Battery shell, battery, battery assembly and electric equipment

Abstract

The invention relates to a battery shell, a battery, a battery assembly and electric equipment. The battery shell comprises a shell body, two connecting pieces and two sealing pieces, wherein the shell body is provided with an inner cavity and two through holes communicated with the inner cavity; one end of one connecting piece is located in the inner cavity, the other end penetrates through one through hole to extend out of the shell, one end of the other connecting piece is located in the inner cavity, and the other end penetrates through the other through hole to extend out of the shell; the two sealing pieces are located outside the shell, each sealing piece is arranged on the outer side of one connecting piece in a sleeving mode, the outer edge of each sealing piece is further fixed to the shell, and each sealing piece is used for shielding a gap between one connecting piece and the through hole. According to the battery shell, the two connecting pieces extending out of the shell are arranged, and the sealing pieces arranged on the outer edges of the connecting pieces in a sleeving mode are arranged, so that the gaps between the through holes and the connecting pieces are sealed through the sealing pieces, and the sealing performance of the battery shell is improved.

Description

Technical Field

[0001] 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

[0002] Batteries in the prior art can generally be divided into soft-pack batteries and hard-pack batteries. Soft-pack batteries generally use aluminum-plastic films to carry the battery cells, but the structural strength of the aluminum-plastic film is relatively weak. Increasing the thickness of the aluminum-plastic film to improve the strength will lead to an increase in the cost of the battery.

[0003] For hard pack batteries, a metal shell is usually used to carry the battery cell, and a cover plate with conductive columns is used to connect the battery cell to the external environment. However, in the actual processing process, a high assembly accuracy between the cover plate and the metal shell is required to ensure the sealing of the battery, which leads to an increase in costs. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present 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. The specific technical solutions include the following:

[0005] In a first aspect, an embodiment of the present application provides a battery housing, comprising a housing, two connecting sheets and two sealing members, wherein the housing is provided with an inner cavity and two through holes communicating with the inner cavity;

[0006] One end of a connecting piece is located in the inner cavity, and the other end thereof passes through a through hole and extends out of the shell; one end of another connecting piece is located in the inner cavity, and the other end thereof passes through another through hole and extends out of the shell;

[0007] The two seals are both located outside the shell, each seal is sleeved on the outside of a connecting piece, the outer edge of each seal is also fixed to the shell, and each seal is used to cover the gap between a connecting piece and the through hole.

[0008] The battery casing of the present application is provided with two connecting pieces extending out of the shell, and a sealing member sleeved on the outer edge of the connecting piece is provided, so that the sealing member is used to seal the through hole and the gap between the connecting pieces, thereby improving the sealing performance of the battery casing 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, 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, and the seal is also used to shield 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 further includes a second sealing member, wherein the second sealing member is at least partially located in the through hole and between the connecting sheet and the through hole.

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

[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 shell is made of metal material, and the second sealing component has insulating properties.

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

[0018] In a second aspect, an embodiment of the present application provides a battery, including a battery cell and a battery casing, wherein the battery cell is accommodated in an inner cavity of the battery casing, and two connecting pieces of the battery casing are respectively connected to a positive electrode and a negative electrode of the battery cell.

[0019] In a third aspect, an embodiment of the present application provides a battery assembly, including a battery tray and a battery, wherein the battery is accommodated in the battery tray.

[0020] In a fourth aspect, an embodiment of the present application provides an electrical device including a battery assembly.

[0021] 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 casing provided in the first aspect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a battery provided in one embodiment of the present application;

[0023] Figure 2 This is a schematic diagram of an exploded view of a battery provided in one embodiment of the present application;

[0024] Figure 3 A schematic diagram of a partial structure of a battery provided in one embodiment of the present application;

[0025] Figure 4 A partial cross-sectional schematic diagram of a battery provided in one embodiment of the present application;

[0026] Figure 5 A partial top view of a battery provided in one embodiment of the present application;

[0027] Figure 6 Another partial top view of a battery provided in one embodiment of the present application;

[0028] Figure 7 Another exploded schematic diagram of a battery provided in one embodiment of the present application;

[0029] Figure 8 Another structural schematic diagram of a battery provided in one embodiment of the present application;

[0030] Fig. 9 This is another structural schematic diagram of a battery provided in an embodiment of the present application;

[0031] Fig.10 This is another structural schematic diagram of a battery provided in one embodiment of the present application;

[0032] Fig.11 A schematic diagram of the structure of a battery cell provided in one embodiment of the present application;

[0033] Fig.12 Another structural schematic diagram of a battery cell provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0035] 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 for 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, unless otherwise specified, include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "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 to the present application.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including", "may include", "include", or "may include" used in this application indicate the existence of the corresponding functions, operations, elements, etc. disclosed, and do not limit one or more other functions, operations, elements, etc. In addition, the terms "including" or "include" indicate the existence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions.

[0037] 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 belongs. 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.

[0038] The electrical equipment provided in the present application includes a battery assembly. Exemplarily, the electrical equipment is a vehicle, and the vehicle includes a body and a battery assembly, and the battery assembly is housed in the 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 a battery and a battery tray, and a plurality of batteries connected in parallel and / or in series are housed in the battery tray to protect the battery. The plurality of 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.

[0039] It is understandable that in other embodiments, the electrical equipment of the present application may be other, and the present application does not impose any particular limitation on this.

[0040] See also Figure 1 The structural diagram of the battery 100 provided in one embodiment of the present application is shown in FIG. Figure 2 FIG. 1 is a schematic diagram of an exploded view of a battery 100 provided in one embodiment of the present application. For ease of description, Figure 2 Part of the structure of the battery 100 is omitted.

[0041] like Figure 1 and Figure 2 As shown, 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, and an inner cavity 111 is provided in the shell 11. The battery cell 20 is accommodated in 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, the electrolyte (not shown in the figure) can also be accommodated in 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.

[0042] The battery cell 20 includes a core 21 and two electrodes 22. The two electrodes 22 are respectively a positive electrode 221 and a negative electrode 222, and the positive electrode 221 and the negative electrode 222 are respectively connected to 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.

[0043] 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.

[0044] For ease of description, Figure 1In the 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.

[0045] See also Figure 3 The partial structural diagram of the battery 100 provided in one embodiment of the present application is shown in FIG. Figure 1 and Figure 2 . For ease of description, Figure 3 Part of the structure of the battery housing 10 of the present application is omitted.

[0046] like Figure 1-Figure 3 As shown, the housing 11 is further provided with 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.

[0047] The battery housing 10 of the present application further includes two connecting pieces 12, namely a first connecting piece 121 and a second connecting piece 122. One end of the first connecting piece 121 is connected to the positive electrode (not shown in the figure) of the battery cell 20, and the other end thereof extends out of the housing 11 through the first through hole 1121, and one end of the second connecting piece 122 is connected to the negative electrode (not shown in the figure) of the battery cell 20, and the other end thereof extends out of the housing 11 through the second through hole 1122.

[0048] It can be understood that the mutual spacing between the first through hole 1121 and the second through hole 1122 can make the first connecting piece 121 and the second connecting piece 122 spaced apart from each other, thereby avoiding the short circuit 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.

[0049] The external circuit can be connected to the first connecting piece 121 and the second connecting piece 122 extending out of the housing 11. Specifically, the positive electrode of the external circuit can be connected to the positive electrode (not shown in the figure) of the battery cell 20 through the first connecting piece 121, and the negative electrode of the external circuit can be connected to the negative electrode (not shown in the figure) of the battery cell 20 through the second connecting piece 122. This facilitates the charging and discharging functions of the battery 100 of the present application.

[0050] It is understandable that in other embodiments, the first connecting sheet 121 may also be connected to the negative electrode of the battery cell 20, and correspondingly, the second connecting sheet 122 should be connected to the positive electrode of the battery cell 20. Correspondingly, the positive electrode of the external circuit is connected to the second connecting sheet 122, and the negative electrode of the external circuit is connected to the first connecting sheet 121.

[0051] See also Figure 4The partial cross-sectional diagram of the battery 100 provided in one embodiment of the present application is shown, and please refer to Figure 5 The schematic diagram of a partial top view of a battery 100 provided in one embodiment of the present application is shown in FIG. Figure 1 and Figure 2 .

[0052] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, 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. The two seals 13 are both located outside the housing 11, and the positive electrode seal 131 is sleeved on the outer edge of the first connecting piece 121 and fixed to the housing 11, and the negative electrode seal 132 is sleeved on the outer edge of the second connecting piece 122 and fixed to the housing 11.

[0053] It can be understood that the arrangement 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.

[0054] At the same time, the negative electrode seal 132 is provided to cover 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.

[0055] Therefore, compared with the hard-pack battery in the prior art that uses a cover with a conductive column to realize 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 sets a seal 13 sleeved on the outer edge of the connecting piece 12, so as to meet the current transmission function between the battery 100 of the present application and the external circuit, and at the same time, use the seal 13 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.

[0056] See also Figure 6 Another partial top view of a battery 100 provided in one embodiment of the present application is shown in FIG. Figure 4 and Figure 5 .

[0057] In one embodiment, if Figure 4-Figure 6 As shown, the housing 11 is provided with two protrusions 113 , namely a first protrusion 1131 and a second protrusion 1132 . 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 .

[0058] The positive electrode seal 131 is sleeved on the end of the first connecting piece 121 extending out of the first protrusion 1131, extends toward the first protrusion 1131, and fits with the end surface of the first protrusion 1131 away from the battery cell 20. Figure 6 As shown, along the second direction 002, the distance between the end surface of the positive electrode seal 131 away from the battery cell 20 and the end surface of the first protrusion 1131 away from the battery cell 20 is a first dimension L1. The first dimension L1 is greater than or equal to 0.05 mm.

[0059] During actual use, the battery cell 20 in the housing 11 generates heat, which causes the air in the inner cavity 111 to expand. It is understandable that when the first dimension L1 is less than 0.05 mm, the positive electrode seal 131 is too thin, which may cause the gas expanding in 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 affecting the sealing performance of the battery 100.

[0060] 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 can seal the first through hole 1121 during normal use of the battery 100 of the present application, thereby ensuring the positive electrode seal 131 improves the sealing performance of the battery 100 of the present application.

[0061] On the other hand, the negative electrode seal 132 is sleeved on the end of the first connecting piece 121 extending out of the second protrusion 1132, extends toward the second protrusion 1132, and fits with the end surface of the second protrusion 1132 away from the battery cell 20. Figure 6 As shown, along the second direction 002, the distance between the end surface of the negative electrode seal 132 away from the battery cell 20 and the end surface 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.

[0062] During actual use, the battery cell 20 in the housing 11 generates heat, which causes the air in the inner cavity 111 to expand. It is understandable that when the first dimension L1 is less than 0.05 mm, the negative electrode seal 132 is too thin, which may cause the gas expanding in 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 affecting the sealing performance of the battery 100 of the present application.

[0063] 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 can seal the second through hole 1122 during normal use of the battery 100 of the present application, thereby ensuring the improvement effect of the negative electrode seal 132 on the sealing performance of the battery 100 of the present application.

[0064] In one embodiment, please refer to Figure 2-Figure 5 The housing 11 includes a housing body 114 and a cover 115, and the first protrusion 1131 and the second protrusion 1132 are both arranged at the connection between the housing body 114 and the cover 115. Each protrusion 113 includes a first portion 1141 and a second portion 1151. The first portion 1141 is located on the housing body 114, and the second portion 1151 is located on the cover 115. The first portion 1141 and the second portion 1151 are connected to each other, and a corresponding through hole 112 is formed between the first portion 1141 and the second portion 1151.

[0065] The positive electrode seal 131 also 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 positive electrode seal 131 is sleeved around the periphery of the first protrusion 1131 .

[0066] It can be understood that the positive electrode seal 131 is arranged around the periphery of the first protrusion 1131, and the positive electrode seal 131 is in contact with the outer surface of the shell 11, which can prevent the electrolyte in the shell 11 from flowing out from the first direction 001 through the gap between the first part 1141 and the second part 1151. The sealing effect of the positive electrode seal 131 on the first protrusion 1131 is further improved, and the sealing performance of the battery shell 10 of the present application is further improved. The sealing performance of the battery 100 of the present application is further improved.

[0067] Among them, Figure 5 and Figure 6 As shown, the outer edge of the positive electrode seal 131 is sleeved on the outer surface of the first protrusion 1131, and the distance between the outer edge of the positive electrode seal 131 and the outer surface contour of the first protrusion 1131 is a first width W1, which is greater than or equal to 0.05 mm.

[0068] Since there may be a gap 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 the normal operation of the battery 100 of the present application, the gas expanding in the inner cavity 111 may act on the side wall of the positive electrode seal 131 along the gap between the first protrusion 1131 and the positive electrode seal 131, thereby breaking through the side wall of the positive electrode seal 131, causing the electrolyte in the inner cavity 111 to leak, thereby affecting the safety and sealing performance of the battery 100 of the present application.

[0069] The negative electrode seal 132 also 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 on the periphery of the second protrusion 1132 .

[0070] It can be understood that the negative electrode seal 132 is arranged around the periphery of the second protrusion 1132, and the negative electrode seal 132 is in contact with the outer surface of the shell 11, which can prevent the electrolyte in the shell 11 from flowing out from the first direction 001 through the gap between the first part 1141 and the second part 1151. The sealing effect of the negative electrode seal 132 on the second protrusion 1132 is further improved, and the sealing performance of the battery shell 10 of the present application is further improved. The sealing performance of the battery 100 of the present application is further improved.

[0071] Among them, Figure 5 and Figure 6 As shown, 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, and the first width W1 is greater than or equal to 0.05 mm.

[0072] Since there may be a gap 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 the normal operation of the battery 100 of the present application, the gas expanding in the inner cavity 111 may act on the side wall of the negative electrode seal 132 along the gap between the second protrusion 1132 and the negative electrode seal 132, thereby breaking through the side wall of the negative electrode seal 132, causing the electrolyte in the inner cavity 111 to leak, thereby affecting the safety and sealing performance of the battery 100 of the present application.

[0073] In one embodiment, if Figure 5 and Figure 6As shown, along the second direction 002, the length of the first through hole 1121 is the second dimension L2. The second dimension L2 of the first through hole 1121 is greater than or equal to 0.275 mm.

[0074] It is understandable 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 will be reduced, resulting in a reduction in the area of ​​the first connecting piece 121 corresponding to the first bump 1131, which may cause the first connecting piece 121 to bend along the third direction 003, and may affect the position 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.

[0075] 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 protruding height of the first protrusion 1131 , so as to facilitate the fixation of the positive electrode seal 131 .

[0076] 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.

[0077] It is understandable 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 will be reduced, thereby reducing the area of ​​the second connecting piece 122 corresponding to the second protrusion 1132, which may cause the second connecting piece 122 to bend along the third direction 003, and may affect the position definition 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.

[0078] 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 protruding height of the second protrusion 1132 , so as to facilitate the fixation of the negative electrode seal 132 .

[0079] In one embodiment, if Figure 3-Figure 5 As shown, the battery housing 10 of the present application further includes a second sealing member 14 , which is located in the first through hole 1121 , between the first connecting sheet 121 and the first through hole 1121 , and adheres to the surface of the first connecting sheet 121 .

[0080] It can be understood 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 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.

[0081] In one embodiment, if Figure 3-Figure 5 As shown, the second sealing member 14 is filled between the first connecting piece 121 and the first through hole 1121, so as to prevent external impurities from entering the housing 11 through the first through hole 1121, and at the same time prevent 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. Thus, the sealing performance of the battery housing 10 of the present application is improved, and the sealing performance of the battery 100 of the present application is improved.

[0082] In one embodiment, if Figure 3-Figure 5 As shown, along the second direction 002, the opposite ends of the second sealing member 14 can also 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. This further enhances the sealing performance of the battery 100 of the present application.

[0083] In one embodiment, if Figure 5 and Figure 6 As shown, along the second direction 002, the length of the second seal 14 extending out of the first through hole 1121 is a third dimension L3, and the third dimension L3 is greater than or equal to 0.1 mm. Since the second seal 14 can melt into a fluid at a high temperature, it can be understood that setting the third dimension L3 greater than or equal to 0.1 mm can avoid the second seal 14 located outside the housing 11 still being able to achieve a sealing effect on the first through hole 1121 when the second seal 14 close to the battery cell 20 is in a molten state.

[0084] In one embodiment, if Figure 3-Figure 5 As shown, the second sealing member 14 is also located in the second through hole 1122 , between the second connecting sheet 122 and the second through hole 1122 , and adheres to the surface of the second connecting sheet 122 .

[0085] It can be understood 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 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.

[0086] In one embodiment, if Figure 3-Figure 5 As shown, 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, and prevent the electrolyte in the housing 11 from flowing out of the housing 11 through the second through hole 1122. Thus, the second sealing member 14 can cooperate with the second connecting piece 122 to seal the second through hole 1122. Thus, the sealing performance of the battery housing 10 of the present application is improved, and the sealing performance of the battery 100 of the present application is improved.

[0087] In one embodiment, if Figure 3-Figure 5 As shown, along the second direction 002, the opposite ends of the second sealing member 14 can also extend into the housing 11 and extend 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.

[0088] In one embodiment, if Figure 5 and Figure 6 As shown, along the second direction 002, the length of the second seal 14 extending out of the second through hole 1122 is a third dimension L3, and the third dimension L3 is greater than or equal to 0.1 mm. Since the second seal 14 can melt into a fluid at a high temperature, it can be understood that setting the third dimension L3 greater than or equal to 0.1 mm can avoid the second seal 14 located outside the housing 11 still being able to achieve a sealing effect on the second through hole 1122 when the second seal 14 close to the battery cell 20 is in a molten state.

[0089] In one embodiment, the housing 11 is made of metal material, and the second sealing member 14 has insulating properties. Exemplarily, the second sealing member 14 is made of activated material, and exemplarily, polypropylene. It is understandable that in other embodiments, the second sealing member 14 can also be made of liquid or gel-formed glue and prepared in a curing manner. This application does not impose any particular limitation on this.

[0090] In one embodiment, the seal 13 may also be made of activated material.

[0091] In one embodiment, the shell body 114 is made of metal material, and exemplary, the shell body 114 is made of iron alloy, aluminum alloy, etc. It can be understood that compared with the shell made of aluminum-plastic film structure used in soft-pack batteries in the prior art, the battery 100 of the present application uses metal material to make the shell body 114, which improves the strength of the shell 11, thereby improving the structural strength of the battery shell 10 of the present application, and improving the structural strength of the battery 100 of the present application.

[0092] In one embodiment, the thickness of the shell body 114 is between 20 μm and 500 μm. It is understandable that setting the shell body 114 with a thickness between 20 μm and 500 μm can ensure the strength of the shell body 114 while preventing the shell body 114 from being too thick and occupying too much space of the battery cell 20, thereby affecting the capacity of the battery 100 of the present application.

[0093] In one embodiment, the cover 115 is made of metal material, and exemplary, the cover 115 is made of iron alloy, aluminum alloy, etc. It can be understood that compared with the shell made of aluminum-plastic film structure used in the soft-pack battery in the prior art, the battery 100 of the present application uses metal material to make the cover 115, which improves the strength of the shell 11, thereby improving the structural strength of the battery 100 of the present application.

[0094] In one embodiment, the thickness of the cover 115 is between 20 μm and 500 μm. It is understandable that setting the cover 115 with 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.

[0095] In one embodiment, the housing 11 is made of an insulating material, and correspondingly, 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 be provided with the second seal 14 on the connecting sheet 12.

[0096] See also Figure 7 Another exploded schematic diagram of a battery 100 provided in one embodiment of the present application is shown, and please refer to Figure 8 Another structural schematic diagram of a battery 100 provided in one embodiment of the present application is shown.

[0097] like Figure 7 and Figure 8 As shown, the housing 11 is further provided with a recessed portion 116, which extends along the second direction 002 toward the battery cell 20, and the first protrusion 1131 and the second protrusion 1132 are both arranged in the recessed portion 116. It can be understood that the arrangement 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 further improving the capacity of the battery 100 of the present application.

[0098] In one embodiment, please refer to Figure 2The housing body 114 includes a bottom plate 1142 and a side plate 1143, and the side plate 1143 surrounds the edge of the bottom plate 1142. The end of the side plate 1143 away from the bottom plate 1142 is attached to the cover body 115 to form the inner cavity 111.

[0099] See also Fig. 9 Another structural schematic diagram of a battery 100 provided in an embodiment of the present application is shown in FIG. Figure 2 and Figure 3 .

[0100] like Figure 2 , Figure 3 and Fig. 9 As shown, the shell body 114 further includes an extension structure 114 a , which 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 .

[0101] Among them, the epitaxial structure 114a and the cover body 115 can cooperate with each other and be fixedly connected, so as to realize the fixed connection between the shell body 114 and the cover body 115. It can be understood that the provision of the epitaxial structure 114a can increase the contact area between the shell body 114 and the cover body 115 under the premise of ensuring that the overall thickness of the shell body 114 and the cover body 115 remains unchanged, so as to facilitate the connection between the shell body 114 and the cover body 115.

[0102] Specifically, in this embodiment, the connection between the shell body 114 and the cover body 115 can be welding, and the epitaxial structure 114a and the cover body 115 are welded together along the first direction 001 and the second direction 002. The welding part does not include the area where the first through hole 1121 and the second through hole 1122 are provided.

[0103] Therefore, compared with the higher assembly precision requirements of the cover and the shell required by the hard pack battery in the prior art, the connection method between the shell body 114 and the cover body 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.

[0104] At the same time, if Figure 3 and Fig. 9 As shown, the connection method between the cover body 115 and the shell body 114 of the present application is welding. In the actual manufacturing process, when the epitaxial structure 114a and the cover body 115 are welded together, the unwelded part can be cut to reduce the overall size of the battery 100 of the present application, and the first through hole 1121 and the second through hole 1122 are avoided during the cutting process to form the first bump 1131 and the second bump 1132 respectively.

[0105] 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.

[0106] In other embodiments, the cover 115 may also include a bottom plate and side plates, which is not particularly limited in the present application.

[0107] In one embodiment, please refer to Figure 5 and Figure 6 Along the first direction 001, the spacing between the side wall of the protrusion 113 and the welding point where the first part 1141 and the second part 1151 are welded to each other is the second width W2. The second width W2 is greater than or equal to 0.05 mm. It can be understood that the setting of the second width W2 can avoid damage to the welding point during the cutting process, thereby ensuring the welding effect between the first part 1141 and the second part 1151.

[0108] In one embodiment, if Figure 5 and Figure 6 As shown, along the second direction 002, the distance between the inner wall of the housing 11 and the welding point where the housing body 114 and the cover body 115 are welded to each other is a fourth dimension L4. The fourth dimension L4 is greater than or equal to 0.05 mm. It can be understood that the setting of the fourth dimension L4 can avoid damage to the welding point during the cutting process, thereby ensuring the welding effect between the housing body 114 and the cover body 115.

[0109] In one embodiment, if Figure 5 and Figure 6 As shown, the second seal 14 does not completely fill the gap between the through hole 112 and the connecting sheet 12, and along the first direction 001, the spacing between the side wall of the second seal 14 and the welding point where the first part 1141 and the second part 1151 are welded to each other is the third width W3. Wherein, W3 is greater than or equal to 0.1mm. Based on the high temperature generated during welding, the second seal 14 will melt in a high temperature environment. It can be understood that the setting of the third width W3 can ensure the limitation of the relative position of the second seal 14.

[0110] In one embodiment, if Fig. 9 As shown, the shell body 114 is further provided with a liquid injection hole 15, which is connected to the shell 11, so that electrolyte can be injected into the shell 11 through the liquid injection hole 15, thereby improving the injection efficiency of the electrolyte.

[0111] 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 rate in the shell 11.

[0112] See also Fig.10 FIG. 1 is another schematic diagram of the structure of a battery 100 provided in one embodiment of the present application.

[0113] like Fig.10 As shown, 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 at the outer edge of the housing 11 , so as to facilitate fixing of the battery 100 in the battery tray.

[0114] See also Fig.11 The structure diagram of the battery cell 20 provided in one embodiment of the present application is shown in FIG. Figure 2 , Figure 5 .

[0115] like Figure 2 , Figure 5 and Fig.11 As shown, the battery cell 20 of the present application includes a plurality of pole cores 21 provided with pole ears (not shown in the figure), wherein the plurality of pole cores 21 include a plurality of positive pole cores 21a and a plurality of negative pole cores 21b. Each positive pole core 21a corresponds to a positive pole ear (not shown in the figure), and each negative pole core 21b corresponds to a negative pole ear (not shown in the figure). The plurality of positive pole ears are gathered together and welded together to form a positive electrode 221, and the plurality of negative pole ears are gathered together and welded together to form a negative electrode 222. The positive pole cores 21a and the negative pole cores 21b are alternately stacked along the third direction 003.

[0116] Since the charge and discharge performance of the battery 100 is mainly derived from the mutual conversion of electrical energy and chemical energy, and the mutual conversion of electrical energy and chemical energy is mainly achieved through the positive electrode core 21a, the negative electrode core 21b and the electrolyte (not shown in the figure), when the battery 100 is connected to the external circuit, the positive electrode core 21a undergoes an oxidation reaction with the electrolyte to obtain electrons, and the negative electrode core 21b undergoes a reduction reaction with the electrolyte to lose electrons, thereby generating a potential difference between the positive electrode core 21a and the negative electrode core 21b, thereby achieving the conversion of chemical energy and electrical energy.

[0117] 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.

[0118] 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 providing multiple positive electrode cores 21a and multiple negative electrode cores 21b, and arranging the multiple positive electrode cores 21a and the multiple negative electrode cores 21b alternately, the battery 100 of the present application can have a larger capacity.

[0119] At the same time, the electric energy generated by the mutual cooperation of the positive electrode core 21a and the negative electrode core 21b can be output to the external circuit through each positive electrode ear and each negative electrode ear, thereby realizing 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 electrode ear and each negative electrode ear, thereby realizing the charging function of the battery 100 of the present application.

[0120] It can be understood that in this embodiment, if Fig.11 As shown, a plurality of positive electrode cores 21 a and a plurality of negative electrode cores 21 b are alternately formed into a battery cell 20 , so that the battery 100 of the present application is a blade battery.

[0121] In another embodiment, if Fig.12 As shown, multiple positive electrode cores 21a can be connected as one, and multiple negative electrode cores 21b can also be connected as one, so that the positive electrode core 21a and the negative electrode core 21b are adhered to each other and then wound to form a battery cell 20, so that the battery 100 of the present application is a roll battery.

[0122] It can be 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 realize the charging and discharging function of the battery 100 of the present application through the chemical reaction of the materials of the positive electrode core 21a and the negative electrode core 21b with 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.

[0123] In one embodiment, if Fig.11 and Fig.12 As shown, 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 are respectively attached to the positive electrode core 21a and the negative electrode core 21b. This is to achieve mutual insulation between the positive electrode core 21a and the negative electrode core 21b, and prevent problems such as short circuit and leakage from occurring inside the battery cell 20 due to the 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.

[0124] It should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0125] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0126] It should be understood that the application of the present application is not limited to the above examples. For ordinary technicians in the field, improvements or changes can be made according to the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application. Ordinary technicians in the field can understand that all or part of the processes of the above embodiments are implemented, and equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims

1. A battery casing, characterized in that: It comprises a shell, two connecting sheets and two sealing members, wherein the shell is provided with an inner cavity and two through holes communicating with the inner cavity; One end of one of the connecting pieces is located in the inner cavity, and the other end thereof passes through one of the through holes and extends out of the shell; one end of another of the connecting pieces is located in the inner cavity, and the other end thereof passes through another of the through holes and extends out of the shell; The two seals are both located outside the shell, each of the seals is respectively sleeved on the outside of one of the connecting pieces, the outer edge of each of the seals is also respectively fixed to the shell, and each of the seals is used to cover the gap between one of the connecting pieces and the through hole.

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

3. The battery housing according to claim 2, characterized in that: The shell includes a shell body and a cover body, and the two protrusions are arranged at the connection between the shell body and the cover body. Each of the protrusions includes a first part located on the shell body and a second part located on the cover body. The seal is also used to shield the gap between the first part and the second part.

4. The battery housing according to claim 3, characterized in that: The outer edge of the seal is sleeved on the outer surface of the bump, and the distance between the outer edge of the seal and the outer surface contour of the bump is greater than or equal to 0.05 mm.

5. The battery housing according to claim 2, characterized in that: Along the length direction of the connecting piece, the length of the through hole is greater than or equal to 0.275 mm.

6. The battery casing according to any one of claims 1 to 5, characterized in that: The battery further includes a second sealing member, wherein the second sealing member is at least partially located in the through hole and between the connecting sheet and the through hole.

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

8. The battery housing according to claim 6, characterized in that: The second sealing member partially extends out of the housing, and along the length direction of the connecting piece, the length of the second sealing member extending out of the housing is greater than or equal to 0.1 mm.

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

10. The battery housing according to any one of claims 1 to 5, characterized in that: The shell further comprises a recessed portion, and ends of the two connecting pieces extending out of the shell are at least partially located in the recessed portion.

11. A battery, characterized in that: It comprises a battery cell and a battery casing as described in any one of claims 1 to 10, wherein the battery cell is accommodated in an inner cavity of the battery casing, and two connecting pieces of the battery casing are respectively connected to a positive electrode and a negative electrode of the battery cell.

12. A battery assembly, characterized in that: It comprises a battery tray and the battery as claimed in claim 11, wherein the battery is accommodated in the battery tray.

13. An electrical equipment, characterized in that: Comprising the battery assembly as claimed in claim 12.

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