Battery module and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery module which comprises a shell, a liquid cooling assembly and a battery cell fixing disc, the liquid cooling assembly and the battery cell fixing disc are arranged in the shell, and the liquid cooling assembly is supported on the battery cell fixing disc; the liquid cooling assembly comprises two water collecting chambers which are oppositely arranged, one water collecting chamber is connected with a water inlet pipe, the other water collecting chamber is connected with a water outlet pipe, a plurality of heat dissipation pipes are communicated between the two water collecting chambers, and a plurality of mounting positions for mounting battery cells are formed between every two adjacent heat dissipation pipes. The lower ends of the battery cells are connected with the battery cell fixing disc through heat-conducting structural adhesives, the outer walls of the battery cells are connected with the side walls of the heat dissipation pipes through heat-conducting structural adhesives, and the upper ends of the multiple battery cells are electrically connected through a collector plate. According to the utility model, the reworkability of the module and the battery cell can be improved, the heat dissipation effect of the battery module is improved, the risk of high-temperature thermal runaway is avoided, and the risk of short circuit of the battery cell and a battery high-voltage component caused by liquid leakage due to the fact that the bottom scratches and damages a battery liquid cooling assembly in the vehicle running process is reduced.

Description

Technical Field

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

[0002] New energy vehicles are equipped with a battery system, which consists of several battery cells. The existing battery cell types are divided into cylindrical cells, square shell cells, and soft pack cells. At present, the traditional cylindrical cell battery system solution mainly uses structural adhesive to fix the cylindrical cell to the module structure to form a battery module. After the structural adhesive cures, it is placed in the battery box and fixed with bolts or structural glue. The main defects of this structure are: because the battery cells are bonded with structural adhesive, the bonding strength of the structural adhesive is high, which makes it impossible to repair the faulty battery cells individually. When the battery system module fails, after-sales repair can only be achieved by replacing the entire module, which is very costly.

[0003] In addition, the liquid cooling assembly of the existing battery module is set at the end of the battery cell. Not only does it have a small contact area with the battery cell, resulting in poor heat dissipation and the risk of high-temperature heat dissipation runaway, but it also increases the overall thickness of the battery module, thereby reducing the distance between the battery module and the ground. There is a risk that the bottom of the vehicle may be scratched and damaged during driving, leading to the risk of short circuit of the battery cell and battery high-voltage components due to leakage. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a battery module and battery pack, which improve the reworkability of the module and battery cells, improve the heat dissipation effect of the battery module, avoid the risk of high-temperature thermal runaway, and reduce the risk of short circuit of battery cells and battery high-voltage components caused by leakage due to damage to the battery liquid cooling assembly caused by scratches on the bottom of the vehicle during driving.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A battery module comprises a housing, a liquid cooling assembly disposed in the housing, and a battery cell fixing plate, wherein the liquid cooling assembly is supported on the battery cell fixing plate;

[0007] The liquid cooling assembly includes two water collection chambers arranged opposite to each other, one of which is connected to a water inlet pipe, and the other is connected to a water outlet pipe. A plurality of heat dissipation pipes are connected between the two water collection chambers, and a plurality of mounting positions for installing battery cells are formed between two adjacent heat dissipation pipes. The lower end of the battery cell and the battery cell fixing plate, and the outer wall of the battery cell and the side wall of the heat dissipation pipe are connected by heat-conductive structural adhesive, and the upper ends of the plurality of battery cells are electrically connected by a collecting plate.

[0008] Preferably, the battery core is a cylindrical battery core, and the heat dissipation tube is provided with a plurality of arc-shaped clamping surfaces along its length direction, and two opposing clamping surfaces on two adjacent heat dissipation tubes form one installation position.

[0009] Preferably, the clamping surface includes a first clamping surface and a second clamping surface, the first clamping surface and the second clamping surface are respectively recessed in opposite directions, and the first clamping surface and the second clamping surface are spaced apart;

[0010] The two adjacent heat dissipation tubes are respectively a first heat dissipation tube and a second heat dissipation tube. The first clamping surface on the first heat dissipation tube is opposite to the second clamping surface on the second heat dissipation tube, and form an installation position.

[0011] Preferably, the battery cell fixing plate is provided with a plurality of battery cell mounting grooves adapted to the battery cells, and the battery cells are plugged into the battery cell mounting grooves and fixed by heat-conductive structural adhesive.

[0012] Preferably, the shell includes an upper shell and a lower shell connected to each other, the battery cell fixing plate and the liquid cooling assembly are both connected to the lower shell, and a first insulating plate is provided between the current collecting plate and the upper shell.

[0013] Preferably, a liquid cooling tank is provided in the lower shell body, a heating wire tank is provided at the bottom of the liquid cooling tank, the liquid cooling assembly and the battery cell fixing plate are both provided in the liquid cooling tank, a heating wire is provided in the heating wire tank, and a second insulating plate is provided between the heating wire and the battery cell fixing plate.

[0014] Preferably, the bottom wall of the liquid cooling tank is provided with positioning columns at both ends of the heating wire tank, and the second insulating plate and the battery cell fixing plate are provided with positioning holes, the positioning holes correspond to the positioning columns, and the positioning holes are sleeved on the positioning columns.

[0015] Preferably, the bottom wall of the liquid cooling tank is provided with connecting seats at both ends of the heating wire tank, and the outer side of the water collecting chamber is provided with connecting ears corresponding to the connecting seats, and the connecting ears are connected to the connecting seats.

[0016] Preferably, mounting beams are provided on both sides of the liquid cooling tank, the collecting plate is supported on the mounting beams, and a first mounting hole is provided on the mounting beam, and a second mounting hole is provided on the collecting plate corresponding to the first mounting hole, and the first mounting hole is bolted to the second mounting hole.

[0017] A battery pack includes the above-mentioned battery module.

[0018] Compared with the prior art, the battery module and battery pack of the embodiment of the utility model have the following beneficial effects: by using thermally conductive structural adhesive to connect the battery cell to the battery cell fixing plate and the heat dissipation pipe, the bonding strength of the thermally conductive structural adhesive is lower than that of the structural adhesive, thereby improving the reworkability of the battery module and the battery cell. In addition, since the battery cell is placed in the installation position formed by the two heat dissipation pipes, that is, the heat dissipation pipe is in contact with the side of the battery cell, the heat dissipation area of the battery cell is increased, thereby effectively improving the heat dissipation of the battery thermal management system, improving the performance of the battery in high and low temperature environments and reducing the risk of high-temperature thermal runaway. At the same time, since the heat dissipation pipe is located on the side of the battery cell, it does not take up height space, thereby reducing the overall thickness of the battery module and increasing the distance between the battery module and the ground, which can effectively reduce the risk of short circuit of the battery cell and the battery high-voltage components due to leakage caused by the bottom scratching and damaging the battery liquid cooling assembly during driving of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an exploded view of the battery module of the present invention.

[0020] Figure 2 This is a schematic structural diagram of the liquid cooling component of the present invention.

[0021] Figure 3 It is an exploded view of the lower housing assembly of the present invention.

[0022] Figure 4 It is a structural schematic diagram of the lower shell of the utility model.

[0023] Among them: 1-shell, 11-upper shell, 12-lower shell, 121-heating wire slot, 122-positioning column, 123-connecting seat, 2-liquid cooling assembly, 21-water collection chamber, 22-water inlet pipe, 23-water outlet pipe, 24-heating pipe, 25-installation position, 26-quick plug connector, 27-connecting ear, 3-battery cell fixing plate, 31-battery cell installation slot, 32-positioning hole, 4-collecting plate, 5-battery cell, 6-first insulating plate, 7-heating wire, 8-second insulating plate, 9-mounting beam. DETAILED DESCRIPTION

[0024] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0026] like Figure 1-2 As shown, a battery pack according to a preferred embodiment of the present invention includes a battery module, wherein the battery module includes a housing 1, a liquid cooling assembly 2 disposed in the housing 1, and a battery cell fixing plate 3, wherein the liquid cooling assembly 2 is supported on the battery cell fixing plate 3;

[0027] The liquid cooling assembly 2 includes two water collecting chambers 21 arranged opposite to each other, wherein one of the water collecting chambers 21 is connected to a water inlet pipe 22, and the other water collecting chamber 21 is connected to a water outlet pipe 23. Both the water inlet pipe 22 and the water outlet pipe 23 are connected to the water collecting chamber 21 via quick-connect connectors 26. This connection method can avoid the assembly tolerance problem caused by the one-piece molding of the liquid cooling assembly 2. A plurality of heat dissipation pipes 24 are connected between the two water collecting chambers 21, and the heat dissipation pipes 24 are connected to the water collecting chambers 21 by brazing. A plurality of mounting positions 25 for mounting battery cells 5 are formed between two adjacent heat dissipation pipes 24. The lower end of the battery cell 5 and the battery cell fixing plate 3, and the outer wall of the battery cell 5 and the side wall of the heat dissipation pipe 24 are connected by heat-conducting structural adhesive. The upper ends of the plurality of battery cells 5 are electrically connected via the collecting plate 4.

[0028] The battery module and battery pack based on the above technical features use thermally conductive structural adhesive to connect the battery cell 5 to the battery cell fixing plate 3 and the heat dissipation pipe 24. Compared with structural adhesive, the bonding strength of thermally conductive structural adhesive is lower, which improves the repairability of the battery module and battery cell 5. In addition, since the battery cell 5 is placed in the installation position 25 formed by two heat dissipation pipes 24, that is, the heat dissipation pipe 24 is in contact with the side of the battery cell 5, the heat dissipation area of the battery cell 5 is increased, thereby effectively improving the heat dissipation of the battery thermal management system, improving the performance of the battery in high and low temperature environments and reducing the risk of high-temperature thermal runaway. At the same time, since the heat dissipation pipe 24 is located on the side of the battery cell 5, it does not take up height space, thereby reducing the overall thickness of the battery module and increasing the distance between the battery module and the ground, which can effectively reduce the risk of short circuit of the battery cell and the battery high-voltage components caused by leakage due to damage to the battery liquid cooling assembly due to scratches on the bottom during driving of the vehicle.

[0029] In this embodiment, the battery cell 5 is a cylindrical battery cell. The heat pipe 24 is provided with multiple arcuate engaging surfaces along its length. Two opposing engaging surfaces on two adjacent heat pipes 24 form a mounting position 25. Each mounting position 25 accommodates one battery cell 5, and each mounting position 25 is adapted to the battery cell 5 to ensure the stability of the battery cell 5 after installation. Of course, the battery cell 5 may also have other shapes, in which case the shape of the corresponding engaging surfaces will also be modified to adapt to the battery cell 5.

[0030] At the same time, to maximize the installation of the battery cell 5 within the housing 1, the snap-fit surfaces include a first snap-fit surface and a second snap-fit surface. The first snap-fit surface and the second snap-fit surface are recessed in opposite directions, and the first snap-fit surface and the second snap-fit surface are spaced apart. This means that the cross-section of the heat dissipation tube 24 in the horizontal plane is serpentine, and when the heat dissipation tube 24 is unfolded, it forms a first rectangular tube, meaning that the heat dissipation tube 24 has a certain height. Specifically, the current collecting plate 4 is provided with a trough into which the upper end of the battery cell 5 is inserted. The battery cell fixing plate 3 is provided with a plurality of battery cell mounting grooves 31 adapted for the battery cell 5. The lower end of the battery cell 5 is inserted into the battery cell mounting grooves 31 and secured with thermally conductive structural adhesive. The sum of the height of the heat dissipation tube 24, the depth of the trough, and the depth of the battery cell mounting grooves 31 is close to the length of the battery cell 5.

[0031] Furthermore, for ease of description, two adjacent heat pipes 24 are defined as a first heat pipe and a second heat pipe, respectively. The first engaging surface on the first heat pipe faces the second engaging surface on the second heat pipe, forming a first mounting position. In other words, the second engaging surface on the first heat pipe 24 faces the first engaging surface on the second heat pipe, forming a second mounting position. The first mounting position and the second mounting position are closely adjacent, thereby ensuring the maximum number of battery cells 5.

[0032] Please see the attached Figure 1 、 3 4. In this embodiment, the housing 1 includes an upper housing 11 and a lower housing 12 connected to each other. The upper housing 11 and the lower housing 12 are detachably connected. The battery cell fixing plate 3 and the liquid cooling assembly 2 are both connected to the lower housing 12. A first insulating plate 6 is provided between the current collecting plate 4 and the upper housing 1. Specifically:

[0033] The lower housing 12 is provided with a liquid cooling tank, and a heating wire slot 121 is provided at the bottom of the tank. The liquid cooling assembly 2 and the cell retaining plate 3 are both located within the tank. A heating wire 7 is provided within the heating wire slot 121, and a second insulating plate 8 is provided between the heating wire 7 and the cell retaining plate 3. Positioning posts 122 are provided on the bottom wall of the tank, located at both ends of the heating wire slot 121. The second insulating plate 6 and the cell retaining plate 3 are each provided with positioning holes 32, which correspond to and are fitted over the positioning posts 122. The heating wire 7 can be embedded within the heating wire slot 121 via a gluing station. The second insulating plate 8 and the cell retaining plate 3 are glued and stacked one on top of the other. The positioning holes 32 and the positioning posts 122 secure the relative positions of the second insulating plate 8 and the cell retaining plate 3, preventing relative displacement during assembly.

[0034] The positioning holes 32 on the second insulating plate 8 and the cell fixing plate 3 may or may not overlap, preferably overlapping for ease of installation, and may also provide fewer positioning posts 122. If they do not overlap, some positioning posts 122 need to pass through the second insulating plate 8 to connect to the cell fixing plate 3.

[0035] In this embodiment, the bottom wall of the liquid cooling tank is provided with connecting seats 123 at both ends of the heating wire slot 121. Connecting ears 27 are provided on the outside of the water collection chamber 21 corresponding to the connecting seats 123. The connecting ears 27 are connected to the connecting seats 123 via bolts. The number of bolts can be adjusted according to the size and strength requirements of the module, for example, three on each side, for a total of six.

[0036] In this embodiment, mounting beams 9 are provided on both sides of the liquid cooling tank. The current collecting plate 4 is supported on these mounting beams 9. These beams 9 have first mounting holes, and the current collecting plate 4 has second mounting holes corresponding to the first holes. The first and second mounting holes are connected by bolts. The number of bolts can be adjusted based on module size and strength requirements. For example, twelve bolts can be connected to each mounting beam, for a total of twenty-four.

[0037] During assembly, first connect the heating wire 7, the second insulating plate 8 and the battery cell fixing plate 3 to form a lower shell assembly, then assemble the heat dissipation assembly 2, and then use the gluing equipment to apply thermal conductive structural glue to the side of the heat dissipation tube 24 and the battery cell installation groove 31, and then install the battery cell 5. After the battery cell 5 is installed, install the collecting plate 4, and finally connect the upper shell 11 to the lower shell 12.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A battery module, characterized in that: The battery comprises a housing, a liquid cooling assembly and a battery core fixing plate provided in the housing, wherein the liquid cooling assembly is supported on the battery core fixing plate; The liquid cooling assembly includes two water collection chambers arranged opposite to each other, one of which is connected to a water inlet pipe, and the other is connected to a water outlet pipe. A plurality of heat dissipation pipes are connected between the two water collection chambers, and a plurality of mounting positions for installing battery cells are formed between two adjacent heat dissipation pipes. The lower end of the battery cell and the battery cell fixing plate, and the outer wall of the battery cell and the side wall of the heat dissipation pipe are connected by heat-conductive structural adhesive, and the upper ends of the plurality of battery cells are electrically connected by a collecting plate.

2. The battery module according to claim 1, wherein: The battery core is a cylindrical battery core, and a plurality of arc-shaped clamping surfaces are provided on the heat dissipation tube along its length direction. Two opposing clamping surfaces on two adjacent heat dissipation tubes form a mounting position.

3. The battery module according to claim 2, wherein: The clamping surface includes a first clamping surface and a second clamping surface, the first clamping surface and the second clamping surface are respectively recessed in opposite directions, and the first clamping surface and the second clamping surface are spaced apart; The two adjacent heat dissipation tubes are respectively a first heat dissipation tube and a second heat dissipation tube. The first clamping surface on the first heat dissipation tube is opposite to the second clamping surface on the second heat dissipation tube, and form an installation position.

4. The battery module according to claim 1, wherein: The battery cell fixing plate is provided with a plurality of battery cell mounting slots adapted to the battery cells. The battery cells are plugged into the battery cell mounting slots and fixed by heat-conducting structural adhesive.

5. The battery module according to any one of claims 1 to 4, wherein: The housing includes an upper housing and a lower housing connected to each other. The battery cell fixing plate and the liquid cooling assembly are both connected to the lower housing. A first insulating plate is provided between the current collecting plate and the upper housing.

6. The battery module according to claim 5, wherein: A liquid cooling tank is provided in the lower shell, a heating wire tank is provided at the bottom of the liquid cooling tank, the liquid cooling assembly and the battery cell fixing plate are both provided in the liquid cooling tank, a heating wire is provided in the heating wire tank, and a second insulating plate is provided between the heating wire and the battery cell fixing plate.

7. The battery module according to claim 6, wherein: The bottom wall of the liquid cooling tank is located at both ends of the heating wire tank and is provided with positioning columns. The second insulating plate and the battery cell fixing plate are both provided with positioning holes. The positioning holes correspond to the positioning columns and are sleeved on the positioning columns.

8. The battery module according to claim 6, wherein: The bottom wall of the liquid cooling tank is located at both ends of the heating wire tank and is provided with connecting seats. The outer side of the water collecting chamber is provided with connecting ears corresponding to the connecting seats, and the connecting ears are connected to the connecting seats.

9. The battery module according to claim 6, wherein: Mounting beams are provided on both sides of the liquid cooling tank, the collecting plate is supported on the mounting beams, and a first mounting hole is provided on the mounting beam, a second mounting hole is provided on the collecting plate corresponding to the first mounting hole, and the first mounting hole is bolted to the second mounting hole.

10. A battery pack, characterized in that: Comprising the battery module according to any one of claims 1 to 9.

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