Connector, battery pack and energy storage power supply

Abstract

This application discloses a connecting piece, a battery pack, and an energy storage power supply. The connecting piece includes a main body and at least two connecting portions. The at least two connecting portions are respectively connected to the main body and configured to connect to the electrodes of a battery cell. The main body has at least one fusible link, each fusible link located between two connecting portions connected to two electrodes of the same polarity. The fusible link is configured to melt when a current greater than or equal to a set value flows through it, thereby creating an open circuit between the corresponding two connecting portions. When one battery cell fails, the current flowing through the fusible link increases significantly, causing the fusible link to melt and disconnecting the two electrodes of the same polarity. This means that the parallel connection of the two battery cells can be broken. When one battery cell fails, the other battery cell will not short-circuit, effectively reducing the risk of runaway propagation and ensuring high safety for battery packs and energy storage power supplies using the connecting piece.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a connector, a battery pack, and an energy storage power supply. Background Technology

[0002] Multiple cells in a battery are connected by connecting tabs. If one of the cells in the parallel branch malfunctions and causes thermal runaway, its resistance decreases, which is equivalent to a wire. This causes the positive and negative terminals of the other cell connected in parallel with the malfunctioning cell to connect, resulting in a short circuit and further thermal runaway. There is a risk that thermal runaway will spread to all the cells in the battery, posing a safety hazard. Utility Model Content

[0003] In view of this, it is necessary to provide a connector and battery pack that improve safety.

[0004] Some embodiments of this application provide a connecting piece for connecting a battery cell. The connecting piece includes a body and at least two connecting portions. The at least two connecting portions are respectively connected to the body and configured to be connected to electrodes of the battery cell. The body has at least one fusible portion, each fusible portion located between two connecting portions connected to two electrodes of the same polarity. The fusible portion is configured to melt when a current greater than or equal to a set value flows through it, thereby forming an open circuit between the corresponding two connecting portions.

[0005] When one cell fails, the current flowing through the fuse increases significantly, causing the fuse to melt and disconnect the two electrodes of the same polarity. This means that the parallel connection between the two cells can be broken. When one cell fails, the other cell will not short-circuit, effectively reducing the risk of the failure spreading and making the battery pack and energy storage power supply using the connecting piece highly safe.

[0006] According to some embodiments of this application, the fuse portion includes a plurality of first regions and a plurality of second regions, each second region being alternately arranged with a first region, and the cross-sectional area of ​​the first region allowing current to flow is much smaller than the cross-sectional area of ​​the second region allowing current to flow.

[0007] In the above embodiments, the cross-sectional area of ​​the first zone that allows current to flow is much smaller than that of the second zone, so that the fuse portion as a whole forms a smaller cross-sectional area for current flow relative to the main body, which is conducive to fuse-breaking when the current reaches the set value.

[0008] According to some embodiments of this application, a plurality of first regions are arranged sequentially, and the arrangement direction of the plurality of first regions intersects the line connecting the connection portion of the two electrodes of the same polarity.

[0009] In the above embodiments, the arrangement direction of the multiple first regions intersects with the line connecting the connection parts of the two electrodes of the same polarity. This is beneficial for the multiple first regions to combine with the multiple second regions to separate the two connection parts connected with the same polarity, thereby improving the reliability of the fuse breaking the connection between the two electrodes of the same polarity.

[0010] According to some embodiments of this application, the first region extends through the connecting piece along the thickness direction of the body.

[0011] In the above embodiments, the first region extends through the connecting piece along the thickness direction of the main body, making the fusible part easier to fuse and improving the reliability of the connecting piece's overcurrent fusion.

[0012] According to some embodiments of this application, the main body includes a first end and a second end opposite to each other, the number of connecting parts is 2N, the electrodes of the battery cell include a first electrode and a second electrode with opposite polarities; N connecting parts connect to the first electrodes of N battery cells, and another N connecting parts connect to the second electrodes of another N battery cells; each pair of connecting parts forms a group and connects the electrodes with opposite polarities of two different battery cells, the N groups of connecting parts are arranged sequentially along the direction from the first end to the second end, the number of fuses is N-1, and each fuse is located between two groups of connecting parts.

[0013] In the above embodiments, each fuse is located between two sets of connecting parts. When one of the cells connected to the connecting piece goes out of control, the fuse adjacent to the connecting part of the cell that went out of control will melt due to overcurrent, effectively reducing the risk of runaway spread.

[0014] According to some embodiments of this application, the N connecting portions connected to the first electrode extend obliquely to one side of the body relative to the first end toward the second end; or the N connecting portions connected to the second electrode extend obliquely to the other side of the body relative to the first end toward the second end.

[0015] In the above embodiments, N connecting portions that connect electrodes of the same polarity extend toward the same side of the main body, and one of the two sets of connecting portions that connect electrodes of different polarities extends obliquely, which is beneficial for the connecting piece to adapt to connecting multiple staggered battery cells.

[0016] According to some embodiments of this application, the main body also provides the fusion portion between two adjacent connecting portions with opposite polarities.

[0017] In the above embodiments, the fuse can cut off the series connection between two sets of parallel cells, thereby reducing the risk of cell damage caused by voltage changes in adjacent cells due to uncontrolled cells.

[0018] According to some embodiments of this application, the connecting portion includes a first portion and a second portion, the first portion extending from the body along the thickness direction of the body, the second portion being connected to the side of the first portion away from the body, and configured to connect the electrode of the battery cell.

[0019] In the above embodiment, the main body is located on the side of the first part away from the second part, the second part is connected to the battery cell, and the first part separates the main body from the battery cell, which is beneficial for separating the part of the connecting piece from the battery cell that is not connected, and for insulating the non-connected area of ​​the connecting piece from the battery cell.

[0020] Some embodiments of this application provide a connecting piece for connecting a battery cell. The connecting piece includes a body and at least two connecting portions. The at least two connecting portions are respectively connected to the body and configured to be connected to electrodes of the battery cell. The body has at least one fusible portion, each fusible portion located between two connecting portions connected to two electrodes of opposite polarity. The fusible portion is configured to melt when a current greater than or equal to a set value flows through it, thereby forming an open circuit between the corresponding two connecting portions.

[0021] The fusible part of the aforementioned connecting piece can cut off the series connection between two cells, thereby reducing the risk of cell damage caused by voltage changes in adjacent cells due to an uncontrolled cell.

[0022] Some embodiments of this application provide a battery pack including multiple battery cells and multiple connecting tabs, at least a portion of the multiple battery cells being connected in series and / or in parallel via the multiple connecting tabs. Each connecting tab includes a body and at least two connecting portions. The at least two connecting portions are respectively connected to the body and configured to be connected to the electrodes of the battery cells; the body is provided with at least one fusible portion, each fusible portion being located between two connecting portions connected to two electrodes of the same polarity, the fusible portion being configured to melt when a current greater than or equal to a set value flows through it, thereby forming an open circuit between the corresponding two connecting portions.

[0023] When one cell in the aforementioned battery pack fails, the current flowing through the fuse increases significantly, causing the fuse to melt and disconnect the two electrodes of the same polarity. This means that the parallel connection between the two cells can be broken. When one cell fails, the other cell will not short-circuit, effectively reducing the risk of the failure spreading and ensuring high safety for battery packs and energy storage power supplies using connecting pieces. Alternatively, the fuse of the connecting piece can cut off the series connection between two cells, reducing the risk of cell damage caused by voltage changes in adjacent cells due to the failure of the cell.

[0024] Some embodiments of this application provide an energy storage power supply, which includes a housing and a battery pack. The battery pack is disposed within the housing and includes multiple battery cells and multiple connecting tabs. At least a portion of the multiple battery cells is connected in series and / or in parallel through the multiple connecting tabs. Each connecting tab includes a main body and at least two connecting portions. The at least two connecting portions are respectively connected to the main body and configured to be connected to the electrodes of the battery cells. The main body is provided with at least one fuse, each fuse located between two connecting portions connected to two electrodes of the same polarity. The fuse is configured to melt when a current greater than or equal to a set value flows through it, thereby forming an open circuit between the corresponding two connecting portions.

[0025] When one cell in the aforementioned energy storage power supply goes out of control, the current flowing through the fuse increases significantly, causing the fuse to melt and disconnect the two electrodes of the same polarity. This means that the parallel connection between the two cells can be broken. When one cell goes out of control, the other cell will not short-circuit, effectively reducing the risk of the runaway cell spreading and ensuring high safety for battery packs and energy storage power supplies using connecting pieces. Alternatively, the fuse of the connecting piece can cut off the series connection between two cells, reducing the risk of cell damage caused by voltage changes in adjacent cells due to the runaway cell. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an energy storage power supply according to an embodiment of this application.

[0027] Figure 2 for Figure 1 The diagram shows an exploded view of the energy storage power source.

[0028] Figure 3 This is a schematic diagram of the structure of a battery pack according to an embodiment of this application.

[0029] Figure 4 for Figure 3 The diagram shown is an exploded view of the battery pack.

[0030] Figure 5 for Figure 3 The diagram shows the structure of the battery pack from another perspective.

[0031] Figure 6 for Figure 5 The diagram shows an enlarged view of the battery pack structure at point A.

[0032] Figure 7 This is a schematic diagram of the structure of a connecting piece according to an embodiment of this application.

[0033] Figures 8 to 10 for Figure 7 The diagram shows the structural schematics of the connecting piece in different embodiments.

[0034] Figure 11 for Figure 7 The diagram shows a structural schematic of the fused portion in another embodiment of the connecting piece.

[0035] Explanation of main component symbols: 300, energy storage power supply; 301, casing; 200, battery pack; 201, battery cell; 2011, first electrode; 2013, second electrode; 203, bracket; 100, 100a, 100b, 100c, 100d, connecting piece; 10, main body; 101, first end; 103, second end; 11, 11c, 11d, fuse part; 111, first zone; 113, second zone; 20, connecting part; 21, first part; 23, second part. Detailed Implementation

[0036] The implementation of this application will now be described with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0038] Some embodiments of this application disclose a connecting piece for connecting a battery cell. The connecting piece includes a body and at least two connecting portions. The at least two connecting portions are respectively connected to the body and configured to be connected to electrodes of the battery cell. The body has at least one fusible portion, each fusible portion located between two connecting portions connected to two electrodes of the same polarity. The fusible portion is configured to melt when a current greater than or equal to a set value flows through it, thereby creating an open circuit between the corresponding two connecting portions.

[0039] When one cell fails, the current flowing through the fuse increases significantly, causing the fuse to melt and disconnect the two electrodes of the same polarity. This means that the parallel connection between the two cells can be broken. When one cell fails, the other cell will not short-circuit, effectively reducing the risk of the failure spreading and making the battery pack and energy storage power supply using the connecting piece highly safe.

[0040] The following section, in conjunction with the accompanying drawings, provides a detailed description of some embodiments of this application. Unless otherwise specified, the following embodiments and features described herein can be combined with each other.

[0041] Please see Figure 1 and Figure 2This application also proposes a battery pack 200 and an energy storage power supply 300. The energy storage power supply 300 includes a housing 301 and a battery pack 200. The battery pack 200 is disposed within the housing 301.

[0042] Please see Figure 3 and Figure 4 One embodiment of this application provides a connecting piece 100. The connecting piece 100 is used to connect the battery cells 201 within the battery pack 200, so that multiple battery cells 201 are connected in series or in parallel. The battery pack 200 includes multiple battery cells 201 and multiple connecting pieces 100.

[0043] like Figure 3 As shown, the battery pack 200 also includes a bracket 203. Multiple battery cells 201 are mounted on the bracket 203. Multiple connecting tabs 100 are mounted on the side of the bracket 203 opposite to the battery cells 201. The bracket 203 has through holes through which the connecting tabs 100 connect to the battery cells 201, but this is not a limitation. For example, in other embodiments, the bracket 203 is omitted, and the connecting tabs 100 are directly connected to the battery cells 201.

[0044] When two cells 201 are connected in parallel via the connecting piece 100, if one cell 201 becomes uncontrolled and acts as a conductor, the two electrodes of the other cell 201 are directly connected through the conductor formed by the uncontrolled cell 201 and the connecting piece 100, causing the other cell 201 to short-circuit and become uncontrolled. If the connecting piece 100 connected to the uncontrolled cell 201 breaks, the uncontrolled cell 201 will be de-energized, and the other cell 201 will not short-circuit, thus preventing the spread of the uncontrolled situation.

[0045] When two battery cells 201 are connected in series via the connecting piece 100, if one of the cells 201 malfunctions and becomes a conductor, the voltage of the other cell 201 will change, potentially causing damage to the cell 201. Breaking the connecting piece 100 disconnects the malfunctioning cell 201 from its adjacent cells 201, reducing the probability of damage to other cells 201 besides the malfunctioning one.

[0046] In one embodiment, the connecting piece 100 is an integral structure, and the connecting piece 100 is an aluminum sheet structure. The structure is simple and easy to form, and has good conductivity. It is understood that in other embodiments, the connecting piece 100 may also adopt other conductive structures, such as copper sheets.

[0047] Please see Figure 5 , Figure 6 and Figure 7The connecting piece 100 includes a main body 10 and at least two connecting portions 20. Each connecting portion 20 is connected to the main body 10 and configured to connect to an electrode of a battery cell 201. Each connecting portion 20 connects at least two battery cells 201 to achieve series or parallel connection between the battery cells 201. In one embodiment, each connecting piece 100 connects four battery cells 201, and the connecting piece 100 includes four connecting portions 20, but is not limited thereto.

[0048] The main body 10 is provided with at least one fuse part 11. Each fuse part 11 is located between two connection parts 20 connected to electrodes of the same polarity. When one cell 201 goes out of control, the current flowing through the fuse part 11 increases significantly, causing the fuse part 11 to melt and disconnect the two battery electrodes of the same polarity. That is, it can disconnect the parallel connection of the two cells 201. When one cell 201 goes out of control, the other cell 201 will not be short-circuited, effectively reducing the risk of the spread of the runaway.

[0049] The electrodes of the battery cell 201 include a first electrode 2011 and a second electrode 2013 with opposite polarities. For example, the first electrode 2011 is the positive electrode and the second electrode 2013 is the negative electrode.

[0050] In one embodiment, each connecting piece 100 has four connecting portions 20. Two connecting portions 20 connect to the first electrodes 2011 of two battery cells 201, and the other two connecting portions 20 connect to the second electrodes 2013 of two other battery cells 201. Two connecting portions 20 of one connecting piece 100 and two connecting portions 20 of another connecting piece 100 connect two battery cells 201, wherein the two connecting portions 20 of one connecting piece 100 connect to the first electrodes 2011 of the two battery cells 201, and the two connecting portions 20 of the other connecting piece 100 connect to the second electrodes 2013 of the two battery cells 201, thus forming a parallel structure for the two battery cells 201. Alternatively, the same connecting piece 100 connects the first electrodes 2011 of two battery cells 201 and the second electrodes 2013 of two other battery cells 201, so that every two battery cells 201 are connected in parallel and then in series.

[0051] In one embodiment, the main body 10 includes a first end 101 and a second end 103 opposite to each other. The two connecting portions 20 of the connecting piece 100 form a group, and the four connecting portions 20 of the connecting piece 100 are divided into two groups. Each group of two connecting portions 20 connects to the first electrode 2011 and the second electrode 2013 of two battery cells 201, respectively. The two groups of connecting portions 20 are arranged along the direction from the first end 101 towards the second end 103. There is one fuse portion 11 located between the two groups of connecting portions 20. The fuse portion 11 melts when the current flowing uncontrollably through the battery cell 201 becomes too large, cutting off the connection between the two first electrodes 2011 connected to the two groups of connecting portions 20, and also cutting off the connection between the two second electrodes 2013 connected to the two groups of connecting portions 20, reducing the risk of short circuits forming between the parallel-connected battery cells 201, and thus reducing the risk of uncontrolled spread.

[0052] It is understood that in other embodiments, the number of connecting portions 20 of the connecting piece 100 may also be other numbers, for example, such as Figure 8 As shown, in the connecting piece 100a, there are six connecting portions 20. Three of the six connecting portions 20 connect to the first electrodes 2011 of three battery cells 201, and the other three connecting portions 20 connect to the second electrodes 2013 of another three battery cells 201. There are two fuse portions 11, each located between two sets of connecting portions 20. The fuse portion 11 melts when the current flowing uncontrollably through the battery cell 201 is too large, cutting off the connection between the two first electrodes 2011 connected to the two sets of connecting portions 20 respectively, and cutting off the connection between the two second electrodes 2013 connected to the two sets of connecting portions 20 respectively, reducing the risk of short circuits forming between the parallel-connected battery cells 201, and thus reducing the risk of uncontrolled spread.

[0053] When the number of connecting portions 20 of the connecting piece 100 is 2N, N connecting portions 20 connect to the first electrodes 2011 of N battery cells 201, and the other N connecting portions 20 connect to the second electrodes 2013 of the other N battery cells 201. Two connecting pieces 100 connect N battery cells 201. N connecting portions 20 of the 2N connecting portions 20 of one connecting piece 100 connect to the first electrodes 2011 of the N battery cells 201, and N connecting portions 20 of the 2N connecting portions 20 of the other connecting piece 100 connect to the second electrodes 2013 of the N battery cells 201, thereby realizing the parallel connection of N battery cells 201.

[0054] Each pair of connection portions 20 forms a group, and each group of connection portions 20 connects two different cells 201 with opposite polarities. N groups of connection portions 20 are arranged sequentially along the direction from the first end 101 to the second end 103. The number of fuse portions 11 is N-1, and each fuse portion 11 is located between two groups of connection portions 20. When one of the cells 201 connected to the connecting piece 100 goes out of control, the fuse portion 11 adjacent to the connection portion 20 connected to the out-of-control cell 201 will melt due to overcurrent, effectively reducing the risk of runaway propagation.

[0055] It is understood that in other embodiments, the multiple cells 201 in the battery pack 200 may also employ different series / parallel connection methods. For example, the battery pack 200 includes two cells 201, and the two cells 201 are connected in a manner such as... Figure 9 The connecting pieces 100b shown are connected in parallel, and each connecting piece 100b includes two connecting portions 20. The two connecting portions 20 of one of the two connecting pieces 100b connect to the first electrodes 2011 of the two battery cells 201, and the two connecting portions 20 of the other connecting piece 100b connect to the second electrodes 2013 of the two battery cells 201, thus realizing the parallel connection of the two battery cells 201. It can be understood that the number of battery cells 201 can also be three or more, and correspondingly, the number of connecting portions 20 of the connecting pieces 100b is the same as the number of battery cells 201.

[0056] It is understood that in other embodiments, the fusible link 11 may also be arranged between the connection portions 20 connected to the two electrodes of opposite polarity. For example, in another embodiment, in Figure 7 or Figure 8 In the embodiment shown, a fusible portion 11 is added to the connecting piece 100. The fusible portion 11 is located between the connecting portion 20 connected to the first electrode 2011 and the connecting portion 20 connected to the second electrode 2013, similar to... Figure 10 The fuse 11c is shown. The fuse 11 can cut off the series connection between two sets of parallel cells 201 to reduce the risk of damage to the cells 201 caused by voltage changes in adjacent cells 201 due to the runaway cell 201.

[0057] It is understandable that the connecting piece 100 can also be used in a battery pack 200 where the cells 201 are connected only in series, for example, Figure 10The connecting piece 100c shown includes two connecting portions 20. One connecting portion 20 is connected to the first electrode 2011 of a battery cell 201, and the other connecting portion 20 is connected to the second electrode 2013 of another battery cell 201. Multiple connecting pieces 100c connect multiple battery cells 201 in series. A fuse portion 11c is located between the connecting portion 20 connected to the first electrode 2011 and the connecting portion 20 connected to the second electrode 2013. The fuse portion 11c can cut off the series connection between two battery cells 201 to reduce the risk of damage to battery cells 201 caused by voltage changes in adjacent battery cells 201 due to a runaway battery cell 201.

[0058] Please see Figure 7 In one embodiment, the N connecting portions 20 connecting the first electrode 2011 extend obliquely to one side of the main body 10 relative to the first end 101 toward the second end 103; or the N connecting portions 20 connecting the second electrode 2013 extend obliquely to the other side of the main body 10 relative to the first end 101 toward the second end 103. That is, the N connecting portions 20 connecting electrodes of the same polarity extend toward the same side of the main body 10, and one of the two sets of connecting portions 20 connecting electrodes of different polarities extends obliquely, which facilitates the connection piece 100 to adapt to connecting multiple staggered battery cells 201.

[0059] In one embodiment, such as Figure 7 As shown, the connecting portion 20 includes a first portion 21 and a second portion 23. The first portion 21 extends from the main body 10 along the thickness direction of the main body 10, and the second portion 23 is connected to the side of the first portion 21 away from the main body 10 and is configured to connect the electrodes of the battery cell 201. The main body 10 is located on the side of the first portion 21 away from the second portion 23, the second portion 23 is connected to the battery cell 201, and the first portion 21 spacees the main body 10 from the battery cell 201, which facilitates the separation of the non-connected portion of the connecting piece 100 from the battery cell 201, and facilitates the insulation of the non-connected area between the connecting piece 100 and the battery cell 201.

[0060] The connecting piece 100 is located on the side of the bracket 203 away from the battery cell 201. The connecting part 20 needs to pass through the bracket 203 to connect with the battery cell 201. The bracket 203 is located between the main body 10 of the connecting piece 100 and the battery cell 201, which helps to improve the insulation of the non-connection area between the connecting piece 100 and the battery cell 201.

[0061] In one embodiment, such as Figure 7 As shown, the fuse section 11 includes a plurality of first regions 111 and a plurality of second regions 113. Each second region 113 is alternately arranged with one first region 111. The cross-sectional area of ​​the first region 111 that allows current to flow is much smaller than the cross-sectional area of ​​the second region 113 that allows current to flow.

[0062] In one embodiment, the first region 111 is generally a rectangular hole that extends through the body 10 along its thickness direction. The second region 113 is a narrow connecting structure formed on one side of the first region 111. The narrow connecting structure can be melted when a current flowing through it is greater than or equal to a set value. It is understood that in other embodiments, the first region 111 may also be an elliptical hole, an oblong hole, or other shapes of hole.

[0063] The first zone 111 extends through the connecting piece 100 along the thickness direction of the main body 10. The cross-sectional area through which current can flow in the first zone 111 is zero, which is much smaller than the cross-sectional area through which current can flow in the second zone 113. Since the cross-sectional area through which current flows in the second zone 113 is much smaller than the cross-sectional area through which current flows in the main body 10, the fuse part 11 is easy to fuse, thus improving the reliability of the overcurrent fuse of the connecting piece 100.

[0064] It is understood that in other embodiments, the first region 111 may include a blind hole structure, that is, the first region 111 does not penetrate the main body 10, and the thickness of the portion of the first region 111 corresponding to the blind hole structure along the thickness direction is less than a certain value, forming a thinner connection structure to meet the requirement of melting when the current flowing through it reaches a set value. The cross-sectional area through which the current flows in the first region 111 is much smaller than the cross-sectional area through which the current flows in the second region 113.

[0065] The cross-sectional area of ​​the first zone 111 that allows current to flow is much smaller than that of the second zone 113, so that the fuse part 11 as a whole forms a smaller cross-sectional area for current flow relative to the main body 10, which is conducive to melting when the current reaches the set value.

[0066] In one embodiment, a plurality of first regions 111 are arranged sequentially, and the arrangement direction of the plurality of first regions 111 intersects the line connecting the connection portion 20 connected to the two electrodes of the same polarity. This is beneficial for the plurality of first regions 111 to combine with a plurality of second regions 113 to separate the two connection portions 20 connected to the same polarity, thereby improving the reliability of the fuse portion 11 melting to disconnect the connection of the two electrodes of the same polarity.

[0067] It is understood that in other embodiments, the fuse portion 11 may also have other structures, for example, such as Figure 11 As shown, in another embodiment, the fuse portion 11d of the connecting piece 100d is provided with a plurality of circular holes. The plurality of circular holes are staggered in both the longitudinal and transverse directions to form a smaller cross-sectional area for current flow between the circular holes, so as to meet the requirement that the current flowing through the fuse portion 11d reaches a set value and melts.

[0068] The aforementioned connecting piece is applied to the battery pack 200 and the energy storage power supply 300. The fuse melts when the current reaches a set value, thereby blocking the connection between the cells 201 connected to the connecting piece, reducing the risk of short circuit in the parallel cells 201, and thus reducing the risk of runaway propagation.

[0069] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and substance of the technical solutions of this application.

Claims

1. A connecting piece for connecting battery cells, the connecting piece comprising: main body; At least two connecting portions, each connected to the main body, and configured to be connected to electrodes of the battery cell; characterized in that: The main body is provided with at least one fuse, each fuse being located between two connection portions connected to two electrodes of the same polarity. The fuse is configured to melt when a current greater than or equal to a set value flows through it, thereby creating an open circuit between the corresponding two connection portions.

2. The tab of claim 1, wherein: The fuse includes multiple first zones and multiple second zones, with each second zone alternating with one first zone. The cross-sectional area of ​​the first zone that allows current to flow is much smaller than the cross-sectional area of ​​the second zone that allows current to flow.

3. The tab of claim 2, wherein: Multiple first regions are arranged sequentially, and the arrangement direction of the multiple first regions intersects the line connecting the connection portion of the two electrodes of the same polarity.

4. The tab of claim 2, wherein: The first region extends through the connecting piece along the thickness direction of the main body.

5. The tab of claim 1, wherein: The main body includes a first end and a second end opposite to each other. The number of connecting parts is 2N. The electrodes of the battery cell include a first electrode and a second electrode with opposite polarities. N connecting parts connect the first electrodes of N battery cells, and another N connecting parts connect the second electrodes of another N battery cells. Each pair of connecting parts forms a group and connects the electrodes with opposite polarities of two different battery cells. The N groups of connecting parts are arranged sequentially along the direction from the first end to the second end. The number of fuses is N-1, and each fuse is located between two groups of connecting parts.

6. The tab of claim 5, wherein: The N connecting portions connected to the first electrode extend obliquely to one side of the body relative to the first end toward the second end; or the N connecting portions connected to the second electrode extend obliquely to the other side of the body relative to the first end toward the second end.

7. The tab according to any one of claims 1 to 6, wherein: The main body also provides the fusible link between two adjacent connecting parts with opposite polarities; or The connection portion includes a first portion and a second portion. The first portion extends from the body along the thickness direction of the body, and the second portion is connected to the side of the first portion away from the body and is configured to connect the electrode of the battery cell.

8. A connecting piece for connecting battery cells, the connecting piece comprising: main body; At least two connecting portions, each connected to the main body, and configured to be connected to electrodes of the battery cell; characterized in that: The main body is provided with at least one fuse, each fuse being located between two connection portions connected to two electrodes of opposite polarity. The fuse is configured to melt when a current greater than or equal to a set value flows through it, thereby creating an open circuit between the corresponding two connection portions.

9. A battery pack comprising a plurality of cells and a plurality of connection tabs, characterized in that, The connecting piece is the connecting piece as described in any one of claims 1 to 8, and at least a portion of the plurality of battery cells are connected in series and / or in parallel through the plurality of the connecting pieces.

10. An energy storage power supply comprising a housing and a battery pack disposed within the housing, characterized by, The battery pack is the battery pack according to claim 9.

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