CN112421144B

CN112421144B - Battery module

Info

Publication number: CN112421144B
Application number: CN202011256831.7A
Authority: CN
Inventors: 陈智伟; 盛宁; 莫培荣; 徐博豪; 江吉兵
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2022-03-08
Anticipated expiration: 2040-11-11
Also published as: CN112421144A

Abstract

The invention discloses a battery module, which comprises a busbar, a heat conducting plate, a heat conducting pad and a plurality of battery cores, wherein the busbar is connected with a pole of each battery core, the heat conducting plate is arranged on the side surface of each battery core, heat exchange is carried out between the heat conducting plate and each battery core, and the heat conducting pad is clamped between the busbar and the heat conducting plate. The heat conduction pad makes the heat transfer of busbar to the heat-conducting plate on, all carry out the heat exchange between the heat-conducting plate of setting in electric core side and each electric core, make the heat transfer of busbar to each electric core, improved the homogeneity of each electric core temperature when reducing the busbar temperature, prevent that the battery module from sending out the police dispatch newspaper even stop work because of the busbar high temperature. The heat conducting pad is used as a connecting medium of the bus bar and the heat conducting plate, on one hand, the bus bar is prevented from directly contacting with the heat conducting plate, the bus bar can be insulated from the heat conducting plate, and on the other hand, the heat of the bus bar can be efficiently transferred to the heat conducting plate. Because each electric core uniformity in temperature is good, the battery module has longer cycle life.

Description

Battery module

Technical Field

The invention relates to the technical field of batteries, in particular to a battery module with uniform battery core temperature.

Background

The uniformity of each electric core has important influence to the cycle life of battery module in the battery module, and in the course of the work of battery module, each electric core all can produce certain heat, and the busbar is flowed through to the electric current that the electric core produced, also can lead to the busbar to generate heat, and the temperature of busbar often is higher than the temperature on electric core surface. If the temperature difference between each electric core is too big, will show the cycle life who reduces battery module.

Disclosure of Invention

The invention aims to provide a battery module, wherein each battery core in the battery module has better temperature uniformity, so that the battery module has longer cycle life.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a battery module, includes busbar, heat-conducting plate, heat conduction pad and a plurality of electric core, the busbar with the utmost point post of electric core is connected, the heat-conducting plate sets up the side of electric core, all carry out the heat exchange between heat-conducting plate and each electric core, the heat conduction pad is pressed from both sides and is established the busbar with between the heat-conducting plate.

In a preferred embodiment of the present invention, one surface of the heat conducting pad is bonded to the heat conducting plate, and the other surface of the heat conducting pad is bonded to the bus bar.

As a preferable scheme of the present invention, the battery module further includes a plastic rivet, the bus bar is provided with a first through hole, the heat conducting pad is provided with a second through hole, the heat conducting plate is provided with a third through hole, and the plastic rivet sequentially penetrates through the first through hole, the second through hole, and the third through hole.

As a preferable scheme of the invention, a groove structure is formed at a part where the heat conducting plate is connected with the heat conducting pad, a gap is formed between the heat conducting plate and the side surface of the battery core due to the groove structure, and one end of the plastic rivet is located in the gap.

As a preferable scheme of the invention, the busbar includes a plurality of bus bars arranged at intervals, each bus bar includes a first bus bar and a second bus bar, the first bus bar and the second bus bar are connected at an included angle, the first bus bar is connected with a pole of the battery cell, and the second bus bar is attached to the thermal pad.

As a preferable scheme of the present invention, the battery module further includes a temperature sensor, and the first bus bar is provided with a temperature sensing groove for mounting the temperature sensor.

As a preferable aspect of the present invention, the bus bar further includes a connecting plate, the connecting plate is used to connect two adjacent bus bars, and the connecting plate is arched or wavy.

As a preferable scheme of the present invention, a heat conducting glue is filled between the heat conducting plate and the side surface of the battery core.

As a preferable aspect of the present invention, a side of the heat conducting plate away from the bus bar is close to the bottom of the battery cell.

In a preferred embodiment of the present invention, a side surface of the battery cell is recessed toward the inside of the battery cell, and a recessed area for accommodating the thermal conductive adhesive is formed in the side surface of the battery cell.

The invention has the beneficial effects that:

according to the battery module, the heat of the busbar is transferred to the heat-conducting plate by the heat-conducting pad, and heat exchange is carried out between the heat-conducting plate arranged on the side surface of the battery cell and each battery cell, so that the heat of the busbar is transferred to each battery cell, the temperature uniformity of each battery cell is improved while the temperature of the busbar is reduced, and the battery module can be prevented from giving an alarm or even stopping working due to overhigh temperature of the busbar. The heat conducting pad is used as a connecting medium of the bus bar and the heat conducting plate, on one hand, the bus bar is prevented from directly contacting with the heat conducting plate, the bus bar can be insulated from the heat conducting plate, and on the other hand, the heat of the bus bar can be efficiently transferred to the heat conducting plate. In addition, the heat conducting plate can enable the temperature of each battery cell to be consistent. Because the consistency of each battery core on the temperature is better, the battery module has longer cycle life.

Drawings

Fig. 1 is a schematic front view of a battery module according to an embodiment of the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

fig. 3 is a schematic side view of a battery module according to an embodiment of the invention;

FIG. 4 is a schematic view of a plastic rivet in combination according to an embodiment of the present invention;

FIG. 5 is a schematic view of the plastic rivet of FIG. 4 shown separated;

FIG. 6 is a perspective view of a thermal conductive plate according to an embodiment of the present invention;

fig. 7 is a perspective view of a bus bar according to an embodiment of the invention.

In the figure:

1. a bus bar; 10. a first through hole; 11. a bus bar; 111. a first bus bar; 1111. a temperature sensing groove; 112. a second bus bar; 12. a connecting plate; 2. a heat conducting plate; 20. a groove structure; 21. a third through hole; 3. a thermally conductive pad; 4. an electric core; 5. plastic rivets; 51. a pin; 52. a sleeve; 521. an expansion part; 100. a void; 200. a recessed region.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the word "over" a first feature or feature in a second feature may include the word "over" or "over" the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under" a second feature may include a first feature that is directly under and obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

As shown in fig. 1 to 3, the battery module of an embodiment includes a busbar 1, a heat conducting plate 2, a heat conducting pad 3, and a plurality of battery cells 4, the busbar 1 is connected to a pole (not shown) of the battery cell 4, the heat conducting plate 2 is disposed on a side surface of the battery cell 4, heat exchange is performed between the heat conducting plate 2 and each battery cell 4, and the heat conducting pad 3 is sandwiched between the busbar 1 and the heat conducting plate 2.

The battery module of this embodiment utilizes heat conduction pad 3 to make the heat transfer of busbar 1 to heat-conducting plate 2 on, all carries out the heat exchange between heat-conducting plate 2 and each electric core 4 of setting to 4 sides of electric core, thereby make the heat transfer of busbar 1 to each electric core 4, improved the homogeneity of each electric core 4 temperature when reducing busbar 1 temperature, can prevent that the battery module from sending out the police dispatch newspaper even stop work because of 1 high temperature of busbar. The heat conducting pad 3 serves as a connecting medium between the bus bar 1 and the heat conducting plate 2, so that the bus bar 1 is prevented from directly contacting the heat conducting plate 2, the bus bar 1 can be insulated from the heat conducting plate 2, and the heat of the bus bar 1 can be efficiently transferred to the heat conducting plate 2. In addition, the heat conducting plate 2 can make the temperature of each battery cell 4 consistent. The battery module has a long cycle life because the temperature consistency of each battery cell 4 is good.

Furthermore, one surface of the heat conducting pad 3 is bonded to the heat conducting plate 2, and the other surface of the heat conducting pad 3 is bonded to the bus bar 1. In the actual assembling process of the battery module, the heat conducting pad 3 can be adhered to the heat conducting plate 2, after the heat conducting plate 2 is positioned, the heat conducting plate 2 is pressed, so that the other surface of the heat conducting pad 3 is adhered to the bus bar 1, the heat conducting plate 2 can be fixed, and the whole operation process is simple and easy to implement and low in cost.

The heat conducting pad 3 is made of elastic materials, and after the heat conducting pad is installed in place, the heat conducting pad 3 can be compressed in the thickness direction, so that the heat conducting pad 3 is in close contact with the bus bar 1 and the heat conducting plate 2, and a good heat conducting effect is achieved. In a specific embodiment, the thickness of the thermal pad 3 is 1.8 mm in the non-compressed state, and the thickness of the thermal pad 3 is 1.5 mm when mounted in place.

As shown in fig. 3 to 6, the battery module further includes a plastic rivet 5, a first through hole 10 is formed in the bus bar 1, a second through hole (not shown) is formed in the heat conducting pad 3, a third through hole 21 is formed in the heat conducting plate 2, and the plastic rivet 5 sequentially penetrates through the first through hole 10, the second through hole, and the third through hole 21. The plastic rivet 5 is a fastener for quick fastening, and is mainly applied to the occasion with low requirement on fastening strength, the plastic rivet 5 comprises a pin 51 and a sleeve 52, the pin 51 can be inserted into the sleeve 52, one end of the sleeve 52 is provided with an expansion part 521 which can be expanded, and after the pin 51 is inserted in place, the expansion part 521 can expand outwards to realize the limiting effect. The plastic rivet 5 is simple to use, and can be connected by penetrating the plastic rivet through the fixing holes of the two parts to be connected and then pressing the head of the pin 51 which is positioned at the opening on one side of the fixing hole to expand the expansion part 521 at the opening on the other side of the fixing hole. By adopting the plastic rivet 5, the connection among the bus bar 1, the heat conducting plate 2 and the heat conducting pad 3 can be firmer, and the plastic rivet 5 has good insulating property, so that the original insulating property can not be damaged.

As shown in fig. 2 and 6, the connection portion of the heat conducting plate 2 and the heat conducting pad 3 forms a groove structure 20, the groove structure 20 forms a gap 100 between the heat conducting plate 2 and the side surface of the battery cell 4, and one end of the plastic rivet 5 is located in the gap 100. Since the expansion 521 of the plastic rivet 5 needs to pass through the third through hole 21 before it can function, a certain space needs to be provided for the expansion 521, and therefore, the heat conducting plate 2 is bent to form the groove structure 20, so that the space 100 for accommodating the expansion 521 is formed between the heat conducting plate 2 and the side surface of the battery cell 4.

As shown in fig. 7, the busbar 1 includes a plurality of bus bars 11 arranged at intervals, each bus bar 11 includes a first bus bar 111 and a second bus bar 112, each first bus bar 111 is connected to each second bus bar 112 at an included angle, each first bus bar 111 is connected to a terminal of the corresponding battery cell 4, and each second bus bar 112 is attached to the corresponding thermal pad 3. At present, the electric core 4 adopted by most battery modules is a square lithium battery, and in order to make the current collecting piece 11 be well attached to the heat conducting pad 3 while being connected with the pole of the electric core 4, the current collecting piece 11 needs to be bent by an angle, so that the first current collecting plate 111 and the second current collecting plate 112 are generally connected in a right angle.

Further, the battery module further includes a temperature sensor (not shown), and the first bus bar 111 is provided with a temperature sensing groove 1111 for mounting the temperature sensor. The width and the depth of the temperature sensing groove 1111 are formed according to the size of the temperature sensor, so that on one hand, the side surface of the temperature sensor can also be in contact with the first bus plate 111, the contact area between the temperature sensor and the first bus plate 111 is increased, and the temperature collection is more effectively carried out; on the other hand, the temperature sensor does not protrude from the first bus plate 111, so that the probability that the temperature sensor is pressed by external force is reduced, and the reliability of the temperature sensor is improved.

As shown in fig. 7, the bus bar 1 further includes a connecting plate 12, the connecting plate 12 is used for connecting two adjacent bus bars 11, and the connecting plate 12 is arched or wavy. In the use of battery module, the inflation of certain degree can take place for electric core 4, because busbar 1 welds with the utmost point post of electric core 4 usually, the bulging force of electric core 4 can be dragged to busbar 1 production, makes busbar 1 take place deformation fracture even. The connecting plate 12 is in an arch or wave shape, and can deform when the bus bar 1 is pulled, so that cracks or fractures of the bus bar 1 caused by pulling are avoided, and the bus bar 1 has high reliability.

Further, a heat conducting glue (not shown in the figure) is filled between the heat conducting plate 2 and the side surface of the battery cell 4. The heat conducting plate 2 is usually configured to have a large area for achieving a good heat conducting effect, and as shown in fig. 1 and 3, the side of the heat conducting plate 2 away from the bus bar 1 is close to the bottom of the battery cell 4. Because of heat-conducting plate 2 has covered the great part of electric core 4 side, if heat-conducting plate 2 only fixes through heat conduction pad 3 in the one side of being connected with busbar 1, can make heat-conducting plate 2 stability relatively poor, therefore need fill heat-conducting glue between heat-conducting plate 2 and electric core 4, be used for further fixed heat-conducting plate 2. In addition, because the area of the heat conducting plate 2 is large, how well the heat conducting plate 2 contacts with the side surface of the battery core 4 to realize a good heat transfer effect is also a problem, and the heat conducting glue can fill the gap between the heat conducting plate 2 and the side surface of the battery core 4, so that a good heat transfer effect is obtained.

As shown in fig. 2, the side surface of the battery cell 4 is recessed toward the inside of the battery cell 4, and a recessed area 200 for accommodating a thermally conductive adhesive is formed on the side surface of the battery cell 4. When the heat-conducting plate 2 is installed, the depressed area 200 enables the heat-conducting glue to be limited in a certain area range, the heat-conducting glue cannot overflow uncontrollably due to the installation of the heat-conducting plate 2, the heat-conducting glue is prevented from adhering to unnecessary positions on the battery module, and the follow-up extra cleaning work on the heat-conducting glue is avoided.

Reference throughout this specification to the description of the terms "preferred," "further," or the like, as used in describing preferred embodiments of the present invention, means that a particular feature, structure, material, or characteristic described in connection with the example or illustration is included in at least one example or illustration of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above examples are only intended to illustrate the details of the invention, which is not limited to the above details, i.e. it is not intended that the invention must be implemented in such detail. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims

1. The utility model provides a battery module, its characterized in that includes busbar, heat-conducting plate, heat conduction pad, plastics rivet and a plurality of electric core, the busbar with the utmost point post of electric core is connected, the heat-conducting plate sets up the side of electric core, all carry out the heat exchange between heat-conducting plate and each electric core, the heat conduction pad is pressed from both sides and is established the busbar with between the heat-conducting plate, the heat conduction pad adopts insulating material preparation, first through-hole has been seted up on the busbar, the second through-hole has been seted up on the heat conduction pad, the third through-hole has been seted up on the heat-conducting plate, the plastics rivet runs through in proper order first through-hole the second through-hole with the third through-hole.

2. The battery module according to claim 1, wherein one surface of the thermal pad is bonded to the thermal conductive plate, and the other surface of the thermal pad is bonded to the bus bar.

3. The battery module according to claim 1 or 2, wherein the heat-conducting plate and the heat-conducting pad are connected to form a groove structure, the groove structure forms a gap between the heat-conducting plate and the side surface of the battery core, and one end of the plastic rivet is located in the gap.

4. The battery module according to claim 1 or 2, wherein the bus bar comprises a plurality of bus bars arranged at intervals, the bus bars comprise a first bus bar and a second bus bar, the first bus bar is connected with the second bus bar at an included angle, the first bus bar is connected with the poles of the battery cells, and the second bus bar is attached to the heat conducting pad.

5. The battery module according to claim 4, further comprising a temperature sensor, wherein the first bus bar is provided with a temperature sensing groove for mounting the temperature sensor.

6. The battery module according to claim 4, wherein the bus bar further comprises a connecting plate for connecting two adjacent bus bars, the connecting plate having an arch shape or a wave shape.

7. The battery module according to claim 1 or 2, wherein a heat-conducting glue is filled between the heat-conducting plate and the side surface of the battery core.

8. The battery module of claim 7, wherein a side of the thermally conductive plate away from the bus bar is proximate to a bottom of the cells.

9. The battery module of claim 7, wherein the side of the battery cell is recessed toward the inside of the battery cell, and a recessed area for accommodating the thermal conductive adhesive is formed on the side of the battery cell.