Battery cell and battery pack with same

Abstract

The utility model provides a single battery and a battery pack with the single battery, the single battery comprises a shell, an accommodating cavity is formed in the shell, and an opening communicated with the accommodating cavity is formed at the top of the shell; the pole group is arranged in the accommodating cavity, and the pole group comprises a pole piece; the supporting piece comprises a supporting body and a connecting plate, the supporting body is arranged in the pole group, and the pole piece is wound on the outer side of the supporting body and forms a winding structure; and the cover plate assembly is arranged at the position of the opening and is connected with the connecting plate. According to the battery monomer disclosed by the utility model, the connecting edges are arranged on the supporting plate, and the supporting plate is matched with the cover plate assembly through the connecting edges to form a stable structure, so that pole group damage caused by vibration can be prevented, and the service life of the battery monomer can be further prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pack manufacturing, in particular to a battery monomer and a battery pack having the same. Background Art

[0002] In the existing solution, when the battery cell shakes, the electrode group inside the shell will shake with the shell, which may easily cause damage to the electrode group after collision with the shell, and may also easily cause the internal structure of the electrode group to tear, thereby affecting the service life of the battery cell. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery cell, which can increase the service life of the battery cell.

[0004] The utility model also provides a battery pack having the battery monomer.

[0005] The battery cell according to the embodiment of the utility model includes: a shell, a housing cavity is formed inside the shell, and an open mouth connected to the housing cavity is formed on the top of the shell; a pole group, the pole group is arranged in the housing cavity, and the pole group includes a pole piece; a support member, the support member includes: a supporting body and a connecting plate, the supporting body is arranged in the pole group, and the pole piece is wound on the outside of the supporting body to form a winding structure; a cover plate assembly, the cover plate assembly is arranged at the position of the open mouth and is connected to the connecting plate.

[0006] According to the battery cell of the utility model, a connecting edge is arranged on the support plate, and the support plate cooperates with the cover plate assembly through the connecting edge to form a stable structure, thereby preventing the electrode group from being damaged due to vibration, and further increasing the service life of the battery cell.

[0007] According to some embodiments of the present invention, the supporting body is formed as a plate body, and the connecting plate is connected to one side of the supporting body and is arranged beyond the edge of the supporting body.

[0008] According to some embodiments of the present invention, the cover plate assembly includes a lower plastic, and the connecting plate is connected to the lower plastic.

[0009] According to some embodiments of the present invention, the length of the connecting plate is not greater than the length of the supporting body.

[0010] According to some embodiments of the present invention, the thickness of the support member is in the range of 100um-500um.

[0011] According to some embodiments of the present invention, a plurality of grooves are formed on at least one side surface of the support member, the plurality of grooves are arranged in the length direction of the support member, and each of the grooves extends along the width direction of the support member.

[0012] According to some optional embodiments of the present invention, the depth of the groove is no more than 1 μm.

[0013] According to some embodiments of the present invention, the electrode group includes: a positive electrode sheet, a negative electrode sheet and a separator, the separator is arranged between the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet, the negative electrode sheet and the separator are stacked and then wound.

[0014] According to some embodiments of the present invention, a through hole is formed on the cover plate assembly, and the battery cell further includes: an explosion-proof valve, and the explosion-proof valve is arranged at the position of the through hole.

[0015] A battery pack according to an embodiment of the second aspect of the utility model includes a battery cell according to the first aspect of the utility model.

[0016] According to the battery pack of the utility model, by setting the battery cell of the first embodiment mentioned above, a connecting edge is set on the support plate, and the support plate cooperates with the cover plate assembly through the connecting edge to form a stable structure, thereby preventing damage to the electrode group due to vibration, and further increasing the service life of the battery cell.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a battery cell at one angle according to an embodiment of the first aspect of the utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram of another angle of the battery cell shown in ;

[0020] Figure 3 yes Figure 2 Schematic diagram of the pole group and support shown in;

[0021] Figure 4 yes Figure 3 A schematic diagram of an angle of the support member shown in ;

[0022] Figure 5 yes Figure 3 A schematic diagram of another angle of the support member shown in FIG.

[0023] Reference numerals:

[0024] 100. Battery cell;

[0025] 10. housing; 11. accommodating chamber;

[0026] 20. Pole group; 21. Positive electrode sheet; 22. Negative electrode sheet; 23. Separator; 24. Pole column; 25. Pole ear;

[0027] 30. Support member; 31. Support body; 311. Groove; 32. Connecting plate;

[0028] 40. Cover plate assembly; 41. Lower plastic;

[0029] 50. Explosion-proof valve;

[0030] 60. Insulating film;

[0031] 1000. Battery cell. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0033] Please refer to the following Figure 1-5 A battery cell 1000 according to an embodiment of the present invention is described.

[0034] Reference Figure 1 and Figure 2 According to an embodiment of the present invention, a battery cell 1000 includes: a housing 10 , a pole group 20 , a support member 30 and a cover plate assembly 40 .

[0035] Specifically, a housing 10 is formed with a housing cavity 11 inside, and an opening communicating with the housing cavity 11 is formed at the top of the housing 10; the pole group 20 is arranged in the housing cavity 11, and the pole group 20 includes a pole piece; the support member 30 includes: a support body 31 and a connecting plate 32, the support body 31 is arranged in the pole group 20, and the pole piece is wound on the outside of the support body 31 to form a winding structure; the cover plate assembly 40 is arranged at the position of the opening and connected to the connecting plate 32. Since the pole group 20 is a winding structure, the support plate is supported at the center of the wound pole piece, so that the support plate can provide support force to the pole piece, thereby effectively preventing the pole piece from wrinkling.

[0036] For example, Figure 1 and Figure 2As shown, the housing 10 is a rectangular housing 10, the top of the housing 10 is open to form an open opening, the interior of the housing 10 forms a receiving cavity 11, the support member 30 is vertically arranged, the pole group 20 and the support member 30 are arranged in the receiving cavity 11, the cover plate assembly 40 is covered at the open opening to seal the housing 10, and the upper end of the connecting plate 32 abuts against the lower side of the cover plate assembly 40. Preferably, the housing 10 is an aluminum shell, which can reduce the weight of the housing 10, thereby facilitating the transportation of the battery cell 1000, and the support member 30 is a mica sheet or a polyterephthalate resin plastic (PET), etc., which can ensure the insulation effect of the support member 30.

[0037] When assembling the battery pack monomer, first wind the electrode group 20 on the outside of the support body 31, then put the electrode group 20 and the support member 30 into the accommodating cavity 11, and finally cover the cover assembly 40 on the open mouth. It should be noted that the connecting plate 32 should be connected to the cover assembly 40. At this time, the assembly of the battery monomer 1000 is completed.

[0038] The battery cell 1000 of the present invention is provided with a connecting edge on the support plate, and the connecting edge is connected to the cover plate assembly 40. When the battery cell 1000 shakes, the connecting edge abuts against the cover plate assembly 40, so that the support member 30 of the electrode group 20 and the cover plate assembly 40 form a stable structure, which can effectively reduce the shaking of the electrode group 20 inside the shell 10, thereby preventing the electrode group 20 from being damaged after colliding with the shell 10. At the same time, it can also prevent the problem of tearing of the internal structure of the electrode group 20 due to vibration, thereby improving the service life of the battery cell 1000.

[0039] According to the battery cell 1000 of the embodiment of the utility model, a connecting edge is set on the support plate, and the support plate cooperates with the cover plate assembly 40 through the connecting edge to form a stable structure, thereby preventing the electrode group 20 from being damaged due to vibration, thereby improving the service life of the battery cell 1000.

[0040] According to some embodiments of the present invention, referring to Figure 2 and Figure 4 The support body 31 is formed as a plate body. The support body 31 of the plate body can reduce the space occupied by the support member 30 in the accommodating cavity 11, thereby providing more placement space for the pole group 20. The connecting plate 32 is connected to one side of the support body 31 (such as Figure 4 The upper side of the support body 31 shown in the figure) and is arranged beyond the edge of the support body 31, thereby facilitating the connection between the connecting plate 32 and the cover plate assembly 40.

[0041] Preferably, a weight-reducing hole may be provided on the support body 31 , so as to reduce the weight of the support body 31 , and further reduce the weight of the battery cell 1000 .

[0042] According to some embodiments of the present invention, referring to Figure 1 , Figure 2 and Figure 4 The cover plate assembly 40 includes a lower plastic 41, and the connecting plate 32 is connected to the lower plastic 41. Thus, the matching length between the connecting plate 32 and the cover plate assembly 40 can be reduced, so that the material used for the connecting plate 32 can be reduced, and the production cost can be reduced.

[0043] According to some embodiments of the present invention, referring to Figure 4 , the length of the connecting plate 32 is not greater than the length of the supporting body 31. Thus, limiting the length of the connecting plate 32 can prevent the connecting plate 32 from being too short to affect the strength of the connecting plate 32, and can also prevent the matching effect between the connecting plate 32 and the cover plate assembly 40. At the same time, it can also prevent the connecting plate 32 from being too long to affect the placement space of the pole group 20.

[0044] For example, Figure 4 As shown, the connecting plate 32 is connected to the upper side of the supporting body 31 , and the length of the connecting plate 32 is smaller than the length of the supporting body 31 , thereby forming a supporting member 30 of a convex structure.

[0045] According to some embodiments of the present invention, referring to Figure 4 and Figure 5 The thickness of the support member 30 is in the range of 100um-500um. Thus, limiting the thickness of the support member 30 can prevent the support member 30 from being too thin to affect the strength of the support member 30, and at the same time, it can also prevent the support member 30 from being too thick to affect the placement space of the pole group 20.

[0046] For example, Figure 4 and Figure 5 As shown, the thickness of the support member 30 can be: 100um, 200um, 300um, 400um or 500um.

[0047] According to some embodiments of the present invention, referring to Figure 4 and Figure 5 , a plurality of grooves 311 are formed on at least one side surface of the support member 30, that is, a plurality of grooves 311 may be formed on one side surface of the support member 30, or a plurality of grooves 311 may be formed on both sides of the support member 30, and the number of the grooves 311 may be two, three, or four or more, and the plurality of grooves 311 may be arranged in the length direction of the support member 30 (such as Figure 4 The grooves 311 are arranged in the left and right directions as shown in the figure, and each groove 311 is arranged in the width direction of the support member 30 (as shown in the figure). Figure 4 The upper and lower directions shown extend.

[0048] In this way, when the battery cell 1000 thermally runs away, the gas can flow along the groove 311, so that the gas can be discharged from the inside of the shell 10 conveniently, thereby preventing the gas in the shell 10 from being unable to be discharged and causing the thermal runaway to be further aggravated. At the same time, when the electrolyte is added to the shell 10, the electrolyte can flow along the groove 311 toward the pole piece, thereby facilitating the infiltration of the pole group 20, thereby ensuring the infiltration effect of the pole group 20.

[0049] According to some optional embodiments of the present invention, referring to Figure 4 The depth of the groove 311 is not greater than 1 μm. Thus, it is possible to prevent the groove 311 from being too deep to affect the strength of the support member 30 , and at the same time, it is possible to prevent the groove 311 from being too shallow to affect the exhaust effect in the housing 10 .

[0050] For example, Figure 4 As shown, the depth of the groove 311 may be 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm or 1 μm.

[0051] According to some embodiments of the present invention, referring to Figure 2 and Figure 3 The electrode group 20 includes: a positive electrode sheet 21, a negative electrode sheet 22 and a separator 23. The separator 23 is arranged between the positive electrode sheet 21 and the negative electrode sheet 22, and the positive electrode sheet 21, the negative electrode sheet 22 and the separator 23 are stacked and then wound. Thus, the positive electrode sheet 21 and the negative electrode sheet 22 form a closed loop, thereby ensuring the normal operation of the battery cell 1000. At the same time, the separator 23 can effectively prevent the positive electrode sheet 21 and the negative electrode sheet 22 from directly contacting each other, avoiding the free passage of electrons, thereby preventing the occurrence of internal short circuits.

[0052] According to some embodiments of the present invention, referring to Figure 1 , a through hole is formed on the cover plate assembly 40, and the battery cell 1000 further includes: an explosion-proof valve 50, which is arranged at the position of the through hole. Thus, the through hole provides an installation position for the explosion-proof valve 50, so that the installation of the explosion-proof valve 50 can be facilitated. At the same time, when the battery cell 1000 is thermally runaway, gas can be discharged from the battery cell 1000 from the explosion-proof valve 50, so as to avoid the battery cell 1000 from being unable to exhaust gas and causing explosion.

[0053] According to some embodiments of the present invention, referring to Figure 1 , including: poles 24, the poles 24 include positive poles 24 and negative poles 24, the positive poles 24 are electrically connected to the positive electrode sheet 21, and the negative poles 24 are electrically connected to the negative electrode sheet 22. Thus, the battery cell 1000 can realize the charging and discharging functions through the poles 24.

[0054] According to some embodiments of the present invention, referring to Figure 1A positive electrode ear is connected between the positive electrode column 24 and the positive electrode sheet 21 , and a negative electrode ear is connected between the negative electrode column 24 and the negative electrode sheet 22 . Thus, the electrode ear 25 can facilitate the connection between the electrode column 24 and the electrode sheet.

[0055] According to some embodiments of the present invention, referring to Figure 1 , including: an insulating film 60, the insulating film 60 is coated on the outside of the electrode group 20, which can effectively prevent the electrode group 20 from contacting with the shell 10 to form a short circuit, thereby ensuring that the battery cell 1000 can work normally.

[0056] According to the battery pack of the second embodiment of the utility model, refer to Figure 1 , including the battery cell 1000 of the first aspect of this embodiment.

[0057] According to the battery pack of the embodiment of the utility model, by setting the battery cell 1000 of the first embodiment mentioned above, a connecting edge is set on the support plate, and the support plate cooperates with the cover plate assembly 40 through the connecting edge to form a stable structure, thereby preventing the electrode group 20 from being damaged due to vibration, and further increasing the service life of the battery cell 1000.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0062] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: A housing, wherein a receiving cavity is formed inside the housing, and an opening communicating with the receiving cavity is formed on the top of the housing; A pole group, the pole group is arranged in the accommodating cavity, and the pole group includes pole pieces; A support member, the support member comprising: a support body and a connecting plate, the support body is arranged in the pole group, and the pole piece is wound on the outside of the support body to form a winding structure; A cover plate assembly is arranged at the position of the open opening and connected to the connecting plate.

2. The battery cell according to claim 1, characterized in that: The supporting body is formed as a plate body, and the connecting plate is connected to one side of the supporting body and is arranged beyond the edge of the supporting body.

3. The battery cell according to claim 1, characterized in that: The cover plate assembly includes a lower plastic, and the connecting plate is connected to the lower plastic.

4. The battery cell according to claim 1, characterized in that: The length of the connecting plate is not greater than the length of the supporting body.

5. The battery cell according to claim 1, characterized in that: The thickness of the support member is in the range of 100um-500um.

6. The battery cell according to claim 1, characterized in that: A plurality of grooves are formed on at least one side surface of the support member, the plurality of grooves are arranged in the length direction of the support member, and each of the grooves extends along the width direction of the support member.

7. The battery cell according to claim 6, characterized in that: The depth of the groove is no greater than 1 μm.

8. The battery cell according to claim 1, characterized in that: The electrode group includes: a positive electrode sheet, a negative electrode sheet and a separator, wherein the separator is arranged between the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet, the negative electrode sheet and the separator are stacked and then wound.

9. The battery cell according to claim 1, characterized in that: A through hole is formed on the cover plate assembly, and the battery cell further includes an explosion-proof valve, which is arranged at the position of the through hole.

10. A battery pack, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 9.

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