Battery case, battery, battery assembly, and electric device

Abstract

A battery case (10), comprising: a shell (11), the shell (11) being provided with an inner cavity (111) and two through holes (112) in communication with the inner cavity (111); two connecting pieces (12); and two sealing members (13). One end of a first connecting piece (121) is located in the inner cavity (111), the other end of the first connecting piece (121) passes through a first through hole (1121) to extend out of the shell (11), one end of a second connecting piece (122) is located in the inner cavity (111), and the other end of the second connecting piece (122) passes through a second through hole (1122) to extend out of the shell (11); and the two sealing members (13) are both located outside the shell (11), each sealing member (13) is respectively sleeved on the outer side of the corresponding connecting piece (12), the outer edge of each sealing member (13) is further respectively fixed to the shell (11), and each sealing member (13) is configured to shield a gap between the corresponding connecting piece (12) and the corresponding through hole (112). A battery (100) comprising the battery case (10), and an electric device are provided.

Description

Battery casings, batteries, battery components and electrical equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 18, 2023, with application number 202311753561.4 and invention name “Battery casing, battery, battery assembly and electrical equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of batteries, and in particular to a battery housing, a battery comprising the battery housing, a battery assembly comprising the battery, and an electrical device comprising the battery assembly. Background Art

[0003] Batteries are generally divided into soft-pack batteries and hard-pack batteries. Soft-pack batteries typically use aluminum-plastic film to support the battery cells, but the structural strength of aluminum-plastic film is relatively weak. Increasing the thickness of the aluminum-plastic film to increase strength will lead to increased battery costs.

[0004] For hard-pack batteries, a metal casing typically supports the battery cells, with a cover plate equipped with conductive posts providing electrical connection between the cells and the external environment. However, in actual manufacturing, high assembly precision between the cover plate and the metal casing is required to ensure a sealed battery, which increases costs.

[0005] Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of this application is to provide a battery housing with improved sealing performance, a battery including the battery housing, a battery assembly including the battery, and an electrical device including the battery assembly. Specifically, the present application includes the following technical solutions:

[0007] In the first aspect, an embodiment of the present application provides a battery shell, comprising a shell, the shell being provided with an inner cavity and two through holes connecting the inner cavity; two connecting pieces; and two sealing members; wherein, one end of the first connecting piece is located in the inner cavity, and the other end passes through the first through hole and extends out of the shell, and one end of the second connecting piece is located in the inner cavity, and the other end passes through the second through hole and extends out of the shell; both of the sealing members are located outside the shell, each of the sealing members is respectively sleeved on the outside of one of the connecting pieces, and the outer edge of each of the sealing members is also respectively fixed to the shell, and each of the sealing members is used to cover the gap between one of the connecting pieces and the through hole.

[0008] The battery housing of the present application is provided with two connecting pieces extending out of the shell, and a sealing member is provided which is sleeved on the outer edge of the connecting piece, so as to utilize the sealing member to seal the through hole and the gap between the connecting piece, thereby improving the sealing performance of the battery housing of the present application.

[0009] In one embodiment, the housing is provided with two protrusions, the two through holes are respectively provided on the two protrusions, and the sealing member is sleeved on a portion of the connecting piece that protrudes from the protrusions by at least 0.05 mm.

[0010] In one embodiment, the shell includes a shell body and a cover body, and two protrusions are arranged at the connection between the shell body and the cover body. Each protrusion includes a first part located on the shell body and a second part located on the cover body. The seal is also used to cover the gap between the first part and the second part.

[0011] In one embodiment, the outer edge of the sealing member is sleeved on the outer surface of the protrusion, and the distance between the outer edge of the sealing member and the outer surface contour of the protrusion is greater than or equal to 0.05 mm.

[0012] In one embodiment, along the length direction of the connecting piece, the length of the through hole is greater than or equal to 0.275 mm.

[0013] In one embodiment, the battery housing further includes a second sealing member, wherein the second sealing member is at least partially located in the through hole and between the connecting piece and the through hole.

[0014] In one embodiment, the second sealing member is filled between the connecting piece and the through hole, and the second sealing member is also used to seal the gap between the through hole and the connecting piece.

[0015] In one embodiment, the second sealing member partially protrudes from the housing, and along the length direction of the connecting piece, the length of the second sealing member protruding from the housing is greater than or equal to 0.1 mm.

[0016] In one embodiment, the housing is made of metal material, and the second sealing component has insulating properties.

[0017] In one embodiment, the housing further includes a recessed portion, and the ends of the two connecting pieces extending out of the housing are at least partially located in the recessed portion.

[0018] In one embodiment, the shell body and the cover are made of metal material.

[0019] In one embodiment, the shell body includes a bottom plate and a side plate, the side plate surrounds the edge of the bottom plate, and the end of the side plate away from the bottom plate is in contact with the cover body to form the inner cavity.

[0020] In one embodiment, the shell body is further provided with a liquid injection hole, and the liquid injection hole is connected to the shell.

[0021] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell and a battery casing according to the first aspect, wherein the battery cell is housed in an inner cavity of the battery casing, and two connecting pieces of the battery casing are respectively connected to the positive electrode and negative electrode of the battery cell.

[0022] In one embodiment, the battery housing further includes a plurality of fixing members, wherein the fixing members are arranged on the outer edge of the housing.

[0023] In a third aspect, an embodiment of the present application provides a battery assembly, comprising a battery tray and the battery according to the second aspect, wherein the battery is housed in the battery tray.

[0024] In a fourth aspect, an embodiment of the present application provides an electrical device comprising a battery assembly according to the third aspect.

[0025] It can be understood that the batteries, battery assemblies, and electrical equipment provided in the second to fourth aspects of the present application all have the effect of improving sealing performance and reducing costs because they adopt the battery housing provided in the first aspect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic structural diagram of a battery provided in one embodiment of the present application;

[0027] FIG2 is an exploded schematic diagram of a battery provided in one embodiment of the present application;

[0028] FIG3 is a schematic diagram of a partial structure of a battery provided in one embodiment of the present application;

[0029] FIG4 is a partial cross-sectional schematic diagram of a battery provided in one embodiment of the present application;

[0030] FIG5 is a partial top view of a battery provided in one embodiment of the present application;

[0031] FIG6 is another partial top view of a battery provided in one embodiment of the present application;

[0032] FIG7 is another exploded schematic diagram of a battery provided in one embodiment of the present application;

[0033] FIG8 is another structural schematic diagram of a battery provided in one embodiment of the present application;

[0034] FIG9 is another structural schematic diagram of a battery provided in one embodiment of the present application;

[0035] FIG10 is another structural diagram of a battery provided in one embodiment of the present application;

[0036] FIG11 is a schematic structural diagram of a battery cell provided in one embodiment of the present application;

[0037] FIG12 is another schematic structural diagram of a battery cell provided in an embodiment of the present application.

[0038] Description of reference numerals:

[0039] 100-battery, 10-battery casing, 20-battery cell.

[0040] 11-shell, 111-inner cavity, 21-pole core, 22-electrode, 221-positive electrode, 222-negative electrode, 112-through hole, 1121-first through hole, 1122-second through hole, 12-connecting piece, 121-first connecting piece, 122-second connecting piece, 13-seal, 131-positive electrode seal, 132-negative electrode seal, 113-bump, 1131-first bump, 1132-second bump, 114-shell body, 115-cover, 1141-first part, 1151-second part, 14-second seal, 116-recessed part, 1142-bottom plate, 1143-side plate, 114a-epitaxial structure, 15-liquid injection hole, 16-fixing part, 21a-positive electrode core, 21b-negative electrode core, 23-insulating film. DETAILED DESCRIPTION

[0041] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0042] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application include direct and indirect connections (couplings) unless otherwise specified. The directional terms mentioned in the present application, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. It should be noted that the terms "first," "second," and so on, in the specification, claims, and accompanying drawings of this application are used to distinguish between different objects, not to describe a specific order. Furthermore, the terms "include," "may include," "comprise," or "may include" as used in this application indicate the presence of the corresponding functions, operations, components, etc. disclosed, and do not limit the presence or absence of one or more additional functions, operations, components, etc. Furthermore, the terms "include" or "comprising" indicate the presence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0045] The electrical equipment provided in this application includes a battery assembly. Exemplarily, the electrical equipment is a vehicle, which includes a vehicle body and a battery assembly, and the battery assembly is housed in the vehicle body to protect the battery assembly. The battery assembly is used to provide electrical energy to the vehicle and drive the vehicle. Among them, the battery assembly includes batteries and a battery tray, and multiple batteries connected in parallel and / or in series are housed in the battery tray to protect the batteries. Multiple batteries cooperate with each other to convert the chemical energy stored in the battery into electrical energy and transmit it to the vehicle, thereby realizing the current transmission function of the battery.

[0046] It is understandable that in other embodiments, the electrical equipment of the present application may be other types, and the present application does not impose any particular limitation thereto.

[0047] Please refer to Figure 1 for a schematic diagram of the structure of a battery 100 provided in one embodiment of the present application, and Figure 2 for an exploded schematic diagram of a battery 100 provided in one embodiment of the present application. For ease of description, Figure 2 omits some structures of the battery 100.

[0048] As shown in Figures 1 and 2, the battery 100 of the present application includes a battery housing 10 and a battery cell 20. The battery housing 10 includes a shell 11, which has an inner cavity 111 therein. The battery cell 20 is housed within the inner cavity 111. The shell 11 is used to prevent external impurities from entering the shell 11, thereby protecting the battery cell 20. At the same time, an electrolyte (not shown) can also be housed within the inner cavity 111 to cooperate with the battery cell 20 to achieve the charge and discharge performance of the battery 100 of the present application.

[0049] The battery cell 20 includes a core 21 and two electrodes 22. Among them, the two electrodes 22 are a positive electrode 221 and a negative electrode 222, and the positive electrode 221 and the negative electrode 222 are respectively conductive with the positive core (not shown in the figure) and the negative core (not shown in the figure) in the core 21. It can be understood that the chemical energy stored in the electrolyte can generate electrical energy under the action of the core 21. The generated electrical energy can be output to the outside through the positive electrode 221 and the negative electrode 222. Thereby realizing the current output function of the battery 100 of the present application.

[0050] At the same time, external current can also be input into the pole core 21 through the positive electrode 221 and the negative electrode 222, and cooperate with the electrolyte to convert electrical energy into chemical energy and store it in the electrolyte, thereby realizing the charging function of the battery 100 of the present application.

[0051] For ease of description, in FIG. 1 and subsequent figures, the plane directions of the housing 11 are respectively set to a first direction 001 and a second direction 002 perpendicular to each other, and a third direction 003 perpendicular to the first direction 001 and the second direction 002 is set.

[0052] Please refer to FIG3 , which shows a partial structural diagram of a battery 100 provided in one embodiment of the present application, and refer to FIG1 and FIG2 . For ease of description, FIG3 omits part of the structure of the battery housing 10 of the present application.

[0053] As shown in Figures 1 to 3, the housing 11 further has two through holes 112, namely a first through hole 1121 and a second through hole 1122. The first through hole 1121 and the second through hole 1122 are both connected to the inner cavity 111, and the first through hole 1121 and the second through hole 1122 are spaced apart from each other.

[0054] The battery housing 10 of the present application further includes two connecting tabs 12, namely a first connecting tab 121 and a second connecting tab 122. One end of the first connecting tab 121 is electrically connected to the positive electrode (not shown) of the battery cell 20, and the other end extends through the first through hole 1121 and out of the housing 11. One end of the second connecting tab 122 is electrically connected to the negative electrode (not shown) of the battery cell 20, and the other end extends through the second through hole 1122 and out of the housing 11.

[0055] It can be understood that the mutual spacing between the first through hole 1121 and the second through hole 1122 can enable the first connecting piece 121 and the second connecting piece 122 to be spaced apart from each other, thereby avoiding the short circuit phenomenon caused by the first connecting piece 121 and the second connecting piece 122 contacting each other, thereby ensuring the safe use of the battery 100 of the present application.

[0056] The external circuit can be electrically connected to the first connecting piece 121 and the second connecting piece 122 extending from the housing 11. Specifically, the positive electrode of the external circuit can be electrically connected to the positive electrode (not shown) of the battery cell 20 via the first connecting piece 121, and the negative electrode of the external circuit can be electrically connected to the negative electrode (not shown) of the battery cell 20 via the second connecting piece 122. This facilitates the charge and discharge functions of the battery 100 of the present application.

[0057] It is understandable that in other embodiments, the first connecting tab 121 may also be electrically connected to the negative electrode of the battery cell 20, and correspondingly, the second connecting tab 122 should be electrically connected to the positive electrode of the battery cell 20. Accordingly, the positive electrode of the external circuit is electrically connected to the second connecting tab 122, and the negative electrode of the external circuit is electrically connected to the first connecting tab 121.

[0058] Please refer to FIG4 , which is a partial cross-sectional schematic diagram of a battery 100 provided in one embodiment of the present application, and FIG5 , which is a partial top view schematic diagram of a battery 100 provided in one embodiment of the present application, and refer to FIG1 and FIG2 in conjunction therewith.

[0059] As shown in Figures 1, 2, 4, and 5, the battery housing 10 of the present application further includes two seals 13, namely a positive electrode seal 131 and a negative electrode seal 132. Both seals 13 are located outside the housing 11, with the positive electrode seal 131 sleeved over the outer edge of the first connecting piece 121 and fixed to the housing 11, and the negative electrode seal 132 sleeved over the outer edge of the second connecting piece 122 and fixed to the housing 11.

[0060] It can be understood that the provision of the positive electrode seal 131 can shield the gap between the first connecting piece 121 and the first through hole 1121, thereby preventing external impurities from entering the inner cavity 111 through the gap between the first connecting piece 121 and the first through hole 1121, and preventing the electrolyte in the inner cavity 111 from flowing out of the inner cavity 111 through the gap between the first connecting piece 121 and the first through hole 1121. This improves the sealing performance of the battery housing 10 of the present application, and improves the sealing performance of the battery 100 of the present application.

[0061] At the same time, the negative electrode seal 132 can shield the gap between the second connecting piece 122 and the second through hole 1122, thereby preventing external impurities from entering the inner cavity 111 through the gap between the second connecting piece 122 and the second through hole 1122, and preventing the electrolyte in the inner cavity 111 from flowing out of the inner cavity 111 through the gap between the second connecting piece 122 and the second through hole 1122. This improves the sealing performance of the battery housing 10 of the present application, and improves the sealing performance of the battery 100 of the present application.

[0062] Therefore, compared with the conventional hard-pack battery that uses a cover with a conductive column to achieve the conduction between the battery cell in the shell and the external circuit, the battery 100 of the present application extends two connecting pieces 12 that are in conduction with the electrodes 22 of the battery cell 20 out of the shell 11, and provides a seal 13 sleeved on the outer edge of the connecting piece 12. While meeting the current transmission function between the battery 100 of the present application and the external circuit, the seal 13 is used to seal the gap between the through hole 112 and the connecting piece 12, thereby improving the sealing performance of the battery 100 of the present application.

[0063] Please refer to FIG6 , which is another partial top view of a battery 100 provided in one embodiment of the present application, and refer to FIG4 and FIG5 in conjunction therewith.

[0064] In one embodiment, as shown in FIG4 to FIG6 , the housing 11 is provided with two protrusions 113 , namely a first protrusion 1131 and a second protrusion 1132 , wherein the first through hole 1121 is provided on the first protrusion 1131 , and the second through hole 1122 is provided on the second protrusion 1132 .

[0065] The positive electrode seal 131 is mounted over the end of the first connecting piece 121 extending beyond the first protrusion 1131. The seal extends toward the first protrusion 1131 and abuts against the end face of the first protrusion 1131 facing away from the battery cell 20. As shown in FIG6 , along the second direction 002 , the distance between the end face of the positive electrode seal 131 facing away from the battery cell 20 and the end face of the first protrusion 1131 facing away from the battery cell 20 is a first dimension L1. The first dimension L1 is greater than or equal to 0.05 mm.

[0066] During actual use, the battery cell 20 within the housing 11 generates heat, which causes the air within the inner cavity 111 to expand. It is understood that when the first dimension L1 is less than 0.05 mm, the positive electrode seal 131 is too thin, which may cause the expanding gas within the inner cavity 111 to break through the positive electrode seal 131 during normal use of the battery 100 of the present application, thereby causing electrolyte leakage, affecting the sealing performance of the battery housing 10 of the present application, and thus affecting the sealing performance of the battery 100.

[0067] Therefore, setting the first dimension L1 of the positive electrode seal 131 to be greater than or equal to 0.05 mm can ensure that the positive electrode seal 131 seals the first through hole 1121 during normal use of the battery 100 of the present application. This ensures that the positive electrode seal 131 improves the sealing performance of the battery 100 of the present application.

[0068] On the other hand, the negative electrode seal 132 is mounted on the end of the first connecting piece 121 extending from the second protrusion 1132, extends toward the second protrusion 1132, and is in contact with the end face of the second protrusion 1132 away from the battery cell 20. As shown in FIG6 , along the second direction 002 , the distance between the end face of the negative electrode seal 132 away from the battery cell 20 and the end face of the second protrusion 1132 away from the battery cell 20 is a first dimension L1. The first dimension L1 is greater than or equal to 0.05 mm.

[0069] During actual use, the battery cells 20 within the housing 11 generate heat, which can cause the air within the inner cavity 111 to expand. It is understood that when the first dimension L1 is less than 0.05 mm, the negative electrode seal 132 is too thin, which may cause the expanding gas within the inner cavity 111 to break through the negative electrode seal 132 during normal use of the battery 100 of the present application, thereby causing electrolyte leakage, affecting the sealing performance of the battery housing 10 of the present application, and thus affecting the sealing performance of the battery 100 of the present application.

[0070] Therefore, setting the first dimension L1 of the negative electrode seal 132 to be greater than or equal to 0.05 mm can ensure that the negative electrode seal 132 seals the second through hole 1122 during normal use of the battery 100 of the present application. This ensures that the negative electrode seal 132 improves the sealing performance of the battery 100 of the present application.

[0071] In one embodiment, referring back to Figures 2-5, housing 11 includes a housing body 114 and a cover 115. A first protrusion 1131 and a second protrusion 1132 are disposed at the junction of housing body 114 and cover 115. Each protrusion 113 includes a first portion 1141 and a second portion 1151. First portion 1141 is located on housing body 114, while second portion 1151 is located on cover 115. First portion 1141 and second portion 1151 are interconnected, forming a corresponding through hole 112 between first portion 1141 and second portion 1151.

[0072] The positive electrode seal 131 further extends along the second direction 002 toward the outer surface of the housing 11 and contacts the outer surface of the housing 11 , so that the positive electrode seal 131 is sleeved around the periphery of the first protrusion 1131 .

[0073] It can be understood that the positive electrode seal 131 is disposed around the periphery of the first protrusion 1131 and is in contact with the outer surface of the housing 11, which can prevent the electrolyte in the housing 11 from flowing out from the first direction 001 through the gap between the first portion 1141 and the second portion 1151. This further improves the sealing effect of the positive electrode seal 131 on the first protrusion 1131, further improves the sealing performance of the battery housing 10 of the present application, and further improves the sealing performance of the battery 100 of the present application.

[0074] 5 and 6 , the outer edge of the positive electrode seal 131 is sleeved on the outer surface of the first bump 1131 , and the distance between the outer edge of the positive electrode seal 131 and the outer surface contour of the first bump 1131 is a first width W1 , which is greater than or equal to 0.05 mm.

[0075] Since a gap may exist between the first protrusion 1131 and the positive electrode seal 131 in the second direction 002, it is understandable that when the first width W1 of the positive electrode seal 131 is less than 0.05 mm, during normal operation of the battery 100 of the present application, the gas expanding in the inner cavity 111 may act on the sidewall of the positive electrode seal 131 along the gap between the first protrusion 1131 and the positive electrode seal 131, thereby breaking through the sidewall of the positive electrode seal 131 and causing leakage of the electrolyte in the inner cavity 111, thereby affecting the safety and sealing performance of the battery 100 of the present application.

[0076] The negative electrode seal 132 further extends along the second direction 002 toward the outer surface of the shell 11 and contacts the outer surface of the shell 11 , so that the negative electrode seal 132 is sleeved around the outer periphery of the second protrusion 1132 .

[0077] It can be understood that the negative electrode seal 132 is disposed around the periphery of the second protrusion 1132 and is in contact with the outer surface of the housing 11, which can prevent the electrolyte in the housing 11 from flowing out from the first direction 001 through the gap between the first portion 1141 and the second portion 1151. This further improves the sealing effect of the negative electrode seal 132 on the second protrusion 1132, further improves the sealing performance of the battery housing 10 of the present application, and further improves the sealing performance of the battery 100 of the present application.

[0078] 5 and 6 , the outer edge of the negative electrode seal 132 is sleeved on the outer surface of the second protrusion 1132 , and the distance between the outer edge of the negative electrode seal 132 and the outer surface contour of the second protrusion 1132 is a first width W1 , which is greater than or equal to 0.05 mm.

[0079] Since a gap may exist between the second protrusion 1132 and the negative electrode seal 132 in the second direction 002, it is understandable that when the first width W1 of the negative electrode seal 132 is less than 0.05 mm, during normal operation of the battery 100 of the present application, the gas expanding in the inner cavity 111 may act on the sidewall of the negative electrode seal 132 along the gap between the second protrusion 1132 and the negative electrode seal 132, thereby breaking through the sidewall of the negative electrode seal 132 and causing leakage of the electrolyte in the inner cavity 111, thereby affecting the safety and sealing performance of the battery 100 of the present application.

[0080] In one embodiment, as shown in Figures 5 and 6 , along the second direction 002, the length of the first through hole 1121 is a second dimension L2. The second dimension L2 of the first through hole 1121 is greater than or equal to 0.275 mm.

[0081] It is understood that when the second dimension L2 of the first through hole 1121 is less than 0.275 mm, the protruding length of the first bump 1131 is reduced, resulting in a reduction in the area of ​​the first connecting piece 121 corresponding to the first bump 1131. This may cause the first connecting piece 121 to bend along the third direction 003, which may affect the positional definition of the first connecting piece 121. At the same time, when the second dimension L2 is too small, the protruding length of the first bump 1131 is too short, which is not conducive to the fixation of the positive electrode seal 131.

[0082] Therefore, setting the second dimension L2 of the first through hole 1121 to be greater than or equal to 0.275 mm can ensure the position of the first connecting piece 121 while ensuring the protrusion height of the first protrusion 1131 to facilitate the fixation of the positive electrode seal 131.

[0083] On the other hand, along the second direction 002, the length of the second through hole 1122 is a second dimension L2. The second dimension L2 of the second through hole 1122 is greater than or equal to 0.275 mm.

[0084] It is understood that when the second dimension L2 of the second through hole 1122 is less than 0.275 mm, the protruding length of the second protrusion 1132 is reduced, resulting in a reduction in the area of ​​the second connecting piece 122 corresponding to the second protrusion 1132. This may cause the second connecting piece 122 to bend along the third direction 003, which may affect the position of the second connecting piece 122. At the same time, when the second dimension L2 is too small, the protruding length of the second protrusion 1132 is too short, which is not conducive to the fixation of the negative electrode seal 132.

[0085] Therefore, setting the second dimension L2 of the second through hole 1122 to be greater than or equal to 0.275 mm can ensure the position of the second connecting piece 122 while ensuring the protrusion height of the second protrusion 1132 to facilitate the fixation of the negative electrode seal 132 .

[0086] In one embodiment, as shown in Figures 3-5, the battery housing 10 of the present application also includes a second seal 14, which is located in the first through hole 1121, between the first connecting piece 121 and the first through hole 1121, and adheres to the surface of the first connecting piece 121.

[0087] It is understandable that the provision of the second sealing member 14 can also reduce the gap between the first connecting piece 121 and the first through hole 1121, thereby shielding the first through hole 1121 and reducing the possibility of external impurities entering the housing 11 through the first through hole 1121. This further improves the sealing performance of the battery housing 10 of the present application and improves the sealing performance of the battery 100 of the present application.

[0088] In one embodiment, as shown in Figures 3-5, the second sealing member 14 is filled between the first connecting piece 121 and the first through hole 1121 to prevent external impurities from entering the housing 11 through the first through hole 1121 while preventing the electrolyte in the housing 11 from flowing out of the housing 11 through the first through hole 1121. Thus, the second sealing member 14 can cooperate with the first connecting piece 121 to seal the first through hole 1121. This improves the sealing performance of the battery housing 10 of the present application, and also improves the sealing performance of the battery 100 of the present application.

[0089] In one embodiment, as shown in Figures 3 to 5 , along the second direction 002 , opposite ends of the second sealing member 14 may further extend into and out of the housing 11 , respectively, to further enhance the sealing effect of the second sealing member 14 on the first through hole 1121 , thereby further enhancing the sealing performance of the battery 100 of the present application.

[0090] In one embodiment, as shown in Figures 5 and 6 , the length of the second sealing member 14 extending from the first through hole 1121 along the second direction 002 is a third dimension L3, and the third dimension L3 is greater than or equal to 0.1 mm. Because the second sealing member 14 can melt into a fluid at high temperatures, it is understood that setting the third dimension L3 greater than or equal to 0.1 mm can prevent the second sealing member 14 located outside the housing 11 from still being able to seal the first through hole 1121 when the second sealing member 14 near the battery cell 20 is in a molten state.

[0091] In one embodiment, as shown in FIG. 3 to FIG. 5 , the second sealing member 14 is further located in the second through hole 1122 , between the second connecting piece 122 and the second through hole 1122 , and adheres to the surface of the second connecting piece 122 .

[0092] It is understandable that the provision of the second sealing member 14 can also reduce the gap between the second connecting piece 122 and the second through hole 1122, thereby shielding the second through hole 1122 and reducing the possibility of external impurities entering the housing 11 through the second through hole 1122. This further improves the sealing performance of the battery housing 10 of the present application and the sealing performance of the battery 100 of the present application.

[0093] In one embodiment, as shown in Figures 3-5, the second sealing member 14 is also filled between the second connecting piece 122 and the second through hole 1122, so as to prevent external impurities from entering the housing 11 through the second through hole 1122 while preventing the electrolyte in the housing 11 from flowing out of the housing 11 through the second through hole 1122. As a result, the second sealing member 14 can cooperate with the second connecting piece 122 to seal the second through hole 1122. This improves the sealing performance of the battery housing 10 of the present application and the sealing performance of the battery 100 of the present application.

[0094] In one embodiment, as shown in Figures 3-5, along the second direction 002, the opposite ends of the second sealing member 14 can further extend into and out of the housing 11, respectively, to further enhance the sealing effect of the second sealing member 14 on the second through hole 1122. This further enhances the sealing performance of the battery housing 10 of the present application, and enhances the sealing performance of the battery 100 of the present application.

[0095] In one embodiment, as shown in Figures 5 and 6 , the length of the second sealing member 14 extending from the second through hole 1122 along the second direction 002 is a third dimension L3, and the third dimension L3 is greater than or equal to 0.1 mm. Because the second sealing member 14 can melt into a fluid at high temperatures, it is understood that setting the third dimension L3 greater than or equal to 0.1 mm can prevent the second sealing member 14 located outside the housing 11 from still being able to seal the second through hole 1122 when the second sealing member 14 near the battery cell 20 is in a molten state.

[0096] In one embodiment, the housing 11 is made of a metal material, and the second sealing member 14 has insulating properties. Exemplarily, the second sealing member 14 is made of an activated material, exemplarily polypropylene. It is understood that in other embodiments, the second sealing member 14 may also be made of a liquid or gel-like adhesive material that is cured. This application does not impose any particular limitation on this.

[0097] In one embodiment, the seal 13 may also be made of activated material.

[0098] In one embodiment, the housing body 114 is made of a metal material. For example, the housing body 114 is made of an iron alloy, an aluminum alloy, or the like. It is understood that, compared to the aluminum-plastic film structure used in the prior art for soft-pack batteries, the battery 100 of the present application uses a metal material to make the housing body 114, thereby improving the strength of the housing 11, thereby improving the structural strength of the battery housing 10 of the present application, and improving the structural strength of the battery 100 of the present application.

[0099] In one embodiment, the thickness of the housing body 114 is between 20 μm and 500 μm. It is understood that setting the housing body 114 to have a thickness between 20 μm and 500 μm can ensure the strength of the housing body 114 while preventing the housing body 114 from being too thick and occupying too much space in the battery cell 20, thereby affecting the capacity of the battery 100 of the present application.

[0100] In one embodiment, the cover 115 is made of a metal material. For example, the cover 115 is made of an iron alloy, an aluminum alloy, or the like. It is understood that, compared to the aluminum-plastic film structure used in conventional soft-pack batteries, the battery 100 of the present application uses a metal material to make the cover 115, thereby improving the strength of the housing 11 and thus improving the structural strength of the battery 100 of the present application.

[0101] In one embodiment, the thickness of the cover 115 is between 20 μm and 500 μm. It is understood that setting the cover 115 to have a thickness between 20 μm and 500 μm can ensure the strength of the cover 115 while preventing the cover 115 from being too thick and occupying too much space in the battery cell 20, thereby affecting the capacity of the battery 100 of the present application.

[0102] In one embodiment, the housing 11 is made of an insulating material, and accordingly, the second seal 14 may not be made of a material having insulating properties. In another embodiment, when the housing 11 is made of an insulating material, the battery 100 of the present application may not have the second seal 14 provided on the connecting piece 12.

[0103] Please refer to FIG. 7 for another exploded schematic diagram of the battery 100 provided in one embodiment of the present application, and please refer to FIG. 8 for another structural schematic diagram of the battery 100 provided in one embodiment of the present application.

[0104] As shown in Figures 7 and 8, the housing 11 is further provided with a recessed portion 116, which extends along the second direction 002 toward the battery cell 20. The first protrusion 1131 and the second protrusion 1132 are both disposed within the recessed portion 116. It is understood that the provision of the recessed portion 116 reduces the size of the first protrusion 1131 and the second protrusion 1132 in the second direction 002, thereby increasing the space occupied by the battery cell 20 and thereby improving the capacity of the battery 100 of the present application.

[0105] In one embodiment, referring back to FIG2 , the housing body 114 includes a bottom plate 1142 and side plates 1143 , with the side plates 1143 surrounding the edges of the bottom plate 1142 . The ends of the side plates 1143 away from the bottom plate 1142 are in contact with the cover 115 to form the inner cavity 111 .

[0106] Please refer to FIG9 , which shows another structural diagram of a battery 100 provided in an embodiment of the present application, and refer to FIG2 and FIG3 in conjunction therewith.

[0107] As shown in FIG. 2 , FIG. 3 and FIG. 9 , the shell body 114 further includes an extension structure 114 a . The extension structure 114 a is disposed at an end of the side plate 1143 away from the bottom plate 1142 and extends outward in a direction away from the battery cell 20 .

[0108] The extension structure 114a and the cover 115 can cooperate with each other and be fixedly connected, thereby achieving a fixed connection between the housing body 114 and the cover 115. It can be understood that the provision of the extension structure 114a can increase the contact area between the housing body 114 and the cover 115 while ensuring that the overall thickness of the housing body 114 and the cover 115 remains unchanged, thereby facilitating the connection between the housing body 114 and the cover 115.

[0109] Specifically, in this embodiment, the connection between the housing body 114 and the cover body 115 can be welded, and the epitaxial structure 114a and the cover body 115 are welded together along the first direction 001 and the second direction 002. The welded portion does not include the area where the first through hole 1121 and the second through hole 1122 are provided.

[0110] Therefore, compared to the higher assembly precision requirements of the cover and shell required by the prior art hard-pack batteries, the connection method between the shell body 114 and the cover 115 provided in the battery 100 of the present application can reduce the precision requirements, thereby reducing the manufacturing cost of the battery 100 of the present application.

[0111] Meanwhile, as shown in Figures 3 and 9 , the connection between the cover 115 and the housing body 114 is welded in the present application. In actual manufacturing, when the epitaxial structure 114a and the cover 115 are welded together, the unwelded portion can be trimmed to reduce the overall size of the battery 100 of the present application. During the trimming process, the areas where the first through hole 1121 and the second through hole 1122 are located are avoided to form the first bump 1131 and the second bump 1132, respectively.

[0112] It is understandable that in other embodiments, the connection method between the shell body 114 and the cover body 115 in the battery 100 of the present application can also be other, and the present application does not specifically limit this.

[0113] In other embodiments, the cover 115 may also include a bottom plate and side plates, which are not particularly limited in this application.

[0114] In one embodiment, referring back to Figures 5 and 6 , along the first direction 001, the spacing between the sidewall of the bump 113 and the weld where the first portion 1141 and the second portion 1151 are welded together is a second width W2. The second width W2 is greater than or equal to 0.05 mm. It will be appreciated that the second width W2 prevents damage to the weld during the cutting process, thereby ensuring a good weld between the first portion 1141 and the second portion 1151.

[0115] In one embodiment, as shown in Figures 5 and 6 , along the second direction 002 , the distance between the inner wall of the housing 11 and the weld where the housing body 114 and the cover 115 are welded together is a fourth dimension L4. The fourth dimension L4 is greater than or equal to 0.05 mm. It will be appreciated that the fourth dimension L4 can prevent damage to the weld during cutting, thereby ensuring a good weld between the housing body 114 and the cover 115.

[0116] In one embodiment, as shown in Figures 5 and 6 , the second sealing member 14 does not completely fill the gap between the through hole 112 and the connecting piece 12. Furthermore, along the first direction 001, the spacing between the sidewall of the second sealing member 14 and the weld where the first portion 1141 and the second portion 1151 are welded together is a third width W3. W3 is greater than or equal to 0.1 mm. Since welding generates high temperatures, and the second sealing member 14 melts in such high temperatures, it is understood that the third width W3 ensures that the relative position of the second sealing member 14 is defined.

[0117] In one embodiment, as shown in FIG9 , the housing body 114 is further provided with an injection hole 15 , which is connected to the housing 11 , so that electrolyte can be injected into the housing 11 through the injection hole 15 , thereby improving the injection efficiency of the electrolyte.

[0118] Therefore, compared with the electrolyte injection method used in soft-pack batteries, the battery 100 of the present application injects electrolyte by providing an injection hole 15, which can reduce the loss of electrolyte during electrolyte injection, thereby achieving control of the electrolyte flow in the shell 11.

[0119] Please refer to FIG. 10 , which is another structural diagram of a battery 100 provided in an embodiment of the present application.

[0120] As shown in FIG10 , the battery housing 10 of the present application further includes a fixing member 16 , wherein a plurality of fixing members 16 are provided and are disposed on the outer edge of the housing 11 to facilitate fixing the battery 100 in the battery tray.

[0121] Please refer to FIG11 , which is a schematic structural diagram of a battery cell 20 provided in an embodiment of the present application, and refer to FIG2 and FIG5 in conjunction therewith.

[0122] As shown in Figures 2, 5 and 11, the battery cell 20 of the present application includes a plurality of electrode cores 21 provided with electrode tabs (not shown in the figures), wherein the plurality of electrode cores 21 include a plurality of positive electrode cores 21a and a plurality of negative electrode cores 21b. Each positive electrode core 21a corresponds to a positive electrode tab (not shown in the figures), and each negative electrode core 21b corresponds to a negative electrode tab (not shown in the figures). The plurality of positive electrode tabs are gathered together and welded together to form a positive electrode 221, and the plurality of negative electrode tabs are gathered together and welded together to form a negative electrode 222. The positive electrode cores 21a and the negative electrode cores 21b are alternately stacked along the third direction 003.

[0123] The charge and discharge performance of the battery 100 primarily stems from the conversion between electrical and chemical energy, which is primarily achieved through the positive electrode core 21a, the negative electrode core 21b, and the electrolyte (not shown). When the battery 100 is connected to an external circuit, the positive electrode core 21a undergoes an oxidation reaction with the electrolyte, generating electrons, while the negative electrode core 21b undergoes a reduction reaction with the electrolyte, losing electrons. This creates a potential difference between the positive and negative electrode cores 21a, 21b, thereby achieving the conversion between chemical and electrical energy.

[0124] When the external circuit inputs current to the positive electrode core 21a and the negative electrode core 21b, due to the potential difference between the positive electrode core 21a and the negative electrode core 21b, the positive electrode core 21a and the negative electrode core 21b will react chemically with the electrolyte, thereby converting electrical energy into chemical energy and storing it in the electrolyte.

[0125] In order to make the battery 100 hold more electricity, it is necessary to increase the contact area between the positive electrode core 21a, the negative electrode core 21b and the electrolyte. By setting multiple positive electrode cores 21a and multiple negative electrode cores 21b, and arranging multiple positive electrode cores 21a and multiple negative electrode cores 21b alternately, the battery 100 of the present application can have a larger capacity.

[0126] At the same time, the electrical energy generated by the interaction between the positive electrode core 21a and the negative electrode core 21b can be output to the external circuit through each positive and negative tab, thereby achieving the discharge function of the battery 100 of the present application. On the other hand, the current input by the external circuit can also be transmitted to the battery core 20 through each positive and negative tab, thereby achieving the charging function of the battery 100 of the present application.

[0127] It can be understood that in this embodiment, as shown in FIG11 , multiple positive electrode cores 21 a and multiple negative electrode cores 21 b are alternately formed to form a battery cell 20 , thereby making the battery 100 of the present application a blade battery.

[0128] In another embodiment, as shown in FIG12 , a plurality of positive electrode cores 21 a can be connected as one, and a plurality of negative electrode cores 21 b can also be connected as one, so that the positive electrode core 21 a and the negative electrode core 21 b are adhered to each other and wound to form a battery cell 20 , thereby making the battery 100 of the present application a roll battery.

[0129] It is understood that in this embodiment, the materials of the positive electrode core 21a and the negative electrode core 21b provided by the battery 100 of the present application are different, so that the battery 100 of the present application can achieve the charge and discharge function of the battery 100 of the present application through the chemical reaction between the materials of the positive electrode core 21a and the negative electrode core 21b and the electrolyte. Exemplarily, the battery 100 of the present application is a lithium-ion battery. In another embodiment, the materials of the positive electrode core 21a and the negative electrode core 21b provided by the battery 100 of the present application can also be the same. Exemplarily, the battery 100 of the present application can be a sodium-ion battery.

[0130] In one embodiment, as shown in Figures 11 and 12, the battery cell 20 further includes a plurality of insulating films 23, which are disposed between the positive electrode core 21a and the negative electrode core 21b and adhere to the positive electrode core 21a and the negative electrode core 21b, respectively. This is to achieve mutual insulation between the positive electrode core 21a and the negative electrode core 21b, preventing problems such as short circuits and leakage in the battery cell 20 due to conduction between the positive electrode core 21a and the negative electrode core 21b. This ensures the safety of the battery 100 of the present application.

[0131] It should be understood that the terms "first," "second," etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of this application, "plurality" means two or more, unless otherwise specifically defined.

[0132] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0133] It should be understood that the application of this application is not limited to the above examples. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the scope of protection of the claims appended to this application. Those skilled in the art will understand that implementing all or part of the processes of the above embodiments and making equivalent changes in accordance with the claims of this invention still fall within the scope of this invention.

Claims

1. A battery housing (10), characterized in that: include A housing (11), wherein the housing (11) is provided with an inner cavity (111) and two through holes (112) communicating with the inner cavity (111); two connecting pieces (12); and two seals (13); One end of the first connecting piece (121) is located in the inner cavity (111), and the other end passes through the first through hole (1121) and extends out of the shell (11); one end of the second connecting piece (122) is located in the inner cavity (111), and the other end passes through the second through hole (1122) and extends out of the shell (11); The two sealing members (13) are both located outside the shell (11), and each of the sealing members (13) is respectively sleeved on the outside of one of the connecting pieces (12). The outer edge of each of the sealing members (13) is also respectively fixed to the shell (11), and each of the sealing members (13) is used to cover the gap between one of the connecting pieces (12) and the through hole (112).

2. The battery housing (10) according to claim 1, characterized in that: The housing (11) is provided with two protruding blocks (113); the two through holes (112) are respectively provided on the two protruding blocks (113); and the sealing member (13) is sleeved on a portion of the connecting piece (12) that protrudes from the protruding blocks (113) by at least 0.05 mm.

3. The battery housing (10) according to claim 2, characterized in that: The shell (11) comprises a shell body (114) and a cover body (115); the two protrusions (113) are arranged at the connection between the shell body (114) and the cover body (115); each of the protrusions (113) comprises a first part (1141) located on the shell body (114) and a second part (1151) located on the cover body (115); and the sealing member (13) is also used to cover the gap between the first part (1141) and the second part (1151).

4. The battery housing (10) according to claim 2 or 3, characterized in that: The outer edge of the sealing member (13) is sleeved on the outer surface of the protrusion (113), and the distance between the outer edge of the sealing member (13) and the outer surface contour of the protrusion (113) is greater than or equal to 0.05 mm.

5. The battery housing (10) according to any one of claims 1 to 4, characterized in that: Along the length direction of the connecting sheet (12), the length of the through hole (112) is greater than or equal to 0.275 mm.

6. The battery housing (10) according to any one of claims 1 to 5, characterized in that: The battery housing (10) further comprises a second sealing member (14), wherein the second sealing member (14) is at least partially located in the through hole (112) and between the connecting sheet (12) and the through hole (112).

7. The battery housing (10) according to claim 6, characterized in that: The second sealing member (14) is filled between the connecting sheet (12) and the through hole (112), and the second sealing member (14) is also used to seal the gap between the through hole (112) and the connecting sheet (12).

8. The battery housing (10) according to claim 6, characterized in that: The second sealing member (14) partially protrudes from the housing (11), and along the length direction of the connecting piece (12), the length of the second sealing member (14) protruding from the housing (11) is greater than or equal to 0.1 mm.

9. The battery housing (10) according to claim 6, characterized in that: The housing (11) is made of metal material, and the second sealing member (14) has insulating properties.

10. The battery housing (10) according to any one of claims 1 to 9, characterized in that: The housing (11) further comprises a recessed portion (116), and the ends of the two connecting pieces (12) extending out of the housing (11) are at least partially located in the recessed portion (116).

11. The battery housing (10) according to any one of claims 3 to 10, characterized in that: The shell body (114) and the cover body (115) are made of metal material.

12. The battery housing (10) according to any one of claims 3 to 11, characterized in that: The shell body (114) includes a bottom plate (1142) and a side plate (1143), wherein the side plate (1143) surrounds the edge of the bottom plate (1142), and the end of the side plate (1143) away from the bottom plate (1142) is in contact with the cover body (115) to form the inner cavity (111).

13. The battery housing (10) according to any one of claims 3 to 12, characterized in that: The shell body (114) is also provided with a liquid injection hole (15), and the liquid injection hole (15) is connected to the shell (11).

14. A battery (100), characterized in that: The invention comprises a battery cell (20) and a battery casing (10) according to any one of claims 1 to 13, wherein the battery cell (20) is accommodated in an inner cavity (111) of the battery casing (10), and two connecting pieces (12) of the battery casing (10) are respectively connected to a positive electrode (221) and a negative electrode (222) of the battery cell (20).

15. The battery (100) according to claim 14, characterized in that: The battery casing (10) further comprises a plurality of fixing members (16), wherein the fixing members (16) are arranged on the outer edge of the casing (11).

16. A battery assembly, characterized in that: It comprises a battery tray and a battery (100) according to claim 14 or 15, wherein the battery is accommodated in the battery tray.

17. An electrical equipment, characterized in that: Comprising a battery assembly according to claim 16.

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