Battery cell and battery pack

Abstract

The utility model discloses a battery monomer and a battery pack. The battery monomer comprises a shell, a battery pack and a battery pack, a pole group, wherein the pole group is arranged in the shell; the explosion-proof valve is arranged on the shell body; the explosion-proof valve comprises a pole group and an insulation assembly, the insulation assembly wraps the pole group, an exhaust hole is formed in the insulation assembly, and the ratio of the area of the exhaust hole to the exhaust area of the explosion-proof valve is not smaller than 0.5. According to the battery monomer disclosed by the utility model, the exhaust hole is formed in the insulating component, so that gas in the battery cell is quickly gathered at the explosion-proof valve, high-temperature gas is prevented from being always positioned in the battery cell, the ratio of the area of the exhaust hole to the exhaust area of the explosion-proof valve is not less than 0.5, and the requirement of safe exhaust is met; the safety coefficient of the battery monomer is improved, the whole structure of the battery monomer is more reasonable, the production efficiency is improved, and the production and transportation cost is reduced.

Description

Technical Field

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

[0002] Relevant technologies point out that as lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing.

[0003] Lithium batteries are the core components of battery system safety and stability, and their performance stability is crucial to batteries. The current battery cells have poor internal protection of positive and negative electrode groups, copper and aluminum tabs, and particles, which are prone to internal overlap, short circuits, and other defects. The explosion-proof valve is a core component of battery cell safety. When a certain amount of gas is generated inside the battery cell, the valve will open instantly to protect the battery cell safety.

[0004] At present, the insulating films of bare battery cells are all made of insulating materials with equal wall thickness (which play the role of insulation and isolation of the electrode group, and prevent internal short circuit defects in the battery cell); the same material cannot meet the performance requirements of different battery cells. The battery cell electrode group needs to be insulated, and at the same time, it should not affect the exhaust channel of the battery cell as much as possible; the two are currently incompatible. Some performance of the current design will be abandoned. If a hole is opened in the bare battery cell insulating film corresponding to the explosion-proof valve, it will be beneficial for the rapid discharge of gas. However, there is a risk of powder falling off the electrode group and the electrode group contacting the explosion-proof valve, which may cause corrosion and damage to the explosion-proof valve or cause an internal short circuit in the battery cell. Utility Model Content

[0005] 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 with a simple structure and a high safety factor.

[0006] The utility model also provides a battery pack having the battery monomer.

[0007] According to the first aspect of the utility model, the battery cell comprises: a shell; a pole group, the pole group is arranged in the shell; an explosion-proof valve, the explosion-proof valve is arranged in the shell; an insulating component, the insulating component covers the pole group, and an exhaust hole is formed on the insulating component, and the ratio between the area of ​​the exhaust hole and the exhaust area of ​​the explosion-proof valve is not less than 0.5.

[0008] According to the battery cell of the utility model, by opening the exhaust hole on the insulating component, the gas inside the battery cell is quickly gathered at the explosion-proof valve, which avoids the high-temperature gas always being inside the battery cell. The ratio between the area of ​​the exhaust hole and the exhaust area of ​​the explosion-proof valve is not less than 0.5, which meets the demand for safe exhaust, improves the safety factor of the battery cell, makes the overall structure of the battery cell more reasonable, improves production efficiency, and reduces production and transportation costs.

[0009] In some embodiments, the insulating component includes: an insulating film, which covers the pole group in the circumferential direction of the pole group; and an insulating sheet, which is disposed at the position of the exhaust hole and covers the exhaust hole.

[0010] In some embodiments, a plurality of through holes arranged at intervals are formed on the insulating sheet, and the plurality of through holes penetrate the insulating sheet in a thickness direction of the insulating sheet.

[0011] In some embodiments, the ratio of the area of ​​the insulating sheet to the exhaust area of ​​the explosion-proof valve is not less than 1.2.

[0012] In some embodiments, a pole is disposed on the shell, and the pole and the explosion-proof valve are arranged on different sides of the shell.

[0013] In some embodiments, the explosion-proof valve is arranged on at least one side in the width direction of the shell, and the exhaust hole is formed on the insulating film and is arranged corresponding to the explosion-proof valve.

[0014] In some embodiments, the distance between the edge of the insulating sheet and the edge of the insulating film is not less than 0.5 mm.

[0015] In some embodiments, the insulating sheet and the insulating film are integrally formed.

[0016] In some embodiments, the shell further includes: a cover plate assembly, which is disposed at the end of the pole group and connected to the pole; a side plate, which is disposed between the insulating assembly and the shell; and a patch, which is disposed on the side of the cover plate assembly away from the pole group.

[0017] A battery pack according to a second aspect of the present invention comprises a plurality of battery cells according to the first aspect of the present invention.

[0018] According to the battery pack of the utility model, by providing a plurality of battery cells of the first aspect, the overall performance of the battery pack is improved, the safety of the battery pack is ensured, the risk factor of the battery pack is reduced, the overall structure of the battery pack is more reasonable, the production efficiency and production quality are improved, and the production and transportation costs are reduced.

[0019] 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

[0020] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the utility model;

[0021] Figure 2yes Figure 1 A schematic diagram of a top view of a battery cell shown in ;

[0022] Figure 3 yes Figure 2 A partial enlarged schematic diagram of a battery cell shown in ;

[0023] Figure 4 yes Figure 1 A schematic diagram of the insulation assembly shown in ;

[0024] Figure 5 yes Figure 4 Schematic diagram of the insulating film shown in;

[0025] Figure 6 yes Figure 5 A schematic diagram of a top view of the insulating film shown in ;

[0026] Figure 7 yes Figure 4 A schematic diagram of a side view of the insulation assembly shown in ;

[0027] Figure 8 yes Figure 4 A schematic cross-sectional view of the insulation assembly shown in FIG.

[0028] Reference numerals:

[0029] 100. Battery cell;

[0030] 1. Shell;

[0031] 2. Pole group; 21. Pole column;

[0032] 3. Explosion-proof valve;

[0033] 4. Insulation assembly; 41. Insulation film; 411. Exhaust hole; 42. Insulation sheet;

[0034] 5. Cover plate assembly;

[0035] 6. Side panels;

[0036] 7. Patch. DETAILED DESCRIPTION

[0037] 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.

[0038] Reference below Figure 1-Figure 8 A battery cell 100 according to an embodiment of the first aspect of the present invention is described.

[0039] like Figure 1 As shown, the battery cell 100 according to the embodiment of the first aspect of the utility model includes: a shell 1, a pole group 2, an explosion-proof valve 3 and an insulating component 4.

[0040] Specifically, the electrode group 2 is disposed in the housing 1, the explosion-proof valve 3 is disposed in the housing 1, the insulation component 4 covers the electrode group 2, and the insulation component 4 is formed with an exhaust hole 411, and the ratio between the area of ​​the exhaust hole 411 and the exhaust area of ​​the explosion-proof valve 3 is not less than 0.5. In other words, the exhaust area of ​​the explosion-proof valve 3 is less than or equal to twice the area of ​​the exhaust hole 411. As a result, the battery cell 100 has a simple structure and a good exhaust effect.

[0041] According to the battery cell 100 of the embodiment of the utility model, by opening the exhaust hole 411 on the insulating component 4, the gas inside the battery cell is quickly gathered at the explosion-proof valve 3, which avoids the high-temperature gas always being inside the battery cell. The ratio between the area of ​​the exhaust hole 411 and the exhaust area of ​​the explosion-proof valve 3 is not less than 0.5, which meets the demand for safe exhaust, improves the safety factor of the battery cell 100, makes the overall structure of the battery cell 100 more reasonable, improves production efficiency, and reduces production and transportation costs.

[0042] In some embodiments of the present invention, Figure 4 As shown, the insulating assembly 4 includes: an insulating film 41 and an insulating sheet 42, wherein the insulating film 41 covers the electrode group 2 in the circumferential direction of the electrode group 2, and the insulating sheet 42 is arranged at the position of the exhaust hole 411 and covers the exhaust hole 411. Thus, the overall safety performance of the battery cell 100 is improved, and foreign matter is prevented from entering the exhaust hole 411, thereby preventing foreign matter from clogging the exhaust hole 411.

[0043] In some embodiments of the utility model, a plurality of through holes 421 arranged at intervals are formed on the insulating sheet 42, and the plurality of through holes 421 penetrate the insulating sheet 42 in the thickness direction of the insulating sheet 42. Thus, while ensuring the air passage, the risk of powder and material falling off the electrode group 2, squeezing the explosion-proof valve 3, and corrosion short circuit is reduced, and the gas can pass through the through holes 421, and the debris cannot pass through, thereby improving the safety factor of the battery cell 100.

[0044] In some embodiments of the present invention, the ratio between the area of ​​the insulating sheet 42 and the exhaust area of ​​the explosion-proof valve 3 is not less than 1.2. In other words, the area of ​​the insulating sheet 42 is greater than or equal to 1.2 times the exhaust area of ​​the explosion-proof valve 3. Thus, it is prevented that debris falls into the battery cell from the gap between the insulating sheet 42 and the insulating film 41, ensuring that debris cannot pass through.

[0045] In some embodiments of the present invention, a pole 21 is provided on the housing 1, and the pole 21 and the explosion-proof valve 3 are arranged on different sides of the housing 1. Figure 1As shown, the explosion-proof valve 3 is arranged on the upper side of the housing 1, and the pole 21 is arranged on the right side of the housing 1. In this way, the safety of the battery cell 100 during use is guaranteed, and the arrangement on different sides makes the arrangement structure reasonable, reduces the waste of space, and can also prevent the exhausted gas from damaging the pole 21, thereby protecting the pole 21.

[0046] In some embodiments of the present invention, Figure 1 As shown, the explosion-proof valve 3 is arranged on at least one side of the housing 1 in the width direction, and the exhaust hole 411 is formed on the insulating film 41 and is arranged corresponding to the explosion-proof valve 3. Thus, it is convenient to discharge the high-temperature gas from the battery cell 100, and it is convenient to assemble and use.

[0047] In some embodiments of the present invention, the distance M between the edge of the insulating sheet 42 and the edge of the insulating film 41 is not less than 0.5 mm. For example, the distance M between the edge of the insulating sheet 42 and the edge of the insulating film 41 can be 0.5 mm, 0.52 mm, 0.54 mm, 0.56 mm, 0.58 mm, 0.6 mm, 0.62 mm, 0.64 mm, 0.66 mm, 0.68 mm, 0.7 mm, etc.

[0048] In some embodiments of the present invention, the insulating sheet 42 and the insulating film 41 are integrally formed, so that the assembly is convenient, the automatic production is applicable, the production efficiency is high, and the production is stable and reliable.

[0049] In some embodiments of the present invention, Figure 1 As shown, the housing 1 further includes: a cover plate assembly 5, a side plate 6 and a patch 7. The cover plate assembly 5 is arranged at the end of the electrode group 2 and connected to the pole 21. The side plate 6 is arranged between the insulating assembly 4 and the housing 1. The patch 7 is arranged on the side of the cover plate assembly 5 away from the pole group 2. In this way, the pole 21 is protected and prevented from being damaged, the structural stability of the battery cell 100 is improved, and multiple battery cells 100 are easy to assemble.

[0050] The battery pack according to the second embodiment of the present invention includes a plurality of battery cells 100 according to the first embodiment of the present invention.

[0051] According to the battery pack of the embodiment of the utility model, by setting a plurality of battery cells 100 of the first embodiment, the overall performance of the battery pack is improved, the safety of the battery pack is ensured, the risk factor of the battery pack is reduced, the overall structure of the battery pack is more reasonable, the production efficiency and production quality are improved, and the production and transportation costs are reduced.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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, It is characterized in that include: case; A pole group, the pole group is arranged in the shell; An explosion-proof valve, the explosion-proof valve being arranged on the housing; An insulating component, wherein the insulating component covers the pole group, and an exhaust hole is formed on the insulating component, and the ratio between the area of ​​the exhaust hole and the exhaust area of ​​the explosion-proof valve is not less than 0.

5.

2. The battery cell according to claim 1, It is characterized in that The insulation assembly comprises: An insulating film, wherein the insulating film covers the pole group in a circumferential direction of the pole group; An insulating sheet is disposed at the position of the exhaust hole and covers the exhaust hole.

3. The battery cell according to claim 2, It is characterized in that A plurality of through holes arranged at intervals are formed on the insulating sheet, and the plurality of through holes penetrate the insulating sheet in a thickness direction of the insulating sheet.

4. The battery cell according to claim 3, It is characterized in that The ratio of the area of ​​the insulating sheet to the exhaust area of ​​the explosion-proof valve is not less than 1.

2.

5. The battery cell according to claim 4, It is characterized in that The shell is provided with a pole, and the pole and the explosion-proof valve are arranged on different sides of the shell.

6. The battery cell according to claim 5, It is characterized in that The explosion-proof valve is arranged on at least one side of the housing in a width direction, and the exhaust hole is formed on the insulating film and is arranged corresponding to the explosion-proof valve.

7. The battery cell according to claim 6, It is characterized in that The distance between the edge of the insulating sheet and the edge of the insulating film is not less than 0.5 mm.

8. The battery cell according to any one of claims 2 to 7, It is characterized in that The insulating sheet and the insulating film are integrally formed.

9. The battery cell according to any one of claims 5 to 7, It is characterized in that The housing further comprises: A cover plate assembly, the cover plate assembly is arranged at the end of the pole group and connected to the pole; A side plate, the side plate being arranged between the insulating assembly and the shell; A patch is arranged on a side of the cover plate assembly away from the pole group.

10. A battery pack, It is characterized in that The invention comprises a plurality of battery cells according to any one of claims 1 to 9.

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