Battery processing method, battery and battery capacity grading cabinet
By using porous tape and a capacity testing cabinet, the problem of excessive free electrolyte inside soft-pack lithium-ion batteries was solved, improving battery life and miniaturization capabilities.
Patent Information
- Application Number
- CN202411011801.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2026-01-27
AI Technical Summary
Existing soft-pack lithium-ion batteries have too much free electrolyte inside, which leads to electrolyte swelling, hinders miniaturization, and affects service life.
The bare battery cells are bonded and shaped using porous tape and then covered with aluminum-plastic film to form a protective sleeve. Combined with the charging and discharging module and pressure head assembly of the capacity distribution cabinet, the electrolyte penetration and electrode gap are controlled to increase the content of absorbable electrolyte.
It increases the absorption of electrolyte inside the bare cell, reduces the possibility of electrolyte swelling, extends battery life, and helps in battery miniaturization.
Smart Images
Figure CN121416626A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of battery processing technology, and in particular to a battery processing method, a battery, and a battery capacity distribution cabinet. Background Technology
[0002] Nowadays, pouch lithium-ion batteries are widely used in electronic products, and battery life is gradually becoming one of the criteria users use when choosing electronic products.
[0003] Inside a battery, the electrolyte exists in two forms: absorbable electrolyte and free electrolyte. The total amount of these two forms of electrolyte is called the electrolyte content of the battery. Generally, the lifespan of a pouch lithium-ion battery is directly proportional to the electrolyte content inside the battery.
[0004] Currently, if there is too much free electrolyte inside the battery, it may not only cause electrolyte swelling, but also hinder the miniaturization of the battery. Therefore, how to increase the content of absorbable electrolyte inside the soft-pack lithium-ion battery has become a key issue in improving the battery's lifespan. Summary of the Invention
[0005] This disclosure provides a battery processing method, a battery, and a battery capacity testing cabinet, which can solve the technical problems existing in related technologies. The technical solutions of the battery processing method, battery, and battery capacity testing cabinet are as follows:
[0006] In a first aspect, this disclosure provides a battery processing method, the method comprising:
[0007] The positive electrode, separator and negative electrode are stacked and then wound to form a bare cell;
[0008] The bare battery cell is shaped and secured using adhesive tape, which allows electrolyte to pass through.
[0009] The bare battery cell is wrapped with an aluminum-plastic film to form a protective sleeve with an open structure;
[0010] Electrolyte is injected into the interior of the protective sleeve through the opening;
[0011] The opening is sealed.
[0012] In one possible implementation, the method of using adhesive tape to shape the bare battery cell includes:
[0013] Perforated tape is punched to obtain porous tape.
[0014] The bare battery cell is attached and shaped using the porous tape, which has multiple spaced through holes.
[0015] In one possible implementation, the porous tape used is green adhesive.
[0016] In one possible implementation, the through hole is a circular through hole with a diameter in the range of [0.1 mm, 1 mm].
[0017] In one possible implementation, after encapsulating the opening, the method further includes:
[0018] The battery is placed in a capacity grading cabinet for capacity grading.
[0019] In one possible implementation, placing the battery in a capacity-grading cabinet and performing capacity-grading on the battery includes:
[0020] Fix the battery to the surface of the capacity-separating platform;
[0021] The battery is electrically connected to the charge / discharge module;
[0022] The battery is controlled to discharge by the charging and discharging module, and the battery is continuously pressed with a first pressure by the pressure head assembly.
[0023] The battery is charged by the charging and discharging module, and the battery is continuously pressed with a second pressure by the pressure head assembly, the second pressure being greater than the first pressure.
[0024] The battery is controlled to discharge by the charging and discharging module, and the battery is continuously pressed with a third pressure by the pressure head assembly, the third pressure being less than the second pressure.
[0025] In one possible implementation, both the first pressure and the third pressure are located in the range of [0.01 MPa, 0.1 MPa], and the second pressure is located in the range of [0.1 MPa, 10 MPa].
[0026] In one possible implementation, before filling the protective sleeve with electrolyte via the opening, the method further includes:
[0027] Use a dryer to dry the batteries.
[0028] Secondly, this disclosure provides a battery, which includes a bare cell, tape, protective sleeve and electrolyte;
[0029] The bare cell includes a stacked and wound positive electrode, a separator, and a negative electrode;
[0030] The tape is adhered to the outer wall of the bare battery cell to shape the bare battery cell, and the tape allows the electrolyte to pass through.
[0031] The protective sleeve seals and covers the bare battery cell;
[0032] The electrolyte is located inside the protective sleeve.
[0033] Thirdly, this disclosure provides a battery capacity testing cabinet, which includes a cabinet body, a capacity testing platform, a charging and discharging module, a pressure head assembly, and a controller;
[0034] The compartmentation platform is located inside the cabinet.
[0035] The connection harness of the charging and discharging module is located on the capacity testing platform and is used for electrical connection with the battery;
[0036] The pressure head assembly is located inside the cabinet and above the capacity sorting platform, and is used to continuously press the battery placed on the capacity sorting platform;
[0037] The controller is electrically connected to the charging / discharging module and the pressure head assembly, respectively, and is used for:
[0038] Based on the obtained capacity indication information, the charging and discharging module controls the battery to discharge and controls the pressure head assembly to continuously press the battery with a first pressure, or the charging and discharging module charges the battery and controls the pressure head assembly to continuously press the battery with a second pressure, or the charging and discharging module controls the battery to discharge and controls the pressure head assembly to continuously press the battery with a third pressure.
[0039] Wherein, both the first pressure and the third pressure are less than the second pressure.
[0040] The technical solution provided in this disclosure includes at least the following beneficial effects:
[0041] This disclosure provides a battery processing method in which a wound bare battery cell is bonded and shaped using an adhesive tape that allows electrolyte to pass through. Because the tape allows electrolyte to pass through, even in areas covered by the tape, the electrolyte can still penetrate the bare battery cell and fully wet the positive electrode, separator, and negative electrode. This increases the amount of absorbable electrolyte inside the bare battery cell, reduces the likelihood of electrolyte swelling, and thus extends the battery's lifespan.
[0042] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description
[0043] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. In the drawings:
[0044] Figure 1This is a schematic diagram of a bare battery cell formed by stacking and winding a positive electrode sheet, a separator, and a negative electrode sheet, according to an embodiment of this disclosure.
[0045] Figure 2 This is a schematic diagram of a bare battery cell with adhesive tape attached, provided in an embodiment of this disclosure;
[0046] Figure 3 This is a schematic diagram of a process for wrapping bare battery cells with aluminum-plastic film according to an embodiment of this disclosure;
[0047] Figure 4 This is a schematic diagram of a bare battery cell with adhesive tape attached, provided in an embodiment of this disclosure;
[0048] Figure 5 This is a schematic flowchart of a battery processing method provided in an embodiment of this disclosure;
[0049] Figure 6 This is a schematic diagram of a process for perforating adhesive tape provided in an embodiment of this disclosure;
[0050] Figure 7 This is a schematic diagram of the structure of a battery capacity sorting cabinet provided in an embodiment of this disclosure;
[0051] Figure 8 This is a schematic flowchart of a battery processing method provided in an embodiment of this disclosure.
[0052] Legend
[0053] 1. Bare battery cells;
[0054] 11. Positive electrode plate; 12. Separator; 13. Negative electrode plate;
[0055] 2. Adhesive tape;
[0056] 21. Through-hole tape; 2a. Non-porous tape; 2b. Porous tape;
[0057] 3. Protective cover;
[0058] 31. Opening;
[0059] 100. Battery capacity testing cabinet;
[0060] 101. Container dividing platform;
[0061] 102. Charging / discharging module;
[0062] 103. Pressure head assembly;
[0063] 104. Cabinet;
[0064] 105. Controller.
[0065] The accompanying drawings have illustrated specific embodiments of this disclosure, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this disclosure to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0066] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings.
[0067] Currently, pouch lithium-ion batteries are widely used in electronic products in fields such as digital devices, Bluetooth, and wearables due to their advantages of high energy density, low cost, and easy manufacturing. For these electronic products, battery lifespan has gradually become one of the key factors users consider when choosing a product. Inside the battery, the electrolyte exists in two forms: absorbable electrolyte and free electrolyte. The total amount of these two forms of electrolyte is called the battery's electrolyte content. Generally, the lifespan of a pouch lithium-ion battery is directly proportional to the amount of electrolyte inside the battery. Currently, if there is too much free electrolyte inside the battery, it may not only lead to electrolyte swelling but also hinder battery miniaturization. Therefore, how to increase the absorbable electrolyte content inside pouch lithium-ion batteries is an urgent problem to be solved in the industry, and it is also the technical problem that this disclosure aims to address.
[0068] This disclosure provides a battery processing method applied to a processing system for soft-pack lithium-ion batteries, which includes a winding machine, a glue wrapping machine, a secondary sealing machine, a liquid injection machine, and a capacity separation cabinet.
[0069] The following describes specific implementation methods. Figure 5 The detailed process of the battery processing method shown is explained in the following way:
[0070] In step 501, the positive electrode 11, the separator 12 and the negative electrode 13 are stacked and wound to form a bare battery cell 1.
[0071] In one example, see Figure 1 The positive electrode 11, the separator 12 and the negative electrode 13 all have a rectangular thin plate structure, and the shape and size of the positive electrode 11, the separator 12 and the negative electrode 13 are all matched.
[0072] The positive electrode 11 can be a rectangular thin plate structure made of lithium cobalt oxide, lithium manganese oxide or lithium iron phosphate, the separator 12 can be a rectangular thin plate structure made of polyethylene, polypropylene or polytetrachloroethylene, and the negative electrode 13 can be a rectangular thin plate structure made of graphite or silicon.
[0073] In practice, the bare battery cell 1 is formed by stacking and winding two layers of separators 12, a positive electrode 11, and a negative electrode 13. The arrangement order of the positive electrode 11, separators 12, and negative electrode 13 can be: positive electrode 11, first separator 12, negative electrode 13, and second separator 12. During winding, either the positive electrode 11 or the second separator 12 can be closest to the winding center. Alternatively, the arrangement order can be: first separator 12, positive electrode 11, second separator 12, and negative electrode 13. During winding, either the negative electrode 13 or the first separator 12 can be closest to the winding center.
[0074] In one example, the positive electrode 11 includes a first electrode body and a first tab connected together, and the negative electrode 13 includes a second electrode body and a second tab connected together. The first electrode body, the second electrode body, and the separator 12 may have a rectangular thin plate structure. The first tab and the second tab extend beyond the separator 12 after being wound up, so that after the bare cell is covered with an aluminum-plastic film, the first tab and the second tab can be partially placed outside the aluminum-plastic film, which facilitates the electrical connection between the soft-pack lithium-ion battery and electronic devices.
[0075] In one example, the above winding process can be completed by a winding machine.
[0076] The winding machine can be movable, and its surface can have mounting positions for stacking the positive electrode 11, the separator 12, and the negative electrode 13. The shape and size of these mounting positions are adapted to the shape and size of the positive electrode 11, and the stacked positive electrode 11, separator 12, and negative electrode 13 can be fixed at the mounting positions. Subsequently, the winding machine winds the stacked positive electrode 11, separator 12, and negative electrode 13 to form a bare battery cell 1.
[0077] See Figure 1 The bare cell 1 can have a similar rectangular plate structure. The walls on both sides of the center of the bare cell 1 are arc-shaped, and the end of the bare cell 1 is located on the top wall.
[0078] In step 502, adhesive tape 2 is used to attach and shape the bare battery cell 1. The adhesive tape 2 allows the electrolyte to pass through.
[0079] Understandably, in step 501, the positive electrode 11, separator 12, and negative electrode 13 are wound to form a bare battery cell 1. Since the positive electrode 11, separator 12, and negative electrode 13 are elastic, if the bare battery cell 1 is not shaped, the wound bare battery cell 1 will gradually unravel and revert to its stacked state. Therefore, after winding to form the bare battery cell 1, it is necessary to use adhesive tape 2 to adhere and shape the bare battery cell 1.
[0080] It is understandable that the application of tape 2 to attach and shape the bare battery cell 1 can be done by a tape wrapping machine or by manual labor.
[0081] In one example, see Figure 1 The bare cell 1 has a similar cubic structure and includes a first wall, a second wall, a third wall, a fourth wall, a fifth wall, and a sixth wall.
[0082] The first and second walls are rectangular walls distributed on both sides of the winding center of the bare cell 1, the third and fourth walls are arc-shaped walls distributed on both sides of the winding center of the bare cell 1, and the fifth and sixth walls are rounded rectangular walls distributed on the winding center of the bare cell 1.
[0083] In implementation, see Figure 2 The opening of the bare battery cell 1 is located on the first wall surface. When using tape 2 to adhere and shape the bare battery cell 1, tape 2 can be placed on the fifth wall surface at positions on both sides of the opening, with both ends of tape 2 adhering to the first and second wall surfaces respectively. Further, tape 2 can be placed on the sixth wall surface at a position corresponding to the opening, with both ends of tape 2 adhering to the first and second wall surfaces respectively. Even further, tape 2 can be placed at the opening on the first wall surface.
[0084] Using the aforementioned adhesive tape 2 bonding method can improve the stability of the shaped bare battery cell 1. Furthermore, see... Figure 4 Since the tape 2 allows the electrolyte to pass through, even if the tape 2 is adhered to the fifth and sixth wall surfaces, the electrolyte can still pass through the tape 2 and flow through the fifth and sixth wall surfaces to the gap between the positive electrode 11, the diaphragm 12 and the negative electrode 13.
[0085] In one example, see Figure 2 The tape 2 can have multiple through holes 21. That is, the tape 2 is a porous tape, and the pore diameter of the through holes 21 is larger than the molecular volume of the electrolyte. Thus, the electrolyte can flow into the bare cell 1 through the through holes 21, so that the positive electrode 11, the separator 12 and the negative electrode 13 inside the bare cell 1 can fully contact the electrolyte. This allows the positive electrode 11, the separator 12 and the negative electrode 13 inside the bare cell 1 to be fully wetted with the electrolyte, thereby increasing the content of absorbable electrolyte in the bare cell 1.
[0086] In one example, before performing step 502, the non-porous tape 2a can be perforated to obtain a porous tape 2b. Then, the porous tape 2b is used to adhere and shape the bare battery cell 1.
[0087] The porous tape 2b has multiple through holes 21 arranged at intervals.
[0088] For example, the tape 2 mentioned above can be green adhesive. This can reduce the overall processing cost of the battery and improve the shaping stability of the bare cell 1.
[0089] For details, please refer to Figure 6 The multiple through holes 21 on the porous tape 2b described above can be arranged in an alternating pattern. For example... Figure 6 As shown, the porous tape 2b has multiple rows of through holes 21 arranged at intervals, and there is another row of through holes 21 between two adjacent rows of through holes 21. This row of through holes 21 is arranged alternately with the two adjacent rows of through holes 21.
[0090] This increases the density of the through holes 21, allowing the electrolyte to penetrate more easily through the porous tape 2b.
[0091] In one example, the aforementioned through hole 21 is a circular through hole with a diameter in the range of [0.1 mm, 1 mm].
[0092] For example, the aforementioned through hole 21 can be a circular through hole with a diameter of 0.5 mm.
[0093] Optionally, the diameters of the plurality of through holes 21 may be the same or different. All through holes 21 may be circular through holes with a diameter of 0.5 mm. Alternatively, some of the through holes 21 may be circular through holes with a diameter of 0.5 mm, while the other part of the through holes 21 may be circular through holes with a diameter of 0.2 mm. This embodiment of the present disclosure does not limit this.
[0094] In related technologies, after the bare battery cell 1 is wound to form, a non-porous tape is usually used to adhere and shape the bare battery cell 1. This makes it difficult for the electrolyte to enter the interior of the bare battery cell 1 at the location covered by the tape. However, with the technical solution provided in this disclosure, since the tape used for adhering and shaping the bare battery cell 1 is a porous tape 2b, the porous tape 2b not only adheres and shapes the bare battery cell 1 but also leaves multiple through holes 21 for the electrolyte. This allows the electrolyte to enter the interior of the bare battery cell 1 through the through holes 21, increasing the absorbable electrolyte content inside the bare battery cell 1.
[0095] In step 503, the bare battery cell 1 is wrapped with an aluminum-plastic film to form a protective sleeve 3 with an opening 31.
[0096] In one example, see Figure 3 The aluminum-plastic film is a rectangular film with a size larger than that of the bare battery cell 1. Specifically, the width of the aluminum-plastic film can be slightly larger than the length of the bare battery cell 1, and the length of the aluminum-plastic film can be slightly larger than twice the width of the bare battery cell.
[0097] In implementation, when using aluminum-plastic film to cover the bare battery cell 1, the bare battery cell 1 can first be placed on one half of the aluminum-plastic film. Then, the other half of the aluminum-plastic film is folded in half and bent towards the bare battery cell 1, so that the aluminum-plastic film is folded along the edge of the bare battery cell 1. Subsequently, refer to... Figure 3 A heat-sealing process can be used to seal the aluminum-plastic films on both sides corresponding to the top position of the bare battery cell, and a heat-sealing process can be used to seal the aluminum-plastic films on both sides corresponding to one side of the bare battery cell. In this way, an opening 31 can be formed between the aluminum-plastic films on both sides corresponding to the other side of the bare battery cell.
[0098] The process of wrapping the bare battery cell 1 with aluminum-plastic film to form a protective sleeve 3 with an opening 31 can be completed by a secondary sealing machine in the battery processing system.
[0099] The electrolyte in the battery can be a mixed solution of an organic solvent and a lithium salt. The organic solvent can be ethyl methyl carbonate, ethyl methyl carbonate, etc., and the lithium salt can be lithium hexafluorophosphate, etc. This embodiment does not limit this.
[0100] In steps 504 and 505, electrolyte is injected into the protective sleeve 3 through the opening 31. After the electrolyte filling process is completed, the opening 31 is sealed.
[0101] In practice, electrolyte can be drawn from the liquid injection machine and then filled into the protective sleeve 3 through the opening 31. After the electrolyte filling process is completed, the opening 31 can be sealed again using a secondary sealing machine to obtain the battery.
[0102] Specifically, the electrolyte injected into the protective sleeve 3 enters the bare cell from the top (i.e., the fifth wall surface mentioned above) and bottom (i.e., the sixth wall surface mentioned above). For the areas on the fifth and sixth walls not covered by the adhesive tape 2, the electrolyte can flow directly into the gap between the positive electrode 11, the separator 12, and the negative electrode 13, entering the interior of the bare cell 1 and fully wetting the positive electrode 11, the separator 12, and the negative electrode 13. For the areas on the fifth and sixth walls covered by the adhesive tape 2, since the adhesive tape 2 has multiple through holes 21 for electrolyte penetration, the electrolyte can first pass through the adhesive tape 2 and then flow into the gap between the positive electrode 11, the separator 12, and the negative electrode 13, entering the interior of the bare cell 1 and fully wetting the positive electrode 11, the separator 12, and the negative electrode 13.
[0103] In some possible embodiments, the battery processing steps may further include drying the battery using a dryer before step 501.
[0104] This prevents moisture from remaining inside the battery and improves the safety of battery processing.
[0105] In some possible embodiments, after the opening 31 is sealed, the battery can be placed in a capacity grading cabinet for capacity grading.
[0106] See Figure 7 The processing system for soft-pack lithium-ion batteries also includes a battery capacity grading cabinet 100, which includes a cabinet body 104, a capacity grading platform 101, a charge / discharge module 102, a pressure head assembly 103, and a controller 105.
[0107] The following describes specific implementation methods. Figure 8 The detailed process of the capacity expansion steps shown is explained in the following manner:
[0108] In step 801, the battery is fixed to the surface of the capacity-separating platform 101.
[0109] See Figure 7 The surface of the capacity distribution platform 101 may have mounting positions for placing batteries, where the batteries can be fixed.
[0110] For example, the surface of the capacity sorting station 101 may have multiple mounting positions, and multiple batteries are installed in different mounting positions. That is, multiple batteries can be sorted at the same time by the battery capacity sorting cabinet 100, thereby improving the capacity sorting efficiency.
[0111] Specifically, the partition platform 101 can be a cubic boss, and the partition platform 101 is disposed inside the cabinet 104 and connected to the bottom wall of the cabinet 104. The cabinet 104 may or may not have a movable function, and this embodiment does not limit this.
[0112] In step 802, the battery is electrically connected to the charge / discharge module 102.
[0113] See Figure 7 The charging and discharging module 102 can be installed inside the cabinet 104 and connected to the bottom wall of the cabinet 104. The connection harness of the charging and discharging module 102 is located at least partially on the capacity distribution platform 101 and is fixedly connected to the capacity distribution platform 101.
[0114] In implementation, the charging and discharging module 102 may include two connecting wire harnesses, which are respectively in contact with the first tab and the second tab of the battery to realize the electrical connection between the charging and discharging module 102 and the battery.
[0115] For example, the charge / discharge module 102 may include multiple pairs of connecting wire groups, each pair of connecting wire groups including two connecting wire harnesses. In implementation, multiple batteries are correspondingly mounted on the surface of the capacity-classifying platform 101, and the two connecting wire harnesses of each connecting wire group respectively contact the first tab and the second tab of a battery, thereby realizing the electrical connection between the charge / discharge module 102 and the multiple batteries.
[0116] In step 803, the battery is discharged by the charge / discharge module 102, and the battery is continuously pressed with a first pressure by the pressure head assembly 103.
[0117] In one example, the first pressure is located in the range of [0.01MPa, 0.1MPa).
[0118] For example, the first pressure can be 0.1 MPa.
[0119] In practice, before the capacity testing, although the electrolyte inside the battery can flow directly into the gap between the positive electrode 11, the separator 12 and the negative electrode 13 and enter the bare cell 1, or first flow through the through hole 21 of the tape 2 and then into the gap between the positive electrode 11, the separator 12 and the negative electrode 13 and enter the bare cell 1, the degree to which the positive electrode 11, the separator 12 and the negative electrode 13 are wetted with electrolyte is still limited. In step 803, the battery discharge is controlled by the charge / discharge module 102. During the discharge process, the positive electrode 11 and the negative electrode 13 shrink, thereby increasing the gap between the positive electrode 11, the separator 12, and the negative electrode 13. At this time, the pressure head assembly 103 applies a small pressure to the battery, which can cause the positive electrode 11, the separator 12, and the negative electrode 13 to deform. This facilitates the electrolyte to flow into the gap and enter the bare cell 1, thereby increasing the degree of electrolyte wetting of the positive electrode 11, the separator 12, and the negative electrode 13, and thus increasing the content of absorbable electrolyte inside the battery, reducing the possibility of battery swelling, and improving the battery's service life.
[0120] In step 804, the battery is charged by the charge / discharge module 102 and the battery is continuously pressed with a second pressure using the pressure head assembly 103.
[0121] The second pressure is greater than the first pressure.
[0122] In one example, the second pressure is located in the range of [0.1 MPa, 10 MPa].
[0123] For example, the second pressure can be 10 MPa.
[0124] In practice, the battery is charged via the charge / discharge module 102. During charging, the positive electrode 11 and negative electrode 13 expand rapidly. At this time, the pressure head assembly 103 applies a large pressure to the battery, which can suppress the expansion trend of the positive electrode 11 and negative electrode 13, ensuring that the overall thickness of the battery remains almost unchanged. Simultaneously, the pressure head assembly 103 applies a large pressure to the battery, causing deformation of the positive electrode 11 and negative electrode 13. This changes the shape of the gaps between the positive electrode 11, separator 12, and negative electrode 13, allowing electrolyte to enter the bare cell 1 through these gaps. This increases the degree of electrolyte wetting of the positive electrode 11, separator 12, and negative electrode 13, thereby increasing the content of absorbable electrolyte inside the battery, reducing the possibility of electrolyte swelling, and extending the battery's lifespan.
[0125] Meanwhile, in step 804, the pressure head assembly 103 applies a large pressure to the battery and presses it continuously, which can increase the battery's hardness and make the overall shape of the battery tend to be flat, which is beneficial for subsequent battery assembly.
[0126] In step 805, the battery is discharged by the charge / discharge module 102, and the battery is continuously pressed with a third pressure by the pressure head assembly 103.
[0127] The third pressure is less than the second pressure.
[0128] In one example, the third pressure is located in the range of [0.01MPa, 0.1MPa).
[0129] For example, the third pressure can be 0.1 MPa.
[0130] In practice, the battery discharge is controlled by the charge / discharge module 102. During the discharge process, the positive electrode 11 and the negative electrode 13 shrink, thereby increasing the gap between the positive electrode 11, the separator 12, and the negative electrode 13. At this time, the pressure head assembly 103 applies a small pressure to the battery and continuously presses the battery. This can cause the electrolyte that was squeezed out of the bare cell 1 by the electrode expansion in step 804 to flow back to the gap between the positive electrode 11, the separator 12, and the negative electrode 13. This facilitates the electrolyte flowing into the gap and entering the interior of the bare cell 1, thereby increasing the degree of electrolyte wetting of the positive electrode 11, the separator 12, and the negative electrode 13, and thus increasing the content of absorbable electrolyte inside the battery, reducing the possibility of battery swelling, and improving the battery's service life.
[0131] It is understood that the first pressure and the third pressure mentioned above may be the same or different, and this disclosure does not limit this.
[0132] This disclosure provides a battery, see [link to relevant documentation]. Figure 1 and Figure 3 The battery includes a bare cell 1, tape 2, protective sleeve 3, and electrolyte. The bare cell 1 includes a stacked and wound positive electrode 11, a separator 12, and a negative electrode 13. The tape 2 is attached to the outer wall of the bare cell 1 to shape the bare cell 1. The tape 2 allows the electrolyte to pass through. The protective sleeve 3 seals and covers the bare cell 1, and the electrolyte is located inside the protective sleeve 3.
[0133] This disclosure provides a battery capacity grading cabinet 100, see [link to relevant documentation] Figure 7 The battery capacity testing cabinet 100 includes a cabinet 104, a capacity testing platform 101, a charge / discharge module 102, a pressure head assembly 103, and a controller 105. The capacity testing platform 101 is located inside the cabinet 104. The connection harness of the charge / discharge module 102 is located on the capacity testing platform 101 for electrical connection with the battery. The pressure head assembly 103 is located inside the cabinet 104 and above the capacity testing platform 101 for continuously pressing the battery placed on the capacity testing platform 101. The controller 105 is electrically connected to the charge / discharge module 102 and the pressure head assembly 103 respectively, and is used to: control the battery to discharge and control the pressure head assembly 103 to continuously press the battery with a first pressure based on the acquired capacity testing indication information; or charge the battery to charge and control the pressure head assembly 103 to continuously press the battery with a second pressure; or control the battery to discharge and control the pressure head assembly 103 to continuously press the battery with a third pressure based on the charge / discharge module 102. The first and third pressures are both less than the second pressure.
[0134] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0135] It is understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.
[0136] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.
[0137] It is further understood that the terms “center,” “longitudinal,” “lateral,” “front,” “rear,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this embodiment 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.
[0138] It is further understood that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the two components; they can refer to a direct connection between two components without the presence of other components, or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.
[0139] It is further understood that although operations are described in a specific order in the accompanying drawings in the embodiments of this disclosure, this should not be construed as requiring these operations to be performed in the specific order or serial order shown, or requiring all of the shown operations to be performed to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.
[0140] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the solutions disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the scope of the claims.
[0141] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.
Claims
1. A battery processing method, characterized in that, The method includes: The positive electrode (11), the separator (12) and the negative electrode (13) are stacked and then wound to form a bare battery cell (1); The bare battery cell (1) is attached and shaped using tape (2), which allows the electrolyte to pass through. The bare battery cell (1) is wrapped with aluminum-plastic film to form a protective sleeve (3) with an opening (31); Electrolyte is injected into the interior of the protective sleeve (3) through the opening (31); The opening (31) is sealed.
2. The method according to claim 1, characterized in that, The method of using tape (2) to adhere and shape the bare battery cell (1) includes: The non-porous tape (2a) is perforated to obtain a porous tape (2b); The bare battery cell (1) is attached and shaped using the porous tape (2b), which has a plurality of spaced through holes (21).
3. The method according to claim 2, characterized in that, The porous tape (2b) used is green adhesive.
4. The method according to claim 2, characterized in that, The through hole (21) is a circular through hole with a diameter in the range of [0.1 mm, 1 mm].
5. The method according to claim 2, characterized in that, After sealing the opening (31), the method further includes: The battery is placed in the battery capacity grading cabinet (100) and the battery is subjected to capacity grading.
6. The method according to claim 5, characterized in that, The step of placing the battery in a capacity-classifying cabinet and performing capacity-classifying processing on the battery includes: The battery is fixed to the surface of the capacity-separating platform (101); The battery is electrically connected to the charge / discharge module (102); The battery is controlled to discharge by the charging and discharging module (102), and the battery is continuously pressed with a first pressure by the pressure head assembly (103). The battery is charged by the charging and discharging module (102), and the battery is continuously pressed with a second pressure by the pressure head assembly (103), the second pressure being greater than the first pressure; The battery is controlled to discharge by the charging and discharging module (102), and the battery is continuously pressed with a third pressure by the pressure head assembly (103), the third pressure being less than the second pressure.
7. The method according to claim 6, characterized in that, The first pressure and the third pressure are both within the range of [0.01MPa, 0.1MPa], and the second pressure is within the range of [0.1MPa, 10MPa].
8. The method according to claim 1, characterized in that, Before filling the protective sleeve (3) with electrolyte through the opening (31), the method further includes: Use a dryer to dry the batteries.
9. A battery, characterized in that, The battery includes a bare cell (1), tape (2), protective sleeve (3), and electrolyte; The bare cell (1) includes a stacked and wound positive electrode (11), a separator (12) and a negative electrode (13); The tape (2) is adhered to the outer wall of the bare battery cell (1) to shape the bare battery cell (1), and the tape (2) allows the electrolyte to pass through; The protective sleeve (3) seals and covers the bare battery cell (1); The electrolyte is located inside the protective sleeve (3).
10. A battery capacity testing cabinet (100), characterized in that, The battery capacity sorting cabinet (100) includes a cabinet (104), a capacity sorting platform (101), a charging and discharging module (102), a pressure head assembly (103), and a controller (105); The container platform (101) is located inside the cabinet (104); The connection harness of the charging and discharging module (102) is located on the capacity testing platform (101) and is used for electrical connection with the battery; The pressure head assembly (103) is located inside the cabinet (104) and above the capacity distribution platform (101), and is used to continuously press the battery placed on the capacity distribution platform (101); The controller (105) is electrically connected to the charging / discharging module (102) and the pressure head assembly (103) respectively, and is used for: Based on the obtained capacity indication information, the charging and discharging module (102) controls the battery to discharge and controls the pressure head assembly (103) to continuously press the battery with a first pressure, or the charging and discharging module (102) charges the battery and controls the pressure head assembly (103) to continuously press the battery with a second pressure, or the charging and discharging module (102) controls the battery to discharge and controls the pressure head assembly (103) to continuously press the battery with a third pressure; Wherein, both the first pressure and the third pressure are less than the second pressure.