of the electrode assembly, and better improves the production quality of the battery cell.

[0009] In one embodiment, the flow channel includes a first channel and a second channel that are connected to each other. The first channel and the second channel are arranged at an angle, and the second channel extends into the gap. The first channel is connected to the injection port, and the second channel is connected to the outlet port.

[0010] By adopting the above scheme, the first and second channels, which are set at an angle, can better change the flow direction of the electrolyte in the guide channel, which makes it easier to reduce the liquid flow rate of the electrolyte injected into the accommodating cavity. The first channel, which extends along the end cap, can better achieve the buffering effect on the electrolyte, and the second channel extends to the gap for liquid injection, which further reduces the direct impact of the electrolyte on the electrode assembly and better improves the production quality of the battery cell.

[0011] In one embodiment, the end cap includes a cap body and a drainage structure. The cap body covers the opening and has the injection port. The cap body has the first channel inside. The drainage structure is connected to the cap body and extends into the gap. The drainage structure has the second channel inside and the drainage port.

[0012] By adopting the above scheme, the electrolyte is stably guided to the gap through the outlet on the channel for injection. This allows the end cap to better guide the electrolyte to the bottom of the cavity, so that the electrolyte can better wet the electrode assembly from the bottom of the cavity to the top, further reducing the impact of the electrolyte flow on the electrode assembly and ensuring the performance of the battery cell and the production yield.

[0013] In one embodiment, the flow guiding channel further includes a deflection channel, which connects the first channel and the second channel, and the inner wall of the deflection channel is arc-shaped or inclined to the first channel.

[0014] By adopting the above scheme, the liquid flow in the first channel can flow more smoothly to the second channel under the action of the baffle structure, reducing the obstruction of electrolyte flow in the guide channel, ensuring stable electrolyte injection of battery cells, and further improving the practicality and structural reliability of battery cells.

[0015] In one embodiment, the flow channel extends in a spiral shape.

[0016] By adopting the above scheme and utilizing the spiral-extended flow channel, the liquid flow path of the flow channel can be extended more effectively, which is conducive to further reducing the flow rate of the electrolyte, achieving a better buffering effect of the flow channel on the electrolyte, preventing the electrolyte from impacting the electrode assembly, ensuring the performance and production yield of the battery cell, and further improving the structural stability and reliability of the battery cell.

[0017] In one embodiment, at least two spaced gaps are formed in the accommodating cavity, and at least two liquid outlets are provided on the second side of the end cap, with each liquid outlet corresponding to one of the gaps.

[0018] By adopting the above solution, by setting at least two liquid outlets with corresponding gap numbers and positions on the end cap, the electrolyte can be guided more evenly into the accommodating cavity, thereby improving the wetting uniformity and wetting rate of the electrode assembly and further improving the production quality and efficiency of the battery cell.

[0019] In one embodiment, the flow channel includes at least two diversion channels, with one of the liquid outlets connected to one of the diversion channels.

[0020] By adopting the above scheme, at least two diversion channels are set in the end cap, and one diversion channel is connected to one liquid outlet. This allows the guide channel to evenly divert the electrolyte to at least two diversion channels, and the electrolyte to flow evenly into the accommodating cavity through at least two liquid outlets. This better improves the uniform wetting effect and wetting rate of the electrode assembly, and further improves the structural stability and reliability of the battery cell.

[0021] In one embodiment, the end cap further includes a filter element disposed within the flow channel.

[0022] By using the above solution, the filter element can intercept and block foreign objects such as dust and particles carried in the electrolyte as it flows in the guide channel, preventing foreign objects from entering the containment cavity with the electrolyte, reducing the interference of foreign objects on the electrode assembly, and further improving the production quality of the battery cell.

[0023] In one embodiment, the end cap includes an end cap body and a plastic part, the plastic part being connected to the end cap body, the plastic part being an integrally molded structure, the plastic part having the flow channel inside, and the plastic part having the liquid outlet on the side opposite to the end cap body.

[0024] By adopting the above solution, the end cap body is combined with the plastic part to form the end cap, which can more easily form the flow channel in the one-piece molded plastic part, reduce the production and processing difficulty of the end cap, and further improve the practicality and reliability of the battery cell.

[0025] In one embodiment, the end plate is rectangular in shape, and the side plate includes two opposing first plate segments and two opposing second plate segments. The two first plate segments are respectively connected to the two second plate segments and surround the receiving cavity with the end plate. The length of the first plate segment is greater than the length of the second plate segment. The connection between the first plate segment and the second plate segment is surrounded by the gap with the periphery of the end plate and the electrode assembly. And / or, the second plate segment is surrounded by the gap with the periphery of the end plate and the electrode assembly.

[0026] Using the above scheme, the battery cell can be set as a square battery, and the gap can be formed between the corner of the casing and the periphery of the electrode assembly. When there are at least two electrode assemblies in the battery cell, the gap can be formed between the edge of the multiple electrode assemblies and the second side plate and the end plate. This is conducive to making full use of the internal gap of the battery cell for liquid injection, and further improving the practicality and reliability of the battery cell.

[0027] This application also proposes a battery device comprising a battery cell as described in any of the embodiments.

[0028] This application also proposes an electrical device, including a battery device as described in any of the foregoing embodiments.

[0029] By using the battery device described in the preceding embodiments of this application in an electrical device, the battery capacity of the electrical device can be increased, which is beneficial to improving the battery life and voltage.

[0030] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments or prior art of this application, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of a vehicle according to some embodiments of this application;

[0033] Figure 2 This is an exploded view of the structure of a battery cell according to some embodiments of this application;

[0034] Figure 3 This is a longitudinal cross-sectional view of a battery cell according to some embodiments of this application;

[0035] Figure 4 This is a longitudinal cross-sectional view of a battery cell according to other embodiments of this application;

[0036] Figure 5 This is a cross-sectional view of a battery cell according to some embodiments of this application;

[0037] Figure 6 This is an exploded view of the end cap structure of a battery cell according to some embodiments of this application;

[0038] Figure 7 This is a schematic diagram of the structure of the plastic part of the battery cell in some embodiments of this application;

[0039] Figure 8 This is a cross-sectional view of the plastic part of a battery cell according to some embodiments of this application;

[0040] Figure 9 This is a longitudinal cross-sectional view of the plastic part of a battery cell according to some embodiments of this application;

[0041] Figure 10 This is a longitudinal cross-sectional view of the end cap of a battery cell according to some embodiments of this application;

[0042] Figure 11 This is a longitudinal cross-sectional view of the end cap of a battery cell according to other embodiments of this application.

[0043] Explanation of icon numbers:

[0044] 1000. Vehicle; 100. Battery assembly; 10. Battery cell; 11. Housing; 11a. Receptacle; 11b. Gap; 111. End plate; 113. Side plate; 1131. First plate segment; 1133. Second plate segment; 13. End cap; 13a. Flow guide channel; 13b. First channel; 13c. Second channel; 13d. Baffle channel; 13e. Diverting channel; 131. End cap body; 133. Plastic part; 1331. Drainage structure; 135. Injection port; 137. Outlet port; 15. Electrode assembly; 200. Controller; 300. Motor. Detailed Implementation

[0045] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of several embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0046] It should be noted that if directional indications (such as up, down, left, right, front, back, etc.) are involved in multiple embodiments of this application, the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0047] Furthermore, if multiple embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0048] In related technologies, battery cells can utilize end caps and housings to encapsulate and protect electrode assemblies housed within the housing. Injection holes can be provided on the end caps to allow electrolyte to be injected into the housing and wet the electrode assemblies, ensuring the smooth operation of the battery cell. However, the injection holes on the end caps are mostly oriented towards the electrode assemblies, causing the injected electrolyte to directly impact the electrode assemblies, potentially damaging them and affecting the overall structural stability of the battery cell.

[0049] It should be noted that the electrode assembly can be formed by winding a positive electrode, a separator, and a negative electrode. The electrode assembly can be inserted into the housing through an opening, and then an end cap can be installed on the housing to close the opening, thus sealing and protecting the electrode assembly. The electrolyte injection holes on the end caps are mostly opposite the sides of the wound electrode assembly. Because the injected electrolyte has a certain flow rate, it can easily impact the wound electrode assembly, causing misalignment or damage. Furthermore, direct impact from the electrolyte flow can easily attract dust, particles, and other foreign matter to the electrode assembly, affecting the performance and lifespan of the individual battery cells.

[0050] Based on the above considerations, in order to solve the problem that the electrode assembly of a battery cell is easily damaged by impact, the battery cell proposed in this application includes a housing, an end cap, and an electrode assembly. The housing includes an end plate and a side plate, and the end plate and side plate surround a cavity. An opening is provided at one end of the side plate opposite to the end plate. The end cap closes the opening and has a first side and a second side. The electrode assembly is disposed in the cavity, and a gap is provided between the periphery of the electrode assembly and the end plate and side plate. The first side of the end cap is the side away from the electrode assembly and has a liquid injection port. The second side of the end cap has a liquid outlet. A flow channel connecting the liquid injection port and the liquid outlet is provided inside the end cap, and the liquid outlet is connected to the gap.

[0051] In the embodiments of this application, by providing a flow channel inside the end cap, and positioning the outlet of the flow channel at the gap and communicating with the gap, the electrolyte can be buffered by the flow channel and then flow into the gap from the outlet. This allows the electrolyte to be injected into the bottom of the receiving cavity first, and then to wet the entire electrode assembly from bottom to top. This prevents the electrolyte injection of the battery cell from directly impacting the rolled side of the electrode assembly, effectively avoiding the electrode assembly from being impacted, delaminated, or damaged. At the same time, the buffering of the electrolyte by the flow channel also allows foreign matter carried by the electrolyte to adhere to the flow channel. This helps to avoid the electrolyte directly impacting the rolled side of the electrode assembly, which could lead to a certain probability of foreign matter carried by the electrolyte adhering to the electrolyte assembly. As a result, the battery cell can achieve better production quality, improve battery cell performance, and increase production yield.

[0052] The battery device in this application can serve as a power source or power system for an electrical device. The battery device refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. This is beneficial for improving the overall performance of the battery device and facilitating its promotion.

[0053] The aforementioned electrical devices may include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, rail trains, ships, spacecraft, etc. Among them, electric toys may include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0054] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0055] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is internally provided in the vehicle 1000, and the battery device 100 can be located at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0056] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0057] In the battery device 100, there can be multiple battery cells 10, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 10 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 10 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 10.

[0058] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 10 can be cylindrical, flat, cuboid, or other shapes.

[0059] Please see Figures 2 to 4The battery cell 10 proposed in this application includes a housing 11, an end cap 13, and an electrode assembly 15. The housing 11 includes an end plate 111 and a side plate 113. The end plate 111 and the side plate 113 surround a receiving cavity 11a. An opening is provided on one end of the side plate 113 opposite to the end plate 111. The end cap 13 closes the opening and has a first side and a second side opposite to each other. The electrode assembly 15 is disposed in the receiving cavity 11a. A gap 11b is provided between the periphery of the electrode assembly 15 and the end plate 111 and the side plate 113. The first side of the end cap 13 is the side away from the electrode assembly and has a liquid injection port 135. The second side of the end cap 13 has a liquid outlet 137. A guide channel 13a is provided inside the end cap 13 to connect the liquid injection port 135 and the liquid outlet 137. The liquid outlet 137 is disposed at the gap 11b and is connected to the gap 11b.

[0060] The housing 11 and the end cap 13 can be combined to form the structural shell of the battery cell 10. The end plate 111 and side plate 113 of the housing 11 and the end cap 13 can form a relatively closed space to accommodate the protective electrode assembly 15, ensuring the stable charging and discharging of the battery cell 10. The housing 11 can be formed by integral stamping or casting to create a box structure with side plates 113 surrounding the end plate 111; or the housing 11 can be formed by welding the end plate 111 and the side plate 113. The end plate 111 and the side plate 113 can be used to form an accommodating cavity 11a, and the end of the side plate 113 away from the end plate 111 can form an opening for assembly. The end cover 13 can be larger than the size of the opening. A positive electrode post and a negative electrode post that are connected to the electrode tabs of the electrode assembly 15 can be provided on the end cover 13. Fastening connection structures such as buckles and bolts can be provided between the end cover 13 and the side plate 113. At the same time, sealing structures such as sealing gaskets and sealing rings can be provided between the end cover 13 and the side plate 113 to ensure a tight fit between the housing 11 and the end cover 13. The electrode assembly 15 may include a positive electrode structure, a negative electrode structure, and a diaphragm. The diaphragm is disposed between the positive electrode structure and the negative electrode structure. The electrode assembly 15 may be formed by assembling the positive electrode structure, the diaphragm, and the negative electrode structure through winding, stacking, or other means, and the positive electrode structure and the negative electrode structure may form positive and negative tabs, respectively, for connection to electricity.

[0061] During the assembly of the battery cell 10, the electrode assembly 15 can be inserted into the receiving cavity 11a through the opening. The receiving cavity 11a is then sealed by the end cap 13, and the positive and negative tabs of the electrode assembly 15 are electrically connected to the positive and negative terminals of the end cap 13, respectively. The end cap 13 and the housing 11 provide stable protection for the electrode assembly 15, ensuring the stable operation of the battery cell 10.

[0062] The end cap 13 closes the opening, allowing the second side of the end cap 13 to face the receiving cavity 11a. By providing a flow channel 13a inside the end cap 13, and providing an injection port 135 on the first side of the end cap 13 and an outlet port 137 on the second side of the end cap 13, electrolyte can be injected from the injection port 135. The electrolyte then flows through the flow channel 13a and then flows into the receiving cavity 11a from the outlet port 137, ensuring that the electrolyte stably wets the electrode assembly 15 in the receiving cavity 11a and guaranteeing the stable production and manufacturing of the battery cell 10.

[0063] To ensure that the electrode assembly 15 can be stably installed in the receiving cavity 11a, the volume of the receiving cavity 11a is usually larger than the volume of the electrode assembly 15. After the electrode assembly 15 is installed in the receiving cavity 11a, a gap 11b can be formed between the periphery of the electrode assembly 15 and the side plate 113 and the end plate 111. The liquid outlet 137 of the end cap 13 is correspondingly set at the gap 11b. The liquid outlet 137 can be set at the position where the surface of the end cap 13 is directly opposite the gap 11b; or the end cap 13 can be provided with an extension structure extending into the receiving cavity 11a, with the extension structure set at the gap 11b, and the liquid outlet 137 is set on the extension structure so that the liquid outlet 137 communicates with the gap 11b. This allows the electrolyte to be stably guided to the gap 11b for injection, effectively avoiding the impact of the electrolyte on the rolled side of the electrode assembly 15 when it enters, and preventing the electrode assembly 15 from being delaminated or damaged by impact. Meanwhile, the flow channel 13a can slow down the flow of the electrolyte, better reduce the impact of the electrolyte on the electrode assembly 15, so that the electrolyte can flow smoothly into the accommodating cavity 11a to wet the electrode assembly 15 and improve the production quality of the battery cell 10.

[0064] The technical solution of this application provides a flow channel 13a inside the end cap 13, with the outlet 137 connected to the flow channel 13a located at and communicating with the gap 11b. This allows the electrolyte to be buffered by the flow channel 13a and then flow into the gap 11b from the outlet 137. The electrolyte is first injected into the bottom of the receiving cavity 11a and then wets the entire electrode assembly 15 from bottom to top, preventing the electrolyte injection of the battery cell 10 from directly impacting the rolled side of the electrode assembly 15, effectively avoiding the electrode assembly 15 from being impacted and delaminated or damaged. At the same time, the buffering of the electrolyte by the flow channel 13a also allows foreign matter carried by the electrolyte to adhere to the flow channel 13a, which helps to avoid the electrolyte directly impacting the rolled side of the electrode assembly 15 and thus has a certain probability of causing foreign matter carried by the electrolyte to adhere to the electrolyte assembly. This allows the battery cell 10 to achieve better production quality, improve the performance of the battery cell 10, and increase the production yield.

[0065] See Figure 3 and Figure 4In one embodiment of this application, the flow channel 13a extends into the gap 11b.

[0066] In this embodiment, the end cap 13 may have an extension structure extending into the gap 11b. The end cap 13 may be provided with a flow channel 13a that penetrates the extension structure, so that when the battery cell 10 is injected with electrolyte, the electrolyte can be directly guided into the gap 11b through the flow channel 13a, effectively avoiding the impact of the electrolyte on the rolled side of the electrode assembly 15 during electrolyte injection. Alternatively, a portion of the flow channel 13a may be horizontally disposed inside the main body of the end cap 13, with a portion disposed within the extension structure. This allows the flow channel 13a to play a role in changing the direction of the liquid flow, achieving a better buffering effect on the electrolyte and better preventing the electrode assembly 15 from being impacted by the electrolyte.

[0067] By adopting the above scheme, the electrolyte can be more stably guided into the gap 11b by extending the flow channel 13a into the gap 11b. This helps to further prevent electrolyte splashing from impacting the rolled side of the electrode assembly 15 and improves the production quality of the battery cell 10.

[0068] See Figure 4 and Figure 9 In one embodiment of this application, the flow channel 13a includes a first channel 13b and a second channel 13c that are connected to each other. The first channel 13b and the second channel 13c are arranged at an angle. The second channel 13c extends into the gap 11b. The first channel 13b is connected to the injection port 135 and the second channel 13c is connected to the outlet port 137.

[0069] In this embodiment, the first channel 13b can be a channel extending along the end cap 13. The first channel 13b can guide and buffer the electrolyte injected from the injection ports 135 at various locations, facilitating the arrangement of components on the end cap 13. The length and width of the first channel 13b can be set according to the buffering effect on the electrolyte. The second channel 13c can be a channel perpendicular to or inclined to the extension direction of the end cap 13. The second channel 13c can be used as a branch pipe of the first channel 13b, or a bent or angled structure can be used to connect one end of the first channel 13b and one end of the second channel 13c, allowing the first channel 13b and the second channel 13c to communicate. Furthermore, the first channel 13b and the second channel 13c can be set at an angle. Extending the second channel 13c into the gap 11b can better change the flow direction of the electrolyte, allowing it to be more smoothly guided to the gap 11b for injection, achieving a better buffering and guiding effect on the electrolyte.

[0070] By adopting the above scheme, the first channel 13b and the second channel 13c, which are set at an angle, can better change the flow direction of the electrolyte in the guide channel 13a, which makes it easier to reduce the liquid flow velocity of the electrolyte injected into the accommodating cavity 11a. The first channel 13b, which extends along the end cap 13, can better achieve the buffering effect on the electrolyte, and the second channel 13c extends to the gap 11b for liquid injection, which further reduces the direct impact of the electrolyte on the electrode assembly 15 and better improves the production quality of the battery cell 10.

[0071] See Figure 4 and Figure 11 In one embodiment of this application, the end cap 13 includes a cap body and a drainage structure 1331. The cap body covers the opening and has an injection port 135. The cap body has a first channel 13b. The drainage structure 1331 is connected to the cap body and extends into the gap 11b. The drainage structure 1331 has a second channel 13c and an outlet 137.

[0072] In this embodiment, the drainage structure 1331 can be an extended protruding pipe structure or a long block on the second side of the end cap 13. The drainage structure 1331 can be hollow inside to form a second channel 13c. The drainage structure 1331 can be positioned opposite the cover and the gap 11b, allowing the drainage structure 1331 to be inserted into the gap 11b when the cover is closed during the assembly of the battery cell 10. The outlet 137 on the drainage structure 1331 can better guide the electrolyte to the gap 11b for injection, preventing the electrolyte from directly impacting the rolled side of the electrode assembly 15. The outlet 137 can be located on the end face of the drainage structure 1331 opposite the cover, or on the side wall of the drainage structure 1331 opposite the inner wall of the accommodating cavity 11a, further preventing the electrolyte from impacting the electrode assembly 15.

[0073] By adopting the above scheme, the flow-guiding structure 1331 is inserted into the gap 11b, and the electrolyte is stably guided to the gap 11b for injection through the liquid outlet 137 on the flow-guiding channel. This allows the end cap 13 to better guide the electrolyte to the bottom of the receiving cavity 11a, so that the electrolyte can better wet the electrode assembly 15 from the bottom of the receiving cavity 11a from top to bottom, further reducing the impact of the electrolyte flow on the electrode assembly 15, and ensuring the performance and production yield of the battery cell 10.

[0074] See Figure 10 and Figure 11 In one embodiment of this application, the flow guiding channel 13a further includes a deflection channel 13d, which connects the first channel 13b and the second channel 13c. The inner wall of the deflection channel 13d is arc-shaped or inclined to the first channel 13b.

[0075] In this embodiment, the baffle channel 13d can be a curved structure or an angled structure, which can stably connect the first channel 13b and the second channel 13c, which are set at an angle, to form an integral guiding channel 13a, ensuring stable electrolyte flow and injection. The inner wall of the baffle structure can be arc-shaped so that the liquid flow can flow more smoothly into the second channel 13c when passing through the baffle structure; or, the inner wall of the baffle structure can be inclined to the first channel 13b, which can be used to create a liquid flow difference between the first channel 13b and the second channel 13c, ensuring that the electrolyte can flow smoothly into the second channel 13c, thereby achieving stable electrolyte injection of the battery cell 10.

[0076] By adopting the above scheme, under the action of the baffle structure, the liquid flow in the first channel 13b can flow more smoothly to the second channel 13c, reducing the obstruction of electrolyte flow in the guide channel 13a, ensuring stable electrolyte injection of the battery cell 10, and further improving the practicality and structural reliability of the battery cell 10.

[0077] In one embodiment of this application, the flow channel 13a is arranged in a spiral shape.

[0078] By adopting the above scheme, the liquid flow path of the spiral-extended flow channel 13a can be extended better, which is conducive to further reducing the flow rate of the electrolyte, realizing a better buffering effect of the flow channel 13a on the electrolyte, preventing the electrolyte from impacting the electrode assembly 15, ensuring the performance and production yield of the battery cell 10, and further improving the structural stability and reliability of the battery cell 10.

[0079] See Figure 5 and Figure 7 In one embodiment of this application, at least two spaced gaps 11b are formed in the accommodating cavity 11a, and at least two liquid outlets 137 are provided on the second side of the end cap 13, with each liquid outlet 137 corresponding to a gap 11b.

[0080] It is understandable that when the receiving cavity 11a is square and the electrode assembly 15 is cylindrical or square, the electrode assembly 15 can be installed in the receiving cavity 11a, creating gaps 11b at the four corners of the receiving cavity 11a to avoid interference with the electrode assembly 15; or when the battery cell 10 includes multiple electrode assemblies 15, the multiple electrode assemblies 15 can be installed side by side in the receiving cavity 11a, creating gaps 11b between each electrode assembly 15 and the inner wall of the receiving cavity 11a, as well as between adjacent electrode assemblies 15. Therefore, at least two gaps 11b can be formed in the receiving cavity 11a, allowing the electrode assembly 15 to be spaced appropriately within the receiving cavity 11a.

[0081] The end cap 13 can be provided with corresponding liquid outlets 137 on the second side according to the number and position of gaps 11b. That is, the end cap 13 can be provided with at least two liquid outlets 137 on the second side, with one liquid outlet 137 facing one gap 11b. During the production process of the battery cell 10, the flow channel 13a can distribute and guide the electrolyte injected into the injection port 135 to the at least two liquid outlets 137 for discharge, so that the electrolyte can be injected into the receiving cavity 11a more evenly, achieving a more uniform wetting effect of the electrode assembly 15 and better improving the production quality of the battery cell 10. At the same time, using at least two liquid outlets 137 to simultaneously inject the electrolyte into the receiving cavity 11a is also conducive to better improving the liquid injection rate of the battery cell 10 and further improving the production efficiency of the battery cell 10.

[0082] By adopting the above solution, by setting at least two liquid outlets 137 with corresponding gaps 11b in number and position on the end cap 13, the electrolyte can be guided more evenly into the accommodating cavity 11a, thereby improving the wetting uniformity and wetting rate of the electrode assembly 15 and further improving the production quality and production efficiency of the battery cell 10.

[0083] See Figure 7 and Figure 8 In one embodiment of this application, the flow channel 13a includes at least two flow diversion channels 13e, and a liquid outlet 137 is connected to one flow diversion channel 13e.

[0084] In this embodiment, the end cap 13 can be provided with at least two diversion channels 13e according to the required component arrangement. For example, the diversion channels 13e can bypass the positive or negative terminal, so that at least two diversion channels 13e can be stably extended within the end cap 13 and one diversion channel 13e can be stably connected to one diversion port, ensuring stable diversion of the electrolyte injected into the guide channel 13a. This allows the guide channel 13a to evenly divert the electrolyte to at least two outlets 137 for discharge, so that the electrolyte is more evenly distributed in the accommodating cavity 11a to wet the electrode assembly 15.

[0085] By adopting the above scheme, at least two diversion channels 13e are provided in the end cap 13, and one diversion channel 13e is connected to one liquid outlet 137, so that the guide channel 13a can evenly divert the electrolyte to at least two diversion channels 13e, and the electrolyte can be evenly distributed into the receiving cavity 11a through at least two liquid outlets 137, thereby improving the uniform wetting effect and wetting rate of the electrode assembly 15, and further improving the structural stability and reliability of the battery cell 10.

[0086] See Figure 2 , Figure 3 and Figure 5In one embodiment of this application, the end plate 111 is rectangular in shape, and the side plate 113 includes two opposing first plate segments 1131 and two opposing second plate segments 1133. The two first plate segments 1131 are respectively connected to the two second plate segments 1133, and together with the end plate 111, they form an accommodating cavity 11a. The length of the first plate segment 1131 is greater than the length of the second plate segment 1133. The connection between the first plate segment 1131 and the second plate segment 1133 is surrounded by a gap 11b with the periphery of the end plate 111 and the electrode assembly 15; and / or, the second plate segment 1133 is surrounded by a gap 11b with the periphery of the end plate 111 and the electrode assembly 15.

[0087] Using the above scheme, the battery cell 10 can be a prismatic battery. The corner where the first plate segment 1131 and the second plate segment 1133 of the housing 11 are connected can form a gap with the periphery of the electrode assembly 15. When there are at least two electrode assemblies 15 in the battery cell 10, the edges of the multiple electrode assemblies 15 arranged can form a gap 11b with the second side plate 1133 and the end plate 111. This is beneficial to make full use of the internal space of the battery cell 10 and further improve the practicality and reliability of the battery cell 10.

[0088] In one embodiment of this application, the end cap 13 further includes a filter element disposed within the flow channel 13a.

[0089] In this embodiment, the filter element can be a filter material such as filter cotton or a filter screen. The filter element can be filled in the flow channel 13a, or it can be formed by molding a mesh structure in the flow channel 13a during the manufacturing of the end cap 13. Using the filter element, when the electrolyte flows within the flow channel 13a, the filter element intercepts and blocks foreign objects such as dust and particles carried in the electrolyte, preventing foreign objects from entering the receiving cavity 11a with the electrolyte, reducing the interference of foreign objects on the electrode assembly 15, and further improving the production quality of the battery cell 10.

[0090] See Figure 6 In one embodiment of this application, the end cap 13 includes an end cap body 131 and a plastic part 133. The plastic part 133 is connected to the end cap body 131 and is an integrally molded structure. The plastic part 133 is provided with a flow channel 13a and a liquid outlet 137 on the side of the plastic part 133 facing away from the end cap body 131.

[0091] In this embodiment, the end cap body 131 can be the main structure that connects the end cap 13 with the housing 11. Fastening connection structures such as buckles and bolts can be provided between the end cap body 131 and the housing 11, and sealing materials such as gaskets and sealant can be provided between the end cap body 131 and the housing 11 to ensure the sealed and tight connection between the end cap body 131 and the housing 11, and to ensure the overall structural stability and reliability of the battery cell 10.

[0092] By connecting the plastic part 133 to the end cap body 131, the end cap body 131 can be connected to the housing 11, and the plastic part 133 can be positioned at the opening. The periphery of the plastic part 133 abuts against the inner wall of the accommodating cavity 11a, providing some support. The insulating properties of the plastic part 133 also provide insulation for the end cap body 131, ensuring the structural stability of the battery cell 10. The plastic part 133 can be manufactured using 3D printing technology or other integral molding methods, allowing for better formation of the flow channel 13a within the plastic part 133. The integral molding of the plastic part 133 better ensures the sealing of the flow channel 13a, reducing electrolyte leakage and further improving the structural stability and reliability of the battery cell 10. The injection port 135 can be located on the surface of the plastic part 133 facing the end cap body 131, and the end cap body 131 can have a corresponding through hole connecting to the injection port 135 for electrolyte injection.

[0093] By adopting the above solution, the end cap 13 is formed by combining the end cap body 131 with the plastic part 133. The flow channel 13a can be formed more conveniently in the integrally molded plastic part 133, reducing the production and processing difficulty of the end cap 13 and further improving the practicality and reliability of the battery cell 10.

[0094] In some embodiments, the production process of the battery cell 10 can utilize an electrolyte injection monitoring system to monitor the electrolyte injection rate, enabling the electrolyte to be injected more smoothly into the receiving cavity 11a. This electrolyte injection monitoring system may include a flow meter, an injection device, and a control device. The flow meter's measuring probe can be positioned within the height of the flow channel 13a, allowing the injection device to communicate with the injection port 135. During injection, the measuring probe can detect the liquid flow velocity within the flow channel 13a, transmitting the monitored flow velocity data to the control device. The control device then compares and analyzes the measured data with set data to derive a corresponding adjustment feedback signal. This signal enables the injection device to adjust the injection flow velocity accordingly, further ensuring a smoother injection of the electrolyte into the receiving cavity 11a, better preventing the electrode assembly 15 from being impacted by the electrolyte, and improving the production quality of the battery cell 10.

[0095] This application also proposes a battery device 100, including a battery cell 10 as described in any of the foregoing embodiments, the specific structure of which refers to the above embodiments.

[0096] This application also proposes an electrical device including a battery device 100 as described in any of the foregoing embodiments, the specific structure of which refers to the above embodiments. By employing the battery device 100 from the foregoing embodiments of this application in the electrical device, the battery capacity of the electrical device can be increased, which is beneficial for improving battery life and voltage.

[0097] Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, rail trains, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0098] Since the electrical device proposed in this application adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0099] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery cell, characterized in that, include: A housing, the housing including an end plate and a side plate, the end plate and the side plate surrounding an accommodating cavity, and an opening on one end of the side plate opposite to the end plate; End cap, the end cap covering the opening, the end cap having opposing first and second sides; and An electrode assembly is disposed within the accommodating cavity, and a gap is provided between the periphery of the electrode assembly and the end plate and the side plate; The first side of the end cap is the side away from the electrode assembly, and the first side is provided with a liquid injection port. The second side of the end cap is provided with a liquid outlet. The end cap is provided with a flow channel connecting the liquid injection port and the liquid outlet. The liquid outlet is connected to the gap.

2. The battery cell as described in claim 1, characterized in that, The flow channel extends into the gap.

3. The battery cell as described in claim 2, characterized in that, The flow channel includes a first channel and a second channel that are connected to each other. The first channel and the second channel are set at an angle. The second channel extends into the gap. The first channel is connected to the injection port and the second channel is connected to the outlet port.

4. The battery cell as described in claim 3, characterized in that, The end cap includes: A cap, which covers the opening, has the liquid inlet, and has the first channel inside; and A drainage structure is provided, which is connected to the cover and extends into the gap. The drainage structure has a second channel and a liquid outlet.

5. The battery cell as described in claim 3, characterized in that, The flow guiding channel also includes a deflection channel, which connects the first channel and the second channel. The inner wall of the deflection channel is arc-shaped or inclined to the first channel.

6. The battery cell as described in claim 1, characterized in that, The flow channel is arranged in a spiral shape.

7. The battery cell as described in claim 1, characterized in that, The accommodating cavity has at least two spaced gaps, and the second side of the end cap has at least two liquid outlets, with each liquid outlet corresponding to one of the gaps.

8. The battery cell as described in claim 7, characterized in that, The flow channel includes at least two diversion channels, and one of the liquid outlets is connected to one of the diversion channels.

9. The battery cell as described in claim 1, characterized in that, The end cap also includes a filter element disposed within the flow channel.

10. The battery cell as described in claim 1, characterized in that, The end cap includes an end cap body and a plastic part. The plastic part is connected to the end cap body and is an integrally molded structure. The plastic part has the flow channel inside and the liquid outlet is provided on the side of the plastic part opposite to the end cap body.

11. The battery cell as described in claim 1, characterized in that, The end plate is rectangular in shape, and the side plate includes two opposing first plate segments and two opposing second plate segments. The two first plate segments are respectively connected to the two second plate segments and surround the receiving cavity with the end plate. The length of the first plate segment is greater than the length of the second plate segment. The gap is provided between the connection between the first plate segment and the second plate segment and the periphery of the end plate and the electrode assembly; and / or, the gap is provided between the second plate segment and the periphery of the end plate and the electrode assembly.

12. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 11.

13. An electrical appliance, characterized in that, Includes the battery device as described in claim 12.

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