Low-temperature power type lead-acid storage battery power supply device as well as preparation method and application thereof

Abstract

The invention relates to the technical field of lead-acid storage batteries, in particular to a low-temperature power type lead-acid storage battery power supply device as well as a preparation method and application thereof. Comprising a heat-insulation battery box and a matched heat-insulation battery cover, a battery pack formed by connecting a plurality of single batteries is arranged in the heat-insulation battery box, two L-shaped heating grooves are formed in the opposite angles tightly attached to the inner side wall of the heat-insulation battery box, first heating rods are arranged in the L-shaped heating grooves, and interval water grooves are vertically formed between the single batteries in each row; a battery cover heating groove is formed in the heat insulation battery cover, a second heating rod is arranged in the battery cover heating groove, the first heating rod is provided with two sets of power lines, one set is connected with an external power plug, and the other set is connected with the positive electrode and the negative electrode of the battery pack. Through multiple heat insulation design and a surrounding type heating system, the low-temperature performance of the lead-acid storage battery at the temperature of-50 DEG C to 0 DEG C is remarkably improved, and the discharge capacity is larger than or equal to the rated capacity by 90%. The external power supply preferentially supplies power for heating, so that battery energy consumption is reduced; and the industrial problem of insufficient low-temperature endurance is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of lead-acid batteries, and in particular to a low-temperature power type lead-acid battery power supply device, a preparation method and an application thereof. Background Art

[0002] In low-temperature environments (-50 to 0°C), the discharge capacity of lead-acid batteries will be greatly reduced due to the decrease in charging acceptance, which is about 30 to 60% of the discharge capacity in room temperature environments. Vehicles in cold areas (such as electric forklifts and armored vehicles) need to start and work continuously at -50 to 0°C. The existing batteries have insufficient battery life and need to be frequently replaced or preheated, which is inefficient and restricts the application of lead-acid batteries in low-temperature environments.

[0003] The current common solution is to install a heating plate inside the power supply device, monitor the internal temperature of the power supply device in real time during operation, turn on the heating mode when the temperature drops to the set value (0°C), and use battery power to heat the heating plate. The heating plate relies on the battery's own power, resulting in energy cycle loss. The actual discharge capacity is only increased to 50-70% of that at room temperature, which cannot meet the needs of long-term operation.

[0004] Another method is to add a small amount of sodium lignin sulfonate to the negative electrode lead paste formula. The discharge capacity at low temperature is about 60-70% of the discharge capacity at room temperature, and the operation time cannot meet the operation requirements. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a low-temperature power lead-acid battery power supply device that can operate at low temperatures of -50 to 0°C, protect the internal temperature of the battery from being lower than 10°C, and maintain a discharge capacity not lower than the rated capacity.

[0006] The invention also provides a preparation method thereof, which is simple and easy to implement.

[0007] The present invention also provides its application, including two charging methods and a working stabilization maintenance method.

[0008] The low-temperature power type lead-acid battery power supply device described in the present invention includes an insulated battery box and a matching insulated battery cover. A battery pack consisting of several connected single batteries is provided in the insulated battery box. Two L-shaped heating grooves are provided diagonally close to the inner wall of the insulated battery box. A first heating rod is provided in the L-shaped heating groove. A spacer water groove is vertically provided between each row of single batteries. A battery cover heating groove is provided in the insulated battery cover. A second heating rod is provided in the battery cover heating groove. The first heating rod is provided with two sets of power cords, one set is connected to an external power plug, and the other set is connected to the positive and negative poles of the battery pack. In the insulated battery box, a hole with an aperture of 3 mm is opened 5 mm next to the liquid filling port of the single battery located in the middle of the first row. A temperature sensor is provided to connect to the vehicle central control system. The temperature detected by the temperature signal line is the core temperature of the battery; a temperature sensor is provided in the spacer water groove of the first row.

[0009] Furthermore, the heat-insulating battery box body is composed of three layers of materials, namely, a battery box plastic layer, a battery box heat-insulating layer, and a battery box metal layer from the inside to the outside. The battery box heat-insulating layer is made of B1 grade rubber-plastic insulation cotton material.

[0010] Furthermore, the heat-insulating battery cover body is composed of three layers of materials, which are, from the inside to the outside, a battery cover plastic layer, a battery cover heat-insulating layer, and a battery cover metal layer.

[0011] The bottom of the thermally insulated battery box is provided with a forklift hole. The forklift hole design improves the convenience of transportation and is suitable for large equipment application scenarios.

[0012] Furthermore, the heat-insulating battery box is provided with a first heating tank power line outlet and a battery power line outlet, and the heat-insulating battery cover is provided with a second heating tank power line outlet.

[0013] Furthermore, the single battery is composed of an inner battery compartment, an insulating battery compartment, and an outer battery compartment from the inside to the outside, and a matching inner compartment cover, an insulating cover, and an outer compartment cover are provided on the upper part thereof. The inner compartment cover, the insulating cover, and the outer compartment cover are provided with corresponding pole openings and liquid filling ports. The pole openings are covered by sealing rings, and the liquid filling ports are covered by liquid filling caps. A battery structure is provided inside the inner battery compartment.

[0014] The inner and outer battery compartments, inner and outer compartment covers are made of PP. The thermal insulation battery compartment and cover are made of B1 grade rubber-plastic insulation material.

[0015] The thickness of the battery box insulation layer and the battery cover insulation layer is 5-10mm.

[0016] Furthermore, the liquid filling cover is horizontally provided with an annular groove, a matching O-ring is provided in the annular groove, a number of sealing protrusions are provided at the bottom of the liquid filling cover, a limit platform is provided on the outer edge of the liquid filling cover located above the O-ring, a platform is provided inside the liquid filling cover corresponding to the bottom of the limit platform, a heat insulation plate is provided on the platform, and the height of the heat insulation plate corresponds to the height position of the limit platform.

[0017] The sealing protrusion and the O-ring are made of elastic materials, the platform is made of plastic material, and the heat insulation sheet is made of B1 grade rubber-plastic insulation cotton.

[0018] The center of the sealing ring is a heat-insulating ring, and the outer periphery is a sealing elastomer. The heat-insulating ring is a heat-insulating material, preferably B1 grade rubber-plastic insulation cotton, and the sealing elastomer is preferably rubber.

[0019] The inner cavity thickness of the spacer water tank is 5 to 10 mm; the inner cavity thickness of the L-shaped heating tank is 25 to 35 mm, and the L-shaped hot water tank surrounds the battery pack (the length of one end is slightly larger than that of a single column of batteries, and the length of the other end is slightly larger than that of a single row of batteries; the first heating rod is arranged in the water tank in the width direction of the battery); the battery cover heating tank is a rectangular hot water tank with an inner cavity thickness of 25 to 35 mm.

[0020] Furthermore, the L-shaped heating groove is provided with a plurality of connecting protrusions parallel to the direction of a single battery column, and connecting concave cavities are provided at both ends of the spacer water groove, and the connecting protrusions and the connecting concave cavities are adapted to each other.

[0021] The method for preparing the low-temperature power type lead-acid battery power supply device of the present invention comprises the following steps:

[0022] 1) Preparation of a single battery:

[0023] Nest the outer battery tray, the heat-insulating battery tray, and the inner battery tray in sequence, and heat-melt seal the gaps between the three layers to form a closed space. Then, cover them with the matching inner tray cover, the heat-insulating cover, and the outer tray cover in sequence, and heat-melt seal the gaps between the three layers to form a closed space. Cover the pole port with the sealing ring, and cover the liquid injection port with the liquid injection cover.

[0024] Assemble the formed positive and negative plates into a battery group, install them into the inner battery tank, and seal the cover; fill the gaps between the poles and the pole openings with rubber rings;

[0025] Open the filling cap and inject sulfuric acid solution into the inner battery compartment through the filling port for initial charging. After completion, close the filling cap.

[0026] The thickness of the outer battery tank, inner battery tank, inner tank cover and outer tank cover are all 3mm, the thickness of the heat-insulating battery tank and heat-insulating cover is 3-5mm, and the thickness of the heat-insulating sheet in the liquid filling cover is 3-5mm.

[0027] 2) Preparation of thermal insulation battery box:

[0028] A battery box insulation layer is set close to the metal layer of the battery box, and a battery box plastic layer is set close to the insulation layer of the battery box. The gaps between the three layers are hot-melt sealed to form a closed space. Then, two L-shaped heating grooves are set diagonally close to the plastic layer of the battery box. Then, through the cooperation of the connecting protruding teeth and the connecting grooves, several parallel spacer water grooves are inserted from top to bottom. The power cord of the first heating rod is straightly discharged from the power cord outlet of the first heating groove. The height of the L-shaped heating groove and the spacer water groove is consistent with the depth of the inner layer of the thermal insulation battery box.

[0029] 3) Preparation of thermal insulation battery cover:

[0030] A battery cover insulation layer is arranged close to the metal layer of the battery cover, and a battery cover plastic layer is arranged close to the battery cover insulation layer. The gaps between the three layers are sealed by hot melt to form a closed space. A battery cover heating tank is placed in the inner cavity of the insulation battery cover, and the power cord of the second heating rod is smoothly discharged from the power cord outlet of the second heating tank.

[0031] 4) Assembly;

[0032] Place individual batteries in an insulated battery box. Use cables to firmly connect individual batteries to form a battery pack. Each row is separated by a spacer water trough. The spacer water trough and the outer L-shaped heating trough are close to the battery pack. The positive and negative wires of the battery pack are respectively discharged from the two battery power line outlets. The temperature sensor installed next to the filling port of the individual battery in the middle of the first row is connected to the vehicle's central control system. The temperature detected by the temperature signal line is the battery core temperature. Then buckle the insulated battery cover.

[0033] Furthermore, the positive and negative wires of the battery pack are respectively wrapped with insulation material and discharged from two battery power line outlets, ensuring that there is no gap between the battery power line outlet and the positive and negative wires; the power line of the first heating rod is wrapped with insulation material and discharged from the first heating tank power line outlet, ensuring that there is no gap between the first heating tank power line outlet and the power line, and the power line of the second heating rod is wrapped with insulation material and discharged from the second heating tank power line outlet, ensuring that there is no gap between the second heating tank power line outlet and the power line.

[0034] The low-temperature power lead-acid battery power supply device of the present invention is applied to vehicles that require use under temperature conditions of -50 to 0°C. The application method is as follows:

[0035] A) Charging at an operating temperature of -50 to 0°C: First, use an external power charger to charge the first and second heating rods until the temperature of the middle water tank reaches 30 to 50°C. Then, charge the battery until charging is complete.

[0036] B) Room temperature charging: First charge the battery until charging is complete, then use an external power charger to charge the first and second heating rods until the middle water tank temperature reaches 30-50°C;

[0037] C) During use: When the battery core temperature is lower than 10°C, the battery is used to heat the first heating rod until the temperature of the middle water tank reaches 30-50°C.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] (1) The single battery of the present invention adopts a three-layer structure (inner battery compartment, heat-insulating battery compartment, outer battery compartment) and a three-layer cover design, and the middle layer is B1 grade rubber-plastic insulation cotton, which significantly reduces heat conduction.

[0040] (2) The battery box and battery cover of the present invention both adopt a three-layer structure (plastic layer, thermal insulation layer, metal layer) to further reduce heat loss. The hot water heating tank surrounds the outside of the battery to further slow the rate of temperature dissipation inside the battery. The individual batteries and the thermal insulation battery box body (including the box cover) described in the present invention all have thermal insulation capabilities. The heat loss of the battery in a low-temperature environment mainly occurs outside the power box. The double thermal insulation design greatly slows the rate of heat loss.

[0041] (3) Insulation materials (such as O-rings, insulation sheets, and insulation rings) are added to the key components of the present invention such as the liquid filling cap and the sealing ring to achieve local precise insulation.

[0042] (4) The B1-grade rubber and plastic materials used in this invention have both heat-insulating and flame-retardant properties, preventing fires caused by high temperatures or short circuits. PP plastic and rubber materials are corrosion-resistant and age-resistant, and are adaptable to extreme environments.

[0043] (5) The heating rod of the present invention adopts a dual power supply mode (external power supply + battery power supply) with flexible switching to adapt to different working conditions. The heating rod is powered by the external power supply first, reducing battery power consumption and extending the working time;

[0044] The power supply device of the present invention works in an environment of not less than -20°C, does not need to rely on battery power for heating, and under the same conditions, the battery discharge capacity is used for power output, thereby ensuring the operating time;

[0045] The power supply device of the present invention operates in an environment not higher than -20°C, and has a slower dissipation rate than the existing technical solution. It only needs to rely on the battery power to maintain the temperature inside the device not lower than 10°C. Under the same conditions, the operating time is guaranteed.

[0046] (6) The present invention achieves a discharge capacity close to the rated capacity (≥90%) under a -50 to 0°C environment through the synergistic effect of heating and heat insulation, far exceeding the 30 to 70% of traditional lead-acid batteries.

[0047] (7) The L-shaped heating tank and the spacer water tank of the present invention use connecting protrusions and concave cavities to facilitate assembly and maintenance. The multiple sealing features of the liquid filling cover, including sealing protrusions, O-rings, and limiters, prevent electrolyte leakage and cold air intrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings described herein are intended to provide a further understanding of the present invention and constitute a part of the present invention. In the accompanying drawings:

[0049] Figure 1 A top view of the assembled insulated battery box and its interior according to the present invention;

[0050] Figure 2 This is a disassembled diagram of a single battery according to the present invention;

[0051] Figure 3 This is a schematic structural diagram of the liquid filling cap of the present invention;

[0052] Figure 4 Schematic diagram of the structure of the sealing ring of the present invention;

[0053] Figure 5 This is a front view of the L-shaped heating tank of the present invention;

[0054] Figure 6 A top view of the L-shaped heating tank according to the present invention;

[0055] Figure 7 This is a right side view of the L-shaped heating tank of the present invention;

[0056] Figure 8 This is a front view of the spacer water tank of the present invention;

[0057] Figure 9 A top view of the spacer water tank according to the present invention;

[0058] Figure 10 This is a front view of the thermal insulation battery box of the present invention;

[0059] Figure 11 This is a right side view of the heat-insulating battery box of the present invention;

[0060] Figure 12 This is a front view of the heat-insulating battery cover of the present invention;

[0061] Figure 13 This is a schematic structural diagram of the battery cover heating tank of the present invention;

[0062] Figure: 1, inner battery compartment; 101, inner compartment cover; 2, thermal insulation battery compartment; 201, thermal insulation cover; 3, outer battery compartment; 301, outer compartment cover; 4, terminal port; 5, liquid filling port; 6, liquid filling cover; 601, platform; 602, thermal insulation sheet; 603, annular groove; 604, O-ring; 605, limiter; 606, sealing protrusion; 7, sealing ring; 701, sealing elastomer; 702, thermal insulation ring; 8, single battery; 9, thermal insulation battery box; 901, battery box plastic layer; 902, battery Battery box insulation layer; 903, battery box metal layer; 10, L-shaped heating trough; 11, first heating rod; 12, spacer water trough; 13, first heating trough power cord outlet; 14, battery power cord outlet; 15, forklift hole; 16, insulation battery cover; 1601, battery cover plastic layer; 1602, battery cover insulation layer; 1603, battery cover metal layer; 17, battery cover heating trough; 1701, second heating rod; 18, connecting convex teeth; 19, connecting concave cavity; 20, second heating trough power cord outlet. DETAILED DESCRIPTION

[0063] The present invention will be further described below with reference to the examples.

[0064] Unless otherwise specified, all raw materials used in the examples are commercially available.

[0065] PP was purchased from Zibo Torch Plastic Products Co., Ltd.

[0066] Example (Model 42-D-440, 7*6 combination)

[0067] like Figure 1-13 As shown, the low-temperature power lead-acid battery power supply device includes an insulating battery box 9 and a matching insulating battery cover 16. The insulating battery box 9 is provided with a battery pack consisting of 42 single batteries 8 connected together, and the battery pack is 7 in a row, with a total of 6 rows. Two L-shaped heating grooves 10 are provided diagonally close to the inner wall of the insulating battery box 9, and three first heating rods 11 are provided in the L-shaped heating grooves 10. A spacing water groove 12 is vertically provided between each row of single batteries 8, and a total of 5 spacing water grooves 12 are provided. A battery cover heating groove 17 is provided in the insulating battery cover 16, and a second heating rod 1701 is provided in the battery cover heating groove 17. The first heating rod 11 is provided with two sets of power cords, one set is connected to the external power plug, and the other set is connected to the positive and negative poles of the battery pack. In the insulating battery box 9, a hole with an aperture of 3mm is opened 5mm next to the filling port 5 of the single battery 8 located in the middle position of the first row, and a temperature sensor is provided to connect to the vehicle central control system. The temperature detected by the temperature signal line is the core temperature of the battery; a temperature sensor is provided in the spacing water groove 12 of the first row.

[0068] It can be understood that the body of the heat-insulating battery box 9 is composed of three layers of materials, namely, a battery box plastic layer 901, a battery box heat-insulating layer 902, and a battery box metal layer 903. The battery box heat-insulating layer 902 is made of B1 grade rubber-plastic heat-insulating cotton material.

[0069] It can be understood that the cover body of the heat-insulating battery cover 16 is composed of three layers of materials, which are, from the inside to the outside, a battery cover plastic layer 1601 , a battery cover heat-insulating layer 1602 , and a battery cover metal layer 1603 .

[0070] The bottom of the thermal insulation battery box 9 is provided with a forklift hole 15. The forklift hole 15 is designed to improve the convenience of transportation and is suitable for large equipment application scenarios.

[0071] It can be understood that the heat-insulating battery box 9 is provided with a first heating tank power line outlet 13 and a battery power line outlet 14 , and the heat-insulating battery cover 16 is provided with a second heating tank power line outlet 20 .

[0072] It can be understood that the single battery 8 is composed of an inner battery compartment 1, an insulating battery compartment 2, and an outer battery compartment 3 from the inside to the outside, and a matching inner compartment cover 101, an insulating cover 201, and an outer compartment cover 301 are provided on the upper part thereof. The inner compartment cover 101, the insulating cover 201, and the outer compartment cover 301 are provided with corresponding pole ports 4 and liquid injection ports 5. The pole port 4 is covered by a sealing ring 7, and the liquid injection port 5 is covered by a liquid injection cover 6. A battery structure is provided inside the inner battery compartment 1.

[0073] The inner battery compartment 1, outer battery compartment 3, inner compartment cover 101, and outer compartment cover 301 are made of PP. The heat-insulating battery compartment 2 and heat-insulating cover 201 are made of B1 grade rubber-plastic insulation cotton material.

[0074] The thickness of the battery box insulation layer 902 and the battery cover insulation layer 1602 is 5 mm.

[0075] It can be understood that the liquid filling cover 6 is horizontally provided with an annular groove 603, and a matching O-ring 604 is provided in the annular groove 603. A number of sealing protrusions 606 are provided at the bottom of the liquid filling cover 6. A limit platform 605 is provided on the outer edge of the liquid filling cover 6 located above the O-ring 604. A platform 601 is provided inside the liquid filling cover 6 corresponding to the lower side of the limit platform 605. A heat insulation plate 602 is provided on the platform 601, and the height of the heat insulation plate 602 corresponds to the height position of the limit platform 605.

[0076] The sealing protrusion 606 and the O-ring 604 are made of elastic materials, the platform 601 is made of PP plastic, and the heat insulation sheet 602 is made of B1 grade rubber-plastic insulation cotton.

[0077] The center of the sealing ring 7 is a heat insulating ring 702, and the outer periphery is a sealing elastic body 701. The heat insulating ring 702 is made of heat insulating material, preferably B1 grade rubber-plastic thermal insulation cotton, and the sealing elastic body 701 is rubber.

[0078] The inner cavity thickness of the spacer water tank 12 is 10mm, and the length dimension is slightly larger than that of a single row of batteries; the inner cavity thickness of the L-shaped heating tank 10 is 30mm, and the L-shaped hot water tank surrounds the battery pack (the length dimension of one end is slightly larger than that of a single row of batteries, and the length dimension of the other end is slightly larger than that of a single row of batteries; the first heating rod 11 is arranged in the water tank in the width direction of the battery); the battery cover heating tank 17 is a rectangular hot water tank with an inner cavity thickness of 30mm.

[0079] It can be understood that the L-shaped heating groove 10 is provided with five connecting protrusions 18 parallel to the direction of the single battery 8 column, and the two ends of the spacer water groove 12 are provided with connecting cavities 19, and the connecting protrusions 18 and the connecting cavities 19 are adapted to each other.

[0080] The method for preparing the low-temperature power type lead-acid battery power supply device comprises the following steps:

[0081] 1) Preparation of a single battery 8:

[0082] The outer battery compartment 3, the heat-insulating battery compartment 2, and the inner battery compartment 1 are nested in sequence, and the gaps between the three layers are sealed by heat-melting to form a closed space. The matching inner compartment cover 101, the heat-insulating cover 201, and the outer compartment cover 301 are sequentially covered, and the gaps between the three layers are sealed by heat-melting to form a closed space. The terminal opening 4 is covered with a sealing ring 7, and the liquid filling port 5 is covered with a liquid filling cover 6;

[0083] Assemble the formed positive and negative plates into a battery group, install them into the inner battery tank 1, and seal the cover; fill the gap between the pole and the pole port 4 with a rubber ring;

[0084] Open the filling cap 6 and inject 1.300g / cm2 of liquid into the battery tank 1 through the filling port 5. 3 Sulfuric acid solution, initial charging, the initial charging current is 0.2C5A, the charging capacity is 5C5Ah, after completion, cover the liquid filling cap 6;

[0085] The thickness of the outer battery compartment 3, inner battery compartment 1, inner compartment cover 101 and outer compartment cover 301 are all 3 mm, the thickness of the heat-insulating battery compartment 2 is 3 mm, the thickness of the heat-insulating cover 201 is 4 mm, and the thickness of the heat-insulating sheet 602 in the liquid filling cover 6 is 5 mm.

[0086] 2) Preparation of thermal insulation battery box 9:

[0087] A battery box insulation layer 902 is set close to the inside of the battery box metal layer 903, and a battery box plastic layer 901 is set close to the battery box insulation layer 902. The gaps between the three layers are hot-melt sealed to form a closed space. Then, two L-shaped heating grooves 10 are set diagonally close to the battery box plastic layer 901. Then, through the cooperation of the connecting protruding teeth 18 and the connecting grooves, several parallel spaced water grooves 12 are inserted from top to bottom. The power cord of the first heating rod 11 is smoothly discharged from the first heating groove power cord outlet 13. The height of the L-shaped heating groove 10 and the spaced water groove 12 is consistent with the depth of the inner layer of the insulated battery box 9;

[0088] 3) Preparation of thermal insulation battery cover 16:

[0089] A battery cover heat insulation layer 1602 is provided close to the battery cover metal layer 1603, and a battery cover plastic layer 1601 is provided close to the battery cover heat insulation layer 1602. The gaps between the three layers are sealed by hot melt to form a closed space. A battery cover heating tank 17 is placed in the inner cavity of the heat-insulating battery cover 16, and the power cord of the second heating rod 1701 is smoothly discharged from the second heating tank power cord outlet 20.

[0090] 4) Assembly;

[0091] A single battery 8 is placed in an insulated battery box 9. The single batteries 8 are connected to form a battery pack with cables. Each row is separated by a spacer water trough 12. The spacer water trough 12 and the outer L-shaped heating trough 10 are close to the battery pack. The positive and negative poles of the battery pack are respectively discharged from the two battery power line outlets 14; the temperature sensor arranged next to the filling port 5 of the single battery 8 in the middle position of the first row is connected to the vehicle's central control system, and the temperature detected by the temperature signal line is the battery core temperature; then the insulated battery cover 16 is buckled.

[0092] It can be understood that the positive and negative wires of the battery pack are respectively wrapped with insulation materials and exit from the two battery power cord outlets 14 respectively, ensuring that there is no gap between the battery power cord outlet 14 and the positive and negative wires; the power cord of the first heating rod 11 is wrapped with insulation materials and exits from the first heating tank power cord outlet 13, ensuring that there is no gap between the first heating tank power cord outlet 13 and the power cord, and the power cord of the second heating rod 1701 is wrapped with insulation materials and exits from the second heating tank power cord outlet 20, ensuring that there is no gap between the second heating tank power cord outlet 20 and the power cord.

[0093] After testing, the low-temperature power lead-acid battery power supply device prepared in this embodiment was left to stand for 4 hours in a -20°C environment, and then subjected to a 5-hour capacity test, and the initial capacity reached a maximum of 105%; the high-rate discharge performance was 34 minutes; and the discharge and charge cycle test in a -20°C environment (first completing the hot water tank heating, then charging the battery, and after the battery charging is completed, the hot water tank is heated to 50°C) showed a cycle endurance of ≥1000 times; the main performance of the battery met the national standard requirements, and the discharge capacity was significantly improved in a low-temperature environment.

[0094] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiments are generally similar to the method embodiments, so the description is relatively simple. For relevant parts, refer to the description of the method embodiments.

[0095] The foregoing is merely an embodiment of the present invention and is not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. A low-temperature power type lead-acid battery power supply device, characterized in that: The invention comprises a heat-insulating battery box (9) and a matching heat-insulating battery cover (16). A battery pack consisting of a plurality of connected single batteries (8) is provided in the heat-insulating battery box (9). Two L-shaped heating grooves (10) are provided diagonally close to the inner wall of the heat-insulating battery box (9). A first heating rod (11) is provided in the L-shaped heating groove (10). A spacer water groove (12) is vertically provided between each row of single batteries (8). A battery cover heating groove (17) is provided in the heat-insulating battery cover (16). A second heating rod (1701) is provided in the battery cover heating groove (17). The first heating rod (11) is provided with two sets of power lines, one set is connected to an external power plug, and the other set is connected to the positive and negative poles of the battery pack. In the heat-insulating battery box (9), a hole is opened next to the liquid injection port (5) of the single battery (8) located in the middle of the first row. A temperature sensor is provided to connect to the vehicle central control system. The temperature detected by the temperature signal line is the battery core temperature. A temperature sensor is provided in the spacer water groove (12) of the first row.

2. The low-temperature power type lead-acid battery power supply device according to claim 1, characterized in that: The body of the heat-insulating battery box (9) is composed of three layers of materials, which are, from the inside to the outside, a battery box plastic layer (901), a battery box heat-insulating layer (902), and a battery box metal layer (903).

3. The low-temperature power type lead-acid battery power supply device according to claim 1, characterized in that: The heat-insulating battery cover (16) is composed of three layers of material, which are, from the inside to the outside, a battery cover plastic layer (1601), a battery cover heat-insulating layer (1602), and a battery cover metal layer (1603).

4. The low-temperature power type lead-acid battery power supply device according to claim 1, characterized in that: The heat-insulating battery box (9) is provided with a first heating tank power line outlet (13) and a battery power line outlet (14), and the heat-insulating battery cover (16) is provided with a second heating tank power line outlet (20).

5. The low-temperature power type lead-acid battery power supply device according to claim 1, characterized in that: The single battery (8) comprises, from the inside to the outside, an inner battery compartment (1), a heat-insulating battery compartment (2), and an outer battery compartment (3), and the upper portions thereof are provided with matching inner compartment covers (101), heat-insulating covers (201), and outer compartment covers (301), respectively. The inner compartment covers (101), heat-insulating covers (201), and outer compartment covers (301) are provided with corresponding pole openings (4) and liquid injection ports (5), the pole openings (4) are covered by sealing rings (7), and the liquid injection ports (5) are covered by liquid injection covers (6), and a battery structure is provided inside the inner battery compartment (1).

6. The low-temperature power type lead-acid battery power supply device according to claim 5, characterized in that: The liquid injection cover (6) is provided with a horizontal annular groove (603), a matching O-ring (604) is provided in the annular groove (603), a plurality of sealing protrusions (606) are provided at the bottom of the liquid injection cover (6), a limiting platform (605) is provided on the outer edge of the liquid injection cover (6) located above the O-ring (604), a platform (601) is provided inside the liquid injection cover (6) corresponding to the lower side of the limiting platform (605), a heat insulating sheet (602) is provided on the platform (601), and the height of the heat insulating sheet (602) corresponds to the height position of the limiting platform (605), the center of the sealing ring (7) is the heat insulating ring (702), and the outer periphery is the sealing elastic body (701).

7. The low-temperature power type lead-acid battery power supply device according to claim 1, characterized in that: The L-shaped heating groove (10) is provided with a plurality of connecting protruding teeth (18) parallel to the direction of the single battery (8) column, and connecting concave cavities (19) are provided at both ends of the spacer water groove (12), and the connecting protruding teeth (18) and the connecting concave cavities (19) are adapted to each other.

8. A method for preparing a low-temperature power type lead-acid battery power supply device according to any one of claims 1 to 7, characterized in that: The following steps are involved: 1) Preparation of a single battery (8): The outer battery tank (3), the heat-insulating battery tank (2), and the inner battery tank (1) are nested in sequence, and the gaps between the three layers are sealed by heat-melting to form a closed space. The inner tank cover (101), the heat-insulating cover (201), and the outer tank cover (301) are covered in sequence, and the gaps between the three layers are sealed by heat-melting to form a closed space. The pole port (4) is covered with a sealing ring (7), and the liquid injection port (5) is covered with a liquid injection cover (6); Assembling the formed positive and negative electrode plates into a battery electrode group, placing them into the inner battery container (1), and sealing the cover; The gap between the pole and the pole opening (4) is filled and sealed with a rubber ring; Open the liquid injection cover (6) and inject sulfuric acid solution into the inner battery compartment (1) through the liquid injection port (5) to perform initial charging. After completion, close the liquid injection cover (6); 2) Preparation of thermal insulation battery box (9): A battery box heat insulation layer (902) is arranged close to the inside of the battery box metal layer (903), and a battery box plastic layer (901) is arranged close to the battery box heat insulation layer (902). The gaps between the three layers are sealed by heat melting to form a closed space. Then, two L-shaped heating grooves (10) are arranged diagonally close to the battery box plastic layer (901). Then, through the cooperation of the connecting protruding teeth (18) and the connecting grooves, a plurality of parallel spacer water grooves (12) are inserted from top to bottom. The power cord of the first heating rod (11) is discharged from the first heating groove power cord outlet (13). The height of the L-shaped heating groove (10) and the spacer water groove (12) is consistent with the depth of the inner layer of the heat-insulating battery box (9); 3) Preparation of thermal insulation battery cover (16): A battery cover heat insulation layer (1602) is arranged close to the inside of the battery cover metal layer (1603), and a battery cover plastic layer (1601) is arranged close to the battery cover heat insulation layer (1602). The gaps between the three layers are sealed by heat melting to form a closed space. A battery cover heating groove (17) is placed in the inner cavity of the heat insulation battery cover (16), and the power cord of the second heating rod (1701) is discharged from the power cord outlet (20) of the second heating groove. 4) Assembly; A single battery (8) is placed in a heat-insulating battery box (9), and the single batteries (8) are connected to form a battery pack with cables. Each row is separated by a spacer water tank (12), and the spacer water tank (12) and the peripheral L-shaped heating tank (10) are close to the battery pack. The positive and negative lines of the battery pack are respectively discharged from two battery power line outlets (14); a temperature sensor is set next to the injection port (5) of the single battery (8) in the middle position of the first row and is connected to the vehicle central control system. The temperature detected by the temperature signal line is the battery core temperature; and then the heat-insulating battery cover (16) is buckled.

9. The method for preparing a low-temperature power type lead-acid battery power supply device according to claim 8, characterized in that: The positive and negative lines of the battery pack are respectively wrapped with heat-insulating materials and are respectively discharged from two battery power line outlets (14), ensuring that there is no gap between the battery power line outlet (14) and the positive and negative lines; the power line of the first heating rod (11) is wrapped with heat-insulating materials and is discharged from the first heating tank power line outlet (13), ensuring that there is no gap between the first heating tank power line outlet (13) and the power line; the power line of the second heating rod (1701) is wrapped with heat-insulating materials and is discharged from the second heating tank power line outlet (20), ensuring that there is no gap between the second heating tank power line outlet (20) and the power line.

10. An application of a low-temperature power type lead-acid battery power supply device according to any one of claims 1 to 7, characterized in that: It is used in vehicles that require use in temperatures between -50 and 0°C. The application method is as follows: A) Charging at a working temperature of -50 to 0°C: First, use an external power charger to charge the first heating rod (11) and the second heating rod (1701), and stop when the temperature of the middle water tank reaches 30 to 50°C. Then, charge the battery until charging is complete; B) Charging at room temperature: first charge the battery until charging is complete, then use an external power charger to charge the first heating rod (11) and the second heating rod (1701) until the temperature of the middle water tank reaches 30-50°C; C) During use: when the core temperature of the battery is lower than 10°C, the battery is used to heat the first heating rod (11) until the temperature of the intermediate water tank reaches 30-50°C.

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