Battery cover with liquid injection guide structure

Abstract

The application discloses a battery cover with liquid injection flow guide structure, which comprises an aluminum plate and an insulating pad. The left and right ends of the aluminum plate are provided with cover plate negative electrode mounting holes and cover plate positive electrode mounting holes. The insulating pad is provided with insulating pad negative electrode mounting holes and insulating pad positive electrode mounting holes. The upper part of the cover plate negative electrode mounting hole is provided with a negative electrode plastic pad. The upper part of the cover plate positive electrode mounting hole is provided with a positive electrode plastic pad. The cover plate negative electrode mounting hole and the cover plate positive electrode mounting hole are embedded with negative electrode sealing rings and positive electrode sealing rings respectively. The negative electrode plastic pad, the cover plate negative electrode mounting hole, the negative electrode sealing ring and the insulating pad negative electrode mounting hole are riveted through a negative electrode post. The positive electrode plastic pad, the cover plate positive electrode mounting hole, the positive electrode sealing ring and the insulating pad positive electrode mounting hole are riveted through a positive electrode post. The aluminum plate is provided with a liquid injection hole. The insulating pad is provided with a flow guide hole. A flow guide plate is arranged on the flow guide hole. The application can improve the battery production efficiency by increasing the electrolyte injection pressure, guarantee the battery liquid injection quality and avoid the battery quality problems.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cover with liquid injection flow guide structure. BACKGROUND

[0002] With the development of science and technology, square batteries are used in many fields, among which the largest demand is in the fields of power, energy storage and two-wheeled vehicles.

[0003] At present, in the production process of square battery products, the liquid injection efficiency of the battery directly affects the production efficiency of the battery. In order to speed up the battery liquid injection efficiency, most battery manufacturers realize it by increasing the liquid injection pressure.

[0004] However, after increasing the liquid injection pressure of the battery, the flow rate of the liquid injection becomes fast, the kinetic energy of the electrolyte becomes large, and thus the impact force on the battery pole group also increases, resulting in some pole groups being affected by the impact force of the electrolyte and causing problems such as falling powder and material shortage of the pole piece.

[0005] Therefore, it is urgent to develop a technology to solve the above technical problems. SUMMARY

[0006] The purpose of the present application is to provide a battery cover with liquid injection flow guide structure to solve the technical defects of the prior art.

[0007] To this end, the present application provides a battery cover with liquid injection flow guide structure, which comprises an upper and lower light aluminum plate and an insulating pad.

[0008] The left and right ends of the light aluminum plate are respectively provided with a cover plate negative electrode mounting hole and a cover plate positive electrode mounting hole.

[0009] The insulating pad is provided with an insulating pad negative electrode mounting hole and an insulating pad positive electrode mounting hole at positions corresponding to the cover plate negative electrode mounting hole and the cover plate positive electrode mounting hole.

[0010] The upper part of the cover plate negative electrode mounting hole is provided with a negative electrode plastic pad.

[0011] The upper part of the cover plate positive electrode mounting hole is provided with a positive electrode plastic pad.

[0012] The lower part of the cover plate negative electrode mounting hole and the cover plate positive electrode mounting hole respectively embeds a negative electrode sealing ring and a positive electrode sealing ring from bottom to top.

[0013] The negative electrode plastic pad, the cover plate negative electrode mounting hole at the left end of the light aluminum plate, the negative electrode sealing ring and the insulating pad negative electrode mounting hole at the left end of the insulating pad are fixed together by a negative electrode pole rivet.

[0014] The positive electrode plastic pad, the cover plate positive electrode mounting hole at the right end of the light aluminum plate, the positive electrode sealing ring and the insulating pad positive electrode mounting hole at the right end of the insulating pad are fixed together by a positive electrode pole riveting;

[0015] The light aluminum plate is provided with a liquid injection hole;

[0016] The insulating pad is provided with a flow guide hole at a position corresponding to the liquid injection hole;

[0017] The flow guide hole is provided with a hollow flow guide plate;

[0018] The flow guide plate comprises an insulating plate body and a flow guide structure;

[0019] The insulating plate body is located above the flow guide structure;

[0020] The top of the insulating plate body is provided with an electrolyte inlet hole, and the upper part of the electrolyte inlet hole is directly communicated with the liquid injection hole;

[0021] The lower part of the insulating plate body and the flow guide structure are provided with an electrolyte outlet hole;

[0022] The lower part of the electrolyte inlet hole is communicated with the inside of the battery through the electrolyte outlet hole;

[0023] The flow guide structure of the flow guide plate comprises a bidirectional flow guide structure and a unidirectional flow guide structure;

[0024] When the flow guide structure of the flow guide plate adopts the bidirectional flow guide structure, the bidirectional flow guide structure specifically comprises a bidirectional flow guide protrusion protruding upward;

[0025] The bidirectional flow guide protrusion comprises two first flow guide blocks symmetrically distributed left and right;

[0026] The two first flow guide blocks are located directly below the liquid injection hole;

[0027] Between the lower part of the insulating plate body and the two first flow guide blocks, an electrolyte outlet hole is respectively arranged;

[0028] When the flow guide structure of the flow guide plate adopts the unidirectional flow guide structure, the unidirectional flow guide structure comprises a unidirectional flow guide block inclined downward;

[0029] One end of the unidirectional flow guide block is connected with the lower part of one end of the insulating plate body;

[0030] Between the other end of the unidirectional flow guide block and the lower part of the other end of the insulating plate body, an electrolyte outlet hole is arranged.

[0031] Preferably, the two first flow guide blocks are connected with each other, and the connection part of the two first flow guide blocks is a protruding part;

[0032] The center point of the protruding part is located on the same straight line as the center axis of the liquid injection hole;

[0033] The intersection angle of the two first flow guide blocks is obtuse.

[0034] Preferably, the intersection angle of the one-way flow guide block and the insulating plate body is acute.

[0035] Preferably, the liquid injection hole includes an upper liquid injection hole section and a lower liquid injection hole section distributed in an up-down manner;

[0036] The shape of the upper liquid injection hole section is inverted circular truncated cone shape;

[0037] The shape of the lower liquid injection hole section is cylindrical shape;

[0038] The bottom inner diameter of the upper liquid injection hole section is greater than the top inner diameter of the lower liquid injection hole section;

[0039] The bottom inner diameter of the lower liquid injection hole section is less than the top inner diameter of the electrolyte inlet hole in the insulating plate body of the flow guide plate.

[0040] Preferably, when the flow guide structure of the flow guide plate adopts one-way flow guide structure, the opening area of the electrolyte outlet hole is greater than the bottom opening area of the lower liquid injection hole section in the liquid injection hole on the light aluminum plate.

[0041] Preferably, the top opening diameter of the electrolyte inlet hole at the top of the flow guide plate is greater than the diameter of the top circular opening of the upper liquid injection hole section in the liquid injection hole.

[0042] Preferably, a gas vent is arranged at the transverse middle position of the light aluminum plate, and an explosion-proof valve protection film is welded on the upper part of the gas vent;

[0043] An explosion-proof valve is arranged at the bottom of the gas vent.

[0044] Correspondingly, the insulating pad is provided with a ventilation net at a position corresponding to the explosion-proof valve.

[0045] Preferably, the column body at the top of the negative pole post penetrates, from bottom to top, the insulating pad negative mounting hole at the left end of the insulating pad, the negative sealing ring, the cover plate negative mounting hole at the left end of the light aluminum plate, and the reserved through hole on the negative plastic pad, and is riveted with the top of the negative plastic pad.

[0046] Preferably, the column body at the top of the positive pole post penetrates, from bottom to top, the insulating pad positive mounting hole at the right end of the insulating pad, the positive sealing ring, the cover plate positive mounting hole at the right end of the light aluminum plate, and the reserved through hole on the positive plastic pad, and is riveted with the top of the positive plastic pad.

[0047] Preferably, the negative plastic pad and the positive plastic pad are insulating plastic gaskets.

[0048] From the above technical solutions provided by the present application, compared with the prior art, the present application provides a battery cover with liquid injection flow guide structure, which has a scientific structure design. On the one hand, a flow guide plate is arranged directly below the liquid injection hole (the flow guide plate is located on the insulating pad) for preventing the electrolyte from directly impacting the lower electrode group and causing problems such as electrode sheet powder falling and material shortage. On the other hand, considering that the electrolyte injection efficiency is affected after the flow guide plate is added, a new type of flow guide structure is specially designed on the flow guide plate to reduce the resistance of the flow guide plate to the electrolyte, thereby reducing the kinetic energy loss of the electrolyte. Therefore, when the electrolyte injection pressure is increased to improve the battery production efficiency, it is beneficial to ensure the electrolyte injection quality of the battery and avoid quality problems in battery production, which has great production practical significance. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 A perspective exploded view of the battery cover with liquid injection flow guide structure provided by the present application is shown in the figure.

[0050] Figure 2 A cross-sectional structure diagram of the battery cover with liquid injection flow guide structure provided by the present application is shown in the figure.

[0051] Figure 3 In the battery cover with liquid injection flow guide structure provided by the present application, the positional relationship between the liquid injection hole and the flow guide plate is shown in the figure.

[0052] Figure 4a In the battery cover with liquid injection flow guide structure provided by the present application, when the flow guide structure of the flow guide plate adopts a bidirectional flow guide structure, a perspective structure diagram when placed upside down is shown in the figure.

[0053] Figure 4b In the battery cover with liquid injection flow guide structure provided by the present application, when the flow guide structure of the flow guide plate adopts a bidirectional flow guide structure, an enlarged peripheral structure cross-sectional view is shown in the figure.

[0054] Figure 5a In the battery cover with liquid injection flow guide structure provided by the present application, when the flow guide structure of the flow guide plate adopts a unidirectional flow guide structure, a perspective structure diagram when placed upside down is shown in the figure.

[0055] Figure 5b In the battery cover with liquid injection flow guide structure provided by the present application, when the flow guide structure of the flow guide plate adopts a unidirectional flow guide structure, an enlarged peripheral structure cross-sectional view is shown in the figure. DETAILED DESCRIPTION

[0056] The technical solutions of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0057] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0058] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0059] The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0060] Referring to Figures 1 to 5b The present application provides a battery cover with liquid injection flow guide structure, comprising upper and lower distribution of aluminum plate 100 and insulating pad 200;

[0061] The left and right ends of the aluminum plate 100 are respectively provided with the cover plate negative electrode mounting hole 102 and the cover plate positive electrode mounting hole 101;

[0062] The insulating pad 200 is provided with insulating pad negative electrode mounting hole 202 and insulating pad positive electrode mounting hole 201 at the positions corresponding to the cover plate negative electrode mounting hole 102 and the cover plate positive electrode mounting hole 101;

[0063] The upper part of the cover plate negative electrode mounting hole 102 is provided with a negative electrode plastic pad 21;

[0064] The upper part of the cover plate positive electrode mounting hole 101 is provided with a positive electrode plastic pad 21;

[0065] The lower part of the cover plate negative electrode mounting hole 102 and the cover plate positive electrode mounting hole 101 are respectively embedded with a negative electrode sealing ring 22 and a positive electrode sealing ring 12 from bottom to top;

[0066] The negative electrode plastic pad 21, the cover plate negative electrode mounting hole 102 at the left end of the light aluminum plate 100, the negative electrode sealing ring 22 and the insulating pad negative electrode mounting hole 202 at the left end of the insulating pad 200 are riveted and fixed together through a negative electrode post 23;

[0067] The positive electrode plastic pad 21, the cover plate positive electrode mounting hole 101 at the right end of the light aluminum plate 100, the positive electrode sealing ring 22 and the insulating pad positive electrode mounting hole 201 at the right end of the insulating pad 200 are riveted and fixed together through a positive electrode post 13;

[0068] The light aluminum plate 100 is provided with a liquid injection hole 7;

[0069] The insulating pad 200 is provided with a flow guide hole 8 at a position corresponding to the liquid injection hole 7;

[0070] The flow guide hole 8 is provided with a hollow flow guide plate 9;

[0071] The flow guide plate 9 includes an insulating plate body 90 and a flow guide structure;

[0072] The insulating plate body 90 is located above the flow guide structure;

[0073] The top of the insulating plate body 90 is provided with an electrolyte inlet hole 91, and the upper part of the electrolyte inlet hole 91 directly communicates with the liquid injection hole 7 (without a barrier);

[0074] The lower part of the insulating plate body 90 and the flow guide structure are provided with an electrolyte outlet hole 92;

[0075] The lower part of the electrolyte inlet hole 91 communicates with the inside of the battery (specifically, the inside of the battery pole group, i.e., the object to be injected) through the electrolyte outlet hole 92.

[0076] In the present application, specifically, the liquid injection hole 7 includes an upper liquid injection hole section 71 and a lower liquid injection hole section 72 distributed upward and downward;

[0077] The shape of the upper liquid injection hole section 71 is an inverted circular truncated cone shape;

[0078] The shape of the lower liquid injection hole section 72 is a cylindrical shape;

[0079] The inner diameter of the bottom of the upper liquid injection hole section 71 is greater than the inner diameter of the top of the lower liquid injection hole section 72;

[0080] The bottom inner diameter of the liquid injection hole section 72 is smaller than the top inner diameter of the electrolyte inlet hole 91 in the insulating plate body 90 of the flow guide plate 9.

[0081] In the present application, the flow guide structure of the flow guide plate 9 includes bidirectional flow guide structure and unidirectional flow guide structure.

[0082] In the present application, the flow guide structure of the flow guide plate 9 includes bidirectional flow guide structure and unidirectional flow guide structure. Figure 4a and Figure 4b When the flow guide structure of the flow guide plate 9 adopts bidirectional flow guide structure (i.e., as a bidirectional flow guide plate), the bidirectional flow guide structure specifically includes a bidirectional flow guide bump protruding upward;

[0083] The bidirectional flow guide bump includes two first flow guide blocks 93 symmetrically distributed left and right;

[0084] The two first flow guide blocks 93 are located directly below the liquid injection hole 7;

[0085] Between the lower part of the insulating plate body 90 and the two first flow guide blocks 93, one electrolyte outlet hole 92 is respectively arranged (i.e., there are two electrolyte outlet holes 92 in total).

[0086] Specifically, the two first flow guide blocks 93 are connected to each other, and the connection part of the two first flow guide blocks 93 is a protruding part;

[0087] The center point of the protruding part is located on the same straight line as the center axis of the liquid injection hole 7.

[0088] Specifically, the intersection angle between the two first flow guide blocks 93 is an obtuse angle (e.g., 120 degrees).

[0089] It should be noted that when the flow guide structure of the flow guide plate 9 adopts bidirectional flow guide structure (i.e., as a bidirectional flow guide plate), the main structure of the flow guide plate is that two first flow guide blocks 93 (i.e., bidirectional flow guide bump) symmetrically distributed left and right and at a certain angle are arranged on the insulating pad directly below the liquid injection hole, and there are two electrolyte outlet holes. When the electrolyte impacts, the two first flow guide blocks of the flow guide plate play a role in guiding the electrolyte, reducing the energy loss of the electrolyte. At the same time, the insulating plate body 90 of this structure includes two symmetrically distributed insulating blocks 901, and the distance between the two insulating blocks 901 is greater than the width of the bidirectional flow guide bump (including the two first flow guide blocks 93), preventing the mold from having a side core pulling mechanism and increasing the cost of the mold.

[0090] In the present application, the flow guide structure of the flow guide plate 9 includes bidirectional flow guide structure and unidirectional flow guide structure. Figure 5a and Figure 5b When the flow guide structure of the flow guide plate 9 adopts unidirectional flow guide structure (i.e., as a unidirectional flow guide plate), the unidirectional flow guide structure includes a unidirectional flow guide block 94 inclined downward;

[0091] One end of the one-way flow guide block 94 is connected to the lower part of one end of the insulating plate body 90.

[0092] The other end of the one-way flow guide block 94 is connected to the lower part of the other end of the insulating plate body 90.

[0093] Specifically, the intersection angle between the one-way flow guide block 94 and the insulating plate body 90 is an acute angle (for example, 45 degrees).

[0094] It should be noted that when the flow guide structure of the flow guide plate 9 adopts a one-way flow guide structure (i.e., as a one-way flow guide plate), a one-way flow guide block 94 is arranged directly below the injection hole, and the one-way flow guide block 94 has a certain slope. The structure has only one electrolyte outlet hole 92 on the insulating pad, and the opening area of the electrolyte outlet hole 92 is larger than the bottom opening area of the lower injection hole section 72 in the injection hole 7 on the aluminum plate 100.

[0095] Compared with the two-way flow guide plate, the one-way flow guide plate has the advantages of being able to control the direction of the electrolyte outflow in the battery, greatly reducing the impact of the electrolyte on the relatively fragile components inside the battery (for example, the positive and negative materials on the pole piece may be impacted and fall off, thereby changing the tight state of the positive and negative electrodes and the separator to a scattered state), and the disadvantage is that the energy loss of the electrolyte is greater than that of the two-way flow guide plate.

[0096] In the present application, it should be noted that the aluminum plate is a common flat plate type battery cover plate.

[0097] In the present application, specifically, a gas vent 3 is arranged at the transverse middle position of the aluminum plate 100, and a burst valve protection film 4 is arranged at the upper part of the gas vent 3.

[0098] The bottom of the gas vent 3 is provided with a burst valve 5.

[0099] Correspondingly, the insulating pad is provided with a ventilation net 6 at a position corresponding to the burst valve 5 (i.e., a position directly below the burst valve 5).

[0100] It should be noted that for the present application, by arranging the burst valve 5, when the internal pressure of the battery installed on the battery cover plate exceeds the pressure that the burst valve 5 can withstand, the gas inside the battery can be discharged in time, ultimately playing a role in reducing the pressure, so that the internal pressure of the battery remains in a relatively stable state, thereby ensuring the safety of the battery in use.

[0101] In the present application, the column body at the top of the negative pole post 23 (functionally equivalent to the shank of a rivet) penetrates, from bottom to top, the negative installation hole 202 of the left end of the insulating pad 200, the negative sealing ring 22, the negative installation hole 102 of the left end of the cover plate of the aluminum plate 100, and the through hole reserved on the negative plastic pad 21, and is riveted together with the top of the negative plastic pad 21.

[0102] The column body at the top of the positive pole post 13 (functionally equivalent to the shank of a rivet) penetrates, from bottom to top, the positive installation hole 201 of the right end of the insulating pad 200, the positive sealing ring 12, the positive installation hole 101 of the right end of the cover plate of the aluminum plate 100, and the through hole reserved on the positive plastic pad 11, and is riveted together with the top of the positive plastic pad 11.

[0103] In the present application, the negative plastic pad 21 and the positive plastic pad 11 are preferably insulating plastic (insulating polyphenylene sulfide PPS plastic) gaskets.

[0104] It should be noted that when battery manufacturers increase the injection pressure in order to speed up the injection efficiency of the electrolyte, the impact force of the electrolyte on the battery pole group also increases. In order to avoid the problem of pole piece powder falling and material shortage caused by the impact of the electrolyte on the pole group, a flow guide plate is provided directly below the injection hole of the electrolyte (the flow guide plate is located on the insulating pad), thereby preventing the electrolyte from directly impacting the pole group below and causing the problem of pole piece powder falling and material shortage. On the other hand, considering that the injection efficiency of the electrolyte is affected after the flow guide plate is added, a new type of flow guide structure is specially designed on the flow guide plate, which can reduce the resistance of the flow guide plate to the electrolyte, thereby reducing the kinetic energy loss of the electrolyte.

[0105] It should be noted that the battery cover of the present application is assembled according to the corresponding structure in Figure 1 , Figure 2 After assembly, the assembly is placed in an injection mold for injection molding, and the production of the battery cover is completed.

[0106] For the present application, the electrolyte flow guide structure (i.e. the flow guide plate) is on the insulating pad 200 (specifically the insulating rubber pad), and the flow guide plate is directly below the injection hole of the electrolyte. The overall width of the flow guide plate is greater than the diameter of the injection hole 7 (specifically, the top opening diameter of the electrolyte inlet hole 91 at the top of the flow guide plate 9 is greater than the diameter of the top circular opening of the upper injection hole section 71 in the injection hole 7), so that the flow guide plate (also as a flow barrier) cannot completely block the electrolyte, thereby preventing the electrolyte from directly impacting the pole group below during injection.

[0107] For the present application, the vertical distance between the injection hole and the flow guide structure (one-way flow guide structure or two-way flow guide structure) in the flow guide plate is set as large as possible without hindering assembly and insulation, so as to reduce the kinetic energy loss of the electrolyte caused by the flow guide plate. The main functions of the structure of the flow guide plate include: first, preventing the tab of the battery pole group below the light aluminum plate from contacting the light aluminum plate (i.e. the battery cover plate) to cause short circuit problem, and second, guiding the electrolyte during injection.

[0108] In summary, compared with the prior art, the battery cover with injection flow guide structure provided by the present application has a scientific structure design. On the one hand, a flow guide plate is arranged directly below the injection hole for injecting electrolyte (the flow guide plate is located on the insulating pad), thereby preventing the electrolyte from directly impacting the pole group below to cause problems such as tab powder falling and material shortage. On the other hand, considering that the injection efficiency of the electrolyte is affected after the flow guide plate is added, a new type of flow guide structure is specially designed on the flow guide plate, which can reduce the resistance of the flow guide plate to the electrolyte, thereby reducing the kinetic energy loss of the electrolyte. Therefore, when the injection pressure of the electrolyte is increased to improve the production efficiency of the battery, it is beneficial to guarantee the injection quality of the battery and avoid quality problems in battery production, which has great production practical significance.

[0109] The above description is only the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A battery cover with a liquid injection guide structure, characterized by, It includes light aluminum plate (100) and insulation pad (200) distributed up and down; The left and right ends of the light aluminum plate (100) are respectively provided with the cover plate negative pole mounting hole (102) and the cover plate positive pole mounting hole (101); The insulation pad (200) is respectively provided with the insulation pad negative pole mounting hole (202) and the insulation pad positive pole mounting hole (201) at the positions corresponding to the cover plate negative pole mounting hole (102) and the cover plate positive pole mounting hole (101); The upper part of the cover plate negative pole mounting hole (102) is provided with the negative pole plastic pad (21); The upper part of the cover plate positive pole mounting hole (101) is provided with the positive pole plastic pad (11); The lower parts of the cover plate negative pole mounting hole (102) and the cover plate positive pole mounting hole (101) are respectively embedded with a negative pole sealing ring (22) and a positive pole sealing ring (12) from bottom to top; The negative pole plastic pad (21), the cover plate negative pole mounting hole (102) at the left end of the light aluminum plate (100), the negative pole sealing ring (22) and the insulation pad negative pole mounting hole (202) at the left end of the insulation pad (200) are riveted and fixed together through a negative pole pole (23); The positive pole plastic pad (11), the cover plate positive pole mounting hole (101) at the right end of the light aluminum plate (100), the positive pole sealing ring (12) and the insulation pad positive pole mounting hole (201) at the right end of the insulation pad (200) are riveted and fixed together through a positive pole pole (13); The light aluminum plate (100) is provided with a liquid injection hole (7); The insulation pad (200) is provided with a flow guide hole (8) at the position corresponding to the liquid injection hole (7); A hollow flow guide plate (9) is arranged on the flow guide hole (8); The flow guide plate (9) comprises an insulation plate body (90) and a flow guide structure; The insulation plate body (90) is located above the flow guide structure; The top of the insulation plate body (90) is provided with an electrolyte inlet hole (91), and the upper part of the electrolyte inlet hole (91) is directly communicated with the liquid injection hole (7); An electrolyte outlet hole (92) is arranged between the lower part of the insulation plate body (90) and the flow guide structure; The lower part of the electrolyte inlet hole (91) is communicated with the inside of the battery through the electrolyte outlet hole (92); The flow guide structure of the flow guide plate (9) comprises bidirectional flow guide structure and unidirectional flow guide structure; When the flow guide structure of the flow guide plate (9) adopts bidirectional flow guide structure, the bidirectional flow guide structure comprises upward protruding bidirectional flow guide lugs; The bidirectional flow guide lugs comprise two first flow guide blocks (93) symmetrically distributed left and right; The two first flow guide blocks (93) are located directly below the liquid injection hole (7); An electrolyte outlet hole (92) is arranged between the lower part of the insulation plate body (90) and the two first flow guide blocks (93); When the flow guide structure of the flow guide plate (9) adopts unidirectional flow guide structure, the unidirectional flow guide structure comprises downward inclined unidirectional flow guide blocks (94); One end of the unidirectional flow guide block (94) is connected with the lower part of one end of the insulation plate body (90); An electrolyte outlet hole (92) is arranged between the other end of the unidirectional flow guide block (94) and the lower part of the other end of the insulation plate body (90). Two first flow guide blocks (93) are connected to each other, and the connection part of the two is a protruding part; The center point of the protruding part is on the same straight line as the center axis of the liquid injection hole (7); The intersection angle between the two first flow guide blocks (93) is an obtuse angle; The intersection angle between the one-way flow guide block (94) and the insulating plate body (90) is an acute angle.

2. The battery cover with liquid injection flow guide structure according to claim 1, wherein, The liquid injection hole (7) includes an upper liquid injection hole section (71) and a lower liquid injection hole section (72) distributed vertically; The shape of the upper liquid injection hole section (71) is an inverted circular truncated cone shape; The shape of the lower liquid injection hole section (72) is a cylindrical shape; The inner diameter of the bottom of the upper liquid injection hole section (71) is greater than the inner diameter of the top of the lower liquid injection hole section (72); The inner diameter of the bottom of the lower liquid injection hole section (72) is less than the inner diameter of the top of the electrolyte inlet hole (91) in the insulating plate body (90) of the flow guide plate (9).

3. The battery cover with liquid injection flow guide structure according to claim 1, wherein, When the flow guide structure of the flow guide plate (9) adopts a one-way flow guide structure, the opening area of the electrolyte outlet hole (92) is greater than the bottom opening area of the lower liquid injection hole section (72) in the liquid injection hole (7) on the light aluminum plate (100).

4. The battery cover with liquid injection flow guide structure according to claim 1, wherein, The top opening diameter of the electrolyte inlet hole (91) at the top of the flow guide plate (9) is greater than the diameter of the top circular opening of the upper liquid injection hole section (71) in the liquid injection hole (7).

5. The battery cover with liquid injection flow guide structure according to claim 1, wherein, A gas vent (3) is arranged at the transverse middle position of the light aluminum plate (100), and an explosion-proof valve protection film (4) is welded on the upper part of the gas vent (3); An explosion-proof valve (5) is arranged at the bottom of the gas vent (3); Correspondingly, the insulating pad is provided with a ventilation net (6) at a position corresponding to the explosion-proof valve (5).

6. The battery cover with liquid injection flow guide structure according to claim 1, wherein, The column at the top of the negative pole post (23) penetrates the insulating pad negative pole mounting hole (202) at the left end of the insulating pad (200), the negative pole sealing ring (22), the cover plate negative pole mounting hole (102) at the left end of the light aluminum plate (100), and the through hole reserved on the negative pole plastic pad (21) in sequence from bottom to top, and is riveted with the top of the negative pole plastic pad (21).

7. The battery cover with liquid injection flow guide structure according to claim 1, wherein, The column at the top of the positive pole post (13) penetrates the insulating pad positive pole mounting hole (201) at the right end of the insulating pad (200), the positive pole sealing ring (12), the cover plate positive pole mounting hole (101) at the right end of the light aluminum plate (100), and the through hole reserved on the positive pole plastic pad (11) in sequence from bottom to top, and is riveted with the top of the positive pole plastic pad (11).

8. The battery cover with liquid injection guiding structure according to any one of claims 1 to 7, wherein, The negative pole plastic pad (21) and the positive pole plastic pad (11) are insulating plastic gaskets.

Images