Battery pack including a cell pack and a battery management system

Abstract

Battery pack comprising a cell pack and a battery management system. Battery pack, comprising a cell pack (4), each cell having two opposite polarities, each polarity being electrically coupled to a first connector (57) located at the right of a first cooperation portion (47), the system comprising an electronic management box (5) configured to be removably mounted on the cell pack (4) and comprising, second connectors (67) electrically coupled to a battery management system (6) and located at the right of second cooperation portions (77), the battery pack being configured so that the mounting of the box (5) on the cell pack (4) causes a mechanical cooperation of each first cooperation portion (47) with one of the second cooperation portions (77) operating in a sealed manner while electrically coupling each first connector (57) with a second connector (67).Figure for the abridged version: Fig.7.

Description

Title of the invention: Battery pack comprising a cell pack and a battery management system technical field

[0001] The present invention relates to battery packs comprising a cell pack and a battery management system, in particular an electronic battery pack management board. STATE OF THE ART

[0002] The field of batteries powering power tools has been constantly evolving for the past twenty years. Initially, batteries powered tools requiring relatively low power (electric pruners, tying tools, etc.), providing them with several hours of professional operating time, with the batteries then being recharged overnight. However, the energy and power requirements for the operation of such tools have increased significantly, now powering brush cutters, chainsaws, and so on. The power requirements of these tools have been met by the development of backpack batteries to provide the necessary autonomy and power for several hours, these characteristics being directly proportional to the weight of the battery's active electrochemical materials.In this case, a battery with a significant energy capacity can easily supply power to the tool while delivering only a relatively low current, ensuring a long battery life. New generations of active battery materials now allow for high current delivery despite reduced battery life and weight. This enables the development of a battery pack integrated into the tool, comprising a cell pack (i.e., a package that electrically connects several cells in series and / or parallel via their positive and negative terminals). Such battery packs can then power high-power tools without a power cord connected to a backpack battery, allowing for several minutes of runtime or even a few hours when used at low power.Several hours of autonomy can also be ensured by having multiple battery packs connected successively to the tool as soon as the previous pack is discharged. Discharged battery packs can also be quickly charged in parallel. However, these onboard battery packs must be sufficiently lightweight to allow for easy handling of the tool without causing significant musculoskeletal disorders for the user.

[0003] High power supplied by the battery pack to the tool means the presence of high currents, which, however, induces significant thermal stress on the cells through all conductors, both external and internal to the cells. The heat dissipated is indeed proportional to the square of the current flowing through these conductors. High currents and temperatures then accelerate the aging of the internal electrodes of the cells, reducing their lifespan. While cells of a battery technology can achieve several thousand charge / discharge cycles with low operating currents (this is the case, for example, with lithium-ion or even lithium iron phosphate (LiFePO4) battery technologies), rapid charge / discharge operation with high currents limits their lifespan to a few hundred charge / discharge cycles.

[0004] Battery packs composed of high-performance cells require electronic management of each cell. The electronic management board is generally called a BMS (or "Battery Management System"). The electronic components of the battery pack's BMS are much more tolerant of these high temperatures and currents and therefore have a much longer lifespan than the cells themselves. Thus, it is not necessary to recycle the BMS of such a battery at the same time as the associated cell pack. However, the associated BMSs of these battery packs are integrated very closely, or even inside, the cell pack in such a way that it is impossible to separate the BMS from the cell pack without causing irreversible damage to the BMS. Therefore, there is a real problem related to the recycling of end-of-life battery packs: the need to recycle their still-functional BMS at the same time..

[0005] Indeed, the design of such batteries, due to the high currents during charging or discharging, requires a minimum internal resistance in the various conductors as well as in the interconnections (connectors, solder joints, etc.) between the BMS and the cells to limit heating in all these resistive parts. The BMS is therefore generally soldered directly onto the connections with the cells constituting the battery pack, which makes it extremely difficult to separate the BMS from the cell pack during recycling and then reuse it by combining it with a new cell pack without damaging it.

[0006] At the end of the battery pack's life, or even when a cell failure is detected, it would be advantageous to be able to replace only the cell pack while retaining the BMS in order to limit the environmental impact of recycling. Under these conditions, the same BMS could be reused many times before it itself needs to be recycled.

[0007] This requires, in fact, taking into account various aspects in the implementation of such a BMS so that it can be recovered quickly and without damage at the end of The lifespan of the cell pack is reduced so that it can be assembled onto a new cell pack. Existing BMSs are connected to the cell pack, generally by a multitude of conductors: measurement conductors in wire form for measuring voltages or temperatures, or power conductors in the form of conductive ribbons (commonly called "tabs") to carry the current from these cells to the tool. These wires or ribbons are soldered between the cells or sensors and the BMS. Some connections to the BMS can be made with multiple connectors adapted to each interconnection of wires or ribbons. However, this represents a significant volume and involves the presence of intermediate metal contacts that must be crimped or soldered. The metals of these contacts are often different from the materials being connected, generating additional heat.Cooling the cells during operation, for example with air, also requires ensuring sufficient sealing at the various contacts in each connection between the BMS and the cell pack to prevent degradation, particularly through corrosion or, at the very least, a significant increase in contact resistance. This level of sealing is often shifted to the battery pack itself, to the detriment of the battery pack's long-term reliability, due to the complexity of achieving a seal around the contacts in the connections between the BMS and the cell pack.

[0008] Power conductors, or tabs, connect the positive and negative terminals of the cells in a series / parallel architecture so as to define, between the positive and negative terminals of the battery pack, a voltage equal to the individual voltage of a single cell multiplied by the number of cells connected in series, and to define a battery pack capacity (the unit of which is the Ampere-hour, denoted Ah) equal to the capacity of a single cell multiplied by the number of cells connected in parallel. Such power conductors are formed from strips of stainless conductive metal (such as nickel, for example) or coated with a stainless coating (nickel-plated steel, for example). They are often configured to be welded at each pole using an appropriate welding technology (spot welding, laser welding, tin soldering, etc.), with the two end poles then being connected to the BMS, for example, with tin solder.

[0009] Measuring conductors have, among other functions, the function of taking voltage measurements as close as possible to the poles of each cell in series to reflect the cell voltage during charging, discharging, or rest phases. Such conductors are often made of small-diameter insulated conducting wires. When there are, for example, N cells connected in series, there is a need to position at least N + 1 wires to ensure the voltage measurement of each cell between its positive and negative poles. However, these small-diameter wires are fragile and often delicate to Position them within the battery pack, taking into account the pack's volume constraints. Friction or pinching can damage their insulation and cause a short circuit in the battery.

[0010] For example, all the battery pack connectors (power or measurement conductors) can be isolated from the airflow or cooling fluid of the battery pack cells. This prevents weakening of the various power or measurement circuit connections, particularly through corrosion or dust accumulation, thus avoiding the risk of short circuits or a significant increase in contact resistance, which can generate unwanted heating and reduce cell lifespan. However, the number and nature of the connections to be isolated make this process complex and do not facilitate damage-free removal of the BMS at the end of the cell pack's life.

[0011] In order to increase the lifespan of the cell pack, efficient and homogeneous cooling of the individual cells can also be ensured by the passage of air, or a cooling fluid, around the cell to dissipate the heat generated during charging or discharging, while maintaining a small temperature difference between each cell. However, in this case, disturbances arising from the positioning of the BMS within the battery pack must be minimized to avoid disrupting the homogeneity of this cooling. Indeed, as soon as a single cell fails, for example, exhibiting faster aging than the other cells due to poorly balanced thermal management, the entire cell pack must be replaced.

[0012] For example, patent application DE102013220119 discloses a battery housing comprising a base housing, which is arranged to receive at least one battery cell, a housing cover, which is arranged to be connected to the base housing, and battery electronics mounted on an inner side of the housing cover. The housing cover has a plurality of screw holes arranged along its periphery for attaching the cover to the base housing by means of mounting screws. Furthermore, the battery cells are electrically connected to the battery electronics by connecting screws linking contact elements to connecting rails. Such a battery housing requires the use of several screws and specific tools, making the assembly or disassembly of the unit lengthy and tedious.Furthermore, the unit does not allow measurement of the voltage across the cells; it only reveals the two terminals of the cell assembly exiting the base unit and connected in a removable manner by a mechanical assembly between the base unit and the battery electronics.

[0013] An object of the present invention is therefore to propose a solution to overcome the aforementioned drawbacks, and in particular, to propose means to improve the thermal, electrical and electronic safety of a battery pack comprising a cell pack and a BMS, while facilitating tool-free connections and disconnections between the BMS and the cell pack.

[0014] The other objects, features and advantages of the present invention will become apparent from an examination of the following description and accompanying drawings. It is understood that other advantages may be incorporated. SUMMARY

[0015] To achieve this objective, a battery pack is proposed, comprising a cell pack including at least two electrically coupled cells in series, each cell having two opposite polarities, each polarity being electrically coupled to a first connector via at least one conductive connection, the cell pack including first cooperation portions associated with the first connectors, each first connector being located at the right of a first cooperation portion.

[0016] The battery pack includes an electronic management unit configured to be removably mounted on the cell pack and to house at least one battery management system, denoted BMS, the BMS comprising a measurement circuit configured to measure parameters relating to cell voltages, and:

[0017] - the electronic control unit includes second coupled connectors electrically to the BMS, and second cooperation sections, each second connector being located at the right of a second cooperation section, and

[0018] - the battery pack is configured so that the mounting of the management box electronics on the cell pack causes mechanical cooperation of each first cooperation portion with one of the second cooperation portions, the mechanical cooperation of each first cooperation portion with one of the second cooperation portions operating in a sealed manner while electrically coupling each first connector with a second connector.

[0019] Thus, the electronic control unit is made removable to, in particular, facilitate the recycling of the BMS it contains. Furthermore, when the electronic control unit is mounted on the cell pack and the latter requires air circulation around the cells for cooling, the sealed mechanical connection between each first section of the unit and one of the second sections of the unit limits corrosion of the electrical connections between the cell pack and the BMS. A key effect is to facilitate the damage-free mounting and dismounting of the electronic control unit, including during recycling operations, so that it, or at least the BMS it contains, can be reused, while significantly limiting contact corrosion and the increase in contact resistance inherent in battery aging.Thus, the same BMS can be connected to both cylindrical and prismatic cell packs, each cell pack having . with its own voltage characteristics and, moreover, including initial cooperation sections compatible with the subsequent cooperation sections of the electronic management unit. In other words, the electronic management unit can be quickly separated from the cell pack to facilitate cell recycling without damaging the BMS, which retains its functionality for use with a new cell pack.

[0020] The sealing function of the various contacts in the connections between the BMS and the cell pack refers to a seal that limits the passage of the cell cooling fluid at the contacts, thereby limiting corrosion of these contacts and thus an increase in contact resistance due to abnormal and unwanted circulation of this cooling fluid around the contacts. For example, in the case of an air-cooled cell pack requiring openings in the battery pack to allow air circulation, the sealing also covers the use of this pack in rainy weather where water splashes may occur at the contacts. BRIEF DESCRIPTION OF THE FIGURES

[0021] The aims, objects, features and advantages of the invention will become clearer from the detailed description of an embodiment thereof, which is illustrated by the following accompanying drawings in which:

[0022] [Fig. 1] The [Fig. 1] represents a perspective view of an embodiment of a battery pack having a visible connector side.

[0023] [Fig.2] Fig.2 represents a perspective view of the battery pack of Fig.1, showing one side of a visible display interface.

[0024] [Fig.3] Fig.3 represents a view of the contents of a first embodiment of the battery pack of figures 1 and 2, including a cylindrical cell pack assembled with its electronic management unit.

[0025] [Fig.4] The [Fig.4] represents the electronic management unit of the [Fig.3] disassembled from the cell pack.

[0026] [Fig.5] The [Fig.5] represents a perspective view of the electronic control unit from the side of its connection with the cell pack and with a tool connector.

[0027] [Fig.6] Fig.6 represents another view of the electronic control unit of Fig.5 without the tool connector.

[0028] [Fig.7] The [Fig.7] schematically represents a section of the battery pack of the [Fig.1], showing a connection of first measuring connectors to a cell.

[0029] [Fig. 8] [Fig. 8] schematically represents a partial section of the cell pack and electronic management unit of [Fig. 3], comprising the first and second connectors and showing a junction of the first and second portions of cooperation.

[0030] [Fig.9] Fig.9 represents a view of the contents of a second embodiment of the battery pack in figures 1 and 2, including a prismatic cell pack disassembled with its electronic management unit.

[0031] The drawings are given by way of example and are not limiting of the invention. They constitute schematic representations of principle intended to facilitate understanding of the invention and are not necessarily to scale with practical applications. DETAILED DESCRIPTION

[0032] Before beginning a detailed review of embodiments and implementations of the invention, optional features which may possibly be used in association or alternatively are stated below.

[0033] For example, each first portion of cooperation is sealed and is crossed by a first connector.

[0034] For example, each second cooperation portion is sealed and is traversed by a second connector.

[0035] For example, one of the first and second cooperation portions forms a male portion, and the other of the first and second cooperation portions forms a female portion shaped to cooperate mechanically with the male portion.

[0036] For example, the first cooperation portions are arranged so that each first cooperation portion is located at the right of one of the second cooperation portions when the electronic management unit is mounted on the cell pack.

[0037] For example, the mechanical cooperation of each first portion of cooperation with one of the second portions of cooperation causes the electronic management unit to remain on the cell pack.

[0038] For example, the battery pack is configured so that the mounting of the electronic management unit on the cell pack is done manually, preferably without tools.

[0039] Figures 1 and 2 show an external view of a battery pack 1, generally prismatic in shape and comprising an outer casing, in the form of a shell 2 onto which a cover 3 is screwed, within which are housed a cell pack 4 and an electronic management unit 5 comprising a battery management system 6, denoted BMS, in the form of an electronic board for managing the cell pack 4. This battery pack is intended to be connected to a tool, not shown, via a tool connector 7, connected to the electronic control unit 5. The battery pack also includes a display interface 8 for the charge status of the cell pack, also connected to the electronic control unit. The cover 3 further includes ventilation slots 9 allowing airflow to cool the cells in the cell pack. Such slots may also be present on the housing 2 to enhance the cooling airflow.

[0040] Figures 3, 4, and 9 show in more detail the internal components of the battery pack 1, in particular the cell pack 4 and the electronic control unit 5. The cell pack 4 comprises at least two cells electrically connected in series. The cell pack 4 includes, for example, twelve individual electrochemical cells 40, 140 assembled here in a series architecture. One cell of the cell pack therefore corresponds here to one cell 40, 140. Indeed, it would be possible to arrange the twelve cells with another architecture, for example by connecting only six cells in series, the cell then comprising two cells connected in parallel; or even four cells in series, the cell then comprising three cells connected in parallel.According to an embodiment illustrated in Figures 3 and 4, the accumulators 40 of the cell pack 4 have a cylindrical shape and are, for example, Li-Ion (i.e., lithium-ion) batteries, commercially available in a standardized format such as 21700 or 18650. According to another embodiment, illustrated in [Fig. 9], the accumulators 140 of the cell pack 4 have a prismatic shape and can also be Li-Ion. Advantageously, a cover 141, preferably electrically insulating, is mounted on the accumulators 140 to hold them together. Each accumulator 40, 140 has two opposite polarities, namely a positive polarity P and a negative polarity N, arranged at each end of the cylindrical shape of the accumulator, as shown in [Fig. 7].Each cell in the cell pack, corresponding to one or more batteries connected in parallel, therefore has the same positive (P) and negative (N) polarities as the batteries, with the same voltage level as the batteries in the cell. As illustrated in Figures 3 and 4, the batteries are mechanically held between two flanges 42, 44 made of insulating material. These flanges are open at the cell ends to allow for operation and / or verification of the cell interconnections. The flanges are then covered with a waterproof membrane 50, such as an adhesive, providing a seal at the ends of each battery, thus allowing a flow of cooling air around most of their cylindrical side wall. Generally, each polarity of each cell is electrically coupled to a first... connectors 56, 57, 58 are connected via at least one conductive connection 52, 54, 151, for example, in the form of metal strips spot-welded to each cell polarity. For example, the conductive connections are sealed within the flanges 42, 44, or within the cover 141. The configuration of these conductive connections naturally depends on the series / parallel architecture chosen for the cell pack. For example, when the cell pack 4 comprises N cells connected in series, the cell pack 4 includes at least N+1 first connectors 57, known as measurement connectors, and at least N+1 conductive connections to ensure voltage measurement of each cell between their positive (P) and negative (N) polarities. Preferably, the cell pack 4 also includes two additional first connectors 56, 58, known as power connectors. Cell pack 4 includes initial cooperation portions 46, 47, 48.Preferably, the first cooperation sections 46, 47, 48 are electrically insulating. For example, in the embodiment illustrated in Figures 3 and 4, the flanges 42, 44 have the first cooperation sections 46, 47, 48 electrically insulating. In the embodiment illustrated in [Fig. 9], the cover 141 has the first cooperation sections 46, 47, 48. Advantageously, each first connector is located opposite a first cooperation section. Each first cooperation section is also said to be associated with a first connector. A first main connector 56, called the power connector, corresponds to the negative terminal of the cell pack, connected by a conductive connection to the negative polarity of the first cell in the series assembly. It is located opposite a first main cooperation section 46.A first secondary connector 58, called the power connector, corresponds to the positive terminal of the cell pack, connected by a conductive connection to the positive polarity of the last cell in the series assembly. It is located opposite a first secondary cooperation section 48. The first main and secondary connectors 56 and 58 are dedicated to power supply, have a larger cross-section, and are notably longer than the other first connectors 57, called measurement connectors, as illustrated in Figures 4, 8, and 9. For the twelve cells in series, thirteen first measurement connectors 57 allow the individual voltages of each cell to be measured. Each first measurement connector 57 is connected by a conductive connection to one of the polarities of a cell arranged in the series assembly. The first measurement connectors 57 are each located opposite one of the first cooperation sections 46, 47, and 48.The first 57 measuring connectors are dedicated to voltage measurement and do not require a large cross-section, as illustrated in Figures 4 and 9. The first connectors can also be formed from the same material, whether to define the positive terminals, negative terminals or voltage measurements; for example the first connectors are formed from a . The same metal ribbon is used. This limits the number of contact resistors required for conducting current or measuring voltage. Furthermore, they can be partially molded into the insulating material of the flanges 42, 44 or the cover 141 to ensure a watertight seal.

[0041] Furthermore, the battery pack 1 includes an electronic control unit 5 configured to be removably mounted on the cell pack 4, preferably without tools. That is to say, the electronic control unit 5 is movable between a connected position as illustrated in Figures 3, 7 and 8, in which the electronic control unit 5 is in contact with the cell pack 4 and corresponds to a position of the electronic control unit 5 and the cell pack 4 inside the battery pack 1; and a disconnected position as illustrated in Figures 4 and 9, in which the electronic control unit 5 is located away from the cell pack 4 in a position where the unit 5 is not in contact with the cell pack 4, and the unit 5 is outside the battery pack 1.More specifically, when the housing 5 transitions from the connected to the disconnected position, there is no mechanical damage to either the housing 5 or the cell pack 4. Furthermore, the housing 5 is configured to house the BMS 6 in the form of at least one electronic board. The BMS 6 comprises electronic circuits, at least one of which is configured to measure cell voltage parameters using each of the first connectors 57. It can be noted that the first power connectors 56 and 58 could replace two of the first measurement connectors 57 in the first cooperation sections 46 and 48, resulting in a smaller number of first measurement connectors 57 (namely eleven instead of thirteen in this example of twelve cells in series). However, the voltage measurement of the corresponding cells could be inaccurate when high currents flow through the first power connectors 56 and 58.

[0042] The electronic control unit 5 includes second connectors 66, 67, 68 electrically coupled to the BMS 6, for example via a measurement circuit integrated into the BMS. For example, a second connector 66, 67, 68 may include one or more contact pins, illustrated more particularly in Figures 6 to 8, configured to cooperate removably with a first connector 56, 57, 58.

[0043] The electronic control unit 5 comprises secondary cooperation portions 76, 77, 78, and each secondary connector 66, 67, 68 is located adjacent to a secondary cooperation portion 76, 77, 78. Preferably, the secondary cooperation portions are electrically insulating. For example, the electronic control unit 5 can be made of an electrically insulating material.

[0044] In particular, the battery pack 1 is configured so that mounting the electronic management unit 5 on the cell pack 4 causes, and preferably maintains, Mechanical cooperation between each first cooperation portion 46, 47, 48 and one of the second cooperation portions 76, 77, 78. This mechanical cooperation between each first cooperation portion 46, 47, 48 and one of the second cooperation portions 76, 77, 78 is achieved in a sealed manner, while electrically coupling each first connector 56, 57, 58 with a second connector 66, 67, 68. In other words, the mechanical cooperation between each first cooperation portion 46, 47, 48 and one of the second cooperation portions 76, 77, 78 seals the electrical coupling between the first and second connectors. The first 46, 47, 48 and second 76, 77, 78 cooperation portions can be cylindrical or oblong in shape.

[0045] For example, the first and second cooperation portions are sealed and allow the first 56, 57, 58 and second 66, 67, 68 connectors to pass through respectively, so that they can cooperate in a removable manner. In other words, the first and second connectors are visible when the electronic management unit 5 is in the disconnected position from the cell pack 4.

[0046] Thus, the seal between the electronic control unit 5 and the cell pack 4 is achieved by the connected position of the electronic control unit 5, i.e., mounting the electronic control unit 5 on the cell pack 4. The electronic control unit 5 can further cooperate with the cover 3 of the battery pack 1 by means of a seal 30. Thus, when the cell pack 4 is positioned in the casing 2, and the electronic control unit is assembled in a connected position, the cover 3 screwed onto the casing 2 cooperates via its seal 30 to maintain the assembly in the connected position, while also ensuring the seal of the BMS 6 contained in the electronic control unit. As illustrated in [Fig.[7] This assembly shows that the battery pack 1 can be cooled by an airflow circulating between the various ventilation slots 9 while protecting the BMS 6, the first 56, 57, 58 and second 66, 67, 68 connectors as well as the conductive connections 52, 54 from any dust that could cause short circuits or oxidation; while also ensuring air circulation around the accumulators 40 of the cell pack 4 to cool them. In other words, the second cooperation sections 76, 77, 78 are also conjugate with the first cooperation sections 46, 47, 78 in a sealed and removable manner, thus completing the sealing of the electrical and electronic connections between the P, N polarities of each accumulator 40 and the BMS.

[0047] Alternatively, the electronic control unit may include additional openings, not shown for the sake of simplification, for ventilation of the inside of the unit 5, in order to cool at least part of the BMS 6.

[0048] Advantageously, the battery pack 1 is configured so that the mounting of the electronic management box 5 on the cell pack 4 is carried out manually, preferably without tools.

[0049] The mechanical cooperation of each first cooperation portion 46, 47, 48 with one of the second cooperation portions 76, 77, 78 causes the electronic management unit 5 to remain on the cell pack 4. In other words, the mechanical cooperation causes the maintenance of mechanical contact between the electronic management unit 5 and the cell pack 4. For example, the first cooperation portions 46, 47, 48 are configured to be brought into contact with the second cooperation portions 76, 77, 78 by friction so as to keep the electronic management unit 5 in contact with the cell pack 4.

[0050] Advantageously, the first cooperation portions 46, 47, 48 are arranged so that each first cooperation portion 46, 47, 48 is located at the right of one of the second cooperation portions 76, 77, 78 when the electronic management box 5 is mounted on the cell pack 4.

[0051] For example, one of the first and second cooperation portions forms a male portion, and the other of the first and second cooperation portions forms a female portion shaped to cooperate mechanically with the male portion. According to the example illustrated in Figures 7 and 8, each first cooperation portion 46, 47, 48 forms a male part, for example, a protruding lug of the cell pack 4. In this case, each second cooperation portion 76, 77, 78 forms a female part, for example, a through or blind hole provided in a wall of the electronic management housing 5.

[0052] In addition, the electronic management unit 5 has a number of second cooperation portions 76, 77, 78 identical to the number of first cooperation portions 46, 47, 48 of the cell pack 4.

Claims

1. Demands Battery pack, including: - a cell pack (4) comprising at least two electrically connected cells in series, each cell having two opposite polarities (P, N), each polarity (P, N) being electrically connected to a first connector (56, 57, 58) via at least one conductive connection (52, 54), the cell pack (4) comprising first cooperation portions (46, 47, 48) associated with the first connectors (56, 57, 58), each first connector (56, 57, 58) being located at the right of a first cooperation portion (46, 47, 48), the battery pack including an electronic management unit (5) configured to be removably mounted on the cell pack (4) and to house at least one battery management system (6), denoted BMS, the BMS (6) comprising a measurement circuit configured to measure parameters relating to cell voltages,: - the electronic management unit (5) comprising second connectors (66, 67, 68) electrically coupled to the BMS (6), and second cooperation sections (76, 77, 78), each second connector (66, 67, 68) being located at the right of a second cooperation section (76, 77, 78), - the battery pack being configured so that the mounting of the electronic management unit (5) on the cell pack (4) causes a mechanical cooperation of each first cooperation portion (46, 47, 48) with one of the second cooperation portions (76, 77, 78), the mechanical cooperation of each first cooperation portion (46, 47, 48) with one of the second cooperation portions (76, 77, 78) operating in a sealed manner while electrically coupling each first connector (56, 57, 58) with a second connector (66, 67, 68), characterized in that one of the first and second cooperation portions (46, 47, 48; 76, 77, 78) forms a male portion, and the other of the first and second cooperation portions (46, 47, 48; 76, 77, 78) forms a female portion shaped to cooperate mechanically with the male portion.

2. Battery pack according to claim 1, wherein the first cooperation portions (46, 47, 48) are arranged so that each first cooperation portion (46, 47, 48) is located at the right of one of the second cooperation portions (76, 77, 78) when the electronic management unit (5) is mounted on the cell pack (4).

3. Battery pack according to any one of the preceding claims, wherein the first cooperation portions (46, 47, 48) are configured to be brought into contact, with the second cooperation portions (76, 77, 78), by friction such that the mechanical cooperation of each first cooperation portion (46, 47, 48) with one of the second cooperation portions (76, 77, 78) causes the electronic management unit (5) to remain on the cell pack (4).

4. Battery pack according to any one of the preceding claims, configured so that the mounting of the electronic management unit (5) on the cell pack (4) is carried out manually, preferably without tools.

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