High-safety soft package battery cell with liquid circulation packaging structure

Abstract

The utility model discloses a high-safety soft package battery cell with a liquid circulation packaging structure, which is suitable for a soft package battery cell with positive and negative pole lugs positioned on the same side of a battery cell body, the liquid circulation packaging structure comprises a shell with an opening at one end and a support pad, and a gap is arranged between the battery cell body positioned in the shell and the shell. The gap is divided into an insulating area and a liquid circulating area provided with a liquid inlet and a liquid outlet through the supporting pad fixed on the battery cell body in a surrounding manner, and the liquid circulating area is communicated to an external circulating cooling system, so that heat dissipation is promoted; furthermore, the tabs and the end covers as well as the end covers and the shell can be stably fixed through the design that the tabs and the end covers are integrally formed through injection molding at the ends of the tabs, so that the structural strength of the soft package battery cell is enhanced, and the sealing performance of liquid packaging is enhanced through a glue injection process; and through the separated design of the circuit and the water path, the safety of the soft package battery core and the space utilization rate of the group are improved. The utility model has good sealing, pressure-bearing and insulating characteristics, and can effectively reduce the risk of failure.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery safety, and in particular relates to a high-safety soft-pack battery with a liquid circulation packaging structure. Background Art

[0002] There are currently two commonly used battery cell packaging methods, one is hard-shell packaging and the other is soft-pack packaging, which are called hard-shell cells and soft-pack cells respectively. Hard-shell cells are more often used as power battery cells because of their relatively simple grouping structure, easier installation of explosion-proof valves, and better heat dissipation. However, in contrast, hard-shell cells have low space utilization when grouped, so the energy density of single cells is not as high as that of soft-pack cells and they are heavier. However, if you want to use soft-pack cells with a slimmer volume and higher cell energy density as power battery cells, you have to face the problems of poor mechanical strength of soft-pack cells, complex grouping structure, difficult heat dissipation design, difficulty in designing explosion-proof devices, and higher manufacturing process requirements than hard-shell cells.

[0003] After searching, for hard-shell batteries, the existing Chinese invention application document with publication number CN2021113927487 discloses a battery thermal safety prevention and control device and method. "The device includes a battery box, a pressure control valve, a one-way valve, a liquefaction device, a flame-retardant porous material, fins, coolant, gas delivery pipelines and circulating liquid return pipelines." Since the hard-shell battery itself is simple and easy to design in grouping, it is also more convenient to set up an explosion-proof device. The above device is a battery box composed of multiple square hard-shell encapsulated batteries. However, soft-pack batteries have weaker mechanical strength and more difficult sealing processes, especially difficult grouping. The later group heat dissipation design is also complicated, so it is difficult to add explosion-proof devices related to hard-shell batteries to soft-pack batteries.

[0004] Traditional soft-pack batteries often use aluminum-plastic film as the outer insulating shell to seal the positive and negative pole ears. The size change is flexible and the cost is low. However, after long-term use, the soft-pack batteries have the problem of bulging. This is because when the soft-pack batteries have thermal runaway, the electrolyte generally partially vaporizes, causing the aluminum-plastic film to swell first. When the bulging reaches a certain degree, it will break the aluminum-plastic film package, causing the internal electrolyte to leak and take away a lot of heat. Although it is better than the hard-shell battery in terms of safety performance, if the electrolyte undergoes a violent oxidation or reduction decomposition reaction after the aluminum-plastic cracks, the flammable conductive particles will cause an internal short circuit, which may also cause spontaneous combustion and even more dangerous safety accidents. In other words, before applying soft-pack batteries to power batteries, it is necessary to note that the failure forms of soft-pack batteries usually include leakage, cracking, fire and explosion. Especially in the aviation field, battery cells are often in a state of high-load operation for a long time, so higher safety requirements are placed on the battery cells, requiring no open flames, toxic smoke, and violent runaway reactions. The safety of current soft-pack battery cells still has certain limitations.

[0005] In summary, the existing soft-pack battery cells have problems such as difficulty in adding explosion-proof devices, bulging leakage during thermal runaway, and electrolyte overheating and spontaneous combustion, which have become technical problems that need to be urgently solved by technical personnel in this field. Utility Model Content

[0006] In order to solve the problems existing in the prior art mentioned above, the purpose of the present invention is to provide a high-safety soft-pack battery cell with a liquid circulation packaging structure. The present invention has good liquid circulation packaging performance through the glue injection process and the one-piece molded end cover design, can effectively withstand pressure, has good insulation properties, and can effectively reduce the risk of failure.

[0007] In order to achieve the above purpose and other related purposes, the utility model adopts the following technical solutions:

[0008] The utility model provides a high-safety soft-pack battery cell with a liquid circulation packaging structure, comprising a battery cell body and positive and negative pole ears located on the same side of the battery cell body, characterized in that it also comprises a shell and a support pad, one end of the shell is open and hollow, the battery cell body is located in the shell, the positive and negative pole ears face the open end of the shell, a gap is provided between the shell and the battery cell body, the support pad is fixed on the battery cell body along the short axis direction of the battery cell body, the support pad is close to one end of the battery cell body where the positive and negative pole ears are provided, the support pad divides the gap into an insulating area and a liquid circulation area, the liquid circulation area is provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are both connected to an external circulation cooling system, so that circulating liquid circulates in the liquid circulation area, the insulating area is filled with potting glue, and the edge sealing between the positive and negative pole ears and the battery cell body is located in the insulating area.

[0009] As a preferred technical solution, it also includes an end cover, which includes an injection molded body and an embedded part, and the embedded part and the injection molded body are integrally formed by injection molding, and the injection molded body is provided with a tab groove for the positive and negative pole tabs to pass through, and the positive and negative pole tabs are fixedly connected to the injection molded body through the tab groove, and the embedded part includes a shell welding skeleton, the positioning protrusion is located on the shell welding skeleton, and the shell welding skeleton is fixedly connected to the left end face of the shell through the positioning protrusion.

[0010] As a preferred technical solution, the embedded part also includes an electrode welding skeleton, and the electrode welding skeleton includes a directly buried part for fixing the pole ear, one end of the directly buried part is located in the injection molding body, and the other end of the directly buried part extends outside the injection molding body. A pole ear groove for penetrating the pole ear is provided in the middle of the directly buried part, and the pole ear groove is annularly covered around the pole ear. The end cover is fixedly connected to the positive and negative pole ears through the electrode welding skeleton. Furthermore, a bending portion is also provided at one end of the directly buried part located in the injection molding body. Furthermore, the injection molding body is provided with a glue injection cavity, and the glue injection cavity connects the inner end face of the injection molding body and the end face of the directly buried part in the injection molding body. Furthermore, a glue injection hole and a glue overflow hole are provided on the end cover.

[0011] As a further preferred technical solution, it also includes a guide pad located in the liquid circulation area, the guide pad is fixed on the battery body along the long axis direction of the battery body, and divides the liquid circulation area into at least two guide channels. Furthermore, the liquid inlet and the liquid outlet are relatively arranged at the starting end and the end of the guide channel, so that the circulating liquid circulates in the guide channel The longest path is. Furthermore, the guide pad is U-shaped and the opening direction is the same as the opening direction of the shell. The turning area of ​​the guide pad abuts against the end face of the shell, and the liquid inlet and the liquid outlet are located on the right end face of the shell and are respectively located at two ends away from the abutment of the guide pad.

[0012] As described above, the utility model has the following beneficial effects:

[0013] (1) The utility model discloses a high-safety soft-pack battery cell with a liquid circulation packaging structure. The shell serves as a circulating liquid sealing container for the battery cell body and has a certain pressure-bearing capacity. Since the circulating liquid is sealed, short circuit and failure fire of the battery cell can be effectively avoided. Heat evaporates in the electrolyte to maintain the vaporization temperature of the circulating liquid, which will not exceed the vaporization temperature of the circulating liquid. Taking water as an example, the vaporization temperature of water is 100°C. At the same time, it has the function of buffering and shock absorption after being combined with a support pad, and since it is made of metal, it also has the function of heat conduction. After being preferably set to a rectangular shape, it is more convenient to stack and group the soft-pack batteries.

[0014] (2) The utility model provides a high-safety soft-pack battery cell with a liquid circulation packaging structure, which has good sealing, pressure-bearing and insulation properties through the injection molding process, and the end cover formed by injection molding can better fix the shell and the pole ear and realize the sealing between the pole ear and the end cover and the shell, thereby improving the safety of the soft-pack lithium battery during use.

[0015] (3) The utility model provides a high-safety soft-pack battery cell with a liquid circulation packaging structure. The welding strength is improved by welding the end cover and the shell. At the same time, the injection molding strength is improved by the special structure of the end cover and the electrode welding skeleton, thereby ensuring the safe use of the soft-pack battery cell and providing a mechanical strength basis for stacking. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of a high-safety soft-pack battery cell with a liquid circulation packaging structure without end covers in Example 1.

[0017] Figure 2 It is a right side view of the shell in Example 1 and Example 2.

[0018] Figure 3 It is a three-dimensional schematic diagram of a high-safety soft-pack battery cell with a liquid circulation packaging structure and an end cover in Example 2.

[0019] Figure 4 yes Figure 3 Front view with the shell removed.

[0020] Figure 5 yes Figure 4 A top view of the local structure of the connection between the end cover and the pole ear.

[0021] Figure 6 yes Figure 4 A front view of the local structure of the connection between the end cover and the pole ear.

[0022] Figure 7 It is a left side view of Example 2.

[0023] Figure 8 yes Figure 7 Schematic diagram of the inside of the middle end cover.

[0024] Fig. 9 This is an exploded view of the outside of the end cover.

[0025] Fig.10 It is a left view of a single electrode welding skeleton with a symmetrical L-shaped cross-section at the bending portion.

[0026] Fig.11 It is a front view of a single electrode welding skeleton with a symmetrical L-shaped cross-section of the bending portion.

[0027] Fig.12 It is a front view of a single electrode welding skeleton when the longitudinal section of the bending portion is a symmetrical straight line.

[0028] Fig.13 It is a front view of a single electrode welding skeleton when there is no bend.

[0029] Among them, the specific descriptions of the accompanying drawings are as follows: 1. battery cell body; 11. pole ear; 12. edge sealing; 2. shell; 3. support pad; 31. insulation area; 32. liquid circulation area; 4. guide pad; 41. turning area; 5. end cover; 51. injection molding body; 511. injection cavity; 52. shell welding frame; 521. positioning protrusion; 53. electrode welding frame; 531. direct buried part; 532. bending part; 533. pole ear groove; 61. injection hole; 62. overflow hole; 71. liquid inlet; 72. liquid outlet. DETAILED DESCRIPTION

[0030] In order to better understand the purpose, structure and function of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0031] In the description of the present invention, it should be noted that the positional relationships indicated by terms such as “longitudinal”, “lateral”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” cited in this specification are based on the positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0032] Example 1

[0033] like Figure 1 and Figure 2 As shown, this embodiment provides a high-safety soft-pack battery cell with a liquid circulation packaging structure without an end cover 5, the soft-pack battery cell comprising a battery cell body 1 and positive and negative pole tabs 11, the positive and negative pole tabs 11 are located at the ends of the pole tabs 11 of the battery cell body 1 and are fixed to the battery cell body 1 through edge sealing 12, the positive and negative pole tabs 11 include a positive pole tab 11 and a negative pole tab 11, the positive pole tab 11 and the negative pole tab 11 are located on the left side of the battery cell body 1, the high-safety soft-pack battery cell also includes a hollow shell 2 with an opening at one end, a support pad 3 and a guide pad 4.

[0034] The shell 2 can be made of rectangular metal. In another preferred embodiment, the shell 2 is made of super martensitic stainless steel, which has better toughness and corrosion resistance. The battery cell body 1 is located in the shell 2, and the positive and negative pole tabs 11 are facing the open end of the shell 2. A gap is provided between the shell 2 and the battery cell body 1, which provides space for the circulation of circulating liquid and the insulation packaging of the tab 11 end. In addition, the rectangular design of the shell 2 facilitates the stacking of multiple soft-pack batteries, thereby increasing space utilization.

[0035] The support pad 3 is fixed around the battery body 1 along the short axis direction of the battery body 1. The support pad 3 is close to one end of the battery body 1 where the positive and negative pole tabs 11 are provided. The support pad 3 divides the gap into an insulating area 31 and a liquid circulation area 32. The support pad 3 provides shock-absorbing support for the battery body 1 and also plays a role in partitioning and ensuring sealing. The liquid circulation area 32 is provided with a liquid inlet 71 and a liquid outlet 72, and the liquid inlet 71 and the liquid outlet 72 are both connected to the external circulation cooling system, so that circulating liquid circulates in the liquid circulation area 32; in another embodiment, the liquid inlet 71 and the liquid outlet 72 are only connected to the external water tank, and the liquid outlet 72 is provided with a vent valve for exhausting or discharging when the internal pressure increases. The insulating area 31 is filled with potting glue, and the edge sealing 12 between the positive and negative electrode tabs 11 and the battery body 1 is located in the insulating area 31. The outer end surface of the solidified potting glue is flush with the outer end surface of the opening of the shell 2. The circulating liquid in the liquid circulation area 32 is isolated from the tab 11 end of the battery body 1 by injection, thereby ensuring the insulation at the positive and negative electrode tabs 11.

[0036] Since the surface of the edge seal 12 of the soft-pack battery cell is generally irregular, after fixing the support pad 3, in order to further ensure the sealing of the circulating liquid packaging area and the edge seal 12 structure, the potting glue is injected into the insulating area 31. This can increase the structural strength between each support pad 3 and the battery body 1 and the structural strength of the soft-pack battery edge seal 12, thereby reducing the risk of circulating liquid contacting the pole ear 11 when the soft-pack battery cell fails, and also reduce the risk of cracking and leakage when bulging.

[0037] The potting glue includes but is not limited to epoxy resin potting glue; the circulating liquid may be an insulating liquid or water, and the insulating liquid includes but is not limited to fluorinated liquid, ultrapure water or deionized water. In this embodiment, the use of insulating liquid in a single soft-pack battery cell can further ensure the safety of use and avoid failure and fire caused by short circuit. In another embodiment, a plurality of the soft-pack batteries are stacked and connected in parallel to the same external circulation cooling system. When a certain soft-pack battery cell bulges and ruptures, the electrolyte in the battery cell leaks out from the rupture and is diluted into the circulating water, thereby affecting the insulation performance of the circulating liquid. However, since the end sealing edge 12 of the pole ear 11 of the soft-pack battery cell in this application has been reinforced with double-layer insulation through the support pad 3 and the glue injection process, the contact between the circulating liquid and the pole ear 11 can be effectively avoided. Therefore, in order to save costs, the soft-pack battery cell uses water as the circulating liquid in the stacked parallel state.

[0038] The guide pad 4 is located in the liquid circulation area 32 and is fixed on the battery cell body 1 along the long axis direction of the battery cell body 1. The guide pad 4 is U-shaped, and the U-shaped opening is oriented in the same direction as the opening of the shell 2. The inner side of the guide pad 4 is in contact with the outer side of the battery cell body 1, and the outer side of the guide pad 4 is in contact with the inner side of the shell 2. The liquid circulation area 32 is divided into two one-way connected guide channels by the guide pad 4. The liquid inlet 71 is arranged at the starting end of the guide channel, and the liquid outlet 72 is arranged at the end of the guide channel relative to the liquid inlet 71, so that the circulating liquid has the longest circulation path in the guide channel, which can effectively ensure that the circulating liquid flows through the surface of the battery cell body 1 in the liquid circulation area 32, and promotes the heat dissipation of the battery cell body 1 through the circulation of the liquid, thereby improving the safety of the soft-pack battery. In this embodiment, the opening of the shell 2 faces the left side, the U-shaped turning area 41 of the guide pad 4 abuts against the inner wall of the right end face of the shell 2, the liquid inlet 71 and the liquid outlet 72 are located on the right end face of the shell 2 and are respectively located at two ends away from the abutment of the guide pad 4. By arranging the liquid inlet 71 and the liquid outlet 72 on the opposite side of the pole ear 11 end, it is beneficial to stack multiple soft-pack battery cells and improve space utilization. At the same time, due to the relative arrangement of the pole ear 11 end and the liquid inlet and outlet, the circuit and the water path can be relatively distributed and laid out to ensure the isolation of the circuit and the water path, thereby improving the safety of the soft-pack battery cells during use.

[0039] The safety working mechanism of this embodiment is specifically as follows: the positive and negative pole ears 11 of the battery cell are isolated from the circulating liquid through the glue injection process, so that the soft-pack battery cell body 1 is directly immersed in the circulating liquid, and is connected to the liquid storage tank through the liquid inlet 71 and the liquid outlet 72 on the end cover 5, and is connected to the external circulation cooling system, so that when the soft-pack battery cell fails, the circulating liquid can flow and circulate in the liquid circulation area 32 separated by the guide pad 4 to reduce the reaction rate of electrolyte redox and gasification; if the reaction intensifies and causes cracking, the electrolyte enters the circulating liquid from the crack of the aluminum-plastic film, is circulated and diluted and brought into the liquid storage tank, and the circulating liquid can also circulate Heat is taken away, which can further reduce the reaction of the electrolyte; in extreme cases, the internal heat consumes all the circulating liquid to produce gas, and the gas is discharged through the drain valve arranged on the circulating cooling system, which can ensure that there is no impact on the outside of the shell 2; if the violent reaction causes a fire in the soft-pack battery cell, the circulating liquid can also play a role in fire fighting, and directly control the fire in the relatively sealed circulating packaging structure; during the whole process, when the internal pressure of the shell 2 increases due to the generation of gas by the electrolyte or the bulging of the battery, the pressure can be relieved through the drain valve, and the drain valve will automatically close after the pressure is reduced. The gas or circulating liquid discharged during the pressure relief can be collected into the waste liquid collection tank.

[0040] Furthermore, since the circulating liquid circulation end of the soft-pack battery cell is located on the opposite side of the pole ear 11 end, and combined with the shape of the shell 2, multiple soft-pack battery cells can be stacked and connected to the same circulating cooling system, so that the power circuit related to the pole ear 11 is located on the left, and the water circuit related to the circulating cooling system is located on the right, thereby improving space utilization; and the state of the soft-pack battery cell is evaluated by conducting conductivity detection in the liquid storage tank. If a pressure sensor and a temperature sensor are provided in the circulating cooling system, real-time monitoring can also be achieved to improve safety.

[0041] Example 2

[0042] like Figure 2-Figure 13 As shown, this embodiment provides a high-safety soft-pack battery cell with a liquid circulation packaging structure and an end cover 5 on the basis of Embodiment 1, wherein the soft-pack battery cell comprises a battery cell body 1 and positive and negative pole tabs 11, wherein the positive and negative pole tabs 11 are located at the ends of the pole tabs 11 of the battery cell body 1 and are fixed to the battery cell body 1 through edge sealing 12, wherein the positive and negative pole tabs 11 comprise a positive pole tab 11 and a negative pole tab 11, wherein the positive pole tab 11 and the negative pole tab 11 are located on the left side of the battery cell body 1, and the high-safety soft-pack battery cell further comprises a shell 2, a support pad 3, a guide pad 4 and an end cover 5.

[0043] The shell 2, support pad 3 and guide pad 4 are the same as those in Embodiment 1 and are not described in detail here.

[0044] The end cover 5 includes an injection molded body 51 and an embedded part. The embedded part and the injection molded body 51 are integrally formed by injection molding. The injection molded body 51 is provided with a tab groove 533 for the positive and negative pole tabs 11 to pass through. The positive and negative pole tabs 11 are fixedly connected to the injection molded body 51 through the tab groove 533. The embedded part includes a shell welding skeleton 52 and an electrode welding skeleton 53. The shell welding skeleton 52 is a rectangular metal plate that matches the shape and size of the opening end face of the shell 2. The inner side of the rectangular metal plate is provided with an annular positioning protrusion 521. The positioning protrusion 521 is close to the edge position of the shell welding skeleton 52, corresponding to the shape and position of the edge of the end face of the shell 2. The center position of the shell welding skeleton 52 is provided with a positioning protrusion for the injection molded body 5 1 and an injection molding groove 533 fixedly connected, the shell welding skeleton 52 is fixedly connected to the left end face of the shell 2 through a positioning protrusion 521, the electrode welding skeleton 53 includes a directly buried portion 531 for fixing the pole ear 11, one end of the directly buried portion 531 is located in the injection molding body 51, and the other end of the directly buried portion 531 extends to the outside of the injection molding body 51, and the shape of the directly buried portion 531 includes but is not limited to a rectangular, elliptical or runway shape, a pole ear groove 533 for penetrating the pole ear 11 is opened in the middle of the directly buried portion 531, the pole ear groove 533 is annularly covered around the pole ear 11, and the shape of the cross section of the pole ear groove 533 includes a rectangular, elliptical or runway shape, and the end cover 5 is fixedly connected to the positive and negative pole ears 11 through the electrode welding skeleton 53.

[0045] In the actual manufacturing process, the pole lug 11 passes through the pole lug groove 533, and the buried part 531 is pressed up and down to crimp the buried part 531 and the pole lug 11, and then the pole lug 11 is welded and fixed to the buried part 531. The welding method of the pole lug 11 and the buried part 531 includes but is not limited to resistance welding, laser welding or ultrasonic welding. In order to prevent the electrode welding skeleton 53 from being separated from the injection molding body 51 due to deformation during the crimping process, thereby affecting the sealing, therefore, in this embodiment, a bending portion 532 is also provided at the end of the buried part 531, so that the cross-section of the electrode welding skeleton 53 is symmetrical L-shaped or symmetrical hook-shaped; and the injection molding body 51 is provided with a glue injection cavity 511 from the end of the electrode welding skeleton 53 to the inner end face of the injection molding body 51, and the pressure bearing capacity is further increased by the glue injection process, which can effectively prevent the battery body 1 from pulling the electrode inward when the battery cell is over-expanded, thereby improving the insulation effect.

[0046] The shape of the shell 2 can be adaptively changed according to the setting space or group stacking requirements to maximize space utilization. The shape of the support pad 3 matches the shape of the gap between the shell 2 and the battery cell body 1. In this embodiment, the shell 2 is made of rectangular metal. The rectangular design can be more convenient for subsequent stacking, and the packaging sealing strength of the structure can be enhanced by welding and fixing between metals. The shell 2 is open at one end and hollow, the battery body 1 is located in the shell 2, the positive and negative pole tabs 11 face the open end of the shell 2, a gap is provided between the shell 2 and the battery body 1, the support pad 3 is fixed around the battery body 1 along the short axis direction of the battery body 1, the support pad 3 is close to one end of the battery body 1 where the positive and negative pole tabs 11 are provided, the support pad 3 separates the gap into an insulating area 31 and a liquid circulation area 32, the liquid circulation area 32 is provided with a liquid inlet 71 and a liquid outlet 72, the liquid inlet 71 and the liquid outlet 72 are both connected to the external circulation cooling system, so that circulating liquid circulates in the liquid circulation area 32, the insulating area 31 is filled with potting glue, and the edge sealing 12 between the positive and negative pole tabs 11 and the battery body 1 is located in the insulating area 31. In order to facilitate the filling of potting glue, the end cover 5 is provided with a glue injection hole 61 and a glue overflow hole 62.

[0047] The safe working mechanism of this embodiment is specifically as follows: on the basis of embodiment 1, by combining the injection process with the special structure of the integrally formed end cap 5, the metal shell welding skeleton 52 and the electrode welding skeleton 53 are respectively welded and connected with the metal shell 2 and the pole ear 11 for reinforcement, which can prevent the positive and negative pole ears 11 from being stretched inward when the battery body 1 is bloated, and finally strengthen the strength and sealing of the packaging structure, while further ensuring that the positive and negative pole ears 11 are isolated from the circulating liquid. The above description is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Those skilled in the art are aware that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the utility model. In addition, under the guidance of the utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the utility model.

Claims

1. A high-safety soft-pack battery cell with a liquid circulation packaging structure, comprising a battery cell body (1) and positive and negative electrode tabs (11) located on the same side of the battery cell body (1), characterized in that: The battery cell body (1) further comprises a shell (2) and a support pad (3), wherein one end of the shell (2) is open and hollow, the battery cell body (1) is located in the shell (2), the positive and negative electrode tabs (11) face the open end of the shell (2), a gap is provided between the shell (2) and the battery cell body (1), the support pad (3) is fixed on the battery cell body (1) along the short axis direction of the battery cell body (1), the support pad (3) is close to one end of the battery cell body (1) where the positive and negative electrode tabs (11) are provided, and the battery cell body (1) is provided with a positive electrode tab (11). The support pad (3) divides the gap into an insulating area (31) and a liquid circulation area (32); the liquid circulation area (32) is provided with a liquid inlet (71) and a liquid outlet (72); the liquid inlet (71) and the liquid outlet (72) are both connected to an external circulation cooling system, so that circulating liquid circulates in the liquid circulation area (32); the insulating area (31) is filled with potting glue, and the sealing edge (12) between the positive and negative electrode tabs (11) and the battery cell body (1) is located in the insulating area (31).

2. A high-safety soft-pack battery cell with a liquid circulation packaging structure according to claim 1, characterized in that: The invention also comprises an end cover (5), the end cover (5) comprising an injection molded body (51) and an embedded part, the embedded part and the injection molded body (51) being integrally formed by injection molding, the injection molded body (51) being provided with a tab slot (533) for the positive and negative pole tabs (11) to pass through, the positive and negative pole tabs (11) being fixedly connected to the injection molded body (51) via the tab slot (533), the embedded part comprising a shell welding frame (52), the shell welding frame (52) being provided with a positioning protrusion (521), the shell welding frame (52) being fixedly connected to the left end face of the shell (2) via the positioning protrusion (521).

3. A high-safety soft-pack battery cell with a liquid circulation packaging structure according to claim 2, characterized in that: The embedded part also includes an electrode welding frame (53), the electrode welding frame (53) includes a direct buried portion (531) for fixing the pole lug (11), one end of the direct buried portion (531) is located in the injection molded body (51), and the other end of the direct buried portion (531) extends outside the injection molded body (51), a pole lug groove (533) for penetrating the pole lug (11) is provided in the middle of the direct buried portion (531), the pole lug groove (533) is annularly wrapped around the pole lug (11), and the end cover (5) is fixedly connected to the positive and negative pole lugs (11) through the electrode welding frame (53).

4. A high-safety soft-pack battery cell with a liquid circulation packaging structure according to claim 3, characterized in that: A bent portion (532) is also provided at one end of the directly buried portion (531) located in the injection molded body (51).

5. A high-safety soft-pack battery cell with a liquid circulation packaging structure according to claim 4, characterized in that: The injection body (51) is provided with a glue injection cavity (511), and the glue injection cavity (511) is connected to the inner end surface of the injection body (51) and the end surface of the directly buried part (531) in the injection body (51).

6. A high-safety soft-pack battery cell with a liquid circulation packaging structure according to any one of claims 2 to 5, characterized in that: The end cover (5) is provided with a glue injection hole (61) and a glue overflow hole (62).

7. A high-safety soft-pack battery cell with a liquid circulation packaging structure according to claim 6, characterized in that: It also includes a flow guide pad (4) located in the liquid circulation area (32), wherein the flow guide pad (4) is fixed to the battery cell body (1) along the long axis direction of the battery cell body (1) to separate the liquid circulation area (32) into at least two flow guide channels.

8. The high-safety soft-pack battery cell with a liquid circulation packaging structure according to claim 7, characterized in that: The liquid inlet (71) and the liquid outlet (72) are arranged at the starting end and the end of the diversion flow channel relative to each other, so that the path of the circulating liquid circulating in the diversion flow channel is the longest.

9. A high-safety soft-pack battery cell with a liquid circulation packaging structure according to claim 8, characterized in that: The guide pad (4) is U-shaped and has an opening facing the same direction as the opening of the shell (2); the turning area (41) of the guide pad (4) abuts against the end surface of the shell (2); the liquid inlet (71) and the liquid outlet (72) are located on the right end surface of the shell (2) and are respectively located at two ends away from the abutment of the guide pad (4).

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