Heat source device of lithium battery device

Abstract

And a lithium battery device heat source device. Relates to the technical field of lithium battery accessory equipment. Comprising a base, a shell and a cover plate, the shell is installed at the top of the base, a lithium battery and a heating unit are placed in the shell, a temperature sensor is further arranged on the base and electrically connected to a controller, a water storage box is arranged in the shell, a partition plate is arranged in the water storage box, a water body is stored below the partition plate, and the water body is electrically connected to the controller. A sleeve is arranged in the middle of the partition plate, a piston and a movable rod are arranged in the sleeve in a penetrating mode, a pressing plate is arranged at the top of the water storage box, a pressure sensor is arranged at the end, away from the piston, of the movable rod, and the pressure sensor is electrically connected with the controller; and after being frozen, water in the water storage box expands towards the interior of the sleeve and jacks and supports the piston. The signal for starting the heating unit can be transmitted to the controller under the condition that the temperature sensor is damaged, so that the overall error-tolerant rate is improved, and the lithium battery can be ensured to be in a working state with proper temperature.

Description

Technical Field

[0001] This application relates to the field of lithium battery accessory equipment technology, specifically to a heat source device for a lithium battery device. Background Technology

[0002] Lithium-ion batteries, as a representative of new energy sources, are widely used in many fields. However, due to the inherent characteristics of lithium-ion battery materials, they have very stringent requirements for operating temperature. Currently, it is difficult to achieve normal high-current start-up and discharge at both high and low temperatures. The actual discharge performance of lithium-ion batteries at low temperatures is far lower than that at room temperature, and it decreases as the temperature drops. Generally, at -20℃, the discharge capacity is only 10% to 20% of that at room temperature, and at -30℃, the discharge capacity is only about 2%.

[0003] Chinese patent document CN222051904U discloses a lithium battery pack with heating function, specifically disclosing a hollow battery pack housing with a separator inside, the separator having a wire groove; a set of batteries disposed within the battery pack housing; symmetrical flexible heating films disposed on one side of each set of batteries and fixedly connected to each set of batteries; at least one temperature sensing probe disposed within the battery pack housing and fixedly connected to the battery pack housing; and a battery management system (BMS) fixedly connected to the separator. The temperature sensing probe, the flexible heating films, and the batteries are electrically connected to the BMS. This invention facilitates the heating and heat preservation of lithium battery packs.

[0004] However, the aforementioned patent relies entirely on a temperature sensing probe for temperature recognition. When the temperature sensing probe is damaged, heating of the battery cannot be performed, resulting in a low fault tolerance rate. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this application provides a heat source device for lithium battery devices.

[0006] This application adopts the following technical solution: a lithium battery device heat source device, including a base, a housing, and a cover plate. The housing is installed on the top of the base. A lithium battery and a heating unit are placed inside the housing. The cover plate is used to seal the housing. A temperature sensor is also provided on the base. The temperature sensor is electrically connected to a controller. The controller is used to control the opening and closing of the heating unit. A water storage box is provided inside the housing. A partition is provided inside the water storage box. Water is stored below the partition. A sleeve is provided in the middle of the partition. A piston and a movable rod pass through the sleeve. The inner wall of the piston fits against the inner wall of the sleeve. The movable rod is located at the top of the piston.

[0007] The top of the water storage box is equipped with a pressure plate, and the end of the movable rod away from the piston is equipped with a pressure sensor. The pressure sensor is electrically connected to the controller. After freezing, the water in the water storage box expands toward the sleeve and supports the piston.

[0008] Optionally, the partition is welded inside the water storage box, dividing the water storage box into complementary upper and lower chambers. The water is disposed in the lower chamber, one end of the sleeve is connected to the lower chamber, and the other end of the sleeve is connected to the top of the water storage box.

[0009] Optionally, the partition is an arc shape that gradually bulges from the periphery to the center, and the inner diameter of the sleeve is smaller than the inner diameter of the water storage box.

[0010] Optionally, the outer wall of the housing is provided with a plurality of waist-shaped heat dissipation holes, which are equidistantly spaced along the vertical direction. The pressure plate is provided with a plurality of waist-shaped through holes, which are spaced apart with the same spacing and direction as the heat dissipation holes. When the bottom of the pressure plate is in contact with the top of the water storage box, the side wall of the pressure plate is in contact with the inner wall of the housing, and the plurality of heat dissipation holes and the plurality of through holes are in a one-to-one correspondence.

[0011] Optionally, the width of the heat dissipation hole is smaller than the minimum distance between two adjacent heat dissipation holes.

[0012] Optionally, the pressure plate has two through holes that penetrate the pressure plate in the vertical direction. A limiting rod is inserted through the through hole. One end of the limiting rod is connected to the bottom inner side of the housing, and the other end of the limiting rod is connected to the top inner side of the housing. The water storage box is located between the two limiting rods.

[0013] Compared with the prior art, this application has the following advantages:

[0014] 1. The piston and moving rod are driven by the freezing of water, which pushes the pressure plate and changes the pressure value transmitted to the pressure sensor. In the event of a failure of the temperature sensor, the signal to start the heating unit can still be transmitted to the controller, which improves the overall fault tolerance and ensures that the lithium battery can be in a suitable operating state.

[0015] 2. By pushing the pressure plate against the movable plate, the connection between the heat dissipation holes and the through holes is changed, so that the shell is in a heat dissipation state connected to the outside when it is at normal or high temperature, and in a heat preservation and heating state isolated from the outside when it is at low temperature. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this application;

[0017] Figure 2 yes Figure 1 Reference diagram of the action state;

[0018] Figure 3 This is a cross-sectional view of the internal structure of the baffle and water storage box;

[0019] Figure 4 yes Figure 3 Reference diagram of the action state;

[0020] In the diagram: 1. Base; 10. Temperature sensor; 2. Housing; 21. Heat dissipation hole; 22. Limiting rod; 23. Baffle; 3. Cover plate; 4. Heating unit; 5. Water storage box; 51. Partition plate; 52. Sleeve; 53. Piston; 54. Movable rod; 55. Pressure sensor; 56. Upper chamber; 57. Lower chamber; 6. Pressure plate; 61. Through hole; 62. Perforation. Detailed Implementation

[0021] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0022] like Figure 1-4 As shown, the lithium battery device heat source includes a base 1, a housing 2, and a cover plate 3. The housing 2 is installed on top of the base 1. The lithium battery and heating unit 4 are placed inside the housing 2. The cover plate 3 is used to seal the housing 2. The base 1 is also equipped with a temperature sensor 10, which is electrically connected to a controller. The controller is used to control the opening and closing of the heating unit 4. The housing 2 is equipped with a water storage box 5. The water storage box 5 is equipped with a partition 51. Water is stored below the partition 51. A sleeve 52 is provided in the middle of the partition 51. A piston 53 and a movable rod 54 pass through the sleeve 52. The inner wall of the piston 53 is in contact with the inner wall of the sleeve 52. The movable rod 54 is located on top of the piston 53. A pressure plate 6 is provided on the top of the water storage box 5. A pressure sensor 55 is provided at the end of the movable rod 54 away from the piston 53. The pressure sensor 55 is electrically connected to the controller. After freezing, the water in the water storage box 5 expands towards the sleeve 52 and pushes against the piston 53.

[0023] When the ambient temperature is below 0°C, the temperature sensor 10 immediately acquires this signal and transmits it to the controller. The controller then controls the heating unit 4 to heat up, thereby maintaining the temperature of the lithium battery inside the casing 2 in a relatively stable state. Simultaneously, the water in the water storage box 5 gradually freezes and expands (i.e., changes from liquid water to solid ice). Since the sleeve 52 is in a relatively open state, the water expands towards the inside of the sleeve 52. During this process, the water exerts a pushing force on the piston 53, allowing the piston 53 and the movable rod 54 to move upwards towards the sleeve 52. As the movable rod 54 moves, it pushes upwards against the pressure plate 6, causing a vertical change in the pressure received by the pressure sensor 55. Upon receiving this signal, the controller also controls the heating unit 4 to heat up, thereby improving the overall fault tolerance and ensuring that the heating unit 4 can reliably control the temperature inside the casing 2. Furthermore, the pressure sensor 55 and the temperature sensor 10 are connected in parallel to ensure that their operation does not interfere with each other.

[0024] A partition 51 is welded inside the water storage box 5, dividing the water storage box 5 into complementary upper chamber 56 and lower chamber 57. The water is located in the lower chamber 57. One end of the sleeve 52 is connected to the lower chamber 57, and the other end of the sleeve 52 is connected to the top of the water storage box 5. The reliable connection between the partition 51 and the water storage box 5 ensures that when the water gradually freezes and expands at low temperatures, the water can move towards the sleeve 52 and reliably push the movable rod 54 to produce displacement.

[0025] The baffle 51 is an arc shape that gradually bulges from the periphery to the center. The inner diameter of the sleeve 52 is smaller than the inner diameter of the water storage box 5. This guides the freezing and expansion process of the water, minimizing the impact on the baffle 51. The inner diameter of the water storage box 5 is much larger than the inner diameter of the sleeve 52, allowing a small amount of water expansion to be converted into a larger range of movement of the movable rod 54. This reliably lifts the pressure plate 6 and applies sufficient pressure to the pressure sensor 55.

[0026] The outer wall of the housing 2 is provided with several waist-shaped heat dissipation holes 21, which are equidistantly spaced in the vertical direction. The pressure plate 6 is provided with several waist-shaped through holes 61, which are spaced at the same intervals and directions as the heat dissipation holes 21. When the bottom of the pressure plate 6 is in contact with the top of the water storage box 5, the side wall of the pressure plate 6 is in contact with the inner wall of the housing 2, and the heat dissipation holes 21 and the through holes 61 are in a one-to-one correspondence. When the lithium battery is in a high-temperature working environment such as summer, the movable rod 54 is completely located inside the sleeve 52. At this time, the bottom of the pressure plate 6 is in contact with the top of the water storage box 5, and the heat dissipation holes 21 and the through holes 61 are in a connected state, which can achieve reliable heat dissipation and prevent the lithium battery from generating excessive temperature rise due to heat accumulation. When the lithium battery is in a low-temperature working environment such as winter, the pressure plate 6, which is displaced by the freezing and expansion of the water, not only exerts pressure on the pressure sensor 55, but also blocks the heat dissipation hole 21. That is, as the pressure plate 6 moves upward, the heat dissipation hole 21 and the through hole 61 change from a one-to-one connected state to a misaligned state. At this time, both the heat dissipation hole 21 and the through hole 61 are in a closed state, which can effectively prevent external cold air from entering the inside of the housing 2. At the same time, it can reduce the speed at which the heat emitted by the heating unit 4 radiates outward, thereby improving the heating effect on the lithium battery inside the housing 2.

[0027] The width of the heat dissipation hole 21 is smaller than the minimum distance between two adjacent heat dissipation holes 21. This reduces the difficulty of changing the state of mutual connection between the heat dissipation hole 21 and the through hole 61 from a state of mutual connection to a state of complete misalignment by moving the pressure plate 6. Furthermore, several baffles 23 are provided inside the housing 2. The baffles 23 are spaced apart and form several placement areas inside the housing 2. The lithium battery is placed in several placement areas. At the same time, the heating unit 4 can be a heating wire, and the heating wire is passed through the baffles 23. In this way, the baffles 23 can heat the lithium battery from different directions, which significantly improves the heating effect. Moreover, the heat from the heating wire is transferred to the lithium battery through the baffles 23, and the heating effect is more uniform.

[0028] The pressure plate 6 has two through holes 62, which penetrate the pressure plate 6 vertically. A limiting rod 22 passes through the through hole 62, with one end of the limiting rod 22 connected to the bottom inner side of the housing 2 and the other end connected to the top inner side of the housing 2. The water storage box 5 is located between the two limiting rods 22. The limiting rods 22 ensure that the pressure plate 6 can move vertically and remain in contact with the inner wall of the housing 2 during movement or when stationary. This ensures that the movement of the pressure plate 6 can adjust the connection between the heat dissipation hole 21 and the through hole 61.

[0029] The above embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of protection of this application. Any non-substantial changes and substitutions made by those skilled in the art based on this application shall fall within the scope of protection claimed by this application.

Claims

1. A lithium battery device heat source device, comprising a base (1), a housing (2), and a cover plate (3), wherein the housing (2) is mounted on top of the base (1), a lithium battery and a heating unit (4) are placed inside the housing (2), the cover plate (3) is used to cover the housing (2), a temperature sensor (10) is also provided on the base (1), the temperature sensor (10) is electrically connected to a controller, and the controller is used to control the opening and closing of the heating unit (4), characterized in that, The housing (2) is provided with a water storage box (5), the water storage box (5) is provided with a partition (51), water is stored below the partition (51), a sleeve (52) is provided in the middle of the partition (51), a piston (53) and a movable rod (54) are provided inside the sleeve (52), the inner wall of the piston (53) is in contact with the inner wall of the sleeve (52), and the movable rod (54) is located at the top of the piston (53); The top of the water storage box (5) is provided with a pressure plate (6), and the end of the movable rod (54) away from the piston (53) is provided with a pressure sensor (55). The pressure sensor (55) is electrically connected to the controller. After freezing, the water in the water storage box (5) expands toward the sleeve (52) and pushes against the piston (53).

2. The lithium battery device heat source device according to claim 1, characterized in that, The partition (51) is welded inside the water storage box (5). The partition (51) divides the water storage box (5) into complementary upper chamber (56) and lower chamber (57). The water is located in the lower chamber (57). One end of the sleeve (52) is connected to the lower chamber (57), and the other end of the sleeve (52) is connected to the top of the water storage box (5).

3. The lithium battery device heat source device according to claim 2, characterized in that, The partition (51) is an arc shape that gradually bulges from the periphery to the center, and the inner diameter of the sleeve (52) is smaller than the inner diameter of the water storage box (5).

4. The lithium battery device heat source device according to claim 2, characterized in that, The outer wall of the housing (2) is provided with a plurality of waist-shaped heat dissipation holes (21), and the plurality of heat dissipation holes (21) are arranged at equal intervals along the vertical direction. The pressure plate (6) is provided with a plurality of waist-shaped through holes (61), and the plurality of through holes (61) are arranged at the same spacing and direction as the plurality of heat dissipation holes (21). When the bottom of the pressure plate (6) is in contact with the top of the water storage box (5), the side wall of the pressure plate (6) is in contact with the inner wall of the shell (2) and a number of heat dissipation holes (21) and a number of through holes (61) are in a one-to-one correspondence.

5. The lithium battery device heat source device according to claim 4, characterized in that, The width of the heat dissipation hole (21) is less than the minimum distance between two adjacent heat dissipation holes (21).

6. The lithium battery device heat source device according to claim 4, characterized in that, The pressure plate (6) is provided with two through holes (62), which penetrate the pressure plate (6) in the vertical direction. A limiting rod (22) is inserted in the through hole (62). One end of the limiting rod (22) is connected to the bottom inner side of the housing (2), and the other end of the limiting rod (22) is connected to the top inner side of the housing (2). The water storage box (5) is located between the two limiting rods (22).

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