Cover plate assembly, battery shell, battery and electric equipment

Abstract

The embodiment of the invention provides a cover plate assembly, a battery shell, a battery and electric equipment. Relates to the technical field of batteries. The cover plate assembly comprises a cover plate, a pole, a space ring, an insulating ring, a transition ring and a sealing piece. The cover plate has a through hole; part of the poles penetrate through the through holes; the space ring surrounds the periphery of the pole; the insulating ring surrounds the periphery of the post terminal and is arranged at an interval with the space ring along the extension direction of the post terminal; the sealing element surrounds the periphery of the pole; the two sides of the sealing element are respectively propped against the space ring and the insulating ring in a sealing manner along the extension direction of the pole; and the transition ring surrounds one side, deviating from the pole, of the sealing element and is positioned between the space ring and the insulating ring. Under the condition that the pole is electrified, the pole and the transition ring are physically isolated by the sealing element, so that electric conduction between the pole and the transition ring can be effectively prevented, the cover plate and the battery shell are prevented from being electrified, and the safety of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cover plate assembly, a battery housing, a battery and an electrical device. Background Art

[0002] The performance of the battery directly affects key indicators of electrical equipment such as electric vehicles, such as range, acceleration performance and charging time.

[0003] In the related art, the battery includes a shell, a battery cell, a pole and a cover assembly. The shell is used to protect the battery cell and prevent it from physical damage and leakage. The battery cell is responsible for storing and releasing electrical energy. The battery cell includes a positive electrode, a negative electrode, a separator and an electrolyte. The electrolyte allows ions to move between the positive electrode and the negative electrode, thereby completing an electrochemical reaction. The cover assembly is used to seal the shell with an opening. The current generated by the electrochemical reaction inside the battery cell is conducted to the pole, which leads the current out of the battery and connects to the external circuit.

[0004] However, the existing cover plate assembly has the problem that the pole and the cover plate assembly are electrically conductive, and the cover plate assembly and the housing are charged. Summary of the invention

[0005] The embodiments of the present application provide a cover plate assembly, a battery housing, a battery and an electrical device, which avoid electrical conduction between the cover plate assembly and the pole, avoid the cover plate assembly and the battery housing being charged, and improve the safety of the electrical device.

[0006] In a first aspect, an embodiment of the present application provides a cover plate assembly. The cover plate assembly is used for a battery. The cover plate assembly includes:

[0007] a cover plate having a through hole;

[0008] Pole, some poles are provided with through holes;

[0009] Spacer ring, surrounding the outer circumference of the pole;

[0010] The insulating ring surrounds the outer circumference of the pole and is arranged along the extension direction of the pole and at intervals of the spacer ring;

[0011] The sealing member surrounds the outer circumference of the pole; along the extension direction of the pole, two sides of the sealing member are respectively sealed against the spacer ring and the insulating ring;

[0012] The transition ring surrounds the side of the seal facing away from the pole and is located between the spacer and the insulating ring.

[0013] In some embodiments of the present application, there is a first gap between the sealing member and the pole.

[0014] In some embodiments of the present application, a second gap is formed between the sealing element and the transition ring.

[0015] In some embodiments of the present application, the transition ring is connected to the cover plate.

[0016] In some embodiments of the present application, when there is a first gap between the seal and the pole, the seal is annular, and the first gap is formed between the inner circumference of the seal and the outer circumference of the pole.

[0017] In some embodiments of the present application, the inner diameter n of the seal is greater than the diameter a of the pole.

[0018] In some embodiments of the present application, when a second gap is formed between the seal and the transition ring, a second gap is formed between the inner circumference of the transition ring and the outer circumference of the seal.

[0019] In some embodiments of the present application, the outer diameter m of the seal is smaller than the inner diameter b of the transition ring.

[0020] In some embodiments of the present application, along the thickness direction of the cover plate, the seal, the spacer ring, and the insulating ring are interference fit.

[0021] In some embodiments of the present application, a first sealing groove is provided on one side of the sealing member close to the pole, and a first gap is formed between an inner wall of the first sealing groove and the pole.

[0022] In some embodiments of the present application, a portion of the pole close to the seal has a pole groove; and a first gap is formed between an inner wall of the pole groove and the seal.

[0023] In some embodiments of the present application, the first sealing groove includes a first sub-groove and a second sub-groove, and the first sub-groove and the second sub-groove are centrally symmetrical about the center of the sealing member.

[0024] Along the radial direction of the seal, the length p1 of the line connecting the bottom of the first sub-groove and the bottom of the second sub-groove passing through the center of the seal is greater than the diameter a of the pole.

[0025] In some embodiments of the present application, the pole groove includes a first sub-pole groove and a second sub-pole groove, and the first sub-pole groove and the second sub-pole groove are centrally symmetrical about the center of the seal.

[0026] Along the radial direction of the seal, the length of a line connecting the bottom of the first sub-pole groove and the bottom of the second sub-pole groove through the center of the seal is smaller than the inner diameter of the seal.

[0027] In some embodiments of the present application, a second sealing member groove is provided on one side of the sealing member close to the transition ring, and a second gap is formed between the inner wall of the second sealing member groove and the transition ring.

[0028] In some embodiments of the present application, a portion of the transition ring close to the seal has a connecting groove; and a second gap is formed between the inner wall of the connecting groove and the seal.

[0029] In some embodiments of the present application, the second sealing groove includes a third sub-groove and a fourth sub-groove, and the third sub-groove and the fourth sub-groove are centrally symmetrical about the center of the sealing member.

[0030] Along the radial direction of the seal, a length p2 of a line connecting the bottom of the third sub-groove and the bottom of the fourth sub-groove passing through the center of the seal is smaller than the inner diameter b of the transition ring.

[0031] In some embodiments of the present application, the connecting groove includes a first sub-connecting groove and a second sub-connecting groove, and the first sub-connecting groove and the second sub-connecting groove are centrally symmetrical about the center of the transition ring.

[0032] Along the radial direction of the transition ring, the length of the line connecting the bottom of the first sub-connecting groove and the bottom of the second sub-connecting groove through the center of the transition ring is greater than the outer diameter of the sealing member.

[0033] In a second aspect, an embodiment of the present application provides a battery housing, which includes a housing and a cover plate assembly.

[0034] The shell body has a containing cavity with an opening at one end, and the cover plate assembly covers the opening.

[0035] In some embodiments of the present application, the first gap and / or the second gap of the cover assembly is communicated with the accommodating cavity.

[0036] In a third aspect, an embodiment of the present application provides a battery, the battery comprising a battery cell and a battery casing, wherein the battery cell is located in a receiving cavity of the battery casing.

[0037] In a fourth aspect, an embodiment of the present application provides an electric device, wherein the electric device includes a battery.

[0038] The embodiment of the present application provides a cover assembly, a battery housing, a battery and an electrical device, wherein the cover assembly includes a cover, a pole, a spacer, an insulating ring, a transition ring and a seal. The cover has a through hole; some poles are provided with through holes; the spacer surrounds the outer periphery of the pole; the insulating ring surrounds the outer periphery of the pole and is arranged along the extension direction of the pole and the interval between the spacer; the seal surrounds the outer periphery of the pole; along the extension direction of the pole, the two sides of the seal are respectively sealed against the spacer and the insulating ring; the transition ring surrounds the side of the seal away from the pole and is located between the spacer and the insulating ring. After the battery is finished injecting electrolyte, the electrolyte will flow back to the accommodating cavity under the action of gravity, and the electrolyte will not be retained between the pole and the transition ring. The seal can physically isolate the pole and the transition ring, avoid electrical connection between the pole and the transition ring, avoid electrification of the transition ring, avoid electrical conduction between the pole and the cover assembly, and improve battery safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0040] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of the structure of the cover assembly provided in the embodiment of the present application Figure 1 ;

[0042] Figure 3 A schematic diagram of the structure of the cover assembly provided in the embodiment of the present application Figure 2 ;

[0043] Figure 4 for Figure 3 A magnified image of area A;

[0044] Figure 5 A schematic diagram of the structure of the sealing member of the cover plate assembly according to the embodiment of the present application. Figure 1 ;

[0045] Figure 6 A schematic diagram of the structure of the sealing member of the cover plate assembly according to the embodiment of the present application. Figure 2 ;

[0046] Figure 7 A schematic diagram of the structure of the second embodiment of the sealing member of the cover plate assembly provided in the embodiment of the present application Figure 1 ;

[0047] Figure 8 A schematic diagram of the structure of the second embodiment of the sealing member of the cover plate assembly provided in the embodiment of the present application Figure 2 ;

[0048] Fig. 9 A schematic diagram of the structure of the second embodiment of the sealing member of the cover plate assembly provided in the embodiment of the present application Figure 3 .

[0049] Description of reference numerals:

[0050] 100: housing;

[0051] 200: cover plate; 210: spacer; 212: lead-out plate; 220: transition ring; 230: insulating ring; 240: sealing element; 250: pole; 260: injection hole;

[0052] 300: first sealing groove; 310: second sealing groove.

[0053] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0054] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0055] In the related art, a cover plate is provided at the opening of the battery housing, a through hole is provided at the cover plate, and a pole is located at the through hole, so that the pole leads the current inside the battery. A connecting ring and a sealing ring are also provided at the cover plate, the connecting ring is used to connect the pole and the cover plate, and the sealing ring is located between the connecting ring and the pole to prevent leakage of the electrolyte.

[0056] Along the extension direction of the cover plate, the sealing ring, the pole and the connecting ring are arranged to be interference fit to improve the sealing effect of the cover plate and the pole.

[0057] However, in the process of injecting electrolyte into the battery casing, the sealing ring will deform under the action of pressure, and the sealing ring will no longer have an interference fit with the pole and the connecting ring. This causes the sealing ring to be unable to effectively seal the connecting ring and the pole, and the electrolyte will flow into the gap between the pole and the connecting ring.

[0058] After the electrolyte is injected, the sealing ring will no longer deform, and the electrolyte that flows into the gap will be retained in the space formed between the pole, the connecting ring and the top of the sealing ring, and cannot flow back to the battery's accommodating cavity. Since the pole is made of metal and the connecting ring is also made of metal, the pole and the connecting ring are electrically conductive, and since the connecting ring is connected to the cover plate, and the cover plate is connected to the battery housing, this will cause the cover plate and the battery housing to be charged, reducing the safety of the battery.

[0059] In view of this, the embodiment of the present application provides a cover assembly, a battery housing, a battery and an electrical device, wherein the cover assembly includes a cover, a pole, a spacer, an insulating ring, a transition ring and a seal. The cover has a through hole; some poles are provided with through holes; the spacer surrounds the outer periphery of the pole; the insulating ring surrounds the outer periphery of the pole and is arranged along the extension direction of the pole and the interval of the spacer; the transition ring surrounds the outer periphery of the pole and is located between the spacer and the insulating ring; the seal surrounds the outer periphery of the pole; along the extension direction of the pole, the two sides of the seal are respectively sealed against the spacer and the insulating ring; the transition ring surrounds the side of the seal away from the pole and is located between the spacer and the insulating ring. After the battery is finished injecting electrolyte, the electrolyte will flow back to the accommodating cavity under the action of gravity, and the electrolyte will not be retained between the pole and the transition ring. The seal can physically isolate the pole and the transition ring, avoid electrical connection between the pole and the transition ring, avoid electrification of the transition ring, avoid electrical conduction between the pole and the cover assembly, and improve battery safety.

[0060] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0061] In a first aspect, an embodiment of the present application provides an electric device. The electric device includes a battery. The electric device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The present application does not limit the specific type of the electric device.

[0062] In a second aspect, an embodiment of the present application provides a battery, the battery comprising a battery cell and a battery casing, the battery cell being located in a receiving cavity of the battery casing.

[0063] The battery may be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel cadmium battery, etc. The present application does not limit the type of battery.

[0064] Thirdly, refer to Figure 1 As shown, an embodiment of the present application provides a battery housing, which includes a housing 100 and a cover assembly.

[0065] The housing 100 has a receiving cavity with an opening at one end, and the cover assembly covers the opening.

[0066] Exemplarily, the housing 100 is a structural part of the battery, and is used to contain internal components of the battery, such as electrodes and electrolyte. The housing 100 has mechanical strength and chemical stability to protect the internal components of the battery from the influence of the external environment.

[0067] The cap assembly is used to close the opening portion of the housing 100 and provide electrical connection and safety functions for the battery.

[0068] As a feasible implementation manner, the first gap of the cover plate assembly is communicated with the accommodating cavity, so that the electrolyte retained in the first gap flows back to the accommodating cavity.

[0069] As a feasible implementation manner, the second gap of the cover plate assembly is communicated with the accommodating cavity, so that the electrolyte retained in the second gap flows back to the accommodating cavity.

[0070] Fourthly, refer to Figures 2 to 4 As shown, an embodiment of the present application provides a cover plate assembly. The cover plate assembly is used for a battery. The cover plate assembly includes:

[0071] A cover plate 200 having a through hole;

[0072] The pole 250, part of which is provided with a through hole;

[0073] The spacer 210 surrounds the outer circumference of the pole 250;

[0074] The insulating ring 230 surrounds the outer circumference of the pole 250 and is spaced apart from the spacer 210 along the extending direction of the pole 250;

[0075] The sealing member 240 surrounds the outer circumference of the pole 250; along the extension direction of the pole 250, two sides of the sealing member 240 are respectively sealed against the spacer 210 and the insulating ring 230;

[0076] The transition ring 220 surrounds the side of the sealing member 240 facing away from the pole 250 and is located between the spacer 210 and the insulating ring 230 .

[0077] For example, refer to Figure 3 As shown, the thickness direction of the cover plate 200 is referenced Figure 3 The extension direction of the cover plate 200 is shown in the direction Y. Figure 3 The direction indicated by X.

[0078] Exemplarily, the cover plate 200 covers the opening of the battery housing accommodating cavity to prevent leakage of the electrolyte in the accommodating cavity. The cover plate 200 provides a preliminary physical barrier for the electrolyte flowing in the accommodating cavity to prevent leakage of the electrolyte.

[0079] The pole 250 is the interface between the battery and the external circuit, responsible for conducting the current generated inside the battery to the external load, or conducting the current to the inside of the battery during charging. The material of the pole 250 includes conductive copper, aluminum, and nickel. In this way, the efficiency of current conduction is ensured and energy loss is reduced.

[0080] The cover plate 200 is also provided with a liquid injection hole 260. The electrolyte is injected into the accommodating cavity of the battery housing through the liquid injection hole 260.

[0081] Exemplarily, the side of the spacer 210 close to the insulating ring 230, the side of the transition ring 220 close to the pole 250, the side of the insulating ring 230 close to the spacer 210, and the periphery of the pole 250 surround and form an installation area. The seal 240 surrounds the periphery of the pole 250 and is located in the installation area.

[0082] Along the extension direction of the pole 250, the two sides of the seal 240 are respectively sealed against the insulating ring 230 and the spacer 210. During the process of injecting the electrolyte into the accommodating cavity, due to the change of pressure, part of the electrolyte will move toward the cover assembly and enter the installation area. By sealingly abutting the seal 240 against the spacer 210 and sealingly abutting the seal 240 against the insulating ring 230, after the electrolyte is injected into the battery, since the two sides of the seal 240 are sealedly connected to the insulating ring 230 and the spacer 210 respectively, the seal 240 can physically isolate the pole 250 and the transition ring 220, and the electrolyte will not be retained between the pole 250 and the transition ring 220. When the pole 250 is charged, the seal 240 physically isolates the pole 250 and the transition ring 220, which can effectively prevent current leakage between the pole 250 and the transition ring 220, avoid the transition ring 220 being charged, and avoid electrical conduction between the pole 250 and the cover assembly, thereby improving the safety of the battery.

[0083] Exemplarily, the spacer 210 includes an insulating spacer. The insulating spacer is sleeved on the outer periphery of the pole 250. In the battery, the pole 250 is connected to the current collector of the battery and the current transmitted from the current collector to the pole 250 is extracted. By setting the spacer 210, the spacer 210 is used to physically isolate the pole 250 from the remaining components in the battery to prevent short circuit. The spacer 210 can effectively block the unexpected path of the current and avoid electrical connection between the current collector and the pole 250 in the battery, thereby ensuring the safety and normal operation of the battery.

[0084] Exemplarily, the cap plate assembly further includes a lead-out tab 212. The lead-out tab 212 is disposed on a side of the insulating spacer away from the cap plate 200. The lead-out tab 212 is used to electrically connect the current collector and the pole 250. The lead-out tab 212 enables current to be efficiently conducted to the pole 250.

[0085] The upper surface of the lead-out piece 212 abuts against the lower surface of the insulating spacer along the thickness direction of the cover plate 200. The lead-out piece 212 is welded to the pole 250 to form an electrical connection.

[0086] The lead-out plate 212 is conductive, and the material of the lead-out plate 212 includes copper and aluminum.

[0087] The transition ring 220 is connected to the cover plate 200. The cover plate 200 is provided with a cover plate groove, which is connected to the through hole, and the notch of the cover plate groove faces the through hole. Part of the transition ring 220 is placed in the cover plate groove. Part of the transition ring 220 extends out of the cover plate groove and extends in a direction away from the spacer 210.

[0088] In some embodiments, the cover plate 200 is a metal plate. The transition ring 220 is a transition ring made of metal. The transition ring 220 and the cover plate 200 are connected by welding. By welding the transition ring 220 and the cover plate 200, the air tightness is improved to prevent gas or liquid (such as electrolyte) from leaking through the connection between the cover plate 200 and the transition ring 220. Moreover, the connection of the cover plate 200 and the transition ring 220 by welding improves the consistency of the connection area and reduces potential leakage points. In addition, the connection of the cover plate 200 and the transition ring 220 by welding improves the connection strength, which can withstand the vibration, impact and mechanical stress that the battery may encounter during use.

[0089] For example, the transition ring 220 may be an aluminum transition ring. The transition ring 220 has strength and load-bearing capacity, and can withstand mechanical stress and impact that the battery may encounter during use. The transition ring 220 is not easily deformed under high load conditions, and the stability and integrity of the cover plate 200 and the transition ring 220 are maintained.

[0090] Along the thickness direction of the cover plate 200 , the insulating ring 230 is located on a side of the transition ring 220 away from the spacer 210 , and the insulating ring 230 is connected to the pole 250 .

[0091] Exemplarily, the insulating ring 230 may be a ceramic ring. The insulating ring 230 has electrical insulation properties. The insulating ring 230 is used for electrical insulation to prevent accidental contact between the pole 250 and the cover plate 200 or other conductive components, thereby avoiding a short circuit.

[0092] The insulating ring 230 is located on the side of the cover plate 200 away from the battery accommodating cavity. The bottom of the insulating ring 230 and the portion of the cover plate groove where the transition ring 220 extends are brazed. Brazing can form a continuous metal joint at the connection between the transition ring 220 and the insulating ring 230, improve the sealing of the transition ring 220 and the insulating ring 230, and prevent leakage of the electrolyte. Moreover, the brazing material flows and fills the connection gap between the transition ring 220 and the insulating ring 230 during the heating process, and a uniform sealing layer is formed between the transition ring 220 and the insulating ring 230, reducing potential leakage points. In addition, the transition ring 220 and the insulating ring 230 are connected by brazing, which improves the connection strength of the transition ring 220 and the insulating ring 230. The connection between the transition ring 220 and the insulating ring 230 can withstand the vibration and mechanical stress that the battery may encounter during use, ensuring the long-term stability of the connection.

[0093] In some embodiments, a metal layer is deposited on the surface of the insulating ring 230 , and the transition ring 220 and the insulating ring 230 are connected via the metal layer and solder.

[0094] In other embodiments, a brazing material containing active elements (such as titanium and zirconium) is used to connect the transition ring 220 and the insulating ring 230 .

[0095] Furthermore, the top of the insulating ring 230 is brazed to the pole 250. The insulating ring 230 and the pole 250 are connected by brazing, which improves the air tightness of the connection between the insulating ring 230 and the pole 250, improves the sealing of the connection between the insulating ring 230 and the pole 250, and prevents leakage of the electrolyte. Moreover, when the insulating ring 230 and the pole 250 are connected by the brazing material, the brazing material flows into the connection gap between the insulating ring 230 and the pole 250 by capillary action when heated, fills all tiny gaps, and forms a continuous sealing layer.

[0096] In addition, the insulating ring 230 and the pole 250 are connected by brazing, which improves the connection strength between the insulating ring 230 and the pole 250 and reduces the failure risk of the connection.

[0097] In this way, the spacer 210, the transition ring 220, and the insulating ring 230 form a complete connection and sealing system to prevent leakage of the electrolyte and reduce possible displacement or loosening of the pole 250 during operation.

[0098] As a feasible implementation, there is a first gap between the sealing member 240 and the pole 250 .

[0099] During the process of injecting the electrolyte into the accommodating cavity, due to the change in pressure, part of the electrolyte will move toward the cover plate assembly and enter the first gap. By setting the first gap between the seal 240 and the pole 250, after the battery is finished injecting the electrolyte, since the first gap is connected to the accommodating cavity, the electrolyte located in the first gap will flow back into the accommodating cavity under the action of its own gravity, thereby avoiding electrical conduction between the pole 250 and the transition ring 220, and improving the safety of the battery.

[0100] As a feasible implementation manner, a second gap is formed between the sealing member 240 and the transition ring 220 .

[0101] During the process of injecting electrolyte into the receiving chamber, due to the change of pressure, part of the electrolyte will move toward the cover plate assembly and enter the cover plate assembly. By setting a second gap between the seal 240 and the transition ring 220, after the battery is finished injecting electrolyte, since the second gap is connected to the receiving chamber, the electrolyte located at the second gap will flow back into the receiving chamber under the action of its own gravity, thereby avoiding the formation of an electrolytic cell between the pole 250 and the transition ring 220 through the electrolyte, avoiding electrical conduction between the pole 250 and the transition ring 220, avoiding the battery shell from being charged, and improving the battery safety.

[0102] As a feasible implementation method, refer to Figure 5 and Figure 6 As shown, the seal 240 is annular and surrounds the outer circumference of the pole 250 .

[0103] The first gap is formed between the inner peripheral side of the seal member 240 and the outer peripheral side of the pole 250 .

[0104] Exemplarily, the seal 240 is a sealing ring. The annular seal 240 can be evenly distributed on the outer circumference of the pole 250 to ensure that the seal 240 provides consistent sealing performance in all directions.

[0105] The first gap provides a buffer zone for the electrolyte, allowing the electrolyte to flow in this area and eventually flow back into the accommodating cavity, thereby reducing the risk of electrolyte retention.

[0106] Exemplarily, the inner circumference of the seal 240 refers to the surface close to the center of the seal 240. For an annular seal 240 (such as an O-ring), the inner circumference of the seal 240 is the inner diameter portion of the annular seal 240.

[0107] The outer peripheral side of the pole 250 refers to the outer peripheral surface of the pole 250 .

[0108] As a feasible implementation, the inner diameter n of the seal 240 is greater than the diameter a of the pole 250. In this way, a first gap is formed between the inner circumference of the seal 240 and the outer circumference of the pole 250, and the electrolyte flows into the first gap during the process of injecting electrolyte into the battery. Since the first gap is connected to the accommodating cavity, after the battery is injected, the electrolyte flows back into the accommodating cavity of the battery under the action of gravity, which helps to avoid electrochemical reaction between the pole 250 and the transition ring 220 through the electrolyte.

[0109] In contrast, when the inner diameter n of the seal 240 is smaller than the diameter a of the pole 250, there is an interference fit between the seal 240 and the pole 250. This results in the first gap and the accommodating cavity being disconnected, which causes the electrolyte flowing between the transition ring 220, the insulating ring 230, and the pole 250 during the battery filling process to be unable to flow back to the accommodating cavity, and a local electrolytic cell is formed between the transition ring 220 and the pole 250 through the electrolyte. The presence of this electrolytic cell can cause abnormal battery voltage, corrosion inside the battery, etc., seriously affecting battery safety.

[0110] As an achievable implementation manner, when a second gap is formed between the sealing member 240 and the transition ring 220 , a second gap is formed between the inner circumference of the transition ring 220 and the outer circumference of the sealing member 240 .

[0111] Exemplarily, the annular transition ring 220 can be evenly distributed on the outer circumference of the pole 250 to ensure that every part of the outer circumference of the pole 250 is surrounded, thereby improving the sealing of the connection between the pole 250 and the cover plate 200 .

[0112] The second gap provides a buffer zone for the electrolyte, allowing the electrolyte to flow in this area and eventually flow back into the accommodating cavity, further reducing the risk of electrolyte retention.

[0113] As a feasible implementation, the outer diameter m of the seal 240 is smaller than the inner diameter b of the transition ring 220. In this way, a second gap is formed between the outer peripheral side of the seal 240 and the inner peripheral side of the transition ring 220, and the electrolyte flows into the second gap during the process of injecting electrolyte into the battery. Since the second gap is connected to the accommodating cavity, after the battery is injected, the electrolyte flows back to the accommodating cavity of the battery under the action of gravity, which helps to avoid electrochemical reaction between the pole 250 and the transition ring 220 through the electrolyte.

[0114] In contrast, when the outer diameter m of the seal 240 is greater than the inner diameter b of the transition ring 220, the seal 240 and the transition ring 220 are interference-fitted. This causes the second gap to be disconnected from the accommodating cavity, which causes the electrolyte that flows between the transition ring 220, the insulating ring 230, and the pole 250 during the battery filling process to be unable to flow back to the accommodating cavity, and a local electrolytic cell is formed between the transition ring 220 and the pole 250 through the electrolyte. The presence of this electrolytic cell can cause abnormal battery voltage, corrosion inside the battery, etc., seriously affecting battery safety.

[0115] As a feasible implementation, along the thickness direction of the cover plate 200 , the seal 240 , the spacer 210 , and the insulating ring 230 are in interference fit.

[0116] When the seal 240 is not assembled between the transition ring 220 and the pole, the distance c between the spacer 210 and the insulating ring 230 is smaller than the height h of the seal 240 .

[0117] After the seal 240 is assembled between the transition ring 220 and the pole 250, in the thickness direction of the cover plate 200, the two ends of the seal 240 are interference fit with the spacer 210 and the insulating ring 230. In the extension direction of the cover plate 200, the seal 240 and the pole 250 are clearance fit, and there is a first gap between the seal 240 and the pole 250. The seal 240 and the transition ring 220 are clearance fit. There is a second gap between the seal 240 and the transition ring 220. In this way, along the extension direction of the cover plate 200, the seal 240 forms a physical barrier between the transition ring 220 and the pole 250, and the pole 250 and the transition ring 220 are electrically insulated, thereby avoiding the formation of a primary battery between the transition ring 220 and the pole 250 through the electrolyte.

[0118] At the same time, the electrolyte that flows into the installation area between the pole 250 and the transition ring 220 after injection flows back to the accommodating cavity along the first gap and the second gap, and will not be retained in the first gap and the second gap and form a local electrolytic cell with the pole 250 and the transition ring 220 to cause corrosion, thereby affecting the safety of the battery.

[0119] When the pole 250 carries voltage, the seal 240 physically isolates the pole 250 from the transition ring 220, which can effectively prevent current leakage between the pole 250 and the transition ring 220, thereby avoiding electrical breakdown and improving battery safety.

[0120] Among them, interference fit is a mechanical fit method in which the matching dimensions of two parts are designed to produce interference during assembly, that is, the outer dimensions of the parts are slightly larger than the inner dimensions of their matching holes. This fit method will generate a certain amount of pressure or stress after assembly, so that the two parts form a close contact.

[0121] A clearance fit is a type of mechanical assembly in which there is a certain amount of clearance between two mating parts. This fit allows the mating parts to move or adjust relatively freely after assembly.

[0122] As a feasible implementation method, refer to Figures 7 to 9 As shown, a first sealing groove 300 is provided on one side of the sealing member 240 close to the pole 250 , and a first gap is formed between the inner wall of the first sealing groove 300 and the pole 250 .

[0123] In some embodiments, the portion of the inner circumference of the seal 240 where the first seal groove 300 is not formed abuts against the pole 250 , and a first gap is formed between the inner wall of the first seal groove 300 and the pole 250 .

[0124] During the process of injecting electrolyte into the accommodating chamber, due to the change in pressure, part of the electrolyte will move toward the cover assembly, and part of the electrolyte will flow to the first gap formed between the first sealing groove 300 of the seal 240 and the pole 250. After the battery finishes injecting electrolyte, since the first gap is connected to the accommodating chamber, the electrolyte located in the first gap will flow back into the accommodating chamber under the action of its own gravity, thereby avoiding the electrolyte from being retained in the cover assembly and improving the sealing of the cover assembly.

[0125] Exemplarily, there are multiple first sealing grooves 300. Along the circumference of the sealing member 240, multiple first sealing grooves 300 are arranged at intervals on the inner circumference of the sealing member 240. In this way, multiple first gaps are formed between the inner walls of the multiple first sealing grooves 300 and the pole 250. The arrangement of the multiple first gaps provides multiple loop paths for the electrolyte to flow back to the accommodating cavity, thereby increasing the flow rate of the electrolyte, reducing the possibility of the electrolyte being retained between the sealing member 240 and the pole 250, and preventing the accumulation of the electrolyte.

[0126] In some embodiments, along the circumference of the seal 240 , intervals between adjacent first seal grooves 300 are equal.

[0127] As an achievable implementation, the first sealing member groove 300 includes a first sub-groove and a second sub-groove, and the first sub-groove and the second sub-groove are centrally symmetrical about the center of the sealing member 240. Figure 7 As shown, the center of the seal 240 refers to the geometric center of the seal 240. The central symmetric design of the first sub-groove and the second sub-groove provides a structural balance, so that the seal 240 can evenly distribute pressure when subjected to force.

[0128] Along the radial direction of the seal 240, the length p1 of the line connecting the bottom of the first sub-groove and the bottom of the second sub-groove passing through the center of the seal 240 is greater than the diameter a of the pole 250. In this way, a first gap is formed between the inner wall of the first seal groove 300 and the outer peripheral side of the pole 250. During the process of injecting electrolyte into the battery, the electrolyte flows into the first gap. Since the first gap is connected to the accommodating cavity, after the battery injection is completed, the electrolyte flows back to the accommodating cavity of the battery under the action of gravity, which helps to avoid electrochemical reaction between the pole 250 and the transition ring 220 through the electrolyte.

[0129] As a feasible implementation manner, a portion of the pole 250 close to the seal 240 has a pole groove; and a first gap is formed between the inner wall of the pole groove and the seal 240 .

[0130] The portion of the outer circumference of the pole 250 where the pole groove is not formed abuts against the inner circumference of the seal 240 , and a first gap is formed between the portion of the outer circumference of the pole 250 where the pole groove is formed and the inner circumference of the seal 240 .

[0131] After the injection is completed, the electrolyte located between the inner wall of the pole groove and the inner circumference of the seal 240 (ie, the electrolyte in the first gap) can flow back to the accommodating cavity of the battery.

[0132] As a feasible implementation, the pole groove includes a first sub-pole groove and a second sub-pole groove, and the first sub-pole groove and the second sub-pole groove are centrally symmetrical about the center of the seal 240. The centrally symmetrical design of the first sub-pole groove and the second sub-pole groove provides a structural balance, so that the pole 250 can evenly distribute pressure when subjected to force.

[0133] Along the radial direction of the seal 240, the length of the line connecting the bottom of the first sub-pole groove and the bottom of the second sub-pole groove through the center of the seal 240 is less than the inner diameter of the seal 240. In this way, a first gap is formed between the inner wall of the pole groove and the inner circumference of the seal 240. During the process of injecting electrolyte into the battery, the electrolyte flows to the first gap. Since the first gap is connected to the accommodating cavity, after the battery injection is completed, the electrolyte flows back to the accommodating cavity of the battery under the action of gravity, which helps to avoid electrochemical reaction between the pole 250 and the transition ring 220 through the electrolyte.

[0134] As a feasible implementation, a second sealing groove 310 is provided on a side of the sealing member 240 close to the transition ring 220 , and a second gap is formed between an inner wall of the second sealing groove 310 and the transition ring 220 .

[0135] Exemplarily, the portion of the outer circumferential side of the seal 240 where the second seal groove 310 is not formed abuts against the inner circumferential side of the transition ring 220 , and a second gap is formed between the portion of the outer circumferential side of the seal 240 where the second seal groove 310 is formed and the inner circumferential side of the transition ring 220 .

[0136] After the injection is completed, the electrolyte located between the inner wall of the second sealing groove 310 and the inner circumference of the transition ring 220 (ie, the electrolyte in the second gap) can flow back to the accommodating cavity of the battery.

[0137] Exemplarily, there are multiple second sealing grooves 310. Along the circumference of the sealing member 240, multiple second sealing grooves 310 are arranged at intervals on the outer peripheral side of the sealing member 240. In this way, multiple second gaps are formed between the inner walls of the multiple second sealing grooves 310 and the pole 250. The arrangement of the multiple second gaps provides multiple loop paths for the electrolyte to flow back to the accommodating cavity, thereby increasing the flow rate of the electrolyte, reducing the possibility of the electrolyte being retained between the sealing member 240 and the pole 250, and preventing the accumulation of the electrolyte.

[0138] In some embodiments, along the circumference of the seal 240 , intervals between adjacent second seal grooves 310 are equal.

[0139] As an achievable implementation, the second sealing groove 310 includes a third sub-groove and a fourth sub-groove, and the third sub-groove and the fourth sub-groove are centrally symmetrical about the center of the sealing member 240. The centrally symmetrical design of the third sub-groove and the fourth sub-groove provides a structural balance, so that the sealing member 240 can evenly distribute the pressure when subjected to force.

[0140] Along the radial direction of the seal 240, the length p2 of the line connecting the bottom of the third sub-groove and the bottom of the fourth sub-groove passing through the center of the seal 240 is less than the inner diameter b of the transition ring 220. In this way, a second gap is formed between the inner wall of the second seal groove 310 and the outer peripheral side of the pole 250. During the process of injecting electrolyte into the battery, the electrolyte flows into the second gap. Since the second gap is connected to the accommodating cavity, after the battery injection is completed, the electrolyte flows back to the accommodating cavity of the battery under the action of gravity, which helps to avoid electrochemical reaction between the pole 250 and the transition ring 220 through the electrolyte.

[0141] As a feasible implementation manner, a portion of the transition ring 220 close to the seal 240 has a connecting groove; and a second gap is formed between the inner wall of the connecting groove and the seal 240 .

[0142] Exemplarily, the portion of the inner circumference of the transition ring 220 where no connecting groove is formed abuts against the outer circumference of the seal 240 , and a second gap is formed between the portion of the inner circumference of the transition ring 220 where the connecting groove is formed and the outer circumference of the seal 240 .

[0143] After the injection is completed, the electrolyte located between the inner wall of the connecting groove and the outer peripheral side of the sealing member 240 (ie, the electrolyte in the second gap) can flow back to the accommodating cavity of the battery.

[0144] As an achievable implementation, the connection groove includes a first sub-connection groove and a second sub-connection groove, and the first sub-connection groove and the second sub-connection groove are centrally symmetrical with respect to the center of the transition ring 220. The centrally symmetrical design of the first sub-connection groove and the second sub-connection groove provides a structural balance, so that the transition ring 220 can evenly distribute pressure when subjected to force.

[0145] Along the radial direction of the transition ring 220, the length of the line connecting the bottom of the first sub-connection groove and the bottom of the second sub-connection groove through the center of the transition ring 220 is greater than the outer diameter of the seal 240. In this way, a second gap is formed between the inner wall of the connection groove and the outer peripheral side of the seal 240. During the process of injecting electrolyte into the battery, the electrolyte flows to the second gap. Since the second gap is connected to the accommodating cavity, after the battery injection is completed, the electrolyte flows back to the accommodating cavity of the battery under the action of gravity, which helps to avoid electrochemical reaction between the pole 250 and the transition ring 220 through the electrolyte.

[0146] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A cover plate assembly for a battery, characterized in that: The cover plate assembly comprises: A cover plate (200) having a through hole; A pole (250), a portion of the pole (250) being provided with the through hole; A spacer (210) surrounding the outer circumference of the pole (250); An insulating ring (230) surrounds the outer circumference of the pole (250) and is arranged in an extension direction of the pole (250) and spaced apart from the spacer (210); A sealing member (240) surrounds the outer circumference of the pole (250); along the extension direction of the pole (250), two sides of the sealing member (240) are respectively sealed against the spacer (210) and the insulating ring (230); A transition ring (220) surrounds the side of the sealing member (240) facing away from the pole (250) and is located between the spacer (210) and the insulating ring (230).

2. The cover plate assembly according to claim 1, characterized in that: A first gap is formed between the sealing member (240) and the pole (250), and / or a second gap is formed between the sealing member (240) and the transition ring (220).

3. The cover plate assembly according to claim 2, characterized in that: The transition ring (220) is connected to the cover plate (200).

4. The cover plate assembly according to claim 2, characterized in that: When a first gap is present between the seal (240) and the pole (250), the seal (240) is annular, and the first gap is formed between the inner circumference of the seal (240) and the outer circumference of the pole (250).

5. The cover plate assembly according to claim 4, characterized in that: The inner diameter n of the sealing member (240) is greater than the diameter a of the pole (250).

6. The cover plate assembly according to claim 4, characterized in that: When a second gap is formed between the sealing member (240) and the transition ring (220), the second gap is formed between the inner peripheral side of the transition ring (220) and the outer peripheral side of the sealing member (240).

7. The cover plate assembly according to claim 6, characterized in that: The outer diameter m of the sealing element (240) is smaller than the inner diameter b of the transition ring (220).

8. The cover plate assembly according to claim 6, characterized in that: Along the thickness direction of the cover plate (200), the sealing member (240), the spacer (210) and the insulating ring (230) are in interference fit.

9. The cover plate assembly according to any one of claims 4 to 8, characterized in that: A first sealing groove (300) is provided on one side of the sealing member (240) close to the pole (250), and the first gap is formed between the inner wall of the first sealing groove (300) and the pole (250).

10. The cover plate assembly according to any one of claims 6 to 8, characterized in that: The portion of the pole (250) close to the seal (240) has a pole groove; the first gap is formed between the inner wall of the pole groove and the seal (240).

11. The cover plate assembly according to claim 9, characterized in that: The first sealing groove (300) comprises a first sub-groove and a second sub-groove, wherein the first sub-groove and the second sub-groove are centrally symmetrical about the center of the sealing member (240); Along the radial direction of the seal (240), the length p1 of a line connecting the bottom of the first sub-groove and the bottom of the second sub-groove passing through the center of the seal (240) is greater than the diameter a of the pole (250).

12. The cover plate assembly according to claim 10, characterized in that: The pole groove comprises a first sub-pole groove and a second sub-pole groove, wherein the first sub-pole groove and the second sub-pole groove are centrally symmetrical about the center of the sealing member (240); Along the radial direction of the seal (240), the length of a line connecting the bottom of the first sub-pole groove and the bottom of the second sub-pole groove through the center of the seal (240) is smaller than the inner diameter of the seal (240).

13. The cover plate assembly according to any one of claims 6 to 8, characterized in that: A second sealing groove (310) is provided on one side of the sealing member (240) close to the transition ring (220), and the second gap is formed between the inner wall of the second sealing groove (310) and the transition ring (220).

14. The cover plate assembly according to any one of claims 6 to 8, characterized in that: A connecting groove is provided on one side of the transition ring (220) close to the sealing member (240); and the second gap is formed between the inner wall of the connecting groove and the sealing member (240).

15. The cover plate assembly according to claim 13, characterized in that: The second sealing groove (310) comprises a third sub-groove and a fourth sub-groove, and the third sub-groove and the fourth sub-groove are centrally symmetrical about the center of the sealing member (240); Along the radial direction of the seal (240), the length p2 of the line connecting the bottom of the third sub-groove and the bottom of the fourth sub-groove passing through the center of the seal (240) is smaller than the inner diameter b of the transition ring (220).

16. The cover plate assembly according to claim 14, characterized in that: The connecting groove comprises a first sub-connecting groove and a second sub-connecting groove, wherein the first sub-connecting groove and the second sub-connecting groove are centrally symmetrical about the center of the transition ring (220); Along the radial direction of the transition ring (220), the length of a line connecting the bottom of the first sub-connecting groove and the bottom of the second sub-connecting groove through the center of the transition ring (220) is greater than the outer diameter of the sealing element (240).

17. A battery casing, characterized in that: A cover plate assembly comprising a housing (100) and any one of claims 1 to 16; The housing (100) has a receiving cavity with an opening at one end, and the cover plate assembly covers the opening.

18. The battery casing according to claim 17, characterized in that: The first gap and / or the second gap of the cover plate assembly is communicated with the accommodating cavity.

19. A battery, characterized in that: It comprises a battery cell and the battery casing according to claim 17 or 18, wherein the battery cell is located in a receiving cavity of the battery casing.

20. An electrical equipment, characterized in that: Comprising the battery of claim 19.

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