Battery grid, bipolar battery grid, polar plate and polar plate group

Abstract

The invention relates to the technical field of storage batteries, and particularly discloses a battery grid, a bipolar battery grid, a polar plate and a polar plate group. An insulating substrate and an insulating frame arranged around the insulating substrate are arranged in a containing assembly contained in the grid, a containing cavity is defined by the insulating substrate and the insulating frame, a plurality of mounting through holes are formed in the insulating substrate, and a plurality of conductive grid needles mounted on the mounting through holes are arranged in the containing cavity. And each conductive gate pin comprises a first conductive end which passes through or is arranged in the cavity of the mounting through hole and a second conductive end which is far away from the insulating substrate. By simplifying the structure of the electric conductor including the grid needle, the mass ratio of the conductive part in the plate grid of the polar plate can be reduced, so that the volume of the accommodating cavity for accommodating the positive and negative active substances is increased on the premise of ensuring that the plate grid of the polar plate has a conductive function, and further, after the polar plate is formed, the positive and negative active substances can be accommodated in the accommodating cavity. And the mass ratio of positive and negative active substances in the polar plate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of storage batteries, and in particular to a grid having a receiving assembly for receiving positive and negative electrode active materials, a bipolar battery grid, a pole plate and a pole plate group processed based on the grid. Background Art

[0002] With the rapid development of society and technology, batteries have been widely used and developed in many fields, and a variety of types have emerged. The development of batteries with high specific energy and long service life has always been a hot topic in this field. Because the positive and negative active materials are the carriers of electrochemical reactions and directly determine the energy storage capacity of the battery, increasing the mass ratio of the positive and negative active materials in batteries of the same capacity is a common method for improving batteries.

[0003] Bipolar batteries represent an innovative design compared to traditional monopolar battery structures. These batteries, typically composed of several sets of plates, eliminate the need for separate housings and connectors between traditional battery cells, reducing internal resistance and improving space efficiency. The development and use of these batteries can overcome the limitations of traditional monopolar batteries in terms of high power, high energy density, and compactness.

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

[0005] However, the single set of electrode grids in this patent still contains components such as complex conductive lead plates, which reduces the coating space for positive and negative active materials in the electrode grids. As a result, the specific energy and other performance of the bipolar battery made using the electrode grids still have a lot of room for improvement. Summary of the Invention

[0006] The present invention provides a battery grid, which reduces the mass of the conductor supporting the positive and negative active materials while ensuring the conductive performance of the grid, so that more positive and negative active materials can be loaded in a battery of the same capacity, thereby improving the specific energy of the battery.

[0007] The present invention is achieved through the following technical solutions: A battery grid includes a accommodating 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 accommodating chamber, wherein a plurality of mounting through holes are provided on the insulating substrate, and a plurality of conductive grid pins mounted on the mounting through holes are arranged in the accommodating chamber, each conductive grid pin including a first conductive end passing through or inserted into the chamber of the mounting through hole and a second conductive end away from the insulating substrate.

[0008] As a further improvement of the present invention, the accommodating chamber contacts the insulating frame through a first limiting surface, and a limiting portion of a conductive side grid is provided on the first limiting surface; the conductive side grid also includes a connecting portion, which is used to form an electrical connection between the limiting portion and adjacent conductive grid needles.

[0009] As a further improvement of the present invention, the accommodating chamber contacts the insulating substrate through a second limiting surface, and the connecting portion is provided on the second limiting surface.

[0010] As a further improvement of the present invention, a limiting ring block is formed on the conductive gate pin, so that when the conductive gate pin is installed on the insulating substrate, the limiting ring block covers the installation through hole.

[0011] In the second aspect, the present invention provides a bipolar battery intermediate grid, which includes two groups of accommodating components in any of the above-mentioned battery grids, and the two groups of accommodating components share a group of insulating substrates, and insulating frames and conductive grid pins are respectively arranged on both sides of the insulating substrate, wherein an electrical connection is formed between the two groups of conductive grid pins installed in the same mounting through hole.

[0012] In a third aspect, the present invention provides a bipolar battery intermediate plate, which is manufactured using the above-mentioned bipolar battery intermediate grid. Typically, the bipolar battery intermediate plate is obtained by coating the positive electrode active material and the negative electrode active material in two sets of receiving components of the bipolar battery intermediate grid.

[0013] In a fourth aspect, the present invention provides a bipolar battery positive and negative electrode grid, which includes a set of accommodating components in any of the above-mentioned battery grids, a conductive busbar, and electrode ears electrically connected to the conductive busbar, wherein the first conductive ends of several conductive grid needles are electrically connected to the conductive busbar.

[0014] In a fifth aspect, the present invention provides a bipolar battery positive and negative electrode plate, which is manufactured using the aforementioned bipolar battery positive and negative electrode grid. The positive electrode plate is obtained by coating a positive electrode active material within the housing assembly of the bipolar battery positive and negative electrode grid; and the negative electrode plate is obtained by coating a negative electrode active material within the housing assembly of the bipolar battery positive and negative electrode grid.

[0015] In a sixth aspect, the present invention provides a bipolar battery plate group, comprising at least one bipolar battery intermediate plate and two bipolar battery positive and negative electrode plates, wherein a plurality of bipolar battery intermediate plates are stacked between the two bipolar battery positive and negative electrode plates.

[0016] The beneficial effects of the present invention include: (1) By simplifying the structure of the conductors including the grid pins, the mass ratio of the conductive parts in the plate grid can be reduced, so that the volume of the accommodating chamber for the positive and negative active materials can be increased while ensuring that the plate grid has the conductive function. Therefore, after the plate grid is coated with the positive and negative active materials and formed into a battery plate group, the mass ratio of the positive and negative active materials in the plate group is high, and the specific energy of the corresponding battery is further improved.

[0017] (2) In the present invention, an insulating frame is used to enclose 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 the positive and negative active materials in the battery. At the same time, a number of groups of conductive grid needles are set in the receiving chamber. After the active material layer is placed, the conductive grid needles are inserted into the active material layer. On the one hand, the conductive grid needles can serve as anchoring structures in the active material layer to prevent the active material from falling off from the receiving chamber after long-term use of the battery. On the other hand, the conductive grid needles establish a vertical conductive skeleton in the active material layer, shortening the electron transmission path in the active material layer, and further ensuring that all active materials can participate in the electrochemical reaction.

[0018] (3) By arranging a conductive side grid around the accommodating chamber, on the one hand, the electrical connection between the conductive side grid and the adjacent grid pins can enable the positive and negative active materials placed between the two to participate in the reaction without being wasted; on the other hand, after long-term use of the battery, the positive active material is prone to expansion, and the conductive side grid arranged around the accommodating chamber can restrict and squeeze the active material inside. Under this structure, the expansion of the active material actually promotes its close contact with the conductive side grid, ensuring that the active material fully participates in the electrochemical reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following drawings are provided for use in conjunction with preferred embodiments of the present invention to help understand the objects and advantages of the present invention, wherein: Figure 1 This is a schematic diagram of the first-person perspective structure of the positive and negative electrode grids of a bipolar battery; Figure 2 This is a schematic diagram of the front view structure of the positive and negative electrode grids of a bipolar battery; Figure 3 It is a schematic diagram of the side structure of the positive and negative electrode grids of a bipolar battery; Figure 4 for Figure 2 Cross-sectional view of the positive and negative electrode grids of the bipolar battery at A-A'; Figure 5 This is a schematic diagram of the structure of the middle grid of a bipolar battery from the second perspective; Figure 6 This is a schematic diagram of the front view structure of the middle grid of a bipolar battery; Figure 7 for Figure 6 Cross-sectional view of the middle grid B-B' of a bipolar battery. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and implementation examples.

[0021] In this specification, directional terms such as up, down, left, right, front, back, front, back, top, and bottom, which are mentioned or may be mentioned, are defined relative to the configurations shown in the accompanying drawings. The terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may vary depending on the location and usage of the component. Therefore, these or other directional terms should not be construed as restrictive.

[0022] Example 1: In this embodiment, a bipolar battery positive and negative electrode grid is provided, such as Figures 1 to 4 As shown, it contains a receiving assembly, a conductive busbar 6 and an electrode ear 7 electrically connected to the conductive busbar 6.

[0023] like Figure 1 、 2 As shown in Figures 1 and 4, the receiving assembly includes an insulating substrate 1, an insulating frame 2 arranged around the insulating substrate 1, and a plurality of conductive gate pins 4. For example, in this embodiment, the insulating substrate 1 is a rectangular structure, so the insulating frame 2 is arranged around the insulating substrate 1, and the remaining insulating substrates 1 together form a rectangular receiving chamber 3. N (N is a natural number) groups of conductive gate pins 4 are arranged in the receiving chamber 3. Figure 4As shown, an insulating substrate 1 is provided with N (N is a natural number) groups of mounting holes 101. Each group of mounting holes 101 houses a group of conductive gate pins 4. The first conductive ends 401 of the conductive gate pins 4 are positioned within the mounting holes 101, while the other ends, or second conductive ends 402, are positioned away from the insulating substrate 1. In this structure, the three-dimensional positive and negative active material layers can be placed within the accommodating chamber 3 enclosed by the insulating frame 2. The conductive gate pins 4 can be inserted into the positive and negative active material layers to form a vertical conductive framework, ensuring that the portions of the positive and negative active material layers away from the insulating substrate 1 can fully participate in the electrochemical reaction. Regarding the physical connection between the components, the insulating substrate 1 and the insulating frame 2 can be formed as an integral structure or bonded using an adhesive.

[0024] like Figures 3 and 4 As shown, the conductive busbar 6 is electrically connected to the first conductive end 401 on the conductive grid needle 4, and at the same time, the conductive busbar 6 is electrically connected to the electrode ear 7. In terms of the physical connection between the parts, the electrode ear 7 and the conductive busbar 6 can be an integrally formed structure or connected by welding or other forms; the conductive grid needle 4 and the conductive busbar 6 can be connected by welding or other forms. The welding process or the integral forming process can reduce the direct fusion of metal atoms of the conductive components, greatly reduce the resistance between the conductive components, and ensure full interface conduction between the connected conductive components, and the current density is more uniform; at the same time, the conductive busbar 6 and the insulating substrate 1 can be bonded by an adhesive. Under this structure, the conductive busbar 6 can receive electrons transmitted from the electrode ear 7 and evenly disperse the electrons to each group of conductive grid needles 4; it can also receive and aggregate the electrons collected from each group of conductive grid needles 4 and transmit them to the electrode ear 7. Preferably, if Figure 2 and 4 As shown, the accommodating chamber 3 contacts the insulating frame 2 through the first limiting surface 301, and the limiting portion 501 of the conductive edge grid 5 is provided on the first limiting surface 301. At the same time, the conductive edge grid 5 also includes a connecting portion 502, which can electrically connect the limiting portion 501 with the adjacent conductive grid pin 4. Preferably, as Figure 1 and 3 As shown, the accommodating chamber 3 contacts the insulating substrate 1 via the second limiting surface 302, and the connecting portion 502 is provided on the second limiting surface 302. Regarding the physical connection between the various components, the conductive side grid 5 can be bonded to the insulating frame 2 using an adhesive. In this structure, the conductive side grid 5 and the adjacent conductive grid pins 4 are electrically connected, or not.

[0025] For example, conductive components such as the conductive grid pins 4 and the conductive side grid 5 can be made of different metal materials depending on the battery type. For example, lead or lead alloys can be used in lead-acid batteries, while in lithium-ion batteries, the conductive grid pins in the positive grid can be made of aluminum, and the conductive grid pins 4 in the negative grid can be made of copper. Conductive components such as the conductive busbar 6 and the electrode tabs 7 can be made of metal materials with good conductivity, such as copper, aluminum, or lead. The 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.

[0026] Preferably, the plurality of conductive gate needles 4 in the accommodating chamber 3 in this embodiment are arranged to form a transverse arrangement group and a longitudinal arrangement group, wherein each transverse arrangement group and each longitudinal arrangement group contains at least three conductive gate needles 4 .

[0027] Preferably, if Figure 2 and 4 As shown, a limiting ring block 403 is further formed on the conductive gate pin 4 so that when the conductive gate pin 4 is installed 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 structure can play a role in fixing the conductive gate pin 4.

[0028] Example 2: 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 bipolar battery positive and negative electrode grid receiving components in Example 1. The two sets of receiving components share a set of insulating substrates 1. Insulating frames 2 and conductive grid pins 4 are arranged on both sides of the insulating substrates 1. At the same time, since the two sets of receiving components share a set of insulating substrates 1, two sets of conductive grid pins 4 are respectively arranged in the mounting holes 101 opened on the insulating substrates 1. Figure 7 As shown, the first conductive ends 401 of the two groups of conductive grid pins 4 are electrically connected, while their respective second conductive ends 402 are respectively away from the insulating substrate 1. Under this structure, the two sides of the middle 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 method of each component, the two conductive grid pins 4 built into the same mounting through-hole 101 can be an integrally formed structure and fixed to the insulating substrate 1 through mechanical extrusion, or formed by welding two independent groups of conductive grid pins 4. The integral formation or welded connection of the two groups of conductive grid pins 4 can ensure that the resistance encountered by the two groups when the current flows is low, further reducing the energy loss of the battery made with this grid during high current charging and discharging.

[0029] Preferably, if Figures 6 and 7As shown, within the accommodating chambers 3 on both sides of the insulating substrate 1, the accommodating chambers 3 also contact the insulating frame 2 via first limiting surfaces 301. Limiting portions 501 of the conductive side grids 5 are respectively provided on the first limiting surfaces 301 on both sides. The conductive side grids 5 also include connecting portions 502 that electrically connect the limiting portions 501 to adjacent conductive grid pins 4. Preferably, the two groups of accommodating chambers 3 each contact the insulating substrate 1 via second limiting surfaces 302, and the two groups of connecting portions 502 are provided on the second limiting surfaces 302.

[0030] Preferably, if Figure 5 and 7 As shown, a limiting ring block 403 is also formed on the conductive gate needle 4. Under 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 two groups of conductive gate needles 4 on the same mounting through hole 101.

[0031] Example 3: This embodiment provides a bipolar battery plate assembly, which includes two bipolar battery positive and negative electrode plates and at least one bipolar battery intermediate plate disposed therebetween.

[0032] Among them, the two bipolar positive and negative electrode plates include a positive electrode plate and a negative electrode plate, both of which use the bipolar battery positive and negative electrode grids described in Example 1. The difference is that the positive electrode plate needs to be filled with positive electrode active material in the accommodating chamber 3, and the negative electrode plate needs to be filled with negative electrode active material in the accommodating chamber 3.

[0033] The bipolar battery intermediate plates all adopt the bipolar battery intermediate grid described in Example 2. The positive electrode active material and the negative electrode active material are respectively placed in the accommodating chambers 3 on both sides of the bipolar battery intermediate grid.

[0034] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above implementation cases, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above implementation cases, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

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

2. A battery grid according to claim 1, characterized in that: The accommodating chamber (3) contacts the insulating frame (2) via a first limiting surface (301), and a limiting portion (501) of a conductive side grid (5) is provided on the first limiting surface (301); the conductive side grid (5) further includes a connecting portion (502), and the connecting portion (502) is used to form an electrical connection between the limiting portion (501) and the adjacent conductive grid pin (4).

3. A battery grid according to claim 2, characterized in that: The accommodating chamber (3) contacts the insulating substrate (1) via a second limiting surface (302), and the connecting portion (502) is arranged 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 needle (4), so that when the conductive gate needle (4) is installed on the insulating substrate (1), the limiting ring block (403) covers the installation through hole (101).

5. A bipolar battery intermediate grid, characterized in that: The invention comprises two groups of receiving components in a battery grid as claimed in any one of claims 1 to 4, wherein the two groups of receiving components share a group of insulating substrates (1), the insulating frames (2) and the conductive grid pins (4) are respectively arranged on both sides of the insulating substrate (1), and an electrical connection is formed between the two groups of conductive grid pins (4) installed in the same installation through hole (101).

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

7. A bipolar battery positive and negative electrode grid, characterized in that: The invention comprises a group of accommodating components in a battery grid as claimed 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 positive and negative electrode plate, characterized in that: It is made by using the positive and negative electrode grids of a bipolar battery as described in claim 7.

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

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