Soft package battery and manufacturing method thereof

Abstract

The invention discloses a soft package battery and a manufacturing method thereof, and the soft package battery comprises a first shell which is provided with a first cavity for accommodating electrolyte; the second shell is provided with a second cavity for accommodating gas exhausted by the electrolyte; and the exhaust assembly is used for controlling whether the second chamber is communicated with the outside or not so as to enable the second chamber to be communicated with the outside when the gas pressure of the second chamber reaches a preset value. The soft package battery and the manufacturing method thereof have the beneficial effects that the influence caused by gas production can be relieved, and the produced gas can be released after the produced gas reaches a certain degree.

Description

Technical Field

[0001] The present application relates to the technical field of soft-pack batteries, and in particular to a soft-pack battery with an exhaust function and a method for manufacturing the same. Background Art

[0002] Soft-pack batteries usually refer to lithium batteries whose shell is encapsulated by aluminum-plastic composite film. Due to its advantages such as light weight, low mold cost and high safety, its market share is gradually expanding.

[0003] In related technologies, since soft-pack batteries are prone to gas production during use, which affects their cycle performance, in other related technologies, the impact of gas production on performance is reduced by expanding the internal capacity of the soft-pack batteries. However, as time accumulates, gas production will eventually affect the battery. Summary of the invention

[0004] In view of this, the present application provides a soft-pack battery and a method for manufacturing the same, aiming to solve the problem of gas production in the soft-pack battery, thereby affecting battery performance.

[0005] As a first aspect of the present application, a soft-pack battery is provided, comprising: a first shell, forming a first chamber for accommodating an electrolyte; a second shell, forming a second chamber for accommodating a gas exhausted by the electrolyte; and a venting assembly, for controlling whether the second chamber is connected to the outside so that the second chamber is connected to the outside when the gas pressure in the second chamber reaches a preset value.

[0006] Optionally, in some embodiments of the present application, the soft-pack battery further includes: a positive electrode and a negative electrode; wherein the positive electrode and the negative electrode extend from the first chamber to the second chamber and are at least partially exposed from the second shell.

[0007] Optionally, in some embodiments of the present application, the soft-pack battery further includes: a connector disposed between the first shell and the second shell; wherein the connector is formed with connecting channels respectively communicating with the first chamber and the second chamber.

[0008] Optionally, in some embodiments of the present application, the second shell is disposed between the positive electrode and the first shell.

[0009] Optionally, in some embodiments of the present application, the second shell is disposed between the negative electrode and the first shell.

[0010] Optionally, in some embodiments of the present application, the connecting channel is arranged on the side of the connecting body.

[0011] Optionally, in some embodiments of the present application, the exhaust assembly includes: a conduit having an inlet inserted into the second chamber; and a pipe sealing device for sealing the outlet of the conduit; wherein the pipe sealing device is installed at the outlet of the conduit.

[0012] Optionally, in some embodiments of the present application, the exhaust assembly further includes:

[0013] The sealant is used to form a seal between the conduit and the inner wall of the second shell.

[0014] Optionally, in some embodiments of the present application, the tube sealing device includes an explosion-proof membrane that can rupture under a preset pressure.

[0015] Optionally, in some embodiments of the present application, wherein both the first shell and the shell are soft-pack shells, the preset pressure has a value range of 0.2 standard atmospheric pressure to 0.1 standard atmospheric pressure.

[0016] As a second aspect of the present application, a method for manufacturing the above-mentioned soft-pack battery is also provided.

[0017] The beneficial effect of the present application is that it provides a soft-pack battery and a manufacturing method thereof that can mitigate the impact of gas generation and release the gas after the gas generation reaches a certain level. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of a soft-pack battery provided in an embodiment of the present application;

[0020] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0021] Figure 3 yes Figure 1 A side view of a pouch cell is shown;

[0022] Figure 4 yes Figure 3 Sectional view along BB;

[0023] Figure 5 yes Figure 1 A front view of the soft pack battery shown;

[0024] Figure 6 yes Figure 5 Sectional view along CC;

[0025] Figure 7 is a cross-sectional view of another soft-pack battery provided in an embodiment of the present application;

[0026] Figure 8 is a schematic structural diagram of an exhaust assembly provided in an embodiment of the present application;

[0027] Fig. 9 yes Figure 8 The exhaust assembly shown is a schematic structural diagram observed from another perspective;

[0028] Fig.10 yes Figure 8 A schematic cross-sectional view of an exhaust assembly is shown;

[0029] Fig.11 It is a structural schematic diagram of another soft-pack battery provided in an embodiment of the present application;

[0030] Fig.12 yes Fig.11 A schematic diagram of the structure of the exhaust assembly in the soft pack battery shown;

[0031] Fig.13 yes Fig.11 Schematic diagram of the cross-sectional structure of the exhaust assembly in the soft pack battery shown

[0032] Fig.14 It is a structural schematic diagram of another soft-pack battery combination provided in an embodiment of the present application;

[0033] Fig.15 is a schematic diagram of a three-dimensional structure of a battery pack provided in an embodiment of the present application;

[0034] Fig.16 yes Fig.15 A schematic diagram of the side structure of the battery pack shown;

[0035] Fig.17 yes Fig.16 A schematic cross-sectional view of a battery pack shown;

[0036] Fig.18 yes Fig.17 A partial enlarged view of the

[0037] Fig.19 yes Fig.15 The schematic diagram of the internal structure of the battery pack shown;

[0038] Fig. 20 yes Fig.19 The schematic diagram of the structure shown is a schematic diagram of the structure after removing a single soft-pack battery;

[0039] Fig.21 yes Fig.15 The schematic diagram of the structure of the pressure plate in the battery pack shown;

[0040] Fig. 22 yes Fig.15 A schematic diagram of the structure of the pressure-applying component in the battery pack is shown.

[0041] Reference numerals:

[0042] 100, soft pack battery; 110, first shell; 111, first chamber; 120, second shell; 121, second chamber; 131, positive electrode; 132, negative electrode; 140, connector; 141, connecting channel; 150, exhaust assembly; 160, conduit; 161, inlet; 162, outlet; 170, pipe sealing device; 171, explosion-proof membrane;

[0043] 200, soft-pack battery; 210, first shell; 220, second shell; 221, second chamber;

[0044] 300, soft pack battery; 350, exhaust assembly; 360, conduit; 361, inlet; 362, outlet; 371, explosion-proof membrane; 372, puncture needle;

[0045] 400, soft pack battery; 410, first shell; 420, second shell; 440, connector;

[0046] 10. Battery pack; 20. Soft-pack battery; 30. Pressure assembly; 301. Pressure plate; 3011. Guide hole; 302. Adjustment member; 303. Chamber; 304. One-way valve; 305. Air manifold; 306. Movable plate; 307. Force spring; 308. Guide column; 309. Force-equalizing spring; 312. Force patch; 313. Retaining ring; 314. Nut block. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0049] In this application, unless otherwise stated, directional words such as "upper" and "lower" generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device. In addition, in the description of this application, the term "including" means "including but not limited to". The terms first, second, third, etc. are used only as labels and do not impose numerical requirements or establish an order.

[0050] In this application, "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural.

[0051] In the present application, "at least one" means one or more, and "plurality" means two or more. "One or more", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple, respectively.

[0052] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0053] Reference Figures 1 to 10As shown, the soft-pack battery 100 of the present application includes, in addition to the positive electrode 131, the negative electrode 132, the separator, the insulating material, the tabs and the electrolyte that a battery generally should have, the soft-pack battery 100 of the present application also includes: a first shell 110, a second shell 120 and a gas exhaust assembly 150.

[0054] Among them, the first shell 110 forms a first chamber 111 for accommodating electrolyte; the second shell 120 forms a second chamber 121 for accommodating gas discharged from the electrolyte; the exhaust component 150 is used to control whether the second chamber 121 is connected to the outside so that the second chamber 121 is connected to the outside when the gas pressure in the second chamber 121 reaches a preset value.

[0055] With such a solution, when the gas production reaches a certain value, the gas can be released outward through the exhaust assembly 150 to reduce the effect of the gas production on the performance of the soft-pack battery 100, especially on the cycle performance.

[0056] In some embodiments of the present application, the first shell 110 and the second shell 120 can be two parts of the same shell, that is, the first shell 110 and the second shell 120 can be integrally formed and then form two relatively independent chambers by scribing or gluing. Of course, they can also be directly formed by two independent shells.

[0057] In some embodiments of the present application, the first shell 110 and the second shell 120 may both be soft-package shells, and may be made of materials such as aluminum-plastic composite film.

[0058] Reference Figures 1 to 6 As shown, in some embodiments of the present application, the positive electrode 131 and the negative electrode 132 extend from the first chamber 111 to the second chamber 121 and are at least partially exposed from the second shell 120 .

[0059] Refer to Figures 1 to 6 As shown, in some embodiments of the present application, the soft pack battery further includes: a connector 140. The connector 140 is disposed between the first shell 110 and the second shell 120; wherein the connector 140 is formed with a connecting channel 141 that is respectively connected to the first chamber 111 and the second chamber 121. In this way, the gas can flow from the first chamber 111 to the second chamber 121.

[0060] As a specific solution, a membrane layer can be provided in the connecting channel 141, and the membrane layer can be first broken at a pressure value less than a preset pressure, so as to ensure that when the gas production is small, the first chamber 111 and the second chamber 121 are not connected. This is conducive to ensuring the independence of the first chamber 111 and the second chamber 121 when the gas production is small.

[0061] Reference Figures 1 to 6 As shown, Figure 5 As for the orientation shown, the positive electrode 131 (or the negative electrode 132), the second shell 120, the connector 140, and the first shell 110 are arranged in order from top to bottom. That is, the second shell 120 is arranged between the positive electrode 131 and the first shell 110; the second shell 120 is arranged between the negative electrode 132 and the first shell 110. At this time, the gas is discharged to the top of the first shell 110. In order to avoid excessive communication between the first chamber 111 and the second chamber 121, as a specific solution, as shown in FIG. Figure 4 As shown, the connecting channel 141 is disposed on one side of the connecting body 140 .

[0062] As a specific solution, a 5A molecular sieve (not shown in the figure) can be set in the second chamber 121 to perform gas absorption.

[0063] As a specific solution, the first shell 110 or the second shell 120 may be provided with an interlayer space (not shown in the figure), and a phase change material may be arranged in the interlayer space. The interlayer space is isolated from the first chamber 111 and the second chamber 121. The phase change temperature of the phase change material is set in the temperature range where the gas production of the soft-pack battery 100 is the largest. At this time, the phase change material can alleviate gas production by absorbing heat through phase change. At the same time, due to the increase in volume caused by the phase change, additional pressure is generated to the first chamber 111 and the second chamber 121 to help discharge the gas out of the first chamber 111 and the second chamber 121.

[0064] Reference Figure 7 As shown, as an extended solution, Figure 7 As shown in the orientation, the first shell 210 and the second shell 220 can also be arranged side by side (left and right), so that the resistance during the discharge of gas can be reduced, thereby making it easier for the gas to flow into the second chamber 221.

[0065] Reference Figures 8 to 10 As shown, in some embodiments of the present application, the exhaust assembly 150 further includes: a conduit 160, a pipe sealing device 170, and a sealant, etc. The conduit 160 has an inlet 161 inserted into the second chamber 121; the pipe sealing device 170 is used to seal the outlet 162 of the conduit 160; and the pipe sealing device 170 is installed at the outlet 162 of the conduit 160.

[0066] Reference Figures 8 to 10 As shown, as a specific solution, the tube sealing device 170 includes an explosion-proof membrane 171 that can be broken under a preset pressure. The explosion-proof membrane 171 has a cross notch. When the pressure is large enough, the gas will break through the notch and break through the explosion-proof membrane 171 to achieve exhaust to the outside. As an optional solution, the first shell 110 and the shell are both soft-package shells; the preset pressure ranges from 0.2 standard atmospheric pressure to 0.1 standard atmospheric pressure.

[0067] Reference Fig.11 , Fig.12 and Fig.13 As shown, as another embodiment, in the battery 300 provided in this embodiment, for the exhaust assembly 150, the tube sealing device includes a puncture needle 372 and an explosion-proof membrane 371, and the puncture needle 372 and the explosion-proof membrane 371 are arranged in the conduit 360. When the pressure is large enough, the explosion-proof membrane 371 moves toward the puncture needle 372, thereby puncturing the explosion-proof membrane 371 to allow the gas to flow between the inlet 361 and the outlet 362, and the gas can be discharged to the outside.

[0068] Reference Fig.14 As shown, as another embodiment, in this embodiment, multiple soft-pack batteries 400 can have respective first shells 410, and then be connected to the same second shell 420 through respective connectors 440 and connecting channels. At this time, the second shell 320 can also be exhausted by the exhaust component, or it can be used only to collect exhaust without discharging it to the outside. At this time, a corresponding film layer can be set at each connecting channel for the first sealing.

[0069] The advantage of adopting such a solution is that centralized exhaust can be performed when the soft-pack batteries are assembled into a battery pack.

[0070] Reference Figures 15 to 22 As shown, as a second aspect of the present application, the present application further provides a battery pack 10. The battery pack 10 may include a plurality of independent soft-pack batteries 20 and a pressure-applying assembly 30.

[0071] The soft pack battery 20 may adopt the aforementioned solution, or may adopt a general soft pack battery 20 without the second shell 120. The pressure component 30 is used to apply pressure to the first shell 110 so that the gas in the first chamber 111 is discharged through the exhaust component 150. As an extended solution, the pressure component 30 may also apply pressure to the second shell 120.

[0072] When a general soft-pack battery 20 is used, the soft-pack battery 20 may include the exhaust assembly 150 provided in the aforementioned solution in addition to the first shell 110. The difference is that the exhaust assembly 150 does not need to have a pressure control function at this time, that is, the exhaust assembly 150 is only used to connect the first chamber 111 with the outside. This connection can be a direct connection between the outside and the first chamber 111, or it can be an indirect connection to the first chamber 111 through the second chamber 121 as in the aforementioned solution.

[0073] The soft-pack battery 20 is provided with a pipe or channel that can communicate with the outside so as to achieve exhaust to the outside, and can be adapted to the pressure component 30 of the present application.

[0074] Reference Figures 15 to 22As shown, in some embodiments of the present application, the pressure-applying assembly 30 includes: a chamber body 303, a pressure plate 301, an adjusting member 302, a one-way valve 304, an air collecting pipe 305, a movable plate 306, a force spring 307, a guide column 308, a force-equalizing spring 309, a retaining ring 313, a nut block 314, and a force-bearing patch 312.

[0075] Among them, the warehouse body 303 is used to accommodate multiple pressure plates 301 and the first shell 110; the multiple pressure plates 301 are used to clamp the first shell 110 from both sides; the adjustment member 302 is used to adjust the pressure applied by the pressure plate 301 to the first shell 110; the one-way valve 304 is used to make the first chamber 111 and the outside form a one-way connection for gas discharge; the exhaust component 150 also includes: a gas collecting pipe 305, which is used to be respectively connected to the inside of multiple soft-pack batteries 20 so that the gases discharged from them are gathered to the one-way valve 304.

[0076] By adopting the above solution, when the soft-pack battery 20 generates gas and causes the soft-pack battery 20 to expand, the first shell 110 of the soft-pack battery 20 can be squeezed from both sides by the pressing plate 301 to discharge the gas from the first shell 110 or the soft-pack battery 20 through the exhaust assembly 150.

[0077] Reference Figures 15 to 22 As shown, in some embodiments of the present application, a plurality of guide posts 308 are provided inside the warehouse body 303 , and a plurality of guide holes 3011 are provided on the pressure plate 301 for the guide posts 308 to pass through, so that the pressure plate 301 and the warehouse body 303 form a sliding connection.

[0078] In some embodiments of the present application, a plurality of equalizing springs 309 are sleeved on the guide column 308 . The equalizing springs 309 are disposed between the two pressure plates 301 to apply elastic force to the two pressure plates 301 to separate them.

[0079] Such a solution allows the pressure applied from one side to be evenly applied to each soft-pack battery 20. At the same time, after the external pressure is removed, the pressure plate 301 can be reset, rather than the pressure plate 301 being reset by the soft-pack battery 20 expanding again, so as to avoid hindering the gas production of the soft-pack battery 20 and affecting its performance.

[0080] Reference Figures 17 to 22 As shown, in some embodiments of the present application, the movable plate 306 may also be provided with a guide hole 3011 for the guide column 308 to pass through, so as to form a sliding connection with the warehouse body 303 in a manner similar to the cooperation between the pressure plate 301 and the warehouse body 303. The movable plate 306 is disposed between the plurality of pressure plates 301 and the adjusting member 302.

[0081] The adjusting member 302 is constructed as an adjusting bolt. The adjusting member 302 is rotationally connected to the housing 303 through a portion without threads. A nut block 314 is mounted on a portion of the adjusting member 302 with threads, so that the nut block 314 is driven to translate when the adjusting member 302 rotates. The movable plate 306 is fixedly connected to the nut block 314, so that the movable plate 306 is driven to move when the nut block 314 moves. A force spring 307 is provided between the nut block 314 and the outermost pressure plate 301, or a force spring 307 may be provided between the movable plate 306 and the outermost pressure plate 301. When the nut block 314 or the movable plate 306 moves, the force spring 307 is compressed to increase or decrease the pressure acting on the outermost pressure plate 301. Then, the force is transmitted between different pressure plates 301 through the equalizing spring 309, so that the two pressure plates 301 pressurize and exhaust the soft-pack batteries 20 between them. Refer to Fig.18 As shown, the retaining ring 313 is used to limit the position of the adjusting member 302 .

[0082] Reference Fig.17 , Fig.18 and Fig. 22 As shown, in some embodiments of the present application, a force patch 312 can be provided at the outermost pressure plate 301. The force patch 312 is a pressure-sensitive patch that can generate an electrical signal according to the force. The force patch 312 can be used to detect the pressure value of the force spring 307, thereby prompting the user to adjust the adjusting member 302.

[0083] As an extended solution, the adjusting member 302 can be connected to a motor, so that the adjusting member 302 is automatically driven to rotate under the drive of the motor. A controller or a single chip microcomputer can be provided to control the motor according to the signal of the force patch 312 so that the adjusting member 302 applies a corresponding force to the soft pack battery 20.

[0084] As a more specific extension, a plurality of pressure sensors may be provided to detect the pressure of the first chamber 111 or the second chamber 121, or a pressure sensor may be provided to detect the pressure at the one-way valve 304 on the final gas manifold 305. The controller may control the movement of the regulating member 302 according to the pressures at the first chamber 111, the second chamber 121, and the gas manifold 305.

[0085] In this way, pressure can be applied adaptively to obtain the desired exhaust effect. As an extended solution, as an optional solution, the threaded part of the adjusting member can be directly connected to the bin body, and the bin body is provided with corresponding threaded holes, so that when the adjusting member is rotated, the end position of the adjusting member can be changed, and the end of the adjusting member can be directly pressed against the outermost pressure plate. In this way, components such as movable plates and force springs can be omitted.

[0086] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A soft pack battery, characterized in that: The soft pack battery comprises: a first housing formed with a first chamber for accommodating an electrolyte; A second housing is formed with a second chamber for accommodating gas discharged from the electrolyte; The exhaust component is used to control whether the second chamber is connected to the outside so that the second chamber is connected to the outside when the gas pressure in the second chamber reaches a preset pressure.

2. The soft pack battery according to claim 1, characterized in that: The soft pack battery also includes: Positive and negative electrodes; The positive electrode and the negative electrode extend from the first chamber to the second chamber and are at least partially exposed from the second shell.

3. The soft pack battery according to claim 2, characterized in that: The soft pack battery also includes: A connecting body, arranged between the first shell and the second shell; Wherein, the connector is formed with connecting channels respectively communicating with the first chamber and the second chamber.

4. The soft pack battery according to claim 3, characterized in that: in, The second shell is disposed between the positive electrode and the first shell.

5. The soft pack battery according to claim 4, characterized in that: in, The second case is disposed between the negative electrode and the first case.

6. The soft pack battery according to claim 5, characterized in that: The connecting channel is arranged on the side of the connecting body.

7. The soft pack battery according to claim 1, It is characterized in that Wherein, the exhaust assembly comprises: a catheter having an inlet port inserted into the second chamber; A tube sealing device, used for sealing the outlet of the catheter; Wherein, the tube sealing device is installed at the outlet of the catheter.

8. The soft pack battery according to claim 7, characterized in that: in, The exhaust assembly also includes: The sealant is used to form a seal between the conduit and the inner wall of the second shell.

9. The soft pack battery according to claim 8, characterized in that: in, The pipe sealing device comprises an explosion-proof membrane which can be broken under a preset pressure.

10. The soft pack battery according to any one of claims 1 to 9, characterized in that: in, The first shell and the second shell are both soft-pack shells; the preset pressure ranges from 0.2 standard atmospheric pressure to 0.1 standard atmospheric pressure.

11. A method for manufacturing a soft-pack battery according to any one of claims 1 to 10.

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