Injection mold

Abstract

The embodiment of the utility model relates to the technical field of molds, and particularly discloses an injection mold which comprises a first mold plate, a second mold plate and a third mold plate. The second mold plate is movably arranged on the opening of the mold cavity in a covering manner; the single battery is arranged in the cavity, the single battery comprises a battery body and a battery protection plate, the battery body extends along the first direction, and the battery protection plate is arranged on one side of the battery body in the first direction; the expansion part is arranged on one side, close to the battery protection plate of the single battery, of the second template, an expansion cavity is formed in the expansion part, and the expansion cavity is communicated with an external air source part; under the action of the air source part, the expansion part is deformed, so that the expansion part is propped against the part, close to the battery protection plate, of the battery body. According to the injection mold, the problem of serious glue overflow after the single battery is packaged is effectively solved, the glue overflow prevention effect of the injection mold is improved, the production scrap of the single battery is reduced, and finally the production efficiency of the single battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of molds, and particularly relates to an injection mold. Background Art

[0002] With the development of soft-pack secondary batteries towards simplicity and low cost, the requirements for the encapsulation of secondary batteries are getting higher and higher. For the encapsulation at the position of the battery protection board of soft-pack secondary batteries, there are two methods: encapsulation with adhesive tape or encapsulation with injection molding. Compared with the traditional encapsulation with adhesive tape, the injection molding encapsulation has the advantages of one-time molding, high efficiency and low cost, and has certain structural strength, heat dissipation performance and waterproof performance.

[0003] The existing processing tolerance of soft-pack secondary batteries themselves is about 1 mm. When using aluminum-plastic film for encapsulation, they are prone to being deformed under pressure. When the existing injection mold is used to encapsulate soft-pack secondary batteries by injection molding, it is difficult to ensure that the injection molding encapsulation part of the soft-pack secondary battery is completely sealed under the premise of ensuring that the soft-pack secondary battery does not deform, resulting in serious glue overflow after the battery is encapsulated. Therefore, how to improve the anti-glue-overflow effect of the injection mold has become an urgent problem to be solved. Summary of the Utility Model

[0004] Embodiments of the present application provide an injection mold to solve the problem of glue overflow in the encapsulation of single cells.

[0005] To solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0006] On the one hand, an injection mold is provided, having a first direction, including: a first template, provided with a cavity having an open end;

[0007] a second template, movably covering the open end of the cavity;

[0008] a single cell, disposed in the cavity, and the single cell includes: a battery body and a battery protection board, the battery body extends along the first direction, and the battery protection board is disposed on one side of the battery body in the first direction; and

[0009] an expansion member, disposed on the side of the second template close to the battery protection board of the single cell, an expansion cavity is provided in the expansion member, and the expansion cavity is communicated with an external air source member;

[0010] Under the action of the air source member, the expansion member deforms so that the expansion member abuts against the part of the battery body close to the battery protection board.

[0011] In addition to one or more of the above-disclosed features, or as an alternative, the expansion member includes: a connected fixing part and an expansion part;

[0012] The fixing part is arranged on the second template, the expanding part is arranged on the side of the fixing part close to the open end of the cavity, the fixing part and the expanding part cooperate to enclose an expansion cavity, a communication hole is formed in the fixing part, and the gas source part is communicated with the expansion cavity through the communication hole;

[0013] Under the action of the gas source part, the expanding part deforms so that the expanding part abuts against the part of the battery body close to the battery protection board.

[0014] In addition to one or more of the above-disclosed features, or as an alternative, the expanding part further includes: a separating part, which is arranged in the expansion cavity to divide the expansion cavity into a first sub-cavity and a second sub-cavity. The first sub-cavity is arranged closer to the cavity than the second sub-cavity, and the gas source part is communicated with the second sub-cavity through the communication hole;

[0015] The gas source part controls the pressure difference between the first sub-cavity and the second sub-cavity so that the first sub-cavity expands, thereby making the expanding part abut against the part of the battery body close to the battery protection board.

[0016] In addition to one or more of the above-disclosed features, or as an alternative, the injection mold further has a second direction intersecting the first direction;

[0017] The maximum dimension of the expanding part in the second direction is L 1 mm, and the maximum dimension of the single battery in the second direction is L 2 mm, satisfying: L 1 ≥L 2 .

[0018] In addition to one or more of the above-disclosed features, or as an alternative, the wall thickness of the expanding part is H 1 mm, satisfying: 1≤H 1 ≤2.

[0019] In addition to one or more of the above-disclosed features, or as an alternative, the injection mold further has a second direction intersecting the first direction;

[0020] The expanding part further includes: a plurality of flow-blocking parts, which are all convexly arranged on the side of the expanding part close to the open end of the cavity, and the plurality of flow-blocking parts all extend along the first direction or the second direction, and adjacent two flow-blocking parts are arranged at intervals to form a flow-blocking groove between adjacent two flow-blocking parts.

[0021] In addition to one or more of the above-disclosed features, or as an alternative, it further includes: a first pressure sensor, a first connecting pipe and a second connecting pipe;

[0022] The first pressure sensor is communicated with the output end of the gas source part through the first connecting pipe and with the communication hole through the second connecting pipe, and the first pressure sensor is configured to monitor the air pressure in the expansion cavity.

[0023] In addition to, or as an alternative to, one or more of the features disclosed above, it further includes: a second pressure sensor disposed on the first template or the second template, and the second pressure sensor is located inside the cavity. The second pressure sensor is configured to monitor the injection pressure inside the cavity.

[0024] In addition to, or as an alternative to, one or more of the features disclosed above, on one side of the first template close to the expansion member, a glue inlet channel is provided, and a glue inlet is provided on the second template. The glue inlet channel is respectively communicated with the glue inlet and the cavity.

[0025] In addition to, or as an alternative to, one or more of the features disclosed above, on one side of the first template close to the second template, a positioning portion is provided, and a positioning hole is provided on the second template. The positioning hole is adapted to the positioning portion;

[0026] The positioning portion is embedded in the positioning hole to position and fix the first template and the second template.

[0027] One of the above technical solutions has the following advantages or beneficial effects: In this application, by providing an expansion member, the deformation of the expansion member is utilized to make the expansion member abut against the part of the battery body close to the battery protection board, so as to seal the part of the single battery close to the battery protection board, thereby preventing the glue from flowing to other parts of the single battery, enabling the glue to preferably form an injection structure, effectively solving the problem of serious glue overflow in the encapsulation of the single battery, improving the anti-glue-overflow effect of the injection mold, and ensuring the injection encapsulation effect of the single battery. Description of the Drawings

[0028] The following, in conjunction with the drawings, through a detailed description of the specific embodiments of the present application, will make the technical solutions and other beneficial effects of the present application obvious.

[0029] Figure 1 is a three-dimensional structural view of the injection mold in the closed mold state according to an embodiment of the present application;

[0030] Figure 2 is a three-dimensional structural view of the injection mold in the open mold state according to an embodiment of the present application;

[0031] Figure 3 is an exploded structural view of the injection mold according to an embodiment of the present application;

[0032] Figure 4 is a top view of the injection mold according to an embodiment of the present application;

[0033] Figure 5 is a cross-sectional view of the injection mold along the A-A direction according to an embodiment of the present application;

[0034] Figure 6It is a cross-sectional view of an injection mold along the A-A direction provided by another embodiment of the present application;

[0035] Figure 7 It is a schematic structural diagram of an expansion member provided by an embodiment of the present application;

[0036] Figure 8 It is a schematic structural diagram of the expansion member from another perspective provided by an embodiment of the present application;

[0037] Figure 9 is Figure 8 The partial enlarged view at position B in

[0038] Description of reference numerals:

[0039] 100, injection mold;

[0040] 110, first template; 111, cavity; 112, glue inlet runner; 113, positioning portion;

[0041] 120, second template; 121, glue inlet; 122, positioning hole;

[0042] 130, expansion member; 131, fixing portion; 1311, communication hole; 132, expansion portion; 1321, expansion cavity; 13211, first sub-cavity; 13212, second sub-cavity; 133, flow blocking portion; 134, flow blocking groove; 135, partitioning portion;

[0043] 140, first pressure sensor;

[0044] 150, first connecting pipe;

[0045] 160, second connecting pipe;

[0046] 200, single cell; 210, battery body; 220, battery protection board. Detailed implementation manners

[0047] In order to make the objectives, technical solutions and beneficial effects of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be understood that the specific implementation manners described in this specification are only for explaining the present application and not for limiting the present application.

[0048] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. These terms are only used for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0049] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0050] In the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0051] When the existing injection mold injects glue for encapsulating a soft-pack secondary battery, it is difficult to ensure that the glue injection and encapsulation part of the soft-pack secondary battery is completely sealed on the premise of ensuring that the soft-pack secondary battery does not deform. During glue injection, the glue will enter the gap between the cavity and the side wall of the lithium-ion battery, resulting in the glue entering the side wall of the lithium-ion battery and overflowing the entire side wall of the lithium-ion battery, causing serious glue overflow after the lithium-ion battery is encapsulated.

[0052] In view of this, in the embodiments of the present application, please refer to Figures 1 to 9, the present application provides an injection mold 100, which is used for injecting and encapsulating the glue at the position of the battery protection board of the single battery. The injection mold 100 has a first direction Y, a second direction X, and a third direction Z that intersect pairwise. Exemplarily, the injection mold 100 has a first direction Y, a second direction X, and a third direction Z that are perpendicular to each other pairwise. Exemplarily, in the present application, the first direction Y is the length direction of the injection mold 100, the second direction X is the width direction of the injection mold 100, and the third direction Z is the height direction of the injection mold 100.

[0053] Wherein, "perpendicular" refers to the state where the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°.

[0054] Specifically, the injection mold 100 includes: a first template 110, a second template 120, an expansion member 130, and a single battery 200.

[0055] The first template 110 is provided with a cavity 111 having an opening, and the cavity 111 is used for accommodating the single battery 200 to be injection-molded and encapsulated; the second template 120 is movably covered on the opening of the cavity 111, that is, the second template 120 can be separated from the first template 110, and the second template 120 can also be in contact connection with the first template 110 and cover the opening of the cavity 111; the single battery 200 is disposed in the cavity 111, and the single battery 200 includes: a battery body 210 and a battery protection board 220, the battery body 210 extends along the first direction Y, and the battery protection board 220 is disposed on one side of the battery body 210 in the first direction Y, and the battery protection board 220 is electrically connected to the battery body 210; the expansion member 130 is disposed on the side of the second template 120 close to the battery protection board 220 of the single battery 200, and an expansion cavity 1321 is provided in the expansion member 130, and the expansion cavity 1321 is communicated with an external gas source member (not shown in the figure), and the gas source member is used for delivering gas to the expansion cavity 1321 or extracting the gas in the expansion cavity 1321. Under the action of the gas source member, the expansion member 130 deforms so that the expansion member 130 abuts against the part of the battery body 210 close to the battery protection board 220.

[0056] Wherein, the single battery 200 can be a secondary battery, and a secondary battery refers to a battery that can activate the active material and continue to be used by charging after the battery discharges. Exemplarily, the single battery 200 can be a soft-pack lithium-ion battery and is applied to portable electronic devices such as smart phones and tablet computers, but is not limited thereto.

[0057] The single battery 200 can also be flat, rectangular or other shapes, etc.

[0058] Among them, the expansion member 130 is made of a flexible material. Exemplarily, the expansion member 130 can be made of rubber or silica gel, but is not limited thereto.

[0059] Among them, when the injection mold 100 is closed and the expansion member 130 is in an undeformed state, at this time, the expansion member 130 can be in contact connection with the part of the battery body 210 close to the battery protection board 220, or can be spaced apart from the part of the battery body 210 close to the battery protection board 220. In this application, no specific limitation is made, and it can be specifically set according to the actual situation. Exemplarily, in this application, when the injection mold 100 is closed and the expansion member 130 is in an unexpanded state, the expansion member 130 can be in contact connection with the part of the battery body 210 close to the battery protection board 220 to initially seal the part of the battery body 210 close to the battery protection board 220.

[0060] It can be understood that the injection mold 100 has two states: open mold and closed mold. When the injection mold 100 is in the open mold state, the first template 110 and the second template 120 are in a separated state, and the staff can place the monomer battery 200 to be injected with glue into the cavity 111, or take out the monomer battery 200 that has been injected with glue from the cavity 111.

[0061] When the injection mold 100 is in the closed mold state, the first template 110 and the second template 120 are in contact connection to seal the cavity 111. At the same time, the first template 110 and the second template 120 limit and fix the monomer battery 200 located in the cavity 111, and the expansion member 130 is in contact connection with the part of the battery body 210 close to the battery protection board 220 to initially seal the part of the battery body 210 close to the battery protection board 220. At the same time, the gas source member conveys gas to the expansion cavity 1321 or extracts the gas in the expansion cavity 1321, so that the expansion member 130 deforms, and then the expansion member 130 abuts against the part of the battery body 210 close to the battery protection board 220 to further seal the part of the battery body 210 close to the battery protection board 220. At this time, glue can be injected into the cavity 111 to encapsulate the part of the battery body 210 close to the battery protection board 220. At the same time, because the expansion member 130 abuts against the part of the battery body 210 close to the battery protection board 220, it can prevent the glue from flowing to other parts of the monomer battery 200, so that the glue can better form an injection structure, effectively solving the problem of serious glue overflow in the injection encapsulation of the monomer battery 200 and ensuring the injection encapsulation effect of the monomer battery 200.

[0062] In one embodiment, please refer to Figures 3 to 5 , the expansion member 130 includes: a connected fixing part 131 and an expansion part 132.

[0063] The fixing part 131 is arranged on the second template 120. Exemplarily, in this application, the fixing part 131 is detachably connected to the second template 120 by bolts; the expansion part 132 is arranged on one side of the fixing part 131 close to the open end of the cavity 111, that is, the expansion part 132 is arranged relatively closer to the cavity 111 than the fixing part 131, so as to facilitate the abutting and sealing of the expansion part 132 with the single cell 200. The fixing part 131 and the expansion part 132 cooperate to enclose an expansion cavity 1321. A communication hole 1311 is formed in the fixing part 131, and the gas source part is communicated with the expansion cavity 1321 through the communication hole 1311. Under the action of the gas source part, the expansion part 132 deforms, so that the expansion part 132 abuts against the part of the battery body 210 close to the battery protection board 220.

[0064] Among them, the fixing part 131 can be integrally formed with the expansion part 132, that is, the fixing part 131 and the expansion part 132 are of an integral structure. Exemplarily, the fixing part 131 and the expansion part 132 are integrally injection-molded. The fixing part 131 can also be separately arranged from the expansion part 132, and the two are fixedly connected. Exemplarily, the fixing part 131 is fixedly connected to the expansion part 132 by processes such as riveting or clamping. In this application, no specific limitation is made, and it can be specifically set according to the actual situation.

[0065] Among them, in this embodiment, the gas source part is an inflation element. Exemplarily, the gas source part can be any one of a manual air pump, an electric air pump, and a pneumatic machine, but is not limited thereto.

[0066] It can be understood that when the injection mold 100 is in the closed mold state and the single cell 200 is to be injection-molded and encapsulated, the gas source part conveys gas to the expansion cavity 1321, so that the air pressure in the expansion cavity 1321 increases, so that the expansion part 130 deforms, the expansion part 132 inflates and expands, and further the expansion part 132 abuts against the part of the battery body 210 close to the battery protection board 220, so as to seal the part of the battery body 210 close to the battery protection board 220. At this time, glue can be injected into the cavity 111 to encapsulate the part of the battery body 210 close to the battery protection board 220. At the same time, since the expansion part 132 abuts against the part of the battery body 210 close to the battery protection board 220, it can prevent the glue from flowing to other parts of the single cell 200, so that the glue can better form an injection-molded structure, effectively solving the problem of serious glue overflow in the injection molding and encapsulation of the single cell 200, and ensuring the injection molding and encapsulation effect of the single cell 200.

[0067] In another embodiment, please refer to Figure 6, the expansion member 130 further includes: a partition portion 135 disposed in the expansion cavity 1321 to divide the expansion cavity 1321 into a first sub-cavity 13211 and a second sub-cavity 13212. The first sub-cavity 13211 is relatively closer to the cavity 111 than the second sub-cavity 13212, that is, the expansion portion 132 enclosing the first sub-cavity 13211 is closer to the cavity 111 than the expansion portion 132 enclosing the second sub-cavity 13212, so that the expansion portion 132 enclosing the first sub-cavity 13211 abuts against the part of the battery body 210 close to the battery protection plate 220, thereby sealing the part of the battery body 210 close to the battery protection plate 220. The gas source member is communicated with the second sub-cavity 13212 through the communication hole 1311, and the first sub-cavity 13211 is integrally sealed. The gas source member controls the pressure difference between the first sub-cavity 13211 and the second sub-cavity 13212 to cause the first sub-cavity 13211 to expand, so that the expansion portion 132 abuts against the part of the battery body 210 close to the battery protection plate 220.

[0068] Among them, the partition portion 135 can be integrally formed with the fixing portion 131 and the expansion portion 132, that is, the partition portion 135, the fixing portion 131 and the expansion portion 132 are of an integral structure. Exemplarily, the partition portion 135, the fixing portion 131 and the expansion portion 132 are integrally injection-molded. The fixing portion 131 can also be separately provided from the fixing portion 131 and the expansion portion 132, and the three are fixedly connected. Exemplarily, the partition portion 135 is fixedly connected to the fixing portion 131 and the expansion portion 132 respectively by processes such as riveting or clamping. In this application, no specific limitation is made, and it can be specifically set according to the actual situation.

[0069] Among them, in this embodiment, the gas source member is a vacuum pumping element. Exemplarily, the gas source member can be any one of a mechanical pump, a diffusion pump, a molecular pump, and a centrifugal pump, but is not limited thereto.

[0070] It can be understood that when the injection mold 100 is in the mold-closed state and the single battery 200 is to be injection-molded and encapsulated, the air source component extracts the gas in the second sub-chamber 13212, so that the second sub-chamber 13212 forms a negative pressure space, thereby causing a pressure difference between the first sub-chamber 13211 and the second sub-chamber 13212, and the air pressure in the first sub-chamber 13211 is greater than that in the second sub-chamber 13212, so that the expansion part 132 surrounding and forming the first sub-chamber 13211 expands, and further causes the expansion part 132 to abut against the part of the battery body 210 close to the battery protection plate 220, so as to seal the part of the battery body 210 close to the battery protection plate 220. At this time, glue can be injected into the cavity 111 to encapsulate the part of the battery body 210 close to the battery protection plate 220. At the same time, because the expansion part 132 abuts against the part of the battery body 210 close to the battery protection plate 220, it can prevent the glue from flowing to other parts of the single battery 200, so that the glue can better form an injection structure, effectively solving the problem of serious glue overflow in the encapsulation of the single battery 200 and ensuring the injection-molding encapsulation effect of the single battery 200.

[0071] In one embodiment, please refer to Figure 5 , the maximum dimension of the expansion part 132 in the second direction X is L 1 mm, and the maximum dimension of the single battery 200 in the second direction X is L 2 mm, satisfying: L 1 ≥L 2 . That is, the maximum dimension L 1 mm of the expansion part 132 in the second direction X is not less than the maximum dimension L 2 mm of the single battery 200 in the second direction X, so as to ensure that the expansion part 132 can completely abut against the part of the battery body 210 close to the battery protection plate 220, so as to completely seal the part of the single battery 200 close to the battery protection plate 220, further preventing the glue from flowing to other parts of the single battery 200, so that the glue can better form an injection structure, effectively solving the problem of serious glue overflow in the encapsulation of the single battery 200 and improving the glue-overflow prevention effect of the injection mold 100.

[0072] Among them, the maximum dimension L 1 mm of the expansion part 132 in the second direction X can be obtained by disassembling the actual injection mold 100 and measuring the distance between the two farthest end faces of the expansion part 132 of the expansion part 130 in the second direction X with a measuring tool multiple times and calculating the average value. The measuring tool can be any one of a straight ruler, a vernier caliper or other dimension measuring instruments, but is not limited thereto.

[0073] The maximum dimension L 2The mm can be obtained by using a measuring tool to measure the distance between the two end faces of the actual single cell 200 that are farthest apart in the second direction X multiple times respectively and calculating the average value. The measuring tool can be any one of a ruler, a vernier caliper or other dimensional measuring instruments, but is not limited thereto.

[0074] In one embodiment, the wall thickness dimension of the expansion part 132 can be uniform or non-uniform. Generally, the wall thicknesses of the expansion parts 132 at different positions are consistent, and even if they are not, there are only small thickness differences due to processing.

[0075] Specifically, please refer to Figure 5 , the wall thickness of the expansion part 132 is H 1 mm, satisfying: 1 ≤ H 1 ≤ 2. Exemplarily, when the wall thickness dimension of the expansion part 132 is uniform, the wall thickness H 1 mm of the expansion part 132 can be one of 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2 mm. When the wall thickness dimension of the expansion part 132 is not uniform, then the wall thickness H 1 mm of the expansion part 132 can be 1 - 1.3 mm, 1.2 - 1.6 mm, 1.5 - 1.8 mm or 1.8 - 2 mm. It should be noted that the specific value of the wall thickness H 1 mm is only given exemplarily. As long as the wall thickness H 1 mm is any value within the range of 1 - 2 mm, it is within the protection scope of this application.

[0076] In this application, by controlling the wall thickness H 1 mm of the expansion part 132 within the range of 1 - 2 mm, the wall thickness dimension of the expansion part 132 is made appropriate and prone to deformation, so that after the expansion part 132 expands, it can adapt to the irregular corners of the single cell 200 and its own processing tolerances, improve the sealing effect of the expansion part 132, and further improve the anti-bleeding glue effect of the injection mold fixture and the production efficiency of the single cell 200.

[0077] Among them, the wall thickness H 1 mm of the expansion part 132 can be obtained by disassembling the actual injection mold 100, using a cutting device to cut the expansion part 130 of the expansion part to obtain a measurement sample at the expansion part 132 of the expansion part 130, and using a measuring tool to measure the wall thicknesses at different positions of the measurement sample at the expansion part 132 multiple times respectively and calculating the average value. The measuring tool can be any one of a ruler, a vernier caliper or other dimensional measuring instruments, but is not limited thereto.

[0078] In one embodiment, please refer to Figures 8 to 9, the expansion member 130 further includes: a plurality of flow blocking portions 133, the plurality of flow blocking portions 133 are all convexly provided on the side of the expansion portion 132 close to the open end of the cavity 111, the plurality of flow blocking portions 133 can extend along the first direction Y, and the plurality of flow blocking portions 133 can also extend in the second direction X, but not limited thereto, so that the expansion member 130 can perform injection molding encapsulation on different single cells 200, having versatility. Adjacent two flow blocking portions 133 are arranged at intervals to form a flow blocking groove 134 between the adjacent two flow blocking portions 133.

[0079] Wherein, the flow blocking portion 133 can be integrally formed with the expansion portion 132, that is, the flow blocking portion 133 and the expansion portion 132 are of an integral structure. Exemplarily, the flow blocking portion 133 and the expansion portion 132 are integrally injection molded. The flow blocking portion 133 can also be separately provided from the expansion portion 132, and the two are fixedly connected. Exemplarily, the flow blocking portion 133 is fixedly connected to the expansion portion 132 through processes such as bonding. In this application, no specific limitation is made, and it can be specifically set according to the actual situation.

[0080] Wherein, the flow blocking portion 133 can be any one of a straight shape or a curved shape, but not limited thereto.

[0081] In this application, by providing the flow blocking portion 133 on the side of the expansion portion 132 close to the open end of the cavity 111, and a flow blocking groove 134 is formed between adjacent two flow blocking portions 133, so that when the injection mold 100 injects glue for encapsulation, the flow blocking portion 133 contacts the glue, so that the flow resistance of the glue becomes larger and the flow rate becomes slower, thereby reducing glue overflow and further ensuring the injection molding encapsulation effect of the single cell 200.

[0082] In one embodiment, please refer to Figure 3 , in this application, in order to monitor the air pressure in the expansion cavity 1321 in real time, the injection mold 100 further includes: a first pressure sensor 140, a first connecting pipe 150 and a second connecting pipe 160; the first pressure sensor 140 is communicated with the output end of the air source part through the first connecting pipe 150 and is communicated with the communication hole 1311 through the second connecting pipe 160, and the first pressure sensor 140 is configured to monitor the air pressure in the expansion cavity 1321.

[0083] Wherein, the first pressure sensor 140 can be a capacitive sensor or an inductive sensor, but not limited thereto.

[0084] In this application, by providing the first pressure sensor 140, the air pressure in the expansion cavity 1321 is detected in real time by using the first pressure sensor 140, preventing the excessive expansion of the expansion part 132 due to the excessive air pressure in the expansion cavity 1321 and damaging the single cell 200. At the same time, when the injection mold 100 injects glue, the glue gradually fills the cavity 111, causing the glue to contact the expansion part 132, resulting in the deformation of the expansion part 132 and the change of the air pressure in the expansion cavity 1321, so as to realize the monitoring of the injection pressure by the first pressure sensor 140, preventing the excessive injection pressure and standardizing the process pressure parameters.

[0085] In one embodiment, in this application, in order to monitor the injection pressure in the cavity 111 in real time, the injection mold 100 further includes: a second pressure sensor (not shown in the figure). The second pressure sensor can be provided on the first template 110, and the second pressure sensor can also be provided on the second template 120. There is no specific limitation in this application, and it can be specifically selected according to the actual situation. And the second pressure sensor is located in the cavity 111, and the second pressure sensor is configured to monitor the injection pressure in the cavity 111.

[0086] Among them, the second pressure sensor can be a capacitive sensor or an inductive sensor, but not limited thereto.

[0087] In this application, by providing the second pressure sensor, the real-time monitoring of the injection pressure is carried out by using the second pressure sensor, preventing the excessive injection pressure and standardizing the process pressure parameters.

[0088] In one embodiment, please refer to Figure 3 , a glue inlet channel 112 is provided on the side of the first template 110 close to the expansion part 130, and a glue inlet 121 is provided on the second template 120. The glue inlet channel 112 is respectively communicated with the glue inlet 121 and the cavity 111. In this application, the glue flows from the glue inlet 121 to the glue inlet channel 112, and then flows into the cavity 111 from the glue inlet channel 112 to encapsulate the part of the battery body 210 close to the battery protection board 220.

[0089] In one embodiment, please refer to Figure 3 , a positioning part 113 is provided on the side of the first template 110 close to the second template 120, and a positioning hole 122 is provided on the second template 120. The positioning hole 122 is adapted to the positioning part 113; the positioning part 113 is embedded in the positioning hole 122 to position and fix the first template 110 and the second template 120, so as to ensure the close fit between the first template 110 and the second template 120 and ensure the normal progress of the injection operation of the injection mold 100.

[0090] Among them, both the positioning hole 122 and the positioning part 113 are polygonal or circular, but not limited thereto.

[0091] In summary, in the present application, by providing the expansion member 130, the deformed expansion member 130 is utilized to make the expansion part 132 of the expansion member 130 abut against the part of the battery body 210 close to the battery protection board 220, so as to prevent the glue from flowing to other parts of the single battery 200, enabling the glue to preferably form an injection molding structure, effectively solving the problem of serious glue overflow in the encapsulation of the single battery 200, and ensuring the injection molding encapsulation effect of the single battery 200.

[0092] The introduction provided in the above steps is only used to help understand the method, structure and core idea of the present application. For those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An injection mold having a first direction, characterized in that: include: A first template is provided with a cavity having an opening; A second template, a movable cover, is disposed on the opening of the cavity; A single battery is disposed in the cavity, and the single battery comprises: a battery body and a battery protection plate, the battery body extends along the first direction, and the battery protection plate is disposed on one side of the battery body in the first direction; and An expansion member is arranged on a side of the second template close to the battery protection plate of the single battery, wherein an expansion cavity is arranged inside the expansion member, and the expansion cavity is communicated with an external air source member; Under the action of the air source component, the expansion component is deformed so that the expansion component abuts against a portion of the battery body close to the battery protection plate.

2. The injection mold according to claim 1, characterized in that: The expansion member comprises: a fixed portion and an expansion portion connected to each other; The fixing part is arranged on the second template, the expansion part is arranged on the open side of the fixing part close to the cavity, the fixing part and the expansion part cooperate to surround the expansion cavity, a connecting hole is provided on the fixing part, and the air source component is connected with the expansion cavity through the connecting hole; Under the action of the air source component, the expansion portion is deformed so that the expansion portion abuts against a portion of the battery body close to the battery protection plate.

3. The injection mold according to claim 2, characterized in that: The expansion member further comprises: a partition portion, arranged in the expansion cavity, to divide the expansion cavity into a first sub-cavity and a second sub-cavity, the first sub-cavity being arranged close to the mold cavity relative to the second sub-cavity, and the air source member being connected to the second sub-cavity through the connecting hole; The air source component controls the pressure difference between the first sub-cavity and the second sub-cavity to expand the first sub-cavity, so that the expansion portion abuts against a portion of the battery body close to the battery protection plate.

4. The injection mold according to any one of claims 2 to 3, characterized in that The injection mold also has a second direction intersecting the first direction; The maximum dimension of the expansion portion in the second direction is L1 mm, and the maximum dimension of the single battery in the second direction is L2 mm, satisfying: L1≥L2.

5. The injection mold according to any one of claims 2 to 3, characterized in that: The wall thickness of the expansion portion is H1 mm, satisfying: 1≤H1≤2.

6. The injection mold according to claim 2, characterized in that: The injection mold also has a second direction intersecting the first direction; The expansion member also includes: a plurality of flow blocking parts, each of which is protruding from the side of the expansion part close to the open opening of the cavity, and each of which extends along the first direction or the second direction, and two adjacent flow blocking parts are spaced apart to form a flow blocking groove between the two adjacent flow blocking parts.

7. The injection mold according to claim 2, characterized in that: Also includes: A first pressure sensor, a first connecting pipe and a second connecting pipe; The first pressure sensor is connected to the output end of the air source component through the first connecting tube, and is connected to the connecting hole through the second connecting tube. The first pressure sensor is configured to monitor the air pressure in the expansion chamber.

8. The injection mold according to claim 1, characterized in that: Also includes: The second pressure sensor is disposed on the first template or the second template, and the second pressure sensor is located in the cavity, and the second pressure sensor is configured to monitor the injection pressure in the cavity.

9. The injection mold according to claim 1, characterized in that: A glue inlet channel is provided on one side of the first template close to the expansion member, a glue inlet port is provided on the second template, and the glue inlet channel is communicated with the glue inlet port and the mold cavity respectively.

10. The injection mold according to claim 1, characterized in that: A positioning portion is provided on one side of the first template close to the second template, and a positioning hole is provided on the second template, and the positioning hole is adapted to the positioning portion; The positioning portion is embedded in the positioning hole to position and fix the first template and the second template.

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