Battery

Abstract

The invention belongs to the technical field of batteries, and particularly discloses a battery, a battery cover plate or a shell of the battery is provided with a first liquid injection hole, a plastic part body is provided with a second liquid injection hole communicated with the first liquid injection hole, and a flow guide supporting part is positioned on one side, close to an accommodating cavity, of the plastic part body. The flow guide supporting part comprises a cylinder and a flow baffle assembly, the end, in the first direction, of the cylinder is connected to the plastic part body in the circumferential direction of the second liquid injection hole, a first circulation opening is formed in the other end, in the first direction, of the cylinder, a second circulation opening penetrating through the cylinder is formed in the circumferential direction of the cylinder, and the first circulation opening and the second circulation opening both communicate with the second liquid injection hole; the flow baffle assembly is connected to the inner wall of the barrel. Through the flow baffle assembly, the electrolyte can be prevented from directly impacting the pole group, and a good protection effect on the pole group is achieved. In the vacuumizing process, the barrel can support the insulating tape wrapping the pole lugs of the pole group, the situation that the second liquid injection hole is blocked by the insulating tape is avoided, the liquid injection efficiency is high, and vacuumizing is easy to achieve.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a battery. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. As a component of a lithium-ion battery, the battery cover assembly first plays a sealing role by isolating the internal and external environments after being welded to the housing, and secondly connects the internal and external circuits, and conveys the current inside the battery to the outside through the pole column of the battery cover assembly, playing a role in guiding the current. A traditional battery cover assembly generally includes a battery cover, a pole column, an upper plastic part, and a lower plastic part. After the battery cover is welded to the housing, a closed space is formed between the battery cover and the housing, and the electrode group is arranged in the closed space. The electrode group is provided with electrode tabs, and the electrode tabs are electrically connected to the pole column through connecting pieces.

[0003] Generally, injection holes are provided on the battery cover and the lower plastic part, and electrolyte is injected into the housing through the injection holes. However, during the injection process, the electrolyte will directly impact the electrode group, easily causing damage to the electrode group and affecting the capacity of the battery. And during the injection process, it is also necessary to intermittently evacuate the housing through the injection holes to ensure the smooth injection of the electrolyte and the injection volume meets the requirements. In order to make reasonable use of the layout space on the battery cover, the injection holes on the lower plastic part may be arranged above the connection area between the connecting piece and the electrode tab. The connection area between the connecting piece and the electrode tab is coated with insulating tape. When injecting or evacuating through the injection holes, the insulating tape will adhere to the end face of the lower plastic part facing the electrode group, blocking the injection holes, slowing down the injection rate, and affecting the production efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery, in which a diversion and support part is provided on the plastic part, avoiding the direct impact of the electrolyte on the electrode group, and the diversion and support part can support the insulating tape, avoiding the insulating tape covering the second injection hole on the plastic part, so that the electrolyte flows smoothly, and the injection efficiency and evacuation efficiency are relatively high.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] The present invention provides a battery, including:

[0007] A battery cover;

[0008] A housing, connected to the battery cover and enclosing to form a containing cavity, and one of the battery cover and the housing is provided with a first injection hole;

[0009] The plastic part is arranged on one side of the battery cover plate or the housing close to the accommodating cavity. The plastic part includes a plastic part body and a diversion and support part. A second liquid injection hole communicating with the first liquid injection hole is provided on the plastic part body, and the diversion and support part is located on one side of the plastic part body close to the accommodating cavity;

[0010] The diversion and support part includes a cylinder body and a baffle plate assembly. One end of the cylinder body in the first direction is connected to the plastic part body around the second liquid injection hole. The other end of the cylinder body in the first direction forms a first flow port. A second flow port penetrating through the cylinder body is provided on the circumferential direction of the cylinder body. Both the first flow port and the second flow port are communicated with the second liquid injection hole, and the baffle plate assembly is connected to the inner wall of the cylinder body.

[0011] Optionally, the baffle plate assembly includes at least one first baffle plate and at least one second baffle plate. The first baffle plate and the second baffle plate are arranged at intervals and alternately in the first direction, and the length direction of the first baffle plate is arranged at an angle with the length direction of the second baffle plate.

[0012] Optionally, both the first baffle plate and the second baffle plate are parallel to the plastic part body, and the length direction of the first baffle plate is perpendicular to the length direction of the second baffle plate.

[0013] Optionally, a plurality of second flow ports are provided. The plurality of second flow ports are evenly arranged at intervals in the circumferential direction of the cylinder body, and the second flow ports are arranged on one side of the baffle plate assembly close to the plastic part body.

[0014] Optionally, the first liquid injection hole and the second liquid injection hole are circular holes. The diameter of the second liquid injection hole is φE, and the diameter of the first liquid injection hole is φD;

[0015] The relationship between φE and φD satisfies: 1.2φD ≤ φE ≤ 1.5φD;

[0016] The value range of φD is: 2mm ≤ φD ≤ 5mm.

[0017] Optionally, the width of the first baffle plate is b, and b < φE;

[0018] The relationship between b and φD satisfies: 0.8φD ≤ b ≤ 1.1φD;

[0019] The value range of b is: 1.6mm ≤ b ≤ 5.5mm.

[0020] Optionally, along the first direction, the distance between the end face of the cylinder body close to the accommodating cavity and the end face of the plastic part body close to the accommodating cavity is h1;

[0021] The value range of h1 is 2mm ≤ h1 ≤ 10mm.

[0022] Optionally, the battery further includes a pole group disposed in the accommodating cavity. A pressing portion is provided on a side of the plastic part body facing away from the battery cover plate or the housing, and the pressing portion abuts against the pole group;

[0023] Along a first direction, the distance between an end face of the pressing portion facing the pole group and an end face of the plastic part body facing the pole group is h2, and h1 < h2;

[0024] The value range of h2 is: 1.5 mm ≤ h2 ≤ 16 mm.

[0025] Optionally, an exhaust portion is provided on a side of the plastic part body facing away from the battery cover plate or the housing. A plurality of air holes are provided in the exhaust portion. A bursting hole is provided in the battery cover plate or the housing, and an explosion-proof valve is provided in the bursting hole. The air holes communicate the accommodating cavity with a pressure relief channel after the explosion-proof valve is opened;

[0026] Along the first direction, the distance between an end face of the exhaust portion facing the pole group and an end face of the plastic part body facing the pole group is h3, and h1 < h3 ≤ h2;

[0027] The value range of h3 is: 1.5 mm ≤ h3 ≤ 16 mm.

[0028] Optionally, the plastic part body includes a first part and a second part, and the second liquid injection hole and the flow guiding and supporting portion are disposed on the first part.

[0029] The beneficial effects of the present invention are as follows:

[0030] The present invention provides a battery, including a battery cover plate, a housing and a plastic part. A first liquid injection hole is provided in the battery cover plate or the housing, and the plastic part is clamped between the battery cover plate / housing and the pole group. The plastic part includes a plastic part body and a flow guiding and supporting portion. A second liquid injection hole communicating with the first liquid injection hole is provided in the plastic part body, and the flow guiding and supporting portion is located on a side of the plastic part body close to the accommodating cavity. The flow guiding and supporting portion includes a cylinder body and a baffle plate assembly. One end of the cylinder body in the first direction is connected to the plastic part body circumferentially around the second liquid injection hole. The other end of the cylinder body in the first direction forms a first flow port. A second flow port penetrating through the cylinder body is provided in the circumferential direction of the cylinder body. Both the first flow port and the second flow port communicate with the second liquid injection hole, and the baffle plate assembly is connected to the inner wall of the cylinder body. By providing the baffle plate assembly in the cylinder body, the baffle plate assembly can be used to buffer the electrolyte, avoiding the direct impact of the electrolyte on the pole group and playing a good role in protecting the pole group. In addition, during vacuum pumping, the cylinder body can also well support the insulating tape covering the pole lugs of the pole group, avoiding the situation that the insulating tape blocks the second liquid injection hole, with high liquid injection efficiency and easy vacuum pumping. Description of the Drawings

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the content of the embodiments of the present invention and these drawings.

[0032] Figure 1 It is a schematic structural diagram of a battery cover plate and a plastic part provided in the first embodiment of the present invention;

[0033] Figure 2 is Figure 1 The partial enlarged view at A in;

[0034] Figure 3 It is a schematic structural diagram of the first part of the plastic part provided in the first embodiment of the present invention;

[0035] Figure 4 is Figure 3 The partial enlarged view at B in;

[0036] Figure 5 It is a top view of the first part of the plastic part provided in the first embodiment of the present invention;

[0037] Figure 6 is Figure 5 The sectional view of the C-C section in;

[0038] Figure 7 It is a top view of the battery provided in the first embodiment of the present invention;

[0039] Figure 8 is Figure 7 The sectional view of the D-D section in;

[0040] Figure 9 is Figure 8 The partial enlarged view at E in;

[0041] Figure 10 is Figure 8 The partial enlarged view at E in (excluding the sealing component);

[0042] Figure 11 is Figure 8 The partial enlarged view at F in.

[0043] In the figure:

[0044] 100, Battery cover plate; 110, First liquid injection hole; 111, Sunk platform; 120, Annular boss; 130, Blasting hole; 140, Sealing assembly; 141, Sealing nail; 142, Sealing cover; 200, Housing; 300, Plastic part; 310, Plastic part body; 311, First branch; 3111, Second liquid injection hole; 3112, Transition surface; 312, Second branch; 320, Flow guiding and supporting part; 321, Cylinder body; 3211, First flow port; 3212, Second flow port; 322, First baffle; 323, Second baffle; 330, Pressing part; 340, Exhaust part; 341, Air hole; 350, Reinforcing rib; 400, Electrode group; 500, Explosion-proof valve; 600, Explosion-proof valve protection patch. Detailed implementation manners

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0046] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0047] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and over", and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and under", and "under the bottom of" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0048] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", and "right" are based on the orientation or positional relationships shown in the drawings. They are only for convenience of description and simplifying operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0049] Embodiment 1

[0050] As Figure 1 、 Figure 7 and Figure 8 shown, this embodiment provides a battery, which includes a battery cover plate 100, a housing 200, a pole group 400, and a plastic part 300. The battery cover plate 100 and the housing 200 together enclose a receiving cavity for installing the pole group 400 and the plastic part 300. A first liquid injection hole 110 is provided on the battery cover plate 100, and the plastic part 300 is clamped between the battery cover plate 100 and the pole group 400.

[0051] The plastic part 300 includes a plastic part body 310 and a flow guiding and supporting part 320. A second liquid injection hole 3111 communicating with the first liquid injection hole 110 is provided on the plastic part body 310. The flow guiding and supporting part 320 is located on the side of the plastic part body 310 close to the receiving cavity. The flow guiding and supporting part 320 includes a cylinder body 321 and a baffle plate assembly. One end of the cylinder body 321 in the first direction is connected to the plastic part body 310 around the second liquid injection hole 3111. The other end of the cylinder body 321 in the first direction forms a first flow port 3211. A second flow port 3212 penetrating through the cylinder body 321 is provided on the circumference of the cylinder body 321. Both the first flow port 3211 and the second flow port 3212 are communicated with the second liquid injection hole 3111. The baffle plate assembly is connected to the inner wall of the cylinder body 321. When injecting liquid, the electrolyte can enter the receiving cavity from the first liquid injection hole 110, the second liquid injection hole 3111, and the first flow port 3211, or can enter the receiving cavity from the first liquid injection hole 110, the second liquid injection hole 3111, and the second flow port 3212. Among them, the first direction is Figure 1 the Z-axis direction shown in

[0052] By arranging a baffle plate assembly in the cylinder body 321, the baffle plate assembly can be used to buffer the electrolyte, avoid the electrolyte directly impacting the pole group 400, and play a good protective role for the pole group 400. In addition, when evacuating, the cylinder body 321 can also well support the insulating tape wrapped around the pole ear of the pole group 400. Even if the insulating tape is attached to the end face of the cylinder body 321 close to the pole group 400, the electrolyte can enter the receiving cavity from the second flow port 3212, avoiding the situation that the insulating tape completely blocks the second liquid injection hole 3111, ensuring a relatively high liquid injection efficiency and easy realization of evacuation.

[0053] See also Figures 2 - 4 The baffle assembly includes at least one first baffle 322 and at least one second baffle 323. The first baffles 322 and the second baffles 323 are spaced and alternately arranged along a first direction. The length direction of the first baffles 322 and the length direction of the second baffles 323 are arranged at an angle. In this embodiment, one first baffle 322 and one second baffle 323 are used as an example. The first baffle 322 is positioned on the side close to the plastic body 310, and the second baffle 323 is positioned on the side close to the electrode assembly 400.

[0054] In some embodiments, the first baffle 322 and the second baffle 323 are both parallel to the plastic body 310, and the end face of the second baffle 323 facing away from the plastic body 310 is flush with the end face of the cylinder 321 facing away from the plastic body 310. Therefore, when the insulating tape wrapped around the tab arches toward the flow guide support portion 320, the second baffle 323 can also support the insulating tape. Optionally, the length direction of the first baffle 322 is perpendicular to the length direction of the second baffle 323. The length direction of the first baffle 322 is parallel to the length direction of the plastic body 310, and the length direction of the plastic body 310 is as shown in FIG. Figure 1 The length direction of the second baffle 323 is parallel to the width direction of the plastic body 310. The width direction of the plastic body 310 is shown as Figure 1 The Y-axis direction is shown in FIG.

[0055] Of course, in other embodiments, multiple first baffles 322 and multiple second baffles 323 may be selectively provided based on the different heights of the barrel 321 along the first direction, with the first baffles 322 and the second baffles 323 being alternately arranged along the first direction. The angle between adjacent first baffles 322 and second baffles 323 may also be less than 90°. For example, the angle between the lengthwise direction of the first baffle 322 and the lengthwise direction of the second baffle 323 may be set to 30°, 45°, or 60°, etc., and may be flexibly arranged as needed.

[0056] In this embodiment, multiple second flow openings 3212 are provided, and the multiple second flow openings 3212 are evenly spaced around the circumference of the cylinder 321, so that the electrolyte can flow evenly from the four sides of the guide support portion 320 to the accommodating cavity, which makes the injection smoother and facilitates the rapid and uniform immersion of the electrode group 400. Furthermore, the second flow openings 3212 are provided on the side of the baffle assembly close to the plastic body 310. This makes the distance between the second flow openings 3212 and the electrode group 400 relatively large along the first direction, preventing the second flow openings 3212 from being blocked by the bulging insulating tape, and ensuring that the electrolyte can at least be injected into the accommodating cavity through the first injection hole 110, the second injection hole 3111, and the second flow opening 3212.

[0057] See alsoFigure 9 and Figure 10 , the first liquid injection hole 110 and the second liquid injection hole 3111 are circular holes. The diameter of the second liquid injection hole 3111 is φE, and the diameter of the first liquid injection hole 110 is φD. The relationship between φE and φD satisfies: 1.2φD ≤ φE ≤ 1.5φD. The value range of φD is: 2 mm ≤ φD ≤ 5 mm. For example, the value of φD can be 2 mm, 3 mm, 4 mm, or 5 mm. By controlling the diameter φD of the first liquid injection hole 110 within the above range, it can be ensured that when injecting liquid or evacuating, the flow area of the first liquid injection hole 110 is large enough to meet the usage requirements of liquid injection and evacuation. When the value of φD is 2 mm, the value of the diameter φE of the second liquid injection hole 3111 can be 2.4 mm, 2.6 mm, 2.8 mm, or 3.0 mm, etc. When the value of φD is 5 mm, the value of the diameter φE of the second liquid injection hole 3111 can be 6.0 mm, 6.5 mm, 7.0 mm, or 7.5 mm, etc.

[0058] Furthermore, the width of the first baffle 322 is b. The relationship between b and φD satisfies: 0.8φD ≤ b ≤ 1.1φD, and b < φE. The value range of b is: 1.6 mm ≤ b ≤ 5.5 mm. For example, when the value of φD is 2 mm and the value of φE is 3.0 mm, the value of b can be 1.6 mm, 2.0 mm, or 2.2 mm, etc. When the value of φD is 5 mm and the value of φE is 7.0 mm, the value of b can be 4.0 mm, 5.0 mm, or 5.5 mm, etc. By restricting the value of b within the above range, the baffle assembly can play a good buffering role for the electrolyte, and at the same time ensure that the electrolyte can flow smoothly through the first flow port 3211. Otherwise, when the value of b is too small, the buffering effect of the baffle assembly on the electrolyte is not good, and the force of the electrolyte impacting the electrode group 400 is relatively large; when the value of b is too large, the space available for the electrolyte to flow in the cylinder body 321 decreases, the electrolyte does not flow smoothly at the first flow port 3211, and liquid overflow occurs during liquid injection.

[0059] Optionally, in this embodiment, an annular boss 120 is provided circumferentially on the first liquid injection hole 110. The annular boss 120 is in an inverted cone shape, and its small end faces the electrode group 400. The inner wall of the second liquid injection hole 3111 is connected to the end face on the side of the plastic part body 310 away from the electrode group 400 through a transition surface 3112. The transition surface 3112 cooperates with the inverted cone-shaped annular boss 120 for guiding, so that the end of the annular boss 120 close to the electrode group 400 can be smoothly inserted into the second liquid injection hole 3111, and the positioning between the battery cover 100 and the plastic part 300 is accurate, and the assembly accuracy is high. Further, there is a small gap between the annular boss 120 and the transition surface 3112 to facilitate the assembly of the two, avoid interference, and can play a good guiding role.

[0060] See Figure 5 andFigure 6 and Figure 9 Along the first direction, the distance between the end face of the cylinder body 321 close to the accommodation cavity and the end face of the plastic part body 310 close to the accommodation cavity is h1. The value range of h1 is 2mm ≤ h1 ≤ 10mm. By limiting the value of h1 within the above range, it is ensured that the cylinder body 321 can provide good support for the insulating tape and ensure a relatively high electrolyte injection rate. Otherwise, when the value of h1 is too small, the insulating tape cannot be well supported, and it is easy to occur that the second injection hole 3111 and the second communication port 3212 are blocked, resulting in low injection efficiency.

[0061] Furthermore, the battery further includes a pole group 400, the pole group 400 is arranged in the accommodation cavity, and a pressing part 330 is provided on the side of the plastic part body 310 facing away from the battery cover plate 100, and the pressing part 330 abuts against the pole group 400. Along the first direction, the distance between the end face of the pressing part 330 facing the pole group 400 and the end face of the plastic part body 310 facing the pole group 400 is h2, and h1 < h2. By ensuring h1 < h2, interference between the cylinder body 321 and the pole group 400 is avoided, and good battery assembly is ensured. Optionally, the value range of h2 is: 1.5mm ≤ h2 ≤ 16mm. For example, when h1 is 0.8mm, h2 can be 1.5mm, 2.0mm, etc. When h1 is 2mm, h2 can be 2.5mm, 3.0mm or 5mm, etc. When h1 is 8mm, h2 can be 8.5mm, 10.0mm or 16mm, etc.

[0062] See Figure 5 、 Figure 6 and Figure 11 As shown in FIGS. [FIG NUMBERS], a venting part 340 is provided on the side of the plastic part body 310 facing away from the battery cover plate 100. A plurality of air holes 341 are provided on the venting part 340. A bursting hole 130 is provided on the battery cover plate 100, and an explosion-proof valve 500 is provided in the bursting hole 130. Along the first direction, the projection of the explosion-proof valve 500 on the battery cover plate 100 partially coincides with the projection of the venting part 340 on the battery cover plate 100, and the air holes 341 communicate the accommodation cavity with the pressure relief channel after the explosion-proof valve 500 is opened. Thus, when the battery is in thermal runaway, the high-temperature and high-pressure gas can act on the explosion-proof valve 500 to open it for pressure relief, thereby ensuring the safety of the battery and avoiding the risk of explosion.

[0063] Optionally, an explosion-proof valve protection patch 600 is further provided on the side of the battery cover plate 100 facing away from the plastic part body 310. Along the first direction, the projection of the explosion-proof valve protection patch 600 on the battery cover plate 100 covers the projection of the bursting hole 130 on the battery cover plate 100, so that the explosion-proof valve protection patch 600 can shield the bursting hole 130, so that the explosion-proof valve protection patch 600 can protect the explosion-proof valve 500 and prevent the electrolyte from flowing to the explosion-proof valve 500 through the bursting hole 130 to corrode the explosion-proof valve 500.

[0064] Along the first direction, the distance between the end face of the exhaust part 340 facing the side of the electrode group 400 and the end face of the plastic part body 310 facing the side of the electrode group 400 is h3, where h1 < h3 ≤ h2. By ensuring h1 < h3 ≤ h2, the excessive pressing force between the exhaust part 340 and the electrode group 400 is avoided, which may cause damage to the electrode group 400 and ensure good battery assembly. Optionally, the value range of h3 is: 1.5 mm ≤ h3 ≤ 16 mm. For example, when h1 is 0.8 mm and h2 is 2.0 mm, h3 can be 1.5 mm or 2.0 mm, etc. When h1 is 2 mm and h2 is 2.5 mm, h3 can be 2.5 mm, 2.0 mm or 1.5 mm, etc. When h1 is 8 mm and h2 is 16 mm, h3 can be 10.0 mm, 12 mm or 16 mm, etc.

[0065] Continue to refer to Figure 6 and Figure 9 As shown in FIGS. and, on the side of the plastic part body 310 facing away from the battery cover plate 100, there are criss-cross reinforcing ribs 350, and the reinforcing ribs 350 are located in the circumferential direction of the cylinder body 321. Through the arrangement of the reinforcing ribs 350, the mechanical strength of the plastic part body 310 is improved, and the plastic part 300 is not easily bent or deformed. Along the first direction, the distance between the end face of the reinforcing rib 350 facing the side of the electrode group 400 and the end face of the plastic part body 310 facing the side of the electrode group 400 is h4, and h4 < h1. The height of the reinforcing rib 350 should not be set too high, otherwise it will not only waste materials but also easily interfere with other structural parts in the battery (such as pole ears, connecting pieces, etc.). Optionally, the value range of h4 is 0.4 mm ≤ h4 ≤ 5 mm. For example, when h1 is 0.8 mm, h4 can be 0.4 mm, 0.5 mm or 0.6 mm, etc. When h1 is 2 mm, h4 can be 0.4 mm, 0.8 mm or 1 mm, etc. When h1 is 8 mm, h4 can be 1 mm, 2 mm or 5 mm, etc.

[0066] The battery further includes a sealing component 140, and the sealing component 140 seals the first liquid injection hole 110. Exemplarily, the sealing component 140 includes a sealing nail 141 and a sealing cover 142. A counterbore 111 is provided on the side of the battery cover plate 100 facing away from the electrode group 400. The sealing nail 141 is pressed into the first liquid injection hole 110 and cooperates with the annular boss 120. The sealing cover 142 is embedded at the counterbore 111 and is welded to the side wall of the counterbore 111. Through the sealing nail 141 and the sealing cover 142, it is ensured that the first liquid injection hole 110 is sealed well and the sealing performance of the battery is good.

[0067] Continue to refer to Figure 1 and Figure 3, in the plastic part body 310 of this embodiment, it includes a first part 311 and a second part 312, and the second liquid injection hole 3111 and the diversion and support part 320 are arranged on the first part 311. Since the plastic part body 310 is relatively long in the second direction and the plastic part body 310 is usually integrally formed by injection molding, it is prone to bending deformation after injection molding and cooling, and the flatness of the plastic part body 310 cannot be guaranteed. Therefore, the plastic part body 310 is separately provided, which is beneficial to ensuring good flatness of the plastic part body 310 after injection molding, not being prone to bending and deformation after injection molding and cooling, having relatively high manufacturing precision, and fitting well with the battery cover plate 100.

[0068] Embodiment 2

[0069] This embodiment also provides a battery, and the difference from the battery in Embodiment 1 is that: in this embodiment, the first liquid injection hole 110 is arranged on the housing 200, the plastic part 300 is arranged on the side of the housing 200 facing the accommodation cavity, and the plastic part 300 is clamped between the housing 200 and the electrode group 400. The second liquid injection hole 3111 on the plastic part 300 is communicated with the first liquid injection hole 110 on the housing 200. The structure of the plastic part 300 is the same as that in Embodiment 1. By adopting the above-mentioned plastic part 300, its diversion and support part 320 can ensure the smooth progress of battery liquid injection or vacuum pumping, avoiding the situation that the second liquid injection hole 3111 and the second communication port 3212 are blocked by the insulating tape, which helps to quickly inject the electrolyte and quickly pump the vacuum, with relatively high efficiency.

[0070] The rest of the structures in this embodiment are the same as those in Embodiment 1 and will not be elaborated here one by one.

[0071] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery, characterized in that, Comprising: Battery cover plate; A housing, connected to the battery cover plate and enclosing to form a receiving cavity, and one of the battery cover plate and the housing is provided with a first liquid injection hole; A plastic part, disposed on one side of the battery cover plate or the housing close to the receiving cavity, the plastic part includes a plastic body and a diversion and support part, a second liquid injection hole communicating with the first liquid injection hole is provided on the plastic body, and the diversion and support part is located on the side of the plastic body close to the receiving cavity; The diversion and support part includes a cylinder body and a baffle plate assembly, one end of the cylinder body in the first direction is connected to the plastic body around the second liquid injection hole, the other end of the cylinder body in the first direction forms a first flow port, a second flow port penetrating through the cylinder body is provided on the circumferential direction of the cylinder body, both the first flow port and the second flow port communicate with the second liquid injection hole, and the baffle plate assembly is connected to the inner wall of the cylinder body.

2. The battery according to claim 1, wherein, The baffle plate assembly includes at least one first baffle plate and at least one second baffle plate, the first baffle plate and the second baffle plate are arranged at intervals and alternately in the first direction, and the length direction of the first baffle plate and the length direction of the second baffle plate are arranged at an angle.

3. The battery according to claim 2, characterized in that, Both the first baffle plate and the second baffle plate are parallel to the plastic body, and the length direction of the first baffle plate is perpendicular to the length direction of the second baffle plate.

4. The battery according to claim 1, characterized in that, A plurality of the second flow ports are provided, and the plurality of second flow ports are evenly spaced in the circumferential direction of the cylinder body, and the second flow ports are provided on the side of the baffle plate assembly close to the plastic body.

5. The battery according to claim 2, characterized in that, The first liquid injection hole and the second liquid injection hole are round holes, the diameter of the second liquid injection hole is φE, and the diameter of the first liquid injection hole is φD; the relationship between φE and φD satisfies: 1.2φD ≤ φE ≤ 1.5φD; The value range of φD is: 2mm ≤ φD ≤ 5mm.

6. The battery according to claim 5, characterized in that, The width of the first baffle plate is b, and the relationship between b and φD satisfies: 0.8φD ≤ b ≤ 1.1φD, and b < φE; The value range of b is: 1.6mm ≤ b ≤ 5.5mm.

7. The battery according to claim 1, characterized in that, In the first direction, the distance between the end face of the cylinder body close to the receiving cavity and the end face of the plastic body close to the receiving cavity is h1, and the value range of h1 is 2mm ≤ h1 ≤ 10mm.

8. The battery according to claim 7, wherein, The battery further includes a pole group, the pole group is disposed in the receiving cavity, a pressing part is provided on the side of the plastic body facing away from the battery cover plate or the housing, and the pressing part abuts against the pole group; In the first direction, the distance between the end face of the pressing part facing the pole group and the end face of the plastic body facing the pole group is h2, and h1 < h2; The value range of h2 is: 1.5mm ≤ h2 ≤ 16mm.

9. The battery according to claim 8, characterized in that, An exhaust part is provided on the side of the plastic body facing away from the battery cover plate or the housing, a plurality of air holes are provided on the exhaust part, a bursting hole is provided on the battery cover plate or the housing, an explosion-proof valve is provided in the bursting hole, and the air holes communicate the receiving cavity with the pressure relief channel after the explosion-proof valve is opened; Along the first direction, the distance between the end face of the exhaust part facing the pole group and the end face of the plastic part body facing the pole group is h3, where h1 < h3 ≤ h2; The value range of h3 is: 1.5 mm ≤ h3 ≤ 16 mm.

10. The battery according to claim 1, characterized in that, The plastic part body includes a first part and a second part, and the second liquid injection hole and the flow guiding and supporting part are arranged on the first part.

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