Hot-pressing laminate and formation clamp

Abstract

The utility model relates to the technical field of battery manufacturing, and provides a hot-pressing laminate and a formation clamp. The utility model relates to a hot-pressing laminated plate which is suitable for various battery cells with different sizes. Each hot-pressing laminated plate comprises a laminated plate body, the at least two formation charging panels are provided with positive and negative electrode contacts, are arranged on the laminate body at intervals and are divided into a plurality of battery cell placing areas; the adjusting mechanism is fixedly connected to the tail end of the formation charging plate and is used for adjusting the height of the formation charging plate so that the battery cell tab is in contact with the positive contact and the negative contact; according to the utility model, four battery cells can be arranged, and meanwhile, the number of the placed battery cells is reduced to half. And a battery with a larger size is compatible, so that the production efficiency in the battery cell formation process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery manufacturing, and more specifically to a hot pressing layer plate. Background Art

[0002] As a process step in the battery cell manufacturing process, formation refers to the supply of small current to the battery cell for charging after liquid injection. The purpose is to transform the lithium-ion battery from a "pile of materials" into a stable "electrochemical system". In other words, all processes in the formation process are aimed at achieving stable and efficient transformation.

[0003] The existing hot-pressed laminate can accommodate a smaller number of battery cells (compared to the technical solution of the present application), resulting in low efficiency of the formation process.

[0004] Based on this, it is urgent to invent a hot-pressed laminate to solve the above-mentioned technical problems. Utility Model Content

[0005] The technical problem to be solved by the utility model is how to make a hot pressing layer plate adapt to a plurality of battery cells. Aiming at the above problem, a hot pressing layer plate is provided.

[0006] The technical solution of the utility model to solve the above technical problems is to provide a hot pressing layer plate, including: the hot pressing layer plate is adapted to a variety of battery cells of different sizes, and each of the hot pressing layer plates includes:

[0007] Laminate body;

[0008] At least two formation charging plates, each with positive and negative contacts, are arranged on the layer plate body at intervals and separate multiple battery cell placement areas;

[0009] The adjusting mechanism is fixedly connected to the end of the formation charging plate and is used to adjust the height of the formation charging plate so that the battery cell tabs are in contact with the positive and negative contacts.

[0010] Furthermore, the number of the formation charging plates is three.

[0011] Furthermore, two first battery cells or four second battery cells are placed in the two battery cell placement areas.

[0012] Preferably, each of the hot-pressed laminates further comprises a buffer for protecting the battery core during the forming pressurization process, and the buffer is coated on the laminate body.

[0013] Furthermore, the buffer component has a receiving groove for accommodating the layer plate body.

[0014] In one of the embodiments, a heating element is provided between a surface of the layer plate body facing away from the battery core and an inner surface of the buffer element.

[0015] Preferably, the heating element is an epoxy resin heating plate.

[0016] Preferably, both ends of the layer plate body and one side close to the adjustment mechanism are equipped with tab strips.

[0017] Preferably, at least two temperature sensors are installed at the bottom of the layer plate body.

[0018] In one specific embodiment, a formation fixture is provided, comprising an adjustment column that penetrates multiple layers of the adjustment mechanism, and the adjustment mechanism adjusts the height of the formation charging plate through the adjustment column.

[0019] The beneficial effect of the utility model is that by arranging four battery cells, the number of battery cells placed is reduced to half, and larger-sized batteries are compatible, thereby improving the production efficiency in the battery cell formation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a hot-pressed laminate on which a first battery cell is placed in the utility model;

[0021] Figure 2 It is a schematic structural diagram of a hot-pressed laminate on which a second battery cell is placed in the utility model;

[0022] Figure 3 It is a front view of the hot pressing layer plate on which the second battery cell is placed in the utility model;

[0023] Figure 4 This utility model Figure 3 Cross-sectional view of the hot pressed laminate about AA.

[0024] Reference numerals:

[0025] 1- hot pressing layer; 10- layer body; 11- buffer; 110- receiving slot; 111- battery cell placement area; 12- heating element; 13- temperature sensor;

[0026] 14-Formation charging plate; 15-Regulation mechanism (regulation block); 2-First battery cell; 3-Second battery cell. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0028] refer to Figure 1 to Figure 4The utility model provides a hot-pressed laminate and a formation fixture thereof. After the battery cell is manufactured, it is necessary to activate the positive and negative electrode materials inside the battery cell by charging and discharging to improve the comprehensive performance of the battery cell. This process is called the formation of the battery cell. As one of the important processes in the battery cell manufacturing process, the quality of the formation affects the quality of the SEI film, which directly affects the cycle life of the battery cell and its electrochemical properties (including but not limited to stability, self-discharge and safety). In addition, long-term charging and discharging are required during the battery cell formation process. In the aforementioned process, not only the charging and discharging voltage and current need to be accurately controlled, but also the pulse waveforms of the charging and discharging voltage and current need to be accurately controlled to prevent the SEI film impedance from increasing, thereby affecting the rate discharge performance of the lithium-ion battery and the production efficiency during the battery cell formation process.

[0029] With reference to the above, in order to improve the production efficiency in the battery cell formation process, it is necessary to place multiple battery cells in a single layer of a formation fixture (that is, between adjacent formation fixtures), and the existing formation fixtures usually adopt a vertical placement method. Although four or more battery cells can be placed, they are not suitable for larger-sized battery cells (compared to existing battery cells). Based on this, the technical solution of the utility model has been developed and designed.

[0030] Implementation Method 1

[0031] Continue to refer Figure 1 to Figure 4 The utility model provides a hot-pressed laminate 1 that can adapt to a variety of battery cells of different sizes (here refers to width), and each hot-pressed laminate 1 includes: a laminate body 10 with a certain hardness and a supporting role, and at least two formation charging plates 14 each having positive and negative contacts, and the formation charging plates 14 are arranged on the laminate body 10 at intervals and separate a plurality of battery cell placement areas 111. It should be noted that when the number of the formation charging plates 14 is multiple, two of the multiple are arranged at the two ends of the laminate body 10. When the number of the formation charging plates 14 is two, both are arranged at the two ends of the laminate body 10.

[0032] In addition, the hot-pressed laminate 1 also includes an adjustment mechanism 15, and the adjustment mechanism 15 is fixedly connected to the end of the formation charging plate 14 and is used to adjust the height of the formation charging plate 14 so that the battery cell pole ears are in contact with the positive and negative contacts on the corresponding formation charging plate 14. Specifically, the battery cell pole ears of different widths are in contact with the positive and negative contacts on the corresponding formation charging plate 14 to achieve adaptation to a variety of different sizes of battery cells. More specifically, large-sized battery cells. It should be noted that the number of adjustment mechanisms 15 is adapted to the number of formation charging plates 14.

[0033] Implementation Method 2

[0034] The difference between this embodiment and embodiment 1 is that the number of formation charging plates 14 is three, that is, the formation charging plates 14 separate two battery placement areas on the layer plate body 10. Of course, in other specific embodiments, the number of formation charging plates 14 is not limited. And the other parts of this embodiment are the same as those in embodiment 1, and will not be repeated here.

[0035] Implementation 3

[0036] The difference between this embodiment and embodiment 2 is that: in connection with the technical problem to be solved by this technical solution, in order to improve the production efficiency in the battery cell formation process, referring to the above, two first battery cells 2 or four second battery cells 3 are placed in the two battery cell placement areas 111. In other words, the aforementioned arrangement of the heating layer plate can increase the formation speed of the second battery cell 3 by two times (compared to the formation speed of the first battery cell 2). In other words, each battery cell placement area 111 is arranged with a first battery cell 2 or two second battery cells 3. It is understandable that the model of the first battery cell 2 is different from the model of the second battery cell 3, specifically, the length value of the first battery cell 2 is different from the length value of the second battery cell 3. More specifically, the length of the two second battery cells 3 is equivalent to the length of one first battery cell 2. It should be noted that the battery cell placement area 111 is not limited to the aforementioned two types of battery cells.

[0037] In addition, the above two battery placement modes can be quickly switched to further improve the production efficiency during the battery cell formation process. The other parts of this embodiment are the same as those of Embodiment 2 and will not be described in detail here.

[0038] Implementation 4

[0039] The difference between this embodiment and embodiment 1 is that: due to the greater hardness of the heating element 12 and the layer plate body 10, in order to prevent the battery cell from being damaged during the heating and pressurizing process, each hot pressing layer plate 1 also includes a buffer 11 for protecting the battery cell during the forming pressurizing process, and the buffer 11 is coated on the layer plate body 10. In addition, the buffer 11 can also ensure that the battery cell always remains horizontal relative to the layer plate body 10 during the forming process. Specifically, the buffer 11 can be a silicone pad. And the other parts of this embodiment are the same as those of embodiment 1, which will not be repeated here.

[0040] Implementation method 5

[0041] The difference between this embodiment and embodiment 4 is that in order to ensure that the buffering effect of the buffer 11 is optimal, the buffer 11 has a receiving groove 110 for accommodating the layer plate body 10. Obviously, the heating element 12 is also placed in the receiving groove 110 (see below for details). The other parts of this embodiment are the same as those of embodiment 4 and will not be repeated here.

[0042] Implementation 6

[0043] The difference between this embodiment and embodiment 4 is that in order to heat the battery cell during the formation process, a heating element 12 is provided between the surface of the layer body 10 facing away from the battery cell and the inner surface of the buffer 11. Specifically, the heating element 12 can be a heating plate, which helps to improve the efficiency of heating the battery cell due to its large area. In other specific embodiments, the heating element 12 can also be other structures. The other parts of this embodiment are the same as those of embodiment 4 and will not be repeated here.

[0044] Implementation 7

[0045] The difference between this embodiment and embodiment 4 is that the heating element 12 can be an epoxy resin heating sheet. In order to ensure uniform heating of the battery cell during the formation process, heating wires are evenly arranged on the epoxy resin heating sheet. The other parts of this embodiment are the same as those of embodiment 4 and will not be described here.

[0046] Implementation 8

[0047] The difference between this embodiment and the first embodiment is that tab strips are installed at both ends of the layer plate body 10 and one side near the adjustment mechanism 15. The other parts of this embodiment are the same as those of the first embodiment and will not be described in detail.

[0048] Implementation method 9

[0049] The difference between this embodiment and embodiment 1 is that, in order to ensure accurate temperature control during the formation process, at least two temperature sensors 13 are installed at the bottom of the layer body 10, one of which is used to sense the existing temperature value and convert it into a usable output signal, and the other is used for inspection, and an alarm is issued when the measured temperature value exceeds the preset temperature value. The other parts of this embodiment are the same as those of embodiment 1, and will not be repeated here.

[0050] Embodiment 10

[0051] The difference between this embodiment and the previous embodiment is that this embodiment provides a formation fixture, which includes an adjustment column that penetrates multiple layers of the adjustment mechanism 15, and the adjustment mechanism 15 adjusts the height of the formation charging plate 14 through the adjustment column to adapt to cells of different widths. The other parts of this embodiment are the same as the previous embodiment, and will not be repeated here.

[0052] The above are only preferred specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A hot pressed laminate, characterized in that: The hot-pressed laminate is adapted to various battery cells of different sizes, and each of the hot-pressed laminates comprises: Laminate body; At least two formation charging plates, each with positive and negative contacts, are arranged on the layer plate body at intervals and separate multiple battery cell placement areas; The adjusting mechanism is fixedly connected to the end of the formation charging plate and is used to adjust the height of the formation charging plate so that the battery cell tabs are in contact with the positive and negative contacts.

2. The hot pressed laminate according to claim 1, characterized in that: The number of the formation charging plates is three.

3. The hot pressed laminate according to claim 2, characterized in that: Two first battery cells or four second battery cells are placed in the two battery cell placement areas.

4. The hot pressed laminate according to claim 1, characterized in that: Each of the hot-pressed laminates further includes a buffer component for protecting the battery core during the formation and pressurization process, and the buffer component is coated on the laminate body.

5. The hot pressed laminate according to claim 4, characterized in that: The buffer component has a receiving groove for accommodating the layer plate body.

6. The hot pressed laminate according to claim 4, characterized in that: A heating element is arranged between the surface of the layer plate body on one side facing away from the battery core and the inner surface of the buffer element.

7. The hot pressed laminate according to claim 6, characterized in that: The heating element is an epoxy resin heating plate.

8. The hot pressed laminate according to claim 1, characterized in that: Both ends of the layer plate body and one side close to the adjustment mechanism are equipped with tab strips.

9. The hot pressed laminate according to claim 1, characterized in that: At least two temperature sensors are installed at the bottom of the layer plate body.

10. A formation fixture comprising a plurality of hot-pressed laminates as claimed in any one of claims 1 to 9, characterized in that: Also includes: An adjusting column runs through multiple layers of the adjusting mechanism, and the adjusting mechanism adjusts the height of the formation charging plate through the adjusting column.

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