Hard-shell battery

Abstract

The utility model discloses a hard-shell battery. The hard-shell battery comprises a battery cell assembly and a shell assembly, the battery cell assembly comprises an anode pole piece group and a cathode pole piece group which are arranged in a laminated manner. The shell assembly defines a first inner cavity, the battery cell assembly is arranged in the first inner cavity, the shell assembly is provided with an air guide channel, and the air guide channel is communicated with the first inner cavity. Wherein in the first direction, the anode pole piece group and the cathode pole piece group are arranged in a laminated manner, and in the first direction, the gas guide channel is positioned on one side of the battery cell assembly. According to the hard-shell battery, the air guide channel is positioned on one side of the battery cell assembly along the first direction, so that when the battery cell assembly is heated to expand and generate high temperature and high pressure, the high temperature and high pressure generated by the battery cell assembly along the stacking direction are exhausted through the air guide channel, the exhaust rate of the hard-shell battery is improved, and the hard-shell battery is prevented from generating thermal failure.

Description

Technical Field

[0001] The present application relates to the technical field of hard shell batteries, and in particular to a hard shell battery. Background Art

[0002] In modern society, the use and storage of energy are developing rapidly, especially electrochemical energy storage. As a new type of secondary hard-shell battery, lithium-ion hard-shell battery has the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and green environmental protection. It has broad application prospects in portable appliances, power tools, large-scale energy storage, electric transportation power supply, etc.

[0003] At present, the volume of the negative electrode changes greatly during the discharge process of the hard-shell battery, which makes it difficult to effectively suppress the expansion of the soft-pack hard-shell battery, which brings certain difficulties to the manufacture and application of the hard-shell battery. In the prior art, by replacing the hard-shell battery shell with a hard shell with a certain strength, the side frame of the hard shell can be used to suppress the expansion, thereby improving the performance and stability of the hard-shell battery to a certain extent. The stack is placed in a steel shell to form a hard-shell battery. Since the thermal expansion of the stacked battery is prone to high temperature and high pressure, the high temperature and high pressure are difficult to discharge in the hard shell, resulting in thermal failure of the battery. The existing hard-shell battery structure can no longer meet the safety requirements. Utility Model Content

[0004] The main purpose of this application is to propose a hard shell battery, which aims to solve the technical problem that the thermal expansion of laminated batteries easily generates high temperature and high pressure, which is difficult to discharge in the hard shell, resulting in thermal failure of the battery, and the existing hard shell battery structure can no longer meet the safety requirements.

[0005] To achieve the above objectives, the first aspect of the present application provides a hard shell battery, the hard shell battery comprising:

[0006] A battery cell assembly, the battery cell assembly comprising an anode electrode group and a cathode electrode group arranged in a stacked manner;

[0007] A shell assembly, wherein the shell assembly defines a first inner cavity, the battery cell assembly is disposed in the first inner cavity, and the shell assembly is provided with an air guide channel, the air guide channel communicating with the first inner cavity;

[0008] Wherein, along the first direction, the anode electrode group and the cathode electrode group are stacked and arranged, and along the first direction, the air guide channel is located on one side of the battery cell assembly.

[0009] In some embodiments, the shell assembly includes a blocking portion, which is disposed in the air guiding channel to block the air guiding channel, and the blocking portion is configured to be pushed away from the air guiding channel after obtaining pressure provided by the battery cell assembly along the first direction.

[0010] In some embodiments, the hard shell battery includes a pole ear assembly, the second direction is set to be a direction perpendicular to the first direction, along the second direction, the pole ear assembly is arranged on one side of the battery cell assembly, the pole ear assembly is connected to the battery cell assembly, and along the second direction, the air guide channel is adjacent to one side of the pole ear assembly.

[0011] In some embodiments, the tab assembly includes an anode tab and a cathode tab, the anode tab is connected to the anode plate group, the cathode tab is connected to the cathode plate group, and the anode tab and the cathode tab are arranged with intervals along the first direction. The distance from the air guide channel to the anode tab is A, and the distance from the air guide channel to the cathode tab is B. The distance A and the distance B satisfy: A<B.

[0012] In some embodiments, along the second direction, the gas guiding channel is adjacent to one side of the anode tab.

[0013] In some embodiments, the third direction is set to be a direction perpendicular to the first direction and the second direction, and along the third direction, the gas guide channel is adjacent to one side of the anode ear.

[0014] In some embodiments, the projection plane is a plane perpendicular to the first direction, the gas guide channel forms a first orthographic projection on the projection plane, the anode ear forms a second orthographic projection on the projection plane, and the first orthographic projection coincides with the second orthographic projection.

[0015] In some embodiments, the first inner cavity forms a third orthographic projection on the projection plane, the anode tab includes a plurality of anode pole sheets, the area of ​​the third orthographic projection is S, the silicon content of the hard shell battery is A, the tensile strength of the shell assembly is M, the number of layers of the anode pole sheets is C, and the area S, the silicon content A, the number of layers of the anode pole sheets C and the tensile strength M satisfy: M≥4A*100*C / S.

[0016] In some embodiments, the area S, the silicon content A, the number of anode electrode layers C and the tensile strength M satisfy: M>4.4492A*100*C / S.

[0017] In some embodiments, the hard shell battery includes a current collecting assembly, the current collecting assembly includes an anode current collecting portion and a cathode current collecting portion, the current collecting assembly defines a third inner cavity, the anode current collecting portion has a first wall surface, the cathode current collecting portion has a second wall surface, and along the second direction, the first wall surface and the second wall surface are arranged opposite to each other;

[0018] Wherein, the anode electrode plate group includes a plurality of anode electrode plates, each of which is arranged one by one along a first direction perpendicular to the second direction, and each of which is connected to the first wall; the cathode electrode plate group includes a plurality of cathode electrode plates, each of which has a different polarity from each of the anode electrode plates, each of which is arranged alternately and stacked with each of the anode electrode plates, and each of which is connected to the second wall; the anode electrode plate includes two first straight pieces, each of which is connected to each other at one end close to the second wall, and each of which is connected to the first wall at one end close to the first wall; the cathode electrode plate includes two second straight pieces, each of which is connected to each other at one end close to the first wall, and each of which is connected to the second wall at one end close to the second wall.

[0019] In some embodiments, the hard shell battery includes a limit assembly, the limit assembly is arranged in the first inner cavity, the limit assembly defines a second inner cavity, the limit assembly is provided with a first through hole, the axis of the first through hole is parallel to the third direction, the limit assembly is provided with a second through hole, the axis of the second through hole is parallel to the first direction, the first through hole and the second through hole are connected to the second inner cavity, and the battery cell assembly is arranged in the second inner cavity.

[0020] In some embodiments, along the second direction, the tab assembly is disposed on a side of the anode current collecting portion away from the cathode current collecting portion, the anode current collecting portion includes a first end portion, the first end portion abuts against the cathode tab, and the current collecting assembly includes an insulating portion, the insulating portion is disposed between the first end portion and the anode current collecting portion;

[0021] or,

[0022] Along the second direction, the tab assembly is arranged on the side of the cathode current collecting portion away from the anode current collecting portion, the cathode current collecting portion includes a second end portion, the second end portion abuts against the anode tab, and the current collecting assembly includes an insulating portion, which is arranged between the second end portion and the cathode current collecting portion.

[0023] In some embodiments, along the first direction, the cathode current collecting portion is at least partially located on one side of the battery cell assembly, along the first direction, the battery cell assembly includes a third end portion, and the insulating portion is partially disposed between the cathode current collecting portion and the third end portion;

[0024] or,

[0025] Along the first direction, the anode current collecting portion is at least partially located on one side of the battery cell assembly. Along the first direction, the battery cell assembly includes a third end portion, and the insulating portion is partially disposed between the anode current collecting portion and the third end portion.

[0026] Compared with the prior art, the beneficial effects of this application are:

[0027] In the technical solution of the present application, a hard shell battery is proposed, and the hard shell battery includes a cell assembly and a shell assembly. The cell assembly includes an anode electrode sheet group and a cathode electrode sheet group arranged in a stacked manner. The shell assembly defines a first inner cavity, and the cell assembly is arranged in the first inner cavity. The shell assembly is provided with an air guide channel, and the air guide channel communicates with the first inner cavity. Among them, along the first direction, the anode electrode sheet group and the cathode electrode sheet group are stacked, and along the first direction, the air guide channel is located on one side of the cell assembly. In the present application, the air guide channel is located on one side of the cell assembly along the first direction, so that when the cell assembly is heated and expanded to generate high temperature and high pressure, the high temperature and high pressure generated by the cell assembly along the stacking direction is discharged through the air guide channel, thereby improving the exhaust rate of the hard shell battery, preventing the hard shell battery from thermal failure, and improving the safety performance of the hard shell battery. In the present application, by arranging the cell assembly in the shell assembly, the side frame of the steel shell is used to suppress the expansion of the cell assembly, prevent the cell assembly from being damaged, and improve the safety performance of the hard shell battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0029] Figure 1 It is a cross-sectional schematic diagram of the first hard shell battery in the embodiment of the present application; wherein the figure shows a battery cell assembly, a shell assembly, a tab assembly and a current collecting assembly, and along the first direction, the cathode current collecting portion is at least partially located on one side of the battery cell assembly;

[0030] Figure 2 It is a cross-sectional schematic diagram of part of the second hard shell battery in the embodiment of the present application; wherein the figure shows a battery cell assembly, a shell assembly, a tab assembly and a current collecting assembly, and along the first direction, the anode current collecting portion is at least partially located on one side of the battery cell assembly;

[0031] Figure 3 It is a cross-sectional schematic diagram of part of the third hard shell battery in the embodiment of the present application; wherein the current collecting assembly includes a blocking portion;

[0032] Figure 4It is a schematic cross-sectional view of part of the fourth hard shell battery in the embodiment of the present application; wherein the current collecting assembly includes a blocking portion, and along the first direction, the anode current collecting portion is at least partially located on one side of the battery cell assembly;

[0033] Figure 5 It is a cross-sectional schematic diagram of part of the fourth hard shell battery in the embodiment of the present application; wherein the figure shows the third direction Z;

[0034] Figure 6 This is a cross-sectional schematic diagram of the fifth hard-shell battery in the embodiment of the present application; wherein the limiting assembly is shown;

[0035] Figure 7 It is a cross-sectional schematic diagram of the sixth hard shell battery in the embodiment of the present application; wherein, the figure shows a limit assembly, which includes a second inner cavity, a first through hole and a second through hole.

[0036] Description of Figure Numbers:

[0037] Hard case battery 10;

[0038] Battery cell assembly 100;

[0039] Anode electrode set 110;

[0040] Anode pole piece 111;

[0041] A first straight member 1111;

[0042] Cathode electrode assembly 120;

[0043] Cathode pole piece 121;

[0044] A second straight member 1211;

[0045] A third end portion 130;

[0046] Housing assembly 200;

[0047] A first inner cavity 210;

[0048] Air guide channel 220;

[0049] A blocking portion 230;

[0050] Tab assembly 300;

[0051] Anode lug 310;

[0052] Cathode tab 320;

[0053] Current collecting assembly 400;

[0054] Anode current collecting portion 410;

[0055] A first wall 411;

[0056] A first end portion 412;

[0057] Cathode current collecting portion 420;

[0058] Second wall 421;

[0059] A second end portion 422;

[0060] A third inner cavity 430;

[0061] Insulation portion 440;

[0062] Limiting assembly 500;

[0063] A second inner cavity 510;

[0064] A first through hole 520;

[0065] A second through hole 530;

[0066] First direction X;

[0067] The second direction Y;

[0068] The third direction Z.

[0069] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiment is only a component embodiment of the present application, rather than an embodiment of the entire component. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0071] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0072] In addition, when an element is said to be "fixed to" another element, it can be directly on the other element, or one or more intervening elements can exist between them. When an element is said to be "connected to" another element, it can be directly connected to the other element, or one or more intervening elements can exist between them.

[0073] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or", "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0074] At present, the volume of the negative electrode changes greatly during the discharge process of the hard-shell battery, which makes it difficult to effectively suppress the expansion of the soft-pack hard-shell battery, which brings certain difficulties to the manufacture and application of the hard-shell battery. In the prior art, by replacing the hard-shell battery shell with a hard shell with a certain strength, the side frame of the hard shell can be used to suppress the expansion, thereby improving the performance and stability of the hard-shell battery to a certain extent. The stack is placed in a steel shell to form a hard-shell battery. Since the thermal expansion of the stacked battery is prone to high temperature and high pressure, the high temperature and high pressure are difficult to discharge in the hard shell, resulting in thermal failure of the battery. The existing hard-shell battery structure can no longer meet the safety requirements.

[0075] The first aspect of the present application provides a hard shell battery 10, which includes a battery cell assembly 100 and a shell assembly 200. In some embodiments, the hard shell battery 10 is a lithium hard shell battery 10.

[0076] The battery cell assembly 100 includes an anode electrode group 110 and a cathode electrode group 120. The anode electrode group 110 includes a plurality of anode electrode sheets 111. For example, the anode electrode sheets 111 can be provided in two, three, four, etc. The cathode electrode sheets 121 can be provided in two, three, four, etc. The polarity of each cathode electrode sheet 121 is different from that of each anode electrode sheet 111.

[0077] The hard shell battery 10 includes a shell assembly 200, and the outer contour of the shell assembly 200 can be in a variety of structures. In some embodiments, the shell assembly 200 can be a rectangular parallelepiped. In other embodiments, the shell assembly 200 can be a polygon, etc., depending on the actual situation. The embodiment of the present application takes the rectangular parallelepiped shell assembly 200 as an example. The shell assembly 200 is used to provide support for the hard shell battery 10 to limit the expansion of the hard shell battery 10, so the shell assembly 200 has a high rigidity. In some embodiments, the material of the shell assembly 200 includes metal. In other embodiments, the material of the shell assembly 200 includes alloy. Further, the material of the shell assembly 200 includes stainless steel to provide high rigidity and strong sealing. The shell assembly 200 defines a first inner cavity 210. In some embodiments, the first inner cavity 210 has a high airtightness, so that in the working state, the battery cell assembly 100 is separated from the outside world to protect the normal operation of the battery cell assembly 100 of the hard shell battery 10. It should be noted that in the working state, if the battery cell assembly 100 expands, and because of the nature of the laminated battery cell, the battery cell assembly 100 expands in the stacking direction, that is, the battery cell assembly 100 expands along the first direction X to abut the shell assembly 200, and the shell assembly 200 provides support for the battery cell assembly 100 to suppress the deformation failure of the battery cell assembly 100 caused by the expansion of the battery cell assembly 100, so as to ensure the normal operation of the hard shell battery 10. In some embodiments, the shell assembly 200 includes a shell side plate, a shell bottom plate, and a shell upper plate, and the shell side plate is configured to abut the battery cell assembly 100 when the battery cell assembly 100 expands. Furthermore, the shell side plate is integrally formed to make the shell side plate have a higher strength, and the shell side plate can provide a higher support force to the battery cell assembly 100 to further ensure the normal operation of the hard shell battery 10.

[0078] The shell assembly 200 is provided with an air guide channel 220, and the outer contour of the air guide channel 220 can be in a variety of structures. In some embodiments, the air guide channel 220 can be a rectangular parallelepiped. In other embodiments, the air guide channel 220 can be a polygon, etc. In other embodiments, the air guide channel 220 can be a cylinder, etc. It depends on the actual situation. The embodiment of the present application takes the cylindrical air guide channel 220 as an example. The air guide channel 220 is connected to the first inner cavity 210. The air guide channel 220 is used to discharge the high-temperature and high-pressure gas generated by the heat of the battery cell assembly 100 when the battery cell assembly 100 is expanded and damaged, so as to prevent the hard shell battery 10 from exploding and causing damage to the hard shell battery 10. Since the battery cell assembly 100 is in the first inner cavity 210, along the first direction X, the air guide channel 220 is located on one side of the battery cell assembly 100. It should be noted that in the working state, if the battery cell assembly 100 expands to the point of being damaged, due to the nature of the laminated battery cell, the battery cell assembly 100 generates more high-temperature and high-pressure gas along the stack, that is, the battery cell assembly 100 expands along the first direction X to generate more high-temperature and high-pressure gas. By arranging the air guide channel 220 along the first direction X on one side of the battery cell assembly 100, the high-temperature and high-pressure gas generated by the heat of the battery cell assembly 100 can be quickly discharged to protect the normal operation of the hard shell battery 10.

[0079] The shell assembly 200 includes a blocking portion 230, and the outer contour of the blocking portion 230 can be in a variety of structures. In some embodiments, the blocking portion 230 can be a rectangular parallelepiped. In other embodiments, the blocking portion 230 can be a polygon, etc. In other embodiments, the blocking portion 230 can be a cylinder, etc. It depends on the actual situation. The embodiment of the present application takes the cylindrical blocking portion 230 as an example. The blocking portion 230 is arranged in the gas guide channel 220 to block the gas guide channel 220. The blocking portion 230 is configured to be pushed away from the gas guide channel 220 after obtaining the pressure provided by the battery cell assembly 100 along the first direction X, and when the battery cell assembly 100 does not generate high-temperature and high-pressure gas, the first inner cavity 210 is separated from the outside world, so as to ensure the normal operation of the hard shell battery 10, and when the battery cell assembly 100 generates high-temperature and high-pressure gas, the first inner cavity 210 is connected to the outside world.

[0080] In some embodiments, the housing assembly 200 includes a tab assembly 300, and the tab assembly 300 is used to connect the current collecting assembly 400. In some embodiments, the tab assembly 300 is disposed on the housing upper plate. It should be noted that in order to ensure that the housing assembly 200 has a high strength at one end abutting against the battery cell assembly 100, along the second direction Y, the tab assembly 300 is disposed on the side of the current collecting assembly 400 away from the battery cell assembly 100 to ensure that the housing assembly 200 has a high strength.

[0081] The tab assembly 300 includes an anode tab 310 and a cathode tab 320. The anode tab 310 and the cathode tab 320 are arranged at intervals along the first direction X. The anode tab 310 is connected to the anode current collector 410, and the cathode tab 320 is connected to the cathode current collector 420. The distance from the air guide channel 220 to the anode tab 310 is A, and the distance from the air guide channel 220 to the cathode tab 320 is B. The distance A and the distance B satisfy: A<B, so that the air guide channel 220 is close to the anode tab 310. For example, the distance A and the distance B can satisfy 2A=B, 3A=B, 4A=B, etc. Since the high temperature and high pressure generated by the anode tab 310 is greater than that generated by the cathode tab 320 when the hard shell battery 10 expands thermally, thermal failure may easily occur. Therefore, the air guide channel 220 is placed close to the anode tab 310 to discharge the high temperature and high pressure generated by the anode tab 310 through the air guide channel 220, thereby improving the exhaust rate of the hard shell battery 10 and improving the safety performance of the hard shell battery 10.

[0082] In some embodiments, along the second direction Y and the third direction Z, the gas guide channel 220 is adjacent to one side of the anode tab 310 to further enable rapid discharge of high-temperature and high-pressure gas generated by the heating of the battery cell assembly 100 , thereby further protecting the normal operation of the hard shell battery 10 .

[0083] The meaning of "along the second direction Y, the side of the air guide channel 220 adjacent to the anode tab 310" is defined below: the plane perpendicular to the second direction Y is the first plane, and the distances from the two opposite outermost end points of the housing assembly 200 along the second direction Y to the first plane are equal. Along the second direction Y, the air guide channel 220 is located on the side of the first plane facing the anode current collecting portion 410.

[0084] It should be noted that in the working state, if the battery cell assembly 100 expands to the point of being damaged, due to the nature of the stacked battery cells, the battery cell assembly 100 generates more high-temperature and high-pressure gases along the stack, and the volume of the gas generated at the anode ear 310 is greater than the volume of the gas generated at the cathode ear 320, that is, the battery cell assembly 100 generates more high-temperature and high-pressure gases at the anode ear 310. By placing the gas guide channel 220 along the second direction Y, close to one side of the anode ear 310, the high-temperature and high-pressure gases generated by the heat of the battery cell assembly 100 can be quickly discharged to protect the normal operation of the hard shell battery 10.

[0085] The third direction Z is set to be a direction perpendicular to the first direction X and the second direction Y. Along the third direction Z, the gas guide channel 220 is adjacent to one side of the anode tab 310 .

[0086] The meaning of "along the third direction Z, the side of the gas guide channel 220 adjacent to the anode tab 310" is defined below: the plane perpendicular to the third direction Z is the second plane, and the distances from the two opposite outermost endpoints of the housing assembly 200 along the third direction Z to the second plane are equal. Along the third direction Z, the gas guide channel 220 is located on the side of the second plane facing the anode tab 310.

[0087] It should be noted that when the battery cell assembly 100 expands to the point of being damaged and generating gas, the volume of the gas generated at the anode ear 310 is greater than the volume of the gas generated at the cathode ear 320, that is, the battery cell assembly 100 generates more high-temperature and high-pressure gas at the anode ear 310. By placing the gas guide channel 220 along the third direction Z, close to one side of the anode ear 310, the high-temperature and high-pressure gas generated by the heat of the battery cell assembly 100 can be quickly discharged to protect the normal operation of the hard shell battery 10.

[0088] In some embodiments, the projection plane is a plane perpendicular to the first direction X, the air guide channel 220 forms a first orthographic projection on the projection plane, the anode tab 310 forms a second orthographic projection on the projection plane, and the first orthographic projection overlaps the second orthographic projection. By making the first orthographic projection formed by the air guide channel 220 and the second orthographic projection formed by the anode tab 310, that is, the air guide channel 220 is arranged on one side of the anode tab 310 along the first direction X, when the battery cell assembly 100 expands to the point of damage and generates gas, the rate of extracting the gas generated by the anode tab 310 is further increased, and the normal operation of the hard shell battery 10 is further protected.

[0089] The first inner cavity 210 forms a third orthographic projection on the projection plane, the area of ​​the third orthographic projection is S, the silicon content of the hard shell battery 10 is A, the tensile strength of the shell assembly 200 is M, the number of layers of the anode electrode is C, and the area S, the silicon content A, and the tensile strength M satisfy: M≥4A*100*C / S. Exemplarily, the tensile strength M can be 4A*100*C / S, 5A*100*C / S, 6A*100*C / S, 7A*100*C / S, and so on. It should be noted that the tensile strength M of the shell assembly 200 should be moderate. Due to the expansion of the battery cell assembly 100, the shell assembly 200 needs to provide support. When the tensile strength M of the shell assembly 200 is low, the shell assembly 200 is easily damaged. When the tensile strength M of the shell assembly 200 is high, although the shell assembly 200 meets the requirements of protecting the battery cell assembly 100, the processing and manufacturing cost of the shell assembly 200 is high, resulting in a high production cost of the hard shell battery 10, reducing the economic benefits of the hard shell battery 10.

[0090] In some embodiments, the area S, the silicon content A, the number of anode sheet layers C, and the tensile strength M satisfy: M>4.4492A*100*C / S. For example, the tensile strength M may be 5A*100*C / S, 6A*100*C / S, 7A*100*C / S, and so on.

[0091] The current collecting assembly 400 includes an anode current collecting portion 410 and a cathode current collecting portion 420. The outer contour of the anode current collecting portion 410 can be in a variety of structures. In some embodiments, the anode current collecting portion 410 can be a rectangular parallelepiped. In other embodiments, the anode current collecting portion 410 can be a polygon, etc., depending on the actual situation. The embodiment of the present application takes the rectangular parallelepiped anode current collecting portion 410 as an example. The outer contour of the cathode current collecting portion 420 can also be in a variety of structures. In some embodiments, the cathode current collecting portion 420 can be a rectangular parallelepiped. In other embodiments, the cathode current collecting portion 420 can be a polygon, etc., depending on the actual situation. The embodiment of the present application takes the rectangular parallelepiped cathode current collecting portion 420 as an example. The current collecting assembly 400 defines a third inner cavity 430. The anode current collecting portion 410 has a first wall 411, and the cathode current collecting portion 420 has a second wall 421. Along the second direction Y, the first wall 411 and the second wall 421 are arranged relative to each other. In some embodiments, the first wall surface 411 is perpendicular to the second direction Y. In some embodiments, the second wall surface 421 is perpendicular to the second direction Y.

[0092] Each anode electrode piece 111 is arranged one by one along the first direction X perpendicular to the second direction Y. It should be noted that each anode electrode piece 111 can be arranged at uniform intervals or non-uniform intervals. Each anode electrode piece 111 is connected to the first wall surface 411, that is, each anode electrode piece 111 is electrically connected to the anode current collecting portion 410. The cathode electrode piece group 120 includes a plurality of cathode electrode pieces 121. Exemplarily, each cathode electrode piece 121 is arranged one by one in an alternating and stacked manner with each anode electrode piece 111, that is, each cathode electrode piece 121 is arranged at intervals along the first direction X, and each cathode electrode piece 121 is staggered with each anode electrode piece 111. It should be noted that each cathode electrode piece 121 can be arranged at uniform intervals or non-uniform intervals. Each cathode electrode piece 121 is connected to the second wall surface 421, that is, each cathode electrode piece 121 is electrically connected to the cathode current collecting portion 420. The anode electrode sheet 111 includes two first straight pieces 1111, and the first straight pieces 1111 extend in any direction perpendicular to the first direction X. The outer contour of the first straight piece 1111 can be in a variety of structures. In some embodiments, the first straight piece 1111 can be a rectangular parallelepiped. In other embodiments, the first straight piece 1111 can be a polygon, etc., depending on the actual situation. The embodiment of the present application takes the rectangular first straight piece 1111 as an example. The ends of the first straight pieces 1111 close to the second wall 421 are connected to each other. In some embodiments, along the first direction X, the ends of the first straight portions close to the second wall 421 are connected in pairs. The ends of the first straight portions close to the first wall 411 are respectively connected to the first wall 411. Further, the ends of the first straight portions close to the first wall 411 are respectively abutted against the first wall 411. The cathode electrode piece 121 includes two second straight pieces 1211, and the second straight pieces 1211 extend in any direction perpendicular to the first direction X. The outer contour of the second straight piece 1211 can be in a variety of structures. In some embodiments, the second straight piece 1211 can be a rectangular parallelepiped. In other embodiments, the second straight piece 1211 can be a polygon, etc., depending on the actual situation. The embodiment of the present application takes the rectangular second straight piece 1211 as an example.

[0093] In some embodiments, the second straight member 1211 has the same outer contour as the first straight member 1111. One end of each second straight member 1211 close to the first wall 411 is connected to each other. In some embodiments, along the first direction X, one end of each second straight portion close to the first wall 411 is connected in pairs. One end of each second straight member 1211 close to the second wall 421 is connected to the second wall 421. Further, one end of each second straight portion close to the second wall 421 is abutted against the second wall 421. In some embodiments, the first wall 411 and the second wall 421 are plane walls to ensure that each first straight portion is stably connected to the first wall 411, and each second straight portion is stably connected to the second wall 421. The anode current collector 410 compresses the anode pole piece 111 along the second direction Y, and the cathode current collector 420 compresses the cathode pole piece 121 in the opposite direction of the second direction Y, so that the limiting component limits the width of the battery cell assembly 100, ensuring that the battery cell assembly 100 is adapted to the shell assembly 200, and there is no need to control the width of the pole piece, so as to ensure that the energy density of the hard shell battery 10 remains unchanged, reduce the manufacturing complexity of the battery cell assembly 100, and reduce the production cost of the hard shell battery 10, so as to improve the economic benefits of the hard shell battery 10. In addition, the anode current collector 410 and the cathode current collector 420 are configured to be conductive, so that when the hard shell battery 10 is working, the anode current collector 410 can electrically connect the anode pole pieces 111, and the cathode current collector 420 can electrically connect the cathode pole pieces 121, further improving the discharge efficiency of the hard shell battery 10 and ensuring the operation rate of the hard shell battery 10.

[0094] In some embodiments, the battery 10 includes a limit assembly 500. The outer contour of the limit assembly 500 can be in a variety of structures. In some embodiments, the limit assembly 500 can be a rectangular parallelepiped. In other embodiments, the limit assembly 500 can be a polygon, etc. In other embodiments, the limit assembly 500 can be a cylinder. It depends on the actual situation. The embodiment of the present application takes the rectangular limit assembly 500 as an example. The limit assembly 500 is arranged in the first inner cavity 210, and the limit assembly 500 defines the second inner cavity 510. The limit assembly 500 is provided with a first through hole 520, and the axis of the first through hole 520 is parallel to the third direction Z. The limit assembly 500 is provided with a second through hole 530, and the number of the second through holes 530 can be multiple. For example, the number of the second through holes 530 can be one, two, three, four, five, etc. The axis of the second through hole 530 is parallel to the first direction X, and the first through hole 520 and the second through hole 530 are connected to the second inner cavity 510. In some embodiments, the first through hole 520 is configured to place the battery cell assembly 100. In other embodiments, the second through hole 530 is configured to assist in injecting liquid into the battery cell assembly 100. The battery cell assembly 100 is disposed in the second inner cavity 510, and the limiting assembly 500 is used to abut the battery cell assembly 100 when the battery cell assembly 100 expands, so as to further provide support force to the battery cell assembly 100. In some embodiments, when the tensile strength is M and the silicon content A satisfies: M>4.4492A*100*C / S, A≥50%, the limiting assembly 500 is used to further provide support force to the battery cell assembly 100.

[0095] In some embodiments, along the second direction Y, the tab assembly 300 is disposed on the side of the anode current collecting portion 410 away from the cathode current collecting portion 420, the anode current collecting portion 410 includes a first end 412, the first end 412 abuts against the cathode tab 320, and the current collecting assembly 400 includes an insulating portion 440, the insulating portion 440 is disposed between the first end 412 and the anode current collecting portion 410, and the insulating portion 440 is used to prevent the anode current collecting portion 410 and the first end 412 from being connected, thereby protecting the normal operation of the hard shell battery 10. In other embodiments, along the second direction Y, the tab assembly is disposed on the side of the cathode current collecting portion 420 away from the anode current collecting portion 410, the cathode current collecting portion 420 includes a second end portion 422, and the second end portion 422 abuts against the anode tab 310. The current collecting assembly 400 includes an insulating portion 440, and the insulating portion 440 is disposed between the second end portion 422 and the cathode current collecting portion 420. The insulating portion 440 is used to prevent the cathode current collecting portion 420 and the second end portion 422 from being connected, thereby protecting the normal operation of the hard shell battery 10.

[0096] In some embodiments, along the first direction X, the cathode current collector 420 is at least partially located on one side of the battery cell assembly 100, the battery cell assembly 100 includes a third end 130, and the insulating portion 440 is partially disposed between the cathode current collector 420 and the third end 130, and the insulating portion 440 is used to prevent the cathode current collector 420 and the third end 130 from being connected, thereby protecting the normal operation of the hard shell battery 10. In other embodiments, along the first direction X, the anode current collector 410 is at least partially located on one side of the battery cell assembly 100, the battery cell assembly 100 includes a third end 130, and the insulating portion 440 is partially disposed between the anode current collector 410 and the third end 130, and the insulating portion 440 is used to prevent the anode current collector 420 and the third end 130 from being connected, thereby protecting the normal operation of the hard shell battery 10.

[0097] It should be noted that other contents of the hard shell battery 10, the battery cell assembly 100 and the limiting assembly 500 disclosed in the present application can be referred to the prior art and will not be repeated here.

[0098] In addition, it should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application, but the present application can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not used as additional restrictions on the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Moreover, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the present application; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the present application.

Claims

1. A hard shell battery, characterized in that: include: A battery cell assembly, the battery cell assembly comprising an anode electrode group and a cathode electrode group arranged in a stacked manner; A shell assembly, wherein the shell assembly defines a first inner cavity, the battery cell assembly is disposed in the first inner cavity, and the shell assembly is provided with an air guide channel, the air guide channel communicating with the first inner cavity; Along the first direction, the anode electrode group and the cathode electrode group are stacked and arranged, and along the first direction, the air guide channel is located on one side of the battery cell assembly; The hard shell battery includes a tab assembly, the second direction is set to be a direction perpendicular to the first direction, along the second direction, the tab assembly is arranged on one side of the battery cell assembly, the tab assembly is connected to the battery cell assembly, and along the second direction, the air guide channel is adjacent to one side of the tab assembly; The tab assembly includes an anode tab and a cathode tab, the anode tab is connected to the anode plate group, the cathode tab is connected to the cathode plate group, and along the first direction, the anode tab and the cathode tab are arranged at intervals, the distance from the air guide channel to the anode tab is A, the distance from the air guide channel to the cathode tab is B, and the distance A and the distance B satisfy: A<B.

2. The hard case battery according to claim 1, characterized in that: The housing assembly includes a blocking portion, which is disposed in the air guiding channel to block the air guiding channel, and the blocking portion is configured to be pushed away from the air guiding channel after receiving pressure provided by the battery cell assembly along the first direction.

3. The hard case battery according to claim 1, characterized in that: Along the second direction, the gas guiding channel is adjacent to one side of the anode tab.

4. The hard case battery according to claim 1, characterized in that: The third direction is set to be a direction perpendicular to the first direction and the second direction. Along the third direction, the gas guide channel is adjacent to one side of the anode ear.

5. The hard case battery according to claim 4, characterized in that: The projection plane is a plane perpendicular to the first direction, the gas guide channel forms a first orthographic projection on the projection plane, the anode tab forms a second orthographic projection on the projection plane, and the first orthographic projection coincides with the second orthographic projection.

6. The hard case battery according to claim 5, characterized in that: The first inner cavity forms a third orthographic projection on the projection plane, the anode tab includes a plurality of anode pole sheets, the area of ​​the third orthographic projection is S, the silicon content of the hard shell battery is A, the tensile strength of the shell assembly is M, the number of layers of the anode pole sheets is C, and the area S, the silicon content A, the number of layers of the anode pole sheets C and the tensile strength M satisfy: M≥4A*100*C / S.

7. The hard case battery according to claim 6, characterized in that: The area S, the silicon content A, the number of anode pole plate layers C and the tensile strength M satisfy: M>4.4492A*100*C / S.

8. The hard case battery according to claim 4, characterized in that: The hard shell battery includes a limit assembly, which is arranged in the first inner cavity. The limit assembly defines a second inner cavity. The limit assembly is provided with a first through hole, and the axis of the first through hole is parallel to the third direction. The limit assembly is provided with a second through hole, and the axis of the second through hole is parallel to the first direction. The first through hole and the second through hole are connected to the second inner cavity, and the battery cell assembly is arranged in the second inner cavity.

9. The hard case battery according to claim 4, characterized in that: The hard shell battery includes a current collecting assembly, the current collecting assembly includes an anode current collecting portion and a cathode current collecting portion, the current collecting assembly defines a third inner cavity, the anode current collecting portion has a first wall surface, the cathode current collecting portion has a second wall surface, and along the second direction, the first wall surface and the second wall surface are arranged opposite to each other; Wherein, the anode electrode plate group includes a plurality of anode electrode plates, each of which is arranged one by one along a first direction perpendicular to the second direction, and each of which is connected to the first wall; the cathode electrode plate group includes a plurality of cathode electrode plates, each of which has a different polarity from each of the anode electrode plates, each of which is arranged alternately and stacked with each of the anode electrode plates, and each of which is connected to the second wall; the anode electrode plate includes two first straight pieces, each of which is connected to each other at one end close to the second wall, and each of which is connected to the first wall at one end close to the first wall; the cathode electrode plate includes two second straight pieces, each of which is connected to each other at one end close to the first wall, and each of which is connected to the second wall at one end close to the second wall.

10. The hard case battery according to claim 9, characterized in that: Along the second direction, the tab assembly is arranged on a side of the anode current collecting portion away from the cathode current collecting portion, the anode current collecting portion includes a first end portion, the first end portion abuts against the cathode tab, and the current collecting assembly includes an insulating portion, the insulating portion is arranged between the first end portion and the anode current collecting portion; or, Along the second direction, the tab assembly is arranged on the side of the cathode current collecting portion away from the anode current collecting portion, the cathode current collecting portion includes a second end portion, the second end portion abuts against the anode tab, and the current collecting assembly includes an insulating portion, which is arranged between the second end portion and the cathode current collecting portion.

11. The hard case battery according to claim 10, characterized in that: Along the first direction, the cathode current collecting portion is at least partially located on one side of the battery cell assembly, along the first direction, the battery cell assembly includes a third end portion, and the insulating portion is partially disposed between the cathode current collecting portion and the third end portion; or, Along the first direction, the anode current collecting portion is at least partially located on one side of the battery cell assembly. Along the first direction, the battery cell assembly includes a third end portion, and the insulating portion is partially disposed between the anode current collecting portion and the third end portion.

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