A liquid cooling plate, a battery pack and a potting method

Abstract

The present invention relates to a liquid cooling plate, a battery pack and a potting method. The liquid cooling plate has a glue flow channel, at least one glue outlet penetrating through the side wall of the liquid cooling plate is provided on at least one side of the glue flow channel, one end of the glue flow channel has a glue inlet, and the other end is closed. The liquid cooling plate has a glue flow channel for injecting glue from one end thereof, and a glue conduit can be inserted into the glue flow channel for potting. The glue overflows from the glue outlet and flows into the space between the liquid cooling plate and the battery cell group. There is enough space in the liquid cooling plate for the glue conduit to pass through, without inserting a rubber tube between the liquid cooling plate and the battery cell group or replacing the glue with low viscosity and poor heat conduction. When the gap between the liquid cooling plate and the battery cell group is small, potting can be carried out smoothly. At the same time, the liquid cooling plate also plays a role in heat exchange for the battery cell group.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and particularly relates to a liquid cooling plate, a battery pack, and a potting method. Background Art

[0002] After the battery cell group is assembled, it is necessary to pot a thermal conductive structural adhesive between the battery cell group and the liquid cooling plate to fill the gap to meet the heat conduction requirements. However, when the gap between the battery cell group and the liquid cooling plate is too small, it will cause difficult potting.

[0003] Currently, when potting, the method of potting from top to bottom is mostly used. For a deeper gap, it is necessary to insert a glue pipe to assist in potting. However, when the structure of the battery pack is compact and the gap between the battery cell group and the liquid cooling plate is too small, the glue pipe cannot be inserted into the gap, so potting cannot be achieved, and the potting process requirements cannot be met. At the same time, potting from top to bottom will cause air entrapment in the gap and cannot fill the entire gap.

[0004] Especially for a long battery cell group that requires a long potting distance, the traditional top-down potting method requires complex potting equipment for assistance, has a high cost, and also has the problems of being inapplicable to small gaps and prone to generating bubbles. Summary of the Invention

[0005] The present invention provides a liquid cooling plate, a battery pack, and a potting method to solve one or several of the above technical problems.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: A liquid cooling plate, the liquid cooling plate has a glue flow channel, at least one side of the glue flow channel has at least one glue outlet penetrating through the side wall of the liquid cooling plate, one end of the glue flow channel has a glue inlet, and the other end is closed.

[0007] The liquid cooling plate of the present invention has a glue flow channel for injecting glue from one end, and a glue conduit can be inserted into the glue flow channel for potting. The glue overflows from the glue outlet and flows into the space between the liquid cooling plate and the battery cell group. There is enough space in the liquid cooling plate for the glue conduit to pass through, without inserting a glue pipe between the liquid cooling plate and the battery cell group or replacing the glue with low viscosity and poor heat conduction. When the gap between the liquid cooling plate and the battery cell group is small, potting can be carried out smoothly. At the same time, the liquid cooling plate also plays a role in heat exchange for the battery cell group.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Further, there is at least one glue flow channel, which is located at the lower part of the liquid cooling plate.

[0010] During potting, the glue overflows from the glue outlet located at the lower part of the liquid cooling plate into the gap between the liquid cooling plate and the battery cell group. As the glue is continuously poured in, the glue overflows upward from the lower part of the gap and gradually fills the gap. Compared with directly applying glue on the liquid cooling plate and then assembling it with the battery cell group or pouring glue downward from the upper part of the gap, setting the glue flow channel at the lower part of the liquid cooling plate can achieve pouring glue from the bottom upward, which is beneficial for exhausting air during the potting process.

[0011] Furthermore, there are at least two glue flow channels, and the at least two glue flow channels are arranged at intervals from bottom to top, and one of the glue flow channels is located at the lower part of the liquid cooling plate.

[0012] For glue with a relatively high viscosity or for a liquid cooling plate and a battery cell group with a relatively high vertical height, it is difficult for the glue to directly overflow from the bottom to the top of the liquid cooling plate. At least two glue flow channels can be set. First, fill the lower part of the gap between the liquid cooling plate and the battery cell group with glue through the lower glue flow channel, and then pour glue through an upper glue flow channel, and operate in sequence until the gap is completely filled with glue.

[0013] Furthermore, at least one side of the glue flow channel has a plurality of glue outlets arranged at intervals.

[0014] Pour glue into the plurality of glue outlets in sequence to ensure that the gap can be filled with glue along the length direction of the liquid cooling plate. Especially for a liquid cooling plate and battery cell group with a relatively long length, only one glue conduit needs to pass through the plurality of glue outlets in sequence to achieve potting at multiple positions, without the need to use a complex glue application device.

[0015] Furthermore, the glue flow channel is horizontally arranged. The structure is simple, the processing is convenient, and the glue conduit moves smoothly in the glue flow channel.

[0016] The present invention also provides a battery pack, which includes a battery cell group, a housing, and the liquid cooling plate, and the battery cell group and the liquid cooling plate are tightly attached and installed in the housing.

[0017] The battery pack of the present invention uses a liquid cooling plate with a glue flow channel. The battery pack has a compact structure, and potting can be smoothly carried out even when the gap between the liquid cooling plate and the battery cell group is relatively small. At the same time, the liquid cooling plate also plays a role in heat exchange for the battery cell group.

[0018] Furthermore, there are multiple battery cell groups and multiple liquid cooling plates, and the multiple battery cell groups and the multiple liquid cooling plates are alternately and tightly attached. The heat exchange efficiency is high.

[0019] Furthermore, there are multiple battery cell groups and multiple liquid cooling plates. Two battery cell groups are tightly attached to both sides of one liquid cooling plate to form a battery cell - liquid cooling assembly, and multiple battery cell - liquid cooling assemblies are arranged side by side in the housing.

[0020] Two battery cell groups share a liquid cooling plate, which can achieve effective heat exchange while saving the number of liquid cooling plates, with a compact structure and low cost.

[0021] Furthermore, a filler is filled between the housing and the battery cell group. If the gap between the battery cell group and the housing is large, the filler can be filled to prevent a large amount of glue from flowing from the end of the battery cell group to the gap between the battery cell group and the housing. If the gap between the battery cell group and the housing is small and the amount of glue flowing into the gap between the battery cell group and the housing is small, thus having little impact on the glue filling in the gap between the battery cell group and the liquid cooling plate, then filling or not filling the filler can be selected.

[0022] The present invention also provides a glue filling method for the battery pack, including the following steps:

[0023] Step 1: Arrange the battery cell group and the liquid cooling plate closely.

[0024] Step 2: Insert one end of the glue conduit into the glue flow channel from the glue inlet, and then place the battery cell group and the liquid cooling plate into the housing; or, place the battery cell group and the liquid cooling plate into the housing, and then insert the glue conduit into the glue flow channel from the glue inlet.

[0025] Step 3: Fill the glue flow channel with glue through the glue conduit, and the glue overflows from the glue outlet and fills the gap between the battery cell group and the liquid cooling plate.

[0026] Glue filling between the battery cell group and the liquid cooling plate is convenient and applicable to the case of a small gap between the two. Description of the Drawings

[0027] Figure 1 is a three-dimensional structure schematic diagram of a liquid cooling plate of the present invention;

[0028] Figure 2 is a side view of a liquid cooling plate of the present invention;

[0029] Figure 3 is a rear cross-sectional view of a liquid cooling plate of the present invention;

[0030] Figure 4 is a three-dimensional view of a battery pack of the present invention;

[0031] Figure 5 is a top view of a battery pack of the present invention;

[0032] Figure 6 is a flowchart of a glue filling method of the present invention.

[0033] In the drawings, the list of components represented by each reference numeral is as follows:

[0034] 1. Liquid cooling plate, 11. Liquid inlet, 12. Liquid outlet, 2. Glue flow channel, 21. Glue inlet, 22. Glue outlet, 3. Housing, 4. Glue conduit. Detailed implementation manners

[0035] The principles and features of the present invention will be described below. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0036] Embodiment 1

[0037] As Figures 1-3 shown, the present invention provides a liquid cooling plate. The liquid cooling plate 1 has a glue flow channel 2. At least one side of the glue flow channel 2 has at least one glue outlet 22 penetrating through the side wall of the liquid cooling plate 1. One end of the glue flow channel 2 has a glue inlet 21, and the other end is closed.

[0038] Among them, as Figure 1 shown, the longitudinal section of the glue flow channel 2 can be rectangular, circular or other geometric shapes. Preferably, the glue flow channel 2 with a circular longitudinal section is adopted. The outer diameter of the glue conduit 4 inserted into the glue flow channel 2 is the same as the diameter of the glue flow channel 2. In this way, the glue flow channel 2 is convenient to process, and the gap between the glue flow channel 2 and the glue conduit 4 is small, which can reduce the backflow of the glue along the glue flow channel 2 during the glue filling process.

[0039] As Figure 2 shown, the glue flow channel 2 can be a straight channel, which can be horizontally arranged or inclined, for example, arranged along the diagonal direction of the liquid cooling plate 1, or can be zigzag; or the glue flow channel 2 can be an arc-shaped channel, for example, can be an S-shaped channel.

[0040] The inside of the liquid cooling plate 1 has a refrigerant flow channel. The refrigerant flow channel has a liquid inlet 11 and a liquid outlet 12. The liquid inlet 11 and the liquid outlet 12 are communicated with a refrigerant circulation device through pipelines. The refrigerant enters the refrigerant flow channel from the refrigerant circulation device through the liquid inlet 11, and then flows out from the liquid outlet 12 and returns to the refrigerant circulation device. As Figure 1 and Figure 2 shown, in one implementation manner, the liquid inlet 11 and the liquid outlet 12 are arranged at the same end of the liquid cooling plate 1. In other implementation manners, the liquid inlet 11 and the liquid outlet 12 can also be respectively arranged at different ends of the liquid cooling plate 1, or one of them is arranged at the top of the liquid cooling plate 1 and the other is arranged at the end of the liquid cooling plate 1.

[0041] The liquid cooling plate 1 has a glue flow channel 2 for injecting glue from one end. A glue conduit 4 can be inserted into the glue flow channel 2 to inject glue. The glue overflows from the glue outlet 22 and flows into the space between the liquid cooling plate 1 and the battery cell group. There is enough space in the liquid cooling plate 1 for the glue conduit 4 to pass through, without inserting a rubber tube between the liquid cooling plate 1 and the battery cell group or replacing the glue with low viscosity and poor heat conduction. When the gap between the liquid cooling plate 1 and the battery cell group is small, the glue can be injected smoothly. At the same time, the liquid cooling plate 1 also plays a role in heat exchange for the battery cell group.

[0042] Example 2

[0043] As Figures 1-3 shown, the present invention provides a liquid cooling plate. The liquid cooling plate 1 has a glue flow channel 2. At least one side of the glue flow channel 2 has at least one glue outlet 22 penetrating through the side wall of the liquid cooling plate 1. One end of the glue flow channel 2 has a glue inlet 21 and the other end is closed.

[0044] Among them, as Figure 2 shown, the longitudinal cross-section of the glue flow channel 2 can be rectangular, circular or other geometric shapes. Preferably, the glue flow channel 2 with a circular longitudinal cross-section is adopted. The outer diameter of the glue conduit 4 inserted into the glue flow channel 2 is the same as the diameter of the glue flow channel 2. In this way, the glue flow channel 2 is convenient to process, and the gap between the glue flow channel 2 and the glue conduit 4 is small, which can reduce the backflow of the glue along the glue flow channel 2 during the glue filling process.

[0045] As Figure 3 shown, the glue flow channel 2 can be a straight channel, which can be horizontally arranged or inclined, for example, arranged along the diagonal direction of the liquid cooling plate 1, or can be zigzag; or the glue flow channel 2 can be an arc-shaped channel, for example, can be an S-shaped channel.

[0046] The inside of the liquid cooling plate 1 has a refrigerant flow channel. The refrigerant flow channel has a liquid inlet 11 and a liquid outlet 12. The liquid inlet 11 and the liquid outlet 12 are connected to a refrigerant circulation device through pipes. The refrigerant enters the refrigerant flow channel from the refrigerant circulation device through the liquid inlet 11, and then flows out from the liquid outlet 12 and returns to the refrigerant circulation device. As Figure 2 and Figure 3 shown, in one implementation, the liquid inlet 11 and the liquid outlet 12 are arranged at the same end of the liquid cooling plate 1. In other implementations, the liquid inlet 11 and the liquid outlet 12 can also be respectively arranged at different ends of the liquid cooling plate 1, or one of them is arranged at the top of the liquid cooling plate 1 and the other is arranged at the end of the liquid cooling plate 1.

[0047] The liquid cooling plate 1 has a glue flow channel 2 for injecting glue from one end. A glue conduit 4 can be inserted into the glue flow channel 2 to inject glue. The glue overflows from the glue outlet 22 and flows into the space between the liquid cooling plate 1 and the battery cell group. There is enough space in the liquid cooling plate 1 for the glue conduit 4 to pass through. There is no need to insert a rubber tube between the liquid cooling plate 1 and the battery cell group or replace the glue with low viscosity and poor heat conduction. When the gap between the liquid cooling plate 1 and the battery cell group is small, the glue can be injected smoothly. At the same time, the liquid cooling plate 1 also plays a role in heat exchange for the battery cell group.

[0048] There is at least one glue flow channel 2, which is located at the lower part of the liquid cooling plate 1.

[0049] Specifically, the glue flow channel 2 can be one and located at the lower part of the liquid cooling plate 1, and at least one side of the glue flow channel 2 has the glue outlet 22. Alternatively, the glue flow channel 2 can also be two, and the two glue flow channels 2 are arranged side by side in the thickness direction of the liquid cooling plate 1. One side of each glue flow channel 2 has the glue outlet 22, and the glue outlet 22 penetrates through the side wall of the liquid cooling plate 1 where the glue flow channel 2 is located. In other words, in Figure 2 the shown direction, the two glue flow channels 2 are arranged side by side at the front side and the rear side of the lower part of the liquid cooling plate 1. The glue outlet 22 of the glue flow channel 2 at the rear side penetrates through the rear side wall of the liquid cooling plate 1, and the glue outlet 22 of the glue flow channel 2 at the front side penetrates through the front side wall of the liquid cooling plate 1. In addition, when there are multiple glue flow channels 2, it can be: there is one glue flow channel 2 at the lower part of one side of the liquid cooling plate 1, and multiple glue flow channels 2 are arranged from bottom to top at the lower part of the other side; it can also be that multiple glue flow channels 2 are arranged from bottom to top on both sides of the liquid cooling plate 1.

[0050] During glue filling, the glue overflows from the glue outlet located at the lower part of the liquid cooling plate into the gap between the liquid cooling plate and the battery cell group. As the glue is continuously filled, the glue overflows upward from the lower part of the gap and gradually fills the gap. Compared with directly applying glue on the liquid cooling plate and then assembling it with the battery cell group or filling glue from the upper part of the gap downward, arranging the glue flow channel at the lower part of the liquid cooling plate can achieve filling glue from the bottom up, which is beneficial for exhausting air during the glue filling process.

[0051] Embodiment 3

[0052] As Figures 1-3 shown, the present invention provides a liquid cooling plate. The liquid cooling plate 1 has a glue flow channel 2. At least one side of the glue flow channel 2 has at least one glue outlet 22 that penetrates through the side wall of the liquid cooling plate 1. One end of the glue flow channel 2 has a glue inlet 21, and the other end is closed.

[0053] Among them, as Figure 2 shown, the longitudinal section of the glue flow channel 2 can be rectangular, circular or other geometric shapes. Preferably, a glue flow channel 2 with a circular longitudinal section is adopted. The outer diameter of the glue conduit 4 inserted into the glue flow channel 2 is the same as the diameter of the glue flow channel 2. In this way, the glue flow channel 2 is convenient to process, and the gap between the glue flow channel 2 and the glue conduit 4 is small, which can reduce the backflow of the glue along the glue flow channel 2 during the glue filling process.

[0054] As Figure 3 shown, the glue flow channel 2 can be a straight channel, which can be horizontally arranged, inclined, for example, arranged along the diagonal direction of the liquid cooling plate 1, or can be zigzag; or the glue flow channel 2 can be an arc-shaped channel, for example, can be an S-shaped channel.

[0055] The interior of the liquid cooling plate 1 has a refrigerant flow channel, which has a liquid inlet 11 and a liquid outlet 12. The liquid inlet 11 and the liquid outlet 12 are connected to a refrigerant circulation device through pipelines. The refrigerant enters the refrigerant flow channel from the refrigerant circulation device through the liquid inlet 11, and then flows out from the liquid outlet 12 and returns to the refrigerant circulation device. As Figure 2 and Figure 3 shown, in one embodiment, the liquid inlet 11 and the liquid outlet 12 are arranged at the same end of the liquid cooling plate 1. In other embodiments, the liquid inlet 11 and the liquid outlet 12 can also be respectively arranged at different ends of the liquid cooling plate 1, or one of them is arranged at the top of the liquid cooling plate 1 and the other is arranged at the end of the liquid cooling plate 1.

[0056] The liquid cooling plate 1 has a glue flow channel 2 for injecting glue from one end thereof. A glue conduit 4 can be inserted into the glue flow channel 2 to inject glue. The glue overflows from the glue outlet 22 and flows into the space between the liquid cooling plate 1 and the battery cell group. There is enough space in the liquid cooling plate 1 for the glue conduit 4 to pass through, without the need to insert a rubber tube between the liquid cooling plate 1 and the battery cell group or replace the glue with low viscosity and poor thermal conductivity. When the gap between the liquid cooling plate 1 and the battery cell group is small, glue injection can be carried out smoothly. At the same time, the liquid cooling plate 1 also plays a role in heat exchange for the battery cell group.

[0057] There are at least two of the glue flow channels 2, and at least two of the glue flow channels 2 are arranged at intervals from bottom to top, and one of the glue flow channels 2 is located at the lower part of the liquid cooling plate 1.

[0058] For glue with relatively high viscosity or a liquid cooling plate and battery cell group with a relatively high vertical height, it is difficult for the glue to directly overflow from the bottom to the top of the liquid cooling plate. At least two glue flow channels can be set. First, fill the lower part of the gap between the liquid cooling plate and the battery cell group with glue through the lower glue flow channel, and then inject glue through an upper glue flow channel, and operate in sequence until the gap is completely filled with glue.

[0059] Among them, according to the conventional size of the liquid cooling plate 1 and the viscosity of the glue, the glue flow channel 2 is preferably 2 - 5, and of course, other numbers of glue flow channels 2 can also be used.

[0060] Example 4

[0061] On the basis of any one of Examples 1 to 3, at least one side of the glue flow channel 2 has a plurality of the glue outlets 22 arranged at intervals.

[0062] Specifically, one side of the glue flow channel 2 has a plurality of the glue outlets 22 arranged at intervals; or both sides of the glue flow channel 2 have a plurality of the glue outlets 22 arranged at intervals, and the glue outlets 22 on both sides can be arranged in pairs or staggeredly. That is to say, as Figure 3As shown, the first glue outlet 22 at the left end of the front side and the rear side of the glue flow channel 2 is called a set of glue outlets 22. The two glue outlets 22 in a set can be aligned left and right, or can be offset left and right.

[0063] Glue is poured into the multiple glue outlets 22 in sequence to ensure that the gap between the liquid cooling plate 1 and the battery cell group can be filled with glue along the length direction of the liquid cooling plate. Especially for a liquid cooling plate and a battery cell group with a longer length, only one glue conduit needs to pass through the multiple glue outlets 22 in sequence to achieve glue pouring at multiple positions, without the need to use a complex glue application device.

[0064] Embodiment 5

[0065] On the basis of any one of Embodiments 1 to 4, as Figure 3 shown, the glue flow channel 2 is horizontally arranged. The structure is simple, the processing is convenient, and the glue conduit moves smoothly in the glue flow channel.

[0066] The glue flow channel 2 is at least one. When the glue flow channel 2 is at least two, each of the glue flow channels 2 is horizontally arranged.

[0067] Embodiment 6

[0068] This embodiment provides a battery pack, including a battery cell group, a housing 3, and the liquid cooling plate according to any one of Embodiments 1 to 5. The battery cell group and the liquid cooling plate 1 are tightly attached and installed in the housing 3.

[0069] The battery pack of this embodiment uses a liquid cooling plate 1 with a glue flow channel. The battery pack has a compact structure, and glue can be poured smoothly even when the gap between the liquid cooling plate and the battery cell group is small. At the same time, the liquid cooling plate also plays a role in heat exchange for the battery cell group.

[0070] Among them, the battery cell group includes at least one battery cell. When the battery cell group includes at least two battery cells, at least two battery cells are fixed together to form the battery cell group, and at least two battery cells in the battery cell group are connected in series or in parallel pairwise.

[0071] Among them, the battery cell group and the liquid cooling plate 1 can both be one; or the liquid cooling plate 1 is two, the battery cell group is one, and the battery cell group is sandwiched between the two liquid cooling plates 1; or the battery cell group and the liquid cooling plate 1 can both be multiple.

[0072] The assembly composed of the battery cell group and the liquid cooling plate 1 can be installed in the housing 3 in any direction. When the liquid cooling plate 1 adopts the solution of Embodiment 2 or Embodiment 3, preferably, the liquid cooling plate 1 is vertically installed in the housing 3, and glue pouring can be realized from the lower part of the liquid cooling plate upwards, which is beneficial to exhaust gas during the glue pouring process.

[0073] Embodiment 7

[0074] This embodiment provides a battery pack, which includes a battery cell group, a housing 3, and the liquid cooling plate described in any one of Embodiments 1 to 5. The battery cell group and the liquid cooling plate 1 are tightly arranged and installed in the housing 3.

[0075] The battery pack of this embodiment adopts a liquid cooling plate 1 with a glue flow channel. The structure of the battery pack is compact, and glue can be smoothly injected even when the gap between the liquid cooling plate and the battery cell group is small. At the same time, the liquid cooling plate also plays a role in heat exchange for the battery cell group.

[0076] Among them, the battery cell group includes at least one battery cell. When the battery cell group includes at least two battery cells, at least two battery cells are fixed together to form the battery cell group, and at least two battery cells in the battery cell group are connected in series or in parallel in pairs.

[0077] Both the battery cell group and the liquid cooling plate 1 are multiple. Multiple battery cell groups and multiple liquid cooling plates 1 are alternately and tightly arranged, with high heat exchange efficiency.

[0078] The assembly composed of the battery cell group and the liquid cooling plate 1 can be installed in the housing 3 in any direction. When the liquid cooling plate 1 adopts the solution of Embodiment 2 or Embodiment 3, preferably, the liquid cooling plate 1 is vertically installed in the housing 3, which can realize injecting glue from the lower part to the upper part of the liquid cooling plate, facilitating exhaust during the glue injection process.

[0079] Embodiment 8

[0080] As Figure 4 and Figure 5 shown, this embodiment provides a battery pack, which includes a battery cell group, a housing 3, and the liquid cooling plate described in any one of Embodiments 1 to 5. The battery cell group and the liquid cooling plate 1 are tightly arranged and installed in the housing 3.

[0081] The battery pack of this embodiment adopts a liquid cooling plate 1 with a glue flow channel. The structure of the battery pack is compact, and glue can be smoothly injected even when the gap between the liquid cooling plate and the battery cell group is small. At the same time, the liquid cooling plate also plays a role in heat exchange for the battery cell group.

[0082] Among them, the battery cell group includes at least one battery cell. When the battery cell group includes at least two battery cells, at least two battery cells are fixed together to form the battery cell group, and at least two battery cells in the battery cell group are connected in series or in parallel in pairs.

[0083] Both the battery cell group and the liquid cooling plate 1 are multiple. Two battery cell groups are tightly arranged on both sides of one liquid cooling plate 1 to form a battery cell - liquid cooling assembly, and multiple battery cell - liquid cooling assemblies are arranged side by side in the housing 3.

[0084] Two battery cell groups share one liquid cooling plate, which can achieve effective heat exchange while saving the number of liquid cooling plates, with a compact structure and low cost.

[0085] Example 9

[0086] Based on any one of Examples 6 to 8, a filler is further filled between the housing 3 and the battery cell group.

[0087] If the gap between the battery cell group and the housing is large, a filler can be filled to prevent a large amount of glue from flowing from the end of the battery cell group to the gap between the battery cell group and the housing. If the gap between the battery cell group and the housing is small and the amount of glue flowing into the gap between the battery cell group and the housing is small, thus having little impact on the glue filling in the gap between the battery cell group and the liquid cooling plate, then filling or not filling the filler can be selected.

[0088] Among them, the filler can be made of materials of any kind, such as plastics, rubbers, woods, etc. Preferably, materials with good thermal conductivity are selected, and the shape of the filler can be sheet-like, block-like or granular, etc.

[0089] Example 10

[0090] As Figure 6 shown, this embodiment provides a glue filling method for the battery pack according to any one of Examples 6 to 9, including the following steps:

[0091] Step 1: Arrange the battery cell group in close contact with the liquid cooling plate 1;

[0092] Step 2: Insert one end of the glue conduit 4 into the glue flow channel 2 from the glue inlet 21, and then place the battery cell group and the liquid cooling plate 1 into the housing 3; or, place the battery cell group and the liquid cooling plate 1 into the housing 3, and then insert the glue conduit 4 into the glue flow channel 2 from the glue inlet 21;

[0093] Step 3: Fill the glue flow channel 2 with glue through the glue conduit 4, and the glue overflows from the glue outlet 22 and fills the gap between the battery cell group and the liquid cooling plate 1.

[0094] Filling glue between the battery cell group and the liquid cooling plate 1 is convenient and applicable to the case where the gap between the two is small.

[0095] Specifically, the other end of the glue conduit 4 is communicated with a glue injection device, and the glue injection device fills the glue conduit 4 with glue at a set glue filling speed and glue filling pressure. The glue injection device can adopt existing glue injection machines or glue guns, etc.

[0096] Among them, the glue conduit 4 can be a rigid pipe or a flexible pipe.

[0097] Example 11

[0098] When the gap between the battery cell group and the housing 3 is small, the glue filling method can adopt the solution of Example 10 or the solution of this embodiment.

[0099] This embodiment provides a method for potting any one of the battery packs described in Embodiments 6 to 9, including the following steps:

[0100] Step 1: Arrange the battery cell group in close contact with the liquid cooling plate 1;

[0101] Step 2: Open a pipe-passing hole in the side wall of the housing 3, place the battery cell group and the liquid cooling plate 1 into the housing 3, and pass the glue conduit 4 through the pipe-passing hole and insert the glue flow path 2 from the glue inlet 21;

[0102] Step 3: Inject glue into the glue flow path 2 through the glue conduit 4, and the glue overflows from the glue outlet 22 and fills the space between the battery cell group and the liquid cooling plate 1.

[0103] It is convenient to inject glue between the battery cell group and the liquid cooling plate 1, and it is suitable for the case where the gap between them is small. This embodiment is particularly suitable for the case where the gap between the battery cell group and the housing 3 is small and it is not convenient to insert the glue conduit 4.

[0104] Specifically, the other end of the glue conduit 4 is connected to a glue injection device, and the glue injection device fills the glue conduit 4 with glue at a set glue injection speed and glue injection pressure. The glue injection device can be an existing glue injector or glue gun, etc.

[0105] Embodiment 12

[0106] This embodiment provides a method for potting the battery pack described in Embodiment 9, including the following steps:

[0107] Step 1: Arrange the battery cell group in close contact with the liquid cooling plate 1;

[0108] Step 2: Insert one end of the glue conduit 4 into the glue flow path 2 from the glue inlet 21, and then place the battery cell group and the liquid cooling plate 1 into the housing 3; or, place the battery cell group and the liquid cooling plate 1 into the housing 3, and then insert the glue conduit 4 into the glue flow path 2 from the glue inlet 21;

[0109] Step 3: Inject glue into the glue flow path 2 through the glue conduit 4, and the glue overflows from the glue outlet 22 and fills the space between the battery cell group and the liquid cooling plate 1.

[0110] It is convenient to inject glue between the battery cell group and the liquid cooling plate 1, and it is suitable for the case where the gap between them is small.

[0111] Specifically, the other end of the glue conduit 4 is connected to a glue injection device, and the glue injection device fills the glue conduit 4 with glue at a set glue injection speed and glue injection pressure. The glue injection device can be an existing glue injector or glue gun, etc.

[0112] Between Step 2 and Step 3, the following step is further included: Stuff a filler between the housing 3 and the battery cell group.

[0113] Embodiment 13

[0114] Based on any one of Embodiments 10 to 12, when the liquid cooling plate adopts the solution of Embodiment 4, that is, at least one side of the glue flow channel 2 has a plurality of the glue outlets 22 arranged at intervals, the specific steps of Step 3 include:

[0115] The other end of the glue conduit 4 pours a preset volume of glue at the position of the first glue outlet 22 near the other end of the glue flow channel 2. The glue overflows from the glue outlet 22 and fills the space between the battery cell group and the liquid cooling plate 1. Then the glue conduit 4 is withdrawn to the position of the next glue outlet 22 to continue pouring glue. According to the above method, the pouring operation of each glue outlet 22 is carried out in turn along the direction from the other end to one end of the glue flow channel 2 until the pouring of each glue outlet 22 is completed.

[0116] The interval between two adjacent glue outlets 22 and the preset volume of glue poured at each glue outlet 22 can be obtained through experiments. Specifically, the liquid cooling plate 1 and the battery cell group are both set as transparent plates for simulation experiments, and the overflow situation of the glue between the liquid cooling plate 1 and the battery cell group is observed, so as to adjust the interval between two adjacent glue outlets 22 and the preset volume of glue poured at each glue outlet 22, so that the gap between the liquid cooling plate 1 and the battery cell group can be completely filled after pouring a preset volume of glue at each glue outlet 22 position.

[0117] Embodiment 14

[0118] Based on any one of Embodiments 10 to 13, Step 4 may further be included after Step 3: Withdraw the glue conduit 4.

[0119] In the description of the present invention, it should be noted 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. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0120] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0121] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0122] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0123] In the description of the present invention, it should be noted that, unless otherwise clearly specified or limited, the terms "mounted", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0124] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for potting a battery pack, characterized in that, The liquid cooling plate (1) has a glue flow channel (2). At least one side of the glue flow channel (2) has at least one glue outlet (22) penetrating through the side wall of the liquid cooling plate (1). One end of the glue flow channel (2) has a glue inlet (21), and the other end is closed. The glue filling method includes the following steps: Step 1: Closely arrange the battery cell group and the liquid cooling plate (1). Step 2: Insert one end of the glue conduit (4) into the glue flow channel (2) from the glue inlet (21), and then place the battery cell group and the liquid cooling plate (1) into the housing (3); or, place the battery cell group and the liquid cooling plate (1) into the housing (3), and then insert the glue conduit (4) into the glue flow channel (2) from the glue inlet (21). Step 3: Fill the glue flow channel (2) with glue through the glue conduit (4), and the glue overflows from the glue outlet (22) and fills the space between the battery cell group and the liquid cooling plate (1).

2. A liquid cooling plate for implementing the glue filling method of the battery pack as described in claim 1.

3. The liquid cooling plate according to claim 2, wherein There is at least one of the glue flow channels (2), which is located at the lower part of the liquid cooling plate (1).

4. The liquid cooling plate according to claim 2, wherein, There are at least two of the glue flow channels (2), and at least two of the glue flow channels (2) are arranged at intervals from bottom to top, and one of the glue flow channels (2) is located at the lower part of the liquid cooling plate (1).

5. The liquid cooling plate according to any one of claims 2-4, characterized in that, At least one side of the glue flow channel (2) has a plurality of the glue outlets (22) arranged at intervals.

6. The liquid cooling plate according to any one of claims 2-4, characterized in that, The glue flow channel (2) is horizontally arranged.

7. A battery pack, characterized in that, It includes a battery cell group, a housing (3), and the liquid cooling plate as described in any one of claims 2 - 6. The battery cell group and the liquid cooling plate (1) are closely arranged and installed in the housing (3).

8. The battery pack according to claim 7, wherein Both the battery cell group and the liquid cooling plate (1) are multiple. Multiple battery cell groups and multiple liquid cooling plates (1) are alternately and closely arranged.

9. The battery pack according to claim 7, wherein, Both the battery cell group and the liquid cooling plate (1) are multiple. Two battery cell groups are closely arranged on both sides of one liquid cooling plate (1) to form a battery cell liquid cooling assembly, and multiple battery cell liquid cooling assemblies are arranged side by side in the housing (3).

10. A battery pack according to any one of claims 7-9, characterized in that, There is also a filler filled between the housing (3) and the battery cell group.

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