A battery

Abstract

The utility model belongs to battery technical field, specifically disclose a kind of battery, the battery includes battery cover, shell and plastic piece, one of shell and battery cover is equipped with first liquid injection hole, plastic piece includes plastic piece ontology and flow guide portion, and second liquid injection hole that is communicated with first liquid injection hole is equipped on plastic piece ontology, flow guide portion is connected in the plastic piece ontology of second liquid injection hole periphery, and flow guide portion is located at the side of plastic piece ontology close to pole group, and flow guide portion and plastic piece ontology form the circulation cavity between, and the periphery of flow guide portion is equipped with circulation port, and circulation port, circulation cavity and second liquid injection hole are sequentially communicated. Through the setting of flow guide portion, electrolyte can avoid direct impact pole group, and flow guide portion can support insulating tape, avoid insulating tape second liquid injection hole on plastic piece ontology is shielded, and electrolyte flows smoothly, and liquid injection efficiency, vacuumizing efficiency is higher.

Description

[0001] This application claims priority to patent application number 202520601000.0 (the earlier application was filed on April 1, 2025, and its title was: A Battery). Technical Field

[0002] This utility model relates to the field of battery technology, and in particular to a battery. Background Technology

[0003] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage. As an accessory of lithium-ion batteries, the battery cover assembly firstly seals the internal and external environments by welding it to the casing, and secondly connects the internal and external circuits, guiding the internal current of the battery to the outside through the terminals of the battery cover assembly. A traditional battery cover assembly generally includes a battery cover, terminals, an upper plastic component, and a lower plastic component. After the battery cover is welded to the casing, a closed space is formed between the battery cover and the casing. The electrode assembly is placed within this closed space, and the electrode assembly has tabs that are electrically connected to the terminals via connecting pieces.

[0004] Generally, the battery cover and lower plastic component have injection holes for injecting electrolyte into the casing. However, during injection, the electrolyte directly impacts the electrode assembly, potentially damaging it and affecting battery capacity. Furthermore, during injection, it's necessary to intermittently evacuate the casing through the injection holes to ensure smooth electrolyte injection and adequate volume. To optimize space utilization on the battery cover, the injection holes on the lower plastic component may be positioned above the connection area between the connecting piece and the electrode tab. This connection area is covered with insulating tape. When injecting electrolyte or evacuating, the insulating tape adheres to the electrode-facing side of the lower plastic component, clogging the injection holes, slowing the injection rate, and impacting production efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide a battery in which a flow guiding part is provided on the plastic part to prevent the electrolyte from directly impacting the electrode assembly. The flow guiding part can also support the insulating tape to prevent the insulating tape from blocking the second injection hole on the plastic part. The electrolyte flows smoothly and the injection efficiency and vacuuming efficiency are high.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a battery, comprising:

[0008] Battery cover;

[0009] The housing is connected to and encloses the battery cover to form a receiving cavity, and one of the battery cover and the housing is provided with a first liquid injection hole;

[0010] A plastic part is disposed on the side of the battery cover or the housing near the electrode assembly. The plastic part includes a plastic part body and a flow guide. The plastic part body is provided with a second liquid injection hole communicating with the first liquid injection hole. The flow guide is connected to the plastic part body circumferentially to the second liquid injection hole, and the flow guide is located on the side of the plastic part body near the electrode assembly. A flow cavity is formed between the flow guide and the plastic part body. A flow port is provided circumferentially to the flow guide. The flow port, the flow cavity and the second liquid injection hole are sequentially connected.

[0011] Wherein, along the first direction, the distance between the end face of the flow guide near the electrode group and the end face of the plastic body near the electrode group is h1;

[0012] The value of h1 is in the range of 2mm ≤ h1 ≤ 10mm.

[0013] Optionally, the flow guide includes a connecting plate and a baffle. One end of the connecting plate is connected to the plastic body circumferentially to the second injection hole, and the other end of the connecting plate is connected to the baffle. Along the first direction, the distance between the end face of the baffle near the electrode group and the end face of the plastic body near the electrode group is h1.

[0014] Optionally, the first injection hole and the second injection hole are round holes, and both the connecting plate and the baffle are provided. The connecting plate is an arc-shaped plate, and the baffle is a circular plate. The end of the arc-shaped plate away from the plastic part body is connected to the periphery of the circular plate, and the flow port is formed on the opposite side of the arc-shaped plate. A flow cavity is formed between the arc-shaped plate, the circular plate, and the plastic part body.

[0015] Optionally, the first injection hole and the second injection hole are round holes. There are two connecting plates. The ends of the two connecting plates away from the plastic body are respectively connected to the ends of the baffle in the length direction. The connecting plate is an arc-shaped plate. The baffle is a long strip plate with arc-shaped edges at both ends in the length direction. The two sides of the long strip plate in the width direction, together with the arc-shaped plate and the plastic body, form the flow port. A flow cavity is formed between the arc-shaped plate, the long strip plate and the plastic body.

[0016] Optionally, the flow guide further includes two auxiliary baffles, which are located on both sides of the width of the elongated plate, and the ends of the auxiliary baffles in the length direction are connected to the arc-shaped plate; along the first direction, the distance between the end face of the auxiliary baffle near the electrode group and the end face of the plastic body near the electrode group is h3, h3 < h1; each auxiliary baffle divides its corresponding flow port into a first flow area and a second flow area.

[0017] Optionally, the diameter of the second injection hole is φE, and the diameter of the first injection hole is φD;

[0018] The relationship between φE and φD satisfies: 1.2φD≤φE≤1.5φD;

[0019] The range of φD is: 2mm≤φD≤5mm.

[0020] Optionally, the plastic part includes an exhaust portion connected to the body of the plastic part and disposed on the side of the plastic part body near the electrode assembly. The exhaust portion is used to connect the spaces on both sides of the plastic part body along a first direction. The plastic part also includes a support portion connected to the end of the plastic part body along a second direction. The support portion is disposed on the side of the plastic part body near the electrode assembly and abuts against the electrode assembly. The height of the support portion along the first direction is not less than the height of the exhaust portion along the first direction.

[0021] Along the first direction, the height by which the end face of the exhaust section near the electrode group protrudes from the end face of the baffle near the electrode group is h2; the value of h2 is in the range of 0.5mm≤h2≤3mm.

[0022] Optionally, the first injection hole is provided with a guide flange in the circumferential direction, and one end of the guide flange near the electrode assembly extends into the second injection hole.

[0023] Optionally, an annular groove is provided on the end face of the battery cover or the housing facing the electrode group on the circumferential direction of the guide flange, and an annular flange is provided on the end face of the plastic body facing away from the electrode group. The annular flange extends into the annular groove and is inserted into the annular groove.

[0024] Optionally, the battery includes a sealing assembly for sealing the first injection hole.

[0025] The beneficial effects of this utility model are as follows:

[0026] This utility model provides a battery, including a battery cover, a housing, and a plastic part. One of the housing and the battery cover has a first electrolyte injection hole. The plastic part includes a plastic part body and a flow guide. The plastic part body has a second electrolyte injection hole communicating with the first electrolyte injection hole. The flow guide is connected to the plastic part body circumferentially around the second electrolyte injection hole, and the flow guide is located on the side of the plastic part body closer to the electrode assembly. A flow cavity is formed between the flow guide and the plastic part body. The flow guide has a flow outlet circumferentially around its circumference. The flow outlet, the flow cavity, and the second electrolyte injection hole are sequentially connected. The flow guide prevents the electrolyte from directly impacting the electrode assembly, and it supports the insulating tape, preventing the insulating tape from blocking the second electrolyte injection hole on the plastic part body. This ensures smooth electrolyte flow and high electrolyte injection and vacuuming efficiency. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0028] Figure 1 This is a structural schematic diagram of the battery cover and plastic part provided in Embodiment 1 of this utility model;

[0029] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0030] Figure 3 This is a top view of the battery provided in Embodiment 1 of this utility model;

[0031] Figure 4 for Figure 3 Cross-sectional view of section BB in the middle;

[0032] Figure 5 for Figure 4 A magnified view of a section at point C;

[0033] Figure 6 This is a partially enlarged view of the battery cover and plastic parts assembled according to Embodiment 1 of this utility model;

[0034] Figure 7 This is a schematic diagram of the structure of the battery cover and plastic part provided in Embodiment 2 of this utility model;

[0035] Figure 8 for Figure 7 A magnified view of a section at point D;

[0036] Figure 9This is a bottom view of the battery cover and plastic part provided in Embodiment 2 of this utility model;

[0037] Figure 10 for Figure 9 A magnified view of a section at point E in the middle;

[0038] Figure 11 for Figure 9 Schematic diagram of the cross-sectional structure of section FF;

[0039] Figure 12 for Figure 11 A magnified view of a section at point G in the middle;

[0040] Figure 13 This is a top view of the battery provided in Embodiment 2 of this utility model;

[0041] Figure 14 for Figure 13 A sectional view of section HH in the middle;

[0042] Figure 15 for Figure 14 A magnified view of a section at point J;

[0043] Figure 16 This is an exploded view of the battery provided in Embodiment 2 of this utility model.

[0044] In the picture:

[0045] 100. Battery cover; 110. First injection hole; 120. Guide flange; 1201. First transition surface; 130. Settlement platform; 150. Explosion-proof valve; 160. Annular groove; 200. Plastic part; 210. Plastic part body; 211. Second injection hole; 2101. Second transition surface; 212. Vent hole; 220. Flow guide; 2201. Flow port; 2201a. First flow area; 2201b. Second flow area; 221. Connecting plate; 222. Baffle; 223. Auxiliary baffle; 230. Exhaust part; 231. Exhaust hole; 240. Support part; 250. Reinforcing rib; 300. Electrode assembly; 310. Electrode tab; 400. Sealing assembly; 410. Sealing pin; 420. Sealing cap; 500. Housing; 600. Connecting piece; 700. Terminal post. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0047] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0050] Example 1

[0051] like Figures 1-4 As shown, this embodiment provides a battery, which includes a battery cover 100, a housing 500, an electrode assembly 300, and a plastic part 200. The battery cover 100 and the housing 500 together form a receiving cavity for installing the electrode assembly 300 and the plastic part 200. The battery cover 100 is provided with a first liquid injection hole 110, and the plastic part 200 is disposed on the side of the battery cover 100 near the electrode assembly 300.

[0052] The plastic part 200 includes a plastic part body 210 and a flow guide 220. The plastic part body 210 has a second injection hole 211 communicating with the first injection hole 110. The flow guide 220 is connected to the plastic part body 210 circumferentially around the second injection hole 211. The flow guide 220 is located on the side of the plastic part body 210 near the electrode assembly 300. A flow cavity is formed between the flow guide 220 and the plastic part body 210. The flow guide 220 has a flow port 2201 circumferentially. The opening direction of the flow port 2201 is parallel to the end face of the plastic part body 210, that is, the opening direction of the flow port 2201 is parallel to the end face of the plastic part body 210. Figure 1 The X-axis shown is parallel, and the flow port 2201, the flow cavity, and the second injection hole 211 are sequentially connected. The guide portion 220 guides the flow of the electrolyte, preventing it from directly impacting the electrode assembly 300 and providing good protection. Furthermore, the guide portion 220 creates a flow space between the plastic part 200 and the electrode assembly 300. Even if the insulating tape covering the tabs 310 of the electrode assembly 300 is in contact with the end face of the guide portion 220 near the electrode assembly 300, the electrolyte can still enter the receiving cavity through the circumferential flow port 2201 of the guide portion 220. This prevents the insulating tape from blocking the second injection hole 211, allowing the electrolyte to flow smoothly within the first injection hole 110 and the second injection hole 211, resulting in high injection efficiency and easy vacuuming.

[0053] See also Figure 4 , Figure 5 and Figure 6 Along the first direction, the distance between the end face of the guide portion 220 near the electrode assembly 300 and the end face of the plastic body 210 near the electrode assembly 300 is h1, and the first direction is... Figure 4 The Z-axis direction is shown in the figure. The value range of h1 is 2mm ≤ h1 ≤ 10mm. For example, the value of h1 can be 2.0mm, 2.5mm, 3.0mm, 4.0mm, 5.0mm, or 10.0mm, etc. Through the above settings, the flow guide 220 can provide good support for the insulating tape. When the battery is vacuumed, the insulating tape will not block the first injection hole 110 and the second injection hole 211. The electrolyte can be injected into the battery casing 500 from the first injection hole 110, the second injection hole 211, and the flow port 2201, and the electrolyte injection is smooth. In addition, the volume of the flow cavity is large to meet the need for rapid electrolyte flow. Otherwise, if the value of h1 is too small, the distance between the plastic body 210 and the insulating tape will be too close, resulting in poor support of the insulating tape by the flow guide 220. During vacuuming, the insulating tape may wrap around the flow guide 220 and block the flow port 2201 and the second electrolyte injection hole 211, hindering electrolyte flow and potentially causing leakage. Of course, the value of h1 should not be too large either, otherwise the distance between the plastic body 210 and the electrode assembly 300 will need to be increased, wasting space and hindering the improvement of battery energy density.

[0054] See also Figure 2 , Figure 4 and Figure 6 The flow guide 220 includes a connecting plate 221 and a baffle 222. One end of the connecting plate 221 is connected to the plastic body 210 circumferentially to the second injection hole 211, and the other end of the connecting plate 221 is connected to the baffle 222. The distance between the end face of the baffle 222 near the electrode group 300 and the end face of the plastic body 210 near the electrode group 300 is h1.

[0055] Optionally, the first injection hole 110 and the second injection hole 211 are circular holes, the connecting plate 221 is an arc-shaped plate, and the baffle 222 is a circular plate, with the arc-shaped plate along the second direction ( Figure 2 A flow port 2201 is formed on the opposite side of the X-axis direction shown in the figure, and a flow cavity is formed between the arc-shaped plate, the circular plate, and the plastic body 210. The diameter of the second injection hole 211 is φE, and the diameter of the first injection hole 110 is φD. The relationship between φE and φD satisfies: 1.2φD≤φE≤1.5φD. The value range of φD is: 2mm≤φD≤5mm. For example, the value of φD can be 2mm, 3mm, 4mm, or 5mm. By controlling the diameter φD of the first injection hole 110 within the above range, it can be ensured that the flow area of ​​the first injection hole 110 is large enough to meet the requirements of injection and vacuuming. When the value of φD is 2mm, the diameter φE of the second injection hole 211 can be 2.4mm, 2.6mm, 2.8mm, or 3.0mm, etc. When the value of φD is 5mm, the diameter φE of the second injection hole 211 can be 6.0mm, 6.5mm, 7.0mm or 7.5mm, etc.

[0056] Optionally, in this embodiment, the first injection hole 110 is provided with a guide flange 120 in the circumferential direction. The end of the guide flange 120 near the electrode assembly 300 extends into the second injection hole 211. The guide flange 120 is inverted conical in shape, with its small end facing the electrode assembly 300. The inverted conical guide flange 120 has a certain guiding function, which facilitates the insertion of the guide flange 120 into the second injection hole 211.

[0057] Furthermore, the guide flange 120 is connected to the end face of the battery cover 100 near the electrode assembly 300 via a first transition surface 1201. The first transition surface 1201 faces away from the first injection hole 110. The inner wall of the second injection hole 211 is connected to the end face of the plastic body 210 facing away from the electrode assembly 300 via a second transition surface 2101. The second transition surface 2101 and the first transition surface 1201 cooperate to guide each other, thereby ensuring accurate positioning and high assembly precision between the battery cover 100 and the plastic part 200. Along the second direction, there is a gap e between the first transition surface 1201 and the second transition surface 2101, where e is greater than or equal to 0.3 mm. For example, the value of e can be 0.3 mm, 0.5 mm, 0.8 mm, or 1.0 mm, etc. By setting a gap between the second transition surface 2101 and the first transition surface 1201, it is convenient for the two to assemble, avoids interference, and provides good guidance.

[0058] See also Figure 2 and Figure 6 The connecting plate 221 is symmetrically arranged about the central axis of the plastic body 210 along the second direction. Both ends of the connecting plate 221 are bent towards the direction of the second injection hole 211. Along the second direction, the distance F between the end of the baffle 222 facing away from the connecting plate 221 and the sidewall of the connecting plate 221 facing the flow port 2201 is also called the distance. That is, the width F of the flow port 2201 formed by the connecting plate 221 and the baffle 222 along the second direction is also called the distance. F satisfies the condition 0.25φE≤F≤0.75φE. When the value of φE is 3.0mm, the value of F can be 0.75mm, 1.5mm, or 2.25mm, etc. When the value of φE is 6.0mm, the value of F can be 1.5mm, 3.0mm, or 4.5mm, etc. By limiting the value of F within the above range, on the one hand, the flow area of ​​the flow port 2201 is large enough to ensure smooth flow of electrolyte, and on the other hand, the mechanical strength of the arc plate is large enough to allow the baffle 222 to withstand large impact forces without damage, thus ensuring high reliability.

[0059] See also Figure 1 , Figure 4 and Figure 5The plastic part 200 includes a venting section 230, which is connected to the plastic part body 210 and is located on the side of the plastic part body 210 near the electrode assembly 300. The venting section 230 is used to connect the spaces on both sides of the plastic part body 210 along a first direction. An explosion-proof valve 150 is provided on the battery cover 100. Along the first direction, the projection of the explosion-proof valve 150 on the battery cover 100 coincides with the projection of the venting section 230 on the battery cover 100. The venting section 230 has several vent holes 231, which connect the accommodating cavity to the explosion-proof valve 150. This allows high-temperature, high-pressure gas to act on the explosion-proof valve 150 during battery thermal runaway, causing it to open and release pressure, thereby ensuring battery safety and avoiding the risk of explosion.

[0060] Optionally, along the first direction, the height by which the end face of the exhaust section 230 near the electrode assembly 300 protrudes beyond the end face of the baffle 222 near the electrode assembly 300 is h2, and the value of h2 is in the range of 0.5mm ≤ h2 ≤ 3mm. For example, the value of h2 can be 0.5mm, 1.5mm, 2.5mm, or 3.0mm, etc. By keeping the value of h2 within the above range, interference between the guide section 220 and the electrode assembly 300 can be avoided, ensuring that the electrode assembly 300 remains intact.

[0061] Furthermore, the plastic part 200 includes two support portions 240, each connected to one end of the plastic part body 210 along a second direction. The support portions 240 are located on the side of the plastic part body 210 near the electrode assembly 300 and abut against the electrode assembly 300. The height of the support portions 240 along the first direction is not less than the height of the vent portion 230 along the first direction. Thus, the support portions 240 press the electrode assembly 300 firmly within the housing 500, preventing the electrode assembly 300 from shaking and pulling on the electrode tabs 310.

[0062] Optionally, a reinforcing rib 250 is provided on the end face of the plastic body 210 facing the electrode assembly 300. The reinforcing rib 250 is located circumferentially in the guide portion 220, and the height of the reinforcing rib 250 along the first direction is less than the height of the guide portion 220 along the first direction. By providing the reinforcing rib 250, the mechanical strength of the plastic body 210 is improved, and the plastic body 200 is less prone to bending and deformation.

[0063] The battery includes a sealing assembly 400 for sealing the first electrolyte filling hole 110. Exemplarily, the sealing assembly 400 includes a sealing pin 410 and a sealing cap 420. A countersunk platform 130 is provided on the side of the battery cover plate 100 opposite to the electrode assembly 300. The sealing pin 410 is pressed into the first electrolyte filling hole 110 and engages with a guide flange 120. The sealing cap 420 is embedded in the countersunk platform 130 and welded to the side wall of the countersunk platform 130. The sealing pin 410 and the sealing cap 420 ensure a good seal for the first electrolyte filling hole 110, resulting in good battery sealing performance.

[0064] Example 2

[0065] like Figures 7-12 As shown, this embodiment provides a battery that differs from the battery in Embodiment 1 in that the structure design of the flow guide 220 on the plastic part 200 is different. The flow guide 220 can also guide the flow of electrolyte and prevent the electrolyte from directly impacting the electrode assembly 300, thus providing good protection for the electrode assembly 300.

[0066] Specifically, the battery in this embodiment includes a battery cover plate 100, a housing 500, and a plastic part 200. The housing 500 is connected to the battery cover plate 100 and forms a receiving cavity. The battery cover plate 100 is provided with a first liquid injection hole 110. The plastic part 200 is disposed on the side of the battery cover plate 100 near the electrode assembly 300. The plastic part 200 includes a plastic part body 210 and a flow guide 220. The plastic part body 210 is provided with a second liquid injection hole 211 communicating with the first liquid injection hole 110. The flow guide 220 is connected to the plastic part body 210 circumferentially around the second liquid injection hole 211, and the flow guide 220 is located on the side of the plastic part body 210 near the electrode assembly 300. A flow cavity is formed between the flow guide 220 and the plastic part body 210. A flow port 2201 is provided circumferentially around the flow guide 220. The flow port 2201, the flow cavity, and the second liquid injection hole 211 are sequentially connected.

[0067] The flow guide 220 includes two connecting plates 221 and a baffle 222. One end of the two connecting plates 221 is connected to the plastic body 210 circumferentially to the second injection hole 211, and the ends of the two connecting plates 221 away from the plastic body 210 are respectively connected to the baffle 222 along its length. Figure 7 The end of the X-axis direction (i.e., the second direction) shown. The first injection hole 110 and the second injection hole 211 are round holes, the connecting plate 221 is an arc-shaped plate, and the baffle 222 is a long strip plate with arc-shaped edges at both ends in the length direction, and the width direction of the long strip plate ( Figure 7 As shown in the Y-axis direction (i.e., the third direction), the two sides of the curved plate and the plastic body 210 form a flow port 2201, and a flow cavity is formed between the curved plate, the elongated plate and the plastic body 210. Thus, the arrangement of the guide part 220 allows for a flow space between the plastic body 200 and the electrode assembly 300. Even if the insulating tape covering the electrode tabs 310 of the electrode assembly 300 is in contact with the end face of the guide part 220 near the electrode assembly 300 (i.e., the baffle 222), the electrolyte can still enter the receiving cavity through the flow ports 2201 on both sides of the width direction of the baffle 222 (elongated plate), avoiding the situation where the insulating tape blocks the second injection hole 211. The electrolyte can flow smoothly in the first injection hole 110 and the second injection hole 211, resulting in high injection efficiency and easy vacuuming.

[0068] See also Figures 13-15Along the first direction ( Figure 7 The distance between the end face of the baffle 222 near the pole group 300 and the end face of the plastic body 210 near the pole group 300 (shown in the Z-axis direction) is h1. The first direction is... Figure 14 The Z-axis direction is shown in the figure. The value range of h1 is 2mm ≤ h1 ≤ 10mm. For example, the value of h1 can be 2.0mm, 2.5mm, 3.0mm, 4.0mm, 5.0mm, or 10.0mm, etc. Through the above settings, the flow guide 220 can provide good support for the insulating tape. When the battery is vacuumed, the insulating tape will not block the first injection hole 110 and the second injection hole 211. The electrolyte can be injected into the battery casing 500 from the first injection hole 110, the second injection hole 211, and the flow port 2201, and the electrolyte injection is smooth. In addition, the volume of the flow cavity is large to meet the need for rapid electrolyte flow. Further, the diameter of the second injection hole 211 is φE, and the diameter of the first injection hole 110 is φD. The relationship between φE and φD satisfies: 1.2φD ≤ φE ≤ 1.5φD. The value range of φD is: 2mm ≤ φD ≤ 5mm. For example, the value of φD can be 2mm, 3mm, 4mm, or 5mm. By controlling the diameter φD of the first injection hole 110 within the above range, it can be ensured that the flow area of ​​the first injection hole 110 is large enough to meet the requirements of injection and vacuuming. When the value of φD is 2mm, φE can be 2.4mm, 2.6mm, 2.8mm, or 3.0mm, etc. When the value of φD is 5mm, φE can be 6.0mm, 6.5mm, 7.0mm, or 7.5mm, etc.

[0069] See also Figure 8 , Figure 10 and Figure 12 In this embodiment, the flow guide 220 further includes two auxiliary baffles 223. The two auxiliary baffles 223 are located on both sides of the baffle 222 (i.e., the elongated plate) in the width direction, and the ends of the auxiliary baffles 223 in the length direction are connected to the connecting plate 221 (i.e., the arc-shaped plate). Optionally, the two auxiliary baffles 223 are symmetrically arranged about the central axis of the baffle 222 in the length direction. Along the first direction, the projection of the baffle 222 and the two auxiliary baffles 223 on the plastic body 210 can almost completely cover the second injection hole 211, thus better preventing the electrolyte from directly impacting the electrode assembly 300, and playing a good guiding and buffering role for the electrolyte.

[0070] Optionally, the length of the baffle 222 along the second direction is F1, and the relationship between F1 and φE satisfies: 4mm≤F1-φE≤15mm. The width of the baffle 222 along the third direction is W1, W1>φD, and 0.2≤W1 / F1≤0.8. This ensures that the projection of the baffle 222 along the first direction onto the plastic body 210 completely covers the first injection hole 110, effectively blocking the flow of electrolyte. The electrolyte enters the housing 500 from the flow ports 2201 on both sides of the width direction of the baffle 222, preventing the electrolyte from directly impacting the electrode assembly 300 and providing good protection for the electrode assembly 300.

[0071] Furthermore, the width of the auxiliary baffle 223 along the third direction is W2, and the distance between the side of the auxiliary baffle 223 away from the baffle 222 and the edge of the second injection hole 211 along the third direction is W3. The value of W2 ranges from 0.5mm to 3.0mm, and the value of W3 ranges from 0.2mm to 2.0mm. By adopting the above configuration, on the one hand, the auxiliary baffle 223 has sufficient mechanical strength, and on the other hand, the electrolyte can flow smoothly and at a relatively fast rate.

[0072] Optionally, along the third direction, the distance between the sides of the baffle 222 and the auxiliary baffle 223 that are close to each other is b, and the value of b is in the range of 0mm ≤ b ≤ 0.5mm. For example, the value of b can be 0mm, 0.3mm, or 0.5mm. When the value of b is 0mm, there is no gap between the sides of the baffle 222 and the auxiliary baffle 223 that are close to each other along the third direction, which has a better effect on the flow obstruction of electrolyte, but requires higher processing precision and is not easy to form. When the value of b is in the range of 0mm < b ≤ 0.5mm, the effect on the flow obstruction of electrolyte is also good, and the processing precision requirement is low, it is easy to form, and the processing yield is high. Further, the relationship between b, W1, W2 and φE satisfies: W1 + 2W2 + 2b < φE. By adopting the above settings, the projections of the auxiliary baffle 223 and baffle 222 on the plastic body 210 along the first direction will not completely block the second injection hole 211, which is conducive to accelerating the flow of electrolyte and ensuring smooth electrolyte injection.

[0073] See also Figure 15Along the first direction, the distance between the end face of the auxiliary baffle 223 near the electrode assembly 300 and the end face of the plastic body 210 near the electrode assembly 300 is h3, where h3 < h1. For example, the value of h3 is in the range of 0.6mm ≤ h3 ≤ 3.0mm. For example, the value of h3 can be 0.6mm, 1.0mm, 2.0mm, 2.5mm, or 3.0mm, etc. Through the above arrangement, each auxiliary baffle 223 can divide its corresponding flow port 2201 into a first flow area 2201a and a second flow area 2201b. During the vacuuming operation of the battery, even if the first flow area 2201a of the flow port 2201 is blocked, the electrolyte can still be injected into the battery casing 500 from the first injection hole 110, the second injection hole 211, and the second flow area 2201b of the flow port 2201. This prevents the flow port 2201 from being completely blocked, ensuring that the electrolyte can be smoothly injected into the casing 500. Furthermore, the auxiliary baffle 223 increases the volume of the flow cavity, which is beneficial for the rapid flow of the electrolyte.

[0074] Optionally, see [link to relevant documentation] Figure 15 The thickness of the baffle 222 along the first direction is t1, the thickness of the auxiliary baffle 223 along the first direction is t2, and the thickness of the connecting plate 221 along the second direction is t3. The values ​​of t1, t2, and t3 are all within the range of 0.3mm-1.0mm. This ensures that the baffle 222, the auxiliary baffle 223, and the connecting plate 221 themselves have high mechanical strength, and the overall structural strength of the guide section 220 is high, making it less prone to deformation and highly reliable.

[0075] Furthermore, an exhaust vent 230 is provided on the side of the plastic body 210 near the electrode assembly 300. The exhaust vent 230 is used to connect the spaces on both sides of the plastic body 210 along the first direction. An explosion-proof valve 150 is provided on the battery cover 100. Along the first direction, the projection of the explosion-proof valve 150 on the battery cover 100 at least partially overlaps with the projection of the exhaust vent 230 on the battery cover 100. The exhaust vent 230 is provided with a plurality of exhaust holes 231, which connect the accommodating cavity and the explosion-proof valve 150. This allows high-temperature and high-pressure gas to act on the explosion-proof valve 150 in the event of battery thermal runaway, causing it to open and release pressure, thereby ensuring battery safety and avoiding the risk of explosion. In some embodiments, the plastic body 210 may also be provided with a plurality of vent holes 212. Along the first direction, the projection of the explosion-proof valve 150 on the battery cover 100 and the projection of the vent 212 on the battery cover 100 at least partially overlap. The vent 212 can also connect the accommodating cavity with the explosion-proof valve 150. The setting of the vent 212 can accelerate the gas flow, which is conducive to the explosion-proof valve 150 responding quickly and opening the valve in time.

[0076] Along the first direction, the end face of the exhaust section 230 near the electrode assembly 300 protrudes by a height h2 from the end face of the baffle 222 near the electrode assembly 300. The value of h2 is in the range of 0.5mm ≤ h2 ≤ 3mm. For example, the value of h2 can be 0.5mm, 1.5mm, 2.5mm, or 3.0mm, etc. By keeping the value of h2 within the above range, interference between the flow guide section 220 and the electrode assembly 300 can be avoided, preventing the electrode assembly 300 from being damaged. At the same time, it can also ensure that there is a large flow space between the flow guide section 220 and the electrode assembly 300, which facilitates the rapid flow of electrolyte.

[0077] Furthermore, a guide flange 120 is provided circumferentially for the first injection hole 110, and the end of the guide flange 120 near the electrode assembly 300 extends into the second injection hole 211. An annular groove 160 is provided on the end face of the battery cover 100 facing the electrode assembly 300, located circumferentially to the guide flange 120. An annular flange (not shown in the figure) is provided on the end face of the plastic part body 210 facing away from the electrode assembly 300. The annular flange extends into the annular groove 160 and engages with it. The engagement of the annular groove 160 and the annular flange improves the positioning accuracy during assembly of the plastic part 200 and the battery cover 100, ensures the coaxiality of the first injection hole 110 and the second injection hole 211, achieves higher assembly accuracy, and provides better electrolyte flow guidance from the guide portion 220.

[0078] See Figure 7 , Figure 14 and Figure 16 The plastic part 200 also includes two support portions 240, which are respectively connected to one end of the plastic part body 210 along a second direction. The support portions 240 are located on the side of the plastic part body 210 near the electrode assembly 300 and abut against the electrode assembly 300. The height of the support portions 240 along the first direction is not less than the height of the vent portion 230 along the first direction. Thus, the support portions 240 press the electrode assembly 300 tightly into the housing 500, preventing the electrode assembly 300 from shaking and pulling the tabs 310. The tabs 310 of the electrode assembly 300 are electrically connected to the terminal posts 700 integrated on the battery cover plate 100 through the connecting piece 600, realizing the conduction of the internal circuit of the battery.

[0079] The battery in this embodiment also includes a sealing assembly 400, which is used to seal the first liquid injection hole 110. Exemplarily, the sealing assembly 400 includes a sealing pin 410 and a sealing cap 420. A recessed platform 130 is provided on the side of the battery cover plate 100 opposite to the electrode assembly 300. The sealing pin 410 is pressed into the first liquid injection hole 110 and engages with the guide flange 120. The sealing cap 420 is embedded in the recessed platform 130 and welded to the side wall of the recessed platform 130. The sealing pin 410 and the sealing cap 420 ensure that the first liquid injection hole 110 is well sealed, resulting in good battery sealing performance.

[0080] Example 3

[0081] This embodiment also provides a battery, which differs from the battery in Embodiment 1 in that: in this embodiment, the first injection hole 110 is disposed on the housing 500, and the plastic part 200 is disposed on the side of the housing 500 facing the receiving cavity. The plastic part 200 is sandwiched between the housing 500 and the electrode assembly 300, and the second injection hole 211 on the plastic part 200 communicates with the first injection hole 110 on the housing 500. The structure of the plastic part 200 is the same as in Embodiment 1. By using the above-mentioned plastic part 200, its guiding part 220 can prevent the electrolyte from directly impacting the electrode assembly 300, and can ensure that the battery injection or vacuuming is carried out smoothly. It avoids the situation where the insulating tape blocks the second injection hole 211 and the first injection hole 110, which helps to quickly inject electrolyte and quickly vacuum, resulting in higher efficiency.

[0082] The remaining structures in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0083] Example 4

[0084] This embodiment also provides a battery, which differs from the battery in Embodiment 2 in that: in this embodiment, the first injection hole 110 is disposed on the housing 500, and the plastic part 200 is disposed on the side of the housing 500 facing the receiving cavity. The plastic part 200 is sandwiched between the housing 500 and the electrode assembly 300, and the second injection hole 211 on the plastic part 200 communicates with the first injection hole 110 on the housing 500. The structure of the plastic part 200 is the same as in Embodiment 1. By using the above-mentioned plastic part 200, its guiding part 220 can prevent the electrolyte from directly impacting the electrode assembly 300, and can ensure that the battery injection or vacuuming is carried out smoothly. It avoids the situation where the insulating tape blocks the second injection hole 211 and the first injection hole 110, which helps to quickly inject electrolyte and quickly vacuum, resulting in higher efficiency.

[0085] The remaining structures in this embodiment are the same as those in Embodiment 2, and will not be described in detail here.

[0086] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery, characterized by, include: Battery cover; The housing is connected to and encloses the battery cover to form a receiving cavity, and one of the battery cover and the housing is provided with a first liquid injection hole; A plastic part is disposed on the side of the battery cover or the housing near the electrode assembly. The plastic part includes a plastic part body and a flow guide. The plastic part body is provided with a second liquid injection hole communicating with the first liquid injection hole. The flow guide is connected to the plastic part body circumferentially to the second liquid injection hole, and the flow guide is located on the side of the plastic part body near the electrode assembly. A flow cavity is formed between the flow guide and the plastic part body. A flow port is provided circumferentially to the flow guide. The flow port, the flow cavity and the second liquid injection hole are sequentially connected. Wherein, along the first direction, the distance between the end face of the flow guide near the electrode group and the end face of the plastic body near the electrode group is h1; The value of h1 is in the range of 2mm ≤ h1 ≤ 10mm.

2. The battery according to claim 1, characterized in that, The flow guide includes a connecting plate and a baffle. One end of the connecting plate is connected to the plastic body circumferentially to the second injection hole, and the other end of the connecting plate is connected to the baffle. Along the first direction, the distance between the end face of the baffle near the electrode group and the end face of the plastic body near the electrode group is h1.

3. The battery according to claim 2, characterized in that, The first injection hole and the second injection hole are round holes. The connecting plate and the baffle are both provided. The connecting plate is an arc-shaped plate and the baffle is a circular plate. The end of the arc-shaped plate away from the plastic part body is connected to the periphery of the circular plate. The flow port is formed on the opposite side of the arc-shaped plate. A flow cavity is formed between the arc-shaped plate, the circular plate and the plastic part body.

4. The battery according to claim 2, characterized in that, The first injection hole and the second injection hole are round holes. There are two connecting plates. The ends of the two connecting plates away from the plastic body are respectively connected to the ends of the baffle in the length direction. The connecting plate is an arc-shaped plate. The baffle is a long strip plate with arc-shaped edges at both ends in the length direction. The two sides of the long strip plate in the width direction, together with the arc-shaped plate and the plastic body, form the flow port. A flow cavity is formed between the arc-shaped plate, the long strip plate and the plastic body.

5. The battery according to claim 4, characterized in that, The flow guide also includes two auxiliary baffles, which are located on both sides of the width of the elongated plate, and the ends of the auxiliary baffles in the length direction are connected to the arc-shaped plate. Along the first direction, the distance between the end face of the auxiliary baffle near the electrode group and the end face of the plastic body near the electrode group is h3, h3 < h1; each auxiliary baffle divides its corresponding flow port into a first flow area and a second flow area.

6. The battery according to any one of claims 3-5, characterized in that, The diameter of the second injection hole is φE, and the diameter of the first injection hole is φD; The relationship between φE and φD satisfies: 1.2φD≤φE≤1.5φD; The range of φD is: 2mm≤φD≤5mm.

7. The battery according to claim 2, characterized in that, The plastic part includes an exhaust portion connected to the body of the plastic part and disposed on the side of the plastic part body near the electrode assembly. The exhaust portion is used to connect the spaces on both sides of the plastic part body along a first direction. The plastic part also includes a support portion connected to the end of the plastic part body along a second direction. The support portion is disposed on the side of the plastic part body near the electrode assembly and abuts against the electrode assembly. The height of the support portion along the first direction is not less than the height of the exhaust portion along the first direction. Along the first direction, the height h2 of the end face of the exhaust section near the electrode group protrudes from the end face of the baffle near the electrode group. The value of h2 is in the range of 0.5mm≤h2≤3mm.

8. The battery according to claim 1, characterized in that, The first injection hole is provided with a guide flange in the circumferential direction, and one end of the guide flange near the electrode assembly extends into the second injection hole.

9. The battery according to claim 8, characterized in that, An annular groove is provided on the end face of the battery cover or the housing facing the electrode group on the circumferential direction of the guide flange, and an annular flange is provided on the end face of the plastic body facing away from the electrode group. The annular flange extends into the annular groove and is inserted into the annular groove.

10. The battery according to claim 1, characterized in that, The battery includes a sealing assembly for sealing the first injection hole.

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