Battery assembly

Abstract

The utility model relates to power battery technical field provides a kind of battery assembly, the battery assembly includes: electrode cover plate, pole core, shell, explosion-proof valve and insulating support piece;Shell includes N end face, N is positive integer;Shell is fixedly connected with electrode cover plate, to constitute battery shell;Pole core and insulating support piece are located in battery shell;Electrode cover plate is connected to at least one end of pole core;Explosion-proof valve is located on the non-maximum end face in N end face;Electrode cover plate and explosion-proof valve are located in different end face;Insulating support piece is located between explosion-proof valve and pole core;Insulating support piece is equipped with first opening;Explosion-proof valve has valve sheet, inlet and outlet;First opening is communicated with inlet, and outlet is away from pole core;Valve sheet is located between inlet and outlet;When the pressure difference of inlet and outlet is less than or equal to threshold value, valve sheet is in closed form;When the pressure difference of inlet and outlet is greater than threshold value, valve sheet is in open form.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery assembly. Background Technology

[0002] In related technologies, both the explosion-proof valve and the terminals are located on the top cover of the battery. When the battery reaches a high temperature due to overcharging, discharging, or a short circuit, the explosion-proof valve will automatically open to release the high-temperature gas and liquid accumulated inside the battery. However, this process may cause the high-temperature gas and liquid to directly contact the terminals, electrical connectors, or sampling lines above the electrode cover, leading to electrical short circuits and arcing, greatly increasing the risk of battery fire. Therefore, it is urgent to improve these issues. Utility Model Content

[0003] The purpose of this invention is to provide a battery assembly, wherein the method is used to prevent the high-temperature gas and high-temperature liquid released by the explosion-proof valve from directly contacting the electrode cover plate.

[0004] In a first aspect, this utility model provides a battery assembly, comprising: an electrode cover plate, an electrode core, a housing, an explosion-proof valve, and an insulating support sheet; the housing includes N end faces, where N is a positive integer; the housing is fixedly connected to the electrode cover plate to form a battery casing; the electrode core and the insulating support sheet are located inside the battery casing; the electrode cover plate is connected to at least one end of the electrode core; the explosion-proof valve is located on a non-maximum end face among the N end faces; the electrode cover plate and the explosion-proof valve are located on different end faces; the insulating support sheet is located between the explosion-proof valve and the electrode core; the insulating support sheet has a first opening; the explosion-proof valve has a valve plate, an inlet, and an outlet; the first opening communicates with the inlet, and the outlet is away from the electrode core; the valve plate is located between the inlet and the outlet; when the pressure difference between the inlet and the outlet is less than or equal to a threshold, the valve plate is in a closed state; when the pressure difference between the inlet and the outlet is greater than the threshold, the valve plate is in an open state.

[0005] Optionally, the battery casing is cuboid with six parallel end faces. The six end faces include a first and second parallel end face, a third and fourth parallel end face, and a fifth and sixth parallel end face. The area of ​​each end face satisfies: S1≦S2≦S3; wherein the area of ​​the first and second end faces is S1, the area of ​​the third and fourth end faces is S2, and the area of ​​the fifth and sixth end faces is S3; the explosion-proof valve is located on at least one of the first, second, third, and fourth end faces.

[0006] Optionally, the battery assembly also includes a positive terminal and a negative terminal; both the positive terminal and the negative terminal are fixedly connected to the electrode cover plate; the electrode core includes a positive electrode plate and a negative electrode plate that are isolated from each other; the positive terminal is electrically connected to the positive electrode plate, and the negative terminal is electrically connected to the negative electrode plate.

[0007] Optionally, the number of electrode cover plates is set to 1; both the positive and negative terminals are fixedly connected to the same electrode cover plate; the positive and negative terminals are isolated from each other.

[0008] Optionally, the number of electrode cover plates is set to 2, and the electrode cover plates include a positive electrode cover plate and a negative electrode cover plate; the positive electrode cover plate and the negative electrode cover plate are located at opposite ends of the electrode core; the positive electrode cover plate is fixedly connected to the positive electrode post; the positive electrode post is electrically connected to the positive electrode sheet; the negative electrode cover plate is fixedly connected to the negative electrode post; the negative electrode post is electrically connected to the negative electrode sheet.

[0009] Optionally, the insulating support sheet has a melting point higher than 300°C.

[0010] Optionally, the length of the insulating support sheet is less than or equal to the length of the electrode core; the direction of the length is from the electrode core to the electrode cover plate.

[0011] Optionally, the thickness of the insulating support sheet is 0.1 mm to 1 mm; the thickness extends perpendicularly to the length.

[0012] Optionally, the number of first openings and the number of explosion-proof valves are both several; each first opening is connected to the inlet of at least one explosion-proof valve.

[0013] Optionally, the electrode core can be configured as a wound electrode core or a stacked electrode core; the stacked electrode core includes a positive electrode sheet and a negative electrode sheet arranged in parallel; the wound electrode core includes a positive electrode sheet and a negative electrode sheet wound in a spiral.

[0014] Optionally, the battery assembly also includes an insulating protective layer; the insulating protective layer is connected to the maximum end face of the housing; a second opening is provided on the non-maximum end face of the housing; an explosion-proof valve is fixedly connected to the inside of the second opening; the explosion-proof valve at least partially covers the first opening.

[0015] Optionally, the battery assembly also includes a protective sheet; the protective sheet covers the outlet of the explosion-proof valve and is detachably connected to the outlet of the explosion-proof valve.

[0016] The beneficial effects of this invention are as follows: By positioning the electrode cover and the explosion-proof valve on different end faces, the explosion-proof valve is kept away from the electrode cover, preventing the high-temperature gas and liquid released from the explosion-proof valve from directly contacting the electrode cover. This reduces electrical short circuits and arc discharge, lowering the risk of battery fire. Furthermore, positioning the explosion-proof valve on a non-maximum end face among the N end faces prevents the high-temperature gas and liquid released from the explosion-proof valve from directly contacting components outside the maximum end face, facilitating safe battery deployment. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of a battery assembly provided by this utility model; Figure 2 Provided by this utility model Figure 1Enlarged schematic diagram of the structure at point A; Figure 3 A three-dimensional structural diagram of a battery assembly provided by this utility model; Figure 4 A schematic diagram of the structure of an insulating support sheet provided by this utility model; Figure 5 This utility model provides a structural schematic diagram of an explosion-proof valve; Figure 6 A schematic diagram of an electrode cover plate with a single through hole and two pole posts provided by this utility model; Figure 7 A schematic diagram of an electrode cover plate with a single through hole and a single pole post provided by this utility model; Figure 8 A schematic diagram of an electrode cover plate with two through holes and two pole posts provided by this utility model; Figure 9 A schematic diagram of the installation structure of a wound pole core provided by this utility model; Explanation of the reference numerals in the figure: 11. Insulating support sheet; 111. First opening; 12. Electrode core; 13. Electrode cover plate; 14. Through hole; 15. Explosion-proof valve; 151. Inlet; 152. Valve plate; 153. Outlet; 16. Protective plate; 17. Housing; 181. Positive electrode post; 182. Negative electrode post; 19. Insulating seal. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in 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, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, but does not exclude other elements or objects.

[0019] In response to the problems existing in the current technology, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the first embodiment of this utility model provides a battery assembly, including: an electrode cover plate 13, an electrode core 12, a housing 17, an explosion-proof valve 15, and an insulating support sheet 11; the housing 17 includes N end faces, where N is a positive integer; the housing 17 is fixedly connected to the electrode cover plate 13 to form a battery casing; the electrode core 12 and the insulating support sheet 11 are located inside the battery casing; the electrode cover plate 13 is connected to at least one end of the electrode core 12; the explosion-proof valve 15 is located on the non-largest end face among the N end faces; the electrode cover plate 13 and the explosion-proof valve 15 are located on... The same end face; the insulating support plate 11 is located between the explosion-proof valve 15 and the pole core 12; the insulating support plate 11 is provided with a first opening 111; the explosion-proof valve 15 has a valve plate 152, an inlet 151 and an outlet 153; the first opening 111 is connected to the inlet 151, and the outlet 153 is away from the pole core 12; the valve plate 152 is located between the inlet 151 and the outlet 153; when the pressure difference between the inlet 151 and the outlet 153 is less than or equal to the threshold, the valve plate 152 is in a closed state; when the pressure difference between the inlet 151 and the outlet 153 is greater than the threshold, the valve plate 152 is in an open state.

[0020] In this embodiment, by positioning the electrode cover plate 13 and the explosion-proof valve 15 on different end faces, the explosion-proof valve 15 is kept away from the electrode cover plate 13. This prevents the high-temperature gas and liquid released from the explosion-proof valve 15 from directly contacting the electrode cover plate 13, thereby reducing electrical short circuits and arc discharge, and lowering the risk of battery fire. Furthermore, positioning the explosion-proof valve 15 on a non-maximum end face among the N end faces prevents the high-temperature gas and liquid released from the explosion-proof valve 15 from directly contacting components outside the maximum end face, facilitating safe battery deployment.

[0021] Specifically, the explosion-proof valve 15 is a mechanical explosion-proof valve. When the pressure difference between the internal pressure of the battery and the external air pressure exceeds a threshold, the valve plate 152 will rupture due to the pressure difference, thereby releasing the excessive pressure inside the battery. The threshold is a positive value. Because its working principle directly relies on mechanical action and does not require additional energy supply or a complex control system, it has high reliability and response speed.

[0022] In other specific embodiments, the explosion-proof valve 15 is an electronic explosion-proof valve 15. The electronic explosion-proof valve 15 also includes an electronic sensor and an actuator. The electronic sensor monitors the internal pressure of the battery. When the internal pressure exceeds a threshold, the actuator drives the valve plate 152 to move or deform, thereby releasing the excessive pressure within the battery. The electronic explosion-proof valve 15 can be tightly integrated with a Battery Management System (BMS) to achieve data sharing and collaborative operation. For example, when an abnormal situation is detected, not only can the explosion-proof valve 15 be triggered, but the BMS can also notify operators or implement other preventative measures. In extreme climatic conditions or situations requiring precise control of pressure changes, the electronic explosion-proof valve 15 provides better performance than the mechanical explosion-proof valve 15.

[0023] In some specific embodiments, both the drive unit and the electronic sensor are powered by an additional battery independent of the main power battery. By using an independent additional battery to power the drive unit and sensor of the electronic explosion-proof valve 15, the normal operation of the explosion-proof valve 15 can be avoided when the main power battery is too low, thus improving the overall safety and reliability of the battery. In this embodiment, both the drive unit and the electronic sensor use the main power battery as their power source, eliminating the need for an additional independent power supply. This simplifies the overall power wiring structure of the battery, improves the battery integration level, and facilitates lightweight and space-optimized battery design.

[0024] In some specific embodiments, both the drive unit and the electronic sensor are powered by a battery. In some examples, the drive unit is an actuator, motor, or electromagnet.

[0025] Please refer to Figure 3 In some embodiments, the battery casing is cuboid with six parallel end faces. The six end faces include a first and second parallel end face, a third and fourth parallel end face, and a fifth and sixth parallel end face. The area of ​​each end face satisfies: S1≦S2≦S3; wherein the area of ​​the first and second end faces is S1, the area of ​​the third and fourth end faces is S2, and the area of ​​the fifth and sixth end faces is S3. The explosion-proof valve 15 is located on at least one of the first, second, third, and fourth end faces.

[0026] In some examples, the explosion-proof valve 15 is located on the first end face, and the electrode cover plate 13 is located on at least one of the second, third, fourth, fifth, and sixth end faces. The second end face is located in the Z direction of the electrode core 12, and the first end face is located in the opposite Z direction of the electrode core 12; the third end face is located in the X direction of the electrode core 12, and the fourth end face is located in the opposite X direction of the electrode core 12; the fifth end face is located in the Y direction of the electrode core 12, and the sixth end face is located in the opposite Y direction of the electrode core 12; the positive electrode cover plate is located on the fifth end face, and the negative electrode cover plate is located on the fifth end face.

[0027] In other examples, the explosion-proof valve 15 is located on the second end face, and the electrode cover plate 13 is located on at least one of the first, third, fourth, fifth, and sixth end faces.

[0028] This embodiment, by rationally arranging the positions of the electrode cover plate 13 and the explosion-proof valve 15, can better control the temperature distribution during battery operation, promote effective heat dissipation, and reduce the risk of failure caused by local overheating.

[0029] In some embodiments, the battery assembly further includes a positive electrode post 181 and a negative electrode post 182; both the positive electrode post 181 and the negative electrode post 182 are fixedly connected to the electrode cover plate 13; the electrode core 12 includes a positive electrode plate and a negative electrode plate that are isolated from each other; the positive electrode post 181 is electrically connected to the positive electrode plate, and the negative electrode post 182 is electrically connected to the negative electrode plate.

[0030] Specifically, an insulating membrane is provided between the positive and negative electrode plates, and the area of ​​the insulating membrane is larger than the area of ​​either the positive or negative electrode plate. The insulating membrane is used to prevent direct contact between the positive and negative electrode plates, thus preventing short circuits inside the battery.

[0031] In other specific embodiments, the power battery is configured as a lithium-ion battery or a sodium-ion battery.

[0032] In some examples, the positive electrode of the lithium-ion battery is made of one or more of the following materials: lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium manganese oxide, and lithium iron manganese phosphate. Lithium-ion batteries have advantages such as high energy density, long cycle life, and mature technology, making them suitable for applications with high energy density requirements, such as electric vehicles and high-end energy storage systems.

[0033] In some specific embodiments, the positive electrode of the sodium-ion battery is prepared using one or more combinations of layered transition metal oxides, polyanionic oxides, and tunnel oxides. Due to the abundance and low cost of sodium resources, sodium-ion batteries have significant cost advantages and sustainable development potential in areas such as low-speed electric vehicles, large-scale energy storage, and grid peak shaving.

[0034] This embodiment enhances the adaptability and flexibility of the battery system by providing two optional battery system options, enabling it to meet the needs of different application scenarios. By rationally combining cathode materials, such as using lithium iron phosphate and lithium iron manganese phosphate in combination, a balance can be achieved between energy density, voltage platform, and thermal stability of the battery.

[0035] It is worth noting that lithium-ion batteries are made from one or more of the following materials: graphite, silicon, and lithium titanate. Sodium-ion batteries are made from one or more of the following materials: carbon materials, alloys, metal oxides, and metal sulfides.

[0036] like Figure 6 As shown, in some embodiments, the number of electrode cover plates 13 is set to 1; the positive electrode post 181 and the negative electrode post 182 are both fixedly connected to the same electrode cover plate 13; the positive electrode post 181 and the negative electrode post 182 are isolated from each other.

[0037] Specifically, the positive terminal 181 and the negative terminal 182 are provided with an insulating seal 19, which is used to keep the positive terminal 181 and the negative terminal 182 insulated and isolated to prevent the battery from short-circuiting.

[0038] In other specific embodiments, the electrode cover plate 13 is configured as an insulating material plate with two through holes 14, and the positive electrode post 181 and the negative electrode post 182 are fixed in the two through holes 14.

[0039] In some specific embodiments, the electrode cover plate 13 is configured as a metal material plate with through holes 14, and insulating seals 19 are fixed on the outer periphery of the positive electrode post 181 and the outer periphery of the negative electrode post 182, and the insulating seals 19 are fixed in the through holes 14.

[0040] like Figure 7 As shown, in some examples, the metal material plate has a single through hole 14, and both the positive terminal 181 and the negative terminal 182 are fixed to the same insulating seal 19, which is fixed within the single through hole 14. The insulating seal 19 is made of insulating adhesive.

[0041] like Figure 8 As shown, in some other examples, the metal material plate is provided with two through holes 14, the positive terminal 181 is fixed in the first insulating seal 19, and the negative terminal 182 is fixed in the second insulating seal 19. The first insulating seal 19 and the second insulating seal 19 are fixed in the two through holes 14 in a one-to-one correspondence.

[0042] It is worth noting that whether the through-hole 14 is used in conjunction with the insulating seal 19, or the positive and negative terminals 182 are fixed within the same or different insulating seals 19, these designs ensure electrical isolation between the positive terminal 181 and the negative terminal 182, effectively preventing short circuits. The single electrode cover 13 design reduces the number of components, simplifies the overall battery structure, and lowers production costs. The use of the insulating seal 19 not only provides the necessary electrical isolation but also enhances the overall sealing of the battery, preventing electrolyte leakage or the ingress of external impurities, and improving the battery's adaptability to harsh environments.

[0043] In some embodiments, the number of electrode cover plates 13 is set to 2, and the electrode cover plate 13 includes a positive electrode cover plate and a negative electrode cover plate; the positive electrode cover plate and the negative electrode cover plate are located at opposite ends of the electrode core 12; the positive electrode cover plate is fixedly connected to the positive electrode post 181; the positive electrode post 181 is electrically connected to the positive electrode sheet; the negative electrode cover plate is fixedly connected to the negative electrode post 182; the negative electrode post 182 is electrically connected to the negative electrode sheet.

[0044] Specifically, the positive electrode is welded to the positive electrode post 181; the negative electrode is welded to the negative electrode post 182.

[0045] In some embodiments, the melting point of the insulating support sheet 11 is higher than 300°C.

[0046] In some examples, the insulating support sheet 11 is set as a ceramic sheet.

[0047] In other examples, the insulating support sheet 11 is a mica sheet.

[0048] In some other examples, the insulating support sheet 11 is a quartz sheet.

[0049] It is worth noting that this embodiment adopts a design with separate positive and negative electrode covers, which not only helps to simplify the internal layout of the battery, but also makes better use of the space in the battery casing 17, making the entire battery structure more compact and efficient. Since the explosion-proof valve 15 is located on the non-maximum end face, the gap between the explosion-proof valve 15 and the electrode core 12 is small. When the battery needs to vent, the small gap provides a small venting channel. The insulating support plate 11 has a melting point higher than 300°C, which ensures that the insulating support plate 11 will not melt and block the venting channel under high battery conditions, thus ensuring the normal pressure relief of the explosion-proof valve 15.

[0050] In some embodiments, the length of the insulating support sheet 11 is less than or equal to the length of the electrode core 12; the direction of the length extension is the direction in which the electrode core 12 points toward the electrode cover plate 13.

[0051] In some examples, the length extends in the Y direction.

[0052] Specifically, the length of the insulating support sheet 11 is less than the length of the electrode core 12, meaning that the insulating support sheet 11 partially covers the electrode core 12. This embodiment, by setting the insulating support sheet 11 to partially cover the electrode core 12, helps reduce battery weight and size, and improves battery energy density. The partial coverage also helps improve gas-liquid circulation inside the battery, promotes effective heat dissipation, and prevents localized overheating, thereby improving battery safety and lifespan.

[0053] In some embodiments, the thickness of the insulating support sheet 11 is 0.1 mm to 1 mm; the thickness extends in a direction perpendicular to the length.

[0054] In some examples, the thickness extends in the Z direction.

[0055] In some examples, the thickness of the insulating support sheet 11 is 0.1 mm; in other examples, the thickness of the insulating support sheet 11 is 1 mm; and in still other examples, the thickness of the insulating support sheet 11 is 0.5 mm.

[0056] It is worth noting that the thickness of the insulating support sheet 11 is reasonably set in this embodiment to ensure sufficient strength to support the entire electrode core 12, and to maintain structural integrity and provide a good exhaust path when the battery enters a high temperature state.

[0057] In some embodiments, the number of first openings 111 and the number of explosion-proof valves 15 are both several; each first opening 111 is connected to the inlet 151 of at least one explosion-proof valve 15.

[0058] Specifically, the number of first openings 111 is the same as the number of explosion-proof valves 15, and several first openings 111 are connected to several inlets 151 of explosion-proof valves 15 one by one.

[0059] In other specific embodiments, the number of first openings 111 is less than the number of explosion-proof valves 15; wherein, the inlets 151 of multiple explosion-proof valves 15 are connected to the same first opening 111. When multiple explosion-proof valves 15 share the same first opening 111, reasonable design can ensure that even if one explosion-proof valve 15 is blocked, the remaining explosion-proof valves 15 can still work effectively, ensuring the redundancy and stability of the system.

[0060] In some examples, multiple explosion-proof valves 15 include a first explosion-proof valve 15 and a second explosion-proof valve 15 distributed on the same end face, wherein the threshold of the first explosion-proof valve 15 is lower than the threshold of the second explosion-proof valve 15. When the pressure inside the battery continues to increase, the valve plate 152 of the first explosion-proof valve 15 changes from a closed state to an open state before the valve plate 152 of the second explosion-proof valve 15.

[0061] In other examples, multiple explosion-proof valves 15 are distributed on different end faces of the first explosion-proof valve 15 and the second explosion-proof valve 15. This arrangement allows the battery to vent from multiple directions, which helps to avoid the end face where a certain explosion-proof valve 15 is located being squeezed, causing the venting to be blocked and resulting in excessive pressure inside the battery, thus enhancing the safety of the battery.

[0062] It is worth noting that by setting multiple explosion-proof valves 15 with different opening thresholds, different explosion-proof valves 15 can be activated sequentially to release pressure in stages as the internal pressure of the battery gradually increases. This design can more precisely control the internal pressure level of the battery and avoid safety hazards caused by a large amount of gas released at once. By precisely setting the opening threshold of each explosion-proof valve 15, unnecessary activation of the explosion-proof valve 15 can be reduced, extending its service life and also reducing maintenance costs caused by frequent activation.

[0063] In some embodiments, the electrode core 12 is configured as a wound electrode core 12 or a stacked electrode core 12; the stacked electrode core 12 includes a positive electrode sheet and a negative electrode sheet arranged in parallel; the wound electrode core 12 includes a positive electrode sheet and a negative electrode sheet wound in a spiral.

[0064] Please refer to Figure 3 In some specific embodiments, the stacked electrode core 12 includes a P-layer positive electrode and a P-layer negative electrode, where P is a positive integer. The stacking direction of the stacked electrode core 12 is perpendicular to the orientation of the first opening 111, so that the gas generated by the battery at high temperature can be smoothly discharged through the gap between the positive and negative electrode through the first opening 111 and the explosion-proof valve 15.

[0065] In some examples, the stacking direction is the X direction.

[0066] like Figure 9 As shown in some other specific embodiments, multiple wound electrode cores 12 are provided. The multiple wound electrode cores 12 are distributed in an array between the positive electrode cover plate and the negative electrode cover plate.

[0067] It is worth noting that the stacked electrode core 12, due to its interlayer structure characteristics, has better heat conduction than the traditional wound structure, which is more conducive to the uniform diffusion of heat. Combined with the optimized exhaust path of the first opening 111 and the explosion-proof valve 15, some heat can be discharged with the gas in the early stage of battery heating, preventing local overheating from causing a chain reaction. This embodiment, by setting the electrode core 12 as a wound or stacked structure and optimizing its relative positional relationship with the first opening 111, explosion-proof valve 15 and other safety components according to its structural characteristics, not only improves the battery's safety, thermal management capability and energy density, but also enhances its manufacturing compatibility and application adaptability.

[0068] like Figure 1 and Figure 2 As shown, the battery assembly also includes an insulating protective layer (not shown in the figure); the maximum end face of the housing 17 is connected to the insulating protective layer; a second opening is provided on the non-maximum end face of the housing 17; an explosion-proof valve 15 is fixedly connected to the inside of the second opening; the explosion-proof valve 15 at least partially covers the first opening 111.

[0069] Specifically, an insulating protective layer covers the outside of the housing 17.

[0070] In other embodiments, the shape of the second opening matches the shape of the explosion-proof valve 15, which allows for good venting. The position of this second opening is directly opposite to or partially overlaps with the position of the explosion-proof valve 15, so that the first opening 111 and the explosion-proof valve 15 have at least a partial overlap area, so that the venting passage can be in a straight line, allowing high-temperature gas and high-temperature liquid to be smoothly discharged from the battery.

[0071] It is worth noting that in this embodiment, by setting the second opening on the non-maximum end face of the housing 17, the explosion-proof valve 15 is positioned on the maximum end face, thus preventing the insulating protective layer on the maximum end face from being corroded by contact with high-temperature gas and high-temperature liquid.

[0072] In some embodiments, the battery assembly further includes a protective sheet 16; the protective sheet 16 covers the outlet 153 of the explosion-proof valve 15, and the protective sheet 16 is detachably connected to the outlet 153 of the explosion-proof valve 15.

[0073] In some specific embodiments, when the valve plate 152 is in a closed state, the protective plate 16 remains covering the outlet 153 of the explosion-proof valve 15; when the valve plate 152 is in an open state, the protective plate 16 disengages from the outlet 153 of the explosion-proof valve 15 to prevent the exhaust of the explosion-proof valve 15 from being blocked.

[0074] In some examples, the protective plate 16 is adhered to the outlet 153 of the explosion-proof valve 15, while in other examples, the protective plate 16 is negatively adsorbed onto the outlet 153 of the explosion-proof valve 15.

[0075] By incorporating a detachable protective plate 16 that automatically disengages when the explosion-proof valve 15 is opened, the exhaust efficiency and response reliability of the explosion-proof valve 15 are improved, while the safety and durability of the battery in complex environments are also enhanced. This design eliminates the need for complex drive or control systems; the automatic detachment of the protective plate 16 is achieved solely through the airflow impact or mechanical linkage when the valve plate 152 of the explosion-proof valve 15 is opened. The structure is simple, reliable, and easy to mass-produce and apply.

[0076] Although the embodiments of this utility model have been described in detail above, it will be apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations fall within the scope and spirit of this utility model. Moreover, the utility model described herein may have other embodiments and can be implemented or realized in various ways.

Claims

1. A battery assembly, characterized in that, include: Electrode cover plate, electrode core, housing, explosion-proof valve and insulating support plate; the housing includes N end faces, where N is a positive integer; The housing is fixedly connected to the electrode cover to form a battery case; the electrode core and the insulating support sheet are located inside the battery case; The electrode cover plate is connected to at least one end of the electrode core; The explosion-proof valve is located on a non-maximum end face among the N end faces; the electrode cover plate and the explosion-proof valve are located on different end faces; The insulating support sheet is located between the explosion-proof valve and the electrode core; the insulating support sheet has a first opening; The explosion-proof valve has a valve plate, an inlet, and an outlet; The first opening is connected to the inlet, and the outlet is away from the pole core; The valve plate is located between the inlet and the outlet; When the pressure difference between the inlet and the outlet is less than or equal to a threshold, the valve plate is in a closed state; when the pressure difference between the inlet and the outlet is greater than the threshold, the valve plate is in an open state.

2. The battery assembly according to claim 1, characterized in that, The battery casing is rectangular and has six parallel end faces. These six end faces include a first and second parallel end face, a third and fourth parallel end face, and a fifth and sixth parallel end face. The area of ​​each end face satisfies the following condition: S1≦S2≦S3; The area of ​​the first end face and the second end face is S1, the area of ​​the third end face and the fourth end face is S2, and the area of ​​the fifth end face and the sixth end face is S3. The explosion-proof valve is located on at least one of the first end face, the second end face, the third end face, and the fourth end face.

3. The battery assembly according to claim 1, characterized in that, The battery assembly further includes a positive terminal and a negative terminal; both the positive terminal and the negative terminal are fixedly connected to the electrode cover plate; The electrode core includes a positive electrode plate and a negative electrode plate that are isolated from each other; The positive terminal is electrically connected to the positive electrode plate, and the negative terminal is electrically connected to the negative electrode plate.

4. The battery assembly according to claim 3, characterized in that, The number of electrode cover plates is set to 1; The positive terminal and the negative terminal are both fixedly connected to the same electrode cover plate; the positive terminal and the negative terminal are isolated from each other.

5. The battery assembly according to claim 3, characterized in that, The number of electrode cover plates is set to 2, and the electrode cover plates include a positive electrode cover plate and a negative electrode cover plate; the positive electrode cover plate and the negative electrode cover plate are located at opposite ends of the electrode core; The positive electrode cover plate is fixedly connected to the positive electrode post; the positive electrode post is electrically connected to the positive electrode sheet; the negative electrode cover plate is fixedly connected to the negative electrode post; the negative electrode post is electrically connected to the negative electrode sheet.

6. The battery assembly according to claim 1, characterized in that, The melting point of the insulating support sheet is above 300°C.

7. The battery assembly according to claim 1, characterized in that, The length of the insulating support sheet is less than or equal to the length of the pole core; The direction of the length extension is the direction in which the electrode core points towards the electrode cover plate.

8. The battery assembly according to claim 7, characterized in that, The thickness of the insulating support sheet is 0.1 mm to 1 mm; The direction of the thickness extension is perpendicular to the direction of the length extension.

9. The battery assembly according to claim 1 or 2, characterized in that, The number of the first openings and the number of the explosion-proof valves are both several; Each of the first openings is connected to the inlet of at least one of the explosion-proof valves.

10. The battery assembly according to claim 3, characterized in that, The pole core is configured as a wound pole core or a stacked pole core; The stacked electrode core includes a positive electrode and a negative electrode arranged in parallel; The wound electrode core includes a spirally wound positive electrode and a negative electrode.

11. The battery assembly according to claim 1, characterized in that, The battery assembly also includes an insulating protective layer; The insulating protective layer is connected to the maximum end face of the housing. The housing has a second opening on its non-maximum end face; the explosion-proof valve is fixedly connected to the inside of the second opening; The explosion-proof valve at least partially covers the first opening.

12. The battery assembly according to claim 1, characterized in that, The battery assembly also includes a protective sheet; the protective sheet covers the outlet of the explosion-proof valve and is detachably connected to the outlet of the explosion-proof valve.

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