Battery, battery module and vehicle

Abstract

The invention relates to a battery, a battery module and a vehicle. The battery comprises a shell, a battery cell and two connecting pieces, at least partial area of the shell is conductive, the battery cell is accommodated in the shell, the two connecting pieces are respectively conducted with two electrodes of the battery cell, one connecting piece is conducted to the conductive area of the shell, and the other connecting piece extends out of the shell and is separated from the conductive area of the shell. And the conductive area of the shell and the connecting sheet extending out of the shell are respectively used for being conducted with an external circuit. According to the battery disclosed by the invention, the connecting sheet conducted with the battery cell electrode is conducted to the conductive area of the shell, so that the battery disclosed by the invention can be conducted with an external circuit through the connecting sheet extending out of the shell and the conductive area of the shell, and thus the current transmission function of the battery disclosed by the invention is realized; the influence of extension of the connecting sheet on the sealing performance is reduced, so that the sealing performance of the battery is improved, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery, a battery module comprising the battery, and a vehicle comprising the battery module. 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 with improved sealing performance, a battery module including the battery, and a vehicle including the battery module. The specific technical solutions include the following:

[0005] In a first aspect, an embodiment of the present application provides a battery, comprising a shell, a battery cell and two connecting plates, wherein at least a portion of the shell is conductive, the battery cell is accommodated in the shell, and the two connecting plates are respectively conductive to two electrodes of the battery cell, wherein one of the connecting plates is conductive to the conductive area of ​​the shell, and the other connecting plate extends out of the shell and is spaced apart from the conductive area of ​​the shell, and the conductive area of ​​the shell and the connecting plate extending out of the shell are respectively used to be conductive to an external circuit.

[0006] The battery of the present application connects a connecting piece that is conductive to the electrode of the battery cell to the conductive area of ​​the shell, and extends another connecting piece that is conductive to the electrode of the battery cell out of the shell, so that the battery of the present application can be connected to the external circuit through the connecting piece extending out of the shell and the conductive area of ​​the shell, thereby achieving the current transmission function of the battery of the present application while reducing the influence of the extension of the connecting piece on the sealing performance, thereby improving the sealing performance of the battery of the present application and reducing the cost.

[0007] In one embodiment, the housing includes two detachable parts, and the conductive area of ​​the housing is disposed on one of the parts of the housing.

[0008] In one embodiment, at least one of the two parts of the shell includes a bottom plate and a side plate, and the conductive area of ​​the shell is at least arranged on the side plate and is conductively connected to a connecting piece.

[0009] In one embodiment, the connecting piece extending out of the housing passes through the gap between the two parts of the housing.

[0010] In one embodiment, the battery further includes an insulating member, which is at least partially located at the gap and between the connecting piece extending out of the housing and the gap.

[0011] In one embodiment, the insulating member is filled between the connecting piece and the gap, and the insulating member is also used to seal the gap.

[0012] In one embodiment, the battery further comprises a sealing member, one end of which surrounds and is fixed to the end of the connecting piece extending out of the shell, and the other end of the sealing member extends toward the shell and fits against the outer surface of the shell.

[0013] In one embodiment, two electrodes of the battery cell are arranged at intervals on the same side of the battery cell; the battery also includes a positioning plate, which is accommodated in the shell; the positioning plate is provided with two through holes spaced apart from each other, and two connecting plates respectively pass through a through hole and are connected to an electrode, and the positioning plate is used to limit the relative position between the two connecting plates.

[0014] In a second aspect, an embodiment of the present application provides a battery module, including a battery tray and a battery, wherein the battery is accommodated in the battery tray.

[0015] In a third aspect, an embodiment of the present application provides a vehicle, including a battery module.

[0016] It can be understood that the battery module provided in the second aspect of the present application and the vehicle provided in the third aspect both have the effect of improving sealing performance and reducing costs because they adopt the battery provided in the first aspect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an exploded schematic diagram of a battery 100 provided in one embodiment of the present application;

[0018] Figure 2 A schematic diagram of a partial structure of a battery 100 provided in an embodiment of the present application;

[0019] Figure 3 A partial cross-sectional schematic diagram of a battery 100 provided in an embodiment of the present application;

[0020] Figure 4 A partially enlarged schematic diagram of a battery 100 provided in an embodiment of the present application;

[0021] Figure 5 Another partial structural schematic diagram of a battery 100 provided in an embodiment of the present application;

[0022] Figure 6 Another exploded schematic diagram of a battery 100 provided in an embodiment of the present application;

[0023] Figure 7 A schematic diagram of the structure of a battery 100 provided in one embodiment of the present application;

[0024] Figure 8 This is another exploded schematic diagram of a battery 100 provided in an embodiment of the present application;

[0025] Fig. 9 Another structural schematic diagram of a battery 100 provided in an embodiment of the present application;

[0026] Fig.10 This is a schematic diagram of the structure of a battery cell 20 provided in one embodiment of the present application;

[0027] Fig.11 FIG. 2 is another schematic diagram of the structure of a battery cell 20 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The vehicle provided in the present application includes a vehicle body and a battery module, and the battery module is housed in the vehicle body to protect the battery module. The battery module is used to provide electrical energy to the vehicle and drive the vehicle to operate. Among them, the battery module 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.

[0033] See also Figure 1 The exploded schematic diagram of the battery 100 provided in one embodiment of the present application is shown in FIG. Figure 2 FIG. 1 is a partial structural diagram 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.

[0034] like Figure 1 and Figure 2As shown, the battery 100 of the present application includes a shell 10 and a battery cell 20. The battery cell 20 is accommodated in the shell 10, and the shell 10 is used to prevent external impurities from entering the shell 10, thereby protecting the battery cell 20. At the same time, the shell 10 also provides a receiving space for accommodating an electrolyte (not shown in the figure), so that the external electrolyte is also injected into the shell 10, and cooperates with the battery cell 20 to achieve the charge and discharge performance of the battery 100 of the present application.

[0035] 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.

[0036] 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.

[0037] For ease of description, Figure 1 In the subsequent figures, the plane directions of the housing 10 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.

[0038] See also Figure 3 The partial cross-sectional diagram of the battery 100 provided in one embodiment of the present application is shown in FIG. Figure 1 and Figure 2 .

[0039] like Figure 1-Figure 3 As shown, the battery 100 of the present application further includes two connecting sheets 30, namely a first connecting sheet 31 and a second connecting sheet 32. One end of the first connecting sheet 31 is connected to the positive electrode 221, and the other end passes through the housing 10 along the second direction 002 and partially extends out of the housing 10.

[0040] At least part of the housing 10 is conductive. One end of the second connecting piece 32 is conductive with the negative electrode 222, and the other end is conductive with the conductive region. In addition, the first connecting piece 31 and the conductive region are spaced apart from each other to prevent the first connecting piece 31 and the second connecting piece 32 from being conductive through the conductive region, thereby ensuring the safety of the battery 100 of the present application.

[0041] The external circuit can be respectively connected to the first connecting piece 31 extending out of the shell 10 and the conductive area of ​​the shell 10. Specifically, the positive electrode of the external circuit can be connected to the positive electrode 221 of the battery cell 20 through the first connecting piece 31, and the negative electrode of the external circuit can be connected to the second connecting piece 32 through the conductive area of ​​the shell 10, and connected to the negative electrode 222 through the second connecting piece 32. This is to facilitate the charging and discharging functions of the battery 100 of the present application.

[0042] It is understandable that in other embodiments, the first connecting sheet 31 may also be connected to the negative electrode 222 of the battery cell 20, and correspondingly, the second connecting sheet 32 ​​should be connected to the positive electrode 221 of the battery cell 20. Correspondingly, the positive electrode of the external circuit is connected to the second connecting sheet 32, and the negative electrode of the external circuit is connected to the first connecting sheet 31.

[0043] Therefore, compared with the cover plate with conductive columns used in the hard-pack battery in the prior art, the conduction method between the battery cell in the shell and the external circuit is realized. The battery 100 of the present application is provided with a shell 10 with conductivity in at least part of the area, and the second connecting piece 32 is connected between the conductive area of ​​the shell 10 and an electrode 22, and the first connecting piece 31 extending out of the shell 10 is connected to the other electrode 22 and is spaced from the conductive area. Under the premise of ensuring the charging and discharging function of the battery 100 of the present application, the number of connecting pieces 30 extending out of the shell 10 is reduced, thereby reducing the influence of the extension of the connecting piece 30 on the sealing performance, thereby improving the sealing performance of the battery 100 of the present application.

[0044] Specifically, in one embodiment, Figure 1-Figure 3 As shown, the housing 10 includes two parts that can be detachably connected, and the conductive area of ​​the housing 10 is arranged on one part of the housing 10. The two parts of the housing 10 are the housing body 11 and the cover 12. Along the third direction 003, the housing body 11 and the cover 12 are attached to each other to form a receiving space for receiving the battery cell 20 (not shown in the figure). The conductive area of ​​the housing 10 is arranged on the housing body 11 and / or the cover 12.

[0045] One end of the second connecting piece 32 away from the battery cell 20 is attached to the connection between the shell body 11 and the cover body 12, and the first connecting piece 31 passes through the gap 13 between the shell body 11 and the cover body 12. When the shell body 11 is conductive, the first connecting piece 31 is spaced from the shell body 11. When the cover body 12 is conductive, the first connecting piece 31 is spaced from the cover body 12. This ensures that the first connecting piece 31 is spaced from the conductive area of ​​the shell 10, thereby preventing the first connecting piece 31 and the second connecting piece 32 from being short-circuited.

[0046] It can be understood that the end of the second connecting piece 32 is arranged at the connection between the shell body 11 and the cover body 12, so that when the shell body 11 is fixedly connected to the cover body 12, the second connecting piece 32 can also be fixedly connected between the shell body 11 and the cover body 12, thereby ensuring the conduction between the second connecting piece 32 and the conductive area of ​​the shell 10, and limiting the position of the second connecting piece 32. Prevent the second connecting piece 32 from shifting during transportation and causing short circuits and the like. In turn, the safety performance of the battery 100 of the present application is improved.

[0047] See also Figure 4 The partially enlarged schematic diagram of the battery 100 provided in one embodiment of the present application is shown in FIG. Figure 1 .

[0048] like Figure 1 and Figure 4 As shown, at least one of the two parts of the housing 10 includes a bottom plate 10a and a side plate 10b. The side plate 10b surrounds the edge of the bottom plate 10a to form a receiving space (not shown) capable of receiving the battery cell 20. The end of the second connecting piece 32 away from the battery cell 20 is in contact with the surface of the side plate 10b facing the battery cell 20.

[0049] Specifically, Figure 1 As shown, the housing body 11 includes a first bottom plate 111 and a first side plate 112, and the first side plate 112 surrounds the edge of the first bottom plate 111. The housing body 11 is conductive. Figure 4 The bottom plate 10a is the first bottom plate 111, and the side plate 10b is the first side plate 112. Correspondingly, the end of the second connecting piece 32 away from the battery cell 20 is in contact with the surface of the first side plate 112 facing the battery cell 20, so that the external circuit can be connected to the battery cell 20 through the shell body 11 and the first connecting piece 31.

[0050] On the other hand, Figure 1 As shown, the cover body 12 includes a second bottom plate 121 and a second side plate 122, and the second side plate 122 surrounds the edge of the second bottom plate 121. The cover body 12 is conductive. Figure 4 The bottom plate 10a is the second bottom plate 121, and the side plate 10b is the second side plate 122. Correspondingly, the end of the second connecting piece 32 away from the battery cell 20 is in contact with the surface of the second side plate 122 facing the battery cell 20, so that the external circuit can be connected to the battery cell 20 through the cover 12 and the first connecting piece 31.

[0051] It can be understood that the end of the second connecting piece 32 is attached to the surface of the side plate 10b close to the battery cell 20 to ensure that the second connecting piece 32 is accommodated in the shell 10, thereby further reducing the influence of the second connecting piece 32 on the connection effect between the shell body 11 and the cover body 12. The sealing performance of the battery 100 of the present application is further improved.

[0052] In another embodiment, the housing body 11 includes a first bottom plate 111 and a first side plate 112. The corresponding cover body 12 can be set as a sheet structure only. Correspondingly, in another embodiment, the cover body 12 includes a second bottom plate 121 and a second side plate 122, and the corresponding housing body 11 is set as a sheet structure only.

[0053] In one embodiment, if Figure 1-Figure 4 As shown, the positive electrode 221 and the negative electrode 222 of the battery cell 20 are located on the same side of the pole core 21 along the second direction 002. Correspondingly, the first connecting piece 31 and the second connecting piece 32 are also located on the same side of the pole core 21.

[0054] It can be understood that in other embodiments, such as Figure 5 As shown, the first connecting piece 31 and the second connecting piece 32 may also be located on different sides of the pole core 21 to increase the distance between the first connecting piece 31 and the second connecting piece 32 to further avoid short circuit.

[0055] In one embodiment, if Figure 1-Figure 3 As shown, the battery 100 of the present application further includes an insulating member 40 . The insulating member 40 is partially located in the gap 13 , between the first connecting sheet 31 and the gap 13 , and adheres to the surface of the first connecting sheet 31 .

[0056] Based on the fact that at least part of the housing 10 is conductive, it is understandable that the provision of the insulating member 40 can achieve the mutual spacing between the first connecting piece 31 and the housing 10, thereby avoiding contact between the first connecting piece 31 and the conductive area of ​​the housing 10, and ensuring the safety of the battery 100 of the present application.

[0057] At the same time, the provision of the insulating member 40 can also reduce the gap between the first connecting piece 31 and the gap 13, thereby shielding the gap 13 and reducing the possibility of external impurities entering the housing 10 through the gap 13. This ensures the sealing performance of the battery 100 of the present application.

[0058] In one embodiment, if Figure 1-Figure 3As shown, the insulating member 40 is filled between the first connecting piece 31 and the gap 13, so as to prevent external impurities from entering the housing 10 through the gap 13 and prevent the electrolyte in the housing 10 from flowing out of the housing 10 through the gap 13. Thus, the insulating member 40 can cooperate with the first connecting piece 31 to seal the gap 13, thereby improving the sealing performance of the battery 100 of the present application.

[0059] In one embodiment, if Figure 1-Figure 3 As shown, along the second direction 002, the opposite ends of the insulating member 40 can also extend into and out of the housing 10, respectively, to further enhance the insulating effect of the insulating member 40 on the first connecting piece 31, and further reduce the possibility of the first connecting piece 31 and the second connecting piece 32 being connected, thereby further enhancing the safety performance of the battery 100 of the present application.

[0060] At the same time, when the insulating member 40 is filled between the first connecting piece 31 and the gap 13, the extension of the opposite ends of the insulating member 40 can further enhance the sealing effect of the insulating member 40 on the gap 13, thereby further enhancing the sealing performance of the battery 100 of the present application.

[0061] In one embodiment, if Figure 1-Figure 3 As shown, the battery 100 of the present application also includes a seal 50, which is located outside the shell 10, and the seal 50 exchanges heat and is fixed to the end of the first connecting piece 31 extending out of the shell 10, and extends toward the shell 10 and fits with the outer surface of the shell 10.

[0062] It can be understood that when the insulating member 40 is not completely filled between the first connecting piece 31 and the gap 13, the setting of the sealing member 50 further blocks the possibility of external impurities entering the housing 10, and at the same time, blocks the internal electrolyte from flowing out of the housing 10 through the gap between the insulating member 40 and the gap 13. Thereby, the sealing performance of the battery 100 of the present application is improved.

[0063] When the insulating member 40 is completely filled between the first connecting piece 31 and the gap 13, the provision of the sealing member 50 further improves the sealing effect of the gap 13 of the present application, thereby further improving the sealing performance of the battery 100 of the present application.

[0064] In one embodiment, the insulating member 40 is made of a copolymer such as polypropylene.

[0065] In one embodiment, the seal 50 is made of a heat-activated seal material, exemplarily polypropylene. It is understandable that in other embodiments, the seal 50 can also be made of a liquid or gel-like glue material and cured. This application does not impose any particular limitation on this.

[0066] See also Figure 6Another exploded schematic diagram of a battery 100 provided in one embodiment of the present application is shown.

[0067] like Figure 6 As shown, the positive electrode 221 and the negative electrode 222 of the battery cell 20 are arranged at intervals on the same side of the battery cell 20. The battery 100 of the present application includes a positioning plate 60, which is accommodated in the housing 10, and has two mutually spaced through holes 61 on the positioning plate 60. Each through hole 61 is respectively arranged to correspond to the positive electrode 221 and the negative electrode 222.

[0068] Specifically, one end of the first connecting piece 31 passes through a corresponding through hole 61 to be connected to the positive electrode 221, and the other end extends out of the housing 10 to be connected to the external circuit. One end of the second connecting piece 32 passes through another through hole 61 to be connected to the negative electrode 222, and the other end is connected to the conductive area of ​​the housing 10.

[0069] During the transportation of the battery 100, the first connecting piece 31 and the second connecting piece 32 may be offset along the first direction 001 due to vibration during transportation. It can be understood that the arrangement of the positioning plate 60 can limit the relative position between the first connecting piece 31 and the second connecting piece 32, thereby avoiding the phenomenon that the first connecting piece 31 and the second connecting piece 32 are offset along the first direction 001 and cause the two connecting pieces 30 to short-circuit. The safety of the battery 100 of the present application is further ensured.

[0070] In one embodiment, if Figure 1-Figure 3 As shown, the shell body 11 further includes a first epitaxial structure 113, which is disposed at an end of the first side plate 112 away from the first bottom plate 111 and extends outward in a direction away from the battery cell 20. Correspondingly, the cover body 12 further includes a second epitaxial structure 123, which is disposed at an end of the second side plate 122 away from the second bottom plate 121 and extends outward in a direction away from the battery cell 20.

[0071] Among them, the first epitaxial structure 113 and the second epitaxial structure 123 can cooperate with each other and be fixedly connected, so as to realize the fixed connection between the shell body 11 and the cover body 12. It can be understood that the arrangement of the first epitaxial structure 113 and the second epitaxial structure 123 can increase the contact area between the shell body 11 and the cover body 12 under the premise of ensuring that the overall thickness of the shell body 11 and the cover body 12 remains unchanged, so as to facilitate the connection between the shell body 11 and the cover body 12.

[0072] Specifically, in this embodiment, the connection between the shell body 11 and the cover body 12 can be welded, and the first epitaxial structure 113 and the second epitaxial structure 123 are welded together along the first direction 001 and the second direction 002. The welded portion includes the end of the second connecting piece 32 away from the battery cell 20, and does not include the gap 13 of the shell 10 through which the end of the first connecting piece 31 away from the battery cell 20 passes.

[0073] 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 11 and the cover body 12 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.

[0074] It is understandable that in other embodiments, the connection method between the shell body 11 and the cover body 12 in the battery 100 of the present application can also be other, and the present application does not specifically limit this.

[0075] See also Figure 7 The structure diagram of the battery 100 provided in one embodiment of the present application is shown in FIG. Figure 3 .

[0076] like Figure 3 and Figure 7 As shown, the housing 10 is provided with two protrusions 14, namely a first protrusion 141 and a second protrusion 142. The gap 13 is provided in the first protrusion 141. The end of the first connecting piece 31 away from the battery cell 20 extends out of the first protrusion 141 through the gap 13. The sealing member 50 surrounds and is fixed to the periphery of the first connecting piece 31, and extends toward the outer surface of the housing 10 along the second direction 002, and is provided around the periphery of the first protrusion 141.

[0077] Based on the present application, the connection between the cover body 12 and the shell body 11 is welding. In the actual manufacturing process, when the first epitaxial structure 113 and the second epitaxial structure 123 are welded together, the unwelded portion can be cut to reduce the overall size of the battery 100 of the present application, and the cutting process avoids the partial area where the second connecting piece 32 is clamped and the area where the gap 13 is located, so as to form the first protrusion 141 and the second protrusion 142 respectively.

[0078] The first protrusion 141 includes a first portion 114 located at the housing body 11 and a second portion 124 located at the cover body 12. The first portion 114 and the second portion 124 are welded to each other, and a gap 13 is formed between the first portion 114 and the second portion 124.

[0079] It can be understood that the seal 50 is arranged around the periphery of the first protrusion 141, and the seal 50 is in contact with the outer surface of the housing 10, which can prevent the electrolyte in the housing 10 from flowing out from the side wall of the first protrusion 141 through the gap 13 along the first direction 001. The sealing effect of the seal 50 on the gap 13 is further improved, and the sealing performance of the battery 100 of the present application is further improved.

[0080] As for the second protrusion 142, the arrangement of the second protrusion 142 ensures the connection area between the second connecting piece 32 and the shell body 11 and the cover body 12, thereby ensuring the welding strength of the second connecting piece 32. The connection stability of the battery 100 of the present application is improved.

[0081] In one embodiment, if Figure 7 As shown, the housing 10 is further provided with a recessed portion 15, which extends along the second direction 002 toward the battery cell 20, and the first protrusion 141 and the second protrusion 142 are both arranged in the recessed portion 15. It can be understood that the arrangement of the recessed portion 15 reduces the size of the first protrusion 141 and the second protrusion 142 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.

[0082] In one embodiment, the shell body 11 is made of a conductive metal material, and illustratively, the shell body 11 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 a metal material to prepare the shell body 11, which improves the strength of the shell 10, thereby improving the structural strength of the battery 100 of the present application.

[0083] In one embodiment, the thickness of the shell body 11 is between 20 μm and 500 μm. It is understandable that setting the shell body 11 with a thickness between 20 μm and 500 μm can ensure the strength of the shell body 11 while preventing the shell body 11 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.

[0084] In one embodiment, the cover 12 is made of a conductive metal material, and illustratively, the cover 12 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 a metal material to make the cover 12, which improves the strength of the shell 10, thereby improving the structural strength of the battery 100 of the present application.

[0085] In one embodiment, the thickness of the cover 12 is between 20 μm and 500 μm. It is understandable that setting the cover 12 with a thickness between 20 μm and 500 μm can ensure the strength of the cover 12 while preventing the cover 12 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.

[0086] In one embodiment, if Figure 7 As shown, the housing body 10 is further provided with a liquid injection hole 70, which is connected to the housing 10, so as to inject electrolyte into the housing 10 through the liquid injection hole 70, thereby improving the injection efficiency of the electrolyte.

[0087] 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 70, which can reduce the loss of electrolyte during electrolyte injection, thereby achieving control of the electrolyte flow rate in the shell 10.

[0088] See also Figure 8 Another exploded schematic diagram of a battery 100 provided in one embodiment of the present application is shown.

[0089] like Figure 8 As shown, the battery 100 of the present application further includes an explosion-proof valve 80. The explosion-proof valve 80 is disposed on the cover 12, so that when the temperature and pressure inside the battery 100 are high, the explosion-proof valve 80 is opened to release the pressure of the gas inside the shell 10, thereby ensuring the safety of the battery 100 of the present application.

[0090] Specifically, in this embodiment, the explosion-proof valve 80 can be formed by thinning a portion of the cover 12, so that when high-temperature and high-pressure gas is generated in the housing 10, the high-temperature and high-pressure gas can directly break through the portion to achieve pressure relief, thereby ensuring the safety of the battery 100 of the present application.

[0091] In one embodiment, the insulating member 40 and the sealing member 50 can also serve as the structure of the explosion-proof valve 80. When high-temperature and high-pressure gas is generated inside the housing 10, the high-temperature environment will directly melt the insulating member 40 and the sealing member 50, or the high-pressure environment will directly damage the sealing structure formed by the insulating member 40 and the sealing member 50, thereby achieving pressure relief. The battery 100 of the present application is safe to use.

[0092] See also Fig. 9 Another structural schematic diagram of a battery 100 provided in one embodiment of the present application is shown.

[0093] like Fig. 9 As shown, the battery 100 of the present application further includes a fixing member 90 , wherein a plurality of fixing members 90 are provided and are disposed at the outer edge of the shell 10 , so as to facilitate fixing the battery 100 in the battery tray.

[0094] See also Fig.10 The structure diagram of the battery cell 20 provided in one embodiment of the present application is shown in FIG. Figure 1 .

[0095] like Figure 1 and Fig.10 As shown, the battery cell 20 of the present application includes a plurality of pole cores 21 provided with pole ears 211, 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 211a, and each negative pole core 21b corresponds to a negative pole ear 211b. The plurality of positive pole ears 211a are gathered together and welded together to form a positive electrode 221, and the plurality of negative pole ears 211b 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 and arranged along the third direction 003.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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 211a and each negative electrode ear 211b, 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 211a and each negative electrode ear 211b, thereby realizing the charging function of the battery 100 of the present application.

[0100] It can be understood that in this embodiment, if Fig.10 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.

[0101] In another embodiment, if Fig.11 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.

[0102] 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.

[0103] In one embodiment, if Fig.10 and Fig.11 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.

[0104] 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.

[0105] 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.

[0106] 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, characterized in that: The invention comprises a shell, a battery cell and two connecting pieces, wherein at least a part of the shell is conductive, the battery cell is accommodated in the shell, and the two connecting pieces are respectively conductive with two electrodes of the battery cell, wherein one of the connecting pieces is conductive to the conductive area of ​​the shell, and the other connecting piece extends out of the shell and is spaced apart from the conductive area of ​​the shell, and the conductive area of ​​the shell and the connecting piece extending out of the shell are respectively used for conductive connection with an external circuit.

2. The battery according to claim 1, characterized in that The shell comprises two detachable parts, and the conductive area of ​​the shell is arranged on one of the parts of the shell.

3. The battery according to claim 2, characterized in that At least one of the two parts of the shell includes a bottom plate and a side plate, and the conductive area of ​​the shell is at least arranged on the side plate and is conductively connected to one of the connecting pieces.

4. The battery according to claim 2, characterized in that The connecting piece extending out of the housing passes through a gap between two parts of the housing.

5. The battery according to claim 4, characterized in that The battery further includes an insulating member, which is at least partially located at the gap and between the connecting piece extending out of the housing and the gap.

6. The battery according to claim 5, characterized in that The insulating member is filled between the connecting piece and the gap, and the insulating member is also used to seal the gap.

7. The battery according to any one of claims 1 to 6, characterized in that: The battery further comprises a sealing member, one end of which surrounds and is fixed to the end of the connecting piece extending out of the shell, and the other end of which extends toward the shell and fits with the outer surface of the shell.

8. The battery according to any one of claims 1 to 6, characterized in that: The two electrodes of the battery cell are arranged at a same side of the battery cell at intervals; the battery further comprises a positioning plate, and the positioning plate is accommodated in the shell; The positioning plate is provided with two through holes spaced apart from each other, the two connecting sheets respectively pass through one of the through holes and are connected to one of the electrodes, and the positioning plate is used to define the relative position between the two connecting sheets.

9. A battery module, characterized in that: It comprises a battery tray and a battery as described in any one of claims 1 to 8, wherein the battery is accommodated in the battery tray.

10. A vehicle, characterized in that: Comprising the battery module as claimed in claim 9.

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