Battery pack

Abstract

The utility model provides a battery pack, which relates to the technical field of batteries and comprises a shell and a battery module, a containing cavity is formed in the shell, the battery module is arranged in the containing cavity, the containing cavity is filled with a cooling medium, and at least part of the battery module is immersed in the cooling medium; the side face of the shell is provided with a needling part, the needling part comprises a first through hole formed in the shell and an elastic sealing piece arranged at the first through hole, and the first through hole is communicated with the containing cavity. The battery pack provided by the utility model can effectively prevent thermal runaway and thermal spread in the acupuncture test process, improves the safety of the battery pack, further enables the battery pack to meet the test conditions of the acupuncture test, can ensure that the steel needle can stably pierce the shell in the acupuncture test process so as to pierce the battery module, reduces the liquid leakage condition, and improves the safety of the battery pack. The acupuncture test is facilitated, and the problem of material waste caused by damage to the shell is reduced.

Description

Technical Field

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

[0002] The needle penetration test is a test that simulates the thermal runaway process of the battery by artificially creating an internal short circuit in the battery. It is a rigorous battery pack test item. During the needle penetration test, corresponding safety measures must be taken to prevent dangerous situations such as short circuits, leakage or fire.

[0003] In the related art, because the test conditions are too harsh, battery packs using ordinary liquid cooling technology are difficult to meet the conditions of the needle penetration test, so the energy storage battery pack is usually ignored for the needle penetration test. Even if the energy storage battery pack is subjected to the needle penetration test, a conventional battery pack is usually used, which causes the battery pack shell and other components to be punctured during the test, thereby causing unnecessary waste of materials. Utility Model Content

[0004] The embodiment of the utility model provides a battery pack, which can ensure the safety during the needle penetration test, meet the conditions of the needle penetration test, and reduce unnecessary material waste.

[0005] An embodiment of the utility model provides a battery pack, comprising a housing and a battery module;

[0006] The housing is provided with a receiving cavity, the battery module is arranged in the receiving cavity, the receiving cavity is filled with a cooling medium, and the battery module is at least partially immersed in the cooling medium;

[0007] A puncture portion is disposed on the side of the shell, and the puncture portion includes a first through hole disposed on the shell and an elastic sealing member disposed at the first through hole, and the first through hole is communicated with the accommodating cavity.

[0008] In some embodiments, the battery module includes a battery cell and an end plate located on at least one side of the battery cell;

[0009] The end plate is provided with a second through hole, and the position of the second through hole corresponds to the position of the first through hole.

[0010] In some embodiments, the battery module further includes a thermal insulation pad located between the end plate and the battery cell.

[0011] In some embodiments, the battery module further includes fixing straps, and at least one of the fixing straps is disposed around the periphery of the end plate to bind the battery cell, the end plate, and the thermal insulation pad together.

[0012] In some embodiments, the first through hole is a circular through hole, and the second through hole is a waist-shaped hole; the position of the first through hole corresponds to one end of the second through hole in the length direction.

[0013] In some embodiments, a thermocouple connector is further provided on the side of the housing, and a wiring harness of the thermocouple connector passes through the housing.

[0014] In some embodiments, the thermocouple connector and the piercing portion are located on opposite sides of the housing, respectively.

[0015] In some embodiments, the housing includes a cover plate and a shell, and an explosion-proof valve is disposed on the cover plate.

[0016] In some embodiments, the battery pack further includes a fixing beam disposed in the housing, and the battery module is disposed above the fixing beam.

[0017] In some embodiments, a sealing gasket is disposed between the cover plate and the housing.

[0018] Beneficial effects of the embodiments of the utility model:

[0019] In an embodiment of the utility model, the battery pack includes a shell and a battery module. The shell is provided with a receiving cavity for receiving the battery module and a cooling medium. The battery module is immersed in the cooling medium. A puncture portion is provided on the side of the shell. The puncture portion includes a first through hole provided on the shell and an elastic seal provided at the first through hole. The utility model can effectively prevent thermal runaway and heat spread during the puncture test by adopting an immersion liquid cooling method, improve the safety of the battery pack, and make it feasible to pass the strict test conditions of the puncture test; the puncture portion is provided on the side of the shell, and the first through hole in the puncture portion can ensure that the steel needle can smoothly pierce the shell and then pierce the battery module during the puncture test. The elastic seal provided at the first through hole can ensure the sealing of the shell during the puncture process and reduce liquid leakage. Since the battery pack is provided with a specific puncture portion for the puncture test, it is conducive to the puncture test and reduces the material waste caused by the shell being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the exploded structure of a battery pack provided in an embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure of a battery pack provided by an embodiment of the utility model;

[0023] Figure 3 is a rear structural schematic diagram of a battery pack provided in an embodiment of the utility model;

[0024] Figure 4 It is a schematic diagram of the exploded structure of a battery module provided by an embodiment of the utility model;

[0025] Figure 5 It is a schematic diagram of the structure of the battery pack provided by the embodiment of the utility model when undergoing a needle penetration test.

[0026] Description of reference numerals:

[0027] 100. Battery pack; 1. Outer shell; 11. Shell; 111. Elastic seal; 112. Thermocouple connector; 12. Cover plate; 121. Explosion-proof valve; 2. Battery module; 21. Battery cell; 22. End plate; 221. Second through hole; 23. Insulation pad; 24. Fixing strap; 3. Fixing beam; 4. Sealing pad; 5. Steel needle. DETAILED DESCRIPTION

[0028] 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, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0029] The embodiment of the utility model provides a battery pack 100, comprising a housing 1 and a battery module 2;

[0030] The housing 1 is provided with a receiving cavity, the battery module 2 is arranged in the receiving cavity, the receiving cavity is filled with a cooling medium, and the battery module 2 is at least partially immersed in the cooling medium;

[0031] A puncture portion is disposed on the side of the housing 1 , and the puncture portion includes a first through hole disposed on the housing 1 and an elastic sealing member 111 disposed at the first through hole, wherein the first through hole is communicated with the accommodating cavity.

[0032] like Figure 1 and 2 As shown, a housing 1 is provided with a receiving cavity, a battery module 2 is provided in the receiving cavity, and the receiving cavity is filled with a cooling medium, so that the battery module 2 is at least partially immersed in the cooling medium, thereby realizing immersion liquid cooling, and a closed space is formed in the housing 1, which can prevent the cooling medium from leaking out. Immersion liquid cooling can effectively prevent the occurrence of thermal runaway and heat spread, thereby improving the safety of the battery pack 100 and enabling the battery pack 100 to pass the rigorous test conditions of the needle penetration test.

[0033] The battery module 2 may be partially immersed in the cooling medium or may be completely immersed in the cooling medium, thereby achieving immersion liquid cooling.

[0034] like Figure 1-3 As shown, a puncture portion is provided on the side of the shell 1, and the puncture portion includes a first through hole provided on the shell 1 and an elastic seal 111 provided at the first through hole, and the first through hole is connected to the accommodating cavity. When performing a puncture test, the steel needle 5 can pass through the elastic seal 111 at the first through hole, penetrate into the shell 1 through the first through hole connected to the accommodating cavity, and then pierce the battery module 2. By providing a specific puncture portion on the shell 1, it can be ensured that the steel needle 5 can smoothly pierce the shell 1 and then pierce the battery module 2 during the puncture test, and since the elastic seal 111 is provided at the first through hole of the puncture portion, the sealing of the shell 1 during the puncture process can be ensured, reducing or avoiding the problem of leakage.

[0035] Specifically, the outer shell 1 includes a top surface, a bottom surface and side surfaces, wherein the side surfaces include a large surface with a larger area and a small surface with a smaller area. The puncture portion can be arranged on the large surface of the outer shell 1, so as to facilitate puncturing the battery cell 21 in the battery module 2 during the puncture test.

[0036] The elastic seal 111 refers to a seal with certain elastic properties. During the needle puncture test, the steel needle 5 can smoothly puncture the elastic seal 111, and maintain good sealing performance under the elastic effect of the elastic seal 111, thereby reducing or avoiding the leakage of the cooling medium. For example, the elastic seal 111 can be a rubber plug, and further, can be preferably a rubber plug made of silicone.

[0037] The utility model designs a specific battery pack 100 structure for the puncture test, meets the test conditions of the puncture test, improves the convenience of the puncture test, saves material costs, and reduces the cost of the puncture test.

[0038] It should be understood that the housing 1 can be made of an aluminum housing with high strength and strong corrosion resistance, which can improve the structural strength and reduce the impact of the cooling medium on the housing 1 while achieving immersion liquid cooling.

[0039] In some embodiments, the battery module 2 includes a battery cell 21 and an end plate 22 located on at least one side of the battery cell 21;

[0040] The end plate 22 is provided with a second through hole 221 , and the position of the second through hole 221 corresponds to the position of the first through hole.

[0041] For example, Figure 4 As shown, the battery module 2 includes a battery cell 21 and end plates 22 arranged on both sides of the battery cell 21 . The end plates 22 arranged on both sides of the battery cell 21 can improve the structural strength of the battery module 2 and fix the battery cell 21 .

[0042] In order to facilitate the steel needle 5 to smoothly pierce the battery cell 21 during the puncture test, a second through hole 221 is provided on the end plate 22. The position of the second through hole 221 corresponds to the position of the first through hole. After the steel needle 5 pierces the outer shell 1 through the elastic seal 111 at the first through hole, it continues to pass through the second through hole 221 and then pierces the battery cell 21.

[0043] In some embodiments, Figure 4 As shown, the battery module 2 further includes a thermal insulation pad 23 , and the thermal insulation pad 23 is located between the end plate 22 and the battery cell 21 .

[0044] The end plate 22 is usually made of metal. When the needle puncture test is performed, the metal end plate 22 is in direct contact with the battery cell 21, which easily takes away a lot of heat, thereby affecting the accuracy of temperature measurement. For this reason, a heat insulation pad 23 is arranged between the end plate 22 and the battery cell 21 to reduce the heat generated by the battery cell 21 from the end plate 22. Dissipation, so that the temperature measurement conditions are more in line with the requirements of the needle puncture test. In addition, the heat insulation pad 23 can also serve as a buffer material to reduce the damage caused by the direct contact between the end plate 22 and the battery cell 21.

[0045] Exemplarily, the thermal insulation pad 23 may be made of thermal insulation aerogel.

[0046] In some embodiments, the battery module 2 further includes fixing straps 24 , and at least one of the fixing straps 24 is disposed around the periphery of the end plate 22 to bind the battery cell 21 , the end plate 22 , and the thermal insulation pad 23 together.

[0047] For example, Figure 4 As shown, the battery module 2 includes two fixing straps 24. The fixing straps 24 are arranged around the periphery of the end plate 22, so that the various components in the battery module 2 can be formed into a whole, thereby improving stability.

[0048] The fixing strap 24 may be a steel strap, which has a relatively high structural strength.

[0049] In some embodiments, the first through hole is a circular through hole, and the second through hole 221 is a waist-shaped hole; the position of the first through hole corresponds to one end of the second through hole 221 in the length direction. Figure 3 and 5 As shown, the position of the first through hole on the shell 1 deviates from the center line of the side of the shell 1, and the second through hole 221 in the end plate 22 is a waist-shaped hole. The position of the first through hole corresponds to one end of the second through hole 221 in the length direction, which makes it convenient for the steel needle 5 to obliquely pierce the battery cell 21 during the puncture test, and the steel needle 5 does not interfere with the end plate 22 during the puncture process.

[0050] Exemplarily, the opening diameter of the first through hole can be 70 mm, the distance from the bottom of the shell 1 is 130 mm, the center of the first through hole is 60 mm away from the center line of the large back surface of the shell 1, and the position of the first through hole corresponds to one end of the second through hole 221.

[0051] In some embodiments, a thermocouple connector 112 is further provided on the side of the housing 1 , and a wiring harness of the thermocouple connector 112 penetrates into the housing 1 .

[0052] The thermocouple can collect parameters such as temperature and voltage inside the shell 1 through the thermocouple connector 112 provided on the side of the shell 1, thereby obtaining test data in the acupuncture test. The thermocouple connector 112 provided on the shell 1 can detect the inside of the shell 1 while ensuring the sealing of the shell 1, thereby obtaining more accurate test data.

[0053] For example, Figure 1-3 As shown, the thermocouple connector 112 and the piercing portion are respectively located on the side surfaces of the housing 1 on opposite sides. For example, the thermocouple connector 112 is located on the front large surface of the housing 1, and the piercing portion is located on the back large surface of the housing 1. By arranging the thermocouple connector 112 and the piercing portion on opposite sides of the housing 1, the interference problem between the two can be reduced.

[0054] In some embodiments, the housing 1 includes a cover plate 12 and a shell 11 , and an explosion-proof valve 121 is disposed on the cover plate 12 .

[0055] In the embodiment of the utility model, the battery pack 100 adopts an immersion liquid cooling method. In order to facilitate the installation and replacement of the battery module 2 in the shell 1, the shell 1 includes a cover plate 12 and a shell 11; and a cooling medium is arranged in the shell 1. In order to alleviate the pressure on the structure of the shell 1 caused by thermal runaway during the needle penetration test and avoid the shell 1 from being seriously damaged during the test, an explosion-proof valve 121 is arranged on the cover plate 12. When the pressure in the shell 1 is too high, the pressure can be released through the explosion-proof valve 121.

[0056] In some embodiments, the battery pack 100 further includes a fixing beam 3 , wherein the fixing beam 3 is disposed in the housing 1 , and the battery module 2 is disposed above the fixing beam 3 .

[0057] Specifically, Figure 1 and 5 As shown, the fixing beam 3 is located at the bottom of the housing 1, and the battery module 2 is located above the fixing beam 3. The battery module 2 is elevated by the fixing beam 3 to facilitate full contact between the bottom of the battery module 2 and the cooling medium, further improving safety during the puncture test.

[0058] In some embodiments, a sealing gasket 4 is disposed between the cover plate 12 and the housing 11 .

[0059] The cover plate 12 and the housing 11 are connected to form a sealed space. In order to further improve the sealing performance and reduce the leakage problem, a sealing gasket 4 is arranged between the cover plate 12 and the housing 11.

[0060] The battery pack 100 provided by the utility model, on the one hand, ensures the safety during the puncture test by immersion liquid cooling and meets the test conditions of the puncture test. On the other hand, a specific puncture portion is designed on the outer shell 1, and a second through hole 221 is opened on the end plate 22 of the battery module 2 in cooperation with the puncture portion, so as to facilitate the puncture test and reduce or avoid the leakage of the cooling medium in the outer shell 1 during the puncture process, thereby avoiding the problem of the outer shell 1 structure being damaged due to the use of conventional battery packs and reducing the test cost.

[0061] like Figure 5 As shown, a second through hole 221 is provided on the end plate 22 of the battery module 2, and the position of the elastic seal 111 corresponds to one end of the second through hole 221 in the length direction. After the steel needle 5 pierces the elastic seal 111, it can pierce the battery cell 21 in a direction perpendicular to the battery module 2, or the steel needle 5 can be tilted toward the end away from the first through hole to obliquely pierce the battery cell 21. Since the second through hole 221 is a waist-shaped hole, the interference problem between the steel needle 5 and the end plate 22 during the piercing process is reduced, thereby improving the convenience of the puncture test.

[0062] It should be noted that in order to more clearly demonstrate the process of the acupuncture test, Figure 5 The structure of the housing 1 is hidden.

[0063] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery pack, characterized in that: Including housing and battery module; The housing is provided with a receiving cavity, the battery module is arranged in the receiving cavity, the receiving cavity is filled with a cooling medium, and the battery module is at least partially immersed in the cooling medium; A puncture portion is disposed on the side of the shell, and the puncture portion includes a first through hole disposed on the shell and an elastic sealing member disposed at the first through hole, and the first through hole is communicated with the accommodating cavity.

2. The battery pack according to claim 1, characterized in that: The battery module comprises a battery cell and an end plate located on at least one side of the battery cell; The end plate is provided with a second through hole, and the position of the second through hole corresponds to the position of the first through hole.

3. The battery pack according to claim 2, characterized in that: The battery module further includes a thermal insulation pad, which is located between the end plate and the battery cell.

4. The battery pack according to claim 3, characterized in that: The battery module also includes fixing straps, at least one of which is disposed around the periphery of the end plate to bind the battery cell, the end plate and the thermal insulation pad together.

5. The battery pack according to claim 2, characterized in that: The first through hole is a circular through hole, and the second through hole is a waist-shaped hole; the position of the first through hole corresponds to one end of the second through hole in the length direction.

6. The battery pack according to claim 1, characterized in that: A thermocouple connector is also provided on the side of the shell, and a wiring harness of the thermocouple connector penetrates into the shell.

7. The battery pack according to claim 6, characterized in that: The thermocouple connector and the piercing portion are respectively located on opposite sides of the housing.

8. The battery pack according to claim 1, characterized in that: The housing comprises a cover plate and a shell, and an explosion-proof valve is arranged on the cover plate.

9. The battery pack according to any one of claims 1 to 8, characterized in that: It also includes a fixed beam, which is arranged in the shell, and the battery module is arranged above the fixed beam.

10. The battery pack according to claim 8, characterized in that: A sealing gasket is arranged between the cover plate and the housing.

Images