Integrated busbar and battery structure

Abstract

The utility model belongs to the technical field of new energy batteries, and discloses an integrated busbar and a battery structure. The integrated busbar comprises a signal acquisition assembly, a first insulating part and a second insulating part. The signal acquisition assembly is located above the battery cell in the first direction and is electrically connected with the battery cell. The first insulating part is located above the signal acquisition assembly in the first direction. The second insulating part is located above the first insulating part in the first direction, the second insulating part comprises a heat conduction layer and a fireproof protection layer, and the heat conduction layer and the fireproof protection layer are arranged in a stacked mode in the first direction. The second insulating part can resist high-temperature flames, metal melts and metal particles sprayed by the battery cell explosion-proof valve, can keep the structure complete at high temperature and flames, prevents the metal melts and metal particles from secondarily damaging the battery cell, has good electrical insulation performance, prevents high-voltage arc discharge caused by short circuit of the battery cell, and prolongs the service life of the battery cell. Therefore, the safety of the integrated busbar is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and in particular to an integrated busbar and battery structure. Background Art

[0002] The integrated busbar is suitable for connecting multiple battery cells in series or in parallel and forming a complete battery pack together with multiple battery cells. This battery pack is arranged in the battery pack installation space of the electrical device, so that the battery pack shell in the traditional battery pack can be omitted to reduce the production cost of the battery pack. Moreover, since the battery pack has no shell, the battery pack can integrate more battery cells in a limited space, thereby improving the energy density of the battery pack.

[0003] However, due to the complex operating conditions of battery packs, there is currently no mature technology in the industry to completely prevent thermal runaway in battery cells. When a battery pack experiences thermal runaway, high-temperature flames, molten metal, and metal particles can erupt from the cell's explosion-proof valve. These substances can fall back onto the copper and aluminum bars, causing a short circuit and high-voltage arcing, leading to battery pack deflagration or even explosion, posing a significant threat to the safety of passengers and property.

[0004] Therefore, there is an urgent need for an integrated busbar and battery structure to solve the above problems. Utility Model Content

[0005] One purpose of the utility model is to provide an integrated busbar with good high-temperature insulation performance, which can prevent the battery cell from short-circuiting when the battery cell explosion-proof valve is activated, thereby ensuring the safe use of the battery cell.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] An integrated busbar is provided, comprising:

[0008] a signal acquisition component, the signal acquisition component being located above the battery cell in the first direction and electrically connected to the battery cell;

[0009] a first insulating member, the first insulating member being located above the signal acquisition component in the first direction;

[0010] A second insulating member is located above the first insulating member in the first direction. The second insulating member includes a heat-conducting layer and a fire-resistant protective layer. The heat-conducting layer and the fire-resistant protective layer are stacked in the first direction.

[0011] As an optional solution for the integrated busbar, the second insulating member includes two heat-conducting layers, and the fire-resistant protective layer is located between the two heat-conducting layers in the first direction.

[0012] As an optional solution for the integrated busbar, the thickness of the heat-conducting layer along the first direction is 0.02 mm-2.0 mm.

[0013] As an optional solution for the integrated busbar, the thickness of the fire-resistant protective layer along the first direction is 0.05 mm-2.0 mm.

[0014] As an optional solution for the integrated busbar, the second insulating member includes a plurality of through holes, and the plurality of through holes are evenly arranged along the second direction.

[0015] As an optional solution for the integrated busbar, the integrated busbar includes two second insulating members, and the two second insulating members are spaced apart in the third direction.

[0016] As an optional solution for the integrated busbar, the integrated busbar further includes a third insulating member, and the third insulating member is located between the signal acquisition component and the battery cell.

[0017] As an optional solution for the integrated busbar, the signal acquisition component includes a circuit board and an idle cell connector, and the cell connector is connected between the circuit board and the cell.

[0018] Another object of the present invention is to provide a battery that can prevent a short circuit in a battery cell when the battery cell explosion-proof valve is activated to release pressure, thereby having good safety performance.

[0019] To achieve this purpose, the present invention adopts the following technical solutions:

[0020] A battery structure is provided, comprising a plurality of battery cells and the above-mentioned integrated busbar, wherein the plurality of battery cells are arranged along a second direction, and the first insulating member and the second insulating member cover all the battery cells above the first direction, wherein the first direction is perpendicular to the second direction.

[0021] As an optional solution for the battery structure, the battery cell includes an explosion-proof valve, the signal acquisition component includes multiple first explosion-proof holes, the first insulating member includes multiple second explosion-proof holes, the second insulating member includes multiple through holes, and the multiple first explosion-proof holes, multiple second explosion-proof holes, and multiple through holes are arranged in a one-to-one correspondence with the explosion-proof valves of the multiple battery cells.

[0022] Beneficial effects of the utility model:

[0023] The utility model provides an integrated busbar, wherein a signal acquisition component is located above the battery cell and is used for collecting data on the working conditions of the battery cell, such as temperature and voltage; a first insulating member is located above the signal acquisition component to realize the insulating packaging of the signal acquisition component; a second insulating member is located above the first insulating member; the second insulating member has good fireproofing and high-temperature electrical insulation performance; the second insulating member includes a heat-conducting layer and a fire-resistant protective layer; the heat-conducting layer can resist high-temperature flames, molten metal and metal particles ejected from the battery cell explosion-proof valve to avoid flame spread, and can maintain structural integrity in high temperature and flame to prevent molten metal and metal particles from causing secondary damage to the battery cell; the fire-resistant protective layer has good electrical insulation and corrosion resistance, can resist electrolyte corrosion, and still has excellent fireproofing and high-temperature electrical insulation performance after being sprayed with high-temperature electrolyte by the battery cell, thereby improving the safety of the integrated busbar.

[0024] The utility model also provides a battery structure, including multiple battery cells and the above-mentioned integrated busbar, wherein the first insulating member and the second insulating member cover the battery cells to ensure the safety of the battery cells during pressure relief, prevent high-temperature melt and particles from damaging the battery cells and causing short circuits, and ensure the safe use of the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the second insulating member provided by the present invention;

[0026] Figure 2 It is a schematic diagram of a first embodiment of the battery structure provided by the present utility model;

[0027] Figure 3 It is a schematic diagram of a second embodiment of the battery structure provided by the present utility model.

[0028] In the picture:

[0029] 1. Signal acquisition component; 11. Circuit board; 12. Battery connector; 13. First explosion-proof hole;

[0030] 2. First insulating member; 21. Second explosion-proof hole;

[0031] 3. Second insulating member; 31. Heat conducting layer; 32. Fire resistant protective layer; 33. Through hole;

[0032] 4. The third insulating member;

[0033] 100, battery cell; 110, explosion-proof valve. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0035] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0038] like Figures 1 to 3 As shown, the integrated busbar of this embodiment includes a signal acquisition component 1, a first insulating member 2 and a second insulating member 3. The signal acquisition component 1 is located above the battery cell 100 in the first direction and is electrically connected to the battery cell 100. The first insulating member 2 is located above the signal acquisition component 1 in the first direction. Figure 2 The second insulating member 3 is located above the first insulating member 2 in the first direction. The second insulating member 3 includes a heat-conducting layer 31 and a fire-resistant protective layer 32. The heat-conducting layer 31 and the fire-resistant protective layer 32 are stacked in the first direction.

[0039] Based on the above design, the signal acquisition component 1 is located above the battery cell 100 and is used to collect data on the operating conditions of the battery cell 100, such as the temperature and voltage. The first insulating member 2 is located above the signal acquisition component 1 to implement the insulation package of the signal acquisition component 1. The second insulating member 3 is located above the first insulating member 2. The second insulating member 3 has excellent fire resistance and high-temperature electrical insulation performance. The second insulating member 3 includes a thermal conductive layer 31 and a fire-resistant protective layer 32. The thermal conductive layer 31 can resist the high-temperature flames, molten metal, and metal particles ejected when the battery cell 100 is depressurized, preventing the spread of flames. It can maintain structural integrity in high temperatures and flames, preventing the molten metal and metal particles from causing secondary damage to the battery cell 100. The fire-resistant protective layer 32 has excellent electrical insulation and corrosion resistance, can resist electrolyte corrosion, and still has excellent fire resistance and high-temperature electrical insulation performance after being sprayed with high-temperature electrolyte by the battery cell 100, thereby improving the safety of the integrated busbar.

[0040] In some embodiments, the second insulating member 3 includes only one thermally conductive layer 31 and one fire-resistant protective layer 32. Preferably, the fire-resistant protective layer 32 can be located below the thermally conductive layer 31, that is, the fire-resistant protective layer 32 is located on the side of the second insulating member 3 facing the first insulating member 2, and the thermally conductive layer 31 is located on the side of the second insulating member 3 facing away from the first insulating member 2. Of course, the fire-resistant protective layer 32 can also be located above the thermally conductive layer 31. In some other embodiments, the second insulating member 3 can also include two thermally conductive layers 31 and one fire-resistant protective layer 32, with the fire-resistant protective layer 32 located between the two thermally conductive layers 31 in the first direction, which can further improve the fireproofing and high-temperature resistance of the second insulating member 3. The thermally conductive layer 31 and the fire-resistant protective layer 32 can be integrally formed to ensure that the second insulating member 3 has good integrity.

[0041] Optionally, the thermal conductive layer 31 is made of ceramic silicone rubber material. Ceramic silicone rubber has excellent fire resistance, flame retardancy, low smoke, non-toxicity and other properties, a simple molding process, and low production cost. The residue after combustion is a hard ceramic shell. The hard shell does not melt or drip in a fire environment, and can remain intact after being exposed to fire at a temperature of 950°C-1000°C for 90 minutes. It is suitable for a variety of places that require fire protection.

[0042] Preferably, the thickness of the thermal conductive layer 31 can be customized according to usage needs. Specifically, when the thickness of the thermal conductive layer 31 along the first direction is 0.02 mm to 2.0 mm, this ensures the structural strength of the thermal conductive layer 31 and the high-temperature resistance of the second insulating member 3 while preventing excessive thickness of the second insulating member 3, which could result in waste of production materials. For example, the thickness of the thermal conductive layer 31 can be 0.02 mm, 0.05 mm, 0.1 mm, 0.5 mm, 1.0 mm, 1.5 mm, or 2.0 mm.

[0043] Optionally, the fire-resistant protective layer 32 is made of high-temperature resistant fiber cloth. For example, the high-temperature resistant fiber cloth can be made of glass fiber, basalt, carbon fiber and other materials. It has excellent organizational structure and excellent properties such as high temperature resistance, electrical insulation, oxidation resistance, and corrosion resistance. The high temperature resistance is 550℃-1100℃, and due to fiber reinforcement, the material has high mechanical strength and can withstand high-temperature melt and particle splashing and electrolyte corrosion.

[0044] Preferably, the thickness of the fire-resistant protective layer 32 can be customized according to usage needs. Specifically, when the thickness of the fire-resistant protective layer 32 along the first direction is 0.05 mm to 2.0 mm, this ensures the structural strength of the fire-resistant protective layer 32 while preventing excessive thickness of the second insulating member 3, which could result in waste of production materials. For example, the thickness of the fire-resistant protective layer 32 can be 0.05 mm, 0.1 mm, 0.5 mm, 1.0 mm, 1.5 mm, or 2.0 mm.

[0045] It should be noted that as the thickness of the thermal conductive layer 31 and the fire-resistant protective layer 32 decreases, the second insulating member 3 can have excellent flexibility and conformability, which is convenient for processing and installation. It can also fit tightly on uneven surfaces and has the advantage of being lightweight, which can improve the weight energy density of the battery.

[0046] In order to prevent the second insulating member 3 from covering the explosion-proof valve 110 when the explosion-proof valve 110 is depressurized, thereby preventing the pressure relief from being blocked, a relief structure needs to be provided on the second insulating member 3. In some embodiments, the second insulating member 3 includes a plurality of through holes 33, and the plurality of through holes 33 are evenly arranged along the second direction. Figure 2 The through hole 33 is arranged corresponding to the explosion-proof valve 110 to prevent the second insulating member 3 from covering the explosion-proof valve 110 and affecting the pressure relief, and to avoid the impact on the second insulating member 3 during the pressure relief. In some other embodiments, the integrated busbar may also include two second insulating members 3, which are spaced apart in the third direction. Figure 3 In the middle Z direction, the explosion-proof valve 110 corresponds to between the two second insulating members 3 in the third direction, so that the second insulating members 3 avoid the explosion-proof valve 110. The first direction, the second direction and the third direction are perpendicular to each other.

[0047] Furthermore, the signal acquisition assembly 1 includes a circuit board 11 and a cell connector 12, wherein the cell connector 12 is connected between the circuit board 11 and the cell 100. In the prior art, the circuit board 11 can be an FPC circuit board, a PCB circuit board, etc., and the cell connector 12 can be a copper bar or an aluminum bar, which is also applicable in this embodiment and will not be repeated here.

[0048] Optionally, when the integrated busbar includes two second insulating members 3 spaced apart in a third direction, the two second insulating members 3 may also directly abut against the upper surface of the signal acquisition component 1, so that the second insulating members 3 fit tightly against the signal acquisition component 1, thereby increasing the protection effect on the signal acquisition component 1.

[0049] Furthermore, the integrated busbar further includes a third insulating member 4 , which is located between the signal acquisition component 1 and the battery cell 100 to achieve insulation packaging of the lower surface of the signal acquisition component 1 .

[0050] This embodiment also provides a battery structure, including multiple battery cells 100 and the above-mentioned integrated busbar, the multiple battery cells 100 are arranged along the second direction, and the first insulating member 2 and the second insulating member 3 cover all the battery cells 100 above the first direction to ensure the safety of the battery cells 100 during pressure relief, prevent high-temperature melt and particles from damaging the battery cells 100 and causing a short circuit, and ensure the safe use of the battery cells 100.

[0051] Specifically, the battery cell 100 includes an explosion-proof valve 110, the signal acquisition assembly 1 includes multiple first explosion-proof holes 13, the first insulating member 2 includes multiple second explosion-proof holes 21, and the second insulating member 3 includes multiple through-holes 33. The multiple first explosion-proof holes 13, the multiple second explosion-proof holes 21, and the multiple through-holes 33 are arranged in a one-to-one correspondence with the explosion-proof valves 110 of the multiple battery cells 100. This arrangement prevents the signal acquisition assembly 1, the first insulating member 2, and the second insulating member 3 from interfering with the pressure relief of the explosion-proof valve 110, thereby preventing impact on the signal acquisition assembly 1, the first insulating member 2, and the second insulating member 3 during pressure relief, thereby ensuring the safety of the battery structure.

[0052] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An integrated busbar, characterized in that: include: A signal acquisition component (1), the signal acquisition component (1) being located above the battery cell (100) in a first direction and electrically connected to the battery cell (100); a first insulating member (2), the first insulating member (2) being located above the signal acquisition component (1) in the first direction; A second insulating member (3), the second insulating member (3) is located above the first insulating member (2) in the first direction, the second insulating member (3) comprises a heat-conducting layer (31) and a fire-resistant protective layer (32), the heat-conducting layer (31) and the fire-resistant protective layer are stacked in the first direction.

2. The integrated busbar according to claim 1, characterized in that: The second insulating member (3) comprises two heat-conducting layers (31), and the fire-resistant protective layer (32) is located between the two heat-conducting layers (31) in the first direction.

3. The integrated busbar according to claim 1, characterized in that: The thickness of the heat-conducting layer (31) along the first direction is 0.02 mm to 2.0 mm.

4. The integrated busbar according to claim 1, characterized in that: The thickness of the fire-resistant protective layer (32) along the first direction is 0.05 mm to 2.0 mm.

5. The integrated busbar according to claim 1, characterized in that: The second insulating member (3) comprises a plurality of through holes (33), and the plurality of through holes (33) are evenly arranged along the second direction.

6. The integrated busbar according to claim 1, characterized in that: The integrated busbar comprises two second insulating members (3), and the two second insulating members (3) are spaced apart in the third direction.

7. The integrated busbar according to claim 1, characterized in that: The integrated busbar further comprises a third insulating member (4), and the third insulating member (4) is located between the signal acquisition component (1) and the battery core (100).

8. The integrated busbar according to claim 1, characterized in that: The signal acquisition component (1) comprises a circuit board (11) and a battery cell connector (12), wherein the battery cell connector (12) is connected between the circuit board (11) and the battery cell (100).

9. A battery structure, characterized in that: The invention comprises a plurality of battery cells (100) and an integrated busbar according to any one of claims 1 to 8, wherein the plurality of battery cells (100) are arranged along a second direction, the first insulating member (2) and the second insulating member (3) cover all the battery cells (100) above the first direction, wherein the first direction is perpendicular to the second direction.

10. The battery structure according to claim 9, characterized in that: The battery cell (100) includes an explosion-proof valve (110), the signal acquisition component (1) includes a plurality of first explosion-proof holes (13), the first insulating member (2) includes a plurality of second explosion-proof holes (21), the second insulating member (3) includes a plurality of through holes (33), and the plurality of first explosion-proof holes (13), the plurality of second explosion-proof holes (21), and the plurality of through holes (33) are arranged in a one-to-one correspondence with the explosion-proof valves (110) of the plurality of battery cells (100).

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