Over-temperature self-protection structure of battery pack

Abstract

The utility model belongs to the technical field of battery pack heating, and particularly relates to an over-temperature self-protection structure of a battery pack. The utility model provides a battery pack over-temperature self-protection structure which comprises a battery pack, a plurality of batteries are arranged in the battery pack, first heating plates are arranged on the two sides in the battery pack, and a second heating plate is connected between the first heating plates on the two sides through a plurality of connecting heat conduction plates. The plurality of batteries are positioned in separated gaps among the plurality of connecting heat-conducting plates; wiring grooves are formed in the first heating plate and the second heating plate in the middle positions of the first heat-conducting plate and the second heat-conducting plate; an adjusting cavity is formed in one side of the battery pack, one end of the first heating plate and one end of the second heating plate are both located in the adjusting cavity, the portions, located in the adjusting cavity, of the first heating plate and the second heating plate are connected with a plurality of cooling fins, and a plurality of fans are arranged on the sides, located on the cooling fins, of the adjusting cavity.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery pack heating, and particularly relates to an over-temperature self-protection structure for a battery pack. Background Art

[0002] When a new energy vehicle is in use, it needs to be powered by a battery pack. Currently, most of the battery packs used are lithium batteries.

[0003] A lithium battery is a battery with lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. It is different from rechargeable lithium-ion batteries and lithium-ion polymer batteries. Due to the very active chemical properties of lithium batteries, the processing, storage, and use of lithium metal have very high environmental requirements. When lithium batteries are used in a low-temperature environment, since the temperature of lithium batteries is relatively low at low temperatures and the activity of internal lithium ions is relatively low, using and charging will cause the phenomenon of lithium deposition on the negative electrode, resulting in a rapid decline in battery capacity. In extreme cases, it may even cause short circuit between the positive and negative electrodes. Therefore, in order to enable lithium batteries to work properly at lower temperatures, a heating device needs to be equipped for lithium batteries to increase the temperature of lithium-ion batteries so that they can work at an appropriate temperature.

[0004] Currently, a lithium battery battery pack can be started and heated during the heating process. However, continuous use will cause the lithium battery battery pack to release more heat, making the lithium battery battery pack prone to over-temperature conditions, and then causing the impact of high temperature on the lithium battery battery pack, and the temperature of the lithium battery battery pack cannot always be within a reasonable range. Therefore, it is necessary to protect the lithium battery from over-temperature conditions. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is that a lithium battery battery pack can be started and heated during the heating process. However, continuous use will cause the lithium battery battery pack to release more heat, making the lithium battery battery pack prone to over-temperature conditions, and the temperature of the lithium battery battery pack cannot always be within a reasonable range.

[0006] To solve the above technical problems, the technical solution provided by the present utility model is as follows: A battery pack over-temperature self-protection structure includes a battery pack. A plurality of batteries are arranged inside the battery pack. First heating plates are arranged on both sides inside the battery pack. A second heating plate is connected between the middle parts of the two first heating plates through a plurality of connecting heat-conducting plates. The plurality of batteries are located in the gaps separated by the plurality of connecting heat-conducting plates. End face heat-conducting plates are arranged at both ends of the first heating plate and the second heating plate inside the battery pack. Wiring grooves are arranged at the middle positions of the first heating plate and the second heating plate at the positions of the first heat-conducting plate and the second heat-conducting plate. An adjustment cavity is arranged on one side of the battery pack. One end of each of the first heating plate and the second heating plate is located inside the adjustment cavity. A plurality of heat dissipation fins are connected to the first heating plate and the second heating plate inside the adjustment cavity. A plurality of air blowers are arranged on one side of the adjustment cavity where the plurality of heat dissipation fins are located, and a ventilation plate is arranged on the other side. A control board is arranged at the end of the adjustment cavity far from the battery pack. The control board is electrically connected to the first heating plate and the second heating plate. A control screen is arranged on the outer wall of the adjustment cavity on one side of the control board.

[0007] Preferably, a first heat insulation layer is arranged between the first heating plate and the end face heat-conducting plate on the inner side of the battery pack.

[0008] Through the above technical solution, the inside of the battery pack can be effectively heat-insulated and heat-preserved, and the influence of external low temperature on the inside of the battery pack can be reduced.

[0009] Preferably, the two first heating plates and the second heating plate have the same length. The height of the first heating plate and the second heating plate is less than the height of the plurality of batteries. The first heating plate and the second heating plate are both located at the middle positions of the plurality of batteries.

[0010] Through the above technical solution, it is prevented that the first heating plate and the second heating plate heat the two end electrodes of the battery, and the positive and negative electrodes of the lithium battery inside the battery pack are prevented from being affected during the heating process.

[0011] Preferably, the first heating plate is sequentially provided with a second heat insulation layer, a first heat-conducting film, a first heat-conducting resistance wire and a first heat-conducting plate from the edge side of the battery pack inward. A third heat insulation layer is arranged between the outer side of the end face heat-conducting plate and the battery pack. The second heating plate is sequentially provided with a second heat-conducting resistance wire, a second heat-conducting film and a second heat-conducting plate from the middle to both sides. The structures inside the first heating plate and the second heating plate are symmetric up and down.

[0012] Through the above technical solution, an operation mode of generating external heat insulation, internal heating and conducting heat to the side of the plurality of batteries is formed, so as to heat and conduct the contacted batteries and the plurality of connecting heat-conducting plates, uniformly heat the batteries, and prevent heat from being wasted by outward transfer.

[0013] Preferably, the entirety of the first heat-conducting resistance wire and the second heat-conducting resistance wire are both arranged in an S-shaped bent and coiled manner, and connection terminal plates are provided at both ends of the first heat-conducting resistance wire and the second heat-conducting resistance wire. A partition plate is provided at the connection terminal plate position in the adjustment cavity, and the connection terminal plate is electrically connected to the control board.

[0014] Through the above technical solution, the S-shaped bent and coiled structure increases the contact area of the first heat-conducting resistance wire and the second heat-conducting resistance wire on the first heating plate and the second heating plate, and is connected and controlled through the connection terminal plate and the control board.

[0015] Preferably, fourth heat insulation layers are provided on both sides of the first heating plate and the second heating plate in the adjustment cavity.

[0016] Through the above technical solution, when the first heating plate and the second heating plate are heated inside the adjustment cavity, the temperature of the side wall of the adjacent adjustment cavity is prevented from being too high.

[0017] Preferably, the control board is a circuit board provided with a micro PTC module. A temperature detector is embedded inside the control board, and the detection end of the temperature detector is connected to multiple batteries through a wiring slot.

[0018] Through the above technical solution, the heating temperature of the first heat-conducting resistance wire and the second heat-conducting resistance wire in the first heating plate and the second heating plate can be adjusted through the micro PTC module, and the real-time temperature of the battery can be monitored, which is convenient for temperature control and prevents over-temperature conditions.

[0019] Preferably, the control screen is an LED display panel with touch function.

[0020] Through the above technical solution, the temperature of this battery pack can be set through the control screen and specific monitoring information can be viewed.

[0021] The advantages of the present utility model compared with the prior art are as follows:

[0022] 1. During the use of this battery pack, the middle part of the battery can be heated through the first heating plates on both sides and the second heating plate in the middle, preventing the positive and negative electrodes of the lithium battery in the battery pack from being affected during the heating process. Multiple connecting heat-conducting plates enable multiple batteries to be heated evenly. Through the multiple heat dissipation fins and multiple fans at one end of the first heating plate and the second heating plate, accelerated heat dissipation can be carried out through the first heating plate and the second heating plate in case of over-temperature, avoiding over-temperature conditions;

[0023] 2. By providing a first heat insulation layer on the inner wall of the battery pack and second, third, and fourth heat insulation layers on the outer sides of the first heating plate and the end face heat conduction plate, this battery pack can effectively insulate and retain heat inside the battery pack and reduce the impact of external low temperatures on the interior of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the structure of an over-temperature self-protection structure for a battery pack of the present utility model Figure 1 ;

[0025] Figure 2 is the structure of an over-temperature self-protection structure for a battery pack of the present utility model Figure 2 ;

[0026] Figure 3 is a longitudinal sectional three-dimensional structure diagram of an over-temperature self-protection structure for a battery pack of the present utility model;

[0027] Figure 4 is an enlarged structure diagram of part A of an over-temperature self-protection structure for a battery pack of the present utility model;

[0028] Figure 5 is an enlarged structure diagram of part B of an over-temperature self-protection structure for a battery pack of the present utility model;

[0029] Figure 6 is a horizontal sectional three-dimensional structure diagram of an over-temperature self-protection structure for a battery pack of the present utility model;

[0030] Figure 7 is an exploded structure diagram of the first heating plate of an over-temperature self-protection structure for a battery pack of the present utility model.

[0031] As shown in the figure: 1. Battery pack; 2. Multiple batteries; 3. First heating plate; 4. Multiple connecting heat conduction plates; 5. Second heating plate; 6. End face heat conduction plate; 7. Wiring groove; 8. Adjustment cavity; 9. Multiple heat dissipation fins; 10. Multiple fans; 11. Ventilation plate; 12. Control board; 13. Control screen; 14. First heat insulation layer; 15. Second heat insulation layer; 16. First heat conduction film; 17. First heat conduction resistance wire; 18. First heat conduction plate; 19. Third heat insulation layer; 20. Second heat conduction resistance wire; 21. Second heat conduction film; 22. Second heat conduction plate; 23. Wiring end plate; 24. Partition plate; 25. Fourth heat insulation layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0033] In the description of the utility model, it should be noted that, unless otherwise clearly defined and limited, terms such as "installation", "provided with", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] As shown in the attached Figure 1-3 description and FIG. 6, an over-temperature self-protection structure for a battery pack 1 includes the battery pack 1. A plurality of batteries 2 are arranged inside the battery pack 1. First heating plates 3 are arranged on both sides inside the battery pack 1. A second heating plate 5 is connected between the middle positions of the two first heating plates 3 on both sides through a plurality of connecting heat-conducting plates 4. A plurality of batteries 2 are located in the gaps separated by the plurality of connecting heat-conducting plates 4. End face heat-conducting plates 6 are arranged at both ends of the first heating plate 3 and the second heating plate 5 inside the battery pack 1. Wiring grooves 7 are arranged at the middle positions of the first heating plate 3 and the second heating plate 5 at the positions of the first heat-conducting plate 18 and the second heat-conducting plate 22. A first heat-insulating layer 14 is arranged inside the battery pack 1 between the first heating plate 3 and the end face heat-conducting plate 6. The two first heating plates 3 and the second heating plate 5 have the same length. The heights of the first heating plate 3 and the second heating plate 5 are less than the height of the plurality of batteries 2. And the first heating plate 3 and the second heating plate 5 are both located at the middle positions of the plurality of batteries 2. Fourth heat-insulating layers 25 are arranged on both sides of the first heating plate 3 and the second heating plate 5 at the adjusting cavity 8.

[0035] In the present utility model, an adjusting cavity 8 is arranged on one side of the battery pack 1. One ends of the first heating plate 3 and the second heating plate 5 are both located inside the adjusting cavity 8. A plurality of heat-dissipating fins 9 are connected between the first heating plate 3 and the second heating plate 5 inside the adjusting cavity 8. A plurality of fans 10 are arranged on one side of the adjusting cavity 8 where the plurality of heat-dissipating fins 9 are located, and a ventilation plate 11 is arranged on the other side. A control board 12 is arranged at the end of the adjusting cavity 8 far from the battery pack 1. The control board 12 is electrically connected to the first heating plate 3 and the second heating plate 5. And a control screen 13 is arranged on the outer wall of the adjusting cavity 8 on one side of the control board 12.

[0036] As shown in the attached Figure 4 、5 As shown in FIGS. 6 and 7, a second heat insulation layer 15, a first heat conduction film 16, a first heat conduction resistance wire 17, and a first heat conduction plate 18 are sequentially arranged on the first heating plate 3 from the edge side of the battery pack 1 inward. A third heat insulation layer 19 is arranged between the outer side of the end face heat conduction plate 6 and the battery pack 1. The second heating plate 5 is sequentially provided with a second heat conduction resistance wire 20, a second heat conduction film 21, and a second heat conduction plate 22 from the middle to both sides. The structures inside the first heating plate 3 and the second heating plate 5 are symmetric up and down. The overall shapes of the first heat conduction resistance wire 17 and the second heat conduction resistance wire 20 are both S-shaped bent and coiled, and terminal plates 23 are arranged at both ends of the first heat conduction resistance wire 17 and the second heat conduction resistance wire 20. The terminal plates 23 are electrically connected to the control board 12.

[0037] In the present utility model, the control board 12 is a circuit board provided with a micro PTC module. A temperature detector is embedded inside the control board 12, and the detection end of the temperature detector is connected to a plurality of batteries 2 through a wiring slot 7. The control screen 13 is an LED display panel with a touch function.

[0038] When the present utility model is specifically implemented, the temperature of the battery is detected by the temperature detector on the control board 12. When the temperature is too low, the first heat conduction resistance wire 17 and the second heat conduction resistance wire 20 are started through the terminal plates 23. Thus, heat is conducted to the first heat conduction plate 18 and the second heat conduction plate 22 through the first heat conduction film 16 and the second heat conduction film 21, and is transferred to a plurality of connecting heat conduction plates 4 and the end face heat conduction plate 6, and finally the plurality of batteries 2 placed in the middle are heated and warmed up. When the temperature is too high, the first heat conduction resistance wire 17 and the second heat conduction resistance wire 20 stop operating, and a plurality of fans 10 start to work. The heat on the first heating plate 3 and the second heating plate 5 is exported for heat dissipation through a plurality of heat dissipation fins 9, and the heat is absorbed and dissipated from the plurality of batteries 2 in the opposite way of heating, so as to achieve the effect of cooling and adjusting the temperature of the plurality of batteries 2, thereby preventing the battery pack 1 from overheating.

[0039] The above describes the present utility model and its implementation manners. This description is not restrictive. What is shown in the specific implementation manners is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. All in all, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments without creative work without departing from the creative purpose of the present utility model, they shall fall within the protection scope of the present utility model.

Claims

1. A battery pack over-temperature self-protection structure, comprising a battery pack, wherein a plurality of batteries are arranged inside the battery pack, characterized in that: The first heating plates are arranged on both sides of the battery pack, and the middle of the first heating plates on both sides is connected to the second heating plates through multiple connecting heat conducting plates, the multiple batteries are located in the gaps separated by the multiple connecting heat conducting plates, and the first heating plates and the second heating plates are arranged with end surface heat conducting plates at both ends of the battery pack, and the first heating plates and the second heating plates are arranged with wiring slots at the middle positions of the first heat conducting plates and the second heat conducting plates; A regulating cavity is provided on one side of the battery pack, one end of the first heating plate and the second heating plate are both located inside the regulating cavity, and the first heating plate and the second heating plate are connected with a plurality of cooling fins inside the regulating cavity, a plurality of fans are provided on one side of the regulating cavity located at the plurality of cooling fins, and a ventilation plate is provided on the other side, a control panel is provided at one end of the regulating cavity away from the battery pack, the control panel is electrically connected to the first heating plate and the second heating plate, and a control screen is provided on one side of the control panel located at the outer wall of the regulating cavity.

2. The battery pack over-temperature self-protection structure according to claim 1, characterized in that: A first heat insulation layer is arranged on the inner side of the battery pack between the first heating plate and the end surface heat conducting plate.

3. The battery pack over-temperature self-protection structure according to claim 1, characterized in that: The first heating plate and the second heating plate have the same length, the height of the first heating plate and the second heating plate is less than the height of the plurality of batteries, and the first heating plate and the second heating plate are both located in the middle of the plurality of batteries.

4. The battery pack over-temperature self-protection structure according to claim 1, characterized in that: The first heating plate is provided with a second thermal insulation layer, a first thermally conductive film, a first thermally conductive resistor wire and a first thermally conductive plate in sequence from one side of the edge of the battery pack to the inside, and a third thermal insulation layer is provided between the outer side of the end face thermally conductive plate and the battery pack, and the second heating plate is provided with a second thermally conductive resistor wire, a second thermally conductive film and a second thermally conductive plate in sequence from the middle to both sides, and the internal structures of the first heating plate and the second heating plate are symmetrical up and down.

5. The battery pack over-temperature self-protection structure according to claim 4, characterized in that: The first thermal resistance wire and the second thermal resistance wire are both S-shaped and coiled, and both ends of the first thermal resistance wire and the second thermal resistance wire are provided with terminal plates, and the regulating cavity is provided with a partition plate at the terminal plate, and the terminal plate is electrically connected to the control board.

6. The battery pack over-temperature self-protection structure according to claim 1, characterized in that: A fourth heat insulation layer is disposed on both sides of the first heating plate and the second heating plate located in the adjustment cavity.

7. The battery pack over-temperature self-protection structure according to claim 1, characterized in that: The control board is a circuit board provided with a micro PTC module. A temperature detector is embedded in the control board, and a detection end of the temperature detector is connected to a plurality of batteries through a wiring slot.

8. The battery pack over-temperature self-protection structure according to claim 1, characterized in that: The control screen is an LED display panel with a touch function.

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