battery

Abstract

The utility model relates to battery manufacturing technical field discloses a kind of batteries, including electric core, circuit board and first insulating part. Electric core has opposite positive lug and negative lug. Circuit board includes opposite first surface and second surface, the second surface of circuit board is towards electric core, the first surface of circuit board is provided with positive pole area and negative pole area, positive pole area is connected with positive lug, negative pole area is connected with negative lug, and positive pole area and negative pole area are spaced apart. First insulating part, cladding in the outside of the first surface of circuit board, first insulating part is provided with first through hole and second through hole, first through hole is correspondingly set with positive pole area, and second through hole is correspondingly set with negative pole area. The utility model can avoid the short circuit of the positive and negative output end of circuit board.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and specifically to a battery. Background Technology

[0002] While maintaining the mechanical stability of a cylinder, lithium-ion cylindrical pouch batteries achieve higher energy density through aluminum-plastic film encapsulation. The head region of a cylindrical pouch battery typically integrates a protection circuit board, and both the positive and negative output terminals are connected to this circuit board. This concentrates the positive and negative terminals within the narrow space of the battery head, forming a side-by-side metal conductive structure.

[0003] While the compact layout described above is beneficial for the overall miniaturization of the battery, the spacing between the positive and negative output terminals is extremely small. If the two terminals come into direct contact, it will cause an internal short circuit. Therefore, an efficient and reliable physical isolation barrier must be set up. Utility Model Content

[0004] In view of this, the present invention provides a battery to solve the problem of avoiding short circuits at the positive and negative output terminals of the circuit board.

[0005] This utility model provides a battery, comprising:

[0006] The battery cell has opposing positive and negative tabs;

[0007] A circuit board includes a first side and a second side facing each other, the second side of the circuit board facing the battery cell, the first side of the circuit board having a positive electrode region and a negative electrode region, the positive electrode region being connected to the positive electrode tab, the negative electrode region being connected to the negative electrode tab, and the positive electrode region and the negative electrode region being spaced apart.

[0008] A first insulating element covers at least one side of the circuit board. The first insulating element has a first through hole and a second through hole. The first through hole is disposed corresponding to the positive electrode region, and the second through hole is disposed corresponding to the negative electrode region.

[0009] Beneficial effects: By setting a first insulating component covering the first side of the circuit board and opening through holes at the corresponding positive and negative pole areas, the output terminal is connected to external devices, while ensuring comprehensive insulation protection of the circuit board surface except for the conductive area. While maintaining a compact layout, this structure avoids the risk of insulation failure caused by thermal expansion or vibration of traditional tape / spacers, and eliminates the coverage blind spots that may be generated by manual dispensing through the through hole limiting design. It significantly improves the long-term insulation reliability of the head area and avoids the problem of accidental contact between the positive and negative pole areas, which may lead to short circuits.

[0010] In one alternative implementation, one of the positive electrode region and the negative electrode region is configured as a ring structure and is sleeved on the outside of the other.

[0011] Beneficial effects: Designing one of the positive and negative electrode regions as a ring-shaped nested structure makes full use of the radial space of the circuit board and maximizes the spacing between the positive and negative electrodes within the same area; this nested layout not only enhances the inter-electrode withstand voltage strength, but also blocks potential creepage paths through physical isolation, which is especially suitable for high-voltage battery scenarios and reduces the probability of micro short circuits from the structural source.

[0012] In one optional embodiment, the second side of the circuit board is provided with a positive terminal and a negative terminal, the positive terminal being connected to the positive region and the positive tab respectively, and the negative terminal being connected to the negative region and the negative tab respectively.

[0013] Beneficial effects: Positive and negative terminals are set on the second side of the circuit board, and the tabs are bridged to the surface conductive area, respectively, to build a three-dimensional conductive path through the circuit board; This design concentrates the soldering points inside the board, which reduces the risk of external mechanical damage and disperses the charging and discharging stress through the rigidity of the board itself, effectively suppressing the breakage risk caused by the direct external lead of the tabs in traditional circuits.

[0014] In one alternative implementation, it further includes:

[0015] A connector is disposed on the outer wall of the battery cell and includes a first end and a second end opposite to each other. The first end of the connector is connected to a tab disposed at the end of the battery cell away from the circuit board, and the second end of the connector is connected to the corresponding negative terminal or the positive terminal.

[0016] Beneficial effects: By adding connectors to lead the remote tabs to the circuit board, centralized management of all tabs at the battery head is achieved. This structure solves the limitations of traditional single-end electrode output, allowing for more flexible tab arrangement schemes in the cell, while reducing deformation stress caused by long-distance tab bending, and significantly reducing the risk of connection failure due to metal fatigue.

[0017] In one alternative implementation, it further includes:

[0018] An internal insulating component is disposed between the circuit board and the battery cell, and covers the positive or negative tab, the second end of the connector, the positive connection end, and the negative connection end.

[0019] Beneficial effects: The internal insulation covers key nodes such as the connection points between the circuit board and the battery cell, and the tabs, forming a double isolation barrier in conjunction with the first insulation. This design not only blocks the risk of short circuits between the tabs and the casing, but also inhibits the corrosion of metal contacts by electrolyte vapor by filling the gaps, extending the battery's lifespan in humid and hot environments. It also further improves the connection stability between the circuit board and the tabs.

[0020] In one optional embodiment, the circuit board is provided with injection holes, and an insulating post is provided in the injection holes. The insulating post is connected to the internal insulating component and the first insulating component, respectively.

[0021] Beneficial effects: The design of the injection hole and the insulating post allows the internal insulating component to connect with the first insulating component, thereby improving the connection strength of the first insulating component.

[0022] In one alternative implementation, it further includes:

[0023] A second insulating element is disposed at the end of the battery cell away from the circuit board and covers the positive or negative tab.

[0024] Beneficial effects: By setting a second insulating component at the far end of the battery cell to cover the root of the electrode tab, the wear problem of the encapsulated aluminum-plastic film caused by the vibration of the electrode tab being suspended in the traditional structure is solved; through local reinforcement and protection, electrolyte leakage from the electrode tab puncture point is avoided, and the risk of metal burrs puncturing the film is reduced during the assembly process.

[0025] In one alternative implementation, it further includes:

[0026] A heat-resistant layer is disposed on the battery cell and covers the connector.

[0027] Beneficial effects: The heat-resistant layer covering the connector can prevent abnormal heating of the connector. At the same time, after covering the connector, it can also increase the flatness of the cell's circumference and avoid additional protrusions on the battery surface due to the connector.

[0028] In one alternative embodiment, the insulating pillar, the internal insulating element, and the first insulating element are constructed as a single injection-molded structure.

[0029] Beneficial effects: The one-piece injection molding structure melts the insulating column, internal insulating component and first insulating component into a single solid, completely eliminating the assembly gap of traditional split insulating components; this seamless encapsulation not only achieves full-area equipotential shielding, but also greatly improves the dimensional stability of the insulation system under thermal shock due to the continuity of materials.

[0030] In one optional embodiment, a gasket is provided between the positive electrode tab and the battery cell, and between the negative electrode tab and the battery cell.

[0031] Beneficial effects: The gasket added between the tab and the cell alleviates the problem of active material falling off due to stress concentration at the bend of the tab; the gasket can not only absorb the micro-vibration between the electrode assembly and the tab, but also reduce the risk of metal burrs piercing the membrane during assembly. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a battery according to an embodiment of the present utility model;

[0034] Figure 2 This is a schematic diagram of the structure of the first insulating component in an embodiment of this utility model;

[0035] Figure 3 This is a schematic diagram of the circuit board structure in an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the second insulating component in an embodiment of this utility model;

[0037] Figure 5 This is a schematic diagram of the structure of the heat-resistant layer in an embodiment of this utility model;

[0038] Figure 6 A schematic diagram of the connector in an embodiment of this utility model;

[0039] Figure 7 A schematic diagram of the negative electrode tab in this embodiment of the present invention;

[0040] Figure 8 A schematic diagram of the positive electrode tab in this embodiment of the present invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Battery cell; 101. Positive tab; 102. Negative tab; 2. Circuit board; 201. First side; 202. Second side; 203. Positive area; 204. Negative area; 205. Positive connection terminal; 206. Negative connection terminal; 207. Injection hole; 3. First insulating component; 301. First through hole; 302. Second through hole; 4. Connector; 5. Insulating post; 6. Second insulating component; 7. Heat-resistant layer; 8. Gasket; 9. Heat shrink tubing; 10. Sticker. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] The following is combined Figures 1 to 8 The following describes embodiments of the present invention.

[0045] According to an embodiment of the present invention, a battery is provided, including a battery cell 1, a circuit board 2, and a first insulating member 3. The battery cell 1 has a positive electrode tab 101 and a negative electrode tab 102 at its two ends. The circuit board 2 includes a first surface 201 and a second surface 202 facing each other, with the second surface 202 facing the battery cell 1. The first surface 201 of the circuit board 2 has a positive electrode region 203 and a negative electrode region 204. The positive electrode region 203 is connected to the positive electrode tab 101, and the negative electrode region 204 is connected to the negative electrode tab 102. The positive electrode region 203 and the negative electrode region 204 are spaced apart. The first insulating member 3 covers at least the first surface 201 of the circuit board 2. The first insulating member 3 has a first through hole 301 and a second through hole 302. The first through hole 301 corresponds to the positive electrode region 203, and the second through hole 302 corresponds to the negative electrode region 204.

[0046] It should be noted that, as Figure 1 As shown, circuit board 2 is configured as a protective circuit board 2, i.e., a PCB board. The first side 201 and the second side 202 of circuit board 2 are specifically two opposite sides of circuit board 2, each with corresponding interfaces and connection points. The positive electrode tab 101 and the negative electrode tab 102 of battery cell 1 are both connected to circuit board 2, realizing the integration of positive and negative contacts in the head area of ​​battery cell 1.

[0047] It is understandable that a first through hole 301 and a second through hole 302 corresponding to the positive electrode region 203 and the negative electrode region 204 are provided on the first insulating member 3, so that the positions on the first insulating member 3 without through holes can form a barrier to the positive electrode region 203 and the negative electrode region 204, thereby preventing the occurrence of accidental short circuit between the positive electrode region 203 and the negative electrode region 204.

[0048] Optionally, the positive electrode region 203 is adapted to the shape of the first through hole 301, and the negative electrode region 204 is adapted to the shape of the second through hole 302, and the first through hole 301 and the second through hole 302 can expose the positive electrode region 203 and the negative electrode region 204 completely.

[0049] Optionally, such as Figure 2 As shown, the first insulating member 3 can be configured as a cylindrical structure, which completely covers the first surface 201 of the circuit board 2 and the outer peripheral surface between the first surface 201 and the second surface 202, and the first insulating member 3 is connected to the battery cell 1.

[0050] Optionally, the positive electrode 101 is located between the circuit board 2 and the battery cell 1, and the negative electrode 102 is located at the other opposite end of the battery cell 1.

[0051] Optionally, the negative electrode 102 is located between the circuit board 2 and the battery cell 1, and the positive electrode 101 is located at the other opposite end of the battery cell 1.

[0052] In this embodiment, by setting a first insulating member 3 covering the first surface 201 of the circuit board 2 and opening through holes at the corresponding positive and negative pole areas, the output terminal is connected to external devices, while ensuring comprehensive insulation protection of the surface of the circuit board 2 except for the conductive area. This structure, while maintaining a compact layout, avoids the risk of insulation failure caused by thermal expansion or vibration of traditional tape / spacers, and eliminates the coverage blind spots that may be generated by manual dispensing through the through hole limiting design. It significantly improves the long-term insulation reliability of the head area and avoids the problem of accidental contact between the positive pole area 203 and the negative pole area 204, which could lead to a short circuit.

[0053] In one embodiment, such as Figure 6 As shown, one of the positive electrode region 203 and the negative electrode region 204 is configured as a ring structure and is sleeved on the outside of the other.

[0054] Optionally, the positive electrode region 203 and the negative electrode region 204 can also be configured with other shapes, such as polygons or near-circular shapes, as long as the positive electrode region 203 and the negative electrode region 204 are spaced apart. The corresponding first through hole 301 and second through hole 302 are also configured with corresponding structures.

[0055] Optionally, such as Figure 2 As shown, when one of the positive electrode region 203 and the negative electrode region 204 is set as a ring structure, the other can be set as any shape, such as a polygon, a near-circular shape, or a ring. Simultaneously, a connecting part is provided in the middle of the first through hole 301 or the second through hole 302, which is set as a ring region, to connect the part located in the middle of the first insulating member 3, ensuring the integrity of the first insulating member 3.

[0056] In this embodiment, one of the positive electrode region 203 and the negative electrode region 204 is designed as a ring-shaped nested structure, which makes full use of the radial space of the circuit board 2 and maximizes the positive and negative electrode spacing within the same area. This nested layout not only enhances the inter-electrode withstand voltage strength, but also blocks potential creepage paths through physical isolation, which is especially suitable for high-voltage battery scenarios and reduces the probability of micro short circuits from the structural source.

[0057] In one embodiment, such as Figure 3 As shown, the second side 202 of the circuit board 2 is provided with a positive terminal 205 and a negative terminal 206. The positive terminal 205 is connected to the positive region 203 and the positive tab 101 respectively, and the negative terminal 206 is connected to the negative region 204 and the negative tab 102 respectively.

[0058] Understandably, the positive terminal 205 and the negative terminal 206 are electrically connected to the positive region 203 and the negative region 204, respectively, and the connection circuit is located inside the circuit board 2.

[0059] In this embodiment, a positive terminal 205 and a negative terminal 206 are provided on the second side 202 of the circuit board 2, and the tabs are bridged to the surface conductive area, respectively, to construct a three-dimensional conductive path through the circuit board 2. This design concentrates the soldering points inside the board, which reduces the risk of external mechanical damage and disperses the charging and discharging stress through the rigidity of the board itself, effectively suppressing the breakage risk caused by the direct external lead of the tabs in the traditional method.

[0060] In one embodiment, a connector 4 is further included, disposed on the outer wall of the battery cell 1, including a first end and a second end opposite to each other. The first end of the connector 4 is connected to a tab disposed at the end of the battery cell 1 away from the circuit board 2, and the second end of the connector 4 is connected to a corresponding negative terminal 206 or positive terminal 205.

[0061] Optionally, the connector 4 is configured as a strip structure, with its first and second ends arranged along its length.

[0062] Optionally, the connector 4 can be a nickel strip, in which case the negative electrode tab 102 is located on the cell 1 at the end away from the circuit board 2.

[0063] In this embodiment, by adding a connector 4 to lead the remote electrode to the circuit board 2, centralized management of all electrodes at the battery head is achieved. This structure solves the limitation of traditional single-end electrode output, allowing the cell 1 to adopt a more flexible electrode arrangement scheme, while reducing the deformation stress caused by long-distance electrode bending, and significantly reducing the risk of connection failure caused by metal fatigue.

[0064] In one embodiment, an internal insulating component is also included, disposed between the circuit board 2 and the battery cell 1, and covering the positive electrode tab 101 or the negative electrode tab 102, the second end of the connector 4, the positive electrode connection end 205 and the negative electrode connection end 206.

[0065] Understandably, both the internal insulating component and the first insulating component 3 are injection molded parts, and the two are integrally formed. The internal insulating component is not shown in the drawings.

[0066] In this embodiment, the internal insulating component covers the connection points between the circuit board 2 and the battery cell 1, as well as key nodes such as the tabs, forming a double isolation barrier in conjunction with the first insulating component 3. This design not only blocks the risk of short circuits between the tabs and the casing, but also inhibits the corrosion of metal contacts by electrolyte vapor by filling the gaps, extending the battery's service life in humid and hot environments. It also further improves the connection stability between the circuit board 2 and the tabs.

[0067] In one embodiment, such as Figure 3 As shown, the circuit board 2 is provided with injection holes 207, and an insulating post 5 is provided in the injection holes 207. The insulating post 5 is connected to the internal insulating component and the first insulating component 3 respectively.

[0068] Optionally, the injection hole 207 can be located at any position on the circuit board 2, either on the positive electrode region 203 and the negative electrode region 204, or in other areas of the circuit board 2.

[0069] Optionally, multiple injection holes 207 may be provided to enhance the connection strength between the internal insulation component and the first insulation component 3.

[0070] Optionally, the plurality of injection holes 207 may be equally spaced along the circumference of the circuit board 2.

[0071] In this embodiment, the design of the injection hole 207 and the insulating post 5 allows the internal insulating component to be connected to the first insulating component 3, thereby improving the connection strength of the first insulating component 3.

[0072] In one embodiment, a second insulating member 6 is further included, disposed at the end of the cell 1 away from the circuit board 2, and covering the positive electrode tab 101 or the negative electrode tab 102.

[0073] It is understandable that the second insulating component 6 can be configured as an injection molded part.

[0074] Optionally, the injection molded part is specifically injection molded material.

[0075] In this embodiment, a second insulating component 6 is provided at the far end of the cell 1 to cover the root of the electrode tab, which solves the problem of wear of the encapsulated aluminum-plastic film caused by the suspension and vibration of the electrode tab in the traditional structure; through local reinforcement and protection, electrolyte leakage from the electrode tab puncture point is avoided, and the risk of metal burrs puncturing the film is reduced during the assembly process.

[0076] In one embodiment, such as Figure 5 As shown, it also includes a heat-resistant layer 7, which is disposed on the battery cell 1 and covers the connector 4.

[0077] Optionally, the heat-resistant layer 7 can be high-temperature adhesive tape, which is directly attached to the outside of the battery cell 1 and the connector 4.

[0078] Optionally, such as Figure 1As shown, after the heat-resistant layer 7 is pasted, a heat-shrinkable sleeve 9 is then installed on the outside of the whole. One end of the heat-shrinkable sleeve 9 is open to expose the circuit board 2.

[0079] Optionally, a sticker 10 may be affixed to the outside of the heat shrink tubing 9, with a trademark or instruction printed on the sticker 10.

[0080] In this embodiment, the heat-resistant layer 7 covering the connector 4 can block the abnormal heating of the connector 4. At the same time, after covering the connector 4, it can also increase the flatness of the cell surface and avoid additional protrusions on the battery surface due to the setting of the connector 4.

[0081] In one embodiment, such as Figure 2 As shown, the insulating column 5, the internal insulating component and the first insulating component 3 are constructed as an integral injection-molded structure.

[0082] Understandably, the insulating injection is the portion of the injection molding compound that flows into the injection hole 207 during injection molding, and it is integrated with the internal insulating component and the first insulating component 3.

[0083] In this embodiment, the integral injection molding structure melts the insulating pillar 5, the internal insulating component and the first insulating component 3 into a single solid, eliminating the assembly gap of traditional split insulating components; this seamless encapsulation not only achieves full-area equipotential shielding, but also improves the dimensional stability of the insulation system under thermal shock due to the continuity of the material.

[0084] In one embodiment, such as Figure 7 and Figure 8 As shown, gaskets 8 are provided between the positive electrode tab 101 and the battery cell 1, and between the negative electrode tab 102 and the battery cell 1.

[0085] Understandably, pad 8 can be set to EVA cotton.

[0086] In this embodiment, the gasket 8 added between the tab and the cell 1 alleviates the problem of active material falling off due to stress concentration at the bend of the tab; the gasket 8 can not only absorb the micro-vibration between the electrode assembly and the tab, but also reduce the risk of metal burrs piercing the membrane during the assembly process.

[0087] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, include: The battery cell (1) has a positive tab (101) and a negative tab (102) with opposite sides; The circuit board (2) includes a first side (201) and a second side (202) facing each other. The second side (202) of the circuit board (2) faces the battery cell (1). The first side (201) of the circuit board (2) is provided with a positive electrode region (203) and a negative electrode region (204). The positive electrode region (203) is connected to the positive electrode tab (101), and the negative electrode region (204) is connected to the negative electrode tab (102). The positive electrode region (203) and the negative electrode region (204) are spaced apart. A first insulating element (3) covers at least the first surface (201) of the circuit board (2). The first insulating element (3) is provided with a first through hole (301) and a second through hole (302). The first through hole (301) is provided corresponding to the positive electrode region (203), and the second through hole (302) is provided corresponding to the negative electrode region (204).

2. The battery according to claim 1, characterized in that, One of the positive electrode region (203) and the negative electrode region (204) is configured as a ring structure and is sleeved on the outside of the other.

3. The battery according to claim 1, characterized in that, The second side (202) of the circuit board (2) is provided with a positive terminal (205) and a negative terminal (206). The positive terminal (205) is connected to the positive region (203) and the positive tab (101) respectively, and the negative terminal (206) is connected to the negative region (204) and the negative tab (102) respectively.

4. The battery according to claim 3, characterized in that, Also includes: A connector (4) is disposed on the outer wall of the battery cell (1) and includes a first end and a second end opposite to each other. The first end of the connector (4) is connected to a tab disposed on the end of the battery cell (1) away from the circuit board (2), and the second end of the connector (4) is connected to the corresponding negative terminal (206) or positive terminal (205).

5. The battery according to claim 4, characterized in that, Also includes: An internal insulating component is disposed between the circuit board (2) and the battery cell (1), and covers the positive electrode tab (101) or the negative electrode tab (102), the second end of the connector (4), the positive electrode connection end (205), and the negative electrode connection end (206).

6. The battery according to claim 5, characterized in that, The circuit board (2) is provided with an injection hole (207), and an insulating post (5) is provided in the injection hole (207). The insulating post (5) is connected to the internal insulating component and the first insulating component (3) respectively.

7. The battery according to claim 1, characterized in that, Also includes: The second insulating element (6) is disposed at the end of the battery cell (1) away from the circuit board (2) and covers the positive electrode tab (101) or the negative electrode tab (102).

8. The battery according to claim 4, characterized in that, Also includes: A heat-resistant layer (7) is disposed on the battery cell (1) and covers the connector (4).

9. The battery according to claim 6, characterized in that, The insulating column (5), the internal insulating component, and the first insulating component (3) are constructed as an integral injection-molded structure.

10. The battery according to claim 1, characterized in that, Gaskets (8) are provided between the positive electrode tab (101) and the battery cell (1), and between the negative electrode tab (102) and the battery cell (1).

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