Soft package battery and electric equipment thereof

Abstract

The utility model relates to the technical field of batteries, and discloses a soft package battery and electric equipment thereof, the soft package battery has a first direction and a second direction which are intersected, the soft package battery comprises a shell, the shell is provided with a top sealing area, an inner unsealed area and a main body part which are sequentially connected along the first direction, the main body part is provided with a cavity, a battery cell is connected in the cavity, and the battery cell is connected with a tab. The tab penetrates through the inner unsealed area and extends out of the top sealed area, the tab is in sealed connection with the shell in the top sealed area, the inner unsealed area protrudes outwards in the second direction relative to the top sealed area to form an exhaust step, an exhaust channel is formed in the inner side of the exhaust step, and the exhaust channel is communicated with the cavity. According to the soft package battery and the electric equipment thereof disclosed by the utility model, the exhaust space in the soft package battery is enlarged, and gas generated in the battery is prevented from breaking through the seal of the top seal area.

Description

Technical Field

[0001] This utility model relates to the technical field of batteries, and in particular to a soft-pack battery and its electrical equipment. Background Technology

[0002] Currently, in order to improve the energy density of pouch batteries, the gaps around the inner pit of the bare pouch battery and the formed aluminum-plastic film are becoming smaller and smaller in size design. In addition, the safety design requires the separator width to be larger, resulting in severe separator accumulation at the head and tail of the inner pit. The small gaps around the inner pit further reduce the venting space inside the pouch battery. Figure 1 As shown, the existing unsealed inner area forms an arc-shaped edge by free stretching during the punching process. However, due to the small internal venting space formed by the unsealed inner area at the arc edge, the venting space is insufficient, which can easily lead to excessive internal pressure and the risk of the top seal being broken open. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. It provides a pouch battery and its electrical device, increasing the venting space within the pouch battery to prevent gas generated inside the battery from breaking through the seal of the top sealing area.

[0004] To achieve the above objectives, this utility model provides a soft-pack battery having intersecting first and second directions, including a housing. The housing has a top-sealed area, an inner unsealed area, and a main body connected sequentially along the first direction. The main body has a cavity, and a battery cell is connected inside the cavity. The battery cell is connected to a tab, which passes through the inner unsealed area and extends out of the top-sealed area. The tab is sealed to the housing in the top-sealed area. The inner unsealed area protrudes outward relative to the top-sealed area in the second direction to form an exhaust step. An exhaust channel is formed on the inner side of the exhaust step, and the exhaust channel communicates with the cavity.

[0005] As a preferred embodiment, the housing includes a first aluminum-plastic film and a second aluminum-plastic film, one end of the first aluminum-plastic film is connected to one end of the second aluminum-plastic film, the other end of the first aluminum-plastic film is bonded and sealed to the other end of the second aluminum-plastic film to form the top sealing area, the exhaust step is disposed on the second aluminum-plastic film, and the cavity is located between the first aluminum-plastic film and the second aluminum-plastic film.

[0006] As a preferred embodiment, the second aluminum-plastic film further includes a top sealing section and a main body section. The top sealing section, the exhaust step, and the main body section are connected in sequence. The top sealing section is sealed to one end of the first aluminum-plastic film. The exhaust step protrudes outward from the top sealing section in a second direction. One end of the main body section is connected to the end of the exhaust step away from the top sealing section. The other end of the main body section is connected to the end of the first aluminum-plastic film away from the top sealing area, and the cavity is formed between the main body section and the first aluminum-plastic film.

[0007] As a preferred embodiment, the exhaust step includes a first side section and a second side section. One end of the first side section is connected to the top sealing section, and the other end extends away from the first aluminum-plastic film and is connected to one end of the second side section. The other end of the second side section is connected to the main body section.

[0008] As a preferred embodiment, the exhaust step further includes a first semi-rounded corner, a second semi-rounded corner, and a third semi-rounded corner. The openings of the first semi-rounded corner and the third semi-rounded corner face the outer side of the housing, and the opening of the second semi-rounded corner faces the inner side of the housing. One end of the first semi-rounded corner is connected to the top sealing section, and the other end is connected to the first side section. One end of the second semi-rounded corner is connected to the first side section, and the other end is connected to the second side section. One end of the third semi-rounded corner is connected to the second side section, and the other end is connected to the main body section.

[0009] As a preferred embodiment, the battery cell has a separator and an electrode, the separator and the electrode are located in the cavity, and one end of the separator protrudes from the electrode and extends into the exhaust channel.

[0010] As a preferred embodiment, the depth of the exhaust step is H1, and the maximum thickness of the housing is H2, satisfying that H1 < H2, wherein the depth of the exhaust step is the dimension of the exhaust step in the second direction, and the thickness of the housing is the dimension of the housing in the second direction.

[0011] As a preferred embodiment, H2 ≥ 3 mm, 1 mm ≤ H1 ≤ 2 mm.

[0012] As a preferred embodiment, the thickness of both the first aluminum-plastic film and the second aluminum-plastic film is set to 88um to 115um.

[0013] An electrical device, comprising a pouch battery.

[0014] Compared with the prior art, the present invention discloses a soft-pack battery and its electrical device, the advantages of which are as follows: The soft-pack battery includes a casing, which has a top-sealed area, an inner unsealed area, and a main body connected in sequence. The main body has a cavity containing a battery cell and an electrolyte. The battery cell is connected to a tab, which extends through the inner unsealed area to the top-sealed area and protrudes from the top-sealed area. The tab is sealed to the casing at the top-sealed area to fix the tab and ensure the airtightness and safety of the casing. The inner unsealed area is located between the top-sealed area and the cavity. The end of the inner unsealed area facing the top-sealed area protrudes outward to form a venting step, which expands the space outward at the end of the inner unsealed area facing the top-sealed area. A venting channel is formed inside the venting step and communicates with the cavity. This increases the venting space at the end of the cavity facing the top-sealed area, allowing more gas to be contained in the inner unsealed area, preventing gas generated inside the casing from breaking through the seal of the top-sealed area. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the existing technology.

[0016] Figure 2 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0017] Figure 3 This is an embodiment of the present utility model. Figure 2 A cross-sectional view of EE in the diagram.

[0018] Figure 4 This is another embodiment of the present utility model. Figure 2 A cross-sectional view of EE in the diagram.

[0019] Figure 5 This is an embodiment of the present utility model. Figure 3 Enlarged structural diagram at point D in the diagram.

[0020] Figure 6 This is a schematic diagram of the structure of the shell in an embodiment of this utility model.

[0021] In the picture:

[0022] 10. Shell; 11. Top sealing area; 12. Unsealed inner area; 13. Main body; 14. Cavity; 15. Exhaust passage;

[0023] 20. Battery cell; 21. Separator; 22. Electrode; 23. Positive electrode; 24. Negative electrode;

[0024] 30. First aluminum-plastic film;

[0025] 40. Second aluminum-plastic film; 41. Top sealing section; 42. Main body section; 43. Exhaust step; 44. First side section; 45. Second side section; 46. First semi-rounded corner; 47. Second semi-rounded corner; 48. Third semi-rounded corner;

[0026] Y, the first direction; X, the second direction. Detailed Implementation

[0027] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0028] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In the description of this utility model, it should be understood that the terms "connected," "linked," and "fixed," etc., used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] like Figures 2 to 6 As shown, a preferred embodiment of the present invention provides a soft-pack battery having intersecting first direction Y and second direction X. It includes a housing 10, with a top-sealed area 11, an inner unsealed area 12, and a main body 13 sequentially connected along the first direction Y. The main body 13 has a cavity 14, within which a battery cell 20 is connected. The battery cell 20 is connected to a tab, which passes through the inner unsealed area 12 and extends out of the top-sealed area 11. The tab is sealed to the housing 10 at the top-sealed area 11. The inner unsealed area 12 protrudes outward relative to the top-sealed area 11 in the second direction X to form an exhaust step 43. An exhaust channel 15 is formed inside the exhaust step 43, and the exhaust channel 15 communicates with the cavity 14.

[0031] This utility model also provides an electrical device, including the aforementioned soft-pack battery.

[0032] The present invention relates to a soft-pack battery and its electrical device. The soft-pack battery includes a housing 10. The housing 10 has a top-sealed area 11, an inner unsealed area 12 and a main body 13 connected in sequence. The main body 13 has a cavity 14, which contains a battery cell 20 and an electrolyte. The battery cell 20 is connected to a tab. The tab extends through the inner unsealed area 12 to the top-sealed area 11 and protrudes from the top-sealed area 11. The tab is sealed to the housing 10 at the top-sealed area 11 to fix the tab and ensure the airtightness and safety of the housing 10. The unsealed inner area 12 is located between the top sealing area 11 and the cavity 14. The end of the unsealed inner area 12 facing the top sealing area 11 protrudes outward to form an exhaust step 43, which expands the space of the unsealed inner area 12 facing the top sealing area 11. An exhaust channel 15 is formed inside the exhaust step 43 and is connected to the cavity 14. This increases the exhaust space at the end of the cavity 14 facing the top sealing area 11, allowing more gas to be contained in the unsealed inner area 12, thus preventing gas generated inside the shell 10 from breaking through the seal of the top sealing area 11.

[0033] Among them, the top sealing area 11 is the sealed area located at the top of the battery during battery encapsulation. For example... Figures 2 to 4 As shown, the area between line A and line B is the top sealing area 11. In the manufacturing process of a pouch battery, the main purpose of the top sealing is to seal the tab portion of the cell 20, ensuring the airtightness and safety of the cell 20. (As shown...) Figures 2 to 4 As shown, the area on the shell 10 between line B and line C is the inner unsealed area 12. The inner unsealed area 12 is located between the top sealing area 11 and the main body 13. In the existing inner unsealed area 12, during the punching process, as... Figure 1 As shown, the inner unsealed area 12 forms an arc-shaped edge through free stretching. However, due to the small internal venting space formed by the inner unsealed area 12 within the arc-shaped edge, the venting space is insufficient, which can easily lead to excessive internal pressure and the risk of the top seal being breached. Figure 2 As shown, this utility model increases the space of the exhaust channel 15 formed inside the unsealed area 12 by forming an exhaust step 43 protruding outward from the inner unsealed area 12, so as to accommodate more gas.

[0034] As one embodiment, such as Figures 3 to 4 As shown, the cell 20 of the pouch battery is formed by combining a positive electrode 23, a negative electrode 24, and a separator 21 through a winding process. The cell 20 is encased in a flexible aluminum-plastic composite casing 10, forming the core part of the pouch battery.

[0035] Furthermore, such as Figures 3 to 4As shown, the housing 10 includes a first aluminum-plastic film 30 and a second aluminum-plastic film 40. One end of the first aluminum-plastic film 30 is connected to one end of the second aluminum-plastic film 40, and the other end of the first aluminum-plastic film 30 is bonded and sealed to the other end of the second aluminum-plastic film 40 to form a top sealing area 11. An exhaust step 43 is disposed on the second aluminum-plastic film 40, and the cavity 14 is located between the first aluminum-plastic film 30 and the second aluminum-plastic film 40. The housing 10 is formed by connecting a first aluminum-plastic film 30 and a second aluminum-plastic film 40. The first aluminum-plastic film 30 and the second aluminum-plastic film 40 can be formed by connecting two independent aluminum-plastic films, or by folding a single aluminum-plastic film in half to form the first aluminum-plastic film 30 and the second aluminum-plastic film 40, which are positioned opposite each other and connected at one end. An opening is formed between the other ends of the first aluminum-plastic film 30 and the second aluminum-plastic film 40, through which the electrode tab extends. This opening is heat-sealed to form a top sealing area 11, thereby fixing the electrode tab and sealing the housing 10. A cavity 14 is formed between the first aluminum-plastic film 30 and the second aluminum-plastic film 40, within which the battery cell 20 and the electrolyte are located, ensuring the airtightness and safety of the battery cell 20. The venting step 43 can be formed simply by punching a pit in the second aluminum-plastic film 40, simplifying the manufacturing process.

[0036] In one embodiment, the opposing surfaces of the first aluminum-plastic film 30 and the second aluminum-plastic film 40 are respectively provided with a polypropylene layer, and the first aluminum-plastic film 30 and the second aluminum-plastic film 40 are heat-sealed through the polypropylene layer.

[0037] Furthermore, such as Figure 5As shown, the second aluminum-plastic film 40 also includes a top sealing section 41 and a main body section 42. The top sealing section 41, the exhaust step 43, and the main body section 42 are connected in sequence. The top sealing section 41 is sealed to one end of the first aluminum-plastic film 30. The exhaust step 43 protrudes outward from the top sealing section 41 along the second direction X. One end of the main body section 42 is connected to the end of the exhaust step 43 away from the top sealing section 41, and the other end of the main body section 42 is connected to the end of the first aluminum-plastic film 30 away from the top sealing area 11, forming a cavity 14 between the main body section 42 and the first aluminum-plastic film 30. The second aluminum-plastic film 40 includes the top sealing section 41, the exhaust step 43, and the main body section 42 connected in sequence. By segmenting the second aluminum-plastic film 40, the second aluminum-plastic film 40 is connected to the first aluminum-plastic film 30 respectively, and is clearly distinguished into the top sealing area 11, the inner unsealed area 12, and the main body 13, resulting in a compact overall structure. The top sealing section 41 is sealed to the first aluminum-plastic film 30 to ensure the airtightness and safety of the battery cell 20. The exhaust step 43 protrudes outward relative to the top sealing section 41, thereby moving the second aluminum-plastic film 40 away from the first aluminum-plastic film 30 at the exhaust step 43. The exhaust step 43 increases the distance between the first aluminum-plastic film 30 and the second aluminum-plastic film 40. When the exhaust step 43 is affected by the heat radiation of the end cap, the first aluminum-plastic film 30 and the second aluminum-plastic film 40 do not stick together, avoiding the first aluminum-plastic film 30 and the second aluminum-plastic film 40 from sticking together and occupying the space of the exhaust channel 15 during heat sealing.

[0038] Furthermore, such as Figure 5 As shown, the exhaust step 43 includes a first side section 44 and a second side section 45. One end of the first side section 44 is connected to the top sealing section 41, and the other end extends away from the first aluminum-plastic film 30 and connects to one end of the second side section 45. The other end of the second side section 45 is connected to the main body section 42. By extending the first side section 44 away from the first aluminum-plastic film 30, the exhaust step 43 protrudes relative to the first aluminum-plastic film 30, and the exhaust step 43 of the second aluminum-plastic film 40 is completely away from the first aluminum-plastic film 30, thereby increasing the space of the exhaust channel 15. At the same time, during the heat sealing of the top sealing area 11, it prevents the first aluminum-plastic film 30 and the second aluminum-plastic film 40 in the unsealed inner area 12 from sticking together and occupying the space of the exhaust channel 15, thus reducing the smoothness of gas flow.

[0039] Furthermore, such as Figure 5As shown, the exhaust step 43 also includes a first semi-rounded corner 46, a second semi-rounded corner 47, and a third semi-rounded corner 48. The openings of the first semi-rounded corner 46 and the third semi-rounded corner 48 face the outer side of the housing 10, and the opening of the second semi-rounded corner 47 faces the inner side of the housing 10. One end of the first semi-rounded corner 46 is connected to the top sealing section 41, and the other end is connected to the first side section 44. One end of the second semi-rounded corner 47 is connected to the first side section 44, and the other end is connected to the second side section 45. One end of the third semi-rounded corner 48 is connected to the second side section 45, and the other end is connected to the main body section 42. The punching mold has rounded corners, and the positions of the rounded corners correspond to the positions of the first semi-rounded corner 46, the second semi-rounded corner 47, and the third semi-rounded corner 48, respectively, to prevent the housing 10 from scratching the second aluminum-plastic film 40 during punching.

[0040] As one embodiment, such as Figure 5 As shown, the exhaust step 43 has a first direction Y and a second direction X that are perpendicular to each other. The first side section 44 extends along the second direction X, and the second side section 45 extends along the first direction Y, so that the exhaust step 43 formed by the first side section 44 and the second side section 45 has a regular shape, which is simple to process. At the same time, it makes the inner pit exhaust space formed by the exhaust step 43 larger, providing a larger exhaust space for the battery cell 20.

[0041] In one embodiment, multiple exhaust steps 43 are provided, which extend along the second direction X and are connected in sequence. The multiple exhaust steps 43 make the unsealed inner area 12 protrude outward more, increase the space of the exhaust channel 15, and improve the smoothness of gas flow in the battery cell 20.

[0042] Furthermore, such as Figure 3 As shown, the battery cell 20 has a separator 21 and an electrode 22. The separator 21 and the electrode 22 are located within the cavity 14. One end of the separator 21 protrudes beyond the electrode 22 and extends into the venting channel 15. Generally, the wider the separator 21, the better the battery's safety performance. The separator 21 extends beyond the electrode 22 in width to improve battery safety. The electrode 22 is located within the cavity 14, and the portion of the separator 21 extending beyond the anode electrode 22 into the venting channel 15 provides space for the separator 21. The outwardly protruding venting step 43 reduces the degree of separator 21 accumulation within the venting channel 15, improving the smoothness of gas flow within the battery cell 20. Simultaneously, the large number of separators 21 located within the venting channel 15 provides some support for the venting step 43.

[0043] In another embodiment, such as Figure 4 As shown, the diaphragm 21 does not extend into the exhaust channel 15, thus not occupying the space of the exhaust channel 15 and improving the smoothness of gas flow.

[0044] Furthermore, such as Figure 5As shown, the depth of the exhaust step 43 is H1, and the maximum thickness of the housing 10 is H2, satisfying that H1 < H2. Here, the depth of the exhaust step 43 is its dimension in the second direction X, and the thickness of the housing 10 is its dimension in the second direction X. The depth of the exhaust step 43 is less than the maximum thickness of the housing 10, avoiding affecting the overall thickness of the housing 10, and thus providing a larger exhaust space for the battery cell 20 without affecting the thickness of the housing 10.

[0045] Furthermore, such as Figure 5 As shown, H2 ≥ 3mm, 1mm ≤ H1 ≤ 2mm. The depth of the exhaust step 43 is set within a suitable range to ensure that the exhaust step 43 can be formed by punching a hole without affecting the overall thickness of the housing 10, while providing a larger exhaust space for the battery cell 20.

[0046] As one embodiment, such as Figure 6 As shown, the width of the unsealed inner area 12 is W, where W = 0.4mm-1mm. Maintaining the same width range for the unsealed inner area 12 as the existing structure does not affect the side width of the top sealing area 11 or the overall length of the housing 10, thus meeting the exhaust space requirements while avoiding additional improvement costs.

[0047] Furthermore, such as Figures 3 to 4 As shown, the thickness of both the first aluminum-plastic film 30 and the second aluminum-plastic film 40 is set to 88µm to 115µm. Setting the thickness of the first aluminum-plastic film 30 and the second aluminum-plastic film 40 within a preset range can maintain sufficient mechanical strength to resist external impacts and punctures, thereby improving battery safety.

[0048] In summary, this utility model provides a soft-pack battery and its electrical device. The soft-pack battery includes a housing 10. The housing 10 has a top-sealed area 11, an inner unsealed area 12, and a main body 13 connected in sequence. The main body 13 has a cavity 14, which contains a battery cell 20 and an electrolyte. The battery cell 20 is connected to a tab. The tab extends through the inner unsealed area 12 to the top-sealed area 11 and protrudes from the top-sealed area 11. The tab is sealed to the housing 10 at the top-sealed area 11 to fix the tab and ensure the airtightness and safety of the housing 10. The unsealed inner area 12 is located between the top sealing area 11 and the cavity 14. The end of the unsealed inner area 12 facing the top sealing area 11 protrudes outward to form an exhaust step 43, which expands the space of the end of the unsealed inner area 12 facing the top sealing area 11. An exhaust channel 15 is formed inside the exhaust step 43 and is connected to the cavity 14. The exhaust space is increased at the end of the cavity 14 facing the top sealing area 11. The exhaust channel 15 in the unsealed inner area 12 can accommodate more gas, preventing the gas generated in the shell 10 from breaking through the seal of the top sealing area 11.

[0049] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A soft-pack battery, characterized in that: The device includes a housing with intersecting first and second directions. The housing has a top-sealed area, an inner unsealed area, and a main body connected sequentially along the first direction. The main body has a cavity, and a battery cell is connected inside the cavity. The battery cell is connected to an electrode tab, which passes through the inner unsealed area and extends out of the top-sealed area. The electrode tab is sealed to the housing in the top-sealed area. The inner unsealed area protrudes outward relative to the top-sealed area in the second direction to form an exhaust step. An exhaust channel is formed on the inner side of the exhaust step, and the exhaust channel communicates with the cavity.

2. The soft-pack battery according to claim 1, characterized in that: The housing includes a first aluminum-plastic film and a second aluminum-plastic film. One end of the first aluminum-plastic film is connected to one end of the second aluminum-plastic film. The other end of the first aluminum-plastic film is bonded and sealed to the other end of the second aluminum-plastic film to form the top sealing area. The exhaust step is disposed on the second aluminum-plastic film. The cavity is located between the first aluminum-plastic film and the second aluminum-plastic film.

3. The soft-pack battery according to claim 2, characterized in that: The second aluminum-plastic film further includes a top sealing section and a main body section. The top sealing section, the exhaust step, and the main body section are connected in sequence. The top sealing section is fitted and sealed to one end of the first aluminum-plastic film. The exhaust step protrudes outward from the top sealing section in a second direction. One end of the main body section is connected to the end of the exhaust step away from the top sealing section. The other end of the main body section is connected to the end of the first aluminum-plastic film away from the top sealing area, and the cavity is formed between the main body section and the first aluminum-plastic film.

4. The soft-pack battery according to claim 3, characterized in that: The exhaust step includes a first side section and a second side section. One end of the first side section is connected to the top sealing section, and the other end extends away from the first aluminum-plastic film and is connected to one end of the second side section. The other end of the second side section is connected to the main body section.

5. The soft-pack battery according to claim 4, characterized in that: The exhaust step further includes a first semi-rounded corner, a second semi-rounded corner, and a third semi-rounded corner. The openings of the first semi-rounded corner and the third semi-rounded corner face the outside of the housing, and the opening of the second semi-rounded corner faces the inside of the housing. One end of the first semi-rounded corner is connected to the top sealing section, and the other end is connected to the first side section. One end of the second semi-rounded corner is connected to the first side section, and the other end is connected to the second side section. One end of the third semi-rounded corner is connected to the second side section, and the other end is connected to the main body section.

6. The soft-pack battery according to claim 1, characterized in that: The battery cell has a diaphragm and an electrode, the diaphragm and the electrode are located in the cavity, one end of the diaphragm protrudes from the electrode and extends into the exhaust channel.

7. The soft-pack battery according to claim 1, characterized in that: The depth of the exhaust step is H1, and the maximum thickness of the housing is H2, satisfying that H1 < H2, wherein the depth of the exhaust step is the dimension of the exhaust step in the second direction, and the thickness of the housing is the dimension of the housing in the second direction.

8. The soft-pack battery according to claim 7, characterized in that: in, H2≥3mm, 1mm≤H1≤2mm.

9. The soft-pack battery according to claim 2, characterized in that: The thickness of both the first aluminum-plastic film and the second aluminum-plastic film is set to 88um to 115um.

10. An electrical appliance, characterized in that: Includes the pouch cell battery as described in any one of claims 1-9.

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