Battery, battery pack, and electric device

Abstract

The application relates to the technical field of power battery production, and provides a battery, a battery pack and a power utilization device. The battery comprises a shell with a containing 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; a first liquid injection channel is arranged on the lower plastic and is in communication with a liquid injection hole on the cover plate body; a second liquid injection channel is arranged on the shell and is in communication with the first liquid injection channel and the containing cavity; electrolyte 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 a pole group contained in the containing cavity. The battery can make the electrolyte flow into the containing cavity from the liquid injection hole through the first liquid injection channel and the second liquid injection channel, so that the electrolyte can realize directional infiltration to the pole group, and the infiltration effect is 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 the electrolyte and improve the soaking effect.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0006] A battery comprises a shell with a containing cavity and a cover plate assembly.

[0007] 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 the injection hole on the cover plate body.

[0008] 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. The 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.

[0009] 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 flow channel grooves spaced apart along the width direction of the lower plastic.

[0010] Further, a buffer groove is arranged at a position opposite to the liquid injection hole on the lower plastic part; the buffer groove is located on an extension path of the first flow channel groove, the first flow channel groove is communicated with the liquid injection hole through the buffer groove; and / or, the buffer groove is arranged in a spaced manner with the first flow channel groove, a connecting flow channel groove is arranged between the buffer groove and the first flow channel groove, and the first flow channel groove is communicated with the liquid injection hole through the connecting flow channel groove and the buffer groove.

[0011] Further, a plurality of first through holes for the electrolyte to pass through are arranged on the groove wall of the first flow channel groove; and / or, a plurality of second through holes for the electrolyte to pass through are arranged on the groove wall of the second flow channel groove.

[0012] Further, a protruding part is arranged on the lower plastic part, and the protruding part is located at both ends of the lower plastic part in the length direction; in the thickness direction of the lower plastic part, the size L1 of the protruding part is greater than the size L2 of the first liquid injection channel.

[0013] Further, the second liquid injection channel comprises a flow channel groove arranged on the inner wall of the shell, and the flow channel groove is communicated with the first liquid injection channel.

[0014] Further, the flow channel groove extends along the height direction of the shell and is arranged in a spaced manner, and each flow channel groove is communicated with the first liquid injection channel.

[0015] Further, part of the side wall of the shell arches outwards to the outside of the accommodating cavity and forms the flow channel groove communicated with the accommodating cavity; corresponding to the flow channel groove, a protruding part is arranged on the cover plate body, and the protruding part is blocked at the top end of the flow channel groove.

[0016] Compared with the related art, the application has the following advantages:

[0017] (1) The battery described in the application, by arranging the first liquid injection channel on the lower plastic part in the cover plate assembly and arranging the second liquid injection channel on the shell, the first liquid injection channel is communicated with the liquid injection hole, and the second liquid injection channel is communicated with the first liquid injection channel and the accommodating cavity in the shell, in this way, the electrolyte can flow into the accommodating cavity from the liquid injection hole and through the first liquid injection channel and the second liquid injection channel, thereby realizing the directional infiltration of the electrolyte to the pole group in the accommodating cavity, and being beneficial to improve the infiltration effect, so as to ensure the electrical performance of the battery.

[0018] (2) The first liquid injection channel comprises a first flow channel groove and a second flow channel groove, so that the first flow channel groove is communicated with the liquid injection hole and extends along the width direction of the lower plastic, and the second flow channel groove is communicated with the first flow channel groove and the second liquid injection channel, and the second flow channel groove is arranged in two in the width direction of the lower plastic. Compared with the arc or curved structure, the structure is relatively simple, and the preparation and molding of the first liquid injection channel are facilitated.

[0019] (3) The buffer groove opposite to the liquid injection hole is arranged on the lower plastic, which can buffer the electrolyte during liquid injection, so as to avoid the damage of the electrolyte to the pole piece during liquid injection. The buffer groove is arranged on the extension path of the first flow channel groove, so that the first flow channel groove is communicated with the liquid injection hole through the buffer groove. In this way, the electrolyte flows into the first flow channel groove from the liquid injection hole through the buffer groove. The structure is relatively compact, and the preparation and processing are facilitated. The buffer groove is arranged in the first flow channel groove, and a connecting flow channel groove is arranged between the buffer groove and the first flow channel groove, so that the first flow channel groove is communicated with the liquid injection hole through the connecting flow channel groove and the buffer groove. In this way, the electrolyte can flow into the first flow channel groove from the liquid injection hole through the connecting flow channel groove and the buffer groove.

[0020] (4) A plurality of first through holes are arranged on the groove wall of the first flow channel groove, so that the electrolyte in the first flow channel groove can be directly injected into the accommodating cavity in the shell through the plurality of first through holes, thereby facilitating the uniform infiltration of the electrolyte to the pole group. A plurality of second through holes are arranged on the groove wall of the second flow channel groove, so that the electrolyte in the second flow channel groove can be directly injected into the accommodating cavity in the shell through the plurality of second through holes, thereby also facilitating the uniform infiltration of the electrolyte to the pole group. The cooperation of the plurality of first through holes and the plurality of second through holes can make the electrolyte more uniformly infiltrate the pole group.

[0021] (5) The protruding part is arranged on the lower plastic, and the size of the protruding part in the thickness direction of the lower plastic is greater than the size of the first liquid injection channel. In this way, the pole group and the first liquid injection channel form a gap in the height direction of the shell, so that the electrolyte can flow smoothly into the accommodating cavity.

[0022] (6) The second liquid injection channel comprises a flow channel arranged on the inner wall of the shell, so that the flow channel is communicated with the first liquid injection channel. This structure facilitates the directional infiltration of the pole group, and facilitates the preparation and molding of the flow channel and the shell.

[0023] (7) The flow channel extends along the height direction of the shell and is arranged in a plurality of intervals, so that each flow channel is communicated with the first liquid injection channel. In this way, the electrolyte can quickly and directionally infiltrate the pole group along the plurality of flow channels, thereby reducing the infiltration time and improving the infiltration effect of the pole group.

[0024] (8) The part of the side wall of the shell is arched to the outside of the accommodating cavity, and a flow passage is formed in the position of the part of the side wall and communicates with the accommodating cavity, so that the shell and the flow passage are integrally formed.

[0025] The application also provides a battery pack, wherein the battery pack is provided with the battery.

[0026] The battery pack provided by the application can make the electrolyte flow into the accommodating cavity through the injection hole, the first injection channel and the second injection channel, so that the electrolyte can be directionally infiltrated into the pole group, the infiltration effect is improved, the performance of the battery is improved, and the performance of the battery pack is improved.

[0027] In addition, the application also provides a power consumption device, wherein the power consumption device is provided with the battery pack.

[0028] The power consumption device provided by the application can also make the electrolyte flow into the accommodating cavity through the injection hole, the first injection channel and the second injection channel, so that the electrolyte can be directionally infiltrated into the pole group, the infiltration effect is improved, the performance of the battery and the battery pack is improved, and the performance of the power consumption device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments of the present application and their descriptions serve the purpose of explaining the present application, and do not constitute improper limitations to the present application. In the drawings:

[0030] Figure 1 A perspective view of the battery cell described in the embodiments of the present application;

[0031] Figure 2 A front view of the battery cell described in the embodiments of the present application;

[0032] Figure 3 A Figure 2 A sectional view in the A-A direction;

[0033] Figure 4 A Figure 3 A local enlarged view at the cover plate assembly;

[0034] Figure 5 A structure schematic view of the cover plate assembly from a first perspective according to the embodiments of the present application;

[0035] Figure 6 A structure schematic view of the cover plate assembly from a second perspective according to the embodiments of the present application;

[0036] Figure 7 A structure schematic view of the shell according to the embodiments of the present application;

[0037] Reference Signs List:

[0038] 1, housing; 2, cover plate assembly;

[0039] 101, accommodating cavity; 102, flow channel;

[0040] 21, cover plate body; 22, lower plastic; 201, positive pole column; 202, negative pole column; 203, explosion-proof valve; 210, liquid injection hole; 211, protruding part; 220, protruding part; 10, first flow channel; 20, second flow channel; 30, buffer groove; 1001, first through hole; 2001, second through hole; 2002, communication port. DETAILED DESCRIPTION

[0041] In order to make the technical solutions of the present application and their advantages clearer and more understandable, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0042] It should be noted that the examples in the present application and the features in the examples can be combined with each other without conflict.

[0043] In addition, in the description of the present application, it should be noted that if the terms indicating the orientation or position relationship such as "upper", "lower", "inner", "outer" and the like appear, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, if the terms "first", "second" and the like appear, they are also used for description purposes only and cannot be understood as indicating or implying relative importance.

[0044] In addition, in the description of the present application, unless otherwise explicitly limited, the terms "mounting", "connection", "connection", "connector" should be understood broadly. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood in combination with the specific circumstances.

[0045] In this application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present application. Descriptive terms such as "exemplary" in the present specification do not necessarily refer to the same embodiment or example. Moreover, the described particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0046] In the following, the present application will be described in detail through exemplary embodiments. However, it should be understood that the elements, structures and features in one embodiment can be beneficially combined into other embodiments without further description.

[0047] The embodiments of the first aspect of the present application provide an electric core which can realize directional infiltration of electrolyte to the pole group, and is beneficial to improve the infiltration effect.

[0048] In the related art, the power battery is generally mainly composed of 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 includes a cover plate body and a lower plastic, and the lower plastic mainly plays an insulating role.

[0049] In the production process of the lithium battery, the electrolyte needs to be injected into the shell according to the required amount through the injection hole reserved in the cover plate assembly to infiltrate the pole group. In the current injection method, the electrolyte is injected into the shell through the injection hole, which leads to poor infiltration effect and needs to be further improved.

[0050] In view of this, in order to overcome the deficiencies existing in the related art, in the battery of the present embodiment, the Figures 1 to 7 , the overall design includes a shell 1 having a containing cavity 101, and a cover plate assembly 2.

[0051] The cover plate assembly 2 has a cover plate body 21 connected with the shell 1, and a lower plastic 22 connected on one side of the cover plate body 21. The lower plastic 22 is provided with a first injection channel, and the first injection channel is in communication with an injection hole 210 on the cover plate body 21. In addition, the shell 1 is provided with a second injection channel, and the second injection channel is in communication with the first injection channel and the containing cavity 101. The electrolyte flows into the containing cavity 101 through the first injection channel and the second injection channel from the injection hole 210, and can infiltrate the pole group contained in the containing cavity 101.

[0052] Thus, by setting the first liquid injection channel on the lower plastic part in the cover plate assembly 2, and the second liquid injection channel on the shell 1, the first liquid injection channel is in communication with the liquid injection hole 210, and the second liquid injection channel is in communication with the first liquid injection channel and the accommodating cavity 101 in the shell 1, so that the electrolyte can flow into the accommodating cavity 101 from the liquid injection hole 210, through the first liquid injection channel and the second liquid injection channel, thereby realizing the directional infiltration of the electrolyte to the pole group in the accommodating cavity 101, and facilitating the improvement of the infiltration effect.

[0053] Based on the above overall introduction, specifically, continuing to combine the embodiments shown in Figures 1 to 7 , the battery comprises a shell 1 and a cover plate assembly 2, the shell 1 forms an accommodating cavity 101 therein, and a pole group is installed in the accommodating cavity 101. The cover plate assembly 2 comprises a cover plate body 21 welded to the shell 1, and a lower plastic 22 connected to the cover plate body 21 near the side of the accommodating cavity 101.

[0054] The battery further comprises a positive pole 201, a negative pole 202, and a pressure relief valve 203, wherein the positive pole 201 and the negative pole 202 are arranged in the pole hole on the cover plate body 21, and partially located in the via hole on the lower plastic 22 opposite to the pole hole, and the positive pole 201 and the negative pole 202 are insulated from the cover plate body 21 through the lower plastic 22, and the positive pole 201 and the negative pole 202 are respectively electrically connected to the positive and negative tabs in the pole group. The pressure relief valve 203 is located between the positive pole 201 and the negative pole 202, and the cover plate body 21 is also provided with a liquid injection hole 210.

[0055] Combining the embodiments shown in Figures 3 to 6 , in some exemplary implementation forms, the first liquid injection channel comprises a first flow channel groove 10 in communication with the liquid injection hole 210, and a second flow channel groove 20 in communication with the first flow channel groove 10 and the second liquid injection channel. And the first flow channel groove 10 extends along the width direction of the lower plastic 22, and the second flow channel groove 20 extends along the length direction of the lower plastic 22, and the second flow channel groove 20 is two spaced apart along the width direction of the lower plastic 22. Specifically, the electrolyte flows from the liquid injection hole 210, through the first flow channel groove 10 and the second flow channel groove 20 to the second liquid injection channel, and then is injected into the accommodating cavity 101 to directionally infiltrate the pole group.

[0056] At this time, the first liquid injection channel comprises the first flow channel groove 10 and the second flow channel groove 20, so that the first flow channel groove 10 is in communication with the liquid injection hole 210 and extends along the width direction of the lower plastic 22, and the second flow channel groove 20 communicates the first flow channel groove 10 and the second liquid injection channel, and the second flow channel groove 20 is two spaced apart along the width direction of the lower plastic 22. Compared with the arc-shaped or curved structure, this structure is relatively simple, and is convenient for the preparation and molding of the first liquid injection channel.

[0057] Due to the liquid injection hole 210 arranged on the battery cover plate, the positive group is directly below the liquid injection hole 210. During the liquid injection process, the high-speed flowing electrolyte fluid is prone to impact the positive group directly below, causing the positive plate to wrinkle or be damaged, the electrolyte diffusion range to be small, leading to long immersion time and poor immersion effect, and further affecting the performance of the battery cell, and even causing safety risks in severe cases.

[0058] To this end, in the present embodiment, in combination with the above-mentioned Figures 3 to 6 In some example embodiments, a buffer groove 30 is arranged at a position opposite to the liquid injection hole 210 on the lower plastic 22. The buffer groove 30 can buffer the electrolyte during liquid injection, avoiding the electrolyte from impacting the positive group during liquid injection, thereby preventing the positive plate from being damaged. In terms of specific structure, as one of the feasible implementation manners, the buffer groove 30 is located on the extension path of the first flow channel groove 10, and the first flow channel groove 10 is in communication with the liquid injection hole 210 through the buffer groove 30. At this time, the electrolyte flows into the first flow channel groove 10 from the liquid injection hole 210 through the buffer of the buffer groove 30. This structure is relatively compact and convenient to manufacture and process.

[0059] In specific implementation, the buffer groove 30 is integrally formed on the lower plastic 22 with the first flow channel groove 10. The buffer groove 30 is located at the middle position of the first flow channel groove 10, and in the length direction of the lower plastic 22, the size of the buffer groove 30 is greater than that of the first flow channel groove 10, so as 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.

[0060] As another feasible implementation manner, in the present embodiment, for example, the buffer groove 30 is arranged separately from the first flow channel groove 10, and a connecting flow channel groove is arranged between the buffer groove 30 and the first flow channel groove 10. The first flow channel groove 10 is in communication with the liquid injection hole 210 through the connecting flow channel groove and the buffer groove 30. At this time, the electrolyte flows into the first flow channel groove 10 from the liquid injection hole 210 through the connecting flow channel groove and the buffer groove 30.

[0061] In specific implementation, one end of the connecting flow channel groove is in communication with the buffer groove 30, and the other end of the connecting flow channel groove is in communication with the first flow channel groove 10. The connecting flow channel groove can extend straight along the length direction of the lower plastic 22, or can be in an arc shape, as long as the connecting flow channel groove is in communication with the buffer groove 30 and the first flow channel groove 10.

[0062] On the basis of arranging the first flow channel groove 10 and the second flow channel groove 20, in combination with the above-mentioned Figure 6 In some example embodiments, a plurality of first through holes 1001 for the electrolyte to pass through are arranged on the groove wall of the first flow channel groove 10. In this way, the electrolyte in the first flow channel groove 10 can be directly injected into the accommodating cavity 101 in the shell 1 through the plurality of first through holes 1001, thereby facilitating the electrolyte to uniformly immerse the positive group.

[0063] Furthermore, the second flow channel groove 20 is provided with a plurality of second through holes 2001 for electrolyte to pass through. The plurality of second through holes 2001 can allow the electrolyte in the second flow channel groove 20 to be directly injected into the accommodating cavity 101 in the shell 1 through the plurality of second through holes 2001, and also facilitate the electrolyte to uniformly soak the pole group. Meanwhile, the cooperation of the plurality of first through holes 1001 and the plurality of second through holes 2001 can make the electrolyte more uniformly soak the pole group.

[0064] 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 side wall opposite to the pole group, and the plurality of first through holes 1001 and the plurality of second through holes 2001 are preferably uniformly distributed, which can further improve the uniformity of the pole group soaking.

[0065] In addition, it is also worth noting that the number of the first through holes 1001 and the second through holes 2001 can be set to be the same, or can be set to be different, and the number is preferably greater than two. It is also worth noting that the size of the first through holes 1001 and the second through holes 2001 is preferably the same, so as to facilitate the preparation and processing, and the cross-sectional area of the first through holes 1001 and the second through holes 2001 is not less than 1mm 2 It is understood here that the cross-sectional area of the first through holes 1001 and the second through holes 2001 can be set according to the actual situation under the premise of ensuring the structural strength of the lower plastic 22.

[0066] In addition, it is also worth emphasizing that the buffer groove 30 is opposite to the liquid injection hole 210, and considering the buffering effect on the electrolyte, the groove wall of the buffer groove 30 is not provided with through holes. If the buffer groove 30 is set to be large enough to avoid the position opposite to the liquid injection hole 210, and can play a good buffering effect on the electrolyte, the groove wall of the buffer groove 30 can also be provided with through holes of appropriate size or appropriate number.

[0067] Continuing to refer to the Figure 6 In some exemplary embodiments, the lower plastic 22 is provided with a protruding portion 220 at both ends in the length direction of the lower plastic 22. In the thickness direction of the lower plastic 22, the size L1 of the protruding portion 220 is greater than the size L2 of the first liquid injection channel, for example.

[0068] As shown in the above structure, the protruding portion 220 can be used to limit the position of the pole group in the accommodating cavity 101. The size L1 of the protruding portion 220 in the thickness direction of the lower plastic 22 is greater than the size L2 of the first liquid injection channel. After the battery cell is assembled, the protruding portion 220 can press the diaphragm in the pole group, and the pole group and the first liquid injection channel have a gap in the height direction of the shell 1, so that the electrolyte can flow smoothly into the accommodating cavity 101.

[0069] Continuing to refer to the examples shown in Figure 1 , Figure 3 , Figure 4 and Figure 7 , in some example embodiments, for example, the second liquid injection channel includes a flow channel 102 arranged on the inner wall of the shell 1, and the flow channel 102 is in communication with the first liquid injection channel. In this structure, the pole group can be oriented and soaked, and the flow channel 102 and the shell 1 are easily manufactured.

[0070] Specifically, continuing to refer to the examples shown in Figure 1 , Figure 3 , Figure 4 and Figure 7 , in some example embodiments, the flow channel 102 extends along the height direction of the shell 1, and a plurality of flow channels 102 are arranged at intervals, and each flow channel 102 is in communication with the first liquid injection channel. In this way, the electrolyte can quickly and directionally soak the pole group along the plurality of flow channels 102, reducing the soaking time and improving the soaking effect of the pole group.

[0071] In specific implementation, the flow channel 102 is preferably arranged on the opposite two large faces of the shell 1, and a plurality of flow channels are arranged at intervals on each large face. The portion near the top of the plurality of flow channels on each large face is in communication with the second flow channel 20 on the same side. For example, a communication port 2002 is arranged on the second flow channel 20 corresponding to each flow channel, and the second flow channel 20 is in communication with the plurality of flow channels through the corresponding communication ports 2002.

[0072] Referring to the examples shown in Figure 7 , in some example embodiments, part of the side wall of the shell 1 arches outwardly of the accommodating cavity 101 and forms a flow channel 102 in communication with the accommodating cavity 101. This structure facilitates the integrated manufacturing of the shell 1 and the flow channel 102. Moreover, the cover plate body 21 is provided with a protruding portion 211 corresponding to the flow channel 102, and the protruding portion 211 seals the top end of the flow channel 102. In specific implementation, the cover plate body 21 is sealed and connected with the shell 1 by the protruding portion 211 sealing the top end of the flow channel 102.

[0073] It should be noted that the flow channel 102 can also adopt other structural forms in addition to the forming mode of arching outwards to the outside of the accommodation cavity 101 by using part of the side wall of the shell 1. For example, a plurality of partitions are arranged on the inner wall of the shell 1, each partition has a first plate body and a second plate body, and the first plate body and the second plate body are connected in an L shape. In specific implementation, one end of each partition, for example, the first plate body is connected to the inner wall of the shell 1, and the second plate body is used to abut against the large face of the support pole group. At this time, the gap between the adjacent two partitions in the plurality of partitions forms the flow channel 102, and such arrangement is also feasible.

[0074] It should be noted that, for the battery cell of the embodiment, based on the above exemplary implementation forms, as a preferred embodiment, the shell 1 and the cover plate assembly 2 are still included as shown in the following. Figures 1 to 7 The shell 1 has an accommodation cavity 101 for accommodating the pole group formed inside. The cover plate assembly 2 has a cover plate body 21 connected to the shell 1, and a lower plastic 22 connected to one side of the cover plate body 21. The lower plastic 22 is formed with a first liquid injection channel. The first liquid injection channel is in communication with a liquid injection hole 210 on the cover plate body 21. The shell 1 is formed with a second liquid injection channel. The second liquid injection channel is in communication with the first liquid injection channel and the accommodation cavity 101. Electrolyte flows into the accommodation cavity 101 through the first liquid injection channel and the second liquid injection channel from the liquid injection hole 210, and can infiltrate the pole group accommodated in the accommodation cavity 101.

[0075] Among them, the groove wall of the first flow channel groove 10 is provided with a plurality of first through holes 1001 for electrolyte to pass through, and the plurality of first through holes 1001 are uniformly and spacedly arranged along the extension direction of the first flow channel groove 10. And, the groove wall of the second flow channel groove 20 is also provided with a plurality of second through holes 2001 for electrolyte to pass through, and the plurality of second through holes 2001 are uniformly and spacedly arranged along the extension direction of the second flow channel groove 20.

[0076] Among them, the lower plastic 22 is provided with a protruding part 220, the protruding part 220 is located at both ends of the length direction of the lower plastic 22, and in the thickness direction of the lower plastic 22, the size of the protruding part 220 is greater than the size of the first liquid injection channel.

[0077] Among them, the second liquid injection channel includes a flow channel 102 arranged on the inner wall of the shell 1, and the flow channel 102 is in communication with the first liquid injection channel. And, the flow channel 102 extends along the height direction of the shell 1, and is spacedly arranged in a plurality of, preferably, a plurality of flow channels 102 are spacedly arranged on the opposite two large faces of the shell 1, and each flow channel 102 is in communication with the second flow channel groove 20.

[0078] Part of the side wall of the shell 1 arches outwards to the outside of the accommodation cavity 101 and forms a flow-through groove 102 in communication with the accommodation cavity 101, and a protruding portion 211 is arranged on the cover plate body 21 corresponding to the flow-through groove 102, and the protruding portion 211 seals the top end of the flow-through groove 102.

[0079] In specific implementation, the flow path of the electrolyte is as shown in Figure 4 and Figure 6 The electrolyte flows from the liquid injection hole 210, passes through the buffer groove 30, the first flow channel groove 10, the second flow channel groove 20, and the communication groove, and is injected into the bottom of the electrode group in the accommodation cavity 101, and at the same time, part of the electrolyte flowing through the first flow channel groove 10 and the second flow channel groove 20 flows into the top of the electrode group through the first through hole 1001 and the second through hole 2001, so that the electrode group can be quickly and directionally soaked, the soaking time is reduced, and the soaking effect of the electrode group is improved.

[0080] In the above preferred embodiment, the specific arrangement and arrangement mode of the first liquid injection channel, the second liquid injection channel, the first flow channel groove 10, the second flow channel groove 20, the buffer groove 30, the first through hole 1001, the second through hole 2001, and the flow-through groove 102 can be referred to the description in the above exemplary embodiments, and in the preferred embodiment, the first liquid injection channel, the second liquid injection channel, the first flow channel groove 10, the second flow channel groove 20, the buffer groove 30, the first through hole 1001, the second through hole 2001, and the flow-through groove 102 also have the beneficial effects brought by the design, which can be referred to the description in the above exemplary embodiments.

[0081] The battery cell of the embodiment is designed as above, the first liquid injection channel and the second liquid injection channel are arranged, the first liquid injection channel is in communication with the liquid injection hole 210, and the second liquid injection channel is in communication with the first liquid injection channel and the accommodation cavity 101 in the shell 1, so that the electrolyte can flow from the liquid injection hole 210 and directionally flow into the accommodation cavity 101 through the first liquid injection channel and the second liquid injection channel, thereby realizing the directional soaking of the electrolyte to the electrode group in the accommodation cavity 101 and improving the soaking effect, so as to ensure the electrical performance of the battery.

[0082] The embodiment of the second aspect of the application provides a battery pack, which is provided with the battery as described above.

[0083] The battery pack of the embodiment can realize the directional soaking of the electrolyte to the electrode group by using the above-mentioned battery, so as to improve the soaking effect, improve the performance of the battery, and improve the performance of the battery pack.

[0084] The embodiment of the third aspect of the present application provides a power utilization device, wherein the power utilization device is provided with the battery pack.

[0085] The power utilization device of the embodiment can also make the electrolyte flow into the accommodating cavity 101 through the first liquid injection channel and the second liquid injection channel from the liquid injection hole 210, so that the electrolyte can be directionally infiltrated to the pole group, thereby improving the infiltration effect, improving the performance of the battery and the battery pack, and improving the performance of the power utilization device.

[0086] The above only describes some embodiments of the present application and is not used to limit the present application. The technical features or structures in the foregoing different embodiments can be combined as needed to form other specific technical solutions. Various modifications and changes can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present 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 pole group accommodated in the receiving cavity; 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; 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. 2.The battery of claim 1, 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. 3.The battery of 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. 4.The battery of any one of claims 1 to 3, 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. 5.The battery of claim 4, 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. 6.The battery of claim 4, 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; a protruding part is arranged on the cover plate body corresponding to the flow channel groove, and the protruding part is blocked at the top end of the flow channel groove. 7.A battery pack, characterized in that: the battery pack comprises the battery of any one of claims 1 to 6. 8.An electric device, characterized in that: the electric device comprises the battery pack of claim 7. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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