A battery grid, a bipolar battery grid, and a pole plate, a pole plate group

Abstract

The utility model relates to the technical field of battery, specifically disclose a battery is with grid, bipolar battery grid and polar plate, polar plate group. The grid contains the containing assembly in it has the insulating substrate, the insulating frame that surrounds the insulating substrate layout, the insulating substrate and the insulating frame are enclosed and constitute the containing chamber, wherein the insulating substrate is provided with a plurality of mounting through -holes, the containing chamber is provided with a plurality of the conductive grid needle of mounting on mounting through -hole, each conductive grid needle contains the first conductive end that passes through or inserts in the chamber of mounting through -hole and the second conductive end that is away from the insulating substrate. Through the simplification of the structure of the conductive body in the grid needle, the mass ratio of the conductive member in the polar plate grid can be reduced, so that the volume of the containing chamber containing positive and negative active materials is increased under the premise of ensuring the conductive function of the polar plate grid, and the mass ratio of the positive and negative active materials in the polar plate is further increased after the composition of the polar plate.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a grid with a housing component for accommodating positive and negative electrode active materials, a bipolar battery grid, electrode plates, and electrode plate assembly processed based on the grid. Background Technology

[0002] With the rapid development of society and technology, storage batteries have been widely used and developed in many fields, giving rise to various types. Researching storage batteries with high specific energy and long service life has always been one of the research hotspots in this field. Since the positive and negative electrode active materials are the carriers of electrochemical reactions, they directly determine the energy storage capacity of the battery. Therefore, increasing the mass ratio of positive and negative electrode active materials in batteries of the same capacity is a common method for improving storage batteries.

[0003] Bipolar batteries represent an innovative design based on the traditional unipolar battery structure. These batteries typically consist of several sets of plates, eliminating the need for separate casings and connectors between traditional battery cells, thus reducing internal resistance and improving space utilization. The development and use of this type of battery overcomes the limitations of traditional unipolar batteries in terms of high power, high energy density, and compactness.

[0004] For example, patent application number 201820431661.3 discloses a bipolar electrode grid, including an insulating substrate with receiving grooves on both sides. A conductive lead plate is disposed in one of the receiving grooves, and the conductive lead plate has a protrusion penetrating the insulating substrate. The insulating substrate has a through hole for the protrusion to pass through. The bottom surface of the receiving groove on the side with the conductive lead plate has a glue groove surrounding a single through hole. The receiving grooves of this type of bipolar electrode grid can respectively accommodate positive and negative electrode active materials.

[0005] However, the single-plate grid in this patent still contains structurally complex conductive lead plates and other components, which reduces the coating space for positive and negative electrode active materials in the plate grid. Consequently, the specific energy and other performance of the bipolar battery made using this plate grid still have considerable room for improvement. Utility Model Content

[0006] This invention provides a battery grid that, while ensuring the grid's conductivity, reduces the mass of the conductor supporting the positive and negative electrode active materials, thereby enabling a battery of the same capacity to carry more positive and negative electrode active materials and improving the battery's specific energy.

[0007] This utility model is achieved through the following technical solution:

[0008] A battery grid includes a housing assembly, which includes an insulating substrate and an insulating frame arranged around the insulating substrate. The insulating substrate and the insulating frame together form a housing cavity. The insulating substrate has a plurality of mounting through holes, and the housing cavity has a plurality of conductive grid pins mounted on the mounting through holes. Each conductive grid pin includes a first conductive end that passes through or is inserted into the cavity of the mounting through hole and a second conductive end that is away from the insulating substrate.

[0009] As a further improvement of this utility model, the receiving chamber contacts the insulating frame through the first limiting surface, and a limiting part of the conductive edge grid is provided on the first limiting surface; the conductive edge grid also includes a connecting part, which is used to form an electrical connection between the limiting part and the adjacent conductive grid pin.

[0010] As a further improvement of this utility model, the receiving chamber contacts the insulating substrate through the second limiting surface, and the connecting part is disposed on the second limiting surface.

[0011] As a further improvement of this utility model, a limiting ring block is formed on the conductive grid pin, so that when the conductive grid pin is mounted on the insulating substrate, the limiting ring block covers the mounting through hole.

[0012] Secondly, this utility model provides a bipolar battery intermediate grid, which includes two sets of receiving components in any of the above-mentioned battery grids. The two sets of receiving components share a set of insulating substrates. Insulating frames and conductive grid pins are respectively arranged on both sides of the insulating substrates, wherein the two sets of conductive grid pins installed in the same mounting through hole form an electrical connection.

[0013] Thirdly, this utility model provides a bipolar battery intermediate plate, which is made using the aforementioned bipolar battery intermediate plate grid. Typically, positive and negative active materials are coated respectively within the two sets of receiving components of the bipolar battery intermediate plate grid to obtain the bipolar battery intermediate plate.

[0014] Fourthly, this utility model provides a bipolar battery positive and negative electrode grid, which includes a set of housing components, a conductive busbar, and electrode ears electrically connected to the conductive busbar in any of the above-mentioned battery grids, wherein the first conductive ends of a plurality of conductive grid pins are electrically connected to the conductive busbar.

[0015] Fifthly, this utility model provides a bipolar battery positive and negative electrode plate, which is made using the aforementioned bipolar battery positive and negative electrode plate grid. A positive electrode active material is coated within the receiving component of the bipolar battery positive and negative electrode plate grid to obtain the bipolar battery positive electrode plate; a negative electrode active material is coated within the receiving component of the bipolar battery positive and negative electrode plate grid to obtain the bipolar battery negative electrode plate.

[0016] Sixthly, this utility model provides a bipolar battery electrode assembly, which includes at least one bipolar battery intermediate electrode and two bipolar battery positive and negative electrode plates, with a plurality of bipolar battery intermediate electrode plates stacked between two bipolar battery positive and negative electrode plates.

[0017] The beneficial effects of this utility model include:

[0018] (1) By simplifying the structure of the conductors, including the grid pins, the mass ratio of the conductive components in the grid of the electrode plate can be reduced. Under the premise of ensuring that the grid of the electrode plate has the function of conducting electricity, the volume of the cavity for accommodating the positive and negative electrode active materials can be increased. Therefore, after the grid of the electrode plate is coated with positive and negative electrode active materials and the battery electrode plate group is formed, the mass ratio of the positive and negative electrode active materials in the electrode plate group is relatively high, and the specific energy of the battery is further improved.

[0019] (2) In this utility model, an insulating frame or the like is used to enclose and form a receiving chamber, and a three-dimensional active material layer can be placed in the receiving chamber, which increases the active material content per unit area and improves the mass ratio of positive and negative electrode active materials in the battery. At the same time, several sets of conductive grid pins are set in the receiving chamber. After the active material layer is placed, the conductive grid pins are inserted into the active material layer. On the one hand, the conductive grid pins can act as an anchoring structure in the active material layer to prevent the active material from falling out of the receiving chamber after long-term use of the battery. On the other hand, the conductive grid pins establish a vertical conductive skeleton in the active material layer, shortening the electron transport path in the active material layer and further ensuring that all active materials can participate in the electrochemical reaction.

[0020] (3) By arranging conductive grids around the containment chamber, on the one hand, the electrical connection between the conductive grids and the adjacent grid pins enables the positive and negative electrode active materials placed between them to participate in the reaction without being wasted; on the other hand, after long-term use of the battery, the positive electrode active material is prone to expansion, while the conductive grids arranged around the containment chamber can restrict and compress the active material inside. Under this structure, the expansion of the active material promotes its close contact with the conductive grids, ensuring that the active material fully participates in the electrochemical reaction. Attached Figure Description

[0021] The following figures are provided in conjunction with preferred embodiments of the present invention to aid in understanding the purpose and advantages of the present invention, wherein:

[0022] Figure 1 This is a schematic diagram of the positive and negative electrode grid structure of a bipolar battery from a first-view perspective.

[0023] Figure 2 This is a front view schematic diagram of the positive and negative electrode grid structure of a bipolar battery;

[0024] Figure 3 This is a side view of the positive and negative electrode grid structure of a bipolar battery.

[0025] Figure 4 for Figure 2 Cross-sectional view of the positive and negative electrode grids at point A-A' in a bipolar battery;

[0026] Figure 5 This is a schematic diagram of the second-view structure of the intermediate grid of a bipolar battery.

[0027] Figure 6 A schematic diagram of the front view of the grid structure of the intermediate plate of a bipolar battery;

[0028] Figure 7 for Figure 6 Cross-sectional view of the grid at B-B' in the middle of the bipolar cell. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0030] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0031] Example 1:

[0032] In this embodiment, a bipolar battery positive and negative electrode grid is provided, such as... Figures 1-4 As shown, it includes a housing component, a conductive busbar 6, and an electrode ear 7 electrically connected to the conductive busbar 6.

[0033] like Figure 1 , 2 As shown in Figure 4, the receiving component includes an insulating substrate 1, an insulating frame 2 arranged around the insulating substrate 1, and several sets of conductive pins 4. Exemplarily, in this embodiment, the insulating substrate 1 has a rectangular structure, therefore the insulating frame 2 is arranged around the insulating substrate 1, and the remaining insulating substrates 1 together form a cuboid receiving cavity 3. N sets of conductive pins 4 (N is a natural number) are arranged within the receiving cavity 3. Wherein, as... Figure 4As shown, N (N is a natural number) sets of mounting through holes 101 are formed on the insulating substrate 1. A set of conductive pins 4 are installed in each set of mounting through holes 101. The first conductive end 401 of the conductive pin 4 is placed in the mounting through hole 101, while the other end, namely the second conductive end 402, is away from the insulating substrate 1. In this structure, the three-dimensional positive and negative electrode active material layers can be placed in the receiving chamber 3 enclosed by the insulating frame 2, and the conductive pins 4 can be inserted into the positive and negative electrode active material layers to form a vertical conductive framework, ensuring that the part of the positive and negative electrode active material layers away from the insulating substrate 1 can also fully participate in the electrochemical reaction. In terms of the physical connection method of each component, the insulating substrate 1 and the insulating frame 2 can be an integrally formed structure, or they can be bonded using an adhesive.

[0034] like Figures 3-4 As shown, the conductive busbar 6 is electrically connected to the first conductive end 401 on the conductive grid pin 4, and simultaneously, the conductive busbar 6 is electrically connected to the electrode ear 7. Regarding the physical connection between the components, the electrode ear 7 and the conductive busbar 6 can be an integrally formed structure or connected by welding or other methods; the conductive grid pin 4 and the conductive busbar 6 can be connected by welding or other methods. Welding or integral forming processes can reduce the direct fusion of metal atoms in the conductive components, significantly reducing the resistance between the conductive components, and ensuring full interface conductivity between the connected conductive components, resulting in a more uniform current density; simultaneously, the conductive busbar 6 and the insulating substrate 1 can be bonded together using an adhesive. In this structure, the conductive busbar 6 can receive electrons transferred from the electrode ear 7 and evenly distribute the electrons to each group of conductive grid pins 4; similarly, it can also receive and collect electrons collected from each group of conductive grid pins 4 and transfer them to the electrode ear 7.

[0035] Preferably, such as Figure 2 and 4 As shown, the receiving chamber 3 contacts the insulating frame 2 via a first limiting surface 301. A limiting portion 501 of a conductive edge grid 5 is provided on the first limiting surface 301. The conductive edge grid 5 also includes a connecting portion 502, which allows the limiting portion 501 to be electrically connected to an adjacent conductive grid pin 4. Preferably, as shown... Figure 1 and 3 As shown, the receiving chamber 3 contacts the insulating substrate 1 via the second limiting surface 302, and the connecting portion 502 is disposed on the second limiting surface 302. Regarding the physical connection between the various parts, the conductive edge grid 5 can be bonded to the insulating frame 2 using adhesive. In this structure, the conductive edge grid 5 can be electrically connected to the adjacent conductive pins 4, or the connection can be omitted.

[0036] For example, conductive components such as conductive grid pins 4 and conductive side grids 5 can be made of different metal materials depending on the battery type. For instance, lead or lead alloys are used in lead-acid batteries, while in lithium-ion batteries, the conductive grid pins in the positive electrode grid are made of aluminum, and the conductive grid pins 4 in the negative electrode grid are made of copper. Conductive components such as conductive busbars 6 and electrode ears 7 can be made of metal materials with good conductivity, such as copper, aluminum, or lead. Insulating substrate 1 and insulating frame 2 can be made of materials with good insulation and rigidity, such as epoxy resin, unsaturated resin, or bakelite.

[0037] Preferably, in this embodiment, the plurality of conductive grid pins 4 in the receiving chamber 3 are arranged in a horizontal arrangement group and a vertical arrangement group, wherein each horizontal arrangement group and the vertical arrangement group contains at least three conductive grid pins 4.

[0038] Preferably, such as Figure 2 and 4 As shown, a limiting ring block 403 is also formed on the conductive gate pin 4, so that when the conductive gate pin 4 is mounted on the insulating substrate 1, the limiting ring block 403 covers the mounting through hole 101. In the structure of this embodiment, the limiting ring block 403 can play the role of fixing the conductive gate pin 4.

[0039] Example 2:

[0040] The difference between this embodiment and Embodiment 1 is that this embodiment provides a bipolar battery intermediate grid, such as... Figures 5-7 As shown, it includes two sets of receiving components for the positive and negative electrode grids of the bipolar battery in Embodiment 1. The two sets of receiving components share a set of insulating substrate 1. Insulating frames 2 and conductive grid pins 4 are respectively arranged on both sides of the insulating substrate 1. At the same time, since the two sets of receiving components share a set of insulating substrate 1, two sets of conductive grid pins 4 are respectively arranged in the mounting through holes 101 opened on the insulating substrate 1, such as... Figure 7 As shown, the first conductive ends 401 of the two sets of conductive grid pins 4 are electrically connected, while their respective second conductive ends 402 are located away from the insulating substrate 1. In this structure, the two sides of the intermediate grid of the bipolar battery can respectively carry the positive electrode active material and the negative electrode active material, and the conductive grid pins 4 can realize the transfer of electrons between the two. In terms of the physical connection of each component, the two conductive grid pins 4 built into the same mounting through hole 101 can be integrally formed and fixed to the insulating substrate 1 by mechanical extrusion, or formed by welding two sets of independent conductive grid pins 4. The integral forming or welding connection of the two sets of conductive grid pins 4 can ensure that the resistance encountered when current flows between them is low, further reducing the energy loss of the battery made from this grid during high current charging and discharging.

[0041] Preferably, such as Figures 6-7As shown, the receiving chambers 3 on both sides of the insulating substrate 1 are in contact with the insulating frame 2 through the first limiting surface 301. Limiting portions 501 of conductive edge grids 5 are respectively provided on the first limiting surface 301 on both sides. Each conductive edge grid 5 also includes a connecting portion 502, which allows the limiting portion 501 to be electrically connected to the adjacent conductive grid pin 4. Preferably, the two sets of receiving chambers 3 are in contact with the insulating substrate 1 through the second limiting surface 302, and the two sets of connecting portions 502 are provided on the second limiting surface 302.

[0042] Preferably, such as Figure 5 and 7 As shown, a limiting ring block 403 is also formed on the conductive grid pin 4. In the structure of this embodiment, the limiting ring blocks 403 on both sides of the insulating substrate 1 can cover and seal the same mounting through hole 101 to complete the installation and fixation of the two sets of conductive grid pins 4 on the same mounting through hole 101.

[0043] Example 3:

[0044] This embodiment provides a bipolar battery electrode assembly, which includes two bipolar battery positive and negative electrode plates and at least one bipolar battery intermediate electrode plate placed between them.

[0045] The two bipolar positive and negative electrode plates include one positive electrode plate and one negative electrode plate. Both of them adopt the bipolar battery positive and negative electrode grids described in Example 1. The difference is that the positive electrode plate needs to have a positive active material placed inside the receiving chamber 3, while the negative electrode plate needs to have a negative active material placed inside the receiving chamber 3.

[0046] The intermediate plates of the bipolar batteries all adopt the bipolar battery intermediate plate grid described in Example 2. Positive electrode active material and negative electrode active material are respectively placed in the receiving chambers 3 on both sides of the bipolar battery intermediate plate grid.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery grid comprising a receiving assembly, wherein the receiving assembly includes an insulating substrate (1) and an insulating frame (2) arranged around the insulating substrate (1), the insulating substrate (1) and the insulating frame (2) together forming a receiving cavity (3), characterized in that, The insulating substrate (1) has a plurality of mounting through holes (101), and the receiving chamber (3) is provided with a plurality of conductive pins (4) mounted on the mounting through holes (101). Each conductive pin (4) includes a first conductive end (401) that passes through or is inserted into the chamber of the mounting through hole (101) and a second conductive end (402) that is away from the insulating substrate (1).

2. A battery grid according to claim 1, characterized in that, The receiving chamber (3) is in contact with the insulating frame (2) through the first limiting surface (301), and a limiting part (501) of the conductive side grid (5) is provided on the first limiting surface (301); the conductive side grid (5) also includes a connecting part (502), which is used to form an electrical connection between the limiting part (501) and the adjacent conductive grid pin (4).

3. A battery grid according to claim 2, characterized in that, The receiving chamber (3) is in contact with the insulating substrate (1) through the second limiting surface (302), and the connecting part (502) is disposed on the second limiting surface (302).

4. A battery grid according to claim 1, characterized in that, A limiting ring block (403) is formed on the conductive gate pin (4) so ​​that when the conductive gate pin (4) is mounted on the insulating substrate (1), the limiting ring block (403) covers the mounting through hole (101).

5. A bipolar battery intermediate grid, characterized in that, The battery grid includes two sets of receiving components as described in any one of claims 1 to 4, the two sets of receiving components sharing one set of insulating substrate (1), the insulating frame (2) and the conductive grid pins (4) are respectively arranged on both sides of the insulating substrate (1), wherein the two sets of conductive grid pins (4) installed in the same mounting through hole (101) form an electrical connection.

6. A bipolar battery intermediate electrode plate, characterized in that, It is made using a bipolar battery intermediate grid as described in claim 5.

7. A bipolar battery positive and negative electrode grid, characterized in that, It includes a housing component in a grid for a battery as described in any one of claims 1 to 4, a conductive busbar (6), and electrode ears (7) electrically connected to the conductive busbar (6), wherein the first conductive ends (401) of a plurality of the conductive grid pins (4) are electrically connected to the conductive busbar (6).

8. A bipolar battery with positive and negative electrode plates, characterized in that, It is made using the positive and negative electrode grids of a bipolar battery as described in claim 7.

9. A bipolar battery electrode assembly, comprising at least one bipolar battery intermediate electrode as described in claim 6 and two bipolar battery positive and negative electrode electrodes as described in claim 8, wherein a plurality of the bipolar battery intermediate electrode electrodes are stacked between the two bipolar battery positive and negative electrode electrodes.

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