Battery, battery pack and electric device

Abstract

The invention relates to the technical field of power battery production, and provides a battery, a battery pack and a power utilization device. The battery provided by the invention comprises a shell with an accommodating cavity, and a cover plate assembly, the cover plate assembly is provided with a cover plate body connected with the shell and lower plastic connected to one side of the cover plate body, the lower plastic is provided with a first liquid injection channel, and the first liquid injection channel is communicated with a liquid injection hole in the cover plate body; the shell is provided with a second liquid injection channel, the second liquid injection channel is communicated with the first liquid injection channel and the containing cavity, and electrolyte directionally flows into the containing cavity from the liquid injection hole through the first liquid injection channel and the second liquid injection channel and can infiltrate the pole group contained in the containing cavity. According to the battery disclosed by the invention, the electrolyte can directionally flow into the accommodating cavity from the liquid injection hole through the first liquid injection channel and the second liquid injection channel, so that the pole group can be directionally infiltrated by the electrolyte, and the infiltration effect is favorably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, in particular to a battery. Meanwhile, the present application also relates to a battery pack provided with the battery and a power consumption device provided with the battery pack. BACKGROUND

[0002] The power battery mainly comprises a shell, a cover plate assembly, a positive pole, a negative pole and a pole group in structure. The pole group is installed inside the shell, and the cover plate assembly is used for covering the opening of the shell. The cover plate assembly comprises a cover plate body and a lower plastic, and the lower plastic mainly plays an insulating role.

[0003] In the production process of the lithium battery, electrolyte needs to be injected into the shell according to the required amount through the injection hole reserved in the cover plate assembly to soak the pole group. However, in the current injection method, the electrolyte is injected into the shell through the injection hole, which leads to poor soaking effect and needs to be further improved. SUMMARY

[0004] Therefore, the present application aims to provide a battery to realize directional soaking of the pole group by electrolyte and improve the soaking effect.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows: A battery comprises a shell with a containing cavity and a cover plate assembly. The cover plate assembly comprises a cover plate body connected with the shell and a lower plastic connected with one side of the cover plate body. The lower plastic is provided with a first injection channel, and the first injection channel is in communication with an injection hole on the cover plate body. The shell is provided with a second injection channel, and the second injection channel is in communication with the first injection channel and the containing cavity. Electrolyte flows into the containing cavity through the first injection channel and the second injection channel, and can soak the pole group contained in the containing cavity.

[0006] Further, the first injection channel comprises a first flow channel groove in communication with the injection hole and a second flow channel groove in communication with the first flow channel groove and the second injection channel. The first flow channel groove extends along the width direction of the lower plastic, the second flow channel groove extends along the length direction of the lower plastic, and the second flow channel groove is two grooves spaced apart along the width direction of the lower plastic.

[0007] Furthermore, a buffer groove is provided on the lower plastic surface at a position directly opposite the injection hole; the buffer groove is located on the extension path of the first flow channel groove, and the first flow channel groove is connected to the injection hole through the buffer groove; and / or, the buffer groove and the first flow channel groove are arranged at intervals, and a connecting flow channel groove is provided between the buffer groove and the first flow channel groove, and the first flow channel groove is connected to the injection hole through the connecting flow channel groove and the buffer groove.

[0008] Furthermore, the first flow channel has a plurality of first through holes on its wall for the electrolyte to pass through; and / or, the second flow channel has a plurality of second through holes on its wall for the electrolyte to pass through.

[0009] Furthermore, the lower plastic is provided with protrusions located at both ends along the length of the lower plastic; in the thickness direction of the lower plastic, the size L1 of the protrusions is greater than the size L2 of the first injection channel.

[0010] Furthermore, the second injection channel includes a flow groove disposed on the inner wall of the housing, and the flow groove communicates with the first injection channel.

[0011] Furthermore, the flow channels extend along the height direction of the shell and are arranged in multiple spaced intervals, each of which is connected to the first injection channel.

[0012] Furthermore, a portion of the sidewall of the housing arches outward from the accommodating cavity, forming a flow channel communicating with the accommodating cavity; corresponding to the flow channel, the cover plate body is provided with a protrusion, which seals the top of the flow channel.

[0013] Compared with related technologies, this application has the following advantages: (1) The battery described in this application has a first liquid injection channel provided on the lower plastic part of the cover plate assembly and a second liquid injection channel provided on the shell, so that the first liquid injection channel is connected to the liquid injection hole and the second liquid injection channel is connected to both the first liquid injection channel and the accommodating cavity in the shell. In this way, the electrolyte can flow from the liquid injection hole and through the first liquid injection channel and the second liquid injection channel into the accommodating cavity in a directional manner. This can achieve directional wetting of the electrode group in the accommodating cavity by the electrolyte and improve the wetting effect, thereby ensuring the electrical performance of the battery.

[0014] (2) The first liquid injection channel includes a first flow channel groove and a second flow channel groove, so that the first flow channel groove is connected to the liquid injection hole and extends along the width direction of the lower plastic, so that the second flow channel groove connects the first flow channel groove and the second liquid injection channel, and two second flow channel grooves are arranged at intervals along the width direction of the lower plastic. This structure is simpler than the arc or curved structure and is convenient for the preparation and molding of the first liquid injection channel.

[0015] (3) A buffer groove is set on the lower plastic surface, which is directly opposite the injection hole. This buffers the electrolyte during injection, preventing damage to the electrode assembly caused by the electrolyte impacting the electrode assembly. The buffer groove is arranged on the extension path of the first flow channel groove, so that the first flow channel groove is connected to the injection hole through the buffer groove. This allows the electrolyte to flow from the injection hole through the buffer groove and then into the first flow channel groove. This structure is relatively compact and easy to manufacture. The buffer groove and the first flow channel groove are arranged at intervals, and a connecting flow channel groove is provided between the buffer groove and the first flow channel groove. This allows the first flow channel groove to be connected to the injection hole through the connecting flow channel groove and the buffer groove. This allows the electrolyte to flow from the injection hole through the connecting flow channel groove and the buffer groove into the first flow channel groove.

[0016] (4) Multiple first through holes are provided on the wall of the first flow channel, which allows the electrolyte in the first flow channel to be directly injected into the accommodating cavity inside the shell through the multiple first through holes, thereby facilitating the uniform wetting of the electrode assembly by the electrolyte; Multiple second through holes are provided on the wall of the second flow channel, which allows the electrolyte in the second flow channel to be directly injected into the accommodating cavity inside the shell through the multiple second through holes, thereby also facilitating the uniform wetting of the electrode assembly by the electrolyte; At the same time, the combination of multiple first through holes and multiple second through holes can make the electrolyte wetting of the electrode assembly more uniform.

[0017] (5) A protrusion is provided, which can be used to limit the electrode assembly in the accommodating cavity. The size of the protrusion in the thickness direction of the lower plastic is larger than the size of the first liquid injection channel. This allows the electrode assembly and the first liquid injection channel to form a gap in the height direction of the shell, so that the electrolyte can flow smoothly into the accommodating cavity.

[0018] (6) The second liquid injection channel includes a flow groove provided on the inner wall of the shell, so that the flow groove is connected to the first liquid injection channel. This structure facilitates the directional wetting of the electrode assembly and makes it easier to prepare and form the flow groove and the shell.

[0019] (7) The flow channels extend along the height of the shell and are arranged in multiple intervals, so that each flow channel is connected to the first liquid injection channel. This facilitates the rapid and directional wetting of the electrode group by the electrolyte along multiple flow channels, reduces the wetting time, and improves the wetting effect of the electrode group.

[0020] (8) This causes part of the sidewall of the shell to arch outward of the cavity, and a flow channel is formed at this part of the sidewall that communicates with the cavity. The structure is simple and facilitates the integral fabrication of the shell and the flow channel.

[0021] This application also proposes a battery pack, wherein the battery pack contains the battery as described above.

[0022] The battery pack described in this application, by employing the aforementioned battery, allows the electrolyte to flow directionally into the receiving cavity from the injection hole and through the first injection channel and the second injection channel, thereby achieving directional wetting of the electrode assembly by the electrolyte, which is beneficial for improving the wetting effect, and thus improving the performance of the battery and the battery pack.

[0023] In addition, this application also proposes an electrical device in which a battery pack as described above is provided.

[0024] The electrical device described in this application, by employing the aforementioned battery pack, allows the electrolyte to flow directionally into the accommodating cavity from the injection hole and through the first injection channel and the second injection channel. This enables directional wetting of the electrode assembly by the electrolyte, which is beneficial for improving the wetting effect, enhancing the performance of the battery and battery pack, and thus improving the performance of the electrical device. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a perspective view of the battery cell described in the embodiments of this application; Figure 2 This is a front view of the battery cell described in an embodiment of this application; Figure 3 for Figure 2 Sectional view along the AA direction; Figure 4 for Figure 3 A close-up view of the middle cover plate assembly; Figure 5 This is a first-view structural schematic diagram of the cover plate assembly described in an embodiment of this application; Figure 6 This is a second-view structural schematic diagram of the cover plate assembly described in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of the shell described in the embodiment of this application; Explanation of reference numerals in the attached figures: 1. Housing; 2. Cover assembly; 101. Receptacle; 102. Flow channel; 21. Cover plate body; 22. Lower plastic; 201. Positive electrode post; 202. Negative electrode post; 203. Explosion-proof valve; 210. Injection hole; 211. Protrusion; 220. Raised part; 10. First flow channel groove; 20. Second flow channel groove; 30. Buffer groove; 1001. First through hole; 2001. Second through hole; 2002. Connecting port. Detailed Implementation

[0026] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0028] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0030] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0032] An embodiment of the first aspect of this application provides a battery cell that enables the electrolyte to directionally wet the electrode assembly, thereby improving the wetting effect.

[0033] In related technologies, power batteries typically consist of a casing, a cover assembly, positive terminals, negative terminals, and electrode arrays. The electrode arrays are installed inside the casing, and the cover assembly seals the openings in the casing. The cover assembly includes the cover body and a lower plastic layer, with the lower plastic layer primarily serving an insulating function.

[0034] In the production process of lithium batteries, electrolyte needs to be injected into the casing to wet the electrode assembly in the required amount through the injection holes reserved in the cover plate assembly. However, in the current injection method, the electrolyte is injected into the casing through the injection holes, resulting in poor wetting effect, which needs further improvement.

[0035] In view of this, in order to overcome the shortcomings of related technologies, the battery in this embodiment combines... Figures 1 to 7 In terms of overall design, it includes a housing 1 with a receiving cavity 101 and a cover plate assembly 2.

[0036] The cover assembly 2 includes a cover body 21 connected to the housing 1, and a lower plastic 22 connected to one side of the cover body 21. The lower plastic 22 has a first liquid injection channel, which communicates with the liquid injection hole 210 on the cover body 21. The housing 1 has a second liquid injection channel, which communicates with both the first liquid injection channel and the receiving cavity 101. Electrolyte flows directionally from the liquid injection hole 210 through the first and second liquid injection channels into the receiving cavity 101, thus wetting the electrode assembly housed within the receiving cavity 101.

[0037] Therefore, through the first liquid injection channel provided on the lower plastic part in the cover plate assembly 2 and the second liquid injection channel provided on the housing 1, the first liquid injection channel is connected to the liquid injection hole 210, and the second liquid injection channel is connected to both the first liquid injection channel and the receiving cavity 101 in the housing 1. In this way, the electrolyte can flow into the receiving cavity 101 from the liquid injection hole 210 and through the first and second liquid injection channels. This enables the electrolyte to directionally wet the electrode assembly in the receiving cavity 101 and improves the wetting effect.

[0038] Based on the above overview, specifically, let's continue to combine... Figures 1 to 7 As shown, the battery includes a housing 1 and a cover assembly 2. A receiving cavity 101 is formed inside the housing 1, and the electrode assembly is installed inside the receiving cavity 101. The cover assembly 2 includes a cover body 21 welded to the housing 1, and a lower plastic 22 connected to the side of the cover body 21 near the receiving cavity 101.

[0039] The battery also includes a positive terminal 201, a negative terminal 202, and an explosion-proof valve 203. The positive terminal 201 and negative terminal 202 are disposed in terminal holes on the cover plate body 21, and partially located in through holes on the lower plastic 22 corresponding to the terminal holes. Both the positive terminal 201 and negative terminal 202 are insulated from the cover plate body 21 through the lower plastic 22, and are electrically connected to the corresponding positive and negative tabs in the electrode assembly, respectively. The explosion-proof valve 203 is located between the positive terminal 201 and the negative terminal 202, and the cover plate body 21 also has an injection hole 210.

[0040] Combination Figures 3 to 6 As shown, in some exemplary embodiments, the first injection channel includes a first flow channel 10 communicating with the injection hole 210, and a second flow channel 20 communicating with both the first flow channel 10 and the second injection channel. The first flow channel 10 extends along the width direction of the lower plastic 22, and the second flow channel 20 extends along the length direction of the lower plastic 22, with two second flow channel 20s spaced apart along the width direction of the lower plastic 22. In a specific implementation, the electrolyte flows from the injection hole 210, through the first flow channel 10 and the second flow channel 20 to the second injection channel, and is then injected into the receiving cavity 101 to directionally wet the electrode assembly.

[0041] At this time, the first injection channel includes a first flow channel 10 and a second flow channel 20, so that the first flow channel 10 is connected to the injection hole 210 and extends along the width direction of the lower plastic 22, so that the second flow channel 20 connects the first flow channel 10 and the second injection channel, and two second flow channel 20s are arranged at intervals along the width direction of the lower plastic 22. This structure is simpler than the arc or curved structure and is convenient for the preparation and molding of the first injection channel.

[0042] Because the electrolyte injection hole 210 on the battery cover is directly below the electrode assembly, during the electrolyte injection process, the high-speed flowing electrolyte fluid is very likely to impact the electrode assembly directly below, causing problems such as wrinkles or damage to the electrode sheets, small electrolyte diffusion range leading to long wetting time and poor wetting effect, which in turn affect the cell performance and may even cause safety risks in severe cases.

[0043] Therefore, in this embodiment, we continue to combine Figures 3 to 6As shown, in some exemplary embodiments, a buffer groove 30 is provided on the lower plastic 22 directly opposite the injection hole 210. This buffer groove 30 buffers the electrolyte during injection, preventing damage to the electrode assembly caused by the electrolyte impacting the electrode assembly. Specifically, as one feasible implementation, the buffer groove 30 is located, for example, on the extension path of the first flow channel 10, which is connected to the injection hole 210 via the buffer groove 30. In this case, the electrolyte flows from the injection hole 210, is buffered by the buffer groove 30, and then flows into the first flow channel 10. This structure is relatively compact and easy to manufacture.

[0044] In practice, the buffer groove 30 and the first flow channel groove 10 are integrally formed on the lower plastic 22. The buffer groove 30 is approximately located in the middle of the first flow channel groove 10, and the size of the buffer groove 30 is larger than the size of the first flow channel groove 10 along the length of the lower plastic 22 to achieve a better buffering effect. Moreover, the projection shape of the buffer groove 30 on the lower plastic 22 can be rectangular, circular, or elliptical, etc.

[0045] As another feasible implementation, in this embodiment, for example, the buffer tank 30 and the first flow channel 10 are arranged at intervals, and a connecting flow channel is provided between the buffer tank 30 and the first flow channel 10. The first flow channel 10 is connected to the injection hole 210 through the connecting flow channel and the buffer tank 30. At this time, the electrolyte flows from the injection hole 210 into the first flow channel 10 through the connecting flow channel and the buffer tank 30.

[0046] In practice, one end of the connecting channel groove is connected to the buffer groove 30, and the other end of the connecting channel groove is connected to the first channel groove 10. The connecting channel groove can extend straight along the length of the lower plastic 22 or be arc-shaped, as long as it is ensured that the connecting channel groove is connected to both the buffer groove 30 and the first channel groove 10.

[0047] Based on the configuration of the first flow channel 10 and the second flow channel 20, refer to Figure 6 As shown, in some exemplary embodiments, the first flow channel 10 has a plurality of first through holes 1001 on its wall for the electrolyte to pass through. This allows the electrolyte in the first flow channel 10 to be directly injected into the receiving cavity 101 inside the housing 1 through the plurality of first through holes 1001, thereby facilitating the uniform wetting of the electrode assembly by the electrolyte.

[0048] Furthermore, the second flow channel 20 has multiple second through holes 2001 on its wall for the electrolyte to pass through. The multiple second through holes 2001 allow the electrolyte in the second flow channel 20 to be directly injected into the receiving cavity 101 inside the housing 1 through the multiple second through holes 2001, which also facilitates the uniform wetting of the electrode assembly by the electrolyte. Simultaneously, the cooperation of the multiple first through holes 1001 and the multiple second through holes 2001 enables the electrolyte to wet the electrode assembly even more uniformly.

[0049] It is worth noting that the plurality of first through holes 1001 and the plurality of second through holes 2001 are preferably arranged on the sidewall opposite to the electrode assembly, and the plurality of first through holes 1001 and the plurality of second through holes 2001 are preferably evenly distributed, which can further improve the uniformity of electrode assembly wetting.

[0050] Furthermore, it is worth noting that the number of the first through hole 1001 and the second through hole 2001 can be the same or different, and preferably more than two. It is also worth noting that the size of the first through hole 1001 and the second through hole 2001 is preferably the same to facilitate manufacturing, and the cross-sectional area of ​​the first through hole 1001 and the second through hole 2001 is not less than 1 mm². 2 It can be understood here that the cross-sectional areas of the first through hole 1001 and the second through hole 2001 can be set according to the actual situation, provided that the structural strength of the lower plastic 22 is guaranteed.

[0051] Furthermore, it is worth emphasizing that the buffer tank 30 is positioned directly opposite the injection hole 210. Considering its buffering effect on the electrolyte, no through holes are provided on the tank wall of the buffer tank 30. If the buffer tank 30 is large enough to avoid the position directly opposite the injection hole 210, and can provide a good buffering effect on the electrolyte, then through holes of appropriate size or number can be provided on the tank wall of the buffer tank 30.

[0052] Continue to refer to Figure 6 As shown, in some exemplary embodiments, the lower plastic 22 is provided with protrusions 220 located at both ends along the length of the lower plastic 22. In the thickness direction of the lower plastic 22, the size L1 of the protrusions 220 is, for example, larger than the size L2 of the first injection channel.

[0053] In the above structure, the protrusion 220 can be used to limit the electrode assembly within the accommodating cavity 101. Furthermore, the size L1 of the protrusion 220 in the thickness direction of the lower plastic 22 is larger than the size L2 of the first electrolyte injection channel. Thus, after the battery cell is assembled, the protrusion 220 presses against the diaphragm in the electrode assembly, creating a gap between the electrode assembly and the first electrolyte injection channel in the height direction of the housing 1. This facilitates the smooth flow of electrolyte into the accommodating cavity 101.

[0054] Continue to combine Figure 1 , Figure 3 , Figure 4 and Figure 7 As shown, in some exemplary embodiments, for example, the second injection channel includes a flow groove 102 disposed on the inner wall of the housing 1, the flow groove 102 communicating with the first injection channel. This structural form facilitates the directional wetting of the electrode assembly and facilitates the fabrication and molding of the flow groove 102 and the housing 1.

[0055] Specifically, continue to combine Figure 1 , Figure 3 , Figure 4 and Figure 7 As shown, in some exemplary embodiments, the flow channels 102 extend, for example, along the height direction of the housing 1, and are arranged in multiple spaced intervals, each flow channel 102 communicating with the first liquid injection channel. This facilitates the rapid and directional wetting of the electrode assembly by the electrolyte along the multiple flow channels 102, reducing the wetting time and improving the wetting effect of the electrode assembly.

[0056] In specific implementation, the flow channels 102 are preferably arranged on two opposite large surfaces of the shell 1, and multiple channels are arranged at intervals on each large surface. The portion of each of the multiple connecting channels on each large surface near the top is specifically connected to the second flow channel 20 on the same side. For example, a connecting port 2002 is provided on the second flow channel 20 at the position corresponding to each connecting channel, and the second flow channel 20 is connected to the multiple connecting channels through the corresponding connecting port 2002.

[0057] Reference Figure 7 As shown, in some exemplary embodiments, a portion of the sidewall of the housing 1 arches outward from the accommodating cavity 101, forming a flow channel 102 communicating with the accommodating cavity 101. This structural form facilitates the integral fabrication of the housing 1 and the flow channel 102. Furthermore, corresponding to the flow channel 102, the cover plate body 21 has a protrusion 211 that seals the top end of the flow channel 102. In specific implementations, the cover plate body 21 achieves a sealed connection between the cover plate body 21 and the housing 1 by sealing the top end of the flow channel 102 with the protrusion 211.

[0058] It should be noted that, besides the method of arching outward from the side wall of the housing 1 towards the accommodating cavity 101, the flow channel 102 can also adopt other structural forms. For example, multiple partitions can be provided on the inner wall of the housing 1, each partition having an L-shaped cross-section and comprising a first plate and a second plate, which are connected to form an L-shape. In a specific implementation, one end of each partition, for example, the first plate, is connected to the inner wall of the housing 1, and the second plate is used to abut against the large surface of the support electrode assembly. In this case, the gap between two adjacent partitions forms the flow channel 102, and such an arrangement is also feasible.

[0059] It is worth noting that, regarding the battery cell in this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still made by... Figures 1 to 7 As shown, it includes a housing 1 and a cover assembly 2. The housing 1 has an internal cavity 101 for accommodating the electrode assembly. The cover assembly 2 has a cover body 21 connected to the housing 1, and a lower plastic 22 connected to one side of the cover body 21. A first liquid injection channel is formed on the lower plastic 22, and the first liquid injection channel communicates with a liquid injection hole 210 on the cover body 21. A second liquid injection channel is formed on the housing 1, and the second liquid injection channel communicates with both the first liquid injection channel and the cavity 101. Electrolyte flows directionally from the liquid injection hole 210 through the first liquid injection channel and the second liquid injection channel into the cavity 101, and can wet the electrode assembly housed in the cavity 101.

[0060] The first flow channel 10 has multiple first through holes 1001 on its wall for the electrolyte to pass through, and the multiple first through holes 1001 are evenly spaced along the extension direction of the first flow channel 10. Similarly, the second flow channel 20 has multiple second through holes 2001 on its wall for the electrolyte to pass through, and the multiple second through holes 2001 are evenly spaced along the extension direction of the second flow channel 20.

[0061] The lower plastic 22 has a protrusion 220 located at both ends of the lower plastic 22 along its length, and the size of the protrusion 220 is larger than the size of the first injection channel in the thickness direction of the lower plastic 22.

[0062] The second injection channel includes a flow groove 102 disposed on the inner wall of the housing 1, which communicates with the first injection channel. Furthermore, the flow grooves 102 extend along the height direction of the housing 1 and are arranged in multiple spaced intervals. Preferably, multiple flow grooves 102 are arranged at intervals on two opposite large surfaces of the housing 1, and each flow groove 102 communicates with the second flow channel 20.

[0063] In this case, part of the sidewall of the housing 1 arches outward toward the outside of the accommodating cavity 101 and forms a flow groove 102 that communicates with the accommodating cavity 101. Corresponding to the flow groove 102, the cover plate body 21 is provided with a protrusion 211, which blocks the top of the flow groove 102.

[0064] In practice, the flow path of the electrolyte is as follows: Figure 4 and Figure 6As shown, the electrolyte flows in from the injection hole 210, passes through the buffer tank 30, the first flow channel 10, the second flow channel 20 and the connecting channel and is directionally injected into the bottom of the electrode assembly in the accommodating cavity 101. At the same time, part of the electrolyte flowing through the first flow channel 10 and the second flow channel 20 flows into the top of the electrode assembly through the first through hole 1001 and the second through hole 2001. In this way, the electrode assembly can be rapidly and directionally wetted, reducing the wetting time and improving the wetting effect of the electrode assembly.

[0065] In the above preferred embodiments, the specific settings and arrangements of the first injection channel, the second injection channel, the first flow channel 10, the second flow channel 20, the buffer groove 30, the first through hole 1001 and the second through hole 2001, and the flow groove 102, etc., can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the first injection channel, the second injection channel, the first flow channel 10, the second flow channel 20, the buffer groove 30, the first through hole 1001 and the second through hole 2001, and the flow groove 102, etc., can also be referred to the descriptions in the above exemplary embodiments.

[0066] The battery cell in this embodiment adopts the above design. By setting a first liquid injection channel and a second liquid injection channel, the first liquid injection channel is connected to the liquid injection hole 210, and the second liquid injection channel is connected to both the first liquid injection channel and the accommodating cavity 101 inside the housing 1. In this way, the electrolyte can flow from the liquid injection hole 210 and through the first and second liquid injection channels into the accommodating cavity 101 in a directional manner. This can achieve directional wetting of the electrode assembly inside the accommodating cavity 101 by the electrolyte and improve the wetting effect, thereby ensuring the electrical performance of the battery.

[0067] An embodiment of the second aspect of this application provides a battery pack in which the battery as described above is disposed.

[0068] In this embodiment, the battery pack, by employing the battery described above, allows the electrolyte to flow directionally into the receiving cavity 101 from the injection hole 210 and through the first injection channel and the second injection channel. This enables the electrolyte to directionally wet the electrode assembly, which is beneficial for improving the wetting effect and thus improving the performance of the battery and the battery pack.

[0069] An embodiment of the third aspect of this application provides an electrical device that includes a battery pack as described above.

[0070] In this embodiment, the electrical device, by employing the aforementioned battery pack, allows the electrolyte to flow directionally from the injection hole 210 through the first injection channel and the second injection channel into the receiving cavity 101. This enables directional wetting of the electrode assembly by the electrolyte, which improves the wetting effect, enhances the performance of the battery and battery pack, and ultimately improves the performance of the electrical device.

[0071] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1.A battery, characterized in that: a shell having a receiving cavity, and a cover plate assembly; the cover plate assembly has a cover plate body connected with the shell, and a lower plastic connected on one side of the cover plate body, and a first liquid injection channel is arranged on the lower plastic, and the first liquid injection channel is in communication with a liquid injection hole on the cover plate body; a second liquid injection channel is arranged on the shell, and the second liquid injection channel is in communication with the first liquid injection channel and the receiving cavity, electrolyte flows into the receiving cavity through the first liquid injection channel and the second liquid injection channel from the liquid injection hole, and the electrolyte can infiltrate the electrode group accommodated in the receiving cavity. 2.The battery according to claim 1, characterized in that: the first liquid injection channel comprises a first flow channel groove in communication with the liquid injection hole, and a second flow channel groove in communication with the first flow channel groove and the second liquid injection channel; the first flow channel groove extends along the width direction of the lower plastic, the second flow channel groove extends along the length direction of the lower plastic, and the second flow channel groove is two flow channel grooves spaced apart along the width direction of the lower plastic. 3.The battery according to claim 2, characterized in that: a buffer groove is arranged on the lower plastic opposite the liquid injection hole; the buffer groove is located on the extension path of the first flow channel groove, and the first flow channel groove is in communication with the liquid injection hole through the buffer groove; and / or, the buffer groove is spaced apart from the first flow channel groove, and a connecting flow channel groove is arranged between the buffer groove and the first flow channel groove, and the first flow channel groove is in communication with the liquid injection hole through the connecting flow channel groove and the buffer groove. 4.The battery according to claim 2, characterized in that: a plurality of first through holes are arranged on the groove wall of the first flow channel groove for the electrolyte to pass through; and / or, a plurality of second through holes are arranged on the groove wall of the second flow channel groove for the electrolyte to pass through. 5.The battery according to claim 1, characterized in that: a protruding part is arranged on the lower plastic, and the protruding part is located at both ends of the length direction of the lower plastic; in the thickness direction of the lower plastic, the size L1 of the protruding part is greater than the size L2 of the first liquid injection channel. 6.The battery according to any one of claims 1 to 5, characterized in that: the second liquid injection channel comprises a flow channel groove arranged on the inner wall of the shell, and the flow channel groove is in communication with the first liquid injection channel. 7.The battery according to claim 6, characterized in that: the flow channel groove extends along the height direction of the shell, and is a plurality of flow channel grooves spaced apart from each other, and each flow channel groove is in communication with the first liquid injection channel. 8.The battery according to claim 6, characterized in that: part of the side wall of the shell arches outwards to the outside of the receiving cavity, and forms the flow channel groove in communication with the receiving cavity; and a protruding part is arranged on the cover plate body corresponding to the flow channel groove, and the protruding part is sealed at the top end of the flow channel groove. 9.A battery pack, characterized in that: the battery pack comprises the battery according to any one of claims 1 to 8. 10.An electric device, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The battery pack of claim 9 is arranged in the power utilization device.

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