Battery monomer and battery

Abstract

The utility model relates to a battery monomer and a battery. Each single battery comprises a shell, a battery cell, a supporting plate and an insulating film, the insulating film sleeves the battery cell, the insulating film and the supporting plate are accommodated in the shell, the supporting plate is positioned between the bottom wall of the shell and the insulating film and is connected with the insulating film, and an anti-explosion valve is arranged on the bottom wall of the shell; the insulating film is provided with a first positioning part and a first through hole which correspond to the explosion-proof valve, the supporting plate is provided with a second positioning part and a second through hole, the second positioning part coincides with the central axis of the first positioning part, and the second through hole coincides with the orthographic projection part of the first through hole and the orthographic projection part of the explosion-proof valve on the bottom wall of the shell respectively to form a pressure relief channel. Through the first positioning part and the second positioning part, the supporting plate can be accurately mounted at a preset position, so that the second through hole can partially coincide with the orthographic projection of the first through hole and the anti-explosion valve, a pressure relief channel is accurately formed, gas generated in the battery cell can be guided into the anti-explosion valve through the pressure relief channel in time, and the anti-explosion valve can be conveniently opened in time; the safety performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, in particular to a battery monomer and a battery. Background Art

[0002] Most battery cells are hard shell structures, and their bare cells are basically wound or laminated structures made by separating the cathode and anode sheets with an isolation membrane. With the increasing requirements for battery cell safety, the arrangement of the positive and negative electrical connections of the battery cells and the explosion-proof valves of the battery cells on opposite sides has emerged. This design can achieve thermal and electrical separation, that is, when the battery cell explosion-proof valve is opened due to abuse or thermal runaway, the gas and heat inside the battery cell will not directly erupt toward the positive and negative electrical connections. This can largely avoid or slow down the thermal runaway of a single battery cell and cause thermal runaway of the module or system, greatly improving the safety of the battery cell and the system. However, there is a situation in which the explosion-proof valve of existing battery cells cannot be opened normally, which in turn causes the battery cell to explode, resulting in low safety performance of the battery cell. Utility Model Content

[0003] Based on this, it is necessary to provide a battery cell to address the technical problem that the explosion-proof valve of the existing battery cell cannot be opened normally, thereby causing the battery cell to explode, resulting in low safety performance of the battery cell.

[0004] A battery cell, comprising a shell, a battery cell, a support plate and an insulating film, wherein the insulating film is sleeved on the battery cell, and the battery cell, the support plate and the insulating film are all accommodated in the shell, the support plate is located between the bottom wall of the shell and the insulating film, and the support plate is connected to the insulating film, and an explosion-proof valve is provided on the bottom wall of the shell;

[0005] The insulating film is provided with a first positioning portion and a first through hole corresponding to the explosion-proof valve, and the support plate is provided with a second positioning portion and a second through hole, the second positioning portion coincides with the central axis of the first positioning portion, the second through hole coincides with the orthographic projection of the first through hole on the bottom wall of the shell, and coincides with the orthographic projection of the explosion-proof valve on the bottom wall of the shell, so as to form a pressure relief channel.

[0006] In one embodiment, the second through hole coincides with the central axis of the explosion-proof valve, or the first through hole coincides with the central axis of the second through hole and the explosion-proof valve.

[0007] In one of the embodiments, the explosion-proof valve protrudes toward the battery core to form a protrusion.

[0008] In one embodiment, the outer contour dimension of the protrusion is smaller than the radial dimension of the second through hole, and the protrusion partially extends into the second through hole.

[0009] In one of the embodiments, the support plate is further provided with an auxiliary hole, the auxiliary hole is staggered with the first through hole, and the auxiliary hole passes through the support plate, and the auxiliary hole is used for the electrolyte at the bottom of the shell to pass through.

[0010] In one of the embodiments, a liquid cooling hole is further provided on a side of the insulating film corresponding to the explosion-proof valve, the liquid cooling hole is staggered with the auxiliary hole, and the liquid cooling hole is used for allowing the electrolyte to pass through.

[0011] In one of the embodiments, there are a plurality of liquid cooling holes, and the liquid cooling holes are arranged at intervals in the area corresponding to the edge of the insulating film and the support plate.

[0012] In one embodiment, the auxiliary hole is connected to the second through hole.

[0013] In one embodiment, a first positioning hole is provided on the insulating film, and a second positioning hole is provided on the support plate. The first positioning hole and the second positioning hole have the same aperture, and the central axes of the first positioning hole and the second positioning hole coincide with each other. The first positioning hole is configured as the first positioning portion, and the second positioning hole is configured as the second positioning portion.

[0014] The utility model also provides a battery, which can solve at least one of the above technical problems.

[0015] A battery comprises the above-mentioned battery monomer.

[0016] Beneficial effects:

[0017] The battery cell provided by the embodiment of the utility model includes a shell, a battery cell, a support plate and an insulating film, the insulating film is sleeved on the battery cell, and the battery cell, the support plate and the insulating film are all accommodated in the shell, the support plate is located between the bottom wall of the shell and the insulating film, and the support plate is connected to the insulating film, and an explosion-proof valve is provided on the bottom wall of the shell; a first positioning portion and a first through hole corresponding to the explosion-proof valve are provided on the insulating film, a second positioning portion and a second through hole are provided on the support plate, the second positioning portion coincides with the central axis of the first positioning portion, the second through hole coincides with the orthographic projection portion of the first through hole on the bottom wall of the shell, and coincides with the orthographic projection portion of the explosion-proof valve on the bottom wall of the shell to form a pressure relief channel. In the present application, a first positioning portion and a second positioning portion are provided on the insulating film and the support plate, and the central axis of the second positioning portion coincides with that of the first positioning portion, so that the support plate can be accurately installed in a preset position, thereby accurately defining the relative position of the second through hole and the first through hole, so that the second through hole can respectively coincide with the orthographic projection of the first through hole and the explosion-proof valve on the bottom wall of the shell, thereby accurately forming a pressure relief channel, so that the gas generated in the battery cell can be introduced into the explosion-proof valve through the pressure relief channel in time, thereby facilitating the timely opening of the explosion-proof valve and improving the safety performance of the battery cell.

[0018] The utility model also provides a battery, comprising the above-mentioned battery monomer, and the battery can achieve at least one of the above-mentioned technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 An exploded view of a battery cell provided in one embodiment of the utility model.

[0020] Figure 2 A cross-sectional view of a battery cell provided in accordance with an embodiment of the present invention.

[0021] Figure 3 for Figure 2 Enlarged image of .

[0022] Figure 4 A schematic diagram of a support plate in a battery cell provided in one embodiment of the utility model.

[0023] Figure Number:

[0024] 110-battery cell; 120-top cover; 121-positive electrical connector; 122-negative electrical connector; 130-positive adapter plate; 140-negative adapter plate; 200-insulating film; 210-first through hole; 220-first positioning portion; 230-liquid cooling hole; 300-support plate; 310-second through hole; 320-second positioning portion; 330-auxiliary hole; 340-welding point; 400-shell; 410-bottom wall; 420-explosion-proof valve hole; 500-explosion-proof valve; 510-protrusion. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0031] See also Figure 1 and Figure 2 , Figure 1 An exploded view of a battery cell provided in one embodiment of the utility model. Figure 2The battery cell provided in one embodiment of the present invention comprises a housing 400, a battery cell 110, a support plate 300 and an insulating film 200. The insulating film 200 is sleeved on the battery cell 110, and the battery cell 110, the support plate 300 and the insulating film 200 are all contained in the housing 400. The support plate 300 is located between the bottom wall 410 of the housing 400 and the insulating film 200, and the support plate 300 is connected to the insulating film 200. The bottom wall 410 of the housing 400 is provided with an explosion-proof valve 50. 0; A first positioning portion 220 and a first through hole 210 corresponding to the explosion-proof valve 500 are provided on the insulating film 200, and a second positioning portion 320 and a second through hole 310 are provided on the supporting plate 300. The second positioning portion 320 coincides with the central axis of the first positioning portion 220, and the second through hole 310 coincides with the orthographic projection portion of the first through hole 210 on the bottom wall of the shell 400, and coincides with the orthographic projection portion of the explosion-proof valve 500 on the bottom wall of the shell 400, so as to form a pressure relief channel.

[0032] Specifically, in the present application, a first positioning portion 220 and a second positioning portion 320 are provided on the insulating film 200 and the support plate 300, and the central axis of the second positioning portion 320 coincides with that of the first positioning portion 220, so that the support plate 300 can be accurately installed at a preset position, thereby accurately defining the relative position of the second through hole 310 and the first through hole 210, so that the second through hole 310 can coincide with the orthographic projection of the first through hole 210 and the explosion-proof valve 500 on the bottom wall of the shell 400, respectively, thereby accurately forming a pressure relief channel, so that the gas generated in the battery cell 110 can be introduced into the explosion-proof valve 500 through the pressure relief channel in time, thereby facilitating the timely opening of the explosion-proof valve 500 and improving the safety performance of the battery cell.

[0033] It should be noted that the insulating film 200 is used to separate the battery cell 110 and the shell 400. Its shape is basically the same as the shell 400, but its size is slightly smaller. The relative position of the insulating film 200 and the explosion-proof valve 500 is fixed. By accurately defining the relative position of the second through hole 310 and the first through hole 210, the relative position of the second through hole 310 and the explosion-proof valve 500 can be accurately defined.

[0034] The bottom wall 410 of the housing 400 is provided with an explosion-proof valve 500 hole 420, and the explosion-proof valve 500 is installed in the explosion-proof valve 500 hole 420. Preferably, the explosion-proof valve 500 is arranged in the middle position of the bottom wall 410 of the housing 400.

[0035] Among them, the bottom of the shell 400 is rounded around, and the support plate 300 is placed between the bottom wall 410 of the shell 400 and the insulating film 200, so that the support plate 300 can support the battery cell 110 and the insulating film 200, and prevent the battery cell 110 and the insulating film 200 from interfering with the rounded corners around the bottom of the shell 400.

[0036] Furthermore, the battery cell also includes a top cover 120, a positive electrode adapter plate 130 and a negative electrode adapter plate 140. The top cover 120 is provided with a positive electrode electrical connector 121 and a negative electrode electrical connector 122. The positive electrode adapter plate 130 and the negative electrode adapter plate 140 are installed on the top of the battery cell 110 and extend out of the shell 400 from the top surface of the battery cell 110, and are electrically connected to the positive electrode electrical connector 121 and the negative electrode electrical connector 122 respectively.

[0037] See also Figure 1 , Figure 2 and Figure 3 , Figure 3 for Figure 2 In one embodiment, the second through hole 310 coincides with the central axis of the explosion-proof valve 500, so that when thermal runaway occurs in the battery cell, the gas in the battery cell 110 can be concentrated on one side of the explosion-proof valve 500 through the second through hole 310, so that the explosion-proof valve 500 can be opened in time, thereby improving the safety of the battery cell.

[0038] See also Figure 1 , Figure 2 and Figure 3 In one embodiment, the central axes of the first through hole 210, the second through hole 310 and the explosion-proof valve 500 coincide with each other, so that when thermal runaway occurs in the battery cell, the gas in the battery cell 110 can be directly concentrated on one side of the explosion-proof valve 500 through the first through hole 210 and the second through hole 310, that is, the air flow path is shortened and the efficiency of opening the explosion-proof valve 500 is improved.

[0039] See also Figure 1 , Figure 2 and Figure 3 In one embodiment, the explosion-proof valve 500 protrudes toward the battery cell 110 to form a protrusion 510, and there is a gap between the protrusion 510 and the insulating film 200, and the gap can form a space for accommodating gas, so that the pressure consistency of the explosion-proof valve 500 is better when releasing pressure.

[0040] See also Figure 1 , Figure 2 and Figure 3 In one embodiment, the outer contour dimension of the protrusion 510 is smaller than the radial dimension of the second through hole 310, and the protrusion 510 partially extends into the second through hole 310, so that the support plate 300 can be assembled flatly with the bottom wall 410 of the shell 400, thereby improving the pressure relief capacity.

[0041] See also Figure 1 and Figure 4 , Figure 4A schematic diagram of a support plate 300 in a battery cell according to an embodiment of the utility model. In one embodiment, the support plate 300 is further provided with an auxiliary hole 330, the auxiliary hole 330 is staggered with the first through hole 210, and the auxiliary hole 330 passes through the support plate 300, and the auxiliary hole 330 is used for the electrolyte at the bottom of the shell 400 to pass through.

[0042] Specifically, the auxiliary hole 330 is provided so that the electrolyte deposited on the bottom of the housing 400 can pass through the support plate 300 and be absorbed by the battery cell 110 through the first through hole 210, thereby improving the service life of the battery cell. The auxiliary hole 330 is staggered with the first through hole 210, thereby ensuring the insulation of the bottom of the battery cell 110 and improving the reliability of the battery cell.

[0043] See also Figure 1 and Figure 4 In one embodiment, a liquid cooling hole 230 is further provided on the side of the insulating film 200 corresponding to the explosion-proof valve 500. The liquid cooling hole 230 is staggered with the auxiliary hole 330. The liquid cooling hole 230 is used to allow electrolyte to pass through, thereby further realizing electrolyte infiltration of the battery cell 110 and improving the reliability of the battery cell 110. The liquid cooling hole 230 also plays a role in guiding gas, further facilitating the gas in the battery cell 110 to be discharged.

[0044] See also Figure 1 and Figure 4 In one embodiment, there are multiple liquid cooling holes 230 , and the liquid cooling holes 230 are arranged at intervals in the areas corresponding to the edges of the insulating film 200 and the support plate 300 .

[0045] Specifically, when the battery cell is in thermal runaway, most of the gas generated by the battery cell 110 is gathered in the central area of ​​the support plate 300, and the liquid cooling hole 230 is arranged in the area corresponding to the edge of the insulating film 200 and the support plate 300, so that most of the gas passes through the first through hole 210, so as to be directly guided to the explosion-proof valve 500 through the second through hole 310, thereby improving the reliability of the battery cell. It should be noted that the inner diameter of the liquid cooling hole 230 is much smaller than that of the first through hole 210.

[0046] Furthermore, in the width direction of the support plate 300 , a plurality of liquid cooling holes 230 are provided on both sides of the first through hole 210 and are arranged at intervals along the length direction of the support plate 300 , thereby increasing the efficiency of liquid conduction.

[0047] See also Figure 1 and Figure 4 In one embodiment, the auxiliary hole 330 is connected to the second through hole 310, so that the gas discharged from the auxiliary hole 330 is directed into the second through hole 310, thereby increasing the exhaust area.

[0048] See also Figure 1 and Figure 4In one embodiment, a first positioning hole is provided on the insulating film 200, and a second positioning hole is provided on the support plate 300. The apertures of the first positioning hole and the second positioning hole are the same, and the central axes of the first positioning hole and the second positioning hole coincide with each other. The first positioning hole is configured as a first positioning portion 220, and the second positioning hole is configured as a second positioning portion 320.

[0049] Specifically, the support plate 300 has a plurality of welding points 340, and the support plate 300 is used to be welded with the insulating film 200. Due to the provision of the first positioning hole and the second positioning hole, the positioning rod can pass through the first positioning hole and the second positioning hole to fix the relative position of the support plate 300 and the insulating film 200, so that the support plate 300 can be accurately welded to the preset position of the insulating film 200 to ensure the formation of the pressure relief channel, thereby improving the reliability of the battery cell.

[0050] In other embodiments, the first positioning portion 220 may also be a groove, and the second positioning portion 320 may be a protrusion 510 , and the protrusion 510 is plug-fitted into the groove.

[0051] See also Figure 1 , Figure 2 and Figure 3 , an embodiment of the utility model also includes a battery, including the above-mentioned battery cell.

[0052] Specifically, in the present application, a first positioning portion 220 and a second positioning portion 320 are provided on the insulating film 200 and the support plate 300, and the central axis of the second positioning portion 320 coincides with that of the first positioning portion 220, so that the support plate 300 can be accurately installed at a preset position, thereby accurately defining the relative position of the second through hole 310 and the first through hole 210, so that the second through hole 310 can coincide with the orthographic projection of the first through hole 210 and the explosion-proof valve 500 on the bottom wall of the shell 400, thereby accurately forming a pressure relief channel, so that the gas generated in the battery cell 110 can be introduced into the explosion-proof valve 500 through the pressure relief channel in time, thereby facilitating the timely opening of the explosion-proof valve 500 and improving the safety performance of the battery cell.

[0053] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises a shell, a battery cell, a support plate and an insulating film, wherein the insulating film is sleeved on the battery cell, and the battery cell, the support plate and the insulating film are all contained in the shell, the support plate is located between the bottom wall of the shell and the insulating film, and the support plate is connected to the insulating film, and an explosion-proof valve is provided on the bottom wall of the shell; The insulating film is provided with a first positioning portion and a first through hole corresponding to the explosion-proof valve, and the support plate is provided with a second positioning portion and a second through hole, the second positioning portion coincides with the central axis of the first positioning portion, the second through hole coincides with the orthographic projection of the first through hole on the bottom wall of the shell, and coincides with the orthographic projection of the explosion-proof valve on the bottom wall of the shell, so as to form a pressure relief channel.

2. The battery cell according to claim 1, characterized in that: The second through hole coincides with the central axis of the explosion-proof valve, or the first through hole coincides with the central axis of the second through hole and the explosion-proof valve.

3. The battery cell according to claim 2, characterized in that: The explosion-proof valve protrudes toward the battery core to form a protrusion.

4. The battery cell according to claim 3, characterized in that: The outer contour dimension of the protrusion is smaller than the radial dimension of the second through hole, and the protrusion partially extends into the second through hole.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The support plate is also provided with an auxiliary hole, the auxiliary hole is staggered with the first through hole, and the auxiliary hole passes through the support plate, and the auxiliary hole is used for the electrolyte at the bottom of the shell to pass through.

6. The battery cell according to claim 5, characterized in that: A liquid cooling hole is further provided on a side of the insulating film corresponding to the explosion-proof valve. The liquid cooling hole is staggered with the auxiliary hole, and the liquid cooling hole is used for allowing the electrolyte to pass through.

7. The battery cell according to claim 6, characterized in that: There are a plurality of liquid cooling holes, and the liquid cooling holes are arranged at intervals in the area corresponding to the insulation film and the edge of the support plate.

8. The battery cell according to claim 6, characterized in that: The auxiliary hole is communicated with the second through hole.

9. The battery cell according to any one of claims 1 to 4, characterized in that: A first positioning hole is provided on the insulating film, and a second positioning hole is provided on the support plate. The first positioning hole and the second positioning hole have the same aperture, and the central axes of the first positioning hole and the second positioning hole coincide with each other. The first positioning hole is configured as the first positioning portion, and the second positioning hole is configured as the second positioning portion.

10. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 9.

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