Battery pack

Abstract

The utility model relates to battery technical field discloses a kind of battery pack, comprising: box;Battery cell module, including multiple battery cell arranged in the inside of box along Y direction;Along X direction, the end portion of battery cell is equipped with cover plate, and cover plate is equipped with pole and explosion-proof valve;Insulating patch, be located at one end of battery cell module and extend to the circumferential side of battery cell module, insulating patch is bonded on the cover plate of multiple battery cell, and insulating patch is equipped with with multiple pole one-to-one corresponding setting avoidance mouth, and pole has part to go out corresponding avoidance mouth, and insulating patch is also equipped with with multiple explosion-proof valve one-to-one corresponding setting annular indentation.The utility model bends part of insulating patch from the cover plate of battery cell to the circumferential side of battery cell module, can effectively increase the contact area between insulating patch and battery cell module, so as to make insulating patch more firmly bonded on battery cell module, avoid the problem that insulating patch is raised in conventional technical scheme, falls off.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery pack. Background Technology

[0002] Currently, to improve the overall space utilization and energy density of battery packs, individual cells are becoming thinner and thinner, and the cover plate size is getting smaller and smaller. Furthermore, the cell cover plate also integrates terminals, explosion-proof valves, and cell temperature sensing areas that need to be avoided, resulting in a decreasing effective bonding area between the insulating patch and the cover plate. Therefore, during battery pack use, the insulating patch is prone to lifting and detachment, reducing the safety of the battery pack. Utility Model Content

[0003] In view of this, the present invention provides a battery pack to solve the problem that the insulating patch is prone to peeling and falling off.

[0004] This utility model provides a battery pack, comprising: Box; The battery cell module includes multiple battery cells arranged along the Y direction inside the housing; along the X direction, the ends of the battery cells are provided with cover plates, and the cover plates are provided with terminals and explosion-proof valves; An insulating patch is disposed at one end of the battery cell module and extends to the periphery of the battery cell module. The insulating patch is bonded to the cover plates of multiple battery cells. The insulating patch has clearance openings that correspond one-to-one with multiple terminals. Part of the terminal extends out of the corresponding clearance opening. The insulating patch also has annular indentations that correspond one-to-one with multiple explosion-proof valves.

[0005] Beneficial effects: This invention bends a portion of the insulating patch from the cover plate of the battery cell to the periphery of the battery cell module, effectively increasing the contact area between the insulating patch and the battery cell module. This allows the insulating patch to adhere more firmly to the battery cell module, avoiding the problems of insulating patch lifting and falling off in conventional solutions. Furthermore, compared to conventional solutions where an insulating patch is placed on the cover plate of each battery cell, this invention integrates multiple insulating patches into a single unit. This not only improves assembly efficiency and avoids the need to individually attach each insulating patch, but also enhances the structural strength of the insulating patch itself.

[0006] In one alternative embodiment, along the X direction, the orthographic projection of the annular indentation toward the explosion-proof valve coincides with the outer peripheral edge of the corresponding explosion-proof valve, or the orthographic projection of the annular indentation toward the explosion-proof valve surrounds the outer periphery of the corresponding outer peripheral edge of the explosion-proof valve.

[0007] Beneficial effects: The orthographic projection of the annular indentation onto the explosion-proof valve coincides with the outer peripheral edge of the corresponding explosion-proof valve. On the one hand, this ensures that the annular indentation precisely matches the effective range of the explosion-proof valve. When the explosion-proof valve opens, the pressure and impact force generated can directly act on the annular indentation corresponding to the edge of the explosion-proof valve, ensuring precise rupture at the annular indentation. The resulting pressure relief channel can fully adapt to the venting range of the explosion-proof valve, avoiding poor venting in some areas or obstruction of venting by residual insulating pads due to indentation deviation. On the other hand, under normal operating conditions, the orthographic projection of the annular indentation coincides with the outer peripheral edge of the explosion-proof valve, ensuring that the explosion-proof valve area is completely and precisely covered by the insulating pad. This prevents additional weakening of the strength of other areas of the insulating pad due to the indentation exceeding the explosion-proof valve range, and also prevents gaps in the insulation protection around the explosion-proof valve due to insufficient indentation. Thus, while ensuring the accuracy of the explosion-proof response, the overall structural stability and insulation reliability of the insulating pad are maintained. The annular indentation, with its projection onto the explosion-proof valve, surrounds the outer edge of the corresponding explosion-proof valve's projection, allowing for rapid venting and pressure relief when the explosion-proof valve is opened.

[0008] In one alternative embodiment, the annular indentation is an annular groove provided on the side of the insulating patch away from the cover plate; along the X direction, the groove depth of the annular groove is 1 / 2 to 2 / 3 of the thickness of the insulating patch.

[0009] Beneficial effects: This invention transforms the annular indentation into an annular groove, reducing the thickness of the insulating patch at this point. This allows the pressure generated by the opening of the explosion-proof valve during thermal runaway of the battery cell to be concentrated on the annular groove, enabling it to rupture more smoothly and quickly, forming a pressure relief channel. This avoids the problem of venting obstruction caused by excessively thick insulating patches. Furthermore, the groove depth is 1 / 2 to 2 / 3 of the insulating patch thickness. This ensures the structural strength of the remaining ungrooved portion of the insulating patch, allowing it to stably cover the explosion-proof valve area and maintain good insulation performance, avoiding the risk of short circuits caused by deformation or displacement of the insulating patch due to insufficient strength. On the other hand, when the battery cell experiences thermal runaway and the explosion-proof valve opens, the 1 / 2 to 2 / 3 groove depth creates a perfectly positioned weak point at the annular groove, allowing for rapid rupture under pressure. This avoids the difficulty of rupture and venting obstruction caused by an excessively shallow groove, or premature damage to the patch due to daily vibration or minor impacts due to an excessively deep groove.

[0010] In one alternative embodiment, the annular indentation divides the insulating patch into a main body and an opening portion, the opening portion being disposed opposite to the explosion-proof valve, and the opening portion being provided with an exhaust port.

[0011] Beneficial effects: By setting an exhaust port on the opening part, this utility model can discharge the gas generated by the battery cell during normal operation to the outside of the battery cell module, avoiding the accumulation of gas between the battery cell and the insulating patch to form local pressure, thereby reducing the possibility of the explosion-proof valve being accidentally triggered or deformed.

[0012] In one optional embodiment, the vent is located between the end of the opening portion in the length or width direction of the explosion-proof valve and the edge corresponding to the annular indentation, and the length L0 of the vent is 0.5 mm to 1.5 mm along the length or width direction of the explosion-proof valve.

[0013] Beneficial effects: This utility model controls the length L0 of the exhaust port to be between 0.5mm and 1.5mm. On the one hand, this length range can ensure that the exhaust port has sufficient exhaust area to meet the exhaust requirements under normal working conditions of the battery cell. On the other hand, this length range can ensure that the remaining part of the opening part can insulate and isolate the explosion-proof valve from its surrounding structure, preventing current from forming a conductive path with the surrounding structure through the explosion-proof valve, thus ensuring the electrical safety of the battery cell.

[0014] In one alternative embodiment, the length L of the insulating patch located on the periphery of the battery cell module along the X direction is 5 mm to 10 mm.

[0015] Beneficial effects: This utility model controls the length L of the insulating patch located on the periphery of the cell module to be between 5mm and 10mm. On the one hand, it can ensure that there is sufficient contact area between the insulating patch and the cell module, ensuring the connection stability between the insulating patch and the cell module, and preventing the insulating patch from falling off easily due to insufficient contact area, thereby ensuring the continuity of insulation effect. On the other hand, it can prevent the insulating patch from occupying too much space around the cell module, and will not cause layout conflicts with other components inside the battery pack. This is conducive to the compact design of the overall battery pack structure and saves internal space.

[0016] In one alternative embodiment, the thickness T of the insulating patch is 80 μm to 110 μm.

[0017] Beneficial effects: This invention controls the thickness T of the insulating patch to between 80μm and 110μm, ensuring good insulation performance, effectively blocking current conduction that may occur around the battery cell module, and avoiding safety hazards such as short circuits; while also avoiding increasing the overall volume of the battery cell module due to excessive thickness, which is beneficial for the efficient use of internal space in the battery pack. In addition, the appropriate thickness also ensures that the insulating patch has a certain degree of flexibility, making it easier to adhere to the surface of the battery cell module, improving the stability of the connection, and further ensuring the safety and reliability of the battery cell module operation.

[0018] In one optional embodiment, the insulating patch is made of polyethylene terephthalate.

[0019] Beneficial effects: First, polyethylene terephthalate (PET) has excellent insulation properties (high volume resistivity), reliably blocking the current path between the battery cell and surrounding structures, meeting the insulation protection requirements of explosion-proof valves and electrode areas. Second, PET has good high-temperature resistance (can withstand temperatures above 120℃ for short periods), adapting to the temperature rise during normal battery cell operation and the high-temperature environment in the early stages of thermal runaway, and is not easily melted or decomposed due to excessive temperature, ensuring the stability of insulation function. Third, PET has relatively low hardness, making it easy to bend the insulating patch to the periphery of the battery cell module, tightly fitting the complex contours of the module, ensuring that corners, gaps, and other critical areas are fully covered, avoiding insulation dead zones. At the same time, this good flexibility also reduces the difficulty of the processing, reducing material damage caused by forced bending, improving production efficiency, and ensuring the integrity of insulation protection, keeping the entire battery cell module in a reliable state of insulation protection throughout assembly and use.

[0020] In one optional embodiment, the battery cell is a blade battery cell. Along the X direction, both ends of the battery cell are provided with cover plates. One of the cover plates is provided with the explosion-proof valve, and the other cover plate is provided with a liquid injection hole. Along the Y direction, the explosion-proof valve and the liquid injection hole of two adjacent battery cells are alternately arranged. The insulating patch is a pair. The pair of insulating patches are respectively bonded to both ends of the battery cell module in the X direction and partially extend to the periphery of the battery cell module. The clearance opening on each insulating patch is spaced apart from the annular indentation.

[0021] Beneficial effects: This invention provides insulating patches at both ends of the cell module in the X direction, effectively isolating the cover plates at both ends of the blade cell and preventing short circuits caused by direct contact between the cover plates and the cell module housing or other metal components. Secondly, the spacing between the clearance opening and the annular indentation ensures the structural strength of the insulating patch and prevents tearing or damage in that area due to the clearance opening being too close to the annular indentation, thus ensuring the long-lasting and stable insulation effect of the insulating patch on the cover plate.

[0022] In one optional embodiment, the battery cell is a square battery cell, a pair of terminals are provided on the cover plate, the explosion-proof valve is located between the pair of terminals, multiple cover plates are located on the same side, and insulating patches are adhered to the cover plates of multiple battery cells and partially extend to the periphery of the battery cell module.

[0023] Beneficial effects: The explosion-proof valve is located between a pair of poles, which means that the clearance port is set at an interval between the clearance port and the annular indentation on the insulating patch. This ensures that the insulating patch retains sufficient connection area between the clearance port and the annular indentation, enhances the structural stability of the insulating patch, prevents tearing due to insufficient local strength, and ensures a long-lasting and reliable insulation protection effect on the cover plate. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of an assembly structure for assembling a battery cell module and an insulating patch according to an embodiment of the present utility model. Figure 2 for Figure 1 The diagram shows a battery cell module not assembled with an insulating patch. Figure 3 for Figure 2 A magnified view of part A in the diagram; Figure 4 This is a schematic diagram of an assembly structure for assembling a battery cell module and an insulating patch according to another embodiment of the present utility model. Figure 5 for Figure 4 The diagram shows a battery cell module not assembled with an insulating patch.

[0026] Explanation of reference numerals in the attached figures: 1. Battery cell module; 101. Battery cell; 102. Cover plate; 103. Explosion-proof valve; 104. Terminal post; 2. Insulating patch; 201. Annular indentation; 202. Main body; 203. Opening part; 2031. Exhaust port; 204. Clearance opening. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] The following is combined with Figures 1 to 5 The following describes embodiments of the present invention.

[0029] According to embodiments of the present invention, such as Figures 1 to 4 As shown, a battery pack is provided, including: a housing, a cell module 1, and an insulating patch 2.

[0030] Specifically, the battery cell module 1 includes multiple battery cells 101 arranged along the Y direction inside the housing; along the X direction, the end of the battery cell 101 is provided with a cover plate 102, and the cover plate 102 is provided with a terminal post 104 and an explosion-proof valve 103; an insulating patch 2 is provided at one end of the battery cell module 1 and extends to the periphery of the battery cell module 1, the insulating patch 2 is bonded to the cover plate 102 of multiple battery cells 101, the insulating patch 2 is provided with a clearance opening 204 corresponding to the multiple terminal posts 104, a portion of the terminal post 104 extends out of the corresponding clearance opening 204, the insulating patch 2 is also provided with annular indentations 201 corresponding to the multiple explosion-proof valves 103, the explosion-proof valve 103 is adapted to break through the insulating patch 2 through the corresponding annular indentation 201.

[0031] In this embodiment of the invention, a portion of the insulating patch 2 is bent from the cover plate 102 of the battery cell 101 to the periphery of the battery cell module 1. This effectively increases the contact area between the insulating patch 2 and the battery cell module 1, thereby enabling the insulating patch 2 to adhere more firmly to the battery cell module 1 and avoiding the problem of the insulating patch 2 lifting and falling off in conventional technical solutions. Furthermore, compared to the conventional solution where one insulating patch 2 is provided on the cover plate 102 of each battery cell 101, this embodiment of the invention integrates multiple insulating patches 2 into a single unit. This not only improves assembly efficiency and avoids pasting each insulating patch 2 individually, but also enhances the structural strength of the insulating patch 2 itself.

[0032] It is understood that adhesive is provided between the insulating patch 2 and the cover plate 102 and the peripheral sidewall of the cell module 1, thus ensuring sufficient adhesive force between the insulating patch 2 and the cell module 1. Specifically, the adhesive is an insulating adhesive. For example, the adhesive may be, but is not limited to, silicone insulating adhesive, epoxy resin insulating adhesive, acrylic insulating adhesive, and polyurethane insulating adhesive.

[0033] Furthermore, the following situations are included but not limited to the following: 1. The edge of the insulating patch 2 in the Y direction is bent towards the periphery of the battery module 1 and adheres to the corresponding side wall of the battery module 1; 2. The edge of the insulating patch 2 in the Z direction is bent towards the periphery of the battery module 1 and adheres to the corresponding side wall of the battery module 1; 3. All edges of the insulating patch 2 are bent towards the periphery of the battery module 1 and adhere to the corresponding side wall of the battery module 1.

[0034] Furthermore, in this embodiment, the clearance opening 204 is set to correspond one-to-one with the pole post 104. This ensures that the pole post 104 can smoothly pass through the insulating patch 2 to achieve the electrical connection function, while also effectively isolating the area around the pole post 104 through the insulating patch 2, preventing short circuits between the pole post 104 and the cover plate 102 or other metal parts of the cell module 1, thus enhancing the overall insulation performance.

[0035] It should be noted that the present invention does not impose any particular limitation on the type or shape of the battery cell 101, which can be a blade battery cell, a square battery cell, or any other type of battery cell 101. The battery cell 101 in the present invention can also be a lithium-ion battery cell, a potassium-ion battery cell, a sodium-ion battery cell, a lithium-sulfur battery cell, etc., with lithium-ion battery cells being particularly preferred.

[0036] It should be further explained that in conventional technical solutions, through holes are usually provided on the insulating patch 2 opposite to the explosion-proof valve 103. This allows the explosion-proof valve 103 and battery cell 101 to open smoothly under thermal runaway conditions, preventing the insulating patch 2 from obstructing the normal operation of the explosion-proof valve 103 and preventing more dangerous situations such as shell rupture or explosion caused by the inability to release internal pressure in the battery cell 101 in time. Furthermore, to prevent the explosion-proof valve 103 from short-circuiting with surrounding structures through the through holes under normal operating conditions, explosion-proof valve 103 patches are usually placed inside the through holes. However, since the battery cell module 1 is generally composed of multiple battery cells 101, attaching the explosion-proof valve 103 patches one by one to the corresponding explosion-proof valve 103 would undoubtedly prolong assembly time and reduce production efficiency. Based on this, this embodiment of the invention eliminates the through hole and provides an annular indentation 201 at the position corresponding to the insulating patch 2 and the explosion-proof valve 103. This ensures that the insulating patch 2 does not affect the smooth opening of the explosion-proof valve 103 under thermal runaway conditions, while also insulating and isolating the explosion-proof valve 103 from its surrounding structure, thus improving the safety of the battery cell module 1. Therefore, in this case, this embodiment does not require additional bonding of the explosion-proof valve 103 patch, which not only simplifies the assembly process of the battery cell module 1 and shortens the assembly time, but also reduces the production cost of the battery cell module 1.

[0037] According to one embodiment of the present invention, along the X direction, the orthographic projection of the annular indentation 201 toward the explosion-proof valve 103 coincides with the outer peripheral edge of the corresponding explosion-proof valve 103, or the orthographic projection of the annular indentation 201 toward the explosion-proof valve 103 surrounds the outer periphery of the orthographic projection of its corresponding explosion-proof valve 103. This design serves two purposes. First, it ensures that the annular indentation 201 precisely matches the effective range of the explosion-proof valve 103. When the explosion-proof valve 103 opens, the resulting pressure and impact force act directly on the annular indentation 201 corresponding to the edge of the explosion-proof valve 103, ensuring precise rupture at the annular indentation 201. The resulting pressure relief channel perfectly matches the exhaust range of the explosion-proof valve 103, preventing exhaust obstruction in some areas or obstruction of exhaust by residual insulating patch 2 due to indentation deviation. Second, under normal operating conditions, the orthographic projection of the annular indentation 201 coincides with the outer periphery of the explosion-proof valve 103, ensuring that the area of ​​the explosion-proof valve 103 is completely and precisely covered by the insulating patch 2. This prevents additional weakening of the strength of other areas of the insulating patch 2 due to the indentation exceeding the range of the explosion-proof valve 103, and also prevents gaps in the insulation protection around the explosion-proof valve 103 due to insufficient indentation. Thus, while ensuring the accuracy of the explosion-proof response, it maintains the overall structural stability and insulation reliability of the insulating patch 2. The annular indentation 201, with its projection onto the explosion-proof valve 103, surrounds the outer edge of the corresponding outer periphery of the explosion-proof valve 103's projection, which can also enable rapid venting and depressurization when the explosion-proof valve 103 is opened.

[0038] According to one embodiment of the present invention, such as Figures 1 to 5 As shown, the annular indentation 201 is an annular groove provided on the side of the insulating patch 2 away from the cover plate 102. In this embodiment of the invention, the annular indentation 201 is made into an annular groove, which can reduce the thickness of the insulating patch 2 at this location. In this way, when the cell 101 experiences thermal runaway, the pressure generated by the opening of the explosion valve can be concentrated on the annular groove, allowing it to break more smoothly and quickly to form a pressure relief channel, thus avoiding the problem of air venting being blocked due to the excessive thickness of the insulating patch 2.

[0039] Furthermore, along the X direction, the groove depth of the annular groove is 1 / 2 to 2 / 3 of the thickness of the insulating patch 2. This design ensures, on the one hand, the structural strength of the remaining ungrooved portion of the insulating patch 2, allowing it to stably cover the area of ​​the explosion-proof valve 103, maintaining good insulation performance, and avoiding the risk of short circuits caused by deformation or displacement of the insulating patch 2 due to insufficient strength; on the other hand, when the battery cell 101 experiences thermal runaway and the explosion-proof valve 103 opens, the groove depth of 1 / 2 to 2 / 3 creates a just-right weak point at the annular groove, allowing it to rupture quickly under pressure. This avoids the difficulty of rupture and obstruction of venting due to an excessively shallow groove, and also prevents premature damage to the patch under daily vibration or minor impacts due to an excessively deep groove.

[0040] According to one embodiment of the present invention, such as Figures 1 to 5As shown, the annular indentation 201 divides the insulating patch 2 into a main body 202 and an opening portion 203. The opening portion 203 is disposed opposite to the explosion-proof valve 103, and an exhaust port 2031 is provided on the opening portion 203. In this embodiment, by providing an exhaust port 2031 on the opening portion 203, the gas generated by the battery cell 101 during normal operation can be discharged to the outside of the battery cell module 1, avoiding the accumulation of gas between the battery cell 101 and the insulating patch 2 to form local pressure, thereby reducing the possibility of the explosion-proof valve 103 being falsely triggered or deformed.

[0041] According to one embodiment of the present invention, the exhaust port 2031 is located between the end of the opening portion 203 in the length or width direction of the explosion-proof valve 103 and the edge of the corresponding annular indentation 201. Along the length or width direction of the explosion-proof valve 103, the length L0 of the exhaust port 2031 is 0.5mm to 1.5mm. It can be understood that by controlling the length L0 of the exhaust port 2031 to be between 0.5mm and 1.5mm in this embodiment of the present invention, on the one hand, this length L0 range can ensure sufficient exhaust area for the exhaust port 2031 to meet the exhaust requirements of the battery cell 101 under normal operating conditions; on the other hand, this length range allows the remaining portion of the opening portion 203 to insulate the explosion-proof valve 103 from its surrounding structure, preventing current from forming a conductive path between the explosion-proof valve 103 and the surrounding structure, thus ensuring the electrical safety of the battery cell 101.

[0042] It is understood that the value of L0 can be, but is not limited to, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, or any value between the two.

[0043] It should be noted that the exhaust port 2031 can also be formed in other areas of the opening portion 203, such as the middle area. This is as long as it ensures that the exhaust port 2031 can achieve smooth exhaust without interfering with the insulation of the opening portion 203. Therefore, this embodiment of the invention does not impose specific limitations on this aspect.

[0044] It should be noted that the position of the explosion-proof valve 103 on the cover plate 102 can be adjusted according to actual design requirements. For example, such as... Figure 1 and Figure 2 As shown, the length direction of the explosion-proof valve 103 located on the cover plate 102 of the blade cell 101 is parallel to... Figure 1 , Figure 2 The Z direction is consistent; such as Figure 4 and Figure 5 As shown, the length direction of the explosion-proof valve 103 located on the cover plate 102 of the square battery cell 101 is parallel to the direction of the explosion-proof valve 103. Figure 4 , Figure 5 The Y direction is consistent with that in the middle.

[0045] According to one embodiment of the present invention, the length L of the insulating patch 2 located on the periphery of the cell module 1 along the X direction is 5mm to 10mm. This embodiment of the present invention controls the length L of the insulating patch 2 located on the periphery of the cell module 1 to be between 5mm and 10mm. On the one hand, this ensures sufficient contact area between the insulating patch 2 and the cell module 1, guaranteeing the connection stability between the insulating patch 2 and the cell module 1, preventing the insulating patch 2 from easily falling off due to insufficient contact area, thereby ensuring the continuity of the insulation effect. On the other hand, it avoids the insulating patch 2 excessively occupying the space around the cell module 1, preventing layout conflicts with other components inside the battery pack, which is conducive to the compact design of the overall battery pack structure and saves internal space.

[0046] It is understood that the value of L can be, but is not limited to, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm or any value between the two.

[0047] According to one embodiment of this utility model, the thickness T of the insulating patch 2 is 80μm to 110μm. This embodiment of the utility model controls the thickness T of the insulating patch 2 to be between 80μm and 110μm, which ensures good insulation performance, effectively blocking current conduction that may occur around the battery cell module 1 and avoiding safety hazards such as short circuits; at the same time, it does not increase the overall volume of the battery cell module 1 due to excessive thickness T, which is beneficial for the efficient utilization of the internal space of the battery pack. Furthermore, a suitable thickness T also ensures that the insulating patch 2 has a certain degree of flexibility, making it easier to adhere to the surface of the battery cell module 1, improving the stability of the connection, and further ensuring the safety and reliability of the battery cell module 1 during operation.

[0048] It is understood that the value of T can be, but is not limited to, 80μm, 81μm, 82μm, 85μm, 86μm, 88μm, 90μm, 93μm, 94μm, 96μm, 97μm, 100μm, 101μm, 103μm, 105μm, 107μm, 109μm, 110μm or any value between the two.

[0049] According to one embodiment of this utility model, the insulating patch 2 is made of polyethylene terephthalate (PET). Firstly, PET has excellent insulation properties (high volume resistivity), reliably blocking the current path between the battery cell 101 and the surrounding structure, meeting the insulation protection requirements of the explosion-proof valve 103 and the pole post 104 area. Secondly, PET has good high-temperature resistance (can withstand temperatures above 120°C for short periods), adapting to the temperature rise during normal operation of the battery cell 101 and the high-temperature environment in the initial stage of thermal runaway, and is not easily melted or decomposed due to excessive temperature, ensuring the stability of the insulation function. Thirdly, PET has relatively low hardness, making it easy to bend the insulating patch 2 to the periphery of the battery cell module 1, tightly fitting the complex contours of the module, ensuring that key areas such as corners and gaps are fully covered, and avoiding insulation dead zones. At the same time, this good flexibility also reduces the difficulty of the processing and reduces the material damage caused by forced bending. It not only improves production efficiency, but also ensures the integrity of insulation protection, so that the entire battery cell module 1 is always in a reliable state of insulation protection during assembly and use.

[0050] According to one embodiment of the present invention, the battery cell 101 is a blade battery cell. Along the X direction, both ends of the battery cell 101 are provided with cover plates 102. One cover plate 102 is provided with an explosion-proof valve 103, and the other cover plate 102 is provided with a liquid injection hole. Along the Y direction, the explosion-proof valve 103 and the liquid injection hole of two adjacent battery cells 101 are alternately arranged. The insulating patch 2 is a pair. The pair of insulating patches 2 are respectively bonded to both ends of the battery cell module 1 in the X direction and partially extend to the periphery of the battery cell module 1. The clearance opening 204 on each insulating patch 2 is spaced apart from the annular indentation 201.

[0051] This embodiment of the invention features insulating patches at both ends of the battery cell module in the X direction. This effectively insulates and isolates the cover plates at both ends of the blade battery cell, preventing direct contact between the cover plates and the battery cell module housing or other metal components, thus avoiding the risk of short circuits. Furthermore, the spacing between the clearance opening and the annular indentation ensures the structural strength of the insulating patch itself. This prevents the insulating patch from tearing or breaking in that area due to the clearance opening being too close to the annular indentation, ensuring the long-lasting and stable insulation effect of the insulating patch on the cover plate.

[0052] It is understandable that when cell 101 is a blade cell, the terminal 104 on one of the cover plates 102 is the positive terminal, and the terminal 104 on the other cover plate 102 is the negative terminal.

[0053] According to one embodiment of this utility model, the battery cell 101 is a square battery cell, and a pair of terminals 104 are provided on the cover plate 102. An explosion-proof valve 103 is located between the pair of terminals 104. Multiple cover plates 102 are located on the same side, and an insulating patch 2 is bonded to the cover plates 102 of the multiple battery cells 101 and extends partially to the periphery of the battery cell module 1. It can be understood that the explosion-proof valve 103 is located between the pair of terminals 104, which means that the clearance opening 204 is spaced apart from the annular indentation 201 on the insulating patch 2. In this way, sufficient connection area is maintained between the clearance opening 204 and the annular indentation 201 of the insulating patch 2, which enhances the structural stability of the insulating patch 2, prevents tearing due to insufficient local strength, and ensures a long-lasting and reliable insulation protection effect for the cover plate 102.

[0054] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: Box; The battery cell module includes multiple battery cells arranged along the Y direction inside the housing; along the X direction, the ends of the battery cells are provided with cover plates, and the cover plates are provided with terminals and explosion-proof valves; An insulating patch is disposed at one end of the battery cell module and extends to the periphery of the battery cell module. The insulating patch is bonded to the cover plates of multiple battery cells. The insulating patch has clearance openings that correspond one-to-one with multiple terminals. Part of the terminal extends out of the corresponding clearance opening. The insulating patch also has annular indentations that correspond one-to-one with multiple explosion-proof valves.

2. The battery pack according to claim 1, characterized in that, Along the X direction, the orthographic projection of the annular indentation toward the explosion-proof valve coincides with the outer peripheral edge of the corresponding explosion-proof valve, or the orthographic projection of the annular indentation toward the explosion-proof valve surrounds the outer peripheral edge of the orthographic projection of the corresponding explosion-proof valve.

3. The battery pack according to claim 1, characterized in that, The annular indentation is an annular groove provided on the side of the insulating patch away from the cover plate; along the X direction, the groove depth of the annular groove is 1 / 2 to 2 / 3 of the thickness of the insulating patch.

4. The battery pack according to claim 1, characterized in that, The annular indentation divides the insulating patch into a main body and an opening section. The opening section is positioned opposite to the explosion-proof valve and has an exhaust port.

5. The battery pack according to claim 4, characterized in that, The vent is located between the end of the opening portion in the length or width direction of the explosion-proof valve and the edge of the corresponding annular indentation. The length L0 of the vent is 0.5 mm to 1.5 mm along the length or width direction of the explosion-proof valve.

6. The battery pack according to any one of claims 1 to 5, characterized in that, Along the X direction, the length L of the insulating patch located on the periphery of the battery cell module is 5mm to 10mm.

7. The battery pack according to any one of claims 1 to 5, characterized in that, The thickness T of the insulating patch is 80 μm to 110 μm.

8. The battery pack according to any one of claims 1 to 5, characterized in that, The insulating patch is made of polyethylene terephthalate.

9. The battery pack according to any one of claims 1 to 5, characterized in that, The battery cell is a blade battery cell. Along the X direction, the battery cell has a cover plate at both ends. One of the cover plates has an explosion-proof valve, and the other cover plate has a liquid injection hole. Along the Y direction, the explosion-proof valve and the liquid injection hole of two adjacent battery cells are alternately arranged. The insulating patch is a pair. The pair of insulating patches are respectively bonded to both ends of the battery cell module in the X direction and partially extend to the periphery of the battery cell module. The clearance opening on each insulating patch is spaced apart from the annular indentation.

10. The battery pack according to any one of claims 1 to 5, characterized in that, The battery cell is a square battery cell. A pair of terminals are provided on the cover plate. The explosion-proof valve is located between the pair of terminals. Multiple cover plates are located on the same side. The insulating patch is adhered to the cover plates of multiple battery cells and extends partially to the periphery of the battery cell module.

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