Vehicle-mounted low-voltage lithium battery heating unit and lithium battery module

Abstract

The utility model belongs to the field of lithium battery modules, and discloses a vehicle-mounted low-voltage lithium battery heating unit and a lithium battery module. The heating unit comprises a lower shell module, the lower shell module comprises a lower shell, the aluminum heating piece is installed on the lower shell, and the printed circuit board is electrically connected with the aluminum heating piece and the lower shell module. The battery module is electrically connected with the printed circuit board, and a battery cell is arranged in the battery module; the heat-conducting glue layer is arranged between the aluminum heating sheet and the battery cell; according to the utility model, the aluminum heating sheet is fixed on the lower shell and is in contact with the lithium battery through the heat-conducting glue for heating, so that the low-temperature performance of the lithium battery is improved, and the lithium battery has the advantages of simple structure, low cost, convenience in assembly and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of lithium battery module, specifically relates to vehicle low pressure lithium battery heating unit and lithium battery module. BACKGROUND

[0002] Generally, lithium battery will encounter the problems such as discharge capacity drop, internal resistance rise and low charging efficiency under low temperature condition.

[0003] However, as vehicle low pressure lithium battery, it is impossible to run in normal temperature state all the time, and it will inevitably encounter low temperature condition, thereby affecting the performance of lithium battery.

[0004] In order to solve this problem, the conventional method is to heat by liquid heating, heating film, heating wire and other methods to improve the performance of lithium battery under low temperature condition, but as vehicle low pressure lithium battery, the volume is small, the volume of liquid heating method is large, and the cost is also high. The method of heating film or heating wire is relatively expensive, and the assembly process is relatively complex. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies of the prior art, the utility model provides vehicle low pressure lithium battery heating unit and lithium battery module, the utility model fixes the aluminum heating sheet on the shell, and then contacts and heats the lithium battery through the heat-conducting adhesive to improve the low temperature performance of the lithium battery, compared with the prior art, has the advantages such as simple structure, low cost, convenient assembly and the like.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A vehicle low pressure lithium battery heating unit, comprising,

[0008] Lower shell module, comprising a lower shell body,

[0009] Aluminum heating sheet, installed on the lower shell body;

[0010] Printed circuit board, electrically connected with the aluminum heating sheet and lower shell module respectively.

[0011] Battery module, electrically connected with the printed circuit board;The battery module has a battery cell in it.

[0012] Heat-conducting adhesive layer, arranged between the aluminum heating sheet and the battery cell.

[0013] Preferably, the printed circuit board, battery module, aluminum heating sheet and lower shell body are sequentially arranged along the vertical direction.

[0014] Preferably, the lower shell body has a hot melt column, and the aluminum heating sheet is fixed on the lower shell body through the hot melt column.

[0015] Preferably, the printed circuit board has a conductive copper column, the aluminum heating sheet is connected with a terminal, and the conductive copper column is fixed and electrically connected with the terminal.

[0016] Further, the aluminum heating sheet is connected with a wire, one end of the wire is connected with a terminal, and the conductive copper column is fixed and electrically connected with the terminal through a screw.

[0017] Preferably, the lower shell has a thickness direction, the lower shell is provided with a rib position, the rib position extends along the thickness direction, when the upper surface of the lower shell is mounted with a battery module, and the rib position is provided with a heat-conducting glue, the heat-conducting glue is in contact with the battery module, and at this time the upper surface of the rib position abuts against the battery module.

[0018] Preferably, the rib position is further provided with a notch, the aluminum heating sheet has an aluminum heating sheet connecting end, the aluminum heating sheet connecting end extends along the notch and is connected with the wire.

[0019] Preferably, the printed circuit board has,

[0020] A negative electrode column pad, the battery module has a negative electrode welding row, and the negative electrode column pad is electrically connected with the negative electrode welding row.

[0021] A voltage collection pad, the battery module has a voltage collection row pin, and the voltage collection pad is fixed and electrically connected with the voltage collection row pin.

[0022] A positive electrode column pad, the battery module has a positive electrode welding row, and the positive electrode column pad is fixed and electrically connected with the positive electrode welding row.

[0023] A negative electrode column pad, the lower shell module has a negative electrode column, and the negative electrode column pad is fixed and electrically connected with the negative electrode column.

[0024] A positive electrode column pad, the lower shell module has a positive electrode column, and the positive electrode column pad is fixed and electrically connected with the positive electrode column.

[0025] A signal connection pad, the lower shell module has a signal row pin, and the signal connection pad is fixed and electrically connected with the signal row pin.

[0026] Preferably, the printed circuit board has a first group of electronic components for connection control of the negative electrode column pad and the negative electrode column pad.

[0027] The printed circuit board has a second group of electronic components for connection control of the positive electrode column pad and the positive electrode column pad.

[0028] A kind of vehicle-mounted low-voltage lithium battery module, including the heating unit described above, and the lower shell module has battery cell placement cavity, and the number of battery cell is several, several the battery cell is placed in the battery cell placement cavity, several battery cell is sequentially connected in series, several the battery cell extends to the upper surface of lower shell along the thickness direction, the aluminum heating sheet is matched with several battery cell.

[0029] Preferably, the battery module further includes an upper cover module, the upper cover module includes an upper cover, the upper cover is connected with the lower shell to form a battery module shell, and the printed circuit board, the battery module and the aluminum heating sheet are located in the battery module shell, and the upper cover and the lower shell connection place are also sealed by sealing glue.

[0030] Preferably, the lower shell module further includes an exhaust valve, the exhaust valve is connected with the lower shell, and the exhaust valve has an exhaust cavity inside, the lower shell has a cavity inside, and the exhaust cavity is communicated with the cavity.

[0031] And the connection place between the exhaust valve and the lower shell is also sealed by sealing glue.

[0032] Compared with the prior art, the beneficial effects of the present application are:

[0033] 1. Because the vehicle-mounted low-voltage lithium battery heating unit of the present application includes a lower shell module, the lower shell module includes a lower shell, an aluminum heating sheet, the aluminum heating sheet is installed on the lower shell; a printed circuit board, the printed circuit board is electrically connected with the aluminum heating sheet and the lower shell module respectively, and is fixed on the shell by the aluminum heating sheet and contacts the lithium battery by the heat-conducting glue layer to heat, so as to improve the low-temperature performance of the lithium battery, the method has the advantages of simple structure, low cost, convenient assembly and the like.

[0034] 2. Because the lower shell in the present application has a hot melt column, the aluminum heating sheet is fixed on the lower shell through the hot melt column, more specifically, the aluminum heating sheet is fixed on the lower shell after hot melting through the hot melt column, the purpose is that the above-mentioned installation method has low cost and is convenient to assemble.

[0035] 3. Because the heat-conducting glue in the present application is filled between the aluminum heating sheet and the battery cell, it is ensured that the heat can be conducted to the battery cell to heat the battery cell.

[0036] 4. Because the lower shell in the present application has a thickness direction, the lower shell is provided with a rib position, the rib position extends along the thickness direction, when the upper surface of the lower shell is installed with the battery module, and the rib position is provided with heat-conducting glue, the heat-conducting glue contacts the battery module, at this time the upper surface of the rib position pushes against the battery module; that is, the rib position pushes against the battery cell, the module, and is filled and isolated by the heat-conducting glue, so as to prevent the aluminum heating sheet from directly contacting the battery module to cause short circuit. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is an exploded view of the heating unit in the utility model;

[0038] Figure 2 is a structural schematic view of the battery module in the utility model;

[0039] Figure 3 is an exploded view of the battery module in the utility model;

[0040] Figure 4 is a front view of the battery module in the utility model;

[0041] Figure 5 is Figure 4 is a sectional view along A-A direction in the utility model;

[0042] Figure 6 is Figure 5 is a structural schematic view of the B part in the utility model;

[0043] Figure 7 is a structural schematic view of the printed circuit board in the utility model;

[0044] Figure 8 is a structural schematic view of the battery module in the utility model;

[0045] Figure 9 is a top view of the lower shell module and the aluminum heating sheet in the utility model.

[0046] In the drawing: upper cover module 1; upper cover 11; first sealing layer 12; printed circuit board 2; conductive copper column 21; voltage collection pad 22; negative pole column pad 23; positive pole column pad 24; negative pole column pad 25; positive pole column pad 26; signal connection pad 27; battery module 3; battery cell support 31; battery cell 32; positive pole welding row of battery cell 33; battery cell welding row 34; negative pole welding row of battery cell 35; voltage collection row pin 36; heat-conducting glue 4; lower shell module 5; lower shell body 51; hot melting column 511; muscle position 512; notch 5121; positive pole column 513; negative pole column 514; signal row pin 515; aluminum heating sheet 52; wire 521; wiring terminal 522; aluminum heating sheet connecting end 523; exhaust valve 53; second sealing layer 54; fixed support 6. DETAILED DESCRIPTION

[0047] In order to make the technical means, creative features, purposes and effects realized by the utility model easy to understand, the following embodiments are combined with the drawings to specifically describe the utility model, and it should be explained that the description of these embodiments is used to help understanding the utility model, but does not constitute the limitation of the utility model.

[0048] Embodiment 1

[0049] As Figure 1As shown, a vehicle-mounted low-voltage lithium battery heating unit comprises,

[0050] A lower shell module 5 comprises a lower shell 51,

[0051] An aluminum heating sheet 52 is installed on the lower shell 51, specifically, the lower shell 51 has a heat melting column 511, the aluminum heating sheet 52 is fixed on the heat melting column 511, more specifically, the aluminum heating sheet 52 is heat melted on the heat melting column 511, which has the advantages of low cost and convenient assembly;

[0052] A printed circuit board 2 is electrically connected with the aluminum heating sheet 52 and the lower shell module 5, specifically, the printed circuit board 2 has a conductive copper column 21, the aluminum heating sheet 52 is connected with a wiring terminal 522, the conductive copper column 21 is fixed and electrically connected with the wiring terminal 522, and the power-on work is performed through the electrical connection of the conductive copper column 21 on the printed circuit board 2; more specifically, the aluminum heating sheet 52 is connected with a wire 521, one end of the wire 521 is connected with the wiring terminal 522, and the conductive copper column 21 is fixed and electrically connected with the wiring terminal 522 through a screw;

[0053] A battery module 3 is electrically connected with the printed circuit board 2, the printed circuit board 2, the battery module 3, the aluminum heating sheet 52 and the lower shell 51 are arranged in sequence in the vertical direction; the battery module 3 has a cell 32;

[0054] A heat-conducting glue layer is formed by filling the heat-conducting glue 4 between the aluminum heating sheet 52 and the cell 32, which ensures that the heat can be conducted to the cell 32 to heat the cell 32.

[0055] The lower shell 51 has a thickness direction, the lower shell 51 is provided with a rib position 512, the rib position 512 extends along the thickness direction, when the upper surface of the lower shell 51 is installed with the battery module 3, and the rib position 52 is provided with the heat-conducting glue 4, the heat-conducting glue 4 is in contact with the battery module 3, at this time, the upper surface of the rib position 512 abuts against the battery module 3, the purpose is to fill and isolate through the heat-conducting glue 4 to prevent the direct contact between the aluminum heating sheet 52 and the battery module 3 from causing short circuit.

[0056] The rib position 512 is also provided with a notch 5121, the aluminum heating sheet 52 has an aluminum heating sheet connecting end 523, the aluminum heating sheet connecting end 523 extends along the notch 5121 and is connected with the wire 52.

[0057] The printed circuit board 2 has

[0058] A cell negative pole column pad 23, the battery module 3 has a cell negative pole welding row 35, the cell negative pole column pad 23 is electrically connected with the cell negative pole welding row 35;

[0059] Voltage acquisition pad 22, voltage acquisition pin header 36 on battery module 3, voltage acquisition pad 22 and voltage acquisition pin header 36 are fixed and electrically connected;

[0060] The battery module 3 has a positive electrode welding pad 24 for the battery cell and a positive electrode welding row 33 for the battery cell. The positive electrode welding pad 24 for the battery cell is fixed and electrically connected to the positive electrode welding row 33 for the battery cell.

[0061] The negative electrode pad 25 and the lower shell module 5 have a negative electrode post 514. The negative electrode pad 25 and the negative electrode post 514 are fixed and electrically connected.

[0062] Positive electrode pad 26, lower shell module 5 has positive electrode post 513, positive electrode pad 26 is fixed and electrically connected to positive electrode post 513;

[0063] The lower housing module 5 has a signal connection pad 27 and a signal pin header 515. The signal connection pad 27 and the signal pin header 515 are fixed and electrically connected to achieve signal connection with the vehicle.

[0064] The printed circuit board 2 has a first set of electronic components for connecting and controlling the negative electrode pad 23 and the negative electrode pad 25 of the battery cell.

[0065] The printed circuit board 2 has a second set of electronic components for connecting and controlling the positive terminal pad 24 and the positive terminal pad 26 of the battery cell.

[0066] Example 2

[0067] like Figures 2-9 As shown, a low-voltage lithium battery module includes the heating unit in Embodiment 1, and the lower shell module 5 has a cell placement cavity, and the number of cells 32 is several. The cells 32 are placed in the cell placement cavity, and the cells 32 are connected in series and fixed to the battery module 3 by the cell bracket 31 (specifically: the cells 32 are connected in series by the cell welding strip 34, more specifically, each pair of adjacent cells 32 is arranged such that one cell positive electrode is located on the upper surface of the battery module and the other cell positive electrode is located on the lower surface of the battery module; wherein the positive electrode welding strip 33 is welded to the total positive electrode of the battery module 3 for the output of the total positive electrode; the negative electrode welding strip 35 is welded to the total negative electrode of the battery module 3 for the output of the total negative electrode; voltage acquisition pins 36 are welded on the cells 32 to realize voltage acquisition). The cells 32 extend along the thickness direction to the upper surface of the lower shell 51, and the aluminum heating plate 52 is matched with the cells 32.

[0068] The battery module 3 further comprises an upper cover module 1, the upper cover module 1 comprises an upper cover 11, the upper cover 11 is connected with the lower shell 51 to form a battery module shell, and the printed circuit board 2, the battery module 3 and the aluminum heating sheet 52 are all located in the battery module shell, and the connection part of the upper cover 11 and the lower shell 51 is further sealed by a sealing glue to form a first sealing layer 12, and the first sealing layer 12 needs to meet the IP67 level dustproof and waterproof requirement.

[0069] The lower shell module 3 further comprises an exhaust valve 53, the exhaust valve 53 is connected with the lower shell 51, and the exhaust valve 53 has an exhaust cavity in the inside, and the lower shell 51 has a cavity in the inside, and the exhaust cavity is communicated with the cavity;

[0070] And the connection part between the exhaust valve 53 and the lower shell 51 is also sealed by a sealing glue to form a second sealing layer 54, and the existence of the second sealing layer 54 can prevent the heat from gathering in the inside of the shell when the battery cell is in thermal runaway.

[0071] In the embodiment, the battery module is further installed in the vehicle through a fixing support 6, the fixing support 6 extends along the thickness direction, and the upper cover 11 and the lower shell 51 are both fixed on the fixing support 6 along the thickness direction through screws; the lower shell 51 is embedded with a positive pole 513 and a negative pole 514 as the total output positive pole and the total output negative pole of the battery module 5 respectively. The fixing support 6 is designed separately, is fixed with the lower shell module 5 through screws, and different fixing supports 6 can be adopted to adapt to different installation conditions.

[0072] It needs to be explained in the utility model that the aluminum heating sheet 52 is powered by the battery module 3 to the printed circuit board 2, and the printed circuit board 2 is powered to the aluminum heating sheet 52, so that the aluminum heating sheet 52 is heated to heat the battery module 3 to improve the performance of the lithium battery under low temperature.

[0073] The above embodiment is a preferred case of the utility model, and is not used to limit the protection scope of the utility model, and various deformations or modifications made by the ordinary skill in the art within the scope of the appended claims without creative labor still belong to the protection scope of the patent.

Claims

1. A vehicle-mounted low-voltage lithium battery heating unit, comprising: The lower shell module includes a lower shell, characterized in that it further includes: Aluminum heating elements are mounted on the lower housing. The printed circuit board is electrically connected to the aluminum heating element and the lower housing module, respectively; A battery module is electrically connected to the printed circuit board, and the battery module contains battery cells. A thermally conductive adhesive layer is disposed between the aluminum heating element and the battery cell.

2. The vehicle-mounted low-voltage lithium battery heating unit according to claim 1, characterized in that: in, The battery module, printed circuit board, aluminum heating element and lower housing are arranged in sequence along the vertical direction.

3. The vehicle-mounted low-voltage lithium battery heating unit according to claim 1, characterized in that: in, The lower housing has a hot-melt column, and the aluminum heating element is fixed to the lower housing by the hot-melt column.

4. The vehicle-mounted low-voltage lithium battery heating unit according to claim 1, characterized in that: in, The printed circuit board has conductive copper pillars, and the aluminum heating element is connected to a terminal block. The conductive copper pillars are fixed to and electrically connected to the terminal block.

5. The vehicle-mounted low-voltage lithium battery heating unit according to claim 1, characterized in that: in, The lower housing has a thickness direction and is provided with ribs that extend along the thickness direction. When a battery module is installed on the upper surface of the lower housing and thermally conductive adhesive is provided on the ribs, the thermally conductive adhesive is in contact with the battery module, and at this time the upper surface of the ribs presses against the battery module.

6. A vehicle-mounted low-voltage lithium battery module, characterized in that, The device includes the heating unit as described in any one of claims 1-5, and the lower shell module has a cell placement cavity, the number of cells is several, the cells are placed in the cell placement cavity, the cells are connected in series, and the aluminum heating element is matched with the cells.

7. A vehicle-mounted low-voltage lithium battery module according to claim 6, characterized in that: in, Also includes The upper cover module includes an upper cover, which is connected to the lower housing to form a battery module housing. The printed circuit board, the battery module and the aluminum heating element are all located inside the battery module housing. The connection between the upper cover and the lower housing is also sealed with sealant.

8. A vehicle-mounted low-voltage lithium battery module according to claim 6, Its features are: The lower housing module further includes an exhaust valve, which is connected to the lower housing and has an exhaust chamber inside. The lower housing has a cavity, and the exhaust chamber is connected to the cavity. Furthermore, the connection between the exhaust valve and the lower housing is also sealed with sealant.

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