Battery cell module and battery pack

Abstract

The utility model discloses a battery cell module and battery pack, the battery cell module comprises a liquid cooling plate and a battery cell, the side wall of the liquid cooling plate is provided with a glue groove, the glue groove is filled with a heat-conducting glue layer, and the battery cell is arranged on one side of the liquid cooling plate and is bonded with the heat-conducting glue layer. According to the utility model, the glue groove is formed in the side wall of the liquid cooling plate, so that the heat-conducting glue layer can be stably fixed on the side wall of the liquid cooling plate, and meanwhile, the side wall of the battery cell is adhered to the heat-conducting glue layer, so that the battery cell and the liquid cooling plate form a whole, and the connection stability of the liquid cooling plate and the battery cell is improved while the heat-conducting efficiency of the battery cell and the liquid cooling plate is ensured.

Description

Technical Field

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

[0002] As a power supply method for existing new energy electric vehicles, power batteries can achieve zero tail gas emissions and reduce environmental pollution compared to traditional fuel vehicles. The battery pack includes a battery box and a battery module. The battery module is composed of multiple battery cells. The battery module converts electrical energy into chemical energy during charging and converts chemical energy into electrical energy during discharging. Since the battery module generates a lot of heat during the charging and discharging process, in order to ensure the safety of the battery pack, a cooling plate is usually set at the bottom of the battery pack, that is, below the battery module, to reduce the overall temperature of the battery pack. At the same time, in order to avoid severe local heating of the battery cell leading to thermal runaway, large-surface liquid cooling is usually performed on the side of the battery cell to balance the temperature of the battery cell.

[0003] However, the existing liquid cooling plate and battery cell are in direct contact. Due to the limitations of the battery cell structure and battery pack structure, there may be a problem of inability to fit tightly between the battery cell and the liquid cooling plate, resulting in the liquid cooling plate being unable to effectively equalize the temperature of the battery cell, which can easily cause thermal runaway of the battery cell. Utility Model Content

[0004] The main purpose of the embodiments of the utility model is to provide a battery cell module and a battery pack, aiming to improve the technical problem in the prior art that there is a gap between the battery cell and the liquid cooling plate resulting in untimely heat conduction.

[0005] The embodiment of the utility model provides a battery cell module, comprising:

[0006] A liquid cooling plate, wherein a glue groove is provided on the side wall of the liquid cooling plate, and the glue groove is filled with a thermal conductive glue layer;

[0007] The battery core is arranged on one side of the liquid cooling plate and is bonded to the thermal conductive adhesive layer.

[0008] In some embodiments of the present utility model, the battery cell module includes a plurality of the battery cells, the plurality of the battery cells include at least a first battery cell and a second battery cell, and the first battery cell and the second battery cell are respectively arranged on both sides of the liquid cooling plate;

[0009] Glue grooves are provided on both side walls of the liquid cooling plate, and the first battery core and the second battery core are respectively bonded to the heat-conducting glue layers on the corresponding side walls of the liquid cooling plate.

[0010] In some embodiments of the present utility model, the battery cell module includes a plurality of the liquid cooling plates, the plurality of the liquid cooling plates include at least a first cooling plate and a second cooling plate, the first cooling plate is arranged on the surface of the second cooling plate, the first cooling plate and the second cooling plate are arranged vertically or obliquely, and a cooling liquid flow channel is arranged in the first cooling plate;

[0011] The adhesive groove is arranged on the side wall of the first cooling plate, the battery core is arranged on the second cooling plate and the side wall of the battery core is bonded to the thermal conductive adhesive layer on the first cooling plate.

[0012] In some embodiments of the present invention, the glue groove is disposed on the first cooling plate close to an end of the first cooling plate away from the second cooling plate.

[0013] In some embodiments of the present invention, the battery core is partially embedded in the glue groove along the thickness direction of the glue groove and bonded to the thermal conductive glue layer.

[0014] In some embodiments of the present invention, the liquid cooling plate includes a plate body and a current collector connected to the plate body, a plurality of flow channel cavities connected in sequence are arranged in the plate body, and the plurality of flow channel cavities are arranged one by one along the height direction of the liquid cooling plate;

[0015] The current collector has a liquid inlet nozzle and a liquid outlet nozzle, the liquid inlet nozzle is communicated with the liquid inlet port of the plate body, and the liquid outlet nozzle is communicated with the liquid outlet port of the plate body.

[0016] In some embodiments of the present invention, the battery module includes:

[0017] a first end plate;

[0018] The second end plate is arranged opposite to the first end plate, a plurality of the battery cells and a plurality of the liquid cooling plates are arranged between the first end plate and the second end plate, and one liquid cooling plate is arranged between every two battery cells.

[0019] In some embodiments of the present invention, the battery cell module also includes an annular steel belt, which is sleeved on the structure formed by the first end plate, the second end plate, the battery cell and the liquid cooling plate therebetween, to fix the first end plate, the second end plate, the battery cell and the liquid cooling plate therebetween as a whole.

[0020] In some embodiments of the present invention, the battery cell module further includes a bus assembly, which is disposed on the top of the battery cell and connected to the battery cell, and the annular steel belt is located between the bus assembly and the top of the battery cell.

[0021] The utility model also provides a battery pack, comprising:

[0022] The above-mentioned battery cell module; and

[0023] A battery box, wherein the battery cell module is arranged in the battery box.

[0024] The embodiment of the utility model provides a battery cell module and a battery pack, the battery cell module includes a liquid cooling plate and a battery cell, a glue groove is provided on the side wall of the liquid cooling plate, the glue groove is filled with a thermal conductive glue layer, and the battery cell is provided on one side of the liquid cooling plate and bonded to the thermal conductive glue layer on the liquid cooling plate. By providing a glue groove on the side wall of the liquid cooling plate, the thermal conductive glue layer can be firmly fixed on the side wall of the liquid cooling plate, and the side wall of the battery cell is bonded to the thermal conductive glue layer, so that the battery cell and the liquid cooling plate are formed into a whole, ensuring the thermal conductivity of the battery cell and the liquid cooling plate while improving the connection stability between the liquid cooling plate and the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 This is a schematic diagram of the positional relationship between the battery cell and the liquid cooling plate in the battery cell module of the first embodiment of the utility model;

[0027] Figure 2 This is a schematic diagram of the connection structure between the battery cell and the liquid cooling plate in the battery cell module of the first embodiment of the utility model;

[0028] Figure 3 This is a schematic diagram of the connection structure between the battery cell and the liquid cooling plate in the battery cell module of the second embodiment of the utility model;

[0029] Figure 4 A structural diagram of a battery cell and a liquid cooling plate in a battery cell module of a third embodiment of the utility model;

[0030] Figure 5 This is a schematic diagram of the connection relationship between the battery cell and the liquid cooling plate in the battery cell module of the third embodiment of the utility model;

[0031] Figure 6 This is a schematic diagram of the arrangement of the glue grooves in a liquid cooling plate according to an embodiment of the utility model;

[0032] Figure 7 This is a schematic diagram of the internal structure of a liquid cooling plate according to an embodiment of the utility model;

[0033] Figure 8 This is a schematic diagram of the structure of a battery cell module according to an embodiment of the utility model;

[0034] Fig. 9 This is a schematic diagram of the structure of a battery cell module of another embodiment of the utility model;

[0035] Fig.10 The figure is a schematic structural diagram of a battery pack according to an embodiment of the present utility model.

[0036] Figure numerals: 100, battery cell; 110, first battery cell; 120, second battery cell; 150, flow channel cavity; 160, current collector; 161, liquid inlet nozzle; 162, liquid outlet nozzle; 200, liquid cooling plate; 201, glue groove; 210, first cooling plate; 220, second cooling plate; 300, thermal conductive glue layer; 401, first end plate; 402, second end plate; 500, annular steel belt; 600, bus bar assembly; 10, battery cell module; 20, battery case. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0041] like Figure 1-Figure 10 As shown, the utility model provides a battery cell module 10, which includes a liquid cooling plate 200 and a battery cell 100, wherein a glue groove 201 is provided on the side wall of the liquid cooling plate 200, and a thermal conductive glue layer 300 is filled in the glue groove 201. The battery cell 100 is provided on one side of the liquid cooling plate 200 and connected to the thermal conductive glue layer 300.

[0042] It should be noted that the side walls of the battery cell 100 and the side walls of the liquid cooling plate 200 are both flat, so as to ensure that the side walls of the battery cell 100 can be bonded to the side walls of the liquid cooling plate 200. The surface of the thermal conductive adhesive layer 300 filled in the adhesive groove 201 is also flat, which is conducive to bonding with the side walls of the battery cell 100.

[0043] It can be understood that by providing the glue groove 201 on the side wall of the liquid cooling plate 200, the thermal conductive glue layer 300 can be firmly fixed on the side wall of the liquid cooling plate 200, and at the same time, the side wall of the battery cell 100 is bonded to the thermal conductive glue layer 300, so that the battery cell 100 and the liquid cooling plate 200 are formed into a whole, thereby ensuring the thermal conductivity of the battery cell 100 and the liquid cooling plate 200 while improving the connection stability between the liquid cooling plate 200 and the battery cell 100.

[0044] In some embodiments, the surface of the thermally conductive adhesive layer 300 is slightly higher than the surface of the liquid cooling plate 200 to ensure that the thermally conductive adhesive layer 300 is in full contact with the battery cell 100 .

[0045] In some embodiments, the size of the glue groove 201 is the same as the liquid cooling area in the liquid cooling plate 200, that is, the orthographic projection of the glue groove 201 on the side wall of the liquid cooling plate 200 is exactly the same as the orthographic projection of the liquid cooling area in the liquid cooling plate 200 on the side wall of the liquid cooling plate 200, so as to ensure that the thermal conductive glue layer 300 completely covers the liquid cooling area of ​​the liquid cooling plate 200, so that the liquid cooling area of ​​the liquid cooling plate 200 can dissipate heat to the battery cell 100 through the thermal conductive glue layer 300.

[0046] In some embodiments, the battery cell module includes a plurality of battery cells 100. The plurality of battery cells 100 at least includes a first battery cell 110 and a second battery cell 120. The first battery cell 110 and the second battery cell 120 are respectively disposed on two sides of the liquid cooling plate 200. Glue grooves 201 are provided on the side walls on both sides of the liquid cooling plate 200. The first battery cell 110 and the second battery cell 120 are respectively bonded to the heat-conducting glue layers 300 on the corresponding side walls of the liquid cooling plate 200.

[0047] That is, the first battery cell 110 is disposed on one side of the liquid cooling plate 200 and bonded to the heat-conducting glue layer 300 on this side wall. The second battery cell 120 is disposed on the side of the liquid cooling plate 200 away from the first battery cell 110 and bonded to the heat-conducting glue layer 300 on this side wall, forming an arrangement of "first battery cell 110 - liquid cooling plate 200 - second battery cell 120". The first battery cell 110, the liquid cooling plate 200 and the second battery cell 120 are connected through the heat-conducting glue layer 300 to form a whole.

[0048] In some embodiments, the battery cell module includes a plurality of liquid cooling plates 200. The plurality of liquid cooling plates 200 at least includes a first cooling plate 210 and a second cooling plate 220. The first cooling plate 210 is disposed on the surface of the second cooling plate 220. The first cooling plate 210 is connected to the surface of the second cooling plate 220. The first cooling plate 210 is disposed perpendicular or obliquely to the second cooling plate 220. A coolant flow channel is provided in the first cooling plate 210. A glue groove 201 is provided on the side wall of the first cooling plate 210. The battery cell 100 is disposed on the second cooling plate 220 and the side wall of the battery cell 100 is bonded to the heat-conducting glue layer 300 on the first cooling plate 210.

[0049] That is, the liquid cooling plate 200 has a "丄" - shaped structure. The first cooling plate 210 and the second cooling plate 220 are connected to each other and can conduct heat to each other, which is used to balance the temperature at each part of the battery cell 100 and make the temperature at each part of the whole battery cell 100 uniform. At the same time, the battery cell 100 is bonded to the heat-conducting glue layer 300 on the first cooling plate 210, connecting the battery cell 100 and the liquid cooling plate 200 into one body, which is convenient for improving the assembly efficiency of the battery pack.

[0050] In some embodiments, the second cooling plate 220 is a solid metal plate inside. By directly contacting the battery cell 100, the heat at the bottom of the battery cell 100 is conducted out, and at the same time, it cooperates with the first liquid cooling plate 200 to ensure that the temperature at each part of the battery cell 100 is uniform.

[0051] In some embodiments, the second cooling plate 220 is a structure with a coolant flow channel disposed therein. The coolant flow channel in the second cooling plate 220 is connected to the coolant flow channel in the first cooling plate 210. The coolant enters from the first cooling plate 210 and then flows out from the second cooling plate 220, thereby enabling the first cooling plate 210 and the second cooling plate 220 to achieve a better temperature equalization effect on the battery cell 100.

[0052] Furthermore, in some embodiments, the glue groove 201 is disposed at an end of the first cooling plate 210 away from the second cooling plate 220 .

[0053] It is understandable that, since the bottom of the battery cell 100 is arranged on the second cooling plate 220, under the action of gravity, the bottom of the battery cell 100 can be completely in contact with the second cooling plate 220, so the temperature of the bottom of the battery cell 100 can be transferred to the second cooling plate 220 in time. However, there may be a difference in the degree of fit between the side wall of the battery cell 100 and the side wall of the first cooling plate 210. Since the top of the battery cell 100 is far from the bottom, if there is no higher heat-conducting structure at the top of the battery cell 100 than at the bottom of the battery cell 100, the temperature of the top of the battery cell 100 will be higher than the bottom of the battery cell 100, resulting in a large temperature difference between the top and bottom of the battery cell 100. Therefore, when the size of the glue groove 201 is limited, the glue groove 201 is preferably arranged at a position of the first cooling plate 210 close to the top of the first cooling plate 210, that is, the thermally conductive glue layer 300 is closer to the top of the battery cell 100, so as to ensure that the heat at the top of the battery cell 100 can be transferred to the first cooling plate 210 in time.

[0054] Furthermore, in some embodiments, the glue groove 201 is arranged from the top of the first cooling plate 210 toward the second cooling plate 220, the length direction of the glue groove 201 is the same as the length direction of the liquid cooling plate 200, and the length of the glue groove 201 is the same as the length of the liquid cooling plate 200; the width direction of the glue groove 201 is the same as the width direction of the liquid cooling plate 200, and the width of the glue groove 201 is at least 0.5 times or more of the height of the liquid cooling plate 200, so that the thermal conductive glue layer 300 in the glue groove 201 can cover most of the area of ​​the side wall of the liquid cooling plate 200.

[0055] It can be understood that in order to allow the portion of the battery cell 100 away from the second cooling plate 220 to contact the first liquid cooling plate 200 as much as possible, the width of the glue groove 201 is set to be greater than or equal to half the height of the liquid cooling plate 200, that is, when the glue groove 201 is close to the top of the first cooling plate 210, it can cover most of the side wall of the battery cell 100 away from the second cooling plate 220, thereby ensuring the temperature equalization effect.

[0056] In some embodiments, the battery cell 100 is partially embedded in the adhesive groove 201 along the thickness direction of the adhesive groove 201 and bonded to the thermal conductive adhesive layer 300 .

[0057] Specifically, the distance between the inner walls of the glue groove 201 is greater than or equal to the length or height of the battery cell 100 .

[0058] That is, if the glue groove 201 includes a first groove wall and a second groove wall, and the first groove wall and the second groove wall are arranged along the length direction of the liquid cooling plate 200, then the distance between the first groove wall and the second groove wall is greater than or equal to the height of the battery cell 100, so as to ensure that the battery cell 100 can be partially embedded in the glue groove 201 along the thickness direction of the battery cell 100, forming a plug-in structure with the glue groove 201 while bonding with the thermal conductive glue layer 300, thereby improving the connection stability between the battery cell 100 and the liquid cooling plate 200.

[0059] If the first groove wall and the second groove wall are arranged along the height direction of the liquid cooling plate 200 , the distance between the first groove wall and the second groove wall is greater than or equal to the length of the battery cell 100 , so as to ensure that the battery cell 100 can be partially embedded in the glue groove 201 along the thickness direction of the battery cell 100 .

[0060] In some embodiments, the liquid cooling plate 200 includes a plate body and a current collector 160 connected to the plate body, a plurality of flow channel cavities 150 connected in sequence are arranged in the plate body, and the plurality of flow channel cavities 150 are arranged one by one along the height direction of the liquid cooling plate 200. The current collector 160 has a liquid inlet nozzle 161 and a liquid outlet nozzle 162, the liquid inlet nozzle 161 is connected to the liquid inlet port of the plate body, and the liquid outlet nozzle 162 is connected to the liquid outlet port of the plate body.

[0061] In some embodiments, the battery cell module 10 includes a first end plate 401 and a second end plate 402, and the second end plate 402 is arranged opposite to the first end plate 401. A plurality of battery cells 100 and a plurality of liquid cooling plates 200 are arranged between the first end plate 401 and the second end plate 402, and a liquid cooling plate 200 is arranged between every two battery cells 100.

[0062] In some embodiments, the battery cell module 10 includes a first end plate 401, a second end plate 402 and an annular steel belt 500. The annular steel belt 500 is sleeved on the structure formed by the first end plate 401, the second end plate 402, and the battery cell 100 and the liquid cooling plate 200 therebetween, fixing the first end plate 401, the second end plate 402, and the battery cell 100 and the liquid cooling plate 200 therebetween as a whole.

[0063] It can be understood that the first end plate 401, the second end plate 402, the battery cells 100 between the first end plate 401 and the second end plate 402, and the liquid cooling plate 200 are bundled into a whole by the annular steel belt 500 to form a battery cell module 10, which is convenient for assembly during the production process of the battery pack and also convenient for replacement of the battery cell module 10 when any problem occurs in the battery cell module 10.

[0064] In some embodiments, the battery cell module 10 further includes a bus assembly 600 , which is disposed on the top of the battery cell 100 and connected to the battery cell 100 , and the annular steel belt 500 is located between the bus assembly 600 and the top of the battery cell 100 .

[0065] The utility model also provides a battery pack, which includes a battery box 20 and the battery module 10 in the above embodiment, and the battery module 10 is arranged in the battery box 20. Since the battery pack has the battery module 10 in the above embodiment, it has some or all of the beneficial effects of the above battery module 10 embodiment, which will not be repeated here.

[0066] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the application concept of the present invention, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery cell module, characterized in that: include: A liquid cooling plate, wherein a glue groove is provided on the side wall of the liquid cooling plate, and the glue groove is filled with a thermal conductive glue layer; The battery core is arranged on one side of the liquid cooling plate and is bonded to the thermal conductive adhesive layer.

2. The battery cell module according to claim 1, characterized in that: The battery cell module includes a plurality of battery cells, the plurality of battery cells include at least a first battery cell and a second battery cell, and the first battery cell and the second battery cell are respectively arranged on both sides of the liquid cooling plate; Glue grooves are provided on both side walls of the liquid cooling plate, and the first battery core and the second battery core are respectively bonded to the heat-conducting glue layers on the corresponding side walls of the liquid cooling plate.

3. The battery cell module according to claim 1, characterized in that: The battery module includes a plurality of liquid cooling plates, the plurality of liquid cooling plates include at least a first cooling plate and a second cooling plate, the first cooling plate is arranged on the surface of the second cooling plate, the first cooling plate and the second cooling plate are arranged vertically or obliquely, and a cooling liquid flow channel is arranged in the first cooling plate; The adhesive groove is arranged on the side wall of the first cooling plate, the battery core is arranged on the second cooling plate and the side wall of the battery core is bonded to the thermal conductive adhesive layer on the first cooling plate.

4. The battery cell module according to claim 3, characterized in that: The glue groove is arranged at an end of the first cooling plate away from the second cooling plate.

5. The battery cell module according to claim 1, characterized in that: The battery core is partially embedded in the glue groove along the thickness direction of the glue groove and is bonded to the thermal conductive glue layer.

6. The battery cell module according to claim 1, characterized in that: The liquid cooling plate comprises a plate body and a current collector connected to the plate body, wherein a plurality of flow channel cavities connected in sequence are arranged in the plate body, and the plurality of flow channel cavities are arranged one by one along the height direction of the liquid cooling plate; The current collector has a liquid inlet nozzle and a liquid outlet nozzle, the liquid inlet nozzle is communicated with the liquid inlet port of the plate body, and the liquid outlet nozzle is communicated with the liquid outlet port of the plate body.

7. The battery cell module according to claim 1, characterized in that: The battery module comprises: a first end plate; The second end plate is arranged opposite to the first end plate, a plurality of the battery cells and a plurality of the liquid cooling plates are arranged between the first end plate and the second end plate, and one liquid cooling plate is arranged between every two battery cells.

8. The battery cell module according to claim 7, characterized in that: The battery cell module also includes an annular steel belt, which is sleeved on the structure formed by the first end plate, the second end plate, the battery cell therebetween, and the liquid cooling plate, to fix the first end plate, the second end plate, the battery cell therebetween, and the liquid cooling plate as a whole.

9. The battery cell module according to claim 8, characterized in that: The battery cell module further includes a bus bar assembly, which is disposed on the top of the battery cell and connected to the battery cell, and the annular steel belt is located between the bus bar assembly and the top of the battery cell.

10. A battery pack, characterized in that: include: The battery cell module according to any one of claims 1 to 9; as well as A battery box, wherein the battery cell module is arranged in the battery box.

Images