Single battery cell and vehicle

Abstract

The present application provides a single cell and a vehicle. The single cell includes a battery cell, a housing, a terminal post, and a connecting member. The battery cell includes tabs. The battery cell is located in the housing. Along a first direction, the terminal post is disposed at an end of the housing. The terminal post is provided with an avoidance through hole. The avoidance through hole penetrates the terminal post. Part of the tabs are located in the avoidance through hole. The terminal post is electrically connected to the tabs. The connecting member includes a connected connection body and a core body. Both the tabs and the terminal post are connected to the connection body. The connection body is located in the avoidance through hole. Part of the core body is located on a side of the terminal post facing away from the battery cell. The core body can be separated from the connection body under force. The single cell of the present application can solve the problem that the connection between the tabs and the terminal post occupies a part of the internal space of the single cell, affecting the energy density of the single cell.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to a single cell and a vehicle. Background Art

[0002] With the process of economic globalization and the extensive use of fossil fuels, the problems of environmental pollution and energy shortage have attracted increasing attention. Searching for new energy storage devices has become a research hotspot in the field of new energy. Batteries have rapidly developed into a new generation of energy storage devices due to their advantages such as high energy density, low self-discharge, good cycle performance, and no memory effect, and are used for power support in fields such as information technology, electric vehicles, and aerospace.

[0003] A single cell includes a battery core, a housing, and a terminal post. The battery core can be located inside the housing. The terminal post can be arranged at one end of the housing. One end of the battery core can lead out a tab. The terminal post can be used to connect to an external circuit. The tab and the terminal post are electrically connected inside the single cell. In related technologies, after the tab and the terminal post are connected, they occupy a part of the space inside the single cell, which easily affects the energy density of the single cell. Summary of the Invention

[0004] The present application provides a single cell and a vehicle, which can solve the problem that after the tab and the terminal post are connected, they occupy a part of the space inside the single cell and affect the energy density of the single cell.

[0005] On the one hand, the present application provides a single cell, which includes:

[0006] A battery core including tabs;

[0007] A housing with the battery core located therein;

[0008] A terminal post arranged at the end of the housing along a first direction, the terminal post being provided with an avoidance through hole that penetrates the terminal post, and part of the tabs being located inside the avoidance through hole, the terminal post being electrically connected to the tabs;

[0009] A connecting member including a connected connection body and a core body, both the tabs and the terminal post are connected to the connection body, the connection body is located inside the avoidance through hole, and part of the core body is located on the side of the terminal post facing away from the battery core, and the core body can be separated from the connection body under force.

[0010] For the single cell provided by the present application, the housing and the terminal post can form a receiving space. The battery core can be located inside the receiving space. Part of the tabs led out from one end of the battery core can be located inside the avoidance through hole of the terminal post, and one end of the battery core can extend out of the single cell, so as to reduce the possibility that the tabs occupy the receiving space and affect the size of the battery core, which is beneficial to improving the energy density of the single cell.

[0011] According to an embodiment of the present application, the connecting member includes a breaking portion, and along a first direction, the breaking portion is located between the connecting body and the core body, and the breaking portion is located within the avoiding through hole.

[0012] According to an embodiment of the present application, the connecting body includes a first connecting portion and a second connecting portion. The first connecting portion is located within the tab, the second connecting portion is located within the avoiding through hole, and along the first direction, the second connecting portion is located between the first connecting portion and the breaking portion.

[0013] According to an embodiment of the present application, the connecting body further includes a lapping portion, the lapping portion is located within the avoiding through hole, and along the first direction, the lapping portion is located between the first connecting portion and the second connecting portion, and one end of the lapping portion facing the first connecting portion is connected to the tab.

[0014] According to an embodiment of the present application, the avoiding through hole includes a first through hole, a second through hole, and a third through hole that are connected and communicate with each other. Along the first direction, the second through hole is located between the first through hole and the third through hole. Part of the tab and the lapping portion are located within the first through hole, the second connecting portion and the breaking portion are located within the second through hole, the core body passes through the third through hole, and part of the core body is located on a side of the terminal post facing away from the second connecting portion.

[0015] According to an embodiment of the present application, the first connecting portion is inserted into an end face of the tab facing away from the battery cell, and the end face is connected to the lapping portion.

[0016] According to an embodiment of the present application, along a second direction, the size of either the connecting body or the core body is greater than the size of the breaking portion, and the size of either the first connecting portion or the second connecting portion is less than the size of the lapping portion.

[0017] According to an embodiment of the present application, the cross-sectional shape of the tab located within the first through hole matches the cross-sectional shape of the first through hole, and the cross-section is perpendicular to the first direction; and / or,

[0018] the cross-sectional shape of the lapping portion matches the cross-sectional shape of the first through hole, and the cross-section is perpendicular to the first direction; and / or,

[0019] the cross-sectional shape of the second connecting portion matches the cross-sectional shape of the second through hole, and the cross-section is perpendicular to the first direction.

[0020] According to an embodiment of the present application, the number of the connecting members is multiple, and the multiple connecting members are arranged at intervals along a third direction;

[0021] Alternatively, the tab is connected to the connecting body, and the tab and the connecting member are an integral structure.

[0022] On the other hand, a vehicle provided by the present application includes a single battery cell as described in the above embodiment. The number of the single battery cells is multiple. The multiple single battery cells are connected in series with each other. Description of the Drawings

[0023] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments in line with this application, and are used together with the specification to explain the principles of this application.

[0024] Figure 1 Schematic structural diagram of a single cell according to an embodiment of this application;

[0025] Figure 2 Exploded structural diagram of a single cell according to an embodiment of this application;

[0026] Figure 3 Partial exploded sectional structural diagram of a single cell according to an embodiment of this application;

[0027] Figure 4 Partial sectional structural diagram of a single cell before the core is separated according to an embodiment of this application;

[0028] Figure 5 Partial sectional structural diagram of a single cell after the core is separated according to an embodiment of this application;

[0029] Figure 6 Axonometric structural diagram of a connector according to an embodiment of this application;

[0030] Figure 7 Axonometric structural diagram of a connector according to another embodiment of this application;

[0031] Figure 8 Axonometric structural diagram of a connector according to yet another embodiment of this application;

[0032] Figure 9 Partial structural diagram of a single cell according to an embodiment of this application;

[0033] Figure 10 Axonometric structural diagram of a connector according to still another embodiment of this application;

[0034] Figure 11 Partial exploded sectional structural diagram of a single cell according to another embodiment of this application.

[0035] Explanation of reference numerals:

[0036] 100, single cell; 100a, accommodation space;

[0037] 110, battery cell;

[0038] 111, tab;

[0039] 120, housing;

[0040] 130, terminal;

[0041] 130a, Avoidance through-hole;

[0042] 130aa, First through-hole; 130ab, Second through-hole; 130ac, Third through-hole;

[0043] 140, Connector;

[0044] 141, Connection body;

[0045] 1411, First connection part; 1412, Second connection part; 1413, Lapping part;

[0046] 142, Core body;

[0047] 143, Fracture part; [[ID=2]]

[0048] 150, Discharge channel plate

[0049] 160, Explosion-proof valve;

[0050] X, First direction; Y, Second direction; Z, Third direction.

[0051] Through the above-mentioned drawings, the specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Specific embodiments

[0052] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0053] The single battery 100 of the embodiments of the present application may include a lithium-ion secondary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, etc. The single battery 100 of the embodiments of the present application may be a solid-state battery or a semi-solid-state battery. It is not limited in the present application. The single battery 100 can generally be divided into a square battery and a soft-pack battery according to the packaging method. It is not limited in the present application.

[0054] Multiple single batteries 100 of the present application can be connected in series to form a battery module, so as to provide energy for devices such as vehicles, ships, and small aircraft. Taking a vehicle as an example, the vehicle of the present application can be a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle.

[0055] The single cell 100 can be used as the driving power source of an automobile, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle. Exemplarily, the single cell 100 can supply electrical energy to the drive motor. The drive motor is connected to the wheels on the vehicle through a transmission mechanism to drive the vehicle forward. Specifically, the battery module formed by connecting multiple single cells 100 in series can be horizontally arranged at the bottom of the vehicle.

[0056] The single cell 100 includes an electrode assembly 110. The electrode assembly 110 includes a positive electrode plate, a separator, and a negative electrode plate. The positive electrode plate, the separator, and the negative electrode plate can be formed into a wound electrode assembly by a winding processing technique. Alternatively, the positive electrode plate, the separator, the negative electrode plate, and the separator can also be stacked in sequence to form a stacked electrode assembly. Alternatively, the positive electrode plate, the separator, and the negative electrode plate can be formed into the electrode assembly in a form combining the winding process and the stacking process.

[0057] Taking the single cell 100 being a lithium-ion battery as an example. The single cell 100 mainly relies on the movement of lithium ions between the positive electrode plate and the negative electrode plate for charging and discharging. During the charging process of the single cell 100, lithium ions are deintercalated from the positive electrode plate and then embedded into the negative electrode plate after passing through the separator.

[0058] The single cell 100 further includes a housing 120 and a terminal 130. The terminal 130 can be arranged at one end of the housing 120. The terminal 130 can be used to connect to an external circuit. The housing 120 and the terminal 130 can form a receiving space 100a for receiving the electrode assembly 110. The housing 120 can function to protect the electrode assembly 110. Taking the stacked electrode assembly as an example, one end of the electrode assembly 110 can lead out multiple electrode plates with the same polarity. The multiple electrode plates can be connected to each other to form a tab 111. The tab 111 is electrically connected to the terminal 130 inside the single cell 100.

[0059] The applicant has found that in the related art, after the multiple electrode plates form the tab, it can occupy a part of the internal space of the single cell, and the tab is connected to the terminal inside the single cell. Therefore, the tab will occupy a part of the receiving space, so that the size of the electrode assembly in the receiving space is limited, which easily leads to the phenomenon of reduced energy density of the single cell.

[0060] Based on the above problems, the applicant has improved the structure of the single cell 100. In this application, an avoidance through hole 130a is provided on the terminal 130. A part of the tab 111 can be located inside the avoidance through hole 130a to reduce the tab 111 from occupying the internal space of the housing 120, which is beneficial to increasing the size of the electrode assembly 11, and thus beneficial to increasing the energy density of the single cell 100.

[0061] The following further describes the single cell 100 provided in this application with specific embodiments.

[0062] In some feasible ways, seeFigures 1 to 6 As shown, the single cell 100 of the embodiment of the present application includes a battery cell 110, a housing 120, a terminal 130, and a connecting member 140.

[0063] The battery cell 110 includes tabs 111. The battery cell 110 may be located in the housing 120. Along the first direction X, the terminal 130 is disposed at an end of the housing 120. The terminal 130 is provided with an avoidance through hole 130a. The avoidance through hole 130a penetrates the terminal 130. Part of the tabs 111 is located in the avoidance through hole 130a. The terminal 130 is electrically connected to the tabs 111.

[0064] The connecting member 140 includes a connected connection body 141 and a core body 142. Both the tabs 111 and the terminal 130 are connected to the connection body 141. The connection body 141 is located in the avoidance through hole 130a. Part of the core body 142 is located on a side of the terminal 130 facing away from the battery cell 110. The core body 142 can be separated from the connection body 141 under force.

[0065] The housing 120 and the terminal 130 of the embodiment of the present application can form a receiving space 100a. The battery cell 110 can be located in the receiving space 100a. Part of the tabs 111 led out from one end of the battery cell 110 can be located inside the avoidance through hole 130a of the terminal 130, so as to reduce the possibility that the tabs 111 occupy the receiving space 100a and affect the size of the battery cell 110, which is beneficial to improving the energy density of the single cell 100.

[0066] See Figures 3 to 5 As shown, since the tabs 111 are connected to the connecting member 140, during the assembly process of the tabs 111 and the terminal 130, the assembler can pass the connecting member 140 through the avoidance through hole 130a, so that part of the core body 142 can be located outside the terminal 130. Then, the assembler can grasp the exposed core body 142 from the outside of the terminal 130 through mechanical equipment. Secondly, the assembler can apply a force to the core body 142 in a direction away from the battery cell 110, so that the tabs 111 can be located inside the avoidance through hole 130a, and the tabs 111 can be tightly connected to the inner wall of the avoidance through hole 130a. Thirdly, the assembler can apply a greater force to the core body 142, so that the core body 142 can be separated from the connection body 141, to reduce the possibility that the core body 142 is exposed outside the terminal 130 and affects the electrical connection between the single cells 100. Finally, the outer surface of the terminal 130 is sealed, so as to realize the fixed connection between the tabs 111 and the terminal 130.

[0067] In some examples, the sealing method for the outer surface of the terminal 130 may be welding or bonding. It is not limited in the present application.

[0068] In some examples, the present application takes the single cell 100 being a square single cell as an example to illustrate the specific implementation manners. The first direction X can be the length direction of the single cell 100.

[0069] In some implementable manners, referring to Figures 5 to 8 as shown, the connecting member 140 of the embodiment of the present application includes a breaking portion 143. Along the first direction X, the breaking portion 143 is located between the connecting body 141 and the core 142. The breaking portion 143 is located within the avoidance through hole 130a.

[0070] The breaking portion 143 can be a weak area on the connecting member 140, that is, an area prone to breakage. When a force acting away from the battery cell is applied to the core 142 of the connecting member 140, the connecting member 140 can be disconnected at the breaking portion 143 to form an independent connecting body 141 and core 142.

[0071] In some examples, the strength of the material of the breaking portion 143 can be weaker than the strength of the material of the connecting body 141 and also weaker than the strength of the material of the core 142, so that when the core 142 is stressed, the connecting member 140 can break at the breaking portion 143.

[0072] Or, referring to Figure 7 and Figure 8 as shown, the breaking portion 143 can be provided with a structure prone to breakage, so that when the core 142 is stressed, the connecting member 140 can break at the breaking portion 143. For example, grooves or a plurality of holes can be provided on the breaking portion 143.

[0073] In some implementable manners, referring to Figure 5 and Figure 6 as shown, the connecting body 141 of the embodiment of the present application includes a first connecting portion 1411 and a second connecting portion 1412. The first connecting portion 1411 is located within the tab 111. The second connecting portion 1412 is located within the avoidance through hole 130a. Along the first direction X, the second connecting portion 1412 is located between the first connecting portion 1411 and the breaking portion 143.

[0074] The first connecting portion 1411 and the second connecting portion 1412 of the embodiment of the present application are connected. The first connecting portion 1411 can be used to connect the tab 111 and the second connecting portion 1412. The first connecting portion 1411 can be located inside the tab 111 to make full contact with the tab 111.

[0075] In some implementable manners, referring to Figure 5 and Figure 6As shown, the connection body 141 of the embodiment of the present application further includes a lapping portion 1413. The lapping portion 1413 is located in the avoidance through hole 130a. Along the first direction X, the lapping portion 1413 is located between the first connection portion 1411 and the second connection portion 1412. One end of the lapping portion 1413 facing the first connection portion 1411 is connected to the tab 111.

[0076] The end face of the lapping portion 1413 facing the battery cell 110 can be connected to the tab 111 to increase the contact area between the connecting member 140 and the tab 111, thereby facilitating the improvement of the connection stability between the connecting member 140 and the tab 111.

[0077] The lapping portion 1413 of the embodiment of the present application can connect the first connection portion 1411 and the second connection portion 1412. The lapping portion 1413 can be connected to the inner wall of the avoidance through hole 130a. Thus, the tab 111 can be directly connected to the pole column 130 to achieve electrical conduction between the two. At the same time, the tab 111 can also achieve electrical conduction with the pole column 130 through the lapping portion 1413 and the second connection portion 1412 to increase the contact area of electrical conduction between the tab 111 and the pole column 130.

[0078] In some implementable ways, refer to Figure 3 and Figure 5 As shown, the avoidance through hole 130a of the embodiment of the present application includes a first through hole 130aa, a second through hole 130ab, and a third through hole 130ac that are connected and communicate with each other. Along the first direction X, the second through hole 130ab is located between the first through hole 130aa and the third through hole 130ac. Part of the tab 111 and the lapping portion 1413 are located in the first through hole 130aa. The second connection portion 1412 and the fracture portion 143 are located in the second through hole 130ab. The core body 142 passes through the third through hole 130ac. Part of the core body 142 is located on the side of the pole column 130 facing away from the second connection portion 1412.

[0079] The avoidance through hole 130a can penetrate the pole column 130 along the first direction X. The first through hole 130aa can be used to accommodate the tab 111. The outer side wall of the tab 111 located in the first through hole 130aa can be connected to the inner wall of the first through hole 130aa. The lapping portion 1413 is located in the first through hole 130aa. A part of the lapping portion 1413 can be connected to the tab 111, and another part can be connected to the pole column 130.

[0080] The second through hole 130ab can be used to accommodate the second connection portion 1412 and the fracture portion 143. The core body 142 can pass through the third through hole 130ac to the outside of the pole column 130.

[0081] In some implementable ways, refer to Figures 3 to 5As shown, the first connecting portion 1411 of the embodiment of the present application can be inserted into the end face of the tab 111 facing away from the battery cell 110. The end face of the tab 111 facing away from the battery cell 110 is connected to the overlapping portion 1413.

[0082] The tab 111 can be formed by stacking a plurality of positive or negative plates. The first connecting portion 1411 can be inserted into the side of the tab 111 facing the terminal 130. The first connecting portion 1411 can be in full contact with the tab 111 so that the connecting member 140 can be tightly connected to the tab 111.

[0083] In some examples, the connecting member 140 can be first inserted into the tab 111; then, the overlapping portion 1413 can be connected to the tab 111 by using a welding process; again, the end of the connecting member 140 facing away from the battery cell 110 can be passed through the avoidance through hole 130a so that a part of the core body 142 can be exposed.

[0084] In some implementable ways, referring to Figure 5 and Figure 6 As shown, along the second direction Y, the size of either the connecting body 141 or the core body 142 is greater than the size of the fracture portion 143. The size of either the first connecting portion 1411 or the second connecting portion 1412 is less than the size of the overlapping portion 1413. The second direction Y of the present application can be the thickness direction of the single cell 100.

[0085] Along the second direction Y, the size of the fracture portion 143 on the connecting member 140 can be the smallest. When a force in the direction away from the battery cell 110 is applied to the end of the core body 142 away from the first connecting portion 1411 on the connecting member 140, the fracture portion 143 of the connecting member 140 breaks, so that the core body 142 and the connecting body 141 are separated. After fracture, at least a part of the fracture portion 143 can still be connected to the core body 142. That is, the fracture portion 143 can fall off together with the core body 142.

[0086] It should be noted that, referring to Figure 9 As shown, after the core body 142 is separated from the connecting body 141, the second through hole 130ab needs to be sealed. For example, when using a welding process to seal the second through hole 130ab, the second connecting portion 1412 located in the second through hole 130ab can also be connected to the terminal 130, and at the same time, the second through hole 130ab is blocked.

[0087] Both the overlapping portion 1413 and the first connecting portion 1411 are connected to the tab 111. Along the second direction Y, the size of the overlapping portion 1413 can be the same as the size of the tab 111 located in the first through hole 130aa, so that the opposite surfaces of the two can be in full contact, thereby improving the connection tightness between the tab 111 and the connecting member 140.

[0088] Along the second direction Y, the size of the overlapping portion 1413 on the connecting member 140 can be the largest. Correspondingly, along the second direction Y, the size of the first through hole 130aa can be larger than that of the second through hole 130ab. A transition end face is provided between the inner wall of the first through hole 130aa and the inner wall of the second through hole 130ab. The transition end face faces the battery cell 110. When one end of the core body 142 away from the first connecting portion 1411 is subjected to a force in the direction away from the battery cell 110, the end face of the overlapping portion 1413 facing away from the battery cell 110 can abut against the transition end face. The transition end face can prevent the overlapping portion 1413 from moving in the direction away from the battery cell 110, thereby reducing the possibility of separation between the first connecting portion 1411 and the tab 111.

[0089] In some implementable ways, the cross-sectional shape of the tab 111 located in the first through hole 130aa matches the cross-sectional shape of the first through hole 130aa. The cross-section is perpendicular to the first direction X.

[0090] In some examples, the cross-sectional shape of the tab 111 located in the first through hole 130aa can be strip-shaped. The short side can be arranged along the second direction Y. The long side can be arranged along the third direction Z to increase the connection area between the tab 111 and the terminal 130. The third direction Z can be the width direction of the single battery cell 100. The first direction X, the second direction Y, and the third direction Z can be perpendicular to each other.

[0091] The matching of the cross-sectional shape of the tab 111 in the first through hole 130aa of the embodiment of the present application with the cross-sectional shape of the first through hole 130aa can reduce the possibility of the tab 111 sliding along the third direction Z in the first through hole 130aa.

[0092] In some implementable ways, referring to Figure 6 as shown, the cross-sectional shape of the overlapping portion 1413 matches the cross-sectional shape of the first through hole 130aa, and the cross-section is perpendicular to the first direction X.

[0093] In some examples, the cross-sectional shape of the overlapping portion 1413 can be strip-shaped. The short side in the cross-sectional shape of the overlapping portion 1413 can be arranged along the second direction Y. The long side can be arranged along the third direction Z to increase the connection area between the overlapping portion 1413 and the tab 111 and the terminal 130. The matching of the cross-sectional shape of the overlapping portion 1413 with the cross-sectional shape of the first through hole 130aa can reduce the possibility of the overlapping portion 1413 sliding along the third direction Z in the first through hole 130aa.

[0094] In some implementable ways, referring to Figure 6 as shown, the cross-sectional shape of the second connecting portion 1412 matches the cross-sectional shape of the second through hole 130ab, and the cross-section is perpendicular to the first direction X.

[0095] In some examples, the cross-sectional shape of the second connecting portion 1412 may be elongated. The short side of the cross-sectional shape of the second connecting portion 1412 may be arranged along the second direction Y. The long side may be arranged along the third direction Z to increase the connection area between the second connecting portion 1412 and the overlapping portion 1413 and the pole column 130. Matching the cross-sectional shape of the second connecting portion 1412 with the cross-sectional shape of the second through hole 130ab can reduce the possibility of the second connecting portion 1412 sliding along the third direction Z within the second through hole 130ab.

[0096] In some realizable ways, the number of the connecting members 140 is multiple. The multiple connecting members 140 are arranged at intervals along the third direction Z.

[0097] In some examples, referring to Figure 10 As shown, the connecting member 140 may also be a columnar structure. The multiple connecting members 140 may be arranged at intervals along the third direction Z, and the distance between two adjacent connecting members 140 may be the same.

[0098] In some examples, multiple connecting members 140 may be connected to the tab 111 in sequence first; then the ends of the multiple connecting members 140 facing away from the battery cell 110 are passed through the avoidance through holes 130a in sequence, so that the respective part of the core body 142 of each connecting member 140 can be exposed. It should be noted that after the core body 142 of each connecting member 140 is separated, the second through hole 130ab of the pole column 130 needs to be sealed.

[0099] In some realizable ways, the tab 111 is connected to the connection body 141. Referring to Figure 11 As shown, the tab 111 and the connecting member 140 may be an integral structure.

[0100] In some examples, the tab 111 and the connecting member 140 may be an integral structure. It can be understood that the tab 111 led out from one end of the battery cell 110 may include the structure of the connecting member 140, that is, the connecting member 140 may be a part of the tab 111, thereby omitting the welding process between the connecting member 140 and the tab 111, which is beneficial to improving the assembly efficiency of the single battery 100.

[0101] The embodiment of the present application further provides a vehicle, and the vehicle includes the single battery 100 of the above embodiment. The number of the single batteries 100 is multiple. The multiple single batteries 100 may be connected in series with each other.

[0102] In some realizable ways, the single cell 100 may include two terminal posts 130. Along the first direction X, the two terminal posts 130 may be respectively disposed at two ends of the housing 120. Both the housing 120 and the terminal posts 130 may be made of conductive metal materials. The housing 120 and the terminal posts 130 may be insulatingly connected. The housing 120 may have a relatively high strength to reduce the possibility that the housing 120 of the single cell 100 is punctured during handling or transportation, damaging the battery cell 110.

[0103] In some examples, the single cell 100 may further include a discharge channel plate 150 and an explosion-proof valve 160. The discharge channel plate 150 may be located inside the housing 120. The explosion-proof valve 160 may be located outside the housing 120. The discharge channel plate 150 and the explosion-proof valve 160 may be correspondingly arranged. The discharge channel plate 150 may be used to support the battery cell 110, so that there may be a gap between the battery cell 110 and the inner wall of the housing 120. Thus, when an abnormality occurs in the single cell 100, the battery cell 110 is not likely to block the explosion-proof valve 160, resulting in the failure of the explosion-proof valve 160.

[0104] Exemplarily, the material of the housing 120 may be aluminum, aluminum alloy, steel or stainless steel, etc. The material of the terminal post 130 may be aluminum. It is not limited in this application.

[0105] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, or an indirect connection through an intermediate medium, or the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0106] The device or element referred to in the embodiments of the present application or implied must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "a plurality" is two or more, unless otherwise precisely and specifically defined.

[0107] The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims and the above drawings of the embodiments of the present application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such used data may be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0108] In addition, the terms "comprise" and "include" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these process, method, product or apparatus.

[0109] As used herein, the term "plurality" refers to two or more. The term "and / or" herein is merely a description of an associated relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after; in a formula, the character " / " represents a "division" relationship between the associated objects before and after.

[0110] It should be understood that the various numerical numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application.

[0111] It should be understood that in the embodiments of the present application, the magnitude of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

Claims

1. A single cell, characterized in that, Comprising: a battery cell including tab; a housing in which the battery cell is located; a terminal post disposed at an end of the housing along a first direction, the terminal post being provided with an avoidance through-hole that penetrates the terminal post, and part of the tab being located in the avoidance through-hole, the terminal post being electrically connected to the tab; a connecting member including a connected connection body and a core body, both the tab and the terminal post being connected to the connection body, the connection body being located in the avoidance through-hole, and part of the core body being located on a side of the terminal post facing away from the battery cell, and the core body can be separated from the connection body under force; the connecting member includes a fracture portion, and along the first direction, the fracture portion is located between the connection body and the core body, and the fracture portion is located in the avoidance through-hole; the connection body includes a first connection portion and a second connection portion, the first connection portion is located in the tab, the second connection portion is located in the avoidance through-hole, and along the first direction, the second connection portion is located between the first connection portion and the fracture portion; 2. The single cell according to claim 1, characterized in that, the connection body further includes a lapping portion, the lapping portion is located in the avoidance through-hole, and along the first direction, the lapping portion is located between the first connection portion and the second connection portion, and one end of the lapping portion facing the first connection portion is connected to the tab; 3. The single cell according to claim 2, wherein the avoidance through-hole includes a first through-hole, a second through-hole and a third through-hole that are communicated with each other, along the first direction, the second through-hole is located between the first through-hole and the third through-hole, part of the tab and the lapping portion are located in the first through-hole, the second connection portion and the fracture portion are located in the second through-hole, the core body passes through the third through-hole, and part of the core body is located on a side of the terminal post facing away from the second connection portion; 4. The single cell according to claim 2, wherein the first connection portion is inserted into an end face of the tab facing away from the battery cell, and the end face is connected to the lapping portion; 5. The single cell according to claim 2, characterized in that, along a second direction, the size of either the connection body or the core body is greater than the size of the fracture portion, and the size of either the first connection portion or the second connection portion is less than the size of the lapping portion; 6. The single cell according to claim 3, characterized in that, the cross-sectional shape of the tab located in the first through-hole matches the cross-sectional shape of the first through-hole, and the cross-section is perpendicular to the first direction; and / or, the cross-sectional shape of the lapping portion matches the cross-sectional shape of the first through-hole, and the cross-section is perpendicular to the first direction; and / or, the cross-sectional shape of the second connection portion matches the cross-sectional shape of the second through-hole, and the cross-section is perpendicular to the first direction; 7. The single cell according to claim 1, characterized in that, the number of the connecting members is multiple, and the multiple connecting members are arranged at intervals along a third direction; alternatively, the tab is connected to the connection body, and the tab and the connecting member are of an integral structure; 8. A vehicle, characterized in that, including the single battery according to any one of claims 1 to 7, the number of the single batteries is multiple, and the multiple single batteries are connected in series with each other.

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