Battery monomer and power utilization device

Abstract

The utility model relates to the technical field of batteries, and discloses a single battery and a power utilization device, the single battery comprises a shell, a substrate and a cushion block, the shell has a height direction, an accommodating cavity is arranged in the shell, and an electrode assembly is arranged in the accommodating cavity; the side wall of one end of the shell in the height direction is a first wall, and an anti-explosion valve is installed on the first wall. The substrate is arranged between the electrode assembly and the first wall, and the substrate is provided with an exhaust channel penetrating through the substrate in the height direction; the at least two cushion blocks are arranged on one side, in the height direction, of the base plate in a protruding mode, so that an exhaust space is formed in one side of the base plate; a positioning hole is formed in the base plate, the cushion block is provided with a protruding part, the protruding part is matched with the positioning hole, and the height H1 of the protruding part is smaller than or equal to the thickness H2 of the base plate. The base plate and the cushion block are designed in a split mode, the pressure of gas in the shell is suddenly increased during thermal failure, the cushion block can move due to pressure change, particularly, the protruding part can be disengaged from the positioning hole to form a standby channel, and the smoothness of an exhaust path is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery monomer and electric device. BACKGROUND

[0002] With the rapid development of new energy vehicles, the safety of batteries is paid more and more attention by users. Among them, the battery shell is provided with an explosion-proof valve, when short circuit occurs in the battery, the explosion-proof valve opens to smoothly spray out high-pressure gas, thereby ensuring the safety of the battery.

[0003] In fact, in order to ensure the insulation protection between the electrode assembly and the shell, an insulating film and a cell support plate need to be arranged between the electrode assembly and the shell, the cell support plate is between the electrode assembly and the bottom wall where the explosion-proof valve is located, and the cell is separated from the explosion-proof valve to prevent the problem of blocking the explosion-proof valve.

[0004] The existing cell support plate is provided with a protrusion on the side facing the cell, and the cell is supported by the protrusion. However, the cell support plate and the protrusion are of an integral structure, and a standby channel cannot be formed when thermal failure occurs, which is difficult to meet the smoothness requirement of battery exhaust. SUMMARY

[0005] The technical problem to be solved by the utility model is that the existing cell support plate and the protrusion are of an integral structure, and a standby channel cannot be formed when thermal failure occurs, which is difficult to meet the smoothness requirement of battery exhaust.

[0006] In order to solve the above technical problem, the utility model provides a technical scheme of a battery monomer:

[0007] The battery monomer comprises:

[0008] A shell, the shell has a height direction, the inside of the shell is provided with a containing cavity, and an electrode assembly is installed in the containing cavity; along the height direction, one end side wall of the shell is a first wall, and an explosion-proof valve is installed on the first wall;

[0009] A base plate is arranged between the electrode assembly and the first wall, and the base plate is provided with an exhaust channel penetrating through the base plate itself along the height direction;

[0010] At least two cushion blocks are arranged, the cushion blocks are protrudingly arranged on one side of the base plate in the height direction to form an exhaust space on one side of the base plate;

[0011] The base plate is provided with a positioning hole, the cushion block is provided with a protruding portion, the protruding portion is matched with the positioning hole, the height of the protruding portion along the height direction is H1, the thickness of the base plate is H2, and H1≤H2.

[0012] Further, the cushion block is provided with a supporting surface on the side close to the convex part, and the supporting surface is attached to the side surface of the substrate in the height direction.

[0013] Further, in the height direction, the normal projection of the explosion-proof valve on the substrate is staggered with the positioning hole.

[0014] Further, the shell is further provided with a length direction and a width direction intersecting with the height direction, and in the height direction, the normal projection of the cushion block on the substrate and the normal projection of the explosion-proof valve on the substrate are arranged along the length direction.

[0015] Further, at least two of the cushion blocks are arranged in a group in the width direction, and the cushion blocks are arranged in at least two groups in the length direction.

[0016] Further, the side of the cushion block away from the substrate is further provided with a gas guide groove, and the gas guide groove is arranged in parallel to the first wall.

[0017] Further, the shell is further provided with a length direction intersecting with the height direction, the cushion block is provided with at least one gas guide groove, the cushion block is provided with two wall surfaces opposite in the length direction, and the gas guide groove penetrates through the two wall surfaces.

[0018] Further, the exhaust passage is a through hole; in the height direction, the through hole is opposite to the explosion-proof valve; or in the height direction, the normal projection of the explosion-proof valve on the substrate is staggered with the through hole.

[0019] Further, the shell is further provided with a length direction intersecting with the height direction, the through hole is provided with at least two, and at least two of the through holes are distributed along the length direction; in the height direction, the normal projection of the explosion-proof valve on the substrate is located between the adjacent two through holes.

[0020] Further, the shell is further provided with a width direction intersecting with the height direction, the exhaust passage is a through groove; along the width direction, the through groove penetrates through one wall surface of the substrate, and in the height direction, the through groove is opposite to the explosion-proof valve; or in the height direction, the normal projection of the explosion-proof valve on the substrate is staggered with the through groove.

[0021] Further, the substrate is provided with a score part, the breakage of the score part in the broken state forms the exhaust passage, the thickness of the score part is less than the thickness of the substrate itself, and in the height direction, the score part is arranged opposite to the explosion-proof valve.

[0022] Further, the shape of the notch part is any one of an I shape, a cross shape, a C shape, a T shape, and a U shape.

[0023] Further, the cushion block is arranged on one side of the substrate close to the first wall, and the exhaust space is formed between the substrate and the first wall.

[0024] Alternatively, the cushion block is arranged on one side of the substrate close to the electrode assembly, and the exhaust space is formed between the substrate and the electrode assembly.

[0025] To solve the above technical problems, the utility model provides a kind of technical scheme of electric device:

[0026] Electric device, comprising battery monomer;Battery monomer includes:

[0027] Shell, the shell has height direction, the inside of the shell is equipped with accommodating cavity, electrode assembly is installed in the accommodating cavity;Along the height direction, one end side wall of the shell is first wall, and explosion-proof valve is installed on the first wall.

[0028] Substrate, the substrate is arranged between the electrode assembly and the first wall, and the substrate is provided with exhaust passage penetrating through the substrate itself along the height direction.

[0029] Cushion block, the cushion block is equipped with at least two, and the cushion block is arranged on one side of the substrate in the height direction to form exhaust space on one side of the substrate.

[0030] The substrate is provided with positioning hole, the cushion block is provided with protruding portion, the protruding portion cooperates with the positioning hole, the height of the protruding portion along the height direction is H1, the thickness of the substrate is H2, and H1≤H2.

[0031] Further, the side of the cushion block close to the protruding portion is provided with supporting surface, and the supporting surface is attached to one side surface of the substrate in the height direction.

[0032] Further, in the height direction, the orthographic projection of the explosion-proof valve on the substrate is staggered with the positioning hole.

[0033] Further, the shell further has length direction and width direction intersecting with the height direction two by two, and in the height direction, the orthographic projection of the cushion block on the substrate and the orthographic projection of the explosion-proof valve on the substrate are arranged along the length direction.

[0034] Further, at least two cushion blocks are arranged in a group in the width direction, and the cushion blocks are arranged in at least two groups in the length direction.

[0035] Further, the cushion block is further provided with a gas guide groove on the side away from the substrate, and the gas guide groove is arranged in parallel to the first wall.

[0036] Further, the shell further has a length direction intersecting with the height direction, the cushion block is provided with at least one gas guide groove, the cushion block is provided with two wall surfaces opposite along the length direction, and the gas guide groove penetrates through the two wall surfaces.

[0037] Further, the exhaust passage is a through hole; in the height direction, the through hole is opposite to the explosion-proof valve; or in the height direction, the orthographic projection of the explosion-proof valve on the substrate is staggered with the through hole.

[0038] Further, the shell further has a length direction intersecting with the height direction, the through hole is provided with at least two, and the at least two through holes are distributed at intervals along the length direction; in the height direction, the orthographic projection of the explosion-proof valve on the substrate is located between the adjacent two through holes.

[0039] Further, the shell further has a width direction intersecting with the height direction, the exhaust passage is a through groove; along the width direction, the through groove penetrates through one wall surface of the substrate, and in the height direction, the through groove is opposite to the explosion-proof valve; or in the height direction, the orthographic projection of the explosion-proof valve on the substrate is staggered with the through groove.

[0040] Further, the substrate is provided with a score part, the breakage of the score part in the broken state forms the exhaust passage, the thickness of the score part is less than the thickness of the substrate itself, and in the height direction, the score part is arranged opposite to the explosion-proof valve.

[0041] Further, the score part has any one of an I shape, a cross shape, a C shape, a T shape, and a U shape.

[0042] Further, the cushion block is protrudingly arranged on the side of the substrate close to the first wall, and the exhaust space is formed between the substrate and the first wall.

[0043] Alternatively, the cushion block is protrudingly arranged on the side of the substrate close to the electrode assembly, and the exhaust space is formed between the substrate and the electrode assembly.

[0044] The battery monomer of the utility model discloses a battery monomer and electric device compared with prior art, its beneficial effect lies in: the battery monomer adopts the design form of casing, electrode assembly, substrate and cushion block, electrode assembly is installed in casing, and the one end lateral wall of casing in height direction is first wall, and first wall is installed with explosion -proof valve, and explosion -proof valve is used to open when electrode assembly short -circuit thermal failure occurs, to supply high -temperature high -pressure gas to export through explosion -proof valve.

[0045] And, the cushion block is provided with at least two, and the cushion block is protrudingly arranged on one side of the substrate in the height direction to form an exhaust space on one side of the substrate, and the existence of the cushion block plays a role in separating and supporting the substrate and the first wall or the electrode assembly, thereby effectively separating the exhaust space and accommodating and buffering the high-temperature and high-pressure gas during thermal failure. The substrate is provided with a positioning hole, the cushion block is provided with a protruding portion, the protruding portion cooperates with the positioning hole, the height of the protruding portion in the height direction is H1, the thickness of the substrate is H2, and H1≤H2, so that the protruding portion is prevented from protruding to the other side of the substrate, and the stability of the support of the electrode assembly is ensured.

[0046] The key is that the substrate and the cushion block are designed in a split type, and the gas pressure in the casing increases suddenly when the battery fails, and the pressure change causes the cushion block to move relative to the substrate, and in particular, the protruding portion can be detached from the positioning hole and form a standby channel, thereby ensuring the smoothness of the exhaust path of the battery during thermal failure. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 is a sectional view of the battery monomer in the utility model embodiment;

[0048] Figure 2 is Figure 1 is a local enlarged view of A in the middle;

[0049] Figure 3 is a bottom view of the battery monomer of the battery monomer in the utility model embodiment;

[0050] Figure 4 is a three-dimensional schematic view of the substrate and the cushion block in the assembled state in the utility model embodiment;

[0051] Figure 5 is a front view schematic view of the substrate and the cushion block in the assembled state in the utility model embodiment;

[0052] Figure 6 is a bottom view schematic view of the substrate and the cushion block in the assembled state in the utility model embodiment;

[0053] Figure 7 is a perspective view of the cushion block (first perspective view) in the embodiment of the utility model;

[0054] Figure 8 is a perspective view of the cushion block (second perspective view) in the embodiment of the utility model;

[0055] Figure 9 is a perspective view of the base plate in the first other embodiment of the battery monomer of the utility model;

[0056] Figure 10 is a perspective view of the base plate in the second other embodiment of the battery monomer of the utility model;

[0057] Figure 11 is a perspective view of the base plate in the third other embodiment of the battery monomer of the utility model;

[0058] In the drawing: 1 - shell, 10 - containing cavity, 11 - first wall, 12 - explosion-proof valve, 2 - electrode assembly, 3 - base plate, 30 - exhaust passage, 301 - through hole, 303 - through slot, 304 - score part, 31 - exhaust space, 32 - positioning hole, 4 - cushion block, 40 - protruding part, 41 - air guide groove, 42 - supporting surface, 43 - wall surface, Z - height direction, X - length direction, Y - width direction. DETAILED DESCRIPTION

[0059] The specific embodiments of the utility model are described in further detail below in combination with the drawings and embodiments. The following embodiments are used to illustrate the utility model, but are not used to limit the scope of the utility model.

[0060] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like in the utility model are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and are not indicative or suggestive of the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0062] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0063] like Figures 1 to 8 As shown, a battery cell according to an embodiment of the present invention includes: a housing 1, a substrate 3, and a pad 4. The housing 1 has a height direction Z, and the interior of the housing 1 is provided with a receiving cavity 10, in which an electrode assembly 2 is installed. Along the height direction Z, one end sidewall of the housing 1 is a first wall 11, and an explosion-proof valve 12 is installed on the first wall 11. The substrate 3 is disposed between the electrode assembly 2 and the first wall 11, and the substrate 3 is provided with an exhaust channel 30 that penetrates the substrate 3 itself along the height direction Z.

[0064] At least two pads 4 are provided. The pads 4 protrude from one side of the substrate 3 in the height direction Z to form an exhaust space 31 on one side of the substrate 3. The substrate 3 has a positioning hole 32. The pads 4 have a protrusion 40. The protrusion 40 cooperates with the positioning hole 32. The height of the protrusion 40 in the height direction Z is H1. The thickness of the substrate 3 is H2. H1≤H2.

[0065] The battery cell adopts a design consisting of a housing 1, an electrode assembly 2, a substrate 3, and a pad 4. The electrode assembly 2 is installed in the housing 1. The side wall of the housing 1 at one end in the height direction Z is a first wall 11. An explosion-proof valve 12 is installed on the first wall 11. The explosion-proof valve 12 is used to open when the electrode assembly 2 experiences a short-circuit thermal failure, allowing high-temperature and high-pressure gas to be discharged outward through the explosion-proof valve 12. The substrate 3 is disposed between the electrode assembly 2 and the first wall 11, that is, the substrate 3 is used to isolate and support the electrode assembly 2 and the first wall 11. The substrate 3 is provided with an exhaust channel 30 that runs through the substrate 3 itself in the height direction Z. The exhaust channel 30 can connect the two sides of the substrate 3, so that the high-temperature and high-pressure gas generated when the electrode assembly 2 experiences thermal failure can be discharged out of the housing 1 through the exhaust channel 30 and the explosion-proof valve 12.

[0066] Moreover, the cushion block 4 is provided with at least two, and the cushion block 4 protrudes on one side of the base plate 3 in the height direction Z to form an exhaust space 31 on one side of the base plate 3. It is the existence of the cushion block 4 that plays a role in separating and supporting the base plate 3 from the first wall 11 or the electrode assembly 2, thereby effectively separating the exhaust space 31 formed to accommodate and buffer the high-temperature and high-pressure gas during thermal failure. The base plate 3 is provided with a positioning hole 32, and the cushion block 4 is provided with a protruding portion 40 that cooperates with the positioning hole 32. The height of the protruding portion 40 in the height direction Z is H1, and the thickness of the base plate 3 is H2, H1≤H2, so as to avoid the protruding portion 40 protruding towards the other side of the base plate 3, and to ensure the stability of the support of the electrode assembly 2.

[0067] The key is that the base plate 3 and the cushion block 4 adopt a split design. When the gas pressure in the shell increases suddenly during thermal failure of the battery, the pressure change will cause the cushion block 4 to move relative to the base plate 3, and in particular, the protruding portion 40 can be detached from the positioning hole 32 and form a standby passage, thereby ensuring the smoothness of the exhaust path of the battery during thermal failure.

[0068] In the embodiment, the side of the cushion block 4 close to the protruding portion 40 is provided with a supporting surface 42 that is attached to the surface on one side of the base plate 3 in the height direction Z. By attaching the supporting surface 42 of the cushion block 4 to the surface on one side of the base plate 3, the supporting surface 42 has a large supporting contact surface, thereby ensuring the stability of the base plate 3. The material of the cushion block 4 is ceramic, PP, or other polymer, and accordingly, the material of the base plate 3 is PP and composite polymer. Specifically, the protruding portion 10 is a circular boss, and the positioning hole 32 is a circular hole. Through the concave-convex cooperation of the circular boss and the circular hole, the cushion block 4 can be accurately positioned, and the assembly position of the cushion block 4 relative to the base plate 3 is stable and reliable.

[0069] In the height direction Z, the normal projection of the explosion-proof valve 12 on the base plate 3 is staggered with the positioning hole 32. By adopting a staggered arrangement, the installation position of the cushion block 4 can be prevented from overlapping and interfering with the explosion-proof valve 12. Specifically, the shell 1 also has a length direction X and a width direction Y that intersect with the height direction Z. In the height direction Z, the normal projection of the cushion block 4 on the base plate 3 and the normal projection of the explosion-proof valve 12 on the base plate 3 are arranged along the length direction X, which can prevent the cushion block 4 from blocking the explosion-proof valve 12, thereby ensuring the smoothness of the exhaust path.

[0070] The battery monomer is a square cell, the substrate 3 is a rectangular substrate, and the substrate 3 is matched with the four peripheral side walls of the shell 1, so that the four gaps between the substrate 3 and the four peripheral side walls of the shell 1 form an exhaust path. Moreover, at least two pads 4 are arranged in a group in the width direction Y, and the pads 4 are arranged in at least two groups in the length direction X. The at least two pads 4 arranged in the width direction Y form a group, which improves the stability of the support of the pads 4 on the substrate 3 or the electrode assembly 2, and the at least two groups of pads 4 are arranged in the length direction X, which ensures the overall connectivity of the exhaust space 31 in the length direction X.

[0071] In this embodiment, the pads 4 are also provided with gas guide grooves 41 on the side away from the substrate 3, and the gas guide grooves 41 are arranged in parallel to the first wall 11. On the basis of the exhaust space 31, the gas guide grooves 20 of the pads 4 further increase the path of gas flow. It should be noted that the included angle between the length extension direction of the gas guide grooves 20 and the first wall 11 is within the range of 0° to 10°, which falls within the protection scope defined by "parallel" in this embodiment.

[0072] As a further preferred scheme, the pads 4 are provided with at least one gas guide groove 41, and the pads 4 are provided with two opposite wall surfaces 43 in the length direction X, and the gas guide groove 41 penetrates the two wall surfaces 43. Specifically, the pads 4 are provided with two gas guide grooves 41, and the two gas guide grooves 41 extend in parallel to the length direction X, which ensures the smoothness of the exhaust space 31 in the length direction X and reduces the blocking effect of the pads 4 on the exhaust.

[0073] In this embodiment, the exhaust passage 30 is a through hole 301; in the height direction Z, the orthographic projection of the explosion-proof valve 12 on the substrate 3 is offset from the through hole 301. As a further preferred scheme, the through hole 301 is provided with at least two, and the at least two through holes 301 are distributed in the length direction X; in the height direction Z, the orthographic projection of the explosion-proof valve 12 on the substrate 3 is located between the adjacent two through holes 301.

[0074] When the electrode assembly 2 occurs short-circuit thermal failure, the high-temperature and high-pressure gas first enters the other side of the substrate 3 through the exhaust hole 41, and then the gas flows along the length direction X to reach the explosion-proof valve 12. Since the gas is gathered on the other side of the substrate 3 and causes the substrate 3 to deform towards the side close to the electrode assembly 2, the cross-sectional area of the gas flowing in the length direction X is increased, thereby ensuring the smoothness of the exhaust.

[0075] In addition, the cushion block 4 is protruded on the side of the base plate 3 close to the first wall 11, and the exhaust space 31 is formed between the base plate 3 and the first wall 11. The exhaust path is formed in sequence from the side of the base plate 3 close to the electrode assembly 2, the exhaust passage 30, the exhaust space 31 to the explosion-proof valve 12, and the cushion block 4 is not protruded on the side of the base plate 3 facing the electrode assembly 2, which ensures the reliable support stress of the electrode assembly 2. In other embodiments, the cushion block can also be protruded on the side of the base plate close to the electrode assembly, and the corresponding exhaust space is formed between the base plate and the electrode assembly.

[0076] As shown in Figure 9 the other embodiment of the battery monomer of the utility model, the difference from the above-mentioned embodiment of the battery monomer of the utility model lies in that, in the height direction Z, the through hole 301 is opposite to the explosion-proof valve 12. Specifically, the through hole 301 is arranged at the middle position of the base plate 3 in the length direction, and the positioning hole 32 is distributed at the both end positions of the through hole 301, which shortens the length and the turning place of the exhaust path, and improves the exhaust efficiency when the battery is in thermal runaway.

[0077] As shown in Figure 10 the other embodiment of the battery monomer of the utility model, the difference from the above-mentioned embodiment of the battery monomer of the utility model lies in that, in the height direction Z, the through hole 301 is opposite to the explosion-proof valve 12. Specifically, the through hole 301 is arranged at the middle position of the base plate 3 in the length direction, and the positioning hole 32 is distributed at the both end positions of the through hole 301, which shortens the length and the turning place of the exhaust path, and improves the exhaust efficiency when the battery is in thermal runaway.

[0078] As shown in Figure 11 the other embodiment of the battery monomer of the utility model, the difference from the above-mentioned embodiment of the battery monomer of the utility model lies in that, in the height direction Z, the through hole 301 is opposite to the explosion-proof valve 12. Specifically, the through hole 301 is arranged at the middle position of the base plate 3 in the length direction, and the positioning hole 32 is distributed at the both end positions of the through hole 301, which shortens the length and the turning place of the exhaust path, and improves the exhaust efficiency when the battery is in thermal runaway.

[0079] In the embodiment, the combination structure of the base plate 3, the exhaust hole 32 and the cushion block 4 is adopted, the opening pressure of the battery monomer is 0.6±0.2MPa, the weld pressure strength of the shell 1 is 1.2MPa, the internal pressure value is 1.1MPa when thermal runaway occurs, the shell 1 does not burst, and the explosion-proof valve 12 normally opens and exhausts.

[0080] Comparative Example 1: The substrate is retained and the pad is removed, the valve opening pressure of the battery cell is 0.6±0.2 MPa, the weld pressure strength of the battery shell is 1.2 MPa, and the internal pressure value is 1.5 MPa when thermal runaway occurs; the battery shell does not explode, and the explosion-proof valve opens to exhaust; but the internal pressure is too large, and the battery shell has a high risk of explosion.

[0081] Comparative Example 2: The substrate and the pad are retained and the gas guide groove is removed, the valve opening pressure of the battery cell is 0.6±0.2 MPa, the weld pressure strength of the battery shell is 1.2 MPa, and the internal pressure value is 1.2 MPa when thermal runaway occurs; 5% of the battery shell explodes, the explosion-proof valve opens to exhaust; but the internal pressure is large, and the battery shell has a high risk of explosion.

[0082] Comparative Example 3: The pad is retained and the exhaust hole of the substrate is removed, the valve opening pressure of the battery cell is 0.6±0.2 MPa, the weld pressure strength of the battery shell is 1.2 MPa, and the internal pressure value is 1.3 MPa when thermal runaway occurs; 10% of the battery shell explodes, the explosion-proof valve opens to exhaust; but the internal pressure is large, and the battery shell has a high risk of explosion.

[0083] In summary, compared with Comparative Examples 1, 2 and 3, the battery monomer of the present embodiment adopts the design form of the shell 1, the electrode assembly 2, the substrate 3, the exhaust hole 41 and the pad 4, the exhaust passage is smooth, and the safety of the battery cell when thermal failure occurs is high.

[0084] A kind of electric device of the utility model embodiment, including battery monomer, the battery monomer is identical with each specific embodiment of battery monomer in the above-mentioned utility model specific embodiment, here no longer repeat.

[0085] The above is only the preferred embodiment of the utility model, it should be pointed out that, for ordinary skilled person in the art, without departing from the technical principle of the utility model, a number of improvements and substitutions can be made, these improvements and substitutions should also be regarded as the protection scope of the utility model.

Claims

1. A battery cell, characterized in that, include: A housing (1) has a height direction (Z), and the housing (1) has an internal cavity (10) in which an electrode assembly (2) is installed. Along the height direction (Z), one end of the housing (1) is a first wall (11), and an explosion-proof valve (12) is installed on the first wall (11). A substrate (3) is disposed between the electrode assembly (2) and the first wall (11), and the substrate (3) is provided with an exhaust channel (30) that extends through the substrate (3) itself along the height direction (Z); At least two pads (4) are provided, and the pads (4) are protruding from the substrate (3) on one side of the height direction (Z) to form an exhaust space (31) on one side of the substrate (3). The substrate (3) has a positioning hole (32), and the pad (4) has a protrusion (40). The protrusion (40) cooperates with the positioning hole (32). The height of the protrusion (40) along the height direction (Z) is H1, and the thickness of the substrate (3) is H2, where H1≤H2.

2. The battery cell according to claim 1, characterized in that, The pad (4) has a support surface (42) on the side near the protrusion (40), and the support surface (42) is in contact with the surface of the substrate (3) on one side in the height direction (Z).

3. The battery cell according to claim 1, characterized in that, In the height direction (Z), the orthographic projection of the explosion-proof valve (12) on the substrate (3) is offset from the positioning hole (32).

4. The battery cell according to claim 3, characterized in that, The housing (1) also has a length direction (X) and a width direction (Y) that intersect the height direction (Z) in pairs. In the height direction (Z), the orthographic projection of the pad (4) on the base plate (3) and the orthographic projection of the explosion-proof valve (12) on the base plate (3) are arranged at intervals along the length direction (X).

5. The battery cell according to claim 4, characterized in that, At least two of the pads (4) are spaced apart in a group in the width direction (Y), and at least two groups of the pads (4) are spaced apart in the length direction (X).

6. The battery cell according to claim 1, characterized in that, The pad (4) is provided with an air guide groove (41) on the side away from the substrate (3), and the air guide groove (41) extends parallel to the first wall (11).

7. The battery cell according to claim 6, characterized in that, The housing (1) also has a length direction (X) intersecting the height direction (Z), and the pad (4) is provided with at least one of the air guide grooves (41). The pad (4) is provided with two walls (43) opposite to each other along the length direction (X), and the air guide groove (41) penetrates the two walls (43).

8. The battery cell according to claim 1, characterized in that, The exhaust channel (30) is a through hole (301); in the height direction (Z), the through hole (301) is opposite to the explosion-proof valve (12); or, in the height direction (Z), the orthographic projection of the explosion-proof valve (12) on the substrate (3) is offset from the through hole (301).

9. The battery cell according to claim 8, characterized in that, The housing (1) also has a length direction (X) intersecting the height direction (Z), and at least two through holes (301) are provided, with at least two through holes (301) spaced apart along the length direction (X); in the height direction (Z), the orthographic projection of the explosion-proof valve (12) on the substrate (3) is located between two adjacent through holes (301).

10. The battery cell according to claim 1, characterized in that, The housing (1) also has a width direction (Y) intersecting the height direction (Z), and the exhaust channel (30) is a through groove (303); along the width direction (Y), the through groove (303) penetrates one wall of the substrate (3), and in the height direction (Z), the through groove (303) is opposite to the explosion-proof valve (12); or, in the height direction (Z), the orthographic projection of the explosion-proof valve (12) on the substrate (3) is offset from the through groove (303).

11. The battery cell according to claim 1, characterized in that, The substrate (3) is provided with a scribing portion (304). When the scribing portion (304) is in the broken state, the opening forms the exhaust channel (30). The thickness of the scribing portion (304) is less than the thickness of the substrate (3) itself. In the height direction (Z), the scribing portion (304) is arranged opposite to the explosion-proof valve (12).

12. The battery cell according to claim 11, characterized in that, The shape of the grooved portion (304) is any one of the following: I-shaped, cross-shaped, C-shaped, T-shaped, and U-shaped.

13. The battery cell according to claim 1, characterized in that, The pad (4) protrudes from the side of the substrate (3) near the first wall (11), and the exhaust space (31) is formed between the substrate (3) and the first wall (11); Alternatively, the pad (4) protrudes from the side of the substrate (3) near the electrode assembly (2), and the exhaust space (31) is formed between the substrate (3) and the electrode assembly (2).

14. An electrical appliance, characterized in that, Includes the battery cell as described in any one of claims 1 to 13.

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