Lithium battery pack with high temperature alarm function

Abstract

The utility model provides a lithium battery pack with a high temperature alarm function, which comprises an upper shell, a lower shell and a plurality of battery monomers fixedly arranged in the lower shell, a circuit guide plate is clamped between the battery monomers and the upper shell, the circuit guide plate is provided with a power connection column connected with the positive electrode and the negative electrode of each battery monomer, and the power connection column is connected with the upper shell. The battery monomers are connected in series through the circuit guide plate, the circuit guide plate and the upper shell are connected through a plurality of memory metal springs, an alarm device is arranged in the upper shell, the memory metal springs are contracted when the battery monomers are heated, so that the circuit guide plate abuts against a trigger switch of the alarm device, and the alarm device is connected with the circuit guide plate. The alarm device generates an alarm signal so as to remind workers to intervene, such as cooling the lithium battery or keeping away from the lithium battery as soon as possible, thereby reducing or avoiding personal and property loss and the like caused by thermal runaway of the lithium battery pack.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field, concretely relates to a lithium battery pack with high temperature alarm function. BACKGROUND

[0002] Lithium battery pack is increasingly widely used in the field of electric vehicles, electric vehicles and electric unmanned aerial vehicles, and its performance and safety are paid more and more attention. In the long use process, the temperature of lithium battery will gradually rise, especially in the charging process, the temperature rise is more obvious, when the temperature rises and thermal runaway occurs, lithium battery may cause explosion or fire, therefore, in order to avoid the occurrence of the above situation, the present urgently needs a lithium battery pack with high temperature alarm function. SUMMARY

[0003] In view of the deficiencies in the prior art, the utility model aims at providing a lithium battery pack with high temperature alarm function to solve the problems mentioned in the background art.

[0004] The utility model discloses a lithium battery pack with high temperature alarm function through the following technical scheme:

[0005] A lithium battery pack with high temperature alarm function, including upper shell and lower shell, a plurality of battery monomers are fixed in the lower shell, the circuit guide plate is arranged between the battery monomer and the upper shell, the circuit guide plate is provided with the electric connection column connected with the positive and negative pole of each battery monomer, each battery monomer is connected in series through the circuit guide plate, the circuit guide plate and the upper shell are connected through a plurality of memory metal springs, the upper shell is equipped with alarm device, the memory metal spring is retracted when the battery monomer generates heat, and the circuit guide plate abuts against the trigger switch of the alarm device.

[0006] Further, the upper end surface of the circuit guide plate is provided with a convex part, and the convex part is used for supporting the trigger switch of the alarm device.

[0007] Further, a plurality of compression springs are arranged between the circuit guide plate and the upper shell.

[0008] Further, the circuit guide plate is provided with an extension part, the extension part is provided with a mounting groove, the opening end of the mounting groove constitutes a necking part, the electric connection column is built in the mounting groove, the outer periphery of the electric connection column is provided with a reset spring abutting against the necking part, and the electric connection column and the circuit guide plate are electrically connected through the first wire soft line.

[0009] Further, the alarm device is a loudspeaker.

[0010] Further, the upper shell is provided with a power interface, and the circuit guide plate and the power interface are electrically connected through the second wire soft line.

[0011] Further, four said memory metal springs are equidistantly arranged at four corners of the upper end surface of the circuit guide plate.

[0012] Further, the contraction deformation temperature of the memory metal spring is 70° to 80°.

[0013] The utility model discloses a lithium battery group with high temperature alarm function, including upper shell and lower shell, a plurality of battery monomer are fixed in the lower shell, the battery monomer with the upper shell between clamping is equipped with the circuit guide plate, the circuit guide plate is equipped with the electricity -making column that connects with the positive pole of every battery monomer, through the circuit guide plate will every battery monomer be connected in series, the circuit guide plate with the upper shell is connected through a plurality of memory metal springs, be equipped with alarm device in the upper shell, the battery monomer generates heat and will make the memory metal spring contract, make the circuit guide plate abut the trigger switch of alarm device, and alarm device generates alarm signal, thereby reminding manual intervention, for example, cooling or as soon as possible away from lithium battery etc. operation to lithium battery, thereby reduce or avoid the personal property loss of lithium battery group and so on heat runaway occurs. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the perspective view of the utility model.

[0015] Figure 2 It is the explosion drawing of the utility model.

[0016] Figure 3 It is the section along Figure 2 It is the section along A-A.

[0017] Figure 4 It is the section of the utility model without upper shell.

[0018] Among them, the above-mentioned drawing includes the following figure marks:

[0019] 1, upper shell, 11, power interface, 12, second wire cord, 2, lower shell, 21, positioning groove, 3, battery monomer, 31, positive and negative pole, 4, circuit guide plate, 41, protruding part, 42, extension, 421, mounting groove, 422, necking part, 43, positioning recess, 5, electricity -making column, 51, reset spring, 52, first wire cord, 53, slot, 6, memory metal spring, 7, compression spring, 8, fixed support. DETAILED DESCRIPTION

[0020] In order to make the purposes, technical schemes and advantages of the embodiments of the utility model clearer, the technical schemes in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model below.It needs to be explained that the description of these embodiments is used for helping understanding the utility model, but does not constitute limitation to the utility model.In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] Referring to Figures 1 to 4 As shown in FIG. 1, a lithium battery pack with high temperature alarm function comprises an upper shell 1 and a lower shell 2, a plurality of battery monomers 3 fixed in the lower shell 2, a circuit guide plate 4 clamped between the battery monomers 3 and the upper shell 1, the circuit guide plate 4 being provided with an electric connection column 5 connected with the positive and negative poles 31 of each battery monomer 3, each battery monomer 3 being connected in series through the circuit guide plate 4, the circuit guide plate 4 and the upper shell 1 being connected through a plurality of memory metal springs 6, the upper shell 1 being provided with an alarm device, the memory metal springs 6 being contracted when the battery monomers 3 heat, and the circuit guide plate 4 abutting against the trigger switch of the alarm device.

[0022] When the battery monomers 3 heat, the temperature of the space formed between the upper shell 1 and the lower shell 2 increases, the memory metal springs 6 are contracted when the temperature increases to the deformation temperature of the memory metal springs 6, thereby driving the circuit guide plate 4 to separate from the battery monomers 3, and the circuit is in an open circuit state, which stops the battery monomers 3 from working or charging. And the memory metal springs 6 continue to contract until the circuit guide plate 4 abuts against the trigger switch of the alarm device, the alarm device generates an alarm signal, and manual intervention is reminded, such as cooling the lithium battery or quickly moving away from the lithium battery, so as to reduce or avoid the personal and property losses caused by thermal runaway of the lithium battery pack.

[0023] The upper end surface of the circuit guide plate 4 is provided with a protruding part 41, the protruding part 41 is used for supporting the trigger switch of the alarm device, and the height of the protruding part 41 is higher than the height of the memory metal springs 6 after contraction, so that the protruding part 41 is in contact with the trigger switch of the alarm device in priority.

[0024] The upper and lower ends of the memory metal springs 6 are fixedly connected with the circuit guide plate 4 and the upper shell 1 respectively, and the fixed connection mode can be various, such as welding, gluing or plug-in connection.

[0025] The circuit guide plate 4 and the upper shell 1 are clamped with several compression springs 7. When the temperature rises to the deformation temperature of the memory metal spring 6, the memory metal spring 6 shrinks and overcomes the elasticity of the compression spring 7, thereby driving the circuit guide plate 4 to separate from the battery monomer 3. When the temperature decreases, the compression spring 7 overcomes the deformation of the memory metal spring 6, and then resets the circuit guide plate 4 to make the power connection column 5 abut against the positive and negative poles 31 of the battery monomer 3. When the memory metal spring 6 is not deformed, the power connection column 5 is kept abutting against the positive and negative poles 31 of the battery monomer 3 through the compression spring 7.

[0026] Preferably, the number of compression springs 7 is four, and they are evenly distributed on the upper end surface of the circuit guide plate 4, so that the circuit guide plate 4 is balanced when it is reset. The circuit guide plate 4 and the upper shell 1 are both provided with positioning grooves 43, and the compression springs 7 are arranged in the positioning grooves 43.

[0027] The lower end surface of the circuit guide plate 4 is provided with an extension 42, and the extension 42 is provided with a mounting groove 421, and the opening end of the mounting groove 421 constitutes a necking portion 422. The power connection column 5 is arranged in the mounting groove 421, and a reset spring 51 is arranged on the outer periphery of the power connection column 5 to abut against the necking portion 422. The power connection column 5 and the circuit guide plate 4 are electrically connected through a first wire soft line 52. One end of the power connection column 5 is kept protruding from the mounting groove 421 through the reset spring 51, and abuts against the positive and negative poles 31 of the battery monomer 3. The power connection column 5 is conveniently displaced up and down through the redundant length of the first wire soft line 52.

[0028] The power connection column 5 is provided with a notch 53 that is buckled on the positive and negative poles 31 of the battery monomer 3, thereby playing a guiding role when the circuit guide plate 4 is lifted and lowered.

[0029] The alarm signal of the alarm device has various forms. When the alarm device is a loudspeaker, the alarm signal is the sound emitted by the loudspeaker. When the alarm device is a pressure sensor or a contact switch sensor, the alarm signal can be transmitted to the operation screen in the form of an electric signal generated by the sensor, and displayed on the operation screen.

[0030] The upper shell 1 is provided with a power interface 11, and the circuit guide plate 4 is electrically connected to the power interface 11 through a second wire soft line 12. The circuit guide plate 4 is conveniently displaced up and down through the redundant length of the second wire soft line 12.

[0031] The circuit guide plate 4 is arranged with a conductive wire, which is connected to the power connection column 5, and then the power connection column 5 is connected to the positive and negative poles 31 of the battery monomer 3, thereby realizing the series connection of the circuit of the battery monomer 3.

[0032] The four memory metal springs 6 are equally spaced at the four corners of the upper surface of the circuit guide plate 4, so that when the memory metal springs 6 contract, the pulling force generated on the circuit guide plate 4 remains balanced, thereby ensuring that each terminal 5 is disconnected from the positive and negative terminals 31 of each battery cell 3.

[0033] The shrinkage temperature of the memory metal spring 6 is 70°C to 80°C. Since the main heat generation point is the connection between the positive and negative electrodes 31 of the battery cell 3 and the terminal 5, and heat conduction to the memory metal spring 6 requires a certain path and time, the temperature at the connection between the positive and negative electrodes 31 of the battery cell 3 and the terminal 5 will be higher than the temperature conducted to the memory metal spring 6. By limiting the shrinkage temperature of the memory metal spring 6 to 70°C to 80°C, excessively high temperatures at the connection between the positive and negative electrodes 31 of the battery cell 3 and the terminal 5 are avoided, reducing or even eliminating the risk of spontaneous combustion or explosion of the battery pack.

[0034] The upper shell 1 and the lower shell 2 are sealed together, thus protecting the battery cell 3. The sealed connection structure is existing technology and will not be described in detail here.

[0035] It also includes a fixing bracket 8, which is made of rubber and is fitted around the outer periphery of the battery cell 3. The lower shell 2 is provided with a positioning groove 21, in which the lower end of the battery cell 3 is embedded. The upper end of the positioning groove 21 is connected to the lower shell 2 through the fixing bracket 8.

[0036] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0037] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0038] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lithium battery pack with a high-temperature alarm function, characterized in that: The application relates to a battery pack, which comprises an upper shell (1) and a lower shell (2), a plurality of battery monomers (3) fixed in the lower shell (2), a circuit guide plate (4) arranged between the battery monomers (3) and the upper shell (1), an electric connection column (5) arranged on the circuit guide plate (4) and connected with the positive and negative poles (31) of each battery monomer (3), each battery monomer (3) is connected in series through the circuit guide plate (4), the circuit guide plate (4) and the upper shell (1) are connected through a plurality of memory metal springs (6), an alarm device is arranged in the upper shell (1), and the memory metal springs (6) are contracted when the battery monomers (3) generate heat, so that the circuit guide plate (4) abuts against a trigger switch of the alarm device.

2. The lithium battery pack with high temperature alarm function according to claim 1, characterized in that: The upper end surface of the circuit guide plate (4) is provided with a protruding part (41) for supporting the trigger switch of the alarm device.

3. The lithium battery pack with high temperature alarm function according to claim 1, characterized in that: A plurality of compression springs (7) are arranged between the circuit guide plate (4) and the upper shell (1).

4. The lithium battery pack with high temperature alarm function according to claim 1, characterized in that: The circuit guide plate (4) is provided with an extension part (42), the extension part (42) is provided with a mounting groove (421), the opening end of the mounting groove (421) forms a necking part (422), the electric connection column (5) is arranged in the mounting groove (421), a reset spring (51) is arranged on the outer periphery of the electric connection column (5) and abuts against the necking part (422), and the electric connection column (5) and the circuit guide plate (4) are electrically connected through a first wire soft line (52).

5. The lithium battery pack with high temperature alarm function according to claim 1, characterized in that: The alarm device is a loudspeaker.

6. The lithium battery pack with high temperature alarm function according to claim 1, characterized in that: The upper shell (1) is provided with a power supply interface (11), and the circuit guide plate (4) and the power supply interface (11) are electrically connected through a second wire soft line (12).

7. The lithium battery pack with high temperature alarm function according to claim 1, characterized in that: Four memory metal springs (6) are arranged at four corner positions of the upper end surface of the circuit guide plate (4) at equal intervals.

8. The lithium battery pack with high temperature alarm function according to any one of claims 1 to 6, characterized in that: The contraction deformation temperature of the memory metal spring (6) is 70-80 DEG.

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