Battery

Abstract

The utility model discloses a battery, which comprises a first shell, a second shell, a third shell and a fourth shell, the first shell is provided with a storage cavity, and a first groove is formed around the cavity wall of the storage cavity; the second shell comprises a first body part and a first protruding part, the first protruding part is connected to the first body part, the first protruding part protrudes relative to the first body part, the first protruding part is arranged in the storage cavity, and the first protruding part is connected to the groove wall of the first groove. The battery provided by the utility model can have relatively high energy density.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a battery. Background Art

[0002] In the related art, a steel shell battery is made by using a steel shell as a housing to encapsulate a lithium battery cell. Among them, the steel shell battery has the characteristic of high strength, which can effectively prevent the battery cell inside the housing from being damaged by impact and extrusion.

[0003] The existing steel shell battery includes a housing and an end plate. There is a storage cavity inside the housing, and the storage cavity is used to place the battery. At least a part of the end plate is arranged in the storage cavity to close the opening of the storage cavity. Among them, after a part of the end plate is arranged in the storage cavity, a part of the end plate and a part of the housing will overlap, which will indirectly reduce the space of the storage cavity, resulting in a lower energy density of the battery. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a battery, which can have a higher energy density.

[0005] The battery according to the embodiment of the utility model includes:

[0006] A first housing having a storage cavity, and a first groove is circumferentially arranged on the cavity wall of the storage cavity;

[0007] A second housing includes a first body portion and a first protruding portion. The first protruding portion is connected to the first body portion, the first protruding portion protrudes relative to the first body portion, the first protruding portion is arranged in the storage cavity, and the first protruding portion is connected to the groove wall of the first groove.

[0008] The battery according to the embodiment of the utility model has at least the following beneficial effects: By arranging a first groove on the cavity wall of the storage cavity of the first housing and connecting the first protruding portion of the second housing to the groove wall of the first groove, thus, although there is partial overlap between the first protruding portion and the first housing, because the first protruding portion is connected to the first groove, this can effectively prevent the thickness of the housing from increasing, resulting in a reduction in the space of the storage cavity. In the prior art, after the housing and the end plate are connected, the space of the storage cavity will be reduced, resulting in a smaller capacity of the housing to accommodate the battery, while in this application, this problem can be effectively avoided. In this way, the battery can have a higher energy density.

[0009] In the battery according to some embodiments of the utility model, the second housing further includes a first limiting portion. The first limiting portion is connected to the first body portion, the first limiting portion protrudes relative to the first protruding portion, and the first limiting portion abuts against the first housing.

[0010] For a battery according to some embodiments of the present utility model, the battery further includes a third housing, a second groove is disposed around the wall of the storage cavity, the first groove and the second groove are disposed opposite to each other, the third housing includes a second body portion and a second protruding portion, the second protruding portion is connected to the second body portion, the second protruding portion protrudes relative to the second body portion, the second protruding portion is disposed in the storage cavity, and the second protruding portion is connected to the wall of the second groove.

[0011] For a battery according to some embodiments of the present utility model, the third housing further includes a second limiting portion, the second limiting portion is connected to the second body portion, the second limiting portion protrudes relative to the second protruding portion, and the second limiting portion abuts against the first housing.

[0012] For a battery according to some embodiments of the present utility model, the battery further includes an insulating layer, the first groove includes a first half groove and a second half groove that communicate with each other, the first half groove and the second half groove are distributed along the length direction of the battery, the insulating layer is disposed in the first half groove, and the first protruding portion is disposed in the second half groove.

[0013] For a battery according to some embodiments of the present utility model, along the length direction of the battery, the size of the first groove is greater than the size of the first protruding portion.

[0014] For a battery according to some embodiments of the present utility model, along the width direction of the battery, the sum of the size of the first protruding portion and the wall thickness of the first groove is not greater than the wall thickness of the storage cavity.

[0015] For a battery according to some embodiments of the present utility model, along the length direction of the battery, the size of the first groove is D, and 4 mm ≤ D ≤ 15 mm.

[0016] For a battery according to some embodiments of the present utility model, along the length direction of the battery, the size of the first protruding portion is B, and 2 mm ≤ B ≤ 10 mm.

[0017] For a battery according to some embodiments of the present utility model, along the width direction of the battery, the size of the first protruding portion is A, the wall thickness of the storage cavity is C, and A ≤ 1 / 2 C.

[0018] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. Description of the Drawings

[0019] The following further describes the present utility model in conjunction with the drawings and embodiments, where:

[0020] Figure 1 Schematic diagram of the battery according to the first embodiment of the present utility model;

[0021] Figure 2 Schematic diagram of the battery according to the second embodiment of the present utility model;

[0022] Figure 3 Schematic diagram of the battery according to the third embodiment of the present utility model;

[0023] Figure 4 Schematic diagram of the battery according to the fourth embodiment of the present utility model.

[0024] Reference numerals:

[0025] Battery 10, first housing 100, storage cavity 110, first groove 120, first half groove 121, second half groove 122, second groove 130, second housing 200, first body portion 210, first protrusion 220, first limiting portion 230, third housing 300, second body portion 310, second protrusion 320, second limiting portion 330, insulating layer 400, battery cell 500, terminal post 600. Detailed description of the embodiments

[0026] The following describes in detail the embodiments of the present utility model. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0027] In the description of the present utility model, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0028] In the description of the present utility model, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or the sequence relationship of the indicated technical features.

[0029] In the description of the present utility model, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0030] In the description of the present utility model, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0031] In the related art, the steel shell battery is made by using a steel shell as a housing to encapsulate a lithium battery cell. Among them, the steel shell battery has the characteristic of high strength, which can effectively prevent the lithium battery cell inside the housing from being damaged by impact and extrusion.

[0032] The existing steel shell battery includes a housing and an end plate. There is a storage cavity 110 inside the housing, and the storage cavity 110 is used to place the battery 10. At least a part of the end plate is arranged in the storage cavity 110, so as to close the opening of the storage cavity 110. Among them, after a part of the end plate is arranged in the storage cavity 110, a part of the end plate and a part of the housing will overlap, which will indirectly reduce the space of the storage cavity 110, resulting in a lower energy density of the battery 10. For this reason, the present application proposes a battery 10.

[0033] Please refer to Figures 1 to 3, in some embodiments, the battery 10 includes: a battery cell 500, a first housing 100, and a second housing 200. The first housing 100 has a storage cavity 110. The storage cavity 110 is used to place the battery cell 500. Among them, the material of the first housing 100 is a metal material, such as iron, aluminum alloy, or stainless steel. The shape of the first housing 100 is a cuboid, a cube, or a cylinder. A first groove 120 is provided around the cavity wall of the storage cavity 110. Specifically, the first groove 120 is provided at one end of the storage cavity 110. The second housing 200 includes a first body portion 210 and a first protruding portion 220. The first protruding portion 220 is connected around the first body portion 210, and the first protruding portion 220 protrudes relative to the first body portion 210. The first protruding portion 220 and the first body portion 210 can define a cavity. In this way, the cross-section of the first housing 100 can be in the shape of "]". Among them, the first protruding portion 220 is disposed in the storage cavity 110, and the first protruding portion 220 is connected to the groove wall of the first groove 120. In this way, the first housing 100 can close the opening of the storage cavity 110, so that the first housing 100 and the second housing 200 together encapsulate the battery cell 500 to protect the battery 10.

[0034] Further, by providing the first groove 120 on the cavity wall of the storage cavity 110 of the first housing 100 and connecting the first protruding portion 220 of the second housing 200 to the groove wall of the first groove 120, in this way, although there is partial overlap between the first protruding portion 220 and the first housing 100, since the first protruding portion 220 is connected to the first groove 120, this can effectively prevent the thickness of the housing from increasing, thereby causing the space of the storage cavity 110 to decrease. In the prior art, after the housing and the end plate are connected, the space of the storage cavity 110 will be reduced, resulting in a smaller capacity of the housing to accommodate the battery 10, while in the present application, this problem can be effectively avoided. In this way, the battery 10 can have a higher energy density.

[0035] In addition, it should be supplemented that in the prior art, the battery 10 has another structure. The battery 10 includes a housing and a cover plate. The battery cell 500 is placed inside the housing, and then the cover plate seals the battery cell 500 in the housing. The manufacturing steps of the battery 10 are as follows: the battery cell 500 is placed in the housing, and then the tabs of the battery cell 500 are welded to the housing. That is, the negative tab of the battery cell 500 is welded to the housing, and the positive tab of the battery cell 500 is welded to the terminal post 600 (the terminal post 600 is insulated from the housing). After that, the cover plate is welded to the housing to complete the sealing. Among them, in the prior art, after the battery cell 500 is placed in the housing, the space between the battery cell 500 and the housing is small, which is inconvenient for welding. In the present application, the tabs of the battery cell 500 can be welded to the first body portion 210 of the second housing 200 first. The terminal post 600 is provided on the first body portion 210. Then, the first housing 100 and the second housing 200 are connected, which can improve the installation efficiency. The connection method between the first housing 100 and the second housing 200 can be bonding, welding, etc. That is, the first protrusion 220 is welded to the wall of the first groove 120. In addition, in the prior art, flange edges are provided on both the housing and the cover plate to facilitate welding. Therefore, after the housing and the cover plate are welded, the flange edges need to be cut off, which will bring a complex manufacturing process. In the present application, the first housing 100 and the second housing 200 do not have flange edges, so the step of cutting off the flange edges can be omitted, thus saving time and cost.

[0036] Further, please refer to Figures 1 to 3 , in some embodiments, the second housing 200 further includes a first limiting portion 230. The first limiting portion 230 is connected to the first body portion 210, and the first limiting portion 230 protrudes relative to the first protrusion 220. Please refer to Figure 1 , in Figure 1 , the first protrusion 220 protrudes leftward relative to the first body portion 210, and the first limiting portion 230 protrudes radially relative to the first protrusion 220. Among them, the first limiting portion 230 abuts against the first housing 100. Specifically, when installing the first housing 100 and the second housing 200, the first limiting portion 230 can abut against the end face of the first housing 100, so as to remind the installer that the second housing 200 is installed in place.

[0037] Further, as mentioned above, the battery 10 includes a first housing 100 and a second housing 200, that is, the housing of the battery 10 includes two parts. Among them, in some other ways, the housing of the battery 10 can include three parts. Specifically, please refer to Figures 1 to 3, in some embodiments, the battery 10 further includes a third housing 300. A second groove 130 is provided around the cavity wall of the storage cavity 110, and the first groove 120 is disposed opposite to the second groove 130. That is to say, the first groove 120 may be located at the head position of the first housing 100, and the second groove 130 may be located at the tail position of the first housing 100. Alternatively, the first groove 120 may be at one end of the first housing 100, and the second groove 130 may be at the other end of the second housing 200. The third housing 300 includes a second body portion 310 and a second protruding portion 320. The second protruding portion 320 is connected around the second body portion 310, and the second protruding portion 320 protrudes relative to the second body portion 310. The second protruding portion 320 and the second body portion 310 may define a cavity. The second protruding portion 320 is disposed in the storage cavity 110, and the second protruding portion 320 is connected to the groove wall of the second groove 130. Specifically, the storage cavity 110 of the first housing 100 has two opposite openings, and the second housing 200 and the third housing 300 may enclose the storage cavity 110. After the second housing 200 and the third housing 300 are connected to the first housing 100, due to the provision of the first groove 120 and the second groove 130, even if a part of the first protruding portion 220 overlaps with the groove wall of the first groove 120, and a part of the second protruding portion 320 overlaps with the groove wall of the second groove 130, the space of the storage cavity 110 will not be reduced, so that the battery 10 has a high energy density.

[0038] Further, please refer to Figures 1 to 3 , in some embodiments, the third housing 300 further includes a second limiting portion 330. The second limiting portion 330 is connected to the second body portion 310, and the second limiting portion 330 protrudes relative to the second protruding portion 320. Please refer to Figure 1 , in Figure 1 , the second protruding portion 320 protrudes to the right relative to the second body portion 310, and the second limiting portions 330 protrude radially relative to the second protruding portion 320 respectively. Among them, the second limiting portion 330 abuts against the first housing 100. Specifically, when installing the first housing 100 and the third housing 300, the second limiting portion 330 may abut against the end face of the first housing 100, thereby reminding the installer that the third housing 300 is installed in place.

[0039] Further, please refer to Figures 1 to 3, in some embodiments, the battery 10 further includes an insulating layer 400. The insulating layer 400 can be used to effectively prevent the tab from contacting the first housing 100. The material of the insulating layer 400 can be adhesive paper. The first groove 120 includes a first half groove 121 and a second half groove 122 that communicate with each other, and the first half groove 121 and the second half groove 122 are distributed along the length direction of the battery 10. The insulating layer 400 is disposed in the first half groove 121, and the first protrusion 220 is disposed in the second half groove 122. Specifically, after the tab of the battery cell 500 is welded to the second housing 200, the tab may be bent and folded in the storage cavity 110. At this time, if the positive tab contacts the first housing 100, and the first housing 100 is the negative electrode of the battery 10, this will cause the battery 10 to short-circuit. Therefore, after the insulating layer 400 is disposed in the first half groove 121, even if the tab is bent, the tab will abut against the insulating layer 400 and thus will not contact the first housing 100, which can improve the safety of the battery 10.

[0040] Further, please refer to Figure 4 , in some embodiments, along the length direction of the battery 10, the size of the first groove 120 is larger than the size of the first protrusion 220. Specifically, along the length direction of the battery 10, the size of the first groove 120 can be the depth of the first groove 120, and the size of the first protrusion 220 can be the length of the first protrusion 220. Among them, if the size of the first protrusion 220 is larger than the size of the first groove 120, then a part of the first protrusion 220 will be in the first groove 120 and the other part will not be in the first groove 120, which will cause the strength of the battery 10 to be too low (the thinnest part of the battery 10 is the first protrusion 220). In addition, this will also result in poor sealing of the battery 10.

[0041] Further, please refer to Figure 4 , in some embodiments, along the width direction of the battery 10, the sum of the size of the first protrusion 220 and the wall thickness of the first groove 120 is not greater than the wall thickness of the storage cavity 110. Specifically, along the width direction of the battery 10, the sum of the size of the first protrusion 220 and the wall thickness of the first groove 120 can be equal to the wall thickness of the storage cavity 110, or the sum of the size of the first protrusion 220 and the wall thickness of the first groove 120 can be less than the wall thickness of the storage cavity 110. After the first protrusion 220 is connected to the groove wall of the first groove 120, the setting of the first groove 120 can effectively prevent the first protrusion 220 from protruding relative to the wall surface of the storage cavity 110. Among them, when the sum of the size of the first protrusion 220 and the wall thickness of the first groove 120 is not greater than the wall thickness of the storage cavity 110, the first protrusion 220 will not protrude from the wall surface of the storage cavity 110, which can further ensure that the space of the storage cavity 110 is larger and a battery cell 500 with a larger volume can be placed, so that the energy density of the battery 10 is higher.

[0042] Further, please refer to Figure 4 , in some embodiments, along the length direction of the battery 10, the size of the first groove 120 is D, where 4 mm ≤ D ≤ 15 mm. Specifically, along the length direction of the battery 10, the size of the first groove 120 can be 4 mm, 5 mm, 8 mm, 10 mm, 12 mm, or 15 mm. When the size of the first groove 120 is less than 4 mm, due to the small size of the first groove 120, the processing will be difficult. When the size of the first groove 120 is greater than 15 mm, since the size of the first groove 120 is too large and the insulating layer 400 and the first protrusion 220 need to be arranged in the first groove 120, the sizes of the first protrusion 220 and the insulating layer 400 will be too large, resulting in waste of materials.

[0043] Further, please refer to Figure 4 , in some embodiments, along the length direction of the battery 10, the size of the first protrusion 220 is B, where 2 mm ≤ B ≤ 10 mm. Among them, the size of the first protrusion 220 can be 2 mm, 3 mm, 5 mm, 8 mm, or 10 mm. Since the first protrusion 220 and the first body portion 210 form a cavity, when the size of the first protrusion 220 is large, for example, when the size of the first protrusion 220 is greater than 10 mm, the depth of the cavity will be large, which will make it difficult to weld the tab and the first body portion 210 subsequently. When the size of the first protrusion 220 is less than 2 mm, due to the small size of the first protrusion 220, the connection area between the first protrusion 220 and the first groove 120 is small, resulting in low strength at the connection between the first housing 100 and the second housing 200.

[0044] Further, please refer to Figure 4 , in some embodiments, along the length direction of the battery 10, the size of the second groove 130 is F, and the size of the second protrusion 320 is G, where G ≤ F. Along the length direction of the battery 10, the size of the second groove 130 can be the depth of the second groove 130, and the size of the second protrusion 320 can be the length of the second protrusion 320. Among them, if the size of the second protrusion 320 is greater than the size of the second groove 130, then a part of the second protrusion 320 will be inside the second groove 130 and another part will be outside the second groove 130, resulting in too low strength of the battery 10 (the thinnest part of the battery 10 is the second protrusion 320). In addition, this will also result in poor sealing of the battery 10.

[0045] Further, please refer to Figure 4, in some embodiments, along the length direction of the battery 10, the size of the insulating layer 400 is E, and 3 mm ≤ B ≤ 10 mm. Specifically, the size of the insulating layer 400 can be 3 mm, 4 mm, 5 mm, 8 mm or 10 mm. Among them, when the size of the insulating layer 400 is less than 3 mm, due to the small size of the insulating layer 400, the tab may not be able to contact the insulating layer 400 and instead contact the first housing 100, which will cause a risk of short circuit in the battery 10. When the size of the insulating layer 400 is greater than 10 mm, while the insulating function of the insulating layer 400 is satisfied, it will cause waste of materials and lead to too high manufacturing cost of the battery 10.

[0046] Further, please refer to Figure 4 , in some embodiments, along the width direction of the battery 10, the size of the first protrusion 220 is A, and the wall thickness of the storage cavity 110 is C, and A ≤ 1 / 2C. Specifically, along the width direction of the battery 10, the size of the first protrusion 220 refers to the thickness of the first protrusion 220. Among them, when A ≤ 1 / 2C, the first protrusion 220 can be smoothly inserted into the first groove 120, and the connection strength at the first protrusion 220 and the first groove 120 can be ensured.

[0047] Further, please refer to Figure 4 , in some embodiments, along the width direction of the battery 10, the size of the first limiting portion 230 is H, and the wall thickness of the storage cavity 110 is C, and H ≤ 1 / 2C. Specifically, the size of the first limiting portion 230 can be half of the wall thickness of the storage cavity 110. If the size of the first limiting portion 230 is too large, then the first limiting portion 230 will extend beyond the surface of the first housing 100 in the width direction of the battery 10, which will particularly increase the volume of the battery 10.

[0048] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art to which the present invention pertains, various changes can be made without departing from the gist of the present invention. In addition, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

Claims

1. A battery, characterized in that, Comprising: A first housing having a storage cavity, and a first groove is circumferentially provided on the cavity wall of the storage cavity; A second housing includes a first body portion and a first protruding portion. The first protruding portion is connected to the first body portion and protrudes relative to the first body portion. The first protruding portion is disposed in the storage cavity and is connected to the groove wall of the first groove.

2. The battery according to claim 1, characterized in that, The second housing further includes a first limiting portion. The first limiting portion is connected to the first body portion and protrudes relative to the first protruding portion. The first limiting portion abuts against the first housing.

3. The battery according to claim 1, wherein The battery further includes a third housing. A second groove is circumferentially provided on the cavity wall of the storage cavity. The first groove and the second groove are oppositely arranged. The third housing includes a second body portion and a second protruding portion. The second protruding portion is connected to the second body portion and protrudes relative to the second body portion. The second protruding portion is disposed in the storage cavity and is connected to the groove wall of the second groove.

4. The battery according to claim 3, characterized in that, The third housing further includes a second limiting portion. The second limiting portion is connected to the second body portion and protrudes relative to the second protruding portion. The second limiting portion abuts against the first housing.

5. The battery according to claim 1, characterized in that, The battery further includes an insulating layer. The first groove includes a first half groove and a second half groove that communicate with each other. The first half groove and the second half groove are distributed along the length direction of the battery. The insulating layer is disposed in the first half groove, and the first protruding portion is disposed in the second half groove.

6. The battery according to claim 1, characterized in that, Along the length direction of the battery, the size of the first groove is larger than the size of the first protruding portion.

7. The battery according to claim 1, wherein Along the width direction of the battery, the sum of the size of the first protruding portion and the wall thickness of the first groove is not greater than the wall thickness of the storage cavity.

8. The battery according to claim 1, characterized in that, Along the length direction of the battery, the size of the first groove is D, and 4 mm ≤ D ≤ 15 mm.

9. The battery according to claim 1, characterized in that, Along the length direction of the battery, the size of the first protruding portion is B, and 2 mm ≤ B ≤ 10 mm.

10. The battery according to claim 1, characterized in that, Along the width direction of the battery, the size of the first protruding portion is A, and the wall thickness of the storage cavity is C, and A ≤ 1 / 2C.

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