Battery pack and electric device

Abstract

The utility model discloses a battery pack and an electric device, which are used for solving the technical problem that the battery pack is damaged due to the conditions of thermal runaway, dry burning and the like of a battery module caused by the fact that a heating film in the existing battery pack still heats the battery module after the battery module reaches a normal working temperature. The device comprises a box body, a battery assembly, a battery management unit and a battery control unit, the battery assembly comprises a plurality of battery modules and a heating film for heating the battery modules; wherein the battery module is electrically connected with the heating film to supply power to the heating film, a plurality of temperature sensors used for collecting the temperature of the battery module are arranged on the surface of the heating film, the heating film is electrically connected with the battery management unit, the battery management unit is electrically connected with the battery control unit, and a cut-off module is arranged in the battery control unit. When the temperature of the battery module exceeds a preset value, the battery control unit cuts off the power supply of the heating film through the cut-off module.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack and an electric device. Background Art

[0002] In cold weather, the battery capacity of the battery pack will decrease as the temperature drops. To ensure the normal use of the battery pack, a heating component for heating the battery is designed in the existing battery pack. Among them, the heating film is a commonly used heating component for heating the battery, which plays a role in maintaining the stable temperature of the battery in the battery pack. However, sometimes, the heating film still heats the battery module after the battery module reaches the normal working temperature. On the one hand, it causes the heating film itself to dry burn, and on the other hand, it also causes the battery temperature to rise, resulting in situations such as thermal runaway and dry burning of the battery. The above two situations will damage the battery pack and pose a great safety hazard to users.

[0003] Therefore, finding a technical solution to solve the above technical problems has become an important research topic for those skilled in the art. Summary of the Utility Model

[0004] The embodiments of the utility model disclose a battery pack and an electric device, which are used to solve the technical problem that the heating film in the existing battery pack still heats the battery module after the battery module reaches the normal working temperature, resulting in situations such as thermal runaway and dry burning of the battery module, thereby causing damage to the battery pack.

[0005] The embodiments of the utility model provide a battery pack, including a box body, a battery component, a battery management unit and a battery control unit;

[0006] The battery component includes a plurality of battery modules arranged along the first direction of the box body and a heating film for heating the battery modules;

[0007] Wherein, the battery module is electrically connected to the heating film to supply power to the heating film. A plurality of temperature sensors for collecting the temperature of the battery module are arranged on the surface of the heating film. The heating film is electrically connected to the battery management unit, the battery management unit is electrically connected to the battery control unit, and the battery control unit is internally provided with a cut-off module. When the temperature of the battery module exceeds a preset value, the battery control unit cuts off the power supply of the heating film through the cut-off module.

[0008] Optionally, the heating film is arranged between two adjacent battery modules in the battery component, and the heating film is arranged on the outer side surfaces of the battery modules on the opposite sides of the battery component. The plurality of heating films are connected in series.

[0009] Optionally, the heating film includes a first heating film made of polyimide material and a second heating film made of epoxy board material. The heating film located between two adjacent battery modules is the second heating film, and the heating films on the outer sides of the battery modules on the opposite sides of the battery assembly are the first heating films.

[0010] Optionally, the battery module includes two end plates arranged oppositely and a plurality of battery cells installed between the two end plates. The plurality of battery cells are arranged along the second direction of the box body.

[0011] Mounting card holes are provided at both opposite ends of the heating film, and mounting card posts are provided on the end plates and are used in cooperation with the mounting card holes.

[0012] The mounting card holes are engaged with the mounting card posts so that both opposite ends of the heating film are fixedly connected to the two end plates respectively.

[0013] Optionally, the heating film has a positive connection end and a negative connection end. Among them, wires are connected to both the positive connection end and the negative connection end. A male buckle is connected to the wire at the positive connection end of the heating film, and a female buckle is connected to the wire at the negative connection end of the heating film.

[0014] The male buckle of the wire at the positive connection end of one of the two adjacent heating films is engaged with the female buckle of the wire at the negative connection end of the other heating film so that the two adjacent heating films are connected in series.

[0015] Optionally, the battery assembly further includes a bundling strap, which is used to bundle and fix the heating film, the wires and the plurality of battery modules.

[0016] Optionally, a plurality of convex ribs protrude from one side of the inner bottom wall of the box body towards the battery module (2). The plurality of convex ribs are arranged at intervals along the first direction of the box body, and a flow channel for air to flow is formed between two adjacent convex ribs.

[0017] Part of the bottom of the battery module is arranged on the convex ribs, and the other part of the bottom of the battery module is suspended on the flow channel.

[0018] Optionally, two cross beams are arranged along the second direction of the box body. The two cross beams are respectively located at the opposite ends of the battery module. A cavity for injecting coolant is provided inside the cross beam, and the cavity is communicated with a liquid inlet and a liquid outlet.

[0019] Optionally, a plurality of reinforcing ribs are arranged on the outer bottom wall of the box body towards the side away from the battery module. The plurality of reinforcing ribs are arranged at intervals along the first direction of the box body.

[0020] An embodiment of the present utility model provides an electrical device, including the above-mentioned battery pack.

[0021] It can be seen from the above technical solutions that the embodiments of the present utility model have the following advantages:

[0022] In this embodiment, the heating film is powered by the battery module and heats the battery module. The temperature sensor on the heating film is used to obtain the actual temperature of the current battery module. The battery management unit is electrically connected to the heating film, and the battery management unit is electrically connected to the battery control unit. The battery control unit is internally provided with a cut-off module. The battery management unit is used to receive the temperature information of the temperature sensor and compare the temperature information with a preset value. When the temperature of the battery module collected by the temperature sensor exceeds the preset value, the battery control unit cuts off the power supply of the heating film through the cut-off module. Through the above design, the on-off of the heating film can be controlled by detecting the current temperature of the battery module, effectively preventing the battery module from experiencing thermal runaway and dry burning, and ensuring the safety of using the battery pack. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 A schematic structural diagram of a battery pack provided by an embodiment of the present utility model;

[0025] Figure 2 An exploded view of a partial structure of a battery pack provided by an embodiment of the present utility model;

[0026] Figure 3 A schematic structural diagram of a heating film of a battery pack provided by an embodiment of the present utility model;

[0027] Figure 4 A schematic structural diagram when an end plate and a heating film in a battery pack provided by an embodiment of the present utility model are engaged;

[0028] Figure 5 A schematic structural diagram when two adjacent heating films in a battery pack provided by an embodiment of the present utility model are connected in series;

[0029] Figure 6 A schematic structural diagram of a box body in a battery pack provided by an embodiment of the present utility model;

[0030] Figure 7A cross-sectional view of a battery pack provided by an embodiment of the present utility model;

[0031] Figure 8 A schematic bottom structure diagram of a box body of a battery pack provided by an embodiment of the present utility model;

[0032] Illustration: Box body 1; Rib 101; Flow channel 102; Cross beam 103; Reinforcing rib 104; Battery module 2; Battery cell 201; End plate 202; Mounting stud 2021; Heating film 3; First heating film 3a; Second heating film 3b; Positive connection end 301; Negative connection end 302; Mounting card hole 303; Battery management unit 4; Battery control unit 5; Binding strap 6; Male buckle 7; Female buckle 8; Conducting wire 9. First direction X; Second direction Y. Detailed implementation manners

[0033] An embodiment of the present utility model discloses a battery pack and an electrical device, which are used to solve the technical problem that the heating film in the existing battery pack still heats the battery module after the battery module reaches the normal working temperature, resulting in thermal runaway, dry burning, etc. of the battery module, thereby causing damage to the battery pack.

[0034] In order to enable those skilled in the art to better understand the solution of the present utility model, the present utility model will be further described in detail below with reference to the drawings and specific implementation manners. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0035] Please refer to Figures 1 to 8 , an embodiment of the present utility model provides a battery pack, including a box body 1, a battery assembly, a battery management unit 4 and a battery control unit 5;

[0036] The battery assembly includes a plurality of battery modules 2 arranged along the first direction X of the box body 1 and a heating film 3 for heating the battery modules 2;

[0037] Wherein, the battery module 2 is electrically connected to the heating film 3 to supply power to the heating film 3, a plurality of temperature sensors for collecting the temperature of the battery module 2 are arranged on the surface of the heating film 3, the heating film 3 is electrically connected to the battery management unit 4, the battery management unit 4 is electrically connected to the battery control unit 5, and the battery control unit 5 is internally provided with a cut-off module. When the temperature of the battery module 2 exceeds a preset value, the battery control unit 5 cuts off the power supply of the heating film 3 through the cut-off module.

[0038] It should be noted that the box body 1 in this embodiment is a box body 1 similar to a rectangular parallelepiped structure, wherein the first direction mentioned above refers to the width direction of the box body 1 .

[0039] In this embodiment, the heating film 3 is powered by the battery module 2 and heats the battery module 2. The temperature sensor on the heating film 3 is used to obtain the actual temperature of the current battery module 2. The battery management unit 4 is electrically connected to the heating film 3. The battery management unit 4 is electrically connected to the battery control unit 5. The battery control unit 5 has a built-in cut-off module. The battery management unit 4 is used to receive the temperature information of the temperature sensor and compare the temperature information with the preset value. When the temperature of the battery module 2 collected by the temperature sensor exceeds the preset value, the battery control unit 5 cuts off the power supply of the heating film 3 through the cut-off module. Through the above design, the current temperature of the battery module 2 can be detected to control the on and off of the heating film 3, effectively preventing the battery module 2 from thermal runaway and dry burning, and ensuring the safety of the battery pack.

[0040] For further information, see Figure 2 In the battery assembly of this embodiment, the heating film 3 is arranged between two adjacent battery modules 2, the heating films 3 are arranged on the outer side surfaces of the battery modules 2 located on the opposite sides of the battery assembly, and a plurality of the heating films 3 are connected in series.

[0041] It should be noted that, through the above design, each battery module 2 in the battery assembly can be heated by the heating film 3, the plane area of ​​the heating film 3 covers the side area of ​​the battery module, and the above heating film 3 can be fixed to the battery module 2 by pasting.

[0042] For further information, see Figure 2 In this embodiment, the heating film includes a first heating film 3a made of polyimide material and a second heating film 3b made of epoxy board material. The heating film 3 located between two adjacent battery modules 2 is the second heating film 3b, and the heating film 3 located on the outer side of the battery module 2 on the opposite sides of the battery assembly is the first heating film 3a.

[0043] It should be noted that, in this embodiment, the heating film 3 made of epoxy board material and the heating film 3 made of polyimide material are used in combination. The heating film 3 between adjacent battery modules 2 is made of epoxy board material. The heating film 3 made of epoxy board material has high hardness and strong thermal conductivity, which can not only realize the heating function but also increase the overall structural rigidity of the battery assembly. The heating film 3 on the outer side of the two outermost battery modules 2 of the battery assembly is made of polyimide material. Although the hardness of the heating film 3 made of polyimide material is not high, the thickness is small, which is conducive to reducing the volume of the entire battery assembly and saving installation space.

[0044] Further, please refer to Figure 3 and Figure 4 , in this embodiment, the battery module 2 includes two end plates 202 arranged oppositely and a plurality of battery cells 201 installed between the two end plates 202. The plurality of battery cells 201 are arranged along the second direction Y of the box body 1;

[0045] Installation card holes 303 are provided at both opposite ends of the heating film 3, and installation card posts 2021 are provided on the end plates 202 and are used in cooperation with the installation card holes 303;

[0046] The installation card holes 303 are engaged with the installation card posts 2021 so that both opposite ends of the heating film 3 are fixedly connected to the two end plates 202 respectively.

[0047] It should be noted that through the above design, the heating film 3 can be further fixedly connected to the end plate 202, effectively preventing the phenomenon of warping at the end of the heating film 3 and avoiding the situation that the heating film 3 falls off and causes the loss of the heating function of the battery pack.

[0048] In addition, the second direction of the box body 1 specifically refers to the length direction of the box body 1.

[0049] Further, please refer to Figure 5 , the heating film 3 in this embodiment has a positive connection end 301 and a negative connection end 302. Among them, wires 9 are connected to both the positive connection end 301 and the negative connection end 302. A male buckle 7 is connected to the wire 9 of the positive connection end 301 of the heating film 3, and a female buckle 8 is connected to the wire 9 of the negative connection end 302 of the heating film 3;

[0050] The male buckle 7 of the wire 9 at the positive connection end 301 of one of the two adjacent heating films 3 is engaged with the female buckle 8 of the wire 9 at the negative connection end 302 of the other heating film 3 so that the two adjacent heating films 3 are connected in series.

[0051] It should be noted that the above female buckle 8 and male buckle 7 are specifically made of conductive metal materials. Through the above design, the operator can quickly complete the series connection between two adjacent heating films 3 by inserting the male buckle 7 into the female buckle 8, saving installation time and improving the assembly efficiency of the battery pack.

[0052] Further, please refer to Figure 1 , the battery assembly in this embodiment further includes a bundling strap 6, and the bundling strap 6 is used to bundle and fix the heating film 3, the wire 9 and the plurality of battery modules 2.

[0053] It should be noted that through the above design, the integrity of the entire battery assembly can be further improved, and the positions between multiple battery modules 2 can be effectively fixed.

[0054] Specifically, the above-mentioned binding strap 6 is preferably an elastic binding strap. Further, openings can be provided on the binding strap 6, and threaded holes are provided at positions corresponding to the openings on the box body 1. By passing the screw rod of the fixing screw through the opening and threadedly connecting it with the threaded hole, the binding strap 6 can be fixed on the box body 1, effectively preventing the binding strap 6 from shifting.

[0055] Further, please refer to Figure 6 and Figure 7 In this embodiment, a plurality of convex ribs 101 protrude from the inner bottom wall of the box body 1 toward the side of the battery module 2. The plurality of convex ribs 101 are arranged at intervals along the first direction X of the box body 1, and a flow channel 102 for air flow is formed between adjacent two convex ribs 101;

[0056] Part of the bottom of the battery module 2 is disposed on the convex ribs 101, and the other part of the bottom of the battery module 2 is suspended on the flow channel 102.

[0057] It should be noted that the above-mentioned convex ribs 101 can lift the battery module 2 to a certain height. Specifically, the convex ribs 101 lift the height of the battery cells 201 in the battery module 2, so that the top surface of the battery cells 201 is flush with the top surface of the end plate 202. The flow channel 102 formed between adjacent convex ribs 101 can facilitate air circulation and is beneficial to accelerating the heat dissipation of the battery module 2.

[0058] Further, please refer to Figure 7 In this embodiment, two cross beams 103 are provided along the second direction Y of the box body 1. The two cross beams 103 are respectively located at opposite ends of the battery module 2. A cavity for injecting coolant is provided inside the cross beam 103, and the cavity is communicated with a liquid inlet and a liquid outlet.

[0059] It should be noted that the cross beam 103 in this embodiment specifically extends along the first direction of the box body 1. Through the design of the above-mentioned cross beam 103, the stiffness of the box body 1 can be enhanced, and its anti-deformation performance can be improved.

[0060] In addition, the external coolant can be filled into the cavity of the cross beam 103 from the liquid inlet and then flow out from the liquid outlet, and circulate in this way, which is beneficial to further accelerating the heat dissipation of the battery module 2.

[0061] Further, please refer to Figure 8 In this embodiment, a plurality of reinforcing ribs 104 are provided on the outer bottom wall of the box body 1 facing away from the battery module 2. The plurality of reinforcing ribs 104 are arranged at intervals along the first direction X of the box body 1.

[0062] It should be noted that through the above design, the stiffness of the box body 1 can also be enhanced, and its anti-deformation performance can be improved.

[0063] Please refer to Figures 1 to 8 , an electrical device provided by an embodiment of the present invention includes the above battery pack.

[0064] Furthermore, the electrical device in this embodiment is specifically a new energy electric vehicle, and the battery pack is installed in the chassis of the new energy electric vehicle.

[0065] The above has introduced in detail a battery pack and an electrical device provided by the present invention. For those of ordinary skill in the art, according to the idea of the embodiments of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A battery pack, characterized in that: It comprises a box (1), a battery assembly, a battery management unit (4) and a battery control unit (5); The battery assembly comprises a plurality of battery modules (2) arranged along a first direction (X) of the box body (1) and a heating film (3) for heating the battery modules (2); The battery module (2) is electrically connected to the heating film (3) to supply power to the heating film (3); a plurality of temperature sensors for collecting the temperature of the battery module (2) are arranged on the surface of the heating film (3); the heating film (3) is electrically connected to the battery management unit (4); the battery management unit (4) is electrically connected to the battery control unit (5); a cut-off module is built into the battery control unit (5); when the temperature of the battery module (2) exceeds a preset value, the battery control unit (5) cuts off the power supply of the heating film (3) through the cut-off module.

2. The battery pack according to claim 1, characterized in that: The heating film (3) is arranged between two adjacent battery modules (2) in the battery assembly, the heating film (3) is arranged on the outer side surfaces of the battery modules (2) located on two opposite sides of the battery assembly, and a plurality of the heating films (3) are connected in series.

3. The battery pack according to claim 2, characterized in that: The heating film comprises a first heating film (3a) made of a polyimide material and a second heating film (3b) made of an epoxy board material; the heating film (3) located between two adjacent battery modules (2) is the second heating film (3b), and the heating film (3) located on the outer side surfaces of the battery modules (2) on opposite sides of the battery assembly is the first heating film (3a).

4. The battery pack according to claim 2, characterized in that: The battery module (2) comprises two end plates (202) arranged opposite to each other and a plurality of battery cells (201) installed between the two end plates (202), wherein the plurality of battery cells (201) are arranged along a second direction (Y) of the box body (1); The heating film (3) is provided with mounting holes (303) at opposite ends, and the end plate (202) is provided with mounting posts (2021) for use in conjunction with the mounting holes (303); The mounting clamp hole (303) is engaged with the mounting clamp column (2021) so that the opposite ends of the heating film (3) are fixedly connected to the two end plates (202) respectively.

5. The battery pack according to claim 2, characterized in that: The heating film (3) has a positive electrode connection end (301) and a negative electrode connection end (302), wherein the positive electrode connection end (301) and the negative electrode connection end (302) are both connected to a wire (9), the wire (9) of the positive electrode connection end (301) of the heating film (3) is connected to a male buckle (7), and the wire (9) of the negative electrode connection end (302) of the heating film (3) is connected to a female buckle (8); The male buckle (7) of the wire (9) of the positive connection end (301) of one of the two adjacent heating films (3) is engaged with the female buckle (8) of the wire (9) of the negative connection end (302) of the other heating film (3) so that the two adjacent heating films (3) are connected in series.

6. The battery pack according to claim 5, characterized in that: The battery assembly further comprises a binding belt (6), and the binding belt (6) is used to bind and fix the heating film (3), the wire and the plurality of battery modules (2).

7. The battery pack according to claim 1, characterized in that: A plurality of convex ribs (101) are protrudingly provided on a side of the inner bottom wall of the box body (1) facing the battery module (2); the plurality of convex ribs (101) are arranged at intervals along the first direction (X) of the box body (1); and a flow channel (102) for air flow is formed between two adjacent convex ribs (101); Part of the bottom of the battery module (2) is arranged on the convex rib (101), and another part of the bottom of the battery module (2) is suspended on the flow channel (102).

8. The battery pack according to claim 4, characterized in that: The box body (1) is provided with two cross beams (103) along the second direction (Y), and the two cross beams (103) are respectively located at opposite ends of the battery module (2), and the cross beam (103) has a cavity in which a coolant can be injected, and the cavity is connected with a liquid inlet and a liquid outlet.

9. The battery pack according to claim 1, characterized in that: A plurality of reinforcing ribs (104) are provided on the outer bottom wall of the box body (1) facing the side away from the battery module (2), and the plurality of reinforcing ribs (104) are arranged at intervals along the first direction (X) of the box body (1).

10. An electrical device, characterized in that: Comprising a battery pack as claimed in any one of claims 1 to 9.

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