In-situ battery device

Abstract

This application discloses an in-situ battery device, comprising a first housing, a second housing, and a battery body. The first housing has a window, the second housing is connected to the first housing, and the battery body is disposed between the first and second housings and seals the window. This application's technical solution uses the battery body itself to seal the window, eliminating the need for a beryllium window. This simplifies the structure, avoids the corrosion of the beryllium window by the electrolyte, ensures the sealing performance of the in-situ battery device, and helps improve the stability and accuracy of testing the in-situ battery device.

Description

Technical Field

[0001] This application relates to the field of battery measurement technology, and in particular to an in-situ battery device. Background Technology

[0002] In-situ battery devices are primarily used to monitor and study the phase transitions and structural evolution of electrode materials in real-time using in-situ XRD technology under actual working conditions. In related technologies, the window through which X-rays pass needs to be sealed with a beryllium window to isolate the environment. However, during testing, the electrolyte may come into contact with the beryllium window, causing corrosion. This can affect the sealing of the in-situ battery device, leading to electrolyte leakage or gas spillage. Utility Model Content

[0003] This application aims to at least partially solve one of the technical problems in the related art. To this end, this application proposes an in-situ battery device.

[0004] To achieve the above objectives, this application discloses an in-situ battery device, the in-situ battery device comprising:

[0005] The first casing has a window;

[0006] A second housing, connected to the first housing; and

[0007] The battery body is disposed between the first housing and the second housing and blocks the window.

[0008] In some embodiments of this application, the battery body includes a positive electrode, a separator layer, and a negative electrode, wherein the separator layer is disposed between the positive electrode and the negative electrode;

[0009] The positive electrode includes a positive current collector and a positive electrode material layer disposed on the positive current collector, and the positive current collector blocks the window.

[0010] In some embodiments of this application, the positive current collector is made of aluminum;

[0011] And / or, the thickness of the positive current collector is 16 μm to 30 μm;

[0012] And / or, the negative electrode is a lithium sheet.

[0013] In some embodiments of this application, a projection is made along the axial direction of the window, the projection of the window is located within the projection range of the positive current collector, and the projection outline of the window and the projection outline of the positive current collector are alternately arranged. The projection of the positive electrode material layer is located within the projection range of the window, and the projection outline of the positive electrode material layer and the projection outline of the window are alternately arranged.

[0014] In some embodiments of this application, a projection is made along the axial direction of the window, the projection of the positive electrode material layer is located within the projection range of the negative electrode sheet, and the projection outline of the positive electrode material layer and the projection outline of the negative electrode sheet are arranged alternately.

[0015] In some embodiments of this application, a projection is made along the axial direction of the window, the projection of the negative electrode sheet is located within the projection range of the separator layer, and the projection outline of the negative electrode sheet and the projection outline of the separator layer are alternately arranged. The projection of the separator layer is located within the projection range of the window, and the projection outline of the separator layer and the projection outline of the window are alternately arranged.

[0016] In some embodiments of this application, the in-situ battery device further includes a first insulating member, the first insulating member having a through hole, one end of the first insulating member abutting against the positive current collector to press the positive current collector against the first housing, the other end of the first insulating member abutting against the second housing, and projecting along the axial direction of the window, the projection of the positive electrode material layer is located within the projection range of the through hole, and the projection outline of the positive electrode material layer and the projection outline of the through hole are alternately arranged.

[0017] In some embodiments of this application, the in-situ battery device further includes a second insulating member, the second insulating member being made of ceramic, and the second insulating member being sleeved over the first insulating member.

[0018] In some embodiments of this application, the first insulating member has a conical structure, the second insulating member is sleeved on the first insulating member and abuts against the first insulating member, and the second insulating member also abuts against the second housing;

[0019] And / or, the first housing has a first groove on the side facing the second housing, the second housing has a second groove on the side facing the first housing, and the first insulating member and the second insulating member are disposed between the first groove and the second groove;

[0020] And / or, a sealing ring is provided between the first insulating element and the positive current collector;

[0021] And / or, a sealing ring is provided between the first insulating element and the second housing;

[0022] And / or, a sealing ring is provided between the second insulating element and the positive current collector or the first housing;

[0023] And / or, a sealing ring is provided between the second insulating element and the second housing.

[0024] In some embodiments of this application, the in-situ battery device further includes an elastic member disposed between the negative electrode and the second housing and located in the through hole, the elastic member being adapted to generate forces in opposite directions on the negative electrode and the second housing.

[0025] In some embodiments of this application, the elastic component includes a gasket and a spring, the gasket abutting against the negative electrode plate, one end of the spring abutting against the gasket, and the other end abutting against the second housing.

[0026] In some embodiments of this application, the sum of the natural thicknesses of the elastic component, the positive electrode, the separator layer, and the negative electrode when not subjected to external force is L1, and the sum of the thicknesses of the elastic component, the positive electrode, the separator layer, and the negative electrode after assembly between the first housing and the second housing is L2, and the ratio of L2 to L1 is X, satisfying 67%. <X<100%。

[0027] In some embodiments of this application, the battery body includes a positive electrode, a separator layer, and a negative electrode. The separator layer is disposed between the positive electrode and the negative electrode, and the separator layer includes a separator and absorbent paper stacked together.

[0028] In some embodiments of this application, the diaphragm and the absorbent paper are arranged sequentially from the positive electrode to the negative electrode.

[0029] And / or, the diameter of the diaphragm is larger than the diameter of the absorbent paper, and the diameter of the absorbent paper is larger than the diameter of the negative electrode plate.

[0030] In some embodiments of this application, the first housing and the second housing are electrically conductive;

[0031] And / or, the first housing is provided with a first connector, the second housing is provided with a second connector, and the first connector and the second connector are adapted for inserting wires;

[0032] And / or, the first housing and the second housing are detachably connected.

[0033] The technical solution of this application uses the battery body to seal the window, that is, to seal the window using the battery body's own structure, eliminating the need for a beryllium window. This simplifies the structure, avoids the situation where the beryllium window is corroded by the electrolyte, ensures the sealing of the in-situ battery device, and helps improve the stability and accuracy of testing the in-situ battery device.

[0034] Other advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice of this application. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other designs can be obtained based on the structures shown in these drawings without creative effort.

[0036] Figure 1 Cross-sectional views of the in-situ battery device in some embodiments;

[0037] Figure 2 This is a schematic diagram of the projected outline of the positive current collector, positive electrode material layer, separator layer, negative electrode sheet and window along the axial direction of the window in some embodiments.

[0038] Figure 3 This is a cross-sectional view of the partition layer in some embodiments.

[0039] Explanation of icon numbers:

[0040] First housing 110, window 111, first groove 112, first connector 113, second housing 120, second groove 121, second connector 122, battery body 200, positive electrode 210, positive current collector 211, positive electrode material layer 212, negative electrode 220, separator layer 230, diaphragm 231, absorbent paper 232, elastic component 300, gasket 310, spring 320, first insulating component 410, through hole 411, second insulating component 420.

[0041] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0043] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0044] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0046] This application discloses an in-situ battery device, which, in some embodiments, combines... Figure 1 As shown, the in-situ battery device includes a first housing 110, a second housing 120 and a battery body 200. The first housing 110 is provided with a window 111. The second housing 120 is connected to the first housing 110. The battery body 200 is located between the first housing 110 and the second housing 120 and blocks the window 111.

[0047] An in-situ battery device is not a specific battery product, but rather an experimental apparatus or technical means used for scientific research and technological development. Its main purpose is to monitor and study the phase transitions and structural evolution of electrode materials in real-time using in-situ XRD technology under actual working conditions. The in-situ battery device includes a first housing 110, a second housing 120, and a battery body 200. The first housing 110 and the second housing 120 are connected and fixed to form a support frame for the in-situ battery device, clamping and compressing the battery body 200 and other components placed inside. Typically, the first housing 110 and the second housing 120 are electrically conductive; for example, they may be made of stainless steel. During testing, the battery body 200 can be charged and discharged through connecting wires between the first housing 110 and the second housing 120. Of course, other methods can also be used to charge and discharge the battery body 200.

[0048] In related technologies, the first housing 110 is provided with a window 111, and a beryllium window (also known as a beryllium plate) is used to seal the window 111. The beryllium window serves to isolate the environment. However, during the testing of the in-situ battery device, the electrolyte may leak and come into contact with the beryllium window, causing corrosion of the beryllium window. This will affect the sealing performance of the in-situ battery device, leading to electrolyte leakage or gas overflow.

[0049] Therefore, in this embodiment, the battery body 200 is directly used to seal the window 111, thus eliminating the need for a beryllium window. The battery body 200 seals the window 111 through its own structure. Since the battery body 200 contains electrolyte, its structure is designed with corrosion resistance in mind. Therefore, sealing the window 111 through the battery body 200's own structure eliminates concerns about electrolyte corrosion damaging the seal of the in-situ battery device, which helps improve the testing stability and accuracy of the in-situ battery device. Through in-situ XRD technology, X-rays pass through the window 111 and irradiate the interior of the battery body 200, thereby enabling dynamic analysis of the electrode materials.

[0050] Generally, the battery body 200 includes a positive electrode 210, a separator layer 230, and a negative electrode 220, with the separator layer 230 disposed between the positive electrode 210 and the negative electrode 220. The separator layer 230 isolates the positive electrode 210 and the negative electrode 220, preventing them from coming into contact and short-circuiting. An electrolyte also exists between the positive electrode 210 and the negative electrode 220, and the separator layer 230 forms an electrolyte channel to allow ions to pass through, thus ensuring the electrochemical reaction proceeds in conjunction with the positive electrode 210 and the negative electrode 220. Various types of separator layers 230 are available, and the appropriate type can be selected based on the specific requirements.

[0051] In some embodiments, combined with Figure 1 As shown, the positive electrode 210 includes a positive current collector 211 and a positive material layer 212. The positive material layer 212 is disposed on the positive current collector 211, and the positive current collector 211 blocks the window 111.

[0052] Specifically, the active material of the positive electrode material layer 212 includes, but is not limited to, one or more of lithium cobalt oxide, lithium nickel cobalt manganese oxide, and lithium iron phosphate. Generally, the positive electrode material layer 212 may also contain conductive agents, binders, solvents, etc. The positive electrode material layer 212 is coated on the side of the positive electrode current collector 211 facing the negative electrode plate 220 to form a thin film. The side of the positive electrode current collector 211 away from the negative electrode plate 220 seals the window 111 when the positive electrode current collector 211 is placed in the first housing 110. Since there is an electrolyte between the positive electrode plate 210 and the negative electrode plate 220, the positive electrode current collector 211 will come into contact with the electrolyte. The positive electrode current collector 211 can effectively avoid corrosion by the electrolyte. Based on this, the window 111 is sealed by the positive electrode current collector 211 without worrying about corrosion. Using in-situ XRD technology, X-rays pass through the window 111 and irradiate the positive electrode material layer 212, thereby realizing dynamic analysis of the positive electrode material layer 212.

[0053] In some embodiments, the positive current collector 211 is made of aluminum, for example, aluminum foil. Aluminum foil has good conductivity and mechanical strength, can efficiently collect and conduct current, and has good corrosion resistance to avoid corrosion by electrolyte. The negative electrode 220 can be made of lithium sheet.

[0054] When the wavelength is constant, the larger the atomic number of a substance, the stronger its absorption of the wave. In this embodiment, aluminum foil is used as the positive electrode current collector 211 to block the window 111, which can reduce the absorption of X-rays. The intensity of X-rays passing through the positive electrode current collector 211 is higher (compared to the case of setting a beryllium window). This makes the diffraction signal clearer and more accurate in identifying and analyzing the crystal structure changes of the positive electrode material layer 212. In addition, the higher intensity X-rays help to shorten the test time and achieve rapid data acquisition.

[0055] In some embodiments, the thickness of the positive electrode current collector 211 is 16 μm to 30 μm, for example, the thickness of the positive electrode current collector 211 is 16 μm, 20 μm, 25 μm or 30 μm. If the thickness of the positive electrode current collector 211 is too large, it will have too much interference with the test results. If the thickness of the positive electrode current collector 211 is too small, the mechanical strength will be insufficient, it will be easy to break and it will be difficult to support the positive electrode material layer 212, which will also affect the test results. In this embodiment, by optimizing the thickness of the positive electrode current collector 211, both support performance and interference resistance are taken into account.

[0056] In some embodiments, combined with Figure 1 and Figure 2As shown, a projection is made along the axial direction of window 111. The projection of window 111 is within the projection range of positive current collector 211, and the projection outline of window 111 and the projection outline of positive current collector 211 are arranged alternately. The projection of positive electrode material layer 212 is within the projection range of window 111, and the projection outline of positive electrode material layer 212 and the projection outline of window 111 are arranged alternately.

[0057] The following explanation will be based on the example where the window 111, the positive current collector 211, and the positive electrode material layer 212 are all circular.

[0058] The projection of window 111 is located within the projection range of positive current collector 211, and the projection outline of window 111 and the projection outline of positive current collector 211 are alternately arranged, that is, the diameter of window 111 is smaller than the diameter of positive current collector 211. The projection of positive electrode material layer 212 is located within the projection range of window 111, and the projection outline of positive electrode material layer 212 and the projection outline of window 111 are alternately arranged, that is, the diameter of positive electrode material layer 212 is smaller than the diameter of window 111.

[0059] The diameter of the positive current collector 211 is larger than the diameter of the window 111. The positive current collector 211 can abut against the side of the first housing 110 facing the second housing 120. The larger area of ​​the positive current collector 211 makes it easier to cover the window 111. After the in-situ battery device is assembled, the periphery of the positive current collector 211 can be pressed against and sealed, thereby achieving the sealing of the window 111.

[0060] As described above, X-rays pass through window 111 and irradiate the cathode material layer 212 to analyze the changes in the cathode material layer 212. The diameter of window 111 is larger than the diameter of cathode material layer 212, so that X-rays can irradiate the entire cathode material layer 212, ensuring that the test results reflect the entire cathode material layer 212, and the test results are more complete and representative.

[0061] In some embodiments, combined with Figure 1 and Figure 2 As shown, when projected along the axial direction of window 111, the projection of the positive electrode material layer 212 is located within the projection range of the negative electrode sheet 220, and the projection outlines of the positive electrode material layer 212 and the negative electrode sheet 220 are arranged alternately.

[0062] The following explanation uses the example where both the positive electrode material layer 212 and the negative electrode sheet 220 are circular.

[0063] The projection of the positive electrode material layer 212 is located within the projection range of the negative electrode sheet 220, and the projection outlines of the positive electrode material layer 212 and the negative electrode sheet 220 are alternately arranged, meaning the diameter of the positive electrode material layer 212 is smaller than the diameter of the negative electrode sheet 220. This arrangement avoids interference signals generated by edge reactions of the negative electrode sheet 220, ensuring the measurement of the specific capacity of the positive electrode material layer 212 and improving the accuracy of the test results.

[0064] In some embodiments, combined with Figure 1 and Figure 2 As shown, when projected along the axial direction of window 111, the projection of negative electrode 220 is located within the projection range of separator 230, and the projection outline of negative electrode 220 and the projection outline of separator 230 are alternately arranged. The projection of separator 230 is located within the projection range of window 111, and the projection outline of separator 230 and the projection outline of window 111 are alternately arranged.

[0065] The following explanation uses the example where window 111, separator layer 230, and negative electrode sheet 220 are all circular.

[0066] The projection of the negative electrode 220 lies within the projection area of ​​the separator layer 230, and the projection outlines of the negative electrode 220 and the separator layer 230 are alternately arranged, meaning the diameter of the negative electrode 220 is smaller than the diameter of the separator layer 230. This arrangement allows the separator layer 230 to more effectively isolate the positive electrode 210 and the negative electrode 220. The projection of the separator layer 230 lies within the projection area of ​​the window 111, and the projection outlines of the separator layer 230 and the window 111 are alternately arranged, meaning the diameter of the separator layer 230 is smaller than the diameter of the window 111. This arrangement ensures successful installation (the separator layer 230 is located in the through hole 411 of the first insulating member 410).

[0067] In some embodiments, combined with Figure 1 As shown, the in-situ battery device also includes a first insulating member 410. The first insulating member 410 is provided with a through hole 411. One end of the first insulating member 410 abuts against the positive current collector 211 to press the positive current collector 211 against the first housing 110. The other end of the first insulating member 410 abuts against the second housing 120. Projecting along the axial direction of the window 111, the projection of the positive electrode material layer 212 is located within the projection range of the through hole 411, and the projection outline of the positive electrode material layer 212 and the projection outline of the through hole 411 are arranged alternately.

[0068] Provided that the first housing 110 and the second housing 120 are conductive, the first insulating member 410 serves to support the first housing 110 and the second housing 120, preventing short circuits caused by contact between the first housing 110 and the second housing 120. The material of the first insulating member 410 can be varied, for example, it can be made of PEEK (polyetheretherketone). When assembling the in-situ battery device, the positive electrode 210 needs to be placed on the first housing 110 first so that the positive current collector 211 covers the window 111. Then, the first insulating member 410 is placed on the positive current collector 211 to press and fix the positive electrode 210. Finally, when the first housing 110 and the second housing 120 are connected, the positive electrode 210 can seal the window 111. Projecting along the axial direction of window 111, the projection of the positive electrode material layer 212 is located within the projection range of the through hole 411, and the projection outline of the positive electrode material layer 212 and the projection outline of the through hole 411 are alternately arranged, that is, the diameter of the positive electrode material layer 212 is smaller than the aperture of the through hole 411, ensuring that X-rays can irradiate the entire positive electrode material layer 212 and ensuring the accuracy of the test results.

[0069] In some embodiments, combined with Figure 1 As shown, the in-situ battery device also includes a second insulating component 420, which is made of ceramic. The second insulating component 420 is fitted over the first insulating component 410. The ceramic material of the second insulating component 420 is more resistant to high temperatures. The fitting of the second insulating component 420 over the first insulating component 410 helps to improve the durability of the in-situ battery device and also allows for high-temperature testing to meet different usage requirements.

[0070] In some embodiments, combined with Figure 1 As shown, the first insulating member 410 has a conical structure, the second insulating member 420 is sleeved on the first insulating member 410 and abuts against the first insulating member 410, and the second insulating member 420 also abuts against the second housing 120.

[0071] See Figure 1 As shown, the outer wall of the first insulating member 410 gradually tapers from the end near the first housing 110 to the end near the second housing 120, thus forming a conical structure. The second insulating member 420 has a conical cavity that matches the conical structure of the first insulating member 410. The second insulating member 420 is fitted onto the first insulating member 410 through its conical cavity. During the process of fitting the second insulating member 420 onto the first insulating member 410, it gradually comes into contact with the first insulating member 410. When the in-situ battery device is assembled, the end of the second insulating member 420 near the second housing 120 is abutted by the second housing 120. The cooperation of the first housing 110 and the second housing 120 achieves the pressing of the first insulating member 410 and the second insulating member 420.

[0072] In some embodiments, combined with Figure 1 As shown, the first housing 110 has a first groove 112 on the side facing the second housing 120, and the second housing 120 has a second groove 121 on the side facing the first housing 110. The first insulating member 410 and the second insulating member 420 are disposed between the first groove 112 and the second groove 121.

[0073] The orientation of the first housing 110 and the second housing 120 towards each other is defined as the first direction, which is the axial direction of the window 111 and also the axial direction of the in-situ battery device. When the first housing 110 and the second housing 120 are connected and fixed, the first insulating member 410 and the second insulating member 420 are clamped in the axial direction. In this embodiment, by setting the first groove 112 and the second groove 121, the first insulating member 410 and the second insulating member 420 are disposed between the first groove 112 and the second groove 121. This can limit the first insulating member 410 and the second insulating member 420 in the radial direction, and minimize the displacement of the first insulating member 410 and the second insulating member 420 during the assembly of the in-situ battery device, thereby avoiding misalignment between the parts and helping to improve the accuracy of the test results. See, for example. Figure 1 In the illustrated scheme, during assembly, the bottom ends of the first insulating member 410 and the second insulating member 420 are placed into the first groove 112, and when the second housing 120 is closed, the second groove 121 is aligned with the top ends of the first insulating member 410 and the second insulating member 420 and fitted onto them.

[0074] In some embodiments, a sealing ring is provided between the first insulating member 410 and the positive current collector 211. By providing the sealing ring, the sealing performance of the in-situ battery device is improved. Similarly, a sealing ring can also be provided between the first insulating member 410 and the second housing 120, and a sealing ring can be provided between the second insulating member 420 and the positive current collector 211 or the first housing 110, and a sealing ring can also be provided between the second insulating member 420 and the second housing 120. When the first insulating member 410 has a conical structure, the second insulating member 420 can be fitted over the first insulating member 410 without contacting the first housing 110, thus eliminating the need for a sealing ring between the second insulating member 420 and the first housing 110.

[0075] In some embodiments, combined with Figure 1As shown, the in-situ battery device further includes an elastic member 300. The elastic member 300 is disposed between the negative electrode sheet 220 and the second housing 120 and is located in the through hole 411. The elastic member 300 is adapted to generate forces in opposite directions on the negative electrode sheet 220 and the second housing 120. That is, after the in-situ battery device is assembled, the elastic member 300 generates an elastic force. The direction of the force generated by the elastic member 300 on the second housing 120 is opposite to the direction of the force generated on the negative electrode sheet 220. Thus, the setting of the elastic member 300 plays a buffering and compaction role for the battery body 200.

[0076] For example, the battery body 200 seals the sealing window 111 by the positive electrode current collector 211 of its positive electrode sheet 210 against one side of the first housing 110 facing the second housing 120. The elastic member 300 is placed on the negative electrode sheet 220. During the connection process of the first housing 110 and the second housing 120, the first housing 110 and the second housing 120 cooperate to squeeze the elastic member 300 together. The elastic member 300 elastically deforms to generate a force. Through the setting of the elastic member 300, the force generated by the first housing 110 and the second housing 120 is prevented from directly acting on the battery body 200. The elastic member 300 plays a buffering role to prevent the battery body 200 from cracking. The elastic force generated by the elastic member 300 is applied to the negative electrode sheet 220, and then the positive electrode sheet 210, the separator layer 230, and the negative electrode sheet 220 are compacted.

[0077] Optionally, as shown in Figure 1 The elastic member 300 includes a gasket 310 and a spring 320. The gasket 310 abuts against the negative electrode sheet 220. One end of the spring 320 abuts against the gasket 310, and the other end abuts against the second housing 120. By providing the gasket 310, the contact area with the negative electrode sheet 220 is increased, so that the force generated by the spring 320 is applied to the battery body 200 more evenly. It can not only prevent the force generated by the spring 320 from causing the battery body 200 to crack, but also make the battery body 200 form a more uniform compaction effect, improving the yield of the in-situ battery device.

[0078] It can be understood that if the battery body 200 is not compacted enough, the contact internal resistance will increase, and the active material reaction will be insufficient, resulting in a decline in electrical performance. If the battery body 200 is compacted too much, the battery body 200 is easily damaged and the electrolyte flows out. Therefore, in some embodiments, the sum of the natural thicknesses of the elastic member 300, the positive electrode sheet 210, the separator layer 230, and the negative electrode sheet 220 when not under external force is L1, and the sum of the thicknesses of the elastic member 300, the positive electrode sheet 210, the separator layer 230, and the negative electrode sheet 220 after being assembled between the first housing 110 and the second housing 120 is L2. The ratio of L2 to L1 is X, satisfying 67% < X < 100%. Thus, the compaction degree of the battery body 200 is moderate, and the electrical performance and cycle data are better.

[0079] Generally, the separator 230 can be used solely for the separator 231 to separate the positive electrode 210 and the negative electrode 220 while allowing ions to pass through. The separator 231 is often made of porous polymers (such as polyethylene or polypropylene). If the in-situ battery device uses only the separator 231, the electrolyte will leak quickly during hundreds of tests. Therefore, in some embodiments, a combination of... Figure 1 and Figure 3 As shown, the separator layer 230 includes a separator 231 and absorbent paper 232 stacked together. The absorbent paper 232 is mostly made of glass fiber or non-woven fabric. The absorbent paper 232 can also separate the positive electrode 210 and the negative electrode 220 and allow ions to pass through. The absorbent paper 232 is mainly used to absorb and fix the electrolyte, prevent leakage, and ensure that the electrolyte evenly wets the positive electrode 210 and / or the negative electrode 220. At the same time, the absorbent paper 232 can also buffer mechanical stress, alleviate the volume expansion / contraction of the electrodes during charging and discharging, maintain the structural stability of the battery body 200, and prevent the electrolyte from evaporating too quickly during multiple tests.

[0080] When assembling the battery body 200, the positive electrode 210 is placed on the side of the first housing 110 facing the second housing 120. Electrolyte is dripped onto the positive electrode material layer 212 to wet it. The separator 231 is then placed over the positive electrode material layer 212. The absorbent paper 232 is placed on the separator 231, and electrolyte is dripped onto the absorbent paper 232. Then, the negative electrode 220 is placed on the absorbent paper 232. By adding electrolyte in batches, it is ensured that the electrolyte evenly wets the positive electrode 210 and / or the negative electrode 220, which is more conducive to battery activation.

[0081] Optionally, the diameter of the separator 231 is larger than the diameter of the absorbent paper 232, and the diameter of the absorbent paper 232 is larger than the diameter of the negative electrode 220. This achieves edge coverage of the negative electrode 220 and prevents electrolyte leakage, ensuring uniform electrolyte distribution. For example, the diameter difference between the separator 231 and the absorbent paper 232 is 1mm to 2mm, and the diameter difference between the absorbent paper 232 and the negative electrode 220 is 2mm to 3mm. It can be understood that when the separator layer 230 includes the separator 231 and the absorbent paper 232, the diameter of the separator layer 230 is the maximum diameter, i.e., the diameter of the separator 231.

[0082] In some embodiments, the first housing 110 and the second housing 120 are electrically conductive. For example, the first housing 110 and the second housing 120 are made of stainless steel. During testing, the battery body 200 can be charged and discharged through the connecting wires of the first housing 110 and the second housing 120.

[0083] To facilitate charging and discharging, the first housing 110 is provided with a first connector 113, and the second housing 120 is provided with a second connector 122. The first connector 113 and the second connector 122 are suitable for inserting wires. Related in-situ battery devices require tabs to be provided on the first housing 110 and the second housing 120 respectively. These tabs are easily damaged and inconvenient for connecting to wires. This embodiment, by providing the first connector 113 and the second connector 122, allows wires to be inserted into both connectors, making assembly and disassembly convenient and less prone to damage.

[0084] In some embodiments, the first housing 110 and the second housing 120 are detachably connected for easy disassembly and cleaning. For example, the first housing 110 and the second housing 120 are connected and fixed by screws and wing nuts.

[0085] The following is a brief description of the assembly process of the in-situ battery device:

[0086] The positive electrode 210 is placed at the center of the side of the first housing 110 facing the second housing 120 so that the window 111 is covered by the positive current collector 211;

[0087] Electrolyte is added dropwise to the positive electrode material layer 212;

[0088] The separator 231 is placed at the center of the positive electrode material layer 212 to cover the positive electrode material layer 212;

[0089] Place the absorbent paper 232 in the center of the diaphragm 231 and add electrolyte to the absorbent paper 232;

[0090] Place the negative electrode 220 onto the absorbent paper 232;

[0091] The first insulating element 410 is placed on the positive electrode 210 to press and fix the positive electrode 210. The positive electrode material layer 212, the separator 231, the absorbent paper 232, and the negative electrode 220 are located within the outline of the through hole 411.

[0092] The second insulating element 420 is fitted onto the first insulating element 410;

[0093] Place the gasket 310 into the through hole 411 of the first insulating member 410 and abut against the negative electrode 220;

[0094] The spring 320 is placed into the through hole 411 of the first insulating member 410 and abuts against the gasket 310;

[0095] The second housing 120 is connected to the first housing 110, and the second housing 1200 abuts against the other end of the spring 320, thus completing the in-situ battery device assembly.

[0096] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural transformations made based on the concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. An in-situ battery device, characterized by, The in-situ battery device includes: The first housing (110) is provided with a window (111); The second housing (120) is connected to the first housing (110); and The battery body (200) is disposed between the first housing (110) and the second housing (120) and blocks the window (111).

2. The in situ battery apparatus of claim 1, wherein, The battery body (200) includes a positive electrode (210), a separator layer (230) and a negative electrode (220), wherein the separator layer (230) is disposed between the positive electrode (210) and the negative electrode (220); The positive electrode (210) includes a positive current collector (211) and a positive material layer (212) disposed on the positive current collector (211), and the positive current collector (211) blocks the window (111).

3. The in situ battery apparatus of claim 2, wherein, The positive current collector (211) is made of aluminum; And / or, the thickness of the positive current collector (211) is 16 μm to 30 μm; And / or, the negative electrode (220) is a lithium electrode.

4. The in situ battery apparatus of claim 2, wherein, Projecting along the axial direction of the window (111), the projection of the window (111) is located within the projection range of the positive current collector (211), and the projection outline of the window (111) and the projection outline of the positive current collector (211) are arranged alternately. The projection of the positive electrode material layer (212) is located within the projection range of the window (111), and the projection outline of the positive electrode material layer (212) and the projection outline of the window (111) are arranged alternately.

5. The in situ battery apparatus of claim 4, wherein, Projecting along the axial direction of the window (111), the projection of the positive electrode material layer (212) is located within the projection range of the negative electrode sheet (220), and the projection outline of the positive electrode material layer (212) and the projection outline of the negative electrode sheet (220) are arranged alternately.

6. The in situ battery apparatus of claim 5, wherein, Projecting along the axial direction of the window (111), the projection of the negative electrode sheet (220) is located within the projection range of the separator layer (230), and the projection outline of the negative electrode sheet (220) and the projection outline of the separator layer (230) are alternately arranged. The projection of the separator layer (230) is located within the projection range of the window (111), and the projection outline of the separator layer (230) and the projection outline of the window (111) are alternately arranged.

7. The in situ battery apparatus of claim 2, wherein, The in-situ battery device further includes a first insulating member (410), which has a through hole (411). One end of the first insulating member (410) abuts against the positive current collector (211) to press the positive current collector (211) against the first housing (110). The other end of the first insulating member (410) abuts against the second housing (120). The projection of the positive electrode material layer (212) is located within the projection range of the through hole (411) along the axial direction of the window (111), and the projection outline of the positive electrode material layer (212) and the projection outline of the through hole (411) are alternately arranged.

8. The in situ battery apparatus of claim 7, wherein, The in-situ battery device further includes a second insulating member (420), which is made of ceramic and is fitted over the first insulating member (410).

9. The in situ battery apparatus of claim 8, wherein, The first insulating member (410) has a conical structure, the second insulating member (420) is sleeved on the first insulating member (410) and abuts against the first insulating member (410), and the second insulating member (420) also abuts against the second housing (120); And / or, the first housing (110) has a first groove (112) on the side facing the second housing (120), the second housing (120) has a second groove (121) on the side facing the first housing (110), and the first insulating member (410) and the second insulating member (420) are disposed between the first groove (112) and the second groove (121); And / or, a sealing ring is provided between the first insulating member (410) and the positive current collector (211); And / or, a sealing ring is provided between the first insulating member (410) and the second housing (120); And / or, a sealing ring is provided between the second insulating member (420) and the positive current collector (211) or the first housing (110); And / or, a sealing ring is provided between the second insulating element (420) and the second housing (120).

10. The in situ battery apparatus of claim 7, wherein, The in-situ battery device further includes an elastic member (300) disposed between the negative electrode plate (220) and the second housing (120) and located in the through hole (411). The elastic member (300) is adapted to generate forces in opposite directions on the negative electrode plate (220) and the second housing (120).

11. The in-situ battery device as claimed in claim 10, characterized in that, The sum of the natural thicknesses of the elastic component (300), the positive electrode (210), the separator layer (230), and the negative electrode (220) when not subjected to external force is L1. The sum of the thicknesses of the elastic component (300), the positive electrode (210), the separator layer (230), and the negative electrode (220) after assembly between the first housing (110) and the second housing (120) is L2. The ratio of L2 to L1 is X, which satisfies 67%. <X<100%。 12. The in situ battery apparatus of claim 1, wherein, The first housing (110) and the second housing (120) are electrically conductive; And / or, the first housing (110) is provided with a first connector (113), and the second housing (120) is provided with a second connector (122), the first connector (113) and the second connector (122) being adapted for inserting wires; And / or, the first housing (110) and the second housing (120) are detachably connected.

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