Battery cell, battery device, power consumption device and energy storage device

Abstract

A battery cell provided with a top cover (1), the top cover (1) comprising: a cover body (11) which is provided with a first through-opening (111); a connection (12) comprising a body (121) and a projection (122), wherein the body (121) passes through the first through-hole (111); a mounting plate (13) which is connected to an end of the body (121) which is facing away from the projection (122), and a sealing element (16) provided between the cover body (11) and the projection (122), wherein a first support element (14) and a second support element (15) are provided between the cover body (11) and the mounting plate (13), wherein the first support element (14) is provided with a mounting opening (142), the mounting opening (142), the mounting plate (13) and the cover body (11) together form a mounting cavity and the second support element (15) is installed in the mounting cavity; along a first direction (X) a dimension of the mounting cavity is larger than a dimension of the second support element (15), and the first direction (X) is a thickness direction of the cover body (11); and along the first direction (X) a projection of the first support element (14) onto the cover body (11) extends beyond a projection of the mounting plate (13) onto the cover body (11).

Description

TECHNICAL AREA

[0001] The present disclosure relates to the technical field of batteries, in particular a battery cell, a battery device, a power consumption device and an energy storage device. TECHNICAL BACKGROUND

[0002] A battery comprises a casing, a cell assembly, and a top cover. The cell assembly is mounted in a receiving recess in the casing, and the top cover seals an opening in the receiving recess. The top cover includes a cover body and a terminal. The terminal is connected to a positive and a negative electrode of the cell assembly. The cell assembly can generate flammable gas during operation. To prevent the battery from exploding, it is essential to prevent oxygen-containing gas from entering the casing from the outside. Existing batteries exhibit poor airtightness in the event of short circuits or temperature increases, which poses safety risks. SUMMARY

[0003] Embodiments of the present disclosure provide a battery cell, a battery device, a power consumption device and an energy storage device.

[0004] Some embodiments of the present disclosure provide a battery cell that is provided with a top cover, wherein the top cover comprises a cover body, a terminal, a mounting plate, and a sealing element. The cover body is provided with a first through-opening, the terminal comprises a body and a projection, the body of which passes through the first through-opening, the mounting plate is connected to an end of the body that is away from the projection, and the sealing element is provided between the cover body and the projection.A first support element and a second support element are provided between the cover body and the mounting plate, the first support element being provided with a mounting opening. The mounting opening, the mounting plate, and the cover body together form a mounting cavity, and the second support element is mounted in the mounting cavity. Along a first direction, a dimension of the mounting cavity is larger than that of the second support element, the first direction being a thickness direction of the cover body, and along the first direction, a projection of the first support element onto the cover body extends beyond a projection of the mounting plate onto the cover body.

[0005] In some embodiments, the upper cover has a first state and a second state; in the first state, the first support element rests against the cover body and the mounting plate, and the sealing element has a first compressed dimension D1 along the first direction; and in the second state, the second support element rests against the cover body and the mounting plate, and the sealing element has a second compressed dimension D2 along the first direction, wherein the second compressed dimension D2 is larger than the first compressed dimension D1.

[0006] In some embodiments, an uncompressed dimension of the sealing element along the first direction is a fourth dimension D, wherein a ratio of the first compressed dimension D1 to the fourth dimension D 55% ≤ D1 / D ≤ 75% is satisfied, and a ratio of the second compressed dimension D2 to the fourth dimension D 75% ≤ D2 / D ≤ 95% is satisfied.

[0007] In some embodiments, one side of the cover body facing the mounting plate is provided with a first mounting groove, and one side of the mounting plate facing the cover body is provided with a second mounting groove; and along the first direction, the mounting opening penetrates the first support element, so that the second support element extends into the first mounting groove and the second mounting groove.

[0008] In some embodiments, the first support element has a third dimension C, wherein the third dimension C has a third tolerance t C exhibits, wherein the third tolerance tc is calculated by a quadratic mean value method; and / or the second support element has a fifth dimension F, wherein the fifth dimension F has a fifth tolerance t F exhibits, with the fifth tolerance t Fcalculated using the quadratic mean value method.

[0009] In some embodiments, the cover body has a first dimension A along the first direction, wherein the first dimension A has a first tolerance t A exhibits, and the body has a second dimension B1, wherein the second dimension B1 has a second tolerance t B1 exhibits; when the top cover is in the first state, the first compressed dimension D1 has a first compressed tolerance t D1 ; and the first compressed dimension D1 satisfies D1=B1-CA, and the first compressed tolerance t D1 fulfilled t D1 2 = t B1 2 +t C 2 +t A 2 .

[0010] In some embodiments: If the first compressed dimension D1 satisfies 0.71 ± 0.0775 mm, the third dimension C satisfies 2.29 ± 0.0317 mm; or if the first compressed dimension D1 satisfies 0.775 ± 0.0875 mm, the third dimension C satisfies 2.225 ± 0.0515 mm; or if the first compressed dimension D1 satisfies 0.84 ± 0.0975 mm, the third dimension C satisfies 2.16 ± 0.0671 mm; or if the first compressed dimension D1 satisfies 0.905 ± 0.1075 mm, the third dimension C satisfies 2.095 ± 0.0810 mm.

[0011] In some embodiments, the cover body has a first dimension A along the first direction, wherein the first dimension A has a first tolerance t A exhibits a second dimension B1, wherein the second dimension B1 has a second tolerance t B1 exhibits the first mounting groove having a sixth dimension A1, wherein the sixth dimension A1 has a sixth tolerance t A1, and the second mounting groove has a seventh dimension E1, wherein the seventh dimension E1 has a seventh tolerance t E1 exhibits; when the upper cover is in the second state, the second compressed dimension D2 exhibits a second compressed tolerance t D2 and the second compressed dimension D2 satisfies D2=B1+E1+A1-FA, and the second compressed tolerance t D2 fulfilled t D2 2 = t B1 2 +t E1 2 +tA1 2 +t F 2 +t A 2 .

[0012] In some embodiments: If the second compressed dimension D2 satisfies 0.8901 ± 0.1026 mm, the fifth dimension F satisfies 3.1099 ± 0.0230 mm; or if the second compressed dimension D2 satisfies 0.9775 ± 0.1150 mm, the fifth dimension F satisfies 3.0225 ± 0.0568 mm; or if the second compressed dimension D2 satisfies 1.0625 ± 0.1250 mm, the fifth dimension F satisfies 2.9375 ± 0.0750 mm; or if the second compressed dimension D2 satisfies 1.1475 ± 0.1350 mm, the fifth dimension F satisfies 2.8525 ± 0.0907 mm.

[0013] In some embodiments, one side of the cover body facing the mounting plate is provided with a first mounting groove, or one side of the mounting plate facing the cover body is provided with a second mounting groove; and along the first direction, the mounting opening penetrates the first support element, so that the second support element extends into the first mounting groove or the second mounting groove.

[0014] In some embodiments, one dimension of the second support element is larger than that of the first support element along the first direction.

[0015] In some embodiments, several second support elements are provided along a circumferential direction of the connection; or the second support element is ring-shaped.

[0016] In some embodiments, the second support element is made of ceramic.

[0017] Some embodiments of the present disclosure provide a method for assembling a battery cell, wherein the battery cell is provided with a top cover, the top cover comprising a cover body, a connector, a mounting plate and a sealing element, and a first support element and a second support element are provided between the cover body and the mounting plate; and the method for assembling the battery cell comprises the assembly of the top cover, and the assembly of the top cover comprises: placing the second support element in a mounting opening of the first support element; placing the second support element on the cover body; placing the sealing element on the connector; passing the connector through a first through-opening in the cover body; and connecting the connector to the mounting plate.

[0018] Some embodiments of the present disclosure provide a battery device, wherein the battery device comprises the battery cell described above and the battery device comprises one or more of the following elements: a battery module, a battery pack and an energy storage battery.

[0019] In some embodiments, the mounting plate is connected to at least one battery cell.

[0020] Some embodiments of the present disclosure provide a teaching for assembling a battery device, wherein the battery device comprises a plurality of battery cells and a mounting plate, the battery cells each being provided with a top cover, the top cover comprising a cover body, a terminal element, a sealing element and a first support element, and wherein a second support element is provided between the cover body and the mounting plate; and the teaching for assembling a battery device comprises: attaching the second support element into an attachment opening of the first support element; attaching the second support element to the cover body; attaching the sealing element to the terminal; passing the terminal through a first through-opening in the cover body; and connecting the mounting plate to at least one of the terminals.

[0021] Some embodiments of the present disclosure provide a power consumption device comprising the battery device described above, wherein the battery device is configured to supply electrical energy.

[0022] Some embodiments of the present disclosure provide an energy storage device comprising the battery device described above, wherein the battery device is configured to supply electrical energy.

[0023] In the present disclosure, the sealing element seals a gap between the cover body and the terminal, thereby maintaining airtightness inside the battery cell and preventing a fire or explosion that could be caused by contact between a flammable gas inside the battery cell and oxygen. The first support element seals a gap between the cover body and the mounting plate, further preventing the ingress of gas from the outside into the housing and contact with the cell assembly. It also prevents contact of dust or dirt from the outside with the sealing element, keeps the sealing element in a relatively ideal and controllable condition, and provides a relatively ideal and controllable condition for the terminal, resulting in a stable insulation resistance of the terminal.

[0024] Along the first direction, the dimension of the mounting cavity is larger than that of the second support element, thus preventing breakage of the second support element, the cover body or the mounting plate caused by mutual pressure between the second support element, the cover body and the mounting plate, which are relatively hard.

[0025] Along the first direction, the first support element projects further beyond the cover body than the mounting plate, resulting in a larger contact area between the mounting plate and the first support element. This allows the first support element to exert a stronger supporting effect on the mounting plate. The mounting plate is harder than the first support element, so the thickness of the portion of the first support element extruded by the mounting plate along the first direction is less than the thickness of the portion not extruded by the mounting plate. This makes it difficult for dust or dirt from the outside to penetrate between the mounting plate and the cover body.

[0026] It is understood that the above general description and the detailed description below are merely exemplary and illustrative and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a schematic structural representation of a battery cell according to some embodiments of the present disclosure; Fig. 2 is a schematic structural representation of an upper cover in Fig. 1 in a first state; Fig. Figure 3 is a schematic structural representation of a cover body in Fig. 2; Fig. Figure 4 is a schematic structural representation of a connection in Fig. 2; Fig. Figure 5 is a schematic structural representation of a first support element in Fig. 2; Fig. 6 is a schematic structural representation of an upper cover in Fig. 1 in a second state; Fig. Figure 7 is a schematic structural representation of a mounting plate in Fig. 2; Fig. Figure 8 is a flowchart of a method for assembling a battery cell according to some embodiments of the present disclosure; Fig. Figure 9 is a schematic representation of a partial structure of a battery device according to some embodiments of the present disclosure; and Fig. Figure 10 is a flowchart of a method for assembling a battery device according to some embodiments of the present disclosure.

[0027] Reference symbols: 10: Battery cell; 1: Top cover; 11: Cover body; 111: First through-hole; 112: First mounting groove; 12: Connector; 121: Body; 122: Projection; 13: Mounting plate; 131: Second mounting groove; 14: First support element; 141: Second through-hole; 142: Mounting opening; 15: Second support element; 16: Sealing element; 2: Housing.

[0028] The accompanying drawings, which form part of this description, illustrate embodiments according to the present disclosure and, together with the description, serve to explain the principles of the present disclosure. DESCRIPTION OF EXECUTION FORMS

[0029] To better understand the technical solutions of the present disclosure, embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0030] It should be clear that the described embodiments represent only a part and not all embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments that are obtained by persons skilled in the art without creative effort fall within the scope of protection of the present disclosure.

[0031] The terms used in the embodiments of this disclosure serve only to describe specific embodiments and are not intended to limit the present disclosure. As used in the embodiments of this disclosure and the appended claims, the singular forms of "a / an", "mentioned / mentioned", and "the / a / an" are intended to include plural forms unless other meanings are clearly evident from the context.

[0032] It is understood that the term "and / or" here simply describes an associative relationship, denoting associated objects, and that three relationships are possible. For example, A and / or B can mean that there are three cases: A alone, A and B together, and B alone. Furthermore, the symbol " / " here generally indicates that the associated objects are in an "or" relationship.

[0033] It should be noted that the directional terms described in the embodiments of this disclosure, such as "above", "below", "left", and "right", are described from the perspective of the accompanying drawings and should not be interpreted as limiting the embodiments of this disclosure. Furthermore, it should also be understood in the context that when an element is described as being "on / above" or "below / below" another element, it may not only be directly "on / above" or "below / below" the other element, but may also be indirectly "on / above" or "below / below" the other element via an intermediate element.

[0034] Some embodiments of the present disclosure provide a battery cell 10. As in Fig. As shown in Figure 1, the battery cell 10 comprises: a housing 2, a cell assembly, and a top cover 1. The housing 2 has a receiving recess. One end of the receiving recess is provided with an opening. The cell assembly can be inserted into the receiving recess through the opening. The top cover 1 can seal the opening of the receiving recess, thus enclosing the cell assembly in a closed environment. The cell assembly can be in laminated or wound form.

[0035] As in Fig. 2 to Fig. As shown in Figure 4, the upper cover 1 comprises a cover body 11 and a terminal 12. The cover body 11 is provided with a first through-opening 111. The terminal 12 comprises a body 121 and a projection 122. The body 121 extends through the first through-opening 111. The cell assembly has a positive electrode and a negative electrode. The terminal 12 of the upper cover 1 comprises a positive terminal and a negative terminal. The positive terminal is connected to the positive electrode of the cell assembly, and the negative terminal is connected to the negative electrode of the cell assembly.

[0036] To simplify the description, a thickness direction of the cover body 11 is defined as the first direction X.

[0037] As in Fig. As shown in Figure 2, the upper cover 1 further comprises a mounting plate 13. The mounting plate 13 is connected to an end of the body 121 that is away from the projection 122. Along the first direction X, a projection of the mounting plate 13 extends onto the cover body 11 beyond a projection of the first through-opening 111 onto the cover body 11, so that the mounting plate 13 can prevent the connector 12 from falling from the cover body 11 into the housing 2.

[0038] In some embodiments, the mounting plate 13 is part of the connector 12. That is, the connector 12 comprises the body 121, the projection 122, and the mounting plate 13. The body 121 and the projection 122 can be integral, with the mounting plate 13 provided separately. The body 121 and the mounting plate 13 can be integral, with the projection 122 provided separately. The body 121, the projection 122, and the mounting plate 13 can all be provided separately. The material of the mounting plate 13 can be the same as that of the connector 12, or the mounting plate 13 can be made of aluminum sheet. If the mounting plate 13 is provided separately, it can be joined to the body 121 by welding. To ensure the strength of the connection between them, the weld width is, for example, more than 1.5 cm.The weld width can be, for example, 1.51 cm, 1.52 cm, 1.53 cm, 1.54 cm, 1.55 cm, 1.58 cm, 1.6 cm, 1.7 cm, 1.8 cm, 2.0 cm or the like, thus preventing insufficient strength of the connection between the mounting plate 13 and the body 121 due to an insufficient weld width.

[0039] The upper cover 1 further comprises a sealing element 16. The sealing element 16 is provided between the cover body 11 and the projection 122, thereby sealing a gap between the cover body 11 and the connection 12, maintaining airtightness inside the battery cell 10, and preventing a fire or explosion that could be caused by contact between a flammable gas inside the battery cell 10 and oxygen. The sealing element 16 has an annular cross-section and is slid over the body 121.

[0040] The upper cover 1 has a first state and a second state. The first state is a state in which the battery cell 10 is at room temperature, or a state in which the battery cell 10 is at a normal operating temperature. The second state is a state in which the temperature of the battery cell 10 rises above the normal operating temperature due to a reason such as a short circuit.

[0041] As in Fig. 2 and Fig. As shown in Figure 5, a first support element 14 and a second support element 15 are provided between the cover body 11 and the mounting plate 13. When the upper cover 1 is in the first state, the first support element 14 can retain its shape. The first support element 14 is provided with a mounting opening 142. The mounting opening 142, the mounting plate 13, and the cover body 11 together form a mounting cavity, and the second support element 15 is installed in the mounting cavity. The first support element 14 is a plastic ring. The plastic ring is provided with a second through-opening 141, and the body 121 is passed through the second through-opening 141 so that the plastic ring is slid over an outer circumference of the body 121.

[0042] For example, along the first direction X, one dimension of the mounting cavity is larger than that of the second support element 15. That is, in the first state, the first support element 14 rests against the cover body 11 and the mounting plate 13, and the first support element 14 serves to support the mounting plate 13 and the connection 12.

[0043] In a first aspect, the first support element 14 is in close contact with the cover body 11 and the mounting plate 13, so that the first support element 14 seals the gap between the cover body 11 and the mounting plate 13 and also prevents gases from entering the interior of the housing 2 from the outside and coming into contact with the cell arrangement.

[0044] Secondly, the first support element 14 is in close contact with the cover body 11 and the mounting plate 13, thus preventing dust or dirt from coming into contact with the sealing element 16 from the outside, and keeping the sealing element 16 in a relatively ideal and controllable condition. For example, the first support element 14 can prevent corrosion or damage to the sealing element 16 due to the ingress of electrolyte into the area where the sealing element 16 is located.

[0045] In a third aspect, the first support element 14 is in close contact with the cover body 11 and the mounting plate 13, so that the first support element 14 can provide a relatively ideal and controllable condition for the connection 12, resulting in a stable insulation resistance of the connection 12.

[0046] Furthermore, the hardness of the second support element 15 is greater than that of the first support element 14, and the first support element 14 is in close contact with the cover body 11 and the mounting plate 13, which prevents breakage of the second support element 15, the cover body 11 or the mounting plate 13 caused by mutual pressure between the relatively hard second support element 15 and the cover body 11 and the mounting plate 13.

[0047] As in Fig. As shown in Figure 2, along the first direction X, the projection of the first support element 14 onto the cover body 11 exceeds the projection of the mounting plate 13 onto the cover body 11. This results in a larger contact area between the mounting plate 13 and the first support element 14, thus providing better support for the mounting plate 13. The mounting plate 13 has a greater hardness than the first support element 14, so the thickness of the portion of the first support element 14 extruded by the mounting plate 13 along the first direction X is less than the thickness of the portion not extruded by the mounting plate 13. This makes it difficult for dust or dirt from the outside to penetrate between the mounting plate 13 and the cover body 11.

[0048] As in Fig. As shown in Figure 6, when the upper cover 1 is in the second state, the temperature of the battery cell 10 rises above the normal operating temperature, causing the first support element 14 to melt at least partially and lose its shape (the first support element 14 in its molten state is not shown in the figure). In this case, the mounting plate 13 and the terminal 12 move downwards relative to the first state, the second support element 15 rests against the cover body 11 and the mounting plate 13, and the second support element 15 serves to support the mounting plate 13 and the terminal 12, thus preventing a short circuit caused by direct or indirect contact between the terminal 12 and the cover body 11.The second support element 15 consists of ceramic, glass or similar material and has properties such as insulation, high temperature resistance, minimal deformation at high temperatures, high strength and high hardness.

[0049] Furthermore, several second support elements 15 are provided along a circumferential direction of the connection 12, or only one second support element 15 is provided which has an annular cross-section, so that if the first support element 14 melts and can no longer support the mounting plate 13, the second support element 15 can stably support the mounting plate 13.

[0050] For example, in the first state, the sealing element 16 has a first compressed dimension D1 along the first direction X, and in the second state, a second compressed dimension D2 along the first direction X. The second compressed dimension D2 is larger than the first compressed dimension D1. That is, when the top cover 1 transitions from the first state to the second state, the degree of compression of the sealing element 16 in the first direction X decreases, but the sealing element 16 remains in a compressed state. Thus, in both the first and second states, the sealing element 16 can achieve a sealing effect between the cover body 11 and the port 12 to prevent external gases from entering the interior of the housing 2 and coming into contact with the cell assembly.

[0051] In the prior art, if the first support element 14 melts and loses its shape, the seal of the gap between the cover body 11 and the terminal 12 by the sealing element 16 can also fail, thereby compromising the sealing performance inside the battery cell 10. Therefore, the battery cell 10 is equipped with a fuse structure. If a short circuit occurs in the battery, the fuse structure can melt at a high temperature, thus preventing a continuous temperature increase at the terminal 12 and preventing any impairment of the airtightness inside the battery cell 10 due to the first support element 14 melting and losing its shape.Since one implementation principle of the fuse structure is to reduce the cross-sectional area at a connection point, the arrangement of the fuse structure can increase the internal resistance of battery cell 10, leading to a greater power loss of battery cell 10. Furthermore, the fuse structure has low reliability, and after it melts, the problem arises that a continuous temperature increase at terminal 12 cannot be prevented in the event of a short circuit.

[0052] In the present disclosure, the sealing element 16 is in a relatively highly compressed state in the first state and in a relatively weakly compressed state in the second state, so that if the first support element 14 melts and fails in the second state, the sealing element 16 can still seal the gap between the cover body 11 and the terminal 12, thereby maintaining the airtightness inside the battery cell 10. Therefore, it is not necessary to provide a backup structure, thus reducing the power consumption of the battery cell 10 during use.

[0053] In some embodiments, an uncompressed dimension of the sealing element 16 along the first direction X is a fourth dimension D, wherein a ratio of the first compressed dimension D1 to the fourth dimension D satisfies 55 % ≤ D1 / D ≤ 75 %, and a ratio of the second compressed dimension D2 to the fourth dimension D satisfies 75 % ≤ D2 / D ≤ 95 %.

[0054] For example, the ratio of the first compressed dimension D1 to the fourth dimension D can be 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, or the like.

[0055] The ratio of the first compressed dimension D1 to the fourth dimension D should not be excessively large or excessively small. If the ratio of the first compressed dimension D1 to the fourth dimension D is excessively small (e.g., less than 55%), the sealing element 16 will be more compressed in the first state, resulting in a greater force between the sealing element 16 and the cover body 11 and the projection 122, and a greater force between the first support element 14 and the mounting plate 13 and the cover body 11. This makes the upper cover 1 susceptible to damage, which affects its service life. If the ratio of the first compressed dimension D1 to the fourth dimension D is excessively large (e.g., less than 55%), the sealing element 16 will be more compressed in the first state. This results in a greater force between the first support element 14 and the mounting plate 13 and the cover body 11, making the upper cover 1 more susceptible to damage, which affects its service life.If the compression is greater than 75%), the sealing element 16 is compressed less, and when the upper cover 1 transitions from the first state to the second state, the sealing element 16 cannot maintain an airtight seal inside the battery cell 10 effectively. Therefore, the ratio of the first compressed dimension D1 to the fourth dimension D should be within a suitable range.

[0056] The ratio of the second compressed dimension D2 to the fourth dimension D can be, for example, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, or the like.

[0057] The ratio of the second compressed dimension D2 to the fourth dimension D should not be too large or too small. If the ratio of the second compressed dimension D2 to the fourth dimension D is too small (e.g., less than 75%), the sealing element 16 can be compressed more in the first state. If the ratio of the second compressed dimension D2 to the fourth dimension D is too large (e.g., greater than 95%), the sealing element 16 can be compressed less in the second state, which impairs the reliability of the seal between the cover body 11 and the connection 12 by the sealing element 16 in the second state. Therefore, the ratio of the second compressed dimension D2 to the fourth dimension D should be within a suitable range.

[0058] It is understood that along the first direction X, if a difference between the dimension of the mounting cavity and the dimension of the second support element 15 is a first difference, and a difference between the second compressed dimension D2 and the first compressed dimension D1 is a second difference, the first difference is equal to the second difference.

[0059] In some embodiments, such as in Fig. 2, Fig. 3 and Fig. As shown in Figure 7, one side of the cover body 11, facing the mounting plate 13, is provided with a first mounting groove 112, and one side of the mounting plate 13, facing the cover body 11, is provided with a second mounting groove 131. Along the first direction X, the mounting opening 142 penetrates the first support element 14, so that the second support element 15 extends into the first mounting groove 112 and the second mounting groove 131. The first mounting groove 112 can restrict the movement of the second support element 15 relative to the cover body 11, and the second mounting groove 131 can restrict the movement of the second support element 15 relative to the mounting plate 13, thereby stabilizing the position of the second support element 15.

[0060] In some embodiments, along the first direction X, a dimension of the second mounting groove 131 is larger than the difference between the dimension of the mounting cavity and the dimension of the second support element 15, so that when the upper cover 1 is in the first state, the second support element 15 can also extend into the second mounting groove 131.

[0061] As in Fig. 2 and Fig. As shown in Figure 6, the cover body 11 has a first dimension A along the first direction X, the first dimension A has a first tolerance t A The body 121 has a second dimension B1, and the second dimension B1 has a second tolerance t B1 the first support element 14 has a third dimension C, the third dimension C has a third tolerance tc, the second support element 15 has a fifth dimension F, the fifth dimension F has a fifth tolerance t FThe first mounting groove 112 has a sixth dimension A1, the sixth dimension A1 has a sixth tolerance t A1 The second mounting groove 131 has a seventh dimension E1, and the seventh dimension E1 has a seventh tolerance t E1 on.

[0062] When the upper cover 1 is in the first state, the first compressed dimension D1 has a first compressed tolerance t D1 When the upper cover 1 is in the second state, the second compressed dimension D2 has a second compressed tolerance t. D2 on.

[0063] The first tolerance t A , the third tolerance tc, the sixth tolerance t A1 , the seventh tolerance t E1 and the second tolerance t B1All dimensions are ±0.05 mm. The sixth dimension, A1, is less than half the first dimension, A, and the seventh dimension, E1, is less than half a dimension, E, of the mounting plate 13 along the first direction, X. The sealing element 16 is generally selected directly as a standard part. Common dimensions and tolerances are: 1.1 ± 0.05 mm, 1.2 ± 0.05 mm, 1.3 ± 0.05 mm, 1.4 ± 0.05 mm, and the like.

[0064] Accordingly, if the specification 1.1 ± 0.05 mm is selected for the sealing element 16, the first compressed dimension in the first state is in the range of 0.6325 to 0.7875 mm and the second compressed dimension in the second state is in the range of 0.7875 to 0.9927 mm. If the specification 1.2 ± 0.05 mm is selected for the sealing element 16, the first compressed dimension in the first state is in the range of 0.6875 to 0.8625 mm and the second compressed dimension in the second state is in the range of 0.8625 to 1.0925 mm. If the specification 1.3 ± 0.05 mm is selected for the sealing element 16, the first compressed dimension in the first state is in the range of 0.7425 to 0.9375 mm and the second compressed dimension in the second state is in the range of 0.9375 to 1.1875 mm.If the specification 1.4±0.05 mm is selected for the sealing element 16, the first compressed dimension in the first state is in the range of 0.7975 to 1.0125 mm and the second compressed dimension in the second state is in the range of 1.0125 to 1.2825 mm.

[0065] For example, the third tolerance tc is calculated using a root mean square method; and / or the fifth tolerance t F is calculated using the quadratic mean method.

[0066] Currently, tolerances are generally calculated using an extreme value method. This method is based on the assumption that all constituent rings simultaneously reach their limit deviations. Due to the extremely low probability of these limit deviations occurring, a tolerance in a closed-loop control system becomes excessively compressed, and even an achievable value cannot be calculated for a closed-loop system.

[0067] In the present disclosure, the variance is calculated using the mean square method. The mean square method is based on the assumption that the deviations of all sub-rings follow a normal distribution and that the deviations of some sub-rings can cancel each other out. Since the dimensional deviations in actual manufacturing correspond to the dimensional distribution, the calculation using the mean square method can lead to results that better reflect reality.

[0068] For example, the first compressed dimension D1 satisfies: D1=B1-CA, and the first compressed tolerance t D1 fulfilled: t D1 2 = t B1 2 +t C 2 +t A 2

[0069] If the first compressed dimension lies between 0.6325 and 0.7875 mm, then the first compressed dimension D1 and the first compressed tolerance t satisfy D1: 0.71±0.0775 mm, and it is calculated that the third dimension C and the third tolerance tc satisfy 2.29±0.0317 mm.

[0070] If the first compressed dimension lies between 0.6875 and 0.8625 mm, then the first compressed dimension D1 and the first compressed tolerance t satisfy D1 : 0.775 ± 0.0875 mm, and it is calculated that the third dimension C and the third tolerance tc satisfy 2.225 ± 0.0515 mm.

[0071] If the first compressed dimension lies between 0.7425 and 0.9375 mm, the first compressed dimension D1 and the first compressed tolerance t satisfy D1 : 0.84±0.0975 mm, and it is calculated that the third dimension C and the third tolerance tc satisfy 2.16±0.0671 mm.

[0072] If the first compressed dimension is between 0.7975 and 1.0125 mm, then the first compressed dimension D1 and the first compressed tolerance t satisfy D1: 0.905 ± 0.1075 mm, and it is calculated that the third dimension C and the third tolerance tc satisfy 2.095 ± 0.0810 mm.

[0073] For example, the second compressed dimension D2 satisfies: D2=B1+E1+A1-FA, and the second compressed tolerance t D2 fulfilled: t D2 2 =t B1 2 +t E1 2 +t A1 2 +t F 2 +t A 2

[0074] If the second compressed dimension lies between 0.7875 and 0.9927 mm, then the second compressed dimension D2 and the second compressed tolerance t satisfy D2 : 0.8901±0.1026 mm, and the fifth dimension F and the fifth tolerance t F Meet: 3.1099±0.0230 mm.

[0075] If the second compressed dimension lies between 0.8625 and 1.0925 mm, the second compressed dimension D2 and the second compressed tolerance t satisfy D2: 0.9775±0.1150 mm, and the fifth dimension F and the fifth tolerance t F Meet: 3.0225±0.0568 mm.

[0076] If the second compressed dimension lies between 0.9375 and 1.1875 mm, the second compressed dimension D2 and the second compressed tolerance t satisfy D2 : 1.0625 ± 0.1250 mm, and the fifth dimension F and the fifth tolerance t F Meets: 2.9375 ± 0.0750 mm.

[0077] If the second compressed dimension lies between 1.0125 and 1.2825 mm, the second compressed dimension D2 and the second compressed tolerance t satisfy D2 : 1.1475 ± 0.1350 mm, and the fifth dimension F and the fifth tolerance t F Meets: 2.8525 ± 0.0907 mm.

[0078] In some other embodiments, one side of the cover body 11 facing the mounting plate 13 is provided with a first mounting groove 112, or one side of the mounting plate 13 facing the cover body 11 is provided with a second mounting groove 131. Along the first direction X, the mounting opening 142 penetrates the first support element 14, so that the second support element 15 extends into the first mounting groove 112 or the second mounting groove 131. By arranging a groove structure only on one side of the second support element 15, the structure of the upper cover 1 can be simplified and the cost of the upper cover 1 reduced.

[0079] In order for the second support element 15 to extend along the first direction X into the first mounting groove 112 and / or the second mounting groove 131, one dimension of the second support element 15 is larger than that of the first support element 14.

[0080] Some embodiments of the present disclosure provide a teaching for assembling the battery cell 10. As in Fig. As shown in Figure 8, the assembly of the battery cell 10 includes the assembly of the top cover 1. The jig for assembling the top cover 1 comprises the following steps.

[0081] S1: The second support element 15 is attached in a mounting opening 142 of the first support element 14.

[0082] In this step, the second support element 15 and the first support element 14 can be mounted manually by an operator or automatically by a robot arm.

[0083] S2: The second support element 15 is attached to the cover body 11.

[0084] If the cover body 11 is provided with the first mounting groove 112 in this step, it is necessary that the second support element 15 extends into the first mounting groove 112 and that the second through-opening 141 of the first support element 14 corresponds to the first through-opening 111 of the cover body 11, thereby facilitating the installation of the connection 12 in the following steps.

[0085] S3: The sealing element 16 is attached to the connection 12.

[0086] In this step, the sealing element 16 is pushed over an outer circumference of the body 121, and the sealing element 16 rests against the projection 122.

[0087] S4: The connection 12 is carried through a first through-opening 111 of the cover body 11.

[0088] In this step, after the connection 12 passes successively through the first through-opening 111 and the second through-opening 141, the sealing element 16 rests against the cover body 11 along the first direction X.

[0089] S5: The connector 12 is connected to the mounting plate 13.

[0090] In this step, if the mounting plate 13 with the second mounting groove 131 is provided, the second support element 15 must extend into the second mounting groove 131, and then the connector 12 and the mounting plate 13 are welded together. In this case, the sealing element 16 is compressed.

[0091] Some embodiments of the present disclosure provide a battery device. As in Fig. As shown in Figure 9, the battery device comprises the battery cell 10. The battery device comprises one or more of a battery module, a battery pack, and an energy storage battery.

[0092] For example, the battery device comprises a box body. The box body provides a receiving space for the battery cell 10. Several battery cells 10 can be provided, and these multiple battery cells 10 can be connected in series, parallel, or in a series-parallel combination. "Series-parallel combination" means that the multiple battery cells 10 are connected in both series and parallel. The multiple battery cells 10 can be connected directly in series or parallel, or in a series-parallel combination, and then the assembly formed by the multiple battery cells 10 can be housed in the box body.Naturally, in the battery device, the multiple battery cells 10 can alternatively be first connected in series, parallel, or in a series-parallel combination to form a battery module, and then multiple battery modules are connected in series, parallel, or in a series-parallel combination to form an assembly and are housed in the box body. The battery device can further comprise other structures. For example, the battery device can also include a busbar to establish electrical connections between the multiple battery cells 10.

[0093] Furthermore, the mounting plate 13 is connected to at least one battery cell 10. That is, the mounting plate 13 can be a busbar, thus simplifying the structure of the battery cell 10. For example, the busbar can be connected to two battery cells 10. In this case, the busbar is connected to the positive terminal and the negative terminal of each of two adjacent battery cells 10, respectively, to connect the adjacent battery cells 10 in series. Alternatively, the busbar can be connected to a single battery cell 10. In this case, the busbar connects the positive terminal of the battery cell 10 to the positive electrode of the battery device or connects the negative terminal of the battery cell 10 to the negative electrode of the battery device.

[0094] Some embodiments of the present disclosure provide a teaching for assembling a battery device. As in Fig. As shown in 10, the assembly of the battery device comprises the following steps.

[0095] S1: The second support element 15 is attached in a mounting opening 142 of the first support element 14.

[0096] In this step, the second support element 15 and the first support element 14 can be mounted manually by an operator or automatically by a robot arm.

[0097] S2: The second support element 15 is attached to the cover body 11.

[0098] If the cover body 11 is provided with the first mounting groove 112 in this step, it is necessary that the second support element 15 extends into the first mounting groove 112 and the second through-opening 141 of the first support element 14 must correspond to the first through-opening 111 of the cover body 11, thereby facilitating the installation of the connection 12 in the following steps.

[0099] S3: The sealing element 16 is attached to the connection 12.

[0100] In this step, the sealing element 16 is pushed over an outer circumference of the body 121, and the sealing element 16 rests against the projection 122.

[0101] S4: The connection 12 is carried through a first through-opening 111 of the cover body 11.

[0102] In this step, after the connection 12 passes successively through the first through-opening 111 and the second through-opening 141, the sealing element 16 rests against the cover body 11 along the first direction X.

[0103] S6: The mounting plate 13 is connected to at least one terminal 12.

[0104] In this step, if the mounting plate 13 (e.g., a busbar) with the second mounting groove 131 is provided, the second support element 15 extends into the second mounting groove 131, and then the mounting plate 13 and the at least one connection 12 are welded together. In this case, the sealing element 16 is compressed.

[0105] Some embodiments of the present disclosure provide a power consumption device. The power consumption device includes a battery device. The battery device is configured to supply electrical energy. The power consumption device may, but is not limited to, be a mobile phone, a tablet computer, a laptop computer, an electric toy, a power tool, an electric scooter, an electric vehicle, a ship, a spacecraft, or the like. The electric toy may include a stationary or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, and an electric airplane toy. The spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, and the like.

[0106] Some embodiments of the present disclosure provide an energy storage device. The energy storage device comprises a battery device. The battery device is configured to supply electrical energy. The energy storage device may be, among other things, an energy storage container, an energy storage cabinet, an energy storage power plant, an energy storage battery pack, a portable energy storage system, or the like.

[0107] For example, energy storage technology is evolving towards long-duration energy storage. For energy storage requirements of 4 to 8 hours or even longer, the industry generally uses large-format and high-capacity battery cells as solutions. Such battery cells can effectively increase the energy density of the system.

[0108] The foregoing are merely preferred embodiments of the present disclosure and are not intended to limit the present disclosure. For persons skilled in the art, the present disclosure may be subject to various modifications and variations. All modifications, equivalent substitutions, improvements, and the like made within the meaning and scope of the present disclosure should be included within the scope of protection of the present disclosure.

Claims

[1] A battery cell provided with a top cover (1) comprising the top cover (1): a cover body (11) which is provided with a first through-opening (111); a connection (12) comprising a body (121) and a projection (122), wherein the body (121) passes through the first through-hole (111); a mounting plate (13) which is connected to an end of the body (121) which is facing away from the projection (122), and a sealing element (16) provided between the cover body (11) and the projection (122), wherein a first support element (14) and a second support element (15) are provided between the cover body (11) and the mounting plate (13), wherein the first support element (14) is provided with a mounting opening (142), the mounting opening (142), the mounting plate (13) and the cover body (11) together form a mounting cavity and the second support element (15) is installed in the mounting cavity; along a first direction (X) a dimension of the mounting cavity is larger than a dimension of the second support element (15), and the first direction (X) is a thickness direction of the cover body (11); and along the first direction (X) a projection of the first support element (14) onto the cover body (11) extends beyond a projection of the mounting plate (13) onto the cover body (11). [2] Battery cell according to claim 1, wherein the upper cover (1) has a first state and a second state, In the first state, the first support element (14) rests against the cover body (11) and the mounting plate (13), and the sealing element (16) has a first compressed dimension D1 along the first direction (X); and In the second state, the second support element (15) rests against the cover body (11) and the mounting plate (13), and the sealing element (16) has a second compressed dimension D2 along the first direction (X), wherein the second compressed dimension D2 is larger than the first compressed dimension D1. [3] Battery cell according to claim 2, wherein along the first direction (X) an uncompressed dimension of the sealing element (16) is a fourth dimension D, a ratio of the first compressed dimension D1 to the fourth dimension D is satisfied: 55 % ≤ D1 / D ≤ 75 %, and a ratio of the second compressed dimension D2 to the fourth dimension D is satisfied: 75 % ≤ D2 / D ≤ 95 %. [4] Battery cell according to claim 2 or 3, wherein one side of the cover body (11) facing the mounting plate (13) is provided with a first mounting groove (112) and one side of the mounting plate (13) facing the cover body (11) is provided with a second mounting groove (131); and along the first direction (X) the mounting opening (142) penetrates the first support element (14) so ​​that the second support element (15) extends into the first mounting groove (112) and the second mounting groove (131). [5] Battery cell according to claim 4, wherein the first support element (14) has a third dimension C, the third dimension C has a third tolerance tc and the third tolerance tc is calculated by a quadratic mean method; and / or the second support element (15) has a fifth dimension F, the fifth dimension F has a fifth tolerance t F exhibits the fifth tolerance t F calculated using the quadratic mean value method. [6] Battery cell according to claim 5, wherein along the first direction (X) the cover body (11) has a first dimension A, the first dimension A having a first tolerance t A exhibits, the body (121) has a second dimension B1 and the second dimension B1 has a second tolerance t B1 exhibits; when the upper cover (1) is in the first state, the first compressed dimension D1 is a first compressed tolerance t D1 exhibits; and the first compressed dimension D1 D1=B1-CA is satisfied, and the first compressed tolerance t D1 t D1 2 =t B1 2 +t C 2 +t A 2 fulfilled. [7] Battery cell according to claim 6, wherein if the first compressed dimension D1 satisfies 0.71 ± 0.0775 mm, the third dimension C satisfies 2.29 ± 0.0317 mm; or If the first compressed dimension D1 satisfies 0.775 ± 0.0875 mm, then the third dimension C satisfies 2.225 ± 0.0515 mm; or If the first compressed dimension D1 satisfies 0.84 ± 0.0975 mm, then the third dimension C satisfies 2.16 ± 0.0671 mm; or If the first compressed dimension D1 satisfies 0.905 ± 0.1075 mm, then the third dimension C satisfies 2.095 ± 0.0810 mm. [8] Battery cell according to claim 5, wherein the cover body (11) has a first dimension A along the first direction (X), the first dimension A having a first tolerance t Aexhibits, the body (121) has a second dimension B1, the second dimension B1 has a second tolerance t B1 exhibits the first mounting groove (112) having a sixth dimension A1, the sixth dimension A1 having a sixth tolerance t A1 exhibits the second mounting groove (131) having a seventh dimension E1 and the seventh dimension E1 having a seventh tolerance t E1 exhibits; when the upper cover (1) is in the second state, the second compressed dimension D2 is a second compressed tolerance t D2 exhibits; and the second compressed dimension D2 D2=B1+E1+A1-FA is satisfied, and the second compressed tolerance t D2 t D2 2 =t B1 2 +t E1 2 +t A1 2 t F 2 +t A 2 fulfilled. [9] Battery cell according to claim 8, wherein if the second compressed dimension D2 satisfies 0.8901 ± 0.1026 mm, the fifth dimension F satisfies 3.1099 ± 0.0230 mm; or if the second compressed dimension D2 satisfies 0.9775 ± 0.1150 mm, and the fifth dimension F satisfies 3.0225 ± 0.0568 mm; or if the second compressed dimension D2 satisfies 1.0625 ± 0.1250 mm, and the fifth dimension F satisfies 2.9375 ± 0.0750 mm; or if the second compressed dimension D2 satisfies 1.1475 ± 0.1350 mm, and the fifth dimension F satisfies 2.8525 ± 0.0907 mm. [10] Battery cell according to claim 2 or 3, wherein one side of the cover body (11) facing the mounting plate (13) is provided with a first mounting groove (112) or one side of the mounting plate (13) facing the cover body (11) is provided with a second mounting groove (131); and along the first direction (X) the mounting opening (142) penetrates the first support element (14) so ​​that the second support element (15) extends into the first mounting groove (112) or the second mounting groove (131). [11] Battery cell according to any one of claims 1 to 10, wherein along the first direction (X) a dimension of the second support element (15) is larger than a dimension of the first support element (14). [12] Battery cell according to one of claims 1 to 11, wherein several second support elements (15) are provided along a circumferential direction of the connection (12); or the second support element (15) is annular. [13] Battery cell according to one of claims 1 to 12, wherein the second support element (15) is made of ceramic. [14] Battery device comprising the battery cell (10) according to any one of claims 1 to 13, wherein the battery device comprises one or more of a battery module, a battery pack and an energy storage battery. [15] Battery device according to claim 14, wherein the mounting plate (13) is connected to at least one battery cell (10). [16] Power consumption device, wherein the power consumption device comprises the battery device according to claim 14 or 15 and the battery device is configured to supply electrical energy. [17] Energy storage device, wherein the energy storage device comprises the battery device according to claim 14 or 15 and the battery device is configured to supply electrical energy.

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