Battery and battery device

Abstract

The invention provides a battery and a battery device, relates to the technical field of batteries, and is used for solving the problems of low battery space utilization rate and low battery energy density caused by the fact that a pole protrudes out of the side wall of a shell in the related art. The battery cell is arranged in the shell, a first side wall of the shell comprises a first sub-wall and a second sub-wall, and a first concave part is formed on the first sub-wall; the pole structure is arranged in the first concave part; the first end of the pole structure extends into the shell from a first through hole formed in the first concave part and is connected with a first tab arranged on the battery cell; the plane where the end face of the second end of the pole structure is located does not exceed the plane where the second sub-wall is located. The first concave part is arranged on the side wall of the shell, and the pole structure is arranged in the first concave part, so that the pole structure is prevented from protruding out of the shell, the space utilization rate of the battery is improved, and the energy density of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery and a battery device. BACKGROUND

[0002] The battery includes a shell and an electric core arranged in the shell. The positive pole lug of the electric core is led out by a positive pole post arranged on the outer wall of the shell. The negative pole lug of the electric core is directly connected with the shell, so that the shell is negatively charged. The battery protection plate is usually directly connected with the positive and negative poles of the battery to monitor and control the inflow and outflow of current, prevent the battery voltage from exceeding the safety threshold, and avoid the damage of the battery caused by overcharging.

[0003] In the related art, the positive pole post arranged on the outer wall of the shell protrudes from the outer wall of the shell. When the battery protection plate is connected with the positive pole post, the space between the battery protection plate and the outer wall of the shell is large, which leads to the waste of the space of the battery and reduces the energy density of the battery. SUMMARY

[0004] In view of the above problems, the embodiments of the present application provide a battery and a battery device to solve the problem of low space utilization and low energy density of the battery caused by the protrusion of the pole post from the side wall of the shell in the related art.

[0005] To achieve the above purpose, the embodiments of the present application provide the following technical solutions:

[0006] The battery provided by the embodiments of the present application includes a shell, an electric core and a pole post structure. The electric core is arranged in the shell. The electric core includes a first pole piece, a diaphragm and a second pole piece. The first pole piece includes a first pole piece body and a first pole lug extending from one side edge of the first pole piece body. The second pole piece includes a second pole piece body and a second pole lug extending from one side edge of the second pole piece body.

[0007] The first side wall of the shell includes an abutting first sub-wall and a second sub-wall. The second sub-wall is formed with a first recessed part recessed towards the electric core. The pole post structure is arranged in the first recessed part. In the recessed direction of the first recessed part, the pole post structure includes opposite first and second ends. The first end passes through a first through hole arranged on the first recessed part and extends into the shell to be connected with the first pole lug of the electric core. The end face of the second end does not exceed the plane where the second sub-wall is located. The second pole lug of the electric core and the first pole lug are opposite in polarity. The second pole lug is connected with the second sub-wall.

[0008] In an embodiment of the present application, the pole structure comprises: a pole body; one end of the pole body extends into the shell from the first through hole and is connected with the first tab; an outer periphery of the pole body is covered with an insulating layer; and / or the other end of the pole body is provided with a top cover, a first surface of the top cover is opposite to a bottom surface of the first recess in the recessing direction of the first recess, an outer insulating sheet is arranged between the first surface and the bottom surface of the first recess, an annular flange extending towards the bottom surface of the first recess is arranged on the outer insulating sheet, and the annular flange surrounds the outer periphery of the pole body; and / or at least two flanges extending away from the bottom surface of the first recess are arranged on the outer insulating sheet, and the at least two flanges surround the side peripheral wall of the top cover.

[0009] In an embodiment of the present application, the battery further comprises: a connecting sheet; the connecting sheet is arranged in the shell, the connecting sheet comprises a first connecting section, an intermediate connecting section and a second connecting section, two ends of the intermediate connecting section are respectively connected with the first connecting section and the second connecting section; in the recessing direction of the first recess, the first connecting section is opposite to the first recess, and the second connecting section is opposite to the second sub-wall; the first connecting section is connected with the first end, and the second connecting section is connected with the first tab.

[0010] In an embodiment of the present application, a height difference h between a plane where the first connecting section is located and a plane where the second connecting section is located is 0.2-0.8 mm, and / or in the length direction of the battery, a distance between the first sub-wall and the first tab body is less than or equal to a distance between the second sub-wall and the second tab body.

[0011] In an embodiment of the present application, the battery further comprises: an inner insulating sheet; the inner insulating sheet is arranged in the shell, and the inner insulating sheet is arranged between the connecting sheet and the first side wall.

[0012] In an embodiment of the present application, a projection of the inner insulating sheet in the recessing direction of the first recess has a first length, a projection of the connecting sheet in the recessing direction of the first recess has a second length, and a difference between the first length and the second length is greater than 0.2 mm.

[0013] In an embodiment of the present application, in the recessing direction of the first recess, the projection of the inner insulating sheet covers the projection of the connecting sheet; and / or the projection of the first recess does not coincide with the projection of the first tab; and / or a projection of the pole structure on the first side wall does not overlap with a projection of the first tab on the first side wall.

[0014] In an embodiment of the present application, the connecting corner between the first sub-wall and the second sub-wall is an arc-shaped corner; and / or, the connecting corner between the intermediate transition section and the first connecting section, and the connecting corner between the intermediate transition section and the second connecting section are arc-shaped corners.

[0015] In an embodiment of the present application, the battery further comprises: a sealing cover; a second recessed portion recessed towards the battery cell is formed on the second sub-wall, the second recessed portion is arranged in a spaced manner with the first recessed portion, and a plane in which the end surface of the second end is located is flush with a plane in which the second recessed portion is located; in the recessed direction of the first recessed portion, the first tab has a first projection, the second tab has a second projection, the first recessed portion has a third projection, and the second recessed portion has a fourth projection; the first projection is located between the third projection and the fourth projection, and the second projection coincides with the fourth projection; the second recessed portion is provided with a liquid injection hole, and the sealing cover is in sealing connection with the liquid injection hole.

[0016] The embodiments of the present application also provide a battery device, which comprises the battery described above, and further comprises a battery protection plate; the battery protection plate comprises a substrate, and a first conductive member and a second conductive member arranged on the substrate, the first conductive member is connected with the second end of the pole structure, and the second conductive member is connected with the second sub-wall; or, the second conductive member is connected in the second recessed portion.

[0017] The battery provided by the embodiments of the present application has the following technical effects:

[0018] By arranging the first recessed portion on the side wall of the shell and arranging the pole structure of the positive electrode in the first recessed portion, the pole structure is prevented from protruding out of the side wall of the shell, thereby reducing the distance between the battery protection plate and the side wall of the shell, improving the space utilization rate of the battery, and improving the energy density of the battery.

[0019] Meanwhile, the side wall of the shell comprises the first sub-wall and the second sub-wall which are adjacent to each other, and the first recessed portion is arranged on the first side wall, so that the distance between the battery cell and the first sub-wall is greater than the distance between the battery cell and the second sub-wall, the space inside the shell is fully utilized, the space inside the shell is prevented from being wasted, and the energy density is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0021] Figure 1 A perspective view of a battery according to an embodiment of the present application;

[0022] Figure 2 An exploded view of a battery according to an embodiment of the present application Figure 1 ;

[0023] Figure 3 An exploded view of a battery according to an embodiment of the present application Figure 2 ;

[0024] Figure 4 A cross-sectional view of a battery according to an embodiment of the present application Figure 1 ;

[0025] Figure 5 A cross-sectional view of a battery according to an embodiment of the present application;

[0026] Figure 6 A cross-sectional view of a battery according to an embodiment of the present application connected with a protection plate;

[0027] Figure 7 A structure diagram of a connecting piece of a battery according to an embodiment of the present application Figure 1 ;

[0028] Figure 8 A structure diagram of a connecting piece of a battery according to an embodiment of the present application Figure 2 ;

[0029] Figure 9 A structure diagram of a connecting piece of a battery according to an embodiment of the present application Figure 3 ;

[0030] Figure 10 A perspective view of a battery according to an embodiment of the present application;

[0031] Figure 11 An exploded view of a battery according to an embodiment of the present application;

[0032] Figure 12 A structure diagram of a bottom shell of a battery according to an embodiment of the present application;

[0033] Figure 13 A top view of a battery according to an embodiment of the present application;

[0034] Figure 14 A cross-sectional view of a battery according to an embodiment of the present application connected with a protection plate.

[0035] Reference signs:

[0036] 100 - shell;

[0037] 101 - cover plate; 102 - bottom plate; 103 - side wall; 104 - first side wall; 105 - first recess; 106 - second recess;

[0038] 1011 - first pressure relief score; 1021 - second pressure relief score; 1041 - liquid injection hole; 1051 - first through hole;

[0039] 200 - battery cell;

[0040] 201 - first tab; 202 - second tab; 203 - second side wall;

[0041] 300 - pole structure;

[0042] 302 - second pole body; 303 - outer insulation sheet;

[0043] 3011 - top cover; 3012 - first pole body; 3031 - annular flange;

[0044] 400 - connecting sheet;

[0045] 401 - first connecting section; 402 - second connecting section; 403 - intermediate adapting section;

[0046] 4011 - second through hole;

[0047] 500 - inner insulation sheet;

[0048] 600 - sealing cover;

[0049] 700 - base plate;

[0050] 800 - first conductive member;

[0051] 900 - second conductive member. DETAILED DESCRIPTION

[0052] In order to make the above objectives, features and advantages of the embodiments of the present application more apparent and understandable, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0053] In the embodiments of the present application, the recess direction of the first recess and the length direction of the battery are both the x-axis shown in the figure; and the width direction of the battery is the y-axis shown in the figure.

[0054] Reference Figure 1 , Figure 2 , Figure 3 andFigure 4 The battery provided by the embodiments of the present application comprises a shell 100, a battery cell 200, and a pole structure 300.

[0055] The battery cell 200 comprises a first pole piece, a diaphragm, and a second pole piece. The first pole piece comprises a first pole piece body and a first tab extending from a side edge of the first pole piece body. The second pole piece comprises a second pole piece body and a second tab extending from a side edge of the second pole piece body. In one embodiment, the first pole piece can be a positive pole piece, and the second pole piece can be a negative pole piece. In another embodiment, the first pole piece can be a negative pole piece, and the second pole piece can be a positive pole piece.

[0056] In a possible implementation, the battery cell is a stacked cell. The pole pieces of the topmost layer and the bottommost layer of the stacked cell are single-sided negative pole pieces, i.e., the single-sided negative pole pieces comprise a negative current collector and a negative active layer on a side surface of the negative current collector close to the center of the battery cell.

[0057] The shell 100 comprises a cover plate 101, a bottom plate 102, and a side wall 103. The side wall 103 surrounds the periphery of the bottom plate 102 to form a bottom shell having an opening. The cover plate 101 is in sealing connection with the opening to form a sealed cavity in the shell 100. The battery cell 200 is arranged in the sealed cavity.

[0058] The first side wall 104 of the shell 100 comprises a first sub-wall and a second sub-wall adjacent to each other. The first side wall is provided with a first recessed portion 105 recessed toward the battery cell 200. The bottom surface of the first recessed portion 105 is located on a plane lower than the plane on which the second sub-wall is located.

[0059] The pole structure 300 is arranged outside the shell 100, and the pole structure 300 is located in the first recessed portion 105. In the recessed direction (x-axis shown in the figure) of the first recessed portion 105, the pole structure 300 comprises opposite first and second ends. The first end is close to the bottom surface of the first recessed portion 105, and the second end is away from the first recessed portion 105.

[0060] The first recessed portion 105 is provided with a first through hole 1051. The first end extends into the shell 100 through the first through hole 1051.

[0061] The battery cell 200 has a second side wall 203 opposite the first side wall 104 in the recess direction (x-axis shown in the figure) of the first recess 105; the second side wall 203 is provided with a first tab 201 and a second tab 202, and the first tab 201 and the second tab 202 are arranged in the width direction (y-axis shown in the figure) of the battery; the first tab 201 and the second tab 202 have opposite polarities, and the first tab 201 can be a positive tab and the second tab 202 can be a negative tab; in the present application, the first tab 201 is taken as a positive tab and the second tab 202 is taken as a negative tab for illustration.

[0062] The first end of the pole structure 300 is connected with the first tab 201, so that the pole structure 300 can lead out the positive electrode of the battery; at the same time, the second tab 202 is also connected with the second sub-wall, so that the shell 100 of the battery is negatively charged.

[0063] The plane in which the end face of the second end of the pole structure 300 is located does not exceed the plane in which the second sub-wall is located, so as to ensure that the pole structure 300 does not protrude from the first side wall 104.

[0064] That is, the present application sets the first recess 105 on the side wall of the shell 100, and sets the pole structure 300 leading out the positive electrode in the first recess 105, so as to avoid the pole structure 300 protruding from the side wall of the shell 100, thereby reducing the distance between the battery protection plate and the side wall of the shell 100, improving the space utilization of the battery, and improving the energy density of the battery.

[0065] In an embodiment, in the length direction of the battery, the distance between the first sub-wall and the first tab body is less than or equal to the distance between the second sub-wall and the second tab body, so as to fully utilize the space inside the shell 100, avoid waste of the space inside the shell 100, and effectively improve the energy density.

[0066] Reference Figure 3 and Figure 4 In the first embodiment of the present application, the pole structure 300 includes a pole body, which is a first pole body 3012; one end of the first pole body 3012 extends into the shell 100 from the first through hole 1051 and is connected with the first tab 201.

[0067] The other end of the first pole body 3012 includes a top cover 3011, and the top cover 3011 is located in the first recess 105; in the recess direction (x-axis shown in the figure) of the first recess 105, the top cover 3011 includes opposite first and second surfaces; the first surface is opposite to the bottom surface of the first recess 105, and the second surface is away from the bottom surface of the first recess 105.

[0068] The second surface is located in a plane lower than a plane in which the second sub-wall is located, that is, the first pole body 3012 does not protrude from the first side wall 104.

[0069] The pole structure 300 further comprises an outer insulation sheet 303 located in the first recess 105 and arranged between the first surface and the bottom surface of the first recess 105, and the outer insulation sheet 303 is used to prevent the top cover 3011 and the first side wall 104 of the shell 100 from directly contacting each other to cause a short circuit.

[0070] It should be noted that the outer insulation sheet 303 is further provided with a third through hole, and a central axis of the third through hole coincides with a central axis of the first through hole 1051, so that the first pole body 3012 extends into the shell 100 after sequentially passing through the third through hole and the first through hole 1051.

[0071] The surface of the outer insulation sheet 303, which is attached to the bottom surface of the first recess 105, is further provided with an annular flange 3031 extending towards the bottom surface of the first recess 105, and a central axis of the annular flange 3031 coincides with the central axis of the third through hole, and the annular flange 3031 extends into the shell 100 after passing through the first through hole 1051; when the first pole body 3012 extends into the shell 100 after sequentially passing through the third through hole and the first through hole 1051, the annular flange 3031 surrounds the outer periphery of the first pole body 3012, and is used to prevent the first pole body 3012 and the first side wall 104 of the shell 100 from directly contacting each other to cause a short circuit.

[0072] The outer insulation sheet 303 can comprise a polyester film (PET), a polyimide (PI) diaphragm, a polyvinyl chloride (PVC), a polyolefin (PO) heat shrink tube, a polypropylene (PP) diaphragm, a polyethylene (PE) diaphragm, rubber, or a silica gel, etc.

[0073] With reference to Figure 4 In the embodiment one of the present application, the outer insulation sheet 303 is further provided with at least two raised edges 3032 extending away from the bottom surface of the first recess 105, the at least two raised edges 3032 are opposite to each other in the width direction (y-axis shown in the figure) of the battery, the at least two raised edges 3032 surround the side peripheral wall of the top cover 3011 and abut against the side peripheral wall of the top cover 3011.

[0074] The at least two raised edges 3032 are used to limit the top cover 3011 and improve the connection stability of the first pole body 3012.

[0075] With reference to Figure 4 In the embodiment one of the present application, in the recess direction (x-axis shown in the figure) of the first recess 105, the projection of the outer insulation sheet 303 can cover the projection of the top cover 3011, so as to ensure that the top cover 3011 does not contact the first side wall 104.

[0076] Reference Figure 4 In the first recessed portion 105, the projection of the first recessed portion 105 and the projection of the first tab 201 do not coincide in the recessed direction (x-axis shown in the figure) of the first recessed portion 105, so that the first recessed portion 105 and the first tab 201 are staggered, thereby avoiding that the area occupied by the first recessed portion 105 on the first side wall 104 of the shell 100 is too large to affect the energy density of the battery.

[0077] It should be noted that, since the first tab 201 has a certain thickness, and the first recessed portion 105 is recessed towards the direction of the battery cell 200, the stagger of the first recessed portion 105 and the first tab 201 can also improve the space utilization of the battery, thereby improving the energy density of the battery.

[0078] Reference Figure 3 、 Figure 4 and Figure 7 In the first recessed portion 105, the projection of the first recessed portion 105 and the projection of the first tab 201 do not coincide in the recessed direction (x-axis shown in the figure) of the first recessed portion 105, so that the first recessed portion 105 and the first tab 201 are staggered, thereby avoiding that the area occupied by the first recessed portion 105 on the first side wall 104 of the shell 100 is too large to affect the energy density of the battery.

[0079] In the recessed direction (x-axis shown in the figure) of the first recessed portion 105, the first connecting segment 401 and the first recessed portion 105 are opposite, and the second connecting segment 402 and the second sub-wall are opposite.

[0080] The first connecting segment 401 is connected with the first end of the pole structure 300 extending into the shell 100, that is, connected with the first pole body 3012 extending into the shell 100; the second connecting segment 402 is connected with the first tab 201 of the battery cell 200; that is, the pole structure 300 and the first tab 201 are connected through the connecting sheet 400.

[0081] It should be noted that, since the first tab 201 has a certain thickness, and the first recessed portion 105 is recessed towards the direction of the battery cell 200, the stagger of the first recessed portion 105 and the first tab 201 can also improve the space utilization of the battery, thereby improving the energy density of the battery.

[0082] It should also be noted that, since the first recessed portion 105 and the second sub-wall are not in the same plane, the first connecting segment 401 and the second connecting segment 402 are also not in the same plane, and at this time the first connecting segment 401 and the second connecting segment 402 are connected through the intermediate adapter segment 403.

[0083] ReferenceFigure 8 In the first embodiment of the present application, the height difference h between the plane where the first connecting section 401 is located and the plane where the second connecting section 402 is located is 0.2-0.8mm, which can ensure that the pole structure 300 and the first tab 201 are connected, while avoiding excessive bending between the first connecting section 401 and the second connecting section 402 to affect the assembly difficulty.

[0084] Reference Figure 4 And Figure 7 In the first embodiment of the present application, the first connecting section 401 is provided with a second through hole 4011, and the first end of the pole structure 300 extending into the shell 100 is connected with the second through hole 4011; that is, the first pole body 3012 extending into the shell 100 is connected with the second through hole 4011.

[0085] At the same time, the first pole body 3012 extending into the shell 100 is also provided with an abutting flange 3013 along its radial direction, and the abutting flange 3013 abuts against the third surface of the first connecting section 401, which is close to the battery cell 200, so as to improve the connection strength between the connecting sheet 400 and the first pole body 3012.

[0086] Reference Figure 3 And Figure 4 In the first embodiment of the present application, the battery further comprises an inner insulating sheet 500, which is arranged in the shell 100 and between the connecting sheet 400 and the first side wall 104, so that the inner insulating sheet 500 can prevent the connecting sheet 400 and the first side wall 104 from directly contacting and causing short circuit.

[0087] Among them, the shape of the inner insulating sheet 500 is the same as that of the connecting sheet 400, which ensures the insulation effect of the inner insulating sheet 500.

[0088] Reference Figure 4 In the first embodiment of the present application, the projection of the inner insulating sheet 500 covers the projection of the connecting sheet 400 in the recess direction of the first recess 105 (the x-axis shown in the figure), that is, the edge of the inner insulating sheet 500 exceeds the edge of the connecting sheet 400 in the width direction of the battery (the y-axis shown in the figure) and the length direction of the battery (the x-axis shown in the figure), which ensures the insulation effect of the inner insulating sheet 500.

[0089] Among them, the projection of the inner insulating sheet 500 in the recess direction of the first recess 105 (the x-axis shown in the figure) has a first length, and the projection of the connecting sheet 400 in the recess direction of the first recess 105 has a second length, and the difference between the first length and the second length is >0.2mm. Under the premise of ensuring the insulation effect of the inner insulating sheet 500, it avoids that the inner insulating sheet 500 is too long to affect the assembly difficulty.

[0090] In the first embodiment of the present application, the inner insulation sheet 500 can include a polyimide (PI) diaphragm, a ceramic-coated diaphragm, a glass fiber diaphragm, a non-woven fabric diaphragm, a polypropylene (PP) diaphragm, a polyethylene (PE) diaphragm, rubber or silicone, etc.

[0091] With reference to Figure 4 In the first embodiment of the present application, in the recess direction of the first recess 105 (x-axis shown in the figure), the projection of the pole structure 300 on the first side wall 104 does not overlap with the projection of the first tab 201 on the first side wall 104, so that the pole structure 300 is staggered with the first tab 201, thereby reducing excessive space occupation in the recess direction of the first recess 105 and ensuring the utilization rate of the head space.

[0092] With reference to Figure 4 And Figure 7 In the first embodiment of the present application, the connecting corner between the first recess 105 and the second sub-wall is an arc-shaped corner, so that the corner position between the bottom surface of the first recess 105 and the second sub-wall is smoothly transitioned, reducing the risk of scratching the battery protection plate during installation.

[0093] The connecting corner between the intermediate adapter section 403 and the first connecting section 401 and the connecting corner between the intermediate adapter section 403 and the second connecting section 402 are arc-shaped corners, so that the corner position of the connecting sheet 400 is smoothly transitioned, thereby ensuring the structural stability of the connecting sheet 400 and preventing the connecting sheet 400 from being bent and broken.

[0094] The corner provided on the inner insulation sheet 500 is an arc-shaped corner, so that the corner position of the inner insulation sheet 500 is smoothly transitioned, improving the tensile strength of the inner insulation sheet 500.

[0095] With reference to Figure 4 In the first embodiment of the present application, the shell 100 further includes a third side wall intersecting with the first side wall 104, the first recess 105 is located at the edge of the first side wall 104 and close to the third side wall, and the connecting corner between the first recess 105 and the third side wall is also an arc-shaped corner, so that the corner position between the bottom surface of the first recess 105 and the third side wall is smoothly transitioned, reducing the risk of scratching the battery protection plate during installation.

[0096] With reference to Figure 5 And Figure 9In the second embodiment of the present application, the pole body can also be a second pole body 302, which is located in the first recessed portion 105. One end of the second pole body 302 extends from the first through hole 1051 into the housing 100 and is connected to the first pole tab 201; the plane where the end surface of the other end of the second pole body 302 is located is lower than the plane where the first side wall 104 is located, that is, the second pole body 302 does not protrude from the first side wall 104.

[0097] The outer periphery of the second pole body 302 is covered with an insulating layer, and the melting point of the insulating layer is greater than a first threshold value, which is the minimum value of the heat flow discharged after the thermal runaway of the battery cell 200 that can melt the battery cell 200.

[0098] The second electrode body 302 is used to lead out the positive electrode of the battery cell 200. The insulating layer surrounding the second electrode body 302 prevents direct contact between the second electrode body 302 and the first sidewall 104 of the housing 100, which could cause a short circuit. Furthermore, if the battery cell 200 within the housing 100 experiences thermal runaway, the high-temperature heat flow and the elevated temperature of the housing will melt the insulating layer, thereby providing pressure relief.

[0099] In the second embodiment of the present application, the insulating layer may include: a polypropylene (PP) film or a polyethylene (PE) film.

[0100] Continue to refer Figure 3 、 Figure 4 and Figure 5 In the first embodiment of the present application, the battery further includes: a sealing cover 600 , a liquid injection hole 1041 is provided on the second sub-wall, and the sealing cover 600 is sealedly connected to the liquid injection hole 1041 .

[0101] refer to Figure 6 Embodiment 1 of the present application also includes a battery device, which includes the battery described above and a battery protection board, the battery protection board includes a substrate 700 and a first conductive member 800 and a second conductive member 900 arranged on the fourth surface of the substrate 700.

[0102] The first conductive member 800 is connected to the end surface of the second end of the pole structure 300 , that is, connected to the top cover 3011 ; the second conductive member 900 is connected to the second sub-wall.

[0103] Since the thickness of the first conductive member 800 and the pole structure 300 is relatively large, the thickness space occupied by the connection position of the first conductive member 800 and the pole structure 300 is relatively large; therefore, the first conductive member 800 and the pole structure 300 located in the first recess 105 are connected so that the space occupied by the connection position of the first conductive member 800 and the pole structure 300 and the welding position of the second conductive member 900 and the second sub-wall are level.

[0104] refer toFigure 2 In the first embodiment of the present application, the cover plate 101 is provided with a first pressure relief notch 1011, and the thickness of the first pressure relief notch 1011 is less than the thickness of the cover plate 101 itself. The bottom plate 102 can also be provided with a second pressure relief notch 1021, and the thickness of the second pressure relief notch 1021 is less than the thickness of the bottom plate 102 itself.

[0105] When the internal pressure of the battery rises due to overcharging, short circuit or other faults, the first pressure relief notch 1011 and the second pressure relief notch 1021 can provide a predetermined breaking point, allowing the gas to be safely released, which can significantly reduce the risk of battery explosion and protect the safety of the user.

[0106] Reference Figures 10-14 Unlike the above-mentioned first embodiment, in the third embodiment of the present application, the second sub-wall is further provided with a second recessed portion 106 recessed toward the battery cell 200, and the second recessed portion 106 is spaced apart from the first recessed portion 105. The first side wall 104 between the second recessed portion 106 and the first recessed portion 105 is not recessed. The plane where the bottom surface of the second recessed portion 106 is located is lower than the plane where the bottom surface of the first recessed portion 105 is located, and the plane where the bottom surface of the second recessed portion 106 is located is higher than the plane where the bottom surface of the first recessed portion 105 is located.

[0107] When the pole structure 300 is arranged in the first recessed portion 105, the plane where the end surface of the second end of the pole structure 300 is located is lower than the horizontal plane where the first side wall 104 is located, ensuring that the pole structure 300 does not protrude from the first side wall 104.

[0108] The liquid injection hole 1041 is arranged in the second recessed portion 106, and when the sealing cover 600 is sealingly connected with the liquid injection hole 1041, the sealing cover 600 can be hidden in the second recessed portion 106, preventing the sealing cover 600 from protruding from the first side wall 104.

[0109] Reference Figure 14 In the third embodiment of the present application, in the recessed direction (x-axis shown in the figure) of the first recessed portion 105, the first tab 201 has a first projection, the second tab 202 has a second projection, the first recessed portion 105 has a third projection, and the second recessed portion 106 has a fourth projection. The first projection is located between the third projection and the fourth projection, and the second projection coincides with the fourth projection.

[0110] The projection of the second tab 202 on the first sidewall 104 of the shell 100 is located in the second recess 106, and the projection of the first tab 201 on the first sidewall 104 of the shell 100 is located on the first sidewall 104 between the second recess 106 and the first recess 105 without being provided with a recess, so that the first tab 201 and the second tab 202 are located in different areas, preventing the first tab 201 and the second tab 202 from moving and causing a short circuit.

[0111] Reference Figure 14 In addition, the third embodiment of the present application also includes a battery device, which comprises the battery as described above, and further comprises a battery protection plate, the battery protection plate comprising a substrate 700 and a first conductive part 800 and a second conductive part 900 provided on the fourth surface of the substrate 700.

[0112] The first conductive part 800 is connected to the end surface of the second end of the pole structure 300, that is, connected to the top cover 3011; and the second conductive part 900 is connected to the second recess 106.

[0113] When the pole structure 300 is arranged in the first recess 105, the plane where the end surface of the second end of the pole structure 300 is located is flush with the plane where the second recess 106 is located.

[0114] Since the thickness of the first conductive part 800 and the pole structure 300 is large, the thickness space occupied by the connection position of the first conductive part 800 and the pole structure 300 is large, so the first conductive part 800 is connected to the pole structure 300 arranged in the first recess 105; and since the plane where the end surface of the second end of the pole structure 300 is located is flush with the plane where the second recess 106 is located, the space occupied by the connection position of the first conductive part 800 and the pole structure 300 and the welding position of the second conductive part 900 and the second recess 106 is leveled.

[0115] It should be noted that, considering that the thickness space occupied by the connection position of the first conductive part 800 and the pole structure 300 and the connection position of the second conductive part 900 and the shell 100 is large, the first conductive part 800 and the second conductive part 900 are respectively arranged in the first recess 105 and the second recess 106, which effectively reduces the overall length of the battery protection plate and the battery cell 200.

[0116] In summary, the embodiment of the present application provides a battery and a battery device. The battery comprises a shell 100, a battery cell 200 and a pole structure 300. The battery cell 200 is arranged in the shell 100. The first side wall 104 of the shell 100 comprises an abutting first sub-wall and a second sub-wall. The first side wall is provided with a first recess 105 recessed towards the battery cell 200. The distance between the battery cell 200 and the first sub-wall is greater than the distance between the battery cell 200 and the second sub-wall. The pole structure 300 is arranged in the first recess 105. In the recess direction (x-axis shown in the figure) of the first recess 105, the pole structure 300 comprises opposite first and second ends. The first recess 105 is provided with a first through hole 1051. The first end extends into the shell 100 after passing through the first through hole 1051. The battery cell 200 has a second side wall 203. In the recess direction (x-axis shown in the figure) of the first recess 105, the second side wall 203 is opposite to the first side wall 104. The second side wall 203 is provided with a first tab 201 and a second tab 202. The polarities of the first tab 201 and the second tab 202 are opposite. The first end of the pole structure 300 is connected with the first tab 201, so that the pole structure 300 can lead out the positive electrode of the battery. At the same time, the second tab 202 is also connected with the second sub-wall, so that the shell 100 of the battery is negatively charged. The plane in which the end face of the second end of the pole structure 300 is located does not exceed the plane in which the first side wall 104 is located, so as to ensure that the pole structure 300 does not protrude from the first side wall 104.

[0117] By arranging the first recess 105 on the side wall of the shell 100 and arranging the pole structure 300 leading out the positive electrode in the first recess 105, the pole structure 300 is prevented from protruding from the side wall of the shell 100, thereby reducing the distance between the battery protection plate and the side wall of the shell 100, improving the space utilization of the battery and improving the energy density of the battery.

[0118] At the same time, the distance between the battery cell 200 and the first sub-wall is greater than the distance between the battery cell 200 and the second sub-wall, so as to fully utilize the space inside the shell 100, avoid waste of the space inside the shell 100 and further improve the energy density.

[0119] The embodiments in the specification or the embodiments are described in a progressive manner. Each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0120] It should be noted that the use of "one embodiment," "an embodiment," "certain embodiments," "some embodiments," "exemplary embodiment," "one specific embodiment," or "some implementations" in the specification, including in the claims, indicates that the feature(s) described can include a particular feature, structure, or characteristic, but every occurrence of such terms does not necessarily refer to the same embodiment, and such terms explicitly include "combination(s)" of the specified features, structure or characteristic. Moreover, such terms can refer to "all or some" or "each or some" of the items listed.

[0121] In general, terminology can be understood at least in part from usage in context. For example, terms, such as "one or more" as used herein, can be taken to mean that at least one, or there is equivalent to at least one, and that there are one or more orders of multiplication with respect to any feature, structure, or characteristic described. Terms, such as "a" or "an" as used herein, can be taken to mean one or more or the equivalent of one or more, but not including or precluding the other. Terms, such as "another," can be taken to mean one or more, that is, any feature, structure, or characteristic described can include one or more instances of the feature, structure or characteristic. Furthermore, such terms as "including" and "having," as well as variations thereof, are intended to be broad and encompass the terms "consisting of" and "consisting essentially of."

[0122] It will be readily apparent to those skilled in the art that "on," "above," and "upper" in the present disclosure can each be interpreted to mean not only "directly on" but also "in" something, with intervening features or layers, and that "above" or "upper" can each mean not only "above" or "upper" something but also "directly above" or "directly upper," that is, without intervening features or layers.

[0123] In addition, spatially relative terms, such as "beneath," "below," "lower," "above," "upper," and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0124] Finally, it should be noted that the above-described embodiments are merely intended for describing and illustrating the technical solutions of the present application, but are not intended to limit the present application; even though the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that they can still make modifications to the technical solutions recorded in the above-described embodiments, or make equivalent replacements to some or all of the technical features; and such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: include: Shell, cell and pole structure; The battery cell is arranged in the housing, and the battery cell includes a first pole piece, a diaphragm, and a second pole piece. The first pole piece includes a first pole piece body and a first pole lug extending from a side edge of the first pole piece body. The second pole piece includes a second pole piece body and a second pole lug extending from a side edge of the second pole piece body. The first side wall of the housing includes a first sub-wall and a second sub-wall adjacent to each other, and a first recessed portion is formed on the first sub-wall and is recessed toward the battery cell; The pole structure is arranged in the first recessed portion. In the recessed direction of the first recessed portion, the pole structure includes a first end and a second end opposite to each other. The first end passes through a first through hole provided in the first recessed portion and extends into the housing to be connected to the first tab of the battery cell. The plane where the end surface of the second end is located does not exceed the plane where the second sub-wall is located; The polarity of the second electrode tab of the battery cell is opposite to that of the first electrode tab, and the second electrode tab is connected to the second sub-wall.

2. The battery according to claim 1, characterized in that The pole structure includes: a pole body; One end of the pole body extends into the housing from the first through hole and is connected to the first pole tab; The outer periphery of the pole body is covered with an insulating layer; and / or, The other end of the pole body has a top cover, and in the recessed direction of the first recessed portion, a first surface of the top cover is opposite to the bottom surface of the first recessed portion, an outer insulating sheet is provided between the first surface and the bottom surface of the first recessed portion, and an annular flange is provided on the outer insulating sheet extending toward the bottom surface of the first recessed portion, and the annular flange surrounds the outer circumference of the pole body; and / or, The outer insulating sheet is provided with at least two convex edges extending away from the bottom surface of the first recessed portion, and the at least two convex edges surround the side peripheral wall of the top cover.

3. The battery according to claim 1, characterized in that The battery further comprises: a connecting piece; The connecting piece is arranged in the housing, and includes a first connecting section, an intermediate transition section, and a second connecting section, wherein both ends of the intermediate transition section are connected to the first connecting section and the second connecting section respectively; In the concave direction of the first concave portion, the first connecting section and the first concave portion are opposite to each other, and the second connecting section and the second sub-wall are opposite to each other; The first connecting section is connected to the first end, and the second connecting section is connected to the first electrode tab.

4. The battery according to claim 3, characterized in that The height difference h between the plane where the first connecting section is located and the plane where the second connecting section is located is 0.2-0.8 mm, and / or, in the length direction of the battery, the distance between the first sub-wall and the first pole piece body is less than or equal to the distance between the second sub-wall and the second pole piece body.

5. The battery according to claim 3, characterized in that The battery further comprises: an inner insulating sheet; The inner insulating sheet is disposed in the housing, and the inner insulating sheet is disposed between the connecting sheet and the first side wall.

6. The battery according to claim 5, characterized in that The projection of the inner insulating sheet in the recessed direction of the first recessed portion has a first length, the projection of the connecting sheet in the recessed direction of the first recessed portion has a second length, and the difference between the first length and the second length is greater than 0.2 mm.

7. The battery according to claim 5, characterized in that In the recessed direction of the first recessed portion, the projection of the inner insulating sheet covers the projection of the connecting sheet; and / or, The projection of the first recessed portion does not overlap with the projection of the first tab; and / or, A projection of the pole structure on the first side wall does not overlap with a projection of the first pole tab on the first side wall.

8. The battery according to claim 3, characterized in that The connecting corner between the first sub-wall and the second sub-wall is a curved corner; and / or, The connecting corner between the intermediate transition section and the first connecting section and the connecting corner between the intermediate transition section and the second connecting section are both arc-shaped corners.

9. The battery according to claim 1, characterized in that The battery further comprises: a sealing cover; A second recessed portion is formed on the second sub-wall and is recessed toward the battery cell. The second recessed portion is spaced apart from the first recessed portion, and a plane where an end surface of the second end is located is flush with a plane where the second recessed portion is located. In the concave direction of the first concave portion, the first electrode tab has a first projection, the second electrode tab has a second projection, the first concave portion has a third projection, and the second concave portion has a fourth projection; The first projection is located between the third projection and the fourth projection, and the second projection coincides with the fourth projection; The second recessed portion is provided with a liquid injection hole, and the sealing cover is sealedly connected to the liquid injection hole.

10. A battery device, characterized in that: A battery according to any one of claims 1 to 9, further comprising a battery protection plate; The battery protection board includes a substrate and a first conductive member and a second conductive member provided on the substrate, wherein the first conductive member is connected to the second end of the pole structure; The second conductive member is connected to the second sub-wall; or, The second conductive member is connected in the second recess.

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